Merge branch 'x86/apic' into x86-v28-for-linus-phase4-B

Conflicts:
	arch/x86/kernel/apic_32.c
	arch/x86/kernel/apic_64.c
	arch/x86/kernel/setup.c
	drivers/pci/intel-iommu.c
	include/asm-x86/cpufeature.h
	include/asm-x86/dma-mapping.h

86 files changed, 3635 insertions, 996 deletions

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index a2701cb6b37a..c5d891fd75e3 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -1424,6 +1424,12 @@ and is between 256 and 4096 characters. It is defined in the file
 
         nolapic_timer   [X86-32,APIC] Do not use the local APIC timer.
 
+        nox2apic        [X86-64,APIC] Do not enable x2APIC mode.
+
+        x2apic_phys     [X86-64,APIC] Use x2apic physical mode instead of
+                        default x2apic cluster mode on platforms
+                        supporting x2apic.
+
         noltlbs         [PPC] Do not use large page/tlb entries for kernel
                         lowmem mapping on PPC40x.
 
diff --git a/arch/um/sys-x86_64/syscall_table.c b/arch/um/sys-x86_64/syscall_table.c
index c128eb897008..32f5fbe2d0d2 100644
--- a/arch/um/sys-x86_64/syscall_table.c
+++ b/arch/um/sys-x86_64/syscall_table.c
@@ -41,12 +41,12 @@
 #define stub_rt_sigreturn sys_rt_sigreturn
 
 #define __SYSCALL(nr, sym) extern asmlinkage void sym(void) ;
-#undef _ASM_X86_64_UNISTD_H_
+#undef ASM_X86__UNISTD_64_H
 #include <asm-x86/unistd_64.h>
 
 #undef __SYSCALL
 #define __SYSCALL(nr, sym) [ nr ] = sym,
-#undef _ASM_X86_64_UNISTD_H_
+#undef ASM_X86__UNISTD_64_H
 
 typedef void (*sys_call_ptr_t)(void);
 
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 0d7cdbbfc1ee..44d4f2130d01 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -1689,6 +1689,14 @@ config DMAR_FLOPPY_WA
          workaround will setup a 1:1 mapping for the first
          16M to make floppy (an ISA device) work.
 
+config INTR_REMAP
+        bool "Support for Interrupt Remapping (EXPERIMENTAL)"
+        depends on X86_64 && X86_IO_APIC && PCI_MSI && ACPI && EXPERIMENTAL
+        help
+         Supports Interrupt remapping for IO-APIC and MSI devices.
+         To use x2apic mode in the CPU's which support x2APIC enhancements or
+         to support platforms with CPU's having > 8 bit APIC ID, say Y.
+
 source "drivers/pci/pcie/Kconfig"
 
 source "drivers/pci/Kconfig"
diff --git a/arch/x86/mach-es7000/Makefile b/arch/x86/es7000/Makefile
index 3ef8b43b62fc..3ef8b43b62fc 100644
--- a/arch/x86/mach-es7000/Makefile
+++ b/arch/x86/es7000/Makefile
diff --git a/arch/x86/mach-es7000/es7000.h b/arch/x86/es7000/es7000.h
index c8d5aa132fa0..4e62f6fa95b8 100644
--- a/arch/x86/mach-es7000/es7000.h
+++ b/arch/x86/es7000/es7000.h
@@ -1,7 +1,7 @@
 /*
  * Written by: Garry Forsgren, Unisys Corporation
  *             Natalie Protasevich, Unisys Corporation
- * This file contains the code to configure and interface 
+ * This file contains the code to configure and interface
  * with Unisys ES7000 series hardware system manager.
  *
  * Copyright (c) 2003 Unisys Corporation.  All Rights Reserved.
@@ -18,7 +18,7 @@
  * with this program; if not, write the Free Software Foundation, Inc., 59
  * Temple Place - Suite 330, Boston MA 02111-1307, USA.
  *
- * Contact information: Unisys Corporation, Township Line & Union Meeting 
+ * Contact information: Unisys Corporation, Township Line & Union Meeting
  * Roads-A, Unisys Way, Blue Bell, Pennsylvania, 19424, or:
  *
  * http://www.unisys.com
@@ -41,7 +41,7 @@
 #define MIP_VALID               0x0100000000000000ULL
 #define MIP_PORT(VALUE) ((VALUE >> 32) & 0xffff)
 
-#define MIP_RD_LO(VALUE)        (VALUE & 0xffffffff)   
+#define MIP_RD_LO(VALUE)        (VALUE & 0xffffffff)
 
 struct mip_reg_info {
         unsigned long long mip_info;
@@ -51,11 +51,11 @@ struct mip_reg_info {
 };
 
 struct part_info {
-        unsigned char type;   
+        unsigned char type;
         unsigned char length;
         unsigned char part_id;
         unsigned char apic_mode;
-        unsigned long snum;    
+        unsigned long snum;
         char ptype[16];
         char sname[64];
         char pname[64];
@@ -68,11 +68,11 @@ struct psai {
 };
 
 struct es7000_mem_info {
-        unsigned char type;   
+        unsigned char type;
         unsigned char length;
         unsigned char resv[6];
-        unsigned long long  start; 
-        unsigned long long  size; 
+        unsigned long long  start;
+        unsigned long long  size;
 };
 
 struct es7000_oem_table {
@@ -106,7 +106,7 @@ struct mip_reg {
 };
 
 #define MIP_SW_APIC             0x1020b
-#define MIP_FUNC(VALUE)         (VALUE & 0xff)
+#define MIP_FUNC(VALUE)         (VALUE & 0xff)
 
 extern int parse_unisys_oem (char *oemptr);
 extern void setup_unisys(void);
diff --git a/arch/x86/mach-es7000/es7000plat.c b/arch/x86/es7000/es7000plat.c
index 50189af14b85..7789fde13c3f 100644
--- a/arch/x86/mach-es7000/es7000plat.c
+++ b/arch/x86/es7000/es7000plat.c
@@ -72,7 +72,7 @@ es7000_rename_gsi(int ioapic, int gsi)
                         base += nr_ioapic_registers[i];
         }
 
-        if (!ioapic && (gsi < 16)) 
+        if (!ioapic && (gsi < 16))
                 gsi += base;
         return gsi;
 }
diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile
index 3db651fc8ec5..a07ec14f3312 100644
--- a/arch/x86/kernel/Makefile
+++ b/arch/x86/kernel/Makefile
@@ -104,6 +104,8 @@ obj-$(CONFIG_OLPC)		+= olpc.o
 ifeq ($(CONFIG_X86_64),y)
         obj-y                           += genapic_64.o genapic_flat_64.o genx2apic_uv_x.o tlb_uv.o
         obj-y                           += bios_uv.o
+        obj-y                           += genx2apic_cluster.o
+        obj-y                           += genx2apic_phys.o
         obj-$(CONFIG_X86_PM_TIMER)      += pmtimer_64.o
         obj-$(CONFIG_AUDIT)             += audit_64.o
 
diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c
index 7d40ef7b36e3..c2ac1b4515a0 100644
--- a/arch/x86/kernel/acpi/boot.c
+++ b/arch/x86/kernel/acpi/boot.c
@@ -252,10 +252,8 @@ static void __cpuinit acpi_register_lapic(int id, u8 enabled)
                 return;
         }
 
-#ifdef CONFIG_X86_32
         if (boot_cpu_physical_apicid != -1U)
                 ver = apic_version[boot_cpu_physical_apicid];
-#endif
 
         generic_processor_info(id, ver);
 }
@@ -774,11 +772,9 @@ static void __init acpi_register_lapic_address(unsigned long address)
 
         set_fixmap_nocache(FIX_APIC_BASE, address);
         if (boot_cpu_physical_apicid == -1U) {
-                boot_cpu_physical_apicid  = GET_APIC_ID(read_apic_id());
-#ifdef CONFIG_X86_32
+                boot_cpu_physical_apicid  = read_apic_id();
                 apic_version[boot_cpu_physical_apicid] =
                          GET_APIC_VERSION(apic_read(APIC_LVR));
-#endif
         }
 }
 
@@ -1350,7 +1346,9 @@ static void __init acpi_process_madt(void)
                                 acpi_ioapic = 1;
 
                                 smp_found_config = 1;
+#ifdef CONFIG_X86_32
                                 setup_apic_routing();
+#endif
                         }
                 }
                 if (error == -EINVAL) {
diff --git a/arch/x86/kernel/apic_32.c b/arch/x86/kernel/apic_32.c
index f88bd0d982b0..a91c57cb666a 100644
--- a/arch/x86/kernel/apic_32.c
+++ b/arch/x86/kernel/apic_32.c
@@ -60,10 +60,8 @@ unsigned long mp_lapic_addr;
 static int force_enable_local_apic;
 int disable_apic;
 
-/* Local APIC timer verification ok */
-static int local_apic_timer_verify_ok;
 /* Disable local APIC timer from the kernel commandline or via dmi quirk */
-static int local_apic_timer_disabled;
+static int disable_apic_timer __cpuinitdata;
 /* Local APIC timer works in C2 */
 int local_apic_timer_c2_ok;
 EXPORT_SYMBOL_GPL(local_apic_timer_c2_ok);
@@ -130,7 +128,11 @@ static inline int lapic_get_version(void)
  */
 static inline int lapic_is_integrated(void)
 {
+#ifdef CONFIG_X86_64
+        return 1;
+#else
         return APIC_INTEGRATED(lapic_get_version());
+#endif
 }
 
 /*
@@ -145,13 +147,18 @@ static int modern_apic(void)
         return lapic_get_version() >= 0x14;
 }
 
-void apic_wait_icr_idle(void)
+/*
+ * Paravirt kernels also might be using these below ops. So we still
+ * use generic apic_read()/apic_write(), which might be pointing to different
+ * ops in PARAVIRT case.
+ */
+void xapic_wait_icr_idle(void)
 {
         while (apic_read(APIC_ICR) & APIC_ICR_BUSY)
                 cpu_relax();
 }
 
-u32 safe_apic_wait_icr_idle(void)
+u32 safe_xapic_wait_icr_idle(void)
 {
         u32 send_status;
         int timeout;
@@ -167,16 +174,48 @@ u32 safe_apic_wait_icr_idle(void)
         return send_status;
 }
 
+void xapic_icr_write(u32 low, u32 id)
+{
+        apic_write(APIC_ICR2, SET_APIC_DEST_FIELD(id));
+        apic_write(APIC_ICR, low);
+}
+
+u64 xapic_icr_read(void)
+{
+        u32 icr1, icr2;
+
+        icr2 = apic_read(APIC_ICR2);
+        icr1 = apic_read(APIC_ICR);
+
+        return icr1 | ((u64)icr2 << 32);
+}
+
+static struct apic_ops xapic_ops = {
+        .read = native_apic_mem_read,
+        .write = native_apic_mem_write,
+        .icr_read = xapic_icr_read,
+        .icr_write = xapic_icr_write,
+        .wait_icr_idle = xapic_wait_icr_idle,
+        .safe_wait_icr_idle = safe_xapic_wait_icr_idle,
+};
+
+struct apic_ops __read_mostly *apic_ops = &xapic_ops;
+EXPORT_SYMBOL_GPL(apic_ops);
+
 /**
  * enable_NMI_through_LVT0 - enable NMI through local vector table 0
  */
 void __cpuinit enable_NMI_through_LVT0(void)
 {
-        unsigned int v = APIC_DM_NMI;
+        unsigned int v;
 
-        /* Level triggered for 82489DX */
+        /* unmask and set to NMI */
+        v = APIC_DM_NMI;
+
+        /* Level triggered for 82489DX (32bit mode) */
         if (!lapic_is_integrated())
                 v |= APIC_LVT_LEVEL_TRIGGER;
+
         apic_write(APIC_LVT0, v);
 }
 
@@ -193,9 +232,13 @@ int get_physical_broadcast(void)
  */
 int lapic_get_maxlvt(void)
 {
-        unsigned int v = apic_read(APIC_LVR);
+        unsigned int v;
 
-        /* 82489DXs do not report # of LVT entries. */
+        v = apic_read(APIC_LVR);
+        /*
+         * - we always have APIC integrated on 64bit mode
+         * - 82489DXs do not report # of LVT entries
+         */
         return APIC_INTEGRATED(GET_APIC_VERSION(v)) ? GET_APIC_MAXLVT(v) : 2;
 }
 
@@ -203,8 +246,12 @@ int lapic_get_maxlvt(void)
  * Local APIC timer
  */
 
-/* Clock divisor is set to 16 */
+/* Clock divisor */
+#ifdef CONFG_X86_64
+#define APIC_DIVISOR 1
+#else
 #define APIC_DIVISOR 16
+#endif
 
 /*
  * This function sets up the local APIC timer, with a timeout of
@@ -212,6 +259,9 @@ int lapic_get_maxlvt(void)
  * this function twice on the boot CPU, once with a bogus timeout
  * value, second time for real. The other (noncalibrating) CPUs
  * call this function only once, with the real, calibrated value.
+ *
+ * We do reads before writes even if unnecessary, to get around the
+ * P5 APIC double write bug.
  */
 static void __setup_APIC_LVTT(unsigned int clocks, int oneshot, int irqen)
 {
@@ -233,14 +283,44 @@ static void __setup_APIC_LVTT(unsigned int clocks, int oneshot, int irqen)
          */
         tmp_value = apic_read(APIC_TDCR);
         apic_write(APIC_TDCR,
-                   (tmp_value & ~(APIC_TDR_DIV_1 | APIC_TDR_DIV_TMBASE)) |
-                   APIC_TDR_DIV_16);
+                (tmp_value & ~(APIC_TDR_DIV_1 | APIC_TDR_DIV_TMBASE)) |
+                APIC_TDR_DIV_16);
 
         if (!oneshot)
                 apic_write(APIC_TMICT, clocks / APIC_DIVISOR);
 }
 
 /*
+ * Setup extended LVT, AMD specific (K8, family 10h)
+ *
+ * Vector mappings are hard coded. On K8 only offset 0 (APIC500) and
+ * MCE interrupts are supported. Thus MCE offset must be set to 0.
+ */
+
+#define APIC_EILVT_LVTOFF_MCE 0
+#define APIC_EILVT_LVTOFF_IBS 1
+
+static void setup_APIC_eilvt(u8 lvt_off, u8 vector, u8 msg_type, u8 mask)
+{
+        unsigned long reg = (lvt_off << 4) + APIC_EILVT0;
+        unsigned int  v   = (mask << 16) | (msg_type << 8) | vector;
+
+        apic_write(reg, v);
+}
+
+u8 setup_APIC_eilvt_mce(u8 vector, u8 msg_type, u8 mask)
+{
+        setup_APIC_eilvt(APIC_EILVT_LVTOFF_MCE, vector, msg_type, mask);
+        return APIC_EILVT_LVTOFF_MCE;
+}
+
+u8 setup_APIC_eilvt_ibs(u8 vector, u8 msg_type, u8 mask)
+{
+        setup_APIC_eilvt(APIC_EILVT_LVTOFF_IBS, vector, msg_type, mask);
+        return APIC_EILVT_LVTOFF_IBS;
+}
+
+/*
  * Program the next event, relative to now
  */
 static int lapic_next_event(unsigned long delta,
@@ -259,8 +339,8 @@ static void lapic_timer_setup(enum clock_event_mode mode,
         unsigned long flags;
         unsigned int v;
 
-        /* Lapic used for broadcast ? */
-        if (!local_apic_timer_verify_ok)
+        /* Lapic used as dummy for broadcast ? */
+        if (evt->features & CLOCK_EVT_FEAT_DUMMY)
                 return;
 
         local_irq_save(flags);
@@ -473,7 +553,7 @@ static int __init calibrate_APIC_clock(void)
                 return -1;
         }
 
-        local_apic_timer_verify_ok = 1;
+        levt->features &= ~CLOCK_EVT_FEAT_DUMMY;
 
         /* We trust the pm timer based calibration */
         if (!pm_referenced) {
@@ -507,11 +587,11 @@ static int __init calibrate_APIC_clock(void)
                 if (deltaj >= LAPIC_CAL_LOOPS-2 && deltaj <= LAPIC_CAL_LOOPS+2)
                         apic_printk(APIC_VERBOSE, "... jiffies result ok\n");
                 else
-                        local_apic_timer_verify_ok = 0;
+                        levt->features |= CLOCK_EVT_FEAT_DUMMY;
         } else
                 local_irq_enable();
 
-        if (!local_apic_timer_verify_ok) {
+        if (levt->features & CLOCK_EVT_FEAT_DUMMY) {
                 printk(KERN_WARNING
                        "APIC timer disabled due to verification failure.\n");
                         return -1;
@@ -533,7 +613,8 @@ void __init setup_boot_APIC_clock(void)
          * timer as a dummy clock event source on SMP systems, so the
          * broadcast mechanism is used. On UP systems simply ignore it.
          */
-        if (local_apic_timer_disabled) {
+        if (disable_apic_timer) {
+                printk(KERN_INFO "Disabling APIC timer\n");
                 /* No broadcast on UP ! */
                 if (num_possible_cpus() > 1) {
                         lapic_clockevent.mult = 1;
@@ -602,7 +683,11 @@ static void local_apic_timer_interrupt(void)
         /*
          * the NMI deadlock-detector uses this.
          */
+#ifdef CONFIG_X86_64
+        add_pda(apic_timer_irqs, 1);
+#else
         per_cpu(irq_stat, cpu).apic_timer_irqs++;
+#endif
 
         evt->event_handler(evt);
 }
@@ -642,35 +727,6 @@ int setup_profiling_timer(unsigned int multiplier)
 }
 
 /*
- * Setup extended LVT, AMD specific (K8, family 10h)
- *
- * Vector mappings are hard coded. On K8 only offset 0 (APIC500) and
- * MCE interrupts are supported. Thus MCE offset must be set to 0.
- */
-
-#define APIC_EILVT_LVTOFF_MCE 0
-#define APIC_EILVT_LVTOFF_IBS 1
-
-static void setup_APIC_eilvt(u8 lvt_off, u8 vector, u8 msg_type, u8 mask)
-{
-        unsigned long reg = (lvt_off << 4) + APIC_EILVT0;
-        unsigned int  v   = (mask << 16) | (msg_type << 8) | vector;
-        apic_write(reg, v);
-}
-
-u8 setup_APIC_eilvt_mce(u8 vector, u8 msg_type, u8 mask)
-{
-        setup_APIC_eilvt(APIC_EILVT_LVTOFF_MCE, vector, msg_type, mask);
-        return APIC_EILVT_LVTOFF_MCE;
-}
-
-u8 setup_APIC_eilvt_ibs(u8 vector, u8 msg_type, u8 mask)
-{
-        setup_APIC_eilvt(APIC_EILVT_LVTOFF_IBS, vector, msg_type, mask);
-        return APIC_EILVT_LVTOFF_IBS;
-}
-
-/*
  * Local APIC start and shutdown
  */
 
@@ -715,7 +771,7 @@ void clear_local_APIC(void)
         }
 
         /* lets not touch this if we didn't frob it */
-#ifdef CONFIG_X86_MCE_P4THERMAL
+#if defined(CONFIG_X86_MCE_P4THERMAL) || defined(X86_MCE_INTEL)
         if (maxlvt >= 5) {
                 v = apic_read(APIC_LVTTHMR);
                 apic_write(APIC_LVTTHMR, v | APIC_LVT_MASKED);
@@ -732,10 +788,6 @@ void clear_local_APIC(void)
         if (maxlvt >= 4)
                 apic_write(APIC_LVTPC, APIC_LVT_MASKED);
 
-#ifdef CONFIG_X86_MCE_P4THERMAL
-        if (maxlvt >= 5)
-                apic_write(APIC_LVTTHMR, APIC_LVT_MASKED);
-#endif
         /* Integrated APIC (!82489DX) ? */
         if (lapic_is_integrated()) {
                 if (maxlvt > 3)
@@ -750,7 +802,7 @@ void clear_local_APIC(void)
  */
 void disable_local_APIC(void)
 {
-        unsigned long value;
+        unsigned int value;
 
         clear_local_APIC();
 
@@ -762,6 +814,7 @@ void disable_local_APIC(void)
         value &= ~APIC_SPIV_APIC_ENABLED;
         apic_write(APIC_SPIV, value);
 
+#ifdef CONFIG_X86_32
         /*
          * When LAPIC was disabled by the BIOS and enabled by the kernel,
          * restore the disabled state.
@@ -773,6 +826,7 @@ void disable_local_APIC(void)
                 l &= ~MSR_IA32_APICBASE_ENABLE;
                 wrmsr(MSR_IA32_APICBASE, l, h);
         }
+#endif
 }
 
 /*
@@ -789,11 +843,15 @@ void lapic_shutdown(void)
                 return;
 
         local_irq_save(flags);
-        clear_local_APIC();
 
-        if (enabled_via_apicbase)
+#ifdef CONFIG_X86_32
+        if (!enabled_via_apicbase)
+                clear_local_APIC();
+        else
+#endif
                 disable_local_APIC();
 
+
         local_irq_restore(flags);
 }
 
@@ -838,6 +896,12 @@ int __init verify_local_APIC(void)
          */
         reg0 = apic_read(APIC_ID);
         apic_printk(APIC_DEBUG, "Getting ID: %x\n", reg0);
+        apic_write(APIC_ID, reg0 ^ APIC_ID_MASK);
+        reg1 = apic_read(APIC_ID);
+        apic_printk(APIC_DEBUG, "Getting ID: %x\n", reg1);
+        apic_write(APIC_ID, reg0);
+        if (reg1 != (reg0 ^ APIC_ID_MASK))
+                return 0;
 
         /*
          * The next two are just to see if we have sane values.
@@ -863,14 +927,15 @@ void __init sync_Arb_IDs(void)
          */
         if (modern_apic() || boot_cpu_data.x86_vendor == X86_VENDOR_AMD)
                 return;
+
         /*
          * Wait for idle.
          */
         apic_wait_icr_idle();
 
         apic_printk(APIC_DEBUG, "Synchronizing Arb IDs.\n");
-        apic_write(APIC_ICR,
-                   APIC_DEST_ALLINC | APIC_INT_LEVELTRIG | APIC_DM_INIT);
+        apic_write(APIC_ICR, APIC_DEST_ALLINC |
+                        APIC_INT_LEVELTRIG | APIC_DM_INIT);
 }
 
 /*
@@ -878,7 +943,7 @@ void __init sync_Arb_IDs(void)
  */
 void __init init_bsp_APIC(void)
 {
-        unsigned long value;
+        unsigned int value;
 
         /*
          * Don't do the setup now if we have a SMP BIOS as the
@@ -899,11 +964,13 @@ void __init init_bsp_APIC(void)
         value &= ~APIC_VECTOR_MASK;
         value |= APIC_SPIV_APIC_ENABLED;
 
+#ifdef CONFIG_X86_32
         /* This bit is reserved on P4/Xeon and should be cleared */
         if ((boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) &&
             (boot_cpu_data.x86 == 15))
                 value &= ~APIC_SPIV_FOCUS_DISABLED;
         else
+#endif
                 value |= APIC_SPIV_FOCUS_DISABLED;
         value |= SPURIOUS_APIC_VECTOR;
         apic_write(APIC_SPIV, value);
@@ -922,6 +989,16 @@ static void __cpuinit lapic_setup_esr(void)
 {
         unsigned long oldvalue, value, maxlvt;
         if (lapic_is_integrated() && !esr_disable) {
+                if (esr_disable) {
+                        /*
+                         * Something untraceable is creating bad interrupts on
+                         * secondary quads ... for the moment, just leave the
+                         * ESR disabled - we can't do anything useful with the
+                         * errors anyway - mbligh
+                         */
+                        printk(KERN_INFO "Leaving ESR disabled.\n");
+                        return;
+                }
                 /* !82489DX */
                 maxlvt = lapic_get_maxlvt();
                 if (maxlvt > 3)         /* Due to the Pentium erratum 3AP. */
@@ -942,16 +1019,7 @@ static void __cpuinit lapic_setup_esr(void)
                                 "vector: 0x%08lx  after: 0x%08lx\n",
                                 oldvalue, value);
         } else {
-                if (esr_disable)
-                        /*
-                         * Something untraceable is creating bad interrupts on
-                         * secondary quads ... for the moment, just leave the
-                         * ESR disabled - we can't do anything useful with the
-                         * errors anyway - mbligh
-                         */
-                        printk(KERN_INFO "Leaving ESR disabled.\n");
-                else
-                        printk(KERN_INFO "No ESR for 82489DX.\n");
+                printk(KERN_INFO "No ESR for 82489DX.\n");
         }
 }
 
@@ -1089,13 +1157,17 @@ void __cpuinit setup_local_APIC(void)
 
 void __cpuinit end_local_APIC_setup(void)
 {
-        unsigned long value;
-
         lapic_setup_esr();
-        /* Disable the local apic timer */
-        value = apic_read(APIC_LVTT);
-        value |= (APIC_LVT_MASKED | LOCAL_TIMER_VECTOR);
-        apic_write(APIC_LVTT, value);
+
+#ifdef CONFIG_X86_32
+        {
+                unsigned int value;
+                /* Disable the local apic timer */
+                value = apic_read(APIC_LVTT);
+                value |= (APIC_LVT_MASKED | LOCAL_TIMER_VECTOR);
+                apic_write(APIC_LVTT, value);
+        }
+#endif
 
         setup_apic_nmi_watchdog(NULL);
         apic_pm_activate();
@@ -1205,7 +1277,7 @@ void __init init_apic_mappings(void)
          * default configuration (or the MP table is broken).
          */
         if (boot_cpu_physical_apicid == -1U)
-                boot_cpu_physical_apicid = GET_APIC_ID(read_apic_id());
+                boot_cpu_physical_apicid = read_apic_id();
 
 }
 
@@ -1242,7 +1314,7 @@ int __init APIC_init_uniprocessor(void)
          * might be zero if read from MP tables. Get it from LAPIC.
          */
 #ifdef CONFIG_CRASH_DUMP
-        boot_cpu_physical_apicid = GET_APIC_ID(read_apic_id());
+        boot_cpu_physical_apicid = read_apic_id();
 #endif
         physid_set_mask_of_physid(boot_cpu_physical_apicid, &phys_cpu_present_map);
 
@@ -1321,59 +1393,12 @@ void smp_error_interrupt(struct pt_regs *regs)
         irq_exit();
 }
 
-#ifdef CONFIG_SMP
-void __init smp_intr_init(void)
-{
-        /*
-         * IRQ0 must be given a fixed assignment and initialized,
-         * because it's used before the IO-APIC is set up.
-         */
-        set_intr_gate(FIRST_DEVICE_VECTOR, interrupt[0]);
-
-        /*
-         * The reschedule interrupt is a CPU-to-CPU reschedule-helper
-         * IPI, driven by wakeup.
-         */
-        alloc_intr_gate(RESCHEDULE_VECTOR, reschedule_interrupt);
-
-        /* IPI for invalidation */
-        alloc_intr_gate(INVALIDATE_TLB_VECTOR, invalidate_interrupt);
-
-        /* IPI for generic function call */
-        alloc_intr_gate(CALL_FUNCTION_VECTOR, call_function_interrupt);
-
-        /* IPI for single call function */
-        set_intr_gate(CALL_FUNCTION_SINGLE_VECTOR,
-                                call_function_single_interrupt);
-}
-#endif
-
-/*
- * Initialize APIC interrupts
- */
-void __init apic_intr_init(void)
-{
-#ifdef CONFIG_SMP
-        smp_intr_init();
-#endif
-        /* self generated IPI for local APIC timer */
-        alloc_intr_gate(LOCAL_TIMER_VECTOR, apic_timer_interrupt);
-
-        /* IPI vectors for APIC spurious and error interrupts */
-        alloc_intr_gate(SPURIOUS_APIC_VECTOR, spurious_interrupt);
-        alloc_intr_gate(ERROR_APIC_VECTOR, error_interrupt);
-
-        /* thermal monitor LVT interrupt */
-#ifdef CONFIG_X86_MCE_P4THERMAL
-        alloc_intr_gate(THERMAL_APIC_VECTOR, thermal_interrupt);
-#endif
-}
-
 /**
  * connect_bsp_APIC - attach the APIC to the interrupt system
  */
 void __init connect_bsp_APIC(void)
 {
+#ifdef CONFIG_X86_32
         if (pic_mode) {
                 /*
                  * Do not trust the local APIC being empty at bootup.
@@ -1388,6 +1413,7 @@ void __init connect_bsp_APIC(void)
                 outb(0x70, 0x22);
                 outb(0x01, 0x23);
         }
+#endif
         enable_apic_mode();
 }
 
@@ -1400,6 +1426,9 @@ void __init connect_bsp_APIC(void)
  */
 void disconnect_bsp_APIC(int virt_wire_setup)
 {
+        unsigned int value;
+
+#ifdef CONFIG_X86_32
         if (pic_mode) {
                 /*
                  * Put the board back into PIC mode (has an effect only on
@@ -1411,54 +1440,53 @@ void disconnect_bsp_APIC(int virt_wire_setup)
                                 "entering PIC mode.\n");
                 outb(0x70, 0x22);
                 outb(0x00, 0x23);
-        } else {
-                /* Go back to Virtual Wire compatibility mode */
-                unsigned long value;
+                return;
+        }
+#endif
 
-                /* For the spurious interrupt use vector F, and enable it */
-                value = apic_read(APIC_SPIV);
-                value &= ~APIC_VECTOR_MASK;
-                value |= APIC_SPIV_APIC_ENABLED;
-                value |= 0xf;
-                apic_write(APIC_SPIV, value);
+        /* Go back to Virtual Wire compatibility mode */
 
-                if (!virt_wire_setup) {
-                        /*
-                         * For LVT0 make it edge triggered, active high,
-                         * external and enabled
-                         */
-                        value = apic_read(APIC_LVT0);
-                        value &= ~(APIC_MODE_MASK | APIC_SEND_PENDING |
-                                APIC_INPUT_POLARITY | APIC_LVT_REMOTE_IRR |
-                                APIC_LVT_LEVEL_TRIGGER | APIC_LVT_MASKED);
-                        value |= APIC_LVT_REMOTE_IRR | APIC_SEND_PENDING;
-                        value = SET_APIC_DELIVERY_MODE(value, APIC_MODE_EXTINT);
-                        apic_write(APIC_LVT0, value);
-                } else {
-                        /* Disable LVT0 */
-                        apic_write(APIC_LVT0, APIC_LVT_MASKED);
-                }
+        /* For the spurious interrupt use vector F, and enable it */
+        value = apic_read(APIC_SPIV);
+        value &= ~APIC_VECTOR_MASK;
+        value |= APIC_SPIV_APIC_ENABLED;
+        value |= 0xf;
+        apic_write(APIC_SPIV, value);
 
+        if (!virt_wire_setup) {
                 /*
-                 * For LVT1 make it edge triggered, active high, nmi and
-                 * enabled
+                 * For LVT0 make it edge triggered, active high,
+                 * external and enabled
                  */
-                value = apic_read(APIC_LVT1);
-                value &= ~(
-                        APIC_MODE_MASK | APIC_SEND_PENDING |
+                value = apic_read(APIC_LVT0);
+                value &= ~(APIC_MODE_MASK | APIC_SEND_PENDING |
                         APIC_INPUT_POLARITY | APIC_LVT_REMOTE_IRR |
                         APIC_LVT_LEVEL_TRIGGER | APIC_LVT_MASKED);
                 value |= APIC_LVT_REMOTE_IRR | APIC_SEND_PENDING;
-                value = SET_APIC_DELIVERY_MODE(value, APIC_MODE_NMI);
-                apic_write(APIC_LVT1, value);
+                value = SET_APIC_DELIVERY_MODE(value, APIC_MODE_EXTINT);
+                apic_write(APIC_LVT0, value);
+        } else {
+                /* Disable LVT0 */
+                apic_write(APIC_LVT0, APIC_LVT_MASKED);
         }
+
+        /*
+         * For LVT1 make it edge triggered, active high,
+         * nmi and enabled
+         */
+        value = apic_read(APIC_LVT1);
+        value &= ~(APIC_MODE_MASK | APIC_SEND_PENDING |
+                        APIC_INPUT_POLARITY | APIC_LVT_REMOTE_IRR |
+                        APIC_LVT_LEVEL_TRIGGER | APIC_LVT_MASKED);
+        value |= APIC_LVT_REMOTE_IRR | APIC_SEND_PENDING;
+        value = SET_APIC_DELIVERY_MODE(value, APIC_MODE_NMI);
+        apic_write(APIC_LVT1, value);
 }
 
 void __cpuinit generic_processor_info(int apicid, int version)
 {
         int cpu;
         cpumask_t tmp_map;
-        physid_mask_t phys_cpu;
 
         /*
          * Validate version
@@ -1471,9 +1499,6 @@ void __cpuinit generic_processor_info(int apicid, int version)
         }
         apic_version[apicid] = version;
 
-        phys_cpu = apicid_to_cpu_present(apicid);
-        physids_or(phys_cpu_present_map, phys_cpu_present_map, phys_cpu);
-
         if (num_processors >= NR_CPUS) {
                 printk(KERN_WARNING "WARNING: NR_CPUS limit of %i reached."
                         "  Processor ignored.\n", NR_CPUS);
@@ -1484,17 +1509,19 @@ void __cpuinit generic_processor_info(int apicid, int version)
         cpus_complement(tmp_map, cpu_present_map);
         cpu = first_cpu(tmp_map);
 
-        if (apicid == boot_cpu_physical_apicid)
+        physid_set(apicid, phys_cpu_present_map);
+        if (apicid == boot_cpu_physical_apicid) {
                 /*
                  * x86_bios_cpu_apicid is required to have processors listed
                  * in same order as logical cpu numbers. Hence the first
                  * entry is BSP, and so on.
                  */
                 cpu = 0;
-
+        }
         if (apicid > max_physical_apicid)
                 max_physical_apicid = apicid;
 
+#ifdef CONFIG_X86_32
         /*
          * Would be preferable to switch to bigsmp when CONFIG_HOTPLUG_CPU=y
          * but we need to work other dependencies like SMP_SUSPEND etc
@@ -1514,7 +1541,9 @@ void __cpuinit generic_processor_info(int apicid, int version)
                         def_to_bigsmp = 1;
                 }
         }
-#ifdef CONFIG_SMP
+#endif
+
+#if defined(CONFIG_X86_SMP) || defined(CONFIG_X86_64)
         /* are we being called early in kernel startup? */
         if (early_per_cpu_ptr(x86_cpu_to_apicid)) {
                 u16 *cpu_to_apicid = early_per_cpu_ptr(x86_cpu_to_apicid);
@@ -1527,6 +1556,7 @@ void __cpuinit generic_processor_info(int apicid, int version)
                 per_cpu(x86_bios_cpu_apicid, cpu) = apicid;
         }
 #endif
+
         cpu_set(cpu, cpu_possible_map);
         cpu_set(cpu, cpu_present_map);
 }
@@ -1537,6 +1567,11 @@ void __cpuinit generic_processor_info(int apicid, int version)
 #ifdef CONFIG_PM
 
 static struct {
+        /*
+         * 'active' is true if the local APIC was enabled by us and
+         * not the BIOS; this signifies that we are also responsible
+         * for disabling it before entering apm/acpi suspend
+         */
         int active;
         /* r/w apic fields */
         unsigned int apic_id;
@@ -1577,7 +1612,7 @@ static int lapic_suspend(struct sys_device *dev, pm_message_t state)
         apic_pm_state.apic_lvterr = apic_read(APIC_LVTERR);
         apic_pm_state.apic_tmict = apic_read(APIC_TMICT);
         apic_pm_state.apic_tdcr = apic_read(APIC_TDCR);
-#ifdef CONFIG_X86_MCE_P4THERMAL
+#if defined(CONFIG_X86_MCE_P4THERMAL) || defined(CONFIG_X86_MCE_INTEL)
         if (maxlvt >= 5)
                 apic_pm_state.apic_thmr = apic_read(APIC_LVTTHMR);
 #endif
@@ -1601,16 +1636,23 @@ static int lapic_resume(struct sys_device *dev)
 
         local_irq_save(flags);
 
-        /*
-         * Make sure the APICBASE points to the right address
-         *
-         * FIXME! This will be wrong if we ever support suspend on
-         * SMP! We'll need to do this as part of the CPU restore!
-         */
-        rdmsr(MSR_IA32_APICBASE, l, h);
-        l &= ~MSR_IA32_APICBASE_BASE;
-        l |= MSR_IA32_APICBASE_ENABLE | mp_lapic_addr;
-        wrmsr(MSR_IA32_APICBASE, l, h);
+#ifdef CONFIG_X86_64
+        if (x2apic)
+                enable_x2apic();
+        else
+#endif
+        {
+                /*
+                 * Make sure the APICBASE points to the right address
+                 *
+                 * FIXME! This will be wrong if we ever support suspend on
+                 * SMP! We'll need to do this as part of the CPU restore!
+                 */
+                rdmsr(MSR_IA32_APICBASE, l, h);
+                l &= ~MSR_IA32_APICBASE_BASE;
+                l |= MSR_IA32_APICBASE_ENABLE | mp_lapic_addr;
+                wrmsr(MSR_IA32_APICBASE, l, h);
+        }
 
         apic_write(APIC_LVTERR, ERROR_APIC_VECTOR | APIC_LVT_MASKED);
         apic_write(APIC_ID, apic_pm_state.apic_id);
@@ -1620,7 +1662,7 @@ static int lapic_resume(struct sys_device *dev)
         apic_write(APIC_SPIV, apic_pm_state.apic_spiv);
         apic_write(APIC_LVT0, apic_pm_state.apic_lvt0);
         apic_write(APIC_LVT1, apic_pm_state.apic_lvt1);
-#ifdef CONFIG_X86_MCE_P4THERMAL
+#if defined(CONFIG_X86_MCE_P4THERMAL) || defined(CONFIG_X86_MCE_INTEL)
         if (maxlvt >= 5)
                 apic_write(APIC_LVTTHMR, apic_pm_state.apic_thmr);
 #endif
@@ -1634,7 +1676,9 @@ static int lapic_resume(struct sys_device *dev)
         apic_write(APIC_LVTERR, apic_pm_state.apic_lvterr);
         apic_write(APIC_ESR, 0);
         apic_read(APIC_ESR);
+
         local_irq_restore(flags);
+
         return 0;
 }
 
@@ -1690,20 +1734,20 @@ static int __init parse_lapic(char *arg)
 }
 early_param("lapic", parse_lapic);
 
-static int __init parse_nolapic(char *arg)
+static int __init setup_disableapic(char *arg)
 {
         disable_apic = 1;
         setup_clear_cpu_cap(X86_FEATURE_APIC);
         return 0;
 }
-early_param("nolapic", parse_nolapic);
+early_param("disableapic", setup_disableapic);
 
-static int __init parse_disable_lapic_timer(char *arg)
+/* same as disableapic, for compatibility */
+static int __init setup_nolapic(char *arg)
 {
-        local_apic_timer_disabled = 1;
-        return 0;
+        return setup_disableapic(arg);
 }
-early_param("nolapic_timer", parse_disable_lapic_timer);
+early_param("nolapic", setup_nolapic);
 
 static int __init parse_lapic_timer_c2_ok(char *arg)
 {
@@ -1712,15 +1756,40 @@ static int __init parse_lapic_timer_c2_ok(char *arg)
 }
 early_param("lapic_timer_c2_ok", parse_lapic_timer_c2_ok);
 
+static int __init parse_disable_apic_timer(char *arg)
+{
+        disable_apic_timer = 1;
+        return 0;
+}
+early_param("noapictimer", parse_disable_apic_timer);
+
+static int __init parse_nolapic_timer(char *arg)
+{
+        disable_apic_timer = 1;
+        return 0;
+}
+early_param("nolapic_timer", parse_nolapic_timer);
+
 static int __init apic_set_verbosity(char *arg)
 {
-        if (!arg)
+        if (!arg)  {
+#ifdef CONFIG_X86_64
+                skip_ioapic_setup = 0;
+                ioapic_force = 1;
+                return 0;
+#endif
                 return -EINVAL;
+        }
 
-        if (strcmp(arg, "debug") == 0)
+        if (strcmp("debug", arg) == 0)
                 apic_verbosity = APIC_DEBUG;
-        else if (strcmp(arg, "verbose") == 0)
+        else if (strcmp("verbose", arg) == 0)
                 apic_verbosity = APIC_VERBOSE;
+        else {
+                printk(KERN_WARNING "APIC Verbosity level %s not recognised"
+                        " use apic=verbose or apic=debug\n", arg);
+                return -EINVAL;
+        }
 
         return 0;
 }
diff --git a/arch/x86/kernel/apic_64.c b/arch/x86/kernel/apic_64.c
index 446c062e831c..53898b65a6ae 100644
--- a/arch/x86/kernel/apic_64.c
+++ b/arch/x86/kernel/apic_64.c
@@ -27,6 +27,7 @@
 #include <linux/clockchips.h>
 #include <linux/acpi_pmtmr.h>
 #include <linux/module.h>
+#include <linux/dmar.h>
 
 #include <asm/atomic.h>
 #include <asm/smp.h>
@@ -39,13 +40,20 @@
 #include <asm/proto.h>
 #include <asm/timex.h>
 #include <asm/apic.h>
+#include <asm/i8259.h>
 
 #include <mach_ipi.h>
 #include <mach_apic.h>
 
+/* Disable local APIC timer from the kernel commandline or via dmi quirk */
 static int disable_apic_timer __cpuinitdata;
 static int apic_calibrate_pmtmr __initdata;
 int disable_apic;
+int disable_x2apic;
+int x2apic;
+
+/* x2apic enabled before OS handover */
+int x2apic_preenabled;
 
 /* Local APIC timer works in C2 */
 int local_apic_timer_c2_ok;
@@ -73,6 +81,9 @@ static void lapic_timer_setup(enum clock_event_mode mode,
 static void lapic_timer_broadcast(cpumask_t mask);
 static void apic_pm_activate(void);
 
+/*
+ * The local apic timer can be used for any function which is CPU local.
+ */
 static struct clock_event_device lapic_clockevent = {
         .name           = "lapic",
         .features       = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT
@@ -99,11 +110,15 @@ static inline int lapic_get_version(void)
 }
 
 /*
- * Check, if the APIC is integrated or a seperate chip
+ * Check, if the APIC is integrated or a separate chip
  */
 static inline int lapic_is_integrated(void)
 {
+#ifdef CONFIG_X86_64
         return 1;
+#else
+        return APIC_INTEGRATED(lapic_get_version());
+#endif
 }
 
 /*
@@ -118,13 +133,18 @@ static int modern_apic(void)
         return lapic_get_version() >= 0x14;
 }
 
-void apic_wait_icr_idle(void)
+/*
+ * Paravirt kernels also might be using these below ops. So we still
+ * use generic apic_read()/apic_write(), which might be pointing to different
+ * ops in PARAVIRT case.
+ */
+void xapic_wait_icr_idle(void)
 {
         while (apic_read(APIC_ICR) & APIC_ICR_BUSY)
                 cpu_relax();
 }
 
-u32 safe_apic_wait_icr_idle(void)
+u32 safe_xapic_wait_icr_idle(void)
 {
         u32 send_status;
         int timeout;
@@ -140,6 +160,68 @@ u32 safe_apic_wait_icr_idle(void)
         return send_status;
 }
 
+void xapic_icr_write(u32 low, u32 id)
+{
+        apic_write(APIC_ICR2, SET_APIC_DEST_FIELD(id));
+        apic_write(APIC_ICR, low);
+}
+
+u64 xapic_icr_read(void)
+{
+        u32 icr1, icr2;
+
+        icr2 = apic_read(APIC_ICR2);
+        icr1 = apic_read(APIC_ICR);
+
+        return icr1 | ((u64)icr2 << 32);
+}
+
+static struct apic_ops xapic_ops = {
+        .read = native_apic_mem_read,
+        .write = native_apic_mem_write,
+        .icr_read = xapic_icr_read,
+        .icr_write = xapic_icr_write,
+        .wait_icr_idle = xapic_wait_icr_idle,
+        .safe_wait_icr_idle = safe_xapic_wait_icr_idle,
+};
+
+struct apic_ops __read_mostly *apic_ops = &xapic_ops;
+EXPORT_SYMBOL_GPL(apic_ops);
+
+static void x2apic_wait_icr_idle(void)
+{
+        /* no need to wait for icr idle in x2apic */
+        return;
+}
+
+static u32 safe_x2apic_wait_icr_idle(void)
+{
+        /* no need to wait for icr idle in x2apic */
+        return 0;
+}
+
+void x2apic_icr_write(u32 low, u32 id)
+{
+        wrmsrl(APIC_BASE_MSR + (APIC_ICR >> 4), ((__u64) id) << 32 | low);
+}
+
+u64 x2apic_icr_read(void)
+{
+        unsigned long val;
+
+        rdmsrl(APIC_BASE_MSR + (APIC_ICR >> 4), val);
+        return val;
+}
+
+static struct apic_ops x2apic_ops = {
+        .read = native_apic_msr_read,
+        .write = native_apic_msr_write,
+        .icr_read = x2apic_icr_read,
+        .icr_write = x2apic_icr_write,
+        .wait_icr_idle = x2apic_wait_icr_idle,
+        .safe_wait_icr_idle = safe_x2apic_wait_icr_idle,
+};
+
 /**
  * enable_NMI_through_LVT0 - enable NMI through local vector table 0
  */
@@ -149,6 +231,11 @@ void __cpuinit enable_NMI_through_LVT0(void)
 
         /* unmask and set to NMI */
         v = APIC_DM_NMI;
+
+        /* Level triggered for 82489DX (32bit mode) */
+        if (!lapic_is_integrated())
+                v |= APIC_LVT_LEVEL_TRIGGER;
+
         apic_write(APIC_LVT0, v);
 }
 
@@ -157,14 +244,28 @@ void __cpuinit enable_NMI_through_LVT0(void)
  */
 int lapic_get_maxlvt(void)
 {
-        unsigned int v, maxlvt;
+        unsigned int v;
 
         v = apic_read(APIC_LVR);
-        maxlvt = GET_APIC_MAXLVT(v);
-        return maxlvt;
+        /*
+         * - we always have APIC integrated on 64bit mode
+         * - 82489DXs do not report # of LVT entries
+         */
+        return APIC_INTEGRATED(GET_APIC_VERSION(v)) ? GET_APIC_MAXLVT(v) : 2;
 }
 
 /*
+ * Local APIC timer
+ */
+
+/* Clock divisor */
+#ifdef CONFG_X86_64
+#define APIC_DIVISOR 1
+#else
+#define APIC_DIVISOR 16
+#endif
+
+/*
  * This function sets up the local APIC timer, with a timeout of
  * 'clocks' APIC bus clock. During calibration we actually call
  * this function twice on the boot CPU, once with a bogus timeout
@@ -174,7 +275,6 @@ int lapic_get_maxlvt(void)
  * We do reads before writes even if unnecessary, to get around the
  * P5 APIC double write bug.
  */
-
 static void __setup_APIC_LVTT(unsigned int clocks, int oneshot, int irqen)
 {
         unsigned int lvtt_value, tmp_value;
@@ -182,6 +282,9 @@ static void __setup_APIC_LVTT(unsigned int clocks, int oneshot, int irqen)
         lvtt_value = LOCAL_TIMER_VECTOR;
         if (!oneshot)
                 lvtt_value |= APIC_LVT_TIMER_PERIODIC;
+        if (!lapic_is_integrated())
+                lvtt_value |= SET_APIC_TIMER_BASE(APIC_TIMER_BASE_DIV);
+
         if (!irqen)
                 lvtt_value |= APIC_LVT_MASKED;
 
@@ -191,12 +294,12 @@ static void __setup_APIC_LVTT(unsigned int clocks, int oneshot, int irqen)
          * Divide PICLK by 16
          */
         tmp_value = apic_read(APIC_TDCR);
-        apic_write(APIC_TDCR, (tmp_value
-                                & ~(APIC_TDR_DIV_1 | APIC_TDR_DIV_TMBASE))
-                                | APIC_TDR_DIV_16);
+        apic_write(APIC_TDCR,
+                (tmp_value & ~(APIC_TDR_DIV_1 | APIC_TDR_DIV_TMBASE)) |
+                APIC_TDR_DIV_16);
 
         if (!oneshot)
-                apic_write(APIC_TMICT, clocks);
+                apic_write(APIC_TMICT, clocks / APIC_DIVISOR);
 }
 
 /*
@@ -366,7 +469,7 @@ static int __init calibrate_APIC_clock(void)
         lapic_clockevent.min_delta_ns =
                 clockevent_delta2ns(0xF, &lapic_clockevent);
 
-        calibration_result = result / HZ;
+        calibration_result = (result * APIC_DIVISOR) / HZ;
 
         /*
          * Do a sanity check on the APIC calibration result
@@ -388,10 +491,10 @@ static int __init calibrate_APIC_clock(void)
 void __init setup_boot_APIC_clock(void)
 {
         /*
-         * The local apic timer can be disabled via the kernel commandline.
-         * Register the lapic timer as a dummy clock event source on SMP
-         * systems, so the broadcast mechanism is used. On UP systems simply
-         * ignore it.
+         * The local apic timer can be disabled via the kernel
+         * commandline or from the CPU detection code. Register the lapic
+         * timer as a dummy clock event source on SMP systems, so the
+         * broadcast mechanism is used. On UP systems simply ignore it.
          */
         if (disable_apic_timer) {
                 printk(KERN_INFO "Disabling APIC timer\n");
@@ -403,7 +506,9 @@ void __init setup_boot_APIC_clock(void)
                 return;
         }
 
-        printk(KERN_INFO "Using local APIC timer interrupts.\n");
+        apic_printk(APIC_VERBOSE, "Using local APIC timer interrupts.\n"
+                    "calibrating APIC timer ...\n");
+
         if (calibrate_APIC_clock()) {
                 /* No broadcast on UP ! */
                 if (num_possible_cpus() > 1)
@@ -422,6 +527,7 @@ void __init setup_boot_APIC_clock(void)
                 printk(KERN_WARNING "APIC timer registered as dummy,"
                         " due to nmi_watchdog=%d!\n", nmi_watchdog);
 
+        /* Setup the lapic or request the broadcast */
         setup_APIC_timer();
 }
 
@@ -460,7 +566,11 @@ static void local_apic_timer_interrupt(void)
         /*
          * the NMI deadlock-detector uses this.
          */
+#ifdef CONFIG_X86_64
         add_pda(apic_timer_irqs, 1);
+#else
+        per_cpu(irq_stat, cpu).apic_timer_irqs++;
+#endif
 
         evt->event_handler(evt);
 }
@@ -491,6 +601,7 @@ void smp_apic_timer_interrupt(struct pt_regs *regs)
         irq_enter();
         local_apic_timer_interrupt();
         irq_exit();
+
         set_irq_regs(old_regs);
 }
 
@@ -544,6 +655,13 @@ void clear_local_APIC(void)
                 apic_write(APIC_LVTPC, v | APIC_LVT_MASKED);
         }
 
+        /* lets not touch this if we didn't frob it */
+#if defined(CONFIG_X86_MCE_P4THERMAL) || defined(X86_MCE_INTEL)
+        if (maxlvt >= 5) {
+                v = apic_read(APIC_LVTTHMR);
+                apic_write(APIC_LVTTHMR, v | APIC_LVT_MASKED);
+        }
+#endif
         /*
          * Clean APIC state for other OSs:
          */
@@ -554,8 +672,14 @@ void clear_local_APIC(void)
                 apic_write(APIC_LVTERR, APIC_LVT_MASKED);
         if (maxlvt >= 4)
                 apic_write(APIC_LVTPC, APIC_LVT_MASKED);
-        apic_write(APIC_ESR, 0);
-        apic_read(APIC_ESR);
+
+        /* Integrated APIC (!82489DX) ? */
+        if (lapic_is_integrated()) {
+                if (maxlvt > 3)
+                        /* Clear ESR due to Pentium errata 3AP and 11AP */
+                        apic_write(APIC_ESR, 0);
+                apic_read(APIC_ESR);
+        }
 }
 
 /**
@@ -574,8 +698,28 @@ void disable_local_APIC(void)
         value = apic_read(APIC_SPIV);
         value &= ~APIC_SPIV_APIC_ENABLED;
         apic_write(APIC_SPIV, value);
+
+#ifdef CONFIG_X86_32
+        /*
+         * When LAPIC was disabled by the BIOS and enabled by the kernel,
+         * restore the disabled state.
+         */
+        if (enabled_via_apicbase) {
+                unsigned int l, h;
+
+                rdmsr(MSR_IA32_APICBASE, l, h);
+                l &= ~MSR_IA32_APICBASE_ENABLE;
+                wrmsr(MSR_IA32_APICBASE, l, h);
+        }
+#endif
 }
 
+/*
+ * If Linux enabled the LAPIC against the BIOS default disable it down before
+ * re-entering the BIOS on shutdown.  Otherwise the BIOS may get confused and
+ * not power-off.  Additionally clear all LVT entries before disable_local_APIC
+ * for the case where Linux didn't enable the LAPIC.
+ */
 void lapic_shutdown(void)
 {
         unsigned long flags;
@@ -585,7 +729,13 @@ void lapic_shutdown(void)
 
         local_irq_save(flags);
 
-        disable_local_APIC();
+#ifdef CONFIG_X86_32
+        if (!enabled_via_apicbase)
+                clear_local_APIC();
+        else
+#endif
+                disable_local_APIC();
+
 
         local_irq_restore(flags);
 }
@@ -629,10 +779,10 @@ int __init verify_local_APIC(void)
         /*
          * The ID register is read/write in a real APIC.
          */
-        reg0 = read_apic_id();
+        reg0 = apic_read(APIC_ID);
         apic_printk(APIC_DEBUG, "Getting ID: %x\n", reg0);
         apic_write(APIC_ID, reg0 ^ APIC_ID_MASK);
-        reg1 = read_apic_id();
+        reg1 = apic_read(APIC_ID);
         apic_printk(APIC_DEBUG, "Getting ID: %x\n", reg1);
         apic_write(APIC_ID, reg0);
         if (reg1 != (reg0 ^ APIC_ID_MASK))
@@ -656,8 +806,11 @@ int __init verify_local_APIC(void)
  */
 void __init sync_Arb_IDs(void)
 {
-        /* Unsupported on P4 - see Intel Dev. Manual Vol. 3, Ch. 8.6.1 */
-        if (modern_apic())
+        /*
+         * Unsupported on P4 - see Intel Dev. Manual Vol. 3, Ch. 8.6.1 And not
+         * needed on AMD.
+         */
+        if (modern_apic() || boot_cpu_data.x86_vendor == X86_VENDOR_AMD)
                 return;
 
         /*
@@ -666,8 +819,8 @@ void __init sync_Arb_IDs(void)
         apic_wait_icr_idle();
 
         apic_printk(APIC_DEBUG, "Synchronizing Arb IDs.\n");
-        apic_write(APIC_ICR, APIC_DEST_ALLINC | APIC_INT_LEVELTRIG
-                                | APIC_DM_INIT);
+        apic_write(APIC_ICR, APIC_DEST_ALLINC |
+                        APIC_INT_LEVELTRIG | APIC_DM_INIT);
 }
 
 /*
@@ -684,8 +837,6 @@ void __init init_bsp_APIC(void)
         if (smp_found_config || !cpu_has_apic)
                 return;
 
-        value = apic_read(APIC_LVR);
-
         /*
          * Do not trust the local APIC being empty at bootup.
          */
@@ -697,7 +848,15 @@ void __init init_bsp_APIC(void)
         value = apic_read(APIC_SPIV);
         value &= ~APIC_VECTOR_MASK;
         value |= APIC_SPIV_APIC_ENABLED;
-        value |= APIC_SPIV_FOCUS_DISABLED;
+
+#ifdef CONFIG_X86_32
+        /* This bit is reserved on P4/Xeon and should be cleared */
+        if ((boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) &&
+            (boot_cpu_data.x86 == 15))
+                value &= ~APIC_SPIV_FOCUS_DISABLED;
+        else
+#endif
+                value |= APIC_SPIV_FOCUS_DISABLED;
         value |= SPURIOUS_APIC_VECTOR;
         apic_write(APIC_SPIV, value);
 
@@ -706,9 +865,50 @@ void __init init_bsp_APIC(void)
          */
         apic_write(APIC_LVT0, APIC_DM_EXTINT);
         value = APIC_DM_NMI;
+        if (!lapic_is_integrated())             /* 82489DX */
+                value |= APIC_LVT_LEVEL_TRIGGER;
         apic_write(APIC_LVT1, value);
 }
 
+static void __cpuinit lapic_setup_esr(void)
+{
+        unsigned long oldvalue, value, maxlvt;
+        if (lapic_is_integrated() && !esr_disable) {
+                if (esr_disable) {
+                        /*
+                         * Something untraceable is creating bad interrupts on
+                         * secondary quads ... for the moment, just leave the
+                         * ESR disabled - we can't do anything useful with the
+                         * errors anyway - mbligh
+                         */
+                        printk(KERN_INFO "Leaving ESR disabled.\n");
+                        return;
+                }
+                /* !82489DX */
+                maxlvt = lapic_get_maxlvt();
+                if (maxlvt > 3)         /* Due to the Pentium erratum 3AP. */
+                        apic_write(APIC_ESR, 0);
+                oldvalue = apic_read(APIC_ESR);
+
+                /* enables sending errors */
+                value = ERROR_APIC_VECTOR;
+                apic_write(APIC_LVTERR, value);
+                /*
+                 * spec says clear errors after enabling vector.
+                 */
+                if (maxlvt > 3)
+                        apic_write(APIC_ESR, 0);
+                value = apic_read(APIC_ESR);
+                if (value != oldvalue)
+                        apic_printk(APIC_VERBOSE, "ESR value before enabling "
+                                "vector: 0x%08lx  after: 0x%08lx\n",
+                                oldvalue, value);
+        } else {
+                printk(KERN_INFO "No ESR for 82489DX.\n");
+        }
+}
+
+
 /**
  * setup_local_APIC - setup the local APIC
  */
@@ -814,25 +1014,143 @@ void __cpuinit setup_local_APIC(void)
         preempt_enable();
 }
 
-static void __cpuinit lapic_setup_esr(void)
-{
-        unsigned maxlvt = lapic_get_maxlvt();
-
-        apic_write(APIC_LVTERR, ERROR_APIC_VECTOR);
-        /*
-         * spec says clear errors after enabling vector.
-         */
-        if (maxlvt > 3)
-                apic_write(APIC_ESR, 0);
-}
-
 void __cpuinit end_local_APIC_setup(void)
 {
         lapic_setup_esr();
+
+#ifdef CONFIG_X86_32
+        {
+                unsigned int value;
+                /* Disable the local apic timer */
+                value = apic_read(APIC_LVTT);
+                value |= (APIC_LVT_MASKED | LOCAL_TIMER_VECTOR);
+                apic_write(APIC_LVTT, value);
+        }
+#endif
+
         setup_apic_nmi_watchdog(NULL);
         apic_pm_activate();
 }
 
+void check_x2apic(void)
+{
+        int msr, msr2;
+
+        rdmsr(MSR_IA32_APICBASE, msr, msr2);
+
+        if (msr & X2APIC_ENABLE) {
+                printk("x2apic enabled by BIOS, switching to x2apic ops\n");
+                x2apic_preenabled = x2apic = 1;
+                apic_ops = &x2apic_ops;
+        }
+}
+
+void enable_x2apic(void)
+{
+        int msr, msr2;
+
+        rdmsr(MSR_IA32_APICBASE, msr, msr2);
+        if (!(msr & X2APIC_ENABLE)) {
+                printk("Enabling x2apic\n");
+                wrmsr(MSR_IA32_APICBASE, msr | X2APIC_ENABLE, 0);
+        }
+}
+
+void enable_IR_x2apic(void)
+{
+#ifdef CONFIG_INTR_REMAP
+        int ret;
+        unsigned long flags;
+
+        if (!cpu_has_x2apic)
+                return;
+
+        if (!x2apic_preenabled && disable_x2apic) {
+                printk(KERN_INFO
+                       "Skipped enabling x2apic and Interrupt-remapping "
+                       "because of nox2apic\n");
+                return;
+        }
+
+        if (x2apic_preenabled && disable_x2apic)
+                panic("Bios already enabled x2apic, can't enforce nox2apic");
+
+        if (!x2apic_preenabled && skip_ioapic_setup) {
+                printk(KERN_INFO
+                       "Skipped enabling x2apic and Interrupt-remapping "
+                       "because of skipping io-apic setup\n");
+                return;
+        }
+
+        ret = dmar_table_init();
+        if (ret) {
+                printk(KERN_INFO
+                       "dmar_table_init() failed with %d:\n", ret);
+
+                if (x2apic_preenabled)
+                        panic("x2apic enabled by bios. But IR enabling failed");
+                else
+                        printk(KERN_INFO
+                               "Not enabling x2apic,Intr-remapping\n");
+                return;
+        }
+
+        local_irq_save(flags);
+        mask_8259A();
+        save_mask_IO_APIC_setup();
+
+        ret = enable_intr_remapping(1);
+
+        if (ret && x2apic_preenabled) {
+                local_irq_restore(flags);
+                panic("x2apic enabled by bios. But IR enabling failed");
+        }
+
+        if (ret)
+                goto end;
+
+        if (!x2apic) {
+                x2apic = 1;
+                apic_ops = &x2apic_ops;
+                enable_x2apic();
+        }
+end:
+        if (ret)
+                /*
+                 * IR enabling failed
+                 */
+                restore_IO_APIC_setup();
+        else
+                reinit_intr_remapped_IO_APIC(x2apic_preenabled);
+
+        unmask_8259A();
+        local_irq_restore(flags);
+
+        if (!ret) {
+                if (!x2apic_preenabled)
+                        printk(KERN_INFO
+                               "Enabled x2apic and interrupt-remapping\n");
+                else
+                        printk(KERN_INFO
+                               "Enabled Interrupt-remapping\n");
+        } else
+                printk(KERN_ERR
+                       "Failed to enable Interrupt-remapping and x2apic\n");
+#else
+        if (!cpu_has_x2apic)
+                return;
+
+        if (x2apic_preenabled)
+                panic("x2apic enabled prior OS handover,"
+                      " enable CONFIG_INTR_REMAP");
+
+        printk(KERN_INFO "Enable CONFIG_INTR_REMAP for enabling intr-remapping "
+               " and x2apic\n");
+#endif
+
+        return;
+}
+
 /*
  * Detect and enable local APICs on non-SMP boards.
  * Original code written by Keir Fraser.
@@ -872,7 +1190,7 @@ void __init early_init_lapic_mapping(void)
          * Fetch the APIC ID of the BSP in case we have a
          * default configuration (or the MP table is broken).
          */
-        boot_cpu_physical_apicid = GET_APIC_ID(read_apic_id());
+        boot_cpu_physical_apicid = read_apic_id();
 }
 
 /**
@@ -880,6 +1198,11 @@ void __init early_init_lapic_mapping(void)
  */
 void __init init_apic_mappings(void)
 {
+        if (x2apic) {
+                boot_cpu_physical_apicid = read_apic_id();
+                return;
+        }
+
         /*
          * If no local APIC can be found then set up a fake all
          * zeroes page to simulate the local APIC and another
@@ -899,13 +1222,15 @@ void __init init_apic_mappings(void)
          * Fetch the APIC ID of the BSP in case we have a
          * default configuration (or the MP table is broken).
          */
-        boot_cpu_physical_apicid = GET_APIC_ID(read_apic_id());
+        boot_cpu_physical_apicid = read_apic_id();
 }
 
 /*
  * This initializes the IO-APIC and APIC hardware if this is
  * a UP kernel.
  */
+int apic_version[MAX_APICS];
+
 int __init APIC_init_uniprocessor(void)
 {
         if (disable_apic) {
@@ -918,6 +1243,9 @@ int __init APIC_init_uniprocessor(void)
                 return -1;
         }
 
+        enable_IR_x2apic();
+        setup_apic_routing();
+
         verify_local_APIC();
 
         connect_bsp_APIC();
@@ -1004,17 +1332,57 @@ asmlinkage void smp_error_interrupt(void)
 }
 
 /**
- *  * connect_bsp_APIC - attach the APIC to the interrupt system
- *   */
+ * connect_bsp_APIC - attach the APIC to the interrupt system
+ */
 void __init connect_bsp_APIC(void)
 {
+#ifdef CONFIG_X86_32
+        if (pic_mode) {
+                /*
+                 * Do not trust the local APIC being empty at bootup.
+                 */
+                clear_local_APIC();
+                /*
+                 * PIC mode, enable APIC mode in the IMCR, i.e.  connect BSP's
+                 * local APIC to INT and NMI lines.
+                 */
+                apic_printk(APIC_VERBOSE, "leaving PIC mode, "
+                                "enabling APIC mode.\n");
+                outb(0x70, 0x22);
+                outb(0x01, 0x23);
+        }
+#endif
         enable_apic_mode();
 }
 
+/**
+ * disconnect_bsp_APIC - detach the APIC from the interrupt system
+ * @virt_wire_setup:    indicates, whether virtual wire mode is selected
+ *
+ * Virtual wire mode is necessary to deliver legacy interrupts even when the
+ * APIC is disabled.
+ */
 void disconnect_bsp_APIC(int virt_wire_setup)
 {
+        unsigned int value;
+
+#ifdef CONFIG_X86_32
+        if (pic_mode) {
+                /*
+                 * Put the board back into PIC mode (has an effect only on
+                 * certain older boards).  Note that APIC interrupts, including
+                 * IPIs, won't work beyond this point!  The only exception are
+                 * INIT IPIs.
+                 */
+                apic_printk(APIC_VERBOSE, "disabling APIC mode, "
+                                "entering PIC mode.\n");
+                outb(0x70, 0x22);
+                outb(0x00, 0x23);
+                return;
+        }
+#endif
+
         /* Go back to Virtual Wire compatibility mode */
-        unsigned long value;
 
         /* For the spurious interrupt use vector F, and enable it */
         value = apic_read(APIC_SPIV);
@@ -1040,7 +1408,10 @@ void disconnect_bsp_APIC(int virt_wire_setup)
                 apic_write(APIC_LVT0, APIC_LVT_MASKED);
         }
 
-        /* For LVT1 make it edge triggered, active high, nmi and enabled */
+        /*
+         * For LVT1 make it edge triggered, active high,
+         * nmi and enabled
+         */
         value = apic_read(APIC_LVT1);
         value &= ~(APIC_MODE_MASK | APIC_SEND_PENDING |
                         APIC_INPUT_POLARITY | APIC_LVT_REMOTE_IRR |
@@ -1055,9 +1426,20 @@ void __cpuinit generic_processor_info(int apicid, int version)
         int cpu;
         cpumask_t tmp_map;
 
+        /*
+         * Validate version
+         */
+        if (version == 0x0) {
+                printk(KERN_WARNING "BIOS bug, APIC version is 0 for CPU#%d! "
+                                "fixing up to 0x10. (tell your hw vendor)\n",
+                                version);
+                version = 0x10;
+        }
+        apic_version[apicid] = version;
+
         if (num_processors >= NR_CPUS) {
                 printk(KERN_WARNING "WARNING: NR_CPUS limit of %i reached."
-                       " Processor ignored.\n", NR_CPUS);
+                        "  Processor ignored.\n", NR_CPUS);
                 return;
         }
 
@@ -1077,6 +1459,29 @@ void __cpuinit generic_processor_info(int apicid, int version)
         if (apicid > max_physical_apicid)
                 max_physical_apicid = apicid;
 
+#ifdef CONFIG_X86_32
+        /*
+         * Would be preferable to switch to bigsmp when CONFIG_HOTPLUG_CPU=y
+         * but we need to work other dependencies like SMP_SUSPEND etc
+         * before this can be done without some confusion.
+         * if (CPU_HOTPLUG_ENABLED || num_processors > 8)
+         *       - Ashok Raj <ashok.raj@intel.com>
+         */
+        if (max_physical_apicid >= 8) {
+                switch (boot_cpu_data.x86_vendor) {
+                case X86_VENDOR_INTEL:
+                        if (!APIC_XAPIC(version)) {
+                                def_to_bigsmp = 0;
+                                break;
+                        }
+                        /* If P4 and above fall through */
+                case X86_VENDOR_AMD:
+                        def_to_bigsmp = 1;
+                }
+        }
+#endif
+
+#if defined(CONFIG_X86_SMP) || defined(CONFIG_X86_64)
         /* are we being called early in kernel startup? */
         if (early_per_cpu_ptr(x86_cpu_to_apicid)) {
                 u16 *cpu_to_apicid = early_per_cpu_ptr(x86_cpu_to_apicid);
@@ -1088,20 +1493,28 @@ void __cpuinit generic_processor_info(int apicid, int version)
                 per_cpu(x86_cpu_to_apicid, cpu) = apicid;
                 per_cpu(x86_bios_cpu_apicid, cpu) = apicid;
         }
+#endif
 
         cpu_set(cpu, cpu_possible_map);
         cpu_set(cpu, cpu_present_map);
 }
 
+int hard_smp_processor_id(void)
+{
+        return read_apic_id();
+}
+
 /*
  * Power management
  */
 #ifdef CONFIG_PM
 
 static struct {
-        /* 'active' is true if the local APIC was enabled by us and
-           not the BIOS; this signifies that we are also responsible
-           for disabling it before entering apm/acpi suspend */
+        /*
+         * 'active' is true if the local APIC was enabled by us and
+         * not the BIOS; this signifies that we are also responsible
+         * for disabling it before entering apm/acpi suspend
+         */
         int active;
         /* r/w apic fields */
         unsigned int apic_id;
@@ -1129,7 +1542,7 @@ static int lapic_suspend(struct sys_device *dev, pm_message_t state)
 
         maxlvt = lapic_get_maxlvt();
 
-        apic_pm_state.apic_id = read_apic_id();
+        apic_pm_state.apic_id = apic_read(APIC_ID);
         apic_pm_state.apic_taskpri = apic_read(APIC_TASKPRI);
         apic_pm_state.apic_ldr = apic_read(APIC_LDR);
         apic_pm_state.apic_dfr = apic_read(APIC_DFR);
@@ -1142,10 +1555,11 @@ static int lapic_suspend(struct sys_device *dev, pm_message_t state)
         apic_pm_state.apic_lvterr = apic_read(APIC_LVTERR);
         apic_pm_state.apic_tmict = apic_read(APIC_TMICT);
         apic_pm_state.apic_tdcr = apic_read(APIC_TDCR);
-#ifdef CONFIG_X86_MCE_INTEL
+#if defined(CONFIG_X86_MCE_P4THERMAL) || defined(CONFIG_X86_MCE_INTEL)
         if (maxlvt >= 5)
                 apic_pm_state.apic_thmr = apic_read(APIC_LVTTHMR);
 #endif
+
         local_irq_save(flags);
         disable_local_APIC();
         local_irq_restore(flags);
@@ -1164,10 +1578,25 @@ static int lapic_resume(struct sys_device *dev)
         maxlvt = lapic_get_maxlvt();
 
         local_irq_save(flags);
-        rdmsr(MSR_IA32_APICBASE, l, h);
-        l &= ~MSR_IA32_APICBASE_BASE;
-        l |= MSR_IA32_APICBASE_ENABLE | mp_lapic_addr;
-        wrmsr(MSR_IA32_APICBASE, l, h);
+
+#ifdef CONFIG_X86_64
+        if (x2apic)
+                enable_x2apic();
+        else
+#endif
+        {
+                /*
+                 * Make sure the APICBASE points to the right address
+                 *
+                 * FIXME! This will be wrong if we ever support suspend on
+                 * SMP! We'll need to do this as part of the CPU restore!
+                 */
+                rdmsr(MSR_IA32_APICBASE, l, h);
+                l &= ~MSR_IA32_APICBASE_BASE;
+                l |= MSR_IA32_APICBASE_ENABLE | mp_lapic_addr;
+                wrmsr(MSR_IA32_APICBASE, l, h);
+        }
+
         apic_write(APIC_LVTERR, ERROR_APIC_VECTOR | APIC_LVT_MASKED);
         apic_write(APIC_ID, apic_pm_state.apic_id);
         apic_write(APIC_DFR, apic_pm_state.apic_dfr);
@@ -1176,7 +1605,7 @@ static int lapic_resume(struct sys_device *dev)
         apic_write(APIC_SPIV, apic_pm_state.apic_spiv);
         apic_write(APIC_LVT0, apic_pm_state.apic_lvt0);
         apic_write(APIC_LVT1, apic_pm_state.apic_lvt1);
-#ifdef CONFIG_X86_MCE_INTEL
+#if defined(CONFIG_X86_MCE_P4THERMAL) || defined(CONFIG_X86_MCE_INTEL)
         if (maxlvt >= 5)
                 apic_write(APIC_LVTTHMR, apic_pm_state.apic_thmr);
 #endif
@@ -1190,10 +1619,17 @@ static int lapic_resume(struct sys_device *dev)
         apic_write(APIC_LVTERR, apic_pm_state.apic_lvterr);
         apic_write(APIC_ESR, 0);
         apic_read(APIC_ESR);
+
         local_irq_restore(flags);
+
         return 0;
 }
 
+/*
+ * This device has no shutdown method - fully functioning local APICs
+ * are needed on every CPU up until machine_halt/restart/poweroff.
+ */
+
 static struct sysdev_class lapic_sysclass = {
         .name           = "lapic",
         .resume         = lapic_resume,
@@ -1307,31 +1743,19 @@ __cpuinit int apic_is_clustered_box(void)
         return (clusters > 2);
 }
 
-/*
- * APIC command line parameters
- */
-static int __init apic_set_verbosity(char *str)
+static __init int setup_nox2apic(char *str)
 {
-        if (str == NULL)  {
-                skip_ioapic_setup = 0;
-                ioapic_force = 1;
-                return 0;
-        }
-        if (strcmp("debug", str) == 0)
-                apic_verbosity = APIC_DEBUG;
-        else if (strcmp("verbose", str) == 0)
-                apic_verbosity = APIC_VERBOSE;
-        else {
-                printk(KERN_WARNING "APIC Verbosity level %s not recognised"
-                                " use apic=verbose or apic=debug\n", str);
-                return -EINVAL;
-        }
-
+        disable_x2apic = 1;
+        clear_cpu_cap(&boot_cpu_data, X86_FEATURE_X2APIC);
         return 0;
 }
-early_param("apic", apic_set_verbosity);
+early_param("nox2apic", setup_nox2apic);
+
 
-static __init int setup_disableapic(char *str)
+/*
+ * APIC command line parameters
+ */
+static int __init setup_disableapic(char *arg)
 {
         disable_apic = 1;
         setup_clear_cpu_cap(X86_FEATURE_APIC);
@@ -1340,9 +1764,9 @@ static __init int setup_disableapic(char *str)
 early_param("disableapic", setup_disableapic);
 
 /* same as disableapic, for compatibility */
-static __init int setup_nolapic(char *str)
+static int __init setup_nolapic(char *arg)
 {
-        return setup_disableapic(str);
+        return setup_disableapic(arg);
 }
 early_param("nolapic", setup_nolapic);
 
@@ -1353,14 +1777,19 @@ static int __init parse_lapic_timer_c2_ok(char *arg)
 }
 early_param("lapic_timer_c2_ok", parse_lapic_timer_c2_ok);
 
-static __init int setup_noapictimer(char *str)
+static int __init parse_disable_apic_timer(char *arg)
 {
-        if (str[0] != ' ' && str[0] != 0)
-                return 0;
         disable_apic_timer = 1;
-        return 1;
+        return 0;
 }
-__setup("noapictimer", setup_noapictimer);
+early_param("noapictimer", parse_disable_apic_timer);
+
+static int __init parse_nolapic_timer(char *arg)
+{
+        disable_apic_timer = 1;
+        return 0;
+}
+early_param("nolapic_timer", parse_nolapic_timer);
 
 static __init int setup_apicpmtimer(char *s)
 {
@@ -1370,6 +1799,31 @@ static __init int setup_apicpmtimer(char *s)
 }
 __setup("apicpmtimer", setup_apicpmtimer);
 
+static int __init apic_set_verbosity(char *arg)
+{
+        if (!arg)  {
+#ifdef CONFIG_X86_64
+                skip_ioapic_setup = 0;
+                ioapic_force = 1;
+                return 0;
+#endif
+                return -EINVAL;
+        }
+
+        if (strcmp("debug", arg) == 0)
+                apic_verbosity = APIC_DEBUG;
+        else if (strcmp("verbose", arg) == 0)
+                apic_verbosity = APIC_VERBOSE;
+        else {
+                printk(KERN_WARNING "APIC Verbosity level %s not recognised"
+                        " use apic=verbose or apic=debug\n", arg);
+                return -EINVAL;
+        }
+
+        return 0;
+}
+early_param("apic", apic_set_verbosity);
+
 static int __init lapic_insert_resource(void)
 {
         if (!apic_phys)
diff --git a/arch/x86/kernel/cpu/common_64.c b/arch/x86/kernel/cpu/common_64.c
index 305b465889b0..43f1aa51da5d 100644
--- a/arch/x86/kernel/cpu/common_64.c
+++ b/arch/x86/kernel/cpu/common_64.c
@@ -687,6 +687,8 @@ void __cpuinit cpu_init(void)
         barrier();
 
         check_efer();
+        if (cpu != 0 && x2apic)
+                enable_x2apic();
 
         /*
          * set up and load the per-CPU TSS
diff --git a/arch/x86/kernel/cpu/feature_names.c b/arch/x86/kernel/cpu/feature_names.c
index c9017799497c..b96b69545fbf 100644
--- a/arch/x86/kernel/cpu/feature_names.c
+++ b/arch/x86/kernel/cpu/feature_names.c
@@ -46,7 +46,7 @@ const char * const x86_cap_flags[NCAPINTS*32] = {
         /* Intel-defined (#2) */
         "pni", NULL, NULL, "monitor", "ds_cpl", "vmx", "smx", "est",
         "tm2", "ssse3", "cid", NULL, NULL, "cx16", "xtpr", NULL,
-        NULL, NULL, "dca", "sse4_1", "sse4_2", NULL, NULL, "popcnt",
+        NULL, NULL, "dca", "sse4_1", "sse4_2", "x2apic", NULL, "popcnt",
         NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
 
         /* VIA/Cyrix/Centaur-defined */
diff --git a/arch/x86/kernel/genapic_64.c b/arch/x86/kernel/genapic_64.c
index eaff0bbb1444..6c9bfc9e1e95 100644
--- a/arch/x86/kernel/genapic_64.c
+++ b/arch/x86/kernel/genapic_64.c
@@ -16,87 +16,63 @@
 #include <linux/ctype.h>
 #include <linux/init.h>
 #include <linux/hardirq.h>
+#include <linux/dmar.h>
 
 #include <asm/smp.h>
 #include <asm/ipi.h>
 #include <asm/genapic.h>
 
-#ifdef CONFIG_ACPI
-#include <acpi/acpi_bus.h>
-#endif
-
-DEFINE_PER_CPU(int, x2apic_extra_bits);
+extern struct genapic apic_flat;
+extern struct genapic apic_physflat;
+extern struct genapic apic_x2xpic_uv_x;
+extern struct genapic apic_x2apic_phys;
+extern struct genapic apic_x2apic_cluster;
 
 struct genapic __read_mostly *genapic = &apic_flat;
 
-static enum uv_system_type uv_system_type;
+static struct genapic *apic_probe[] __initdata = {
+        &apic_x2apic_uv_x,
+        &apic_x2apic_phys,
+        &apic_x2apic_cluster,
+        &apic_physflat,
+        NULL,
+};
 
 /*
  * Check the APIC IDs in bios_cpu_apicid and choose the APIC mode.
  */
 void __init setup_apic_routing(void)
 {
-        if (uv_system_type == UV_NON_UNIQUE_APIC)
-                genapic = &apic_x2apic_uv_x;
-        else
-#ifdef CONFIG_ACPI
-        /*
-         * Quirk: some x86_64 machines can only use physical APIC mode
-         * regardless of how many processors are present (x86_64 ES7000
-         * is an example).
-         */
-        if (acpi_gbl_FADT.header.revision > FADT2_REVISION_ID &&
-                        (acpi_gbl_FADT.flags & ACPI_FADT_APIC_PHYSICAL))
-                genapic = &apic_physflat;
-        else
-#endif
-
-        if (max_physical_apicid < 8)
-                genapic = &apic_flat;
-        else
-                genapic = &apic_physflat;
+        if (genapic == &apic_x2apic_phys || genapic == &apic_x2apic_cluster) {
+                if (!intr_remapping_enabled)
+                        genapic = &apic_flat;
+        }
 
-        printk(KERN_INFO "Setting APIC routing to %s\n", genapic->name);
+        if (genapic == &apic_flat) {
+                if (max_physical_apicid >= 8)
+                        genapic = &apic_physflat;
+                printk(KERN_INFO "Setting APIC routing to %s\n", genapic->name);
+        }
 }
 
 /* Same for both flat and physical. */
 
-void send_IPI_self(int vector)
+void apic_send_IPI_self(int vector)
 {
         __send_IPI_shortcut(APIC_DEST_SELF, vector, APIC_DEST_PHYSICAL);
 }
 
 int __init acpi_madt_oem_check(char *oem_id, char *oem_table_id)
 {
-        if (!strcmp(oem_id, "SGI")) {
-                if (!strcmp(oem_table_id, "UVL"))
-                        uv_system_type = UV_LEGACY_APIC;
-                else if (!strcmp(oem_table_id, "UVX"))
-                        uv_system_type = UV_X2APIC;
-                else if (!strcmp(oem_table_id, "UVH"))
-                        uv_system_type = UV_NON_UNIQUE_APIC;
+        int i;
+
+        for (i = 0; apic_probe[i]; ++i) {
+                if (apic_probe[i]->acpi_madt_oem_check(oem_id, oem_table_id)) {
+                        genapic = apic_probe[i];
+                        printk(KERN_INFO "Setting APIC routing to %s.\n",
+                                genapic->name);
+                        return 1;
+                }
         }
         return 0;
 }
-
-unsigned int read_apic_id(void)
-{
-        unsigned int id;
-
-        WARN_ON(preemptible() && num_online_cpus() > 1);
-        id = apic_read(APIC_ID);
-        if (uv_system_type >= UV_X2APIC)
-                id  |= __get_cpu_var(x2apic_extra_bits);
-        return id;
-}
-
-enum uv_system_type get_uv_system_type(void)
-{
-        return uv_system_type;
-}
-
-int is_uv_system(void)
-{
-        return uv_system_type != UV_NONE;
-}
-EXPORT_SYMBOL_GPL(is_uv_system);
diff --git a/arch/x86/kernel/genapic_flat_64.c b/arch/x86/kernel/genapic_flat_64.c
index 786548a62d38..9eca5ba7a6b1 100644
--- a/arch/x86/kernel/genapic_flat_64.c
+++ b/arch/x86/kernel/genapic_flat_64.c
@@ -15,9 +15,20 @@
 #include <linux/kernel.h>
 #include <linux/ctype.h>
 #include <linux/init.h>
+#include <linux/hardirq.h>
 #include <asm/smp.h>
 #include <asm/ipi.h>
 #include <asm/genapic.h>
+#include <mach_apicdef.h>
+
+#ifdef CONFIG_ACPI
+#include <acpi/acpi_bus.h>
+#endif
+
+static int __init flat_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
+{
+        return 1;
+}
 
 static cpumask_t flat_target_cpus(void)
 {
@@ -95,9 +106,33 @@ static void flat_send_IPI_all(int vector)
                 __send_IPI_shortcut(APIC_DEST_ALLINC, vector, APIC_DEST_LOGICAL);
 }
 
+static unsigned int get_apic_id(unsigned long x)
+{
+        unsigned int id;
+
+        id = (((x)>>24) & 0xFFu);
+        return id;
+}
+
+static unsigned long set_apic_id(unsigned int id)
+{
+        unsigned long x;
+
+        x = ((id & 0xFFu)<<24);
+        return x;
+}
+
+static unsigned int read_xapic_id(void)
+{
+        unsigned int id;
+
+        id = get_apic_id(apic_read(APIC_ID));
+        return id;
+}
+
 static int flat_apic_id_registered(void)
 {
-        return physid_isset(GET_APIC_ID(read_apic_id()), phys_cpu_present_map);
+        return physid_isset(read_xapic_id(), phys_cpu_present_map);
 }
 
 static unsigned int flat_cpu_mask_to_apicid(cpumask_t cpumask)
@@ -112,6 +147,7 @@ static unsigned int phys_pkg_id(int index_msb)
 
 struct genapic apic_flat =  {
         .name = "flat",
+        .acpi_madt_oem_check = flat_acpi_madt_oem_check,
         .int_delivery_mode = dest_LowestPrio,
         .int_dest_mode = (APIC_DEST_LOGICAL != 0),
         .target_cpus = flat_target_cpus,
@@ -121,8 +157,12 @@ struct genapic apic_flat =  {
         .send_IPI_all = flat_send_IPI_all,
         .send_IPI_allbutself = flat_send_IPI_allbutself,
         .send_IPI_mask = flat_send_IPI_mask,
+        .send_IPI_self = apic_send_IPI_self,
         .cpu_mask_to_apicid = flat_cpu_mask_to_apicid,
         .phys_pkg_id = phys_pkg_id,
+        .get_apic_id = get_apic_id,
+        .set_apic_id = set_apic_id,
+        .apic_id_mask = (0xFFu<<24),
 };
 
 /*
@@ -130,6 +170,21 @@ struct genapic apic_flat =  {
  * We cannot use logical delivery in this case because the mask
  * overflows, so use physical mode.
  */
+static int __init physflat_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
+{
+#ifdef CONFIG_ACPI
+        /*
+         * Quirk: some x86_64 machines can only use physical APIC mode
+         * regardless of how many processors are present (x86_64 ES7000
+         * is an example).
+         */
+        if (acpi_gbl_FADT.header.revision > FADT2_REVISION_ID &&
+                (acpi_gbl_FADT.flags & ACPI_FADT_APIC_PHYSICAL))
+                return 1;
+#endif
+
+        return 0;
+}
 
 static cpumask_t physflat_target_cpus(void)
 {
@@ -176,6 +231,7 @@ static unsigned int physflat_cpu_mask_to_apicid(cpumask_t cpumask)
 
 struct genapic apic_physflat =  {
         .name = "physical flat",
+        .acpi_madt_oem_check = physflat_acpi_madt_oem_check,
         .int_delivery_mode = dest_Fixed,
         .int_dest_mode = (APIC_DEST_PHYSICAL != 0),
         .target_cpus = physflat_target_cpus,
@@ -185,6 +241,10 @@ struct genapic apic_physflat =  {
         .send_IPI_all = physflat_send_IPI_all,
         .send_IPI_allbutself = physflat_send_IPI_allbutself,
         .send_IPI_mask = physflat_send_IPI_mask,
+        .send_IPI_self = apic_send_IPI_self,
         .cpu_mask_to_apicid = physflat_cpu_mask_to_apicid,
         .phys_pkg_id = phys_pkg_id,
+        .get_apic_id = get_apic_id,
+        .set_apic_id = set_apic_id,
+        .apic_id_mask = (0xFFu<<24),
 };
diff --git a/arch/x86/kernel/genx2apic_cluster.c b/arch/x86/kernel/genx2apic_cluster.c
new file mode 100644
index 000000000000..fed9f68efd66
--- /dev/null
+++ b/arch/x86/kernel/genx2apic_cluster.c
@@ -0,0 +1,164 @@
+#include <linux/threads.h>
+#include <linux/cpumask.h>
+#include <linux/string.h>
+#include <linux/kernel.h>
+#include <linux/ctype.h>
+#include <linux/init.h>
+#include <linux/dmar.h>
+
+#include <asm/smp.h>
+#include <asm/ipi.h>
+#include <asm/genapic.h>
+
+DEFINE_PER_CPU(u32, x86_cpu_to_logical_apicid);
+
+static int __init x2apic_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
+{
+        if (cpu_has_x2apic)
+                return 1;
+
+        return 0;
+}
+
+/* Start with all IRQs pointing to boot CPU.  IRQ balancing will shift them. */
+
+static cpumask_t x2apic_target_cpus(void)
+{
+        return cpumask_of_cpu(0);
+}
+
+/*
+ * for now each logical cpu is in its own vector allocation domain.
+ */
+static cpumask_t x2apic_vector_allocation_domain(int cpu)
+{
+        cpumask_t domain = CPU_MASK_NONE;
+        cpu_set(cpu, domain);
+        return domain;
+}
+
+static void __x2apic_send_IPI_dest(unsigned int apicid, int vector,
+                                   unsigned int dest)
+{
+        unsigned long cfg;
+
+        cfg = __prepare_ICR(0, vector, dest);
+
+        /*
+         * send the IPI.
+         */
+        x2apic_icr_write(cfg, apicid);
+}
+
+/*
+ * for now, we send the IPI's one by one in the cpumask.
+ * TBD: Based on the cpu mask, we can send the IPI's to the cluster group
+ * at once. We have 16 cpu's in a cluster. This will minimize IPI register
+ * writes.
+ */
+static void x2apic_send_IPI_mask(cpumask_t mask, int vector)
+{
+        unsigned long flags;
+        unsigned long query_cpu;
+
+        local_irq_save(flags);
+        for_each_cpu_mask(query_cpu, mask) {
+                __x2apic_send_IPI_dest(per_cpu(x86_cpu_to_logical_apicid, query_cpu),
+                                       vector, APIC_DEST_LOGICAL);
+        }
+        local_irq_restore(flags);
+}
+
+static void x2apic_send_IPI_allbutself(int vector)
+{
+        cpumask_t mask = cpu_online_map;
+
+        cpu_clear(smp_processor_id(), mask);
+
+        if (!cpus_empty(mask))
+                x2apic_send_IPI_mask(mask, vector);
+}
+
+static void x2apic_send_IPI_all(int vector)
+{
+        x2apic_send_IPI_mask(cpu_online_map, vector);
+}
+
+static int x2apic_apic_id_registered(void)
+{
+        return 1;
+}
+
+static unsigned int x2apic_cpu_mask_to_apicid(cpumask_t cpumask)
+{
+        int cpu;
+
+        /*
+         * We're using fixed IRQ delivery, can only return one phys APIC ID.
+         * May as well be the first.
+         */
+        cpu = first_cpu(cpumask);
+        if ((unsigned)cpu < NR_CPUS)
+                return per_cpu(x86_cpu_to_logical_apicid, cpu);
+        else
+                return BAD_APICID;
+}
+
+static unsigned int get_apic_id(unsigned long x)
+{
+        unsigned int id;
+
+        id = x;
+        return id;
+}
+
+static unsigned long set_apic_id(unsigned int id)
+{
+        unsigned long x;
+
+        x = id;
+        return x;
+}
+
+static unsigned int x2apic_read_id(void)
+{
+        return apic_read(APIC_ID);
+}
+
+static unsigned int phys_pkg_id(int index_msb)
+{
+        return x2apic_read_id() >> index_msb;
+}
+
+static void x2apic_send_IPI_self(int vector)
+{
+        apic_write(APIC_SELF_IPI, vector);
+}
+
+static void init_x2apic_ldr(void)
+{
+        int cpu = smp_processor_id();
+
+        per_cpu(x86_cpu_to_logical_apicid, cpu) = apic_read(APIC_LDR);
+        return;
+}
+
+struct genapic apic_x2apic_cluster = {
+        .name = "cluster x2apic",
+        .acpi_madt_oem_check = x2apic_acpi_madt_oem_check,
+        .int_delivery_mode = dest_LowestPrio,
+        .int_dest_mode = (APIC_DEST_LOGICAL != 0),
+        .target_cpus = x2apic_target_cpus,
+        .vector_allocation_domain = x2apic_vector_allocation_domain,
+        .apic_id_registered = x2apic_apic_id_registered,
+        .init_apic_ldr = init_x2apic_ldr,
+        .send_IPI_all = x2apic_send_IPI_all,
+        .send_IPI_allbutself = x2apic_send_IPI_allbutself,
+        .send_IPI_mask = x2apic_send_IPI_mask,
+        .send_IPI_self = x2apic_send_IPI_self,
+        .cpu_mask_to_apicid = x2apic_cpu_mask_to_apicid,
+        .phys_pkg_id = phys_pkg_id,
+        .get_apic_id = get_apic_id,
+        .set_apic_id = set_apic_id,
+        .apic_id_mask = (0xFFFFFFFFu),
+};
diff --git a/arch/x86/kernel/genx2apic_phys.c b/arch/x86/kernel/genx2apic_phys.c
new file mode 100644
index 000000000000..958d537b4cc9
--- /dev/null
+++ b/arch/x86/kernel/genx2apic_phys.c
@@ -0,0 +1,159 @@
+#include <linux/threads.h>
+#include <linux/cpumask.h>
+#include <linux/string.h>
+#include <linux/kernel.h>
+#include <linux/ctype.h>
+#include <linux/init.h>
+#include <linux/dmar.h>
+
+#include <asm/smp.h>
+#include <asm/ipi.h>
+#include <asm/genapic.h>
+
+static int x2apic_phys;
+
+static int set_x2apic_phys_mode(char *arg)
+{
+        x2apic_phys = 1;
+        return 0;
+}
+early_param("x2apic_phys", set_x2apic_phys_mode);
+
+static int __init x2apic_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
+{
+        if (cpu_has_x2apic && x2apic_phys)
+                return 1;
+
+        return 0;
+}
+
+/* Start with all IRQs pointing to boot CPU.  IRQ balancing will shift them. */
+
+static cpumask_t x2apic_target_cpus(void)
+{
+        return cpumask_of_cpu(0);
+}
+
+static cpumask_t x2apic_vector_allocation_domain(int cpu)
+{
+        cpumask_t domain = CPU_MASK_NONE;
+        cpu_set(cpu, domain);
+        return domain;
+}
+
+static void __x2apic_send_IPI_dest(unsigned int apicid, int vector,
+                                   unsigned int dest)
+{
+        unsigned long cfg;
+
+        cfg = __prepare_ICR(0, vector, dest);
+
+        /*
+         * send the IPI.
+         */
+        x2apic_icr_write(cfg, apicid);
+}
+
+static void x2apic_send_IPI_mask(cpumask_t mask, int vector)
+{
+        unsigned long flags;
+        unsigned long query_cpu;
+
+        local_irq_save(flags);
+        for_each_cpu_mask(query_cpu, mask) {
+                __x2apic_send_IPI_dest(per_cpu(x86_cpu_to_apicid, query_cpu),
+                                       vector, APIC_DEST_PHYSICAL);
+        }
+        local_irq_restore(flags);
+}
+
+static void x2apic_send_IPI_allbutself(int vector)
+{
+        cpumask_t mask = cpu_online_map;
+
+        cpu_clear(smp_processor_id(), mask);
+
+        if (!cpus_empty(mask))
+                x2apic_send_IPI_mask(mask, vector);
+}
+
+static void x2apic_send_IPI_all(int vector)
+{
+        x2apic_send_IPI_mask(cpu_online_map, vector);
+}
+
+static int x2apic_apic_id_registered(void)
+{
+        return 1;
+}
+
+static unsigned int x2apic_cpu_mask_to_apicid(cpumask_t cpumask)
+{
+        int cpu;
+
+        /*
+         * We're using fixed IRQ delivery, can only return one phys APIC ID.
+         * May as well be the first.
+         */
+        cpu = first_cpu(cpumask);
+        if ((unsigned)cpu < NR_CPUS)
+                return per_cpu(x86_cpu_to_apicid, cpu);
+        else
+                return BAD_APICID;
+}
+
+static unsigned int get_apic_id(unsigned long x)
+{
+        unsigned int id;
+
+        id = x;
+        return id;
+}
+
+static unsigned long set_apic_id(unsigned int id)
+{
+        unsigned long x;
+
+        x = id;
+        return x;
+}
+
+static unsigned int x2apic_read_id(void)
+{
+        return apic_read(APIC_ID);
+}
+
+static unsigned int phys_pkg_id(int index_msb)
+{
+        return x2apic_read_id() >> index_msb;
+}
+
+void x2apic_send_IPI_self(int vector)
+{
+        apic_write(APIC_SELF_IPI, vector);
+}
+
+void init_x2apic_ldr(void)
+{
+        return;
+}
+
+struct genapic apic_x2apic_phys = {
+        .name = "physical x2apic",
+        .acpi_madt_oem_check = x2apic_acpi_madt_oem_check,
+        .int_delivery_mode = dest_Fixed,
+        .int_dest_mode = (APIC_DEST_PHYSICAL != 0),
+        .target_cpus = x2apic_target_cpus,
+        .vector_allocation_domain = x2apic_vector_allocation_domain,
+        .apic_id_registered = x2apic_apic_id_registered,
+        .init_apic_ldr = init_x2apic_ldr,
+        .send_IPI_all = x2apic_send_IPI_all,
+        .send_IPI_allbutself = x2apic_send_IPI_allbutself,
+        .send_IPI_mask = x2apic_send_IPI_mask,
+        .send_IPI_self = x2apic_send_IPI_self,
+        .cpu_mask_to_apicid = x2apic_cpu_mask_to_apicid,
+        .phys_pkg_id = phys_pkg_id,
+        .get_apic_id = get_apic_id,
+        .set_apic_id = set_apic_id,
+        .apic_id_mask = (0xFFFFFFFFu),
+};
diff --git a/arch/x86/kernel/genx2apic_uv_x.c b/arch/x86/kernel/genx2apic_uv_x.c
index bfa837cb16be..ae2ffc8a400c 100644
--- a/arch/x86/kernel/genx2apic_uv_x.c
+++ b/arch/x86/kernel/genx2apic_uv_x.c
@@ -12,12 +12,12 @@
 #include <linux/threads.h>
 #include <linux/cpumask.h>
 #include <linux/string.h>
-#include <linux/kernel.h>
 #include <linux/ctype.h>
 #include <linux/init.h>
 #include <linux/sched.h>
 #include <linux/bootmem.h>
 #include <linux/module.h>
+#include <linux/hardirq.h>
 #include <asm/smp.h>
 #include <asm/ipi.h>
 #include <asm/genapic.h>
@@ -26,6 +26,36 @@
 #include <asm/uv/uv_hub.h>
 #include <asm/uv/bios.h>
 
+DEFINE_PER_CPU(int, x2apic_extra_bits);
+
+static enum uv_system_type uv_system_type;
+
+static int __init uv_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
+{
+        if (!strcmp(oem_id, "SGI")) {
+                if (!strcmp(oem_table_id, "UVL"))
+                        uv_system_type = UV_LEGACY_APIC;
+                else if (!strcmp(oem_table_id, "UVX"))
+                        uv_system_type = UV_X2APIC;
+                else if (!strcmp(oem_table_id, "UVH")) {
+                        uv_system_type = UV_NON_UNIQUE_APIC;
+                        return 1;
+                }
+        }
+        return 0;
+}
+
+enum uv_system_type get_uv_system_type(void)
+{
+        return uv_system_type;
+}
+
+int is_uv_system(void)
+{
+        return uv_system_type != UV_NONE;
+}
+EXPORT_SYMBOL_GPL(is_uv_system);
+
 DEFINE_PER_CPU(struct uv_hub_info_s, __uv_hub_info);
 EXPORT_PER_CPU_SYMBOL_GPL(__uv_hub_info);
 
@@ -123,6 +153,10 @@ static int uv_apic_id_registered(void)
         return 1;
 }
 
+static void uv_init_apic_ldr(void)
+{
+}
+
 static unsigned int uv_cpu_mask_to_apicid(cpumask_t cpumask)
 {
         int cpu;
@@ -138,9 +172,34 @@ static unsigned int uv_cpu_mask_to_apicid(cpumask_t cpumask)
                 return BAD_APICID;
 }
 
+static unsigned int get_apic_id(unsigned long x)
+{
+        unsigned int id;
+
+        WARN_ON(preemptible() && num_online_cpus() > 1);
+        id = x | __get_cpu_var(x2apic_extra_bits);
+
+        return id;
+}
+
+static unsigned long set_apic_id(unsigned int id)
+{
+        unsigned long x;
+
+        /* maskout x2apic_extra_bits ? */
+        x = id;
+        return x;
+}
+
+static unsigned int uv_read_apic_id(void)
+{
+
+        return get_apic_id(apic_read(APIC_ID));
+}
+
 static unsigned int phys_pkg_id(int index_msb)
 {
-        return GET_APIC_ID(read_apic_id()) >> index_msb;
+        return uv_read_apic_id() >> index_msb;
 }
 
 #ifdef ZZZ              /* Needs x2apic patch */
@@ -152,17 +211,22 @@ static void uv_send_IPI_self(int vector)
 
 struct genapic apic_x2apic_uv_x = {
         .name = "UV large system",
+        .acpi_madt_oem_check = uv_acpi_madt_oem_check,
         .int_delivery_mode = dest_Fixed,
         .int_dest_mode = (APIC_DEST_PHYSICAL != 0),
         .target_cpus = uv_target_cpus,
         .vector_allocation_domain = uv_vector_allocation_domain,/* Fixme ZZZ */
         .apic_id_registered = uv_apic_id_registered,
+        .init_apic_ldr = uv_init_apic_ldr,
         .send_IPI_all = uv_send_IPI_all,
         .send_IPI_allbutself = uv_send_IPI_allbutself,
         .send_IPI_mask = uv_send_IPI_mask,
         /* ZZZ.send_IPI_self = uv_send_IPI_self, */
         .cpu_mask_to_apicid = uv_cpu_mask_to_apicid,
         .phys_pkg_id = phys_pkg_id,     /* Fixme ZZZ */
+        .get_apic_id = get_apic_id,
+        .set_apic_id = set_apic_id,
+        .apic_id_mask = (0xFFFFFFFFu),
 };
 
 static __cpuinit void set_x2apic_extra_bits(int pnode)
@@ -401,3 +465,5 @@ void __cpuinit uv_cpu_init(void)
         if (get_uv_system_type() == UV_NON_UNIQUE_APIC)
                 set_x2apic_extra_bits(uv_hub_info->pnode);
 }
+
+
diff --git a/arch/x86/kernel/i8259.c b/arch/x86/kernel/i8259.c
index dc92b49d9204..4b8a53d841f7 100644
--- a/arch/x86/kernel/i8259.c
+++ b/arch/x86/kernel/i8259.c
@@ -282,6 +282,30 @@ static int __init i8259A_init_sysfs(void)
 
 device_initcall(i8259A_init_sysfs);
 
+void mask_8259A(void)
+{
+        unsigned long flags;
+
+        spin_lock_irqsave(&i8259A_lock, flags);
+
+        outb(0xff, PIC_MASTER_IMR);     /* mask all of 8259A-1 */
+        outb(0xff, PIC_SLAVE_IMR);      /* mask all of 8259A-2 */
+
+        spin_unlock_irqrestore(&i8259A_lock, flags);
+}
+
+void unmask_8259A(void)
+{
+        unsigned long flags;
+
+        spin_lock_irqsave(&i8259A_lock, flags);
+
+        outb(cached_master_mask, PIC_MASTER_IMR); /* restore master IRQ mask */
+        outb(cached_slave_mask, PIC_SLAVE_IMR);   /* restore slave IRQ mask */
+
+        spin_unlock_irqrestore(&i8259A_lock, flags);
+}
+
 void init_8259A(int auto_eoi)
 {
         unsigned long flags;
diff --git a/arch/x86/kernel/io_apic_32.c b/arch/x86/kernel/io_apic_32.c
index 09cddb57bec4..e710289f673e 100644
--- a/arch/x86/kernel/io_apic_32.c
+++ b/arch/x86/kernel/io_apic_32.c
@@ -46,10 +46,13 @@
 #include <asm/nmi.h>
 #include <asm/msidef.h>
 #include <asm/hypertransport.h>
+#include <asm/setup.h>
 
 #include <mach_apic.h>
 #include <mach_apicdef.h>
 
+#define __apicdebuginit(type) static type __init
+
 int (*ioapic_renumber_irq)(int ioapic, int irq);
 atomic_t irq_mis_count;
 
@@ -1341,7 +1344,8 @@ static void __init setup_timer_IRQ0_pin(unsigned int apic, unsigned int pin,
         ioapic_write_entry(apic, pin, entry);
 }
 
-void __init print_IO_APIC(void)
+
+__apicdebuginit(void) print_IO_APIC(void)
 {
         int apic, i;
         union IO_APIC_reg_00 reg_00;
@@ -1456,9 +1460,7 @@ void __init print_IO_APIC(void)
         return;
 }
 
-#if 0
-
-static void print_APIC_bitfield(int base)
+__apicdebuginit(void) print_APIC_bitfield(int base)
 {
         unsigned int v;
         int i, j;
@@ -1479,9 +1481,10 @@ static void print_APIC_bitfield(int base)
         }
 }
 
-void /*__init*/ print_local_APIC(void *dummy)
+__apicdebuginit(void) print_local_APIC(void *dummy)
 {
         unsigned int v, ver, maxlvt;
+        u64 icr;
 
         if (apic_verbosity == APIC_QUIET)
                 return;
@@ -1490,7 +1493,7 @@ void /*__init*/ print_local_APIC(void *dummy)
                 smp_processor_id(), hard_smp_processor_id());
         v = apic_read(APIC_ID);
         printk(KERN_INFO "... APIC ID:      %08x (%01x)\n", v,
-                        GET_APIC_ID(read_apic_id()));
+                        GET_APIC_ID(v));
         v = apic_read(APIC_LVR);
         printk(KERN_INFO "... APIC VERSION: %08x\n", v);
         ver = GET_APIC_VERSION(v);
@@ -1532,10 +1535,9 @@ void /*__init*/ print_local_APIC(void *dummy)
                 printk(KERN_DEBUG "... APIC ESR: %08x\n", v);
         }
 
-        v = apic_read(APIC_ICR);
-        printk(KERN_DEBUG "... APIC ICR: %08x\n", v);
-        v = apic_read(APIC_ICR2);
-        printk(KERN_DEBUG "... APIC ICR2: %08x\n", v);
+        icr = apic_icr_read();
+        printk(KERN_DEBUG "... APIC ICR: %08x\n", icr);
+        printk(KERN_DEBUG "... APIC ICR2: %08x\n", icr >> 32);
 
         v = apic_read(APIC_LVTT);
         printk(KERN_DEBUG "... APIC LVTT: %08x\n", v);
@@ -1563,12 +1565,12 @@ void /*__init*/ print_local_APIC(void *dummy)
         printk("\n");
 }
 
-void print_all_local_APICs(void)
+__apicdebuginit(void) print_all_local_APICs(void)
 {
         on_each_cpu(print_local_APIC, NULL, 1);
 }
 
-void /*__init*/ print_PIC(void)
+__apicdebuginit(void) print_PIC(void)
 {
         unsigned int v;
         unsigned long flags;
@@ -1600,7 +1602,17 @@ void /*__init*/ print_PIC(void)
         printk(KERN_DEBUG "... PIC ELCR: %04x\n", v);
 }
 
-#endif  /*  0  */
+__apicdebuginit(int) print_all_ICs(void)
+{
+        print_PIC();
+        print_all_local_APICs();
+        print_IO_APIC();
+
+        return 0;
+}
+
+fs_initcall(print_all_ICs);
+
 
 static void __init enable_IO_APIC(void)
 {
@@ -1698,8 +1710,7 @@ void disable_IO_APIC(void)
                 entry.dest_mode       = 0; /* Physical */
                 entry.delivery_mode   = dest_ExtINT; /* ExtInt */
                 entry.vector          = 0;
-                entry.dest.physical.physical_dest =
-                                        GET_APIC_ID(read_apic_id());
+                entry.dest.physical.physical_dest = read_apic_id();
 
                 /*
                  * Add it to the IO-APIC irq-routing table:
@@ -1725,10 +1736,8 @@ static void __init setup_ioapic_ids_from_mpc(void)
         unsigned char old_id;
         unsigned long flags;
 
-#ifdef CONFIG_X86_NUMAQ
-        if (found_numaq)
+        if (x86_quirks->setup_ioapic_ids && x86_quirks->setup_ioapic_ids())
                 return;
-#endif
 
         /*
          * Don't check I/O APIC IDs for xAPIC systems.  They have
@@ -2329,8 +2338,6 @@ void __init setup_IO_APIC(void)
         setup_IO_APIC_irqs();
         init_IO_APIC_traps();
         check_timer();
-        if (!acpi_ioapic)
-                print_IO_APIC();
 }
 
 /*
diff --git a/arch/x86/kernel/io_apic_64.c b/arch/x86/kernel/io_apic_64.c
index 61a83b70c18f..a1bec2969c6a 100644
--- a/arch/x86/kernel/io_apic_64.c
+++ b/arch/x86/kernel/io_apic_64.c
@@ -37,6 +37,7 @@
 #include <acpi/acpi_bus.h>
 #endif
 #include <linux/bootmem.h>
+#include <linux/dmar.h>
 
 #include <asm/idle.h>
 #include <asm/io.h>
@@ -49,10 +50,13 @@
 #include <asm/nmi.h>
 #include <asm/msidef.h>
 #include <asm/hypertransport.h>
+#include <asm/irq_remapping.h>
 
 #include <mach_ipi.h>
 #include <mach_apic.h>
 
+#define __apicdebuginit(type) static type __init
+
 struct irq_cfg {
         cpumask_t domain;
         cpumask_t old_domain;
@@ -87,8 +91,6 @@ int first_system_vector = 0xfe;
 
 char system_vectors[NR_VECTORS] = { [0 ... NR_VECTORS-1] = SYS_VECTOR_FREE};
 
-#define __apicdebuginit  __init
-
 int sis_apic_bug; /* not actually supported, dummy for compile */
 
 static int no_timer_check;
@@ -108,6 +110,9 @@ static DEFINE_SPINLOCK(vector_lock);
  */
 int nr_ioapic_registers[MAX_IO_APICS];
 
+/* I/O APIC RTE contents at the OS boot up */
+struct IO_APIC_route_entry *early_ioapic_entries[MAX_IO_APICS];
+
 /* I/O APIC entries */
 struct mp_config_ioapic mp_ioapics[MAX_IO_APICS];
 int nr_ioapics;
@@ -303,7 +308,12 @@ static void __target_IO_APIC_irq(unsigned int irq, unsigned int dest, u8 vector)
                 pin = entry->pin;
                 if (pin == -1)
                         break;
-                io_apic_write(apic, 0x11 + pin*2, dest);
+                /*
+                 * With interrupt-remapping, destination information comes
+                 * from interrupt-remapping table entry.
+                 */
+                if (!irq_remapped(irq))
+                        io_apic_write(apic, 0x11 + pin*2, dest);
                 reg = io_apic_read(apic, 0x10 + pin*2);
                 reg &= ~IO_APIC_REDIR_VECTOR_MASK;
                 reg |= vector;
@@ -440,6 +450,69 @@ static void clear_IO_APIC (void)
                         clear_IO_APIC_pin(apic, pin);
 }
 
+/*
+ * Saves and masks all the unmasked IO-APIC RTE's
+ */
+int save_mask_IO_APIC_setup(void)
+{
+        union IO_APIC_reg_01 reg_01;
+        unsigned long flags;
+        int apic, pin;
+
+        /*
+         * The number of IO-APIC IRQ registers (== #pins):
+         */
+        for (apic = 0; apic < nr_ioapics; apic++) {
+                spin_lock_irqsave(&ioapic_lock, flags);
+                reg_01.raw = io_apic_read(apic, 1);
+                spin_unlock_irqrestore(&ioapic_lock, flags);
+                nr_ioapic_registers[apic] = reg_01.bits.entries+1;
+        }
+
+        for (apic = 0; apic < nr_ioapics; apic++) {
+                early_ioapic_entries[apic] =
+                        kzalloc(sizeof(struct IO_APIC_route_entry) *
+                                nr_ioapic_registers[apic], GFP_KERNEL);
+                if (!early_ioapic_entries[apic])
+                        return -ENOMEM;
+        }
+
+        for (apic = 0; apic < nr_ioapics; apic++)
+                for (pin = 0; pin < nr_ioapic_registers[apic]; pin++) {
+                        struct IO_APIC_route_entry entry;
+
+                        entry = early_ioapic_entries[apic][pin] =
+                                ioapic_read_entry(apic, pin);
+                        if (!entry.mask) {
+                                entry.mask = 1;
+                                ioapic_write_entry(apic, pin, entry);
+                        }
+                }
+        return 0;
+}
+
+void restore_IO_APIC_setup(void)
+{
+        int apic, pin;
+
+        for (apic = 0; apic < nr_ioapics; apic++)
+                for (pin = 0; pin < nr_ioapic_registers[apic]; pin++)
+                        ioapic_write_entry(apic, pin,
+                                           early_ioapic_entries[apic][pin]);
+}
+
+void reinit_intr_remapped_IO_APIC(int intr_remapping)
+{
+        /*
+         * for now plain restore of previous settings.
+         * TBD: In the case of OS enabling interrupt-remapping,
+         * IO-APIC RTE's need to be setup to point to interrupt-remapping
+         * table entries. for now, do a plain restore, and wait for
+         * the setup_IO_APIC_irqs() to do proper initialization.
+         */
+        restore_IO_APIC_setup();
+}
+
 int skip_ioapic_setup;
 int ioapic_force;
 
@@ -839,18 +912,98 @@ void __setup_vector_irq(int cpu)
 }
 
 static struct irq_chip ioapic_chip;
+#ifdef CONFIG_INTR_REMAP
+static struct irq_chip ir_ioapic_chip;
+#endif
 
 static void ioapic_register_intr(int irq, unsigned long trigger)
 {
-        if (trigger) {
+        if (trigger)
                 irq_desc[irq].status |= IRQ_LEVEL;
-                set_irq_chip_and_handler_name(irq, &ioapic_chip,
-                                              handle_fasteoi_irq, "fasteoi");
-        } else {
+        else
                 irq_desc[irq].status &= ~IRQ_LEVEL;
+
+#ifdef CONFIG_INTR_REMAP
+        if (irq_remapped(irq)) {
+                irq_desc[irq].status |= IRQ_MOVE_PCNTXT;
+                if (trigger)
+                        set_irq_chip_and_handler_name(irq, &ir_ioapic_chip,
+                                                      handle_fasteoi_irq,
+                                                     "fasteoi");
+                else
+                        set_irq_chip_and_handler_name(irq, &ir_ioapic_chip,
+                                                      handle_edge_irq, "edge");
+                return;
+        }
+#endif
+        if (trigger)
+                set_irq_chip_and_handler_name(irq, &ioapic_chip,
+                                              handle_fasteoi_irq,
+                                              "fasteoi");
+        else
                 set_irq_chip_and_handler_name(irq, &ioapic_chip,
                                               handle_edge_irq, "edge");
+}
+
+static int setup_ioapic_entry(int apic, int irq,
+                              struct IO_APIC_route_entry *entry,
+                              unsigned int destination, int trigger,
+                              int polarity, int vector)
+{
+        /*
+         * add it to the IO-APIC irq-routing table:
+         */
+        memset(entry,0,sizeof(*entry));
+
+#ifdef CONFIG_INTR_REMAP
+        if (intr_remapping_enabled) {
+                struct intel_iommu *iommu = map_ioapic_to_ir(apic);
+                struct irte irte;
+                struct IR_IO_APIC_route_entry *ir_entry =
+                        (struct IR_IO_APIC_route_entry *) entry;
+                int index;
+
+                if (!iommu)
+                        panic("No mapping iommu for ioapic %d\n", apic);
+
+                index = alloc_irte(iommu, irq, 1);
+                if (index < 0)
+                        panic("Failed to allocate IRTE for ioapic %d\n", apic);
+
+                memset(&irte, 0, sizeof(irte));
+
+                irte.present = 1;
+                irte.dst_mode = INT_DEST_MODE;
+                irte.trigger_mode = trigger;
+                irte.dlvry_mode = INT_DELIVERY_MODE;
+                irte.vector = vector;
+                irte.dest_id = IRTE_DEST(destination);
+
+                modify_irte(irq, &irte);
+
+                ir_entry->index2 = (index >> 15) & 0x1;
+                ir_entry->zero = 0;
+                ir_entry->format = 1;
+                ir_entry->index = (index & 0x7fff);
+        } else
+#endif
+        {
+                entry->delivery_mode = INT_DELIVERY_MODE;
+                entry->dest_mode = INT_DEST_MODE;
+                entry->dest = destination;
         }
+
+        entry->mask = 0;                                /* enable IRQ */
+        entry->trigger = trigger;
+        entry->polarity = polarity;
+        entry->vector = vector;
+
+        /* Mask level triggered irqs.
+         * Use IRQ_DELAYED_DISABLE for edge triggered irqs.
+         */
+        if (trigger)
+                entry->mask = 1;
+        return 0;
 }
 
 static void setup_IO_APIC_irq(int apic, int pin, unsigned int irq,
@@ -875,24 +1028,15 @@ static void setup_IO_APIC_irq(int apic, int pin, unsigned int irq,
                     apic, mp_ioapics[apic].mp_apicid, pin, cfg->vector,
                     irq, trigger, polarity);
 
-        /*
-         * add it to the IO-APIC irq-routing table:
-         */
-        memset(&entry,0,sizeof(entry));
-
-        entry.delivery_mode = INT_DELIVERY_MODE;
-        entry.dest_mode = INT_DEST_MODE;
-        entry.dest = cpu_mask_to_apicid(mask);
-        entry.mask = 0;                         /* enable IRQ */
-        entry.trigger = trigger;
-        entry.polarity = polarity;
-        entry.vector = cfg->vector;
 
-        /* Mask level triggered irqs.
-         * Use IRQ_DELAYED_DISABLE for edge triggered irqs.
-         */
-        if (trigger)
-                entry.mask = 1;
+        if (setup_ioapic_entry(mp_ioapics[apic].mp_apicid, irq, &entry,
+                               cpu_mask_to_apicid(mask), trigger, polarity,
+                               cfg->vector)) {
+                printk("Failed to setup ioapic entry for ioapic  %d, pin %d\n",
+                       mp_ioapics[apic].mp_apicid, pin);
+                __clear_irq_vector(irq);
+                return;
+        }
 
         ioapic_register_intr(irq, trigger);
         if (irq < 16)
@@ -944,6 +1088,9 @@ static void __init setup_timer_IRQ0_pin(unsigned int apic, unsigned int pin,
 {
         struct IO_APIC_route_entry entry;
 
+        if (intr_remapping_enabled)
+                return;
+
         memset(&entry, 0, sizeof(entry));
 
         /*
@@ -970,7 +1117,8 @@ static void __init setup_timer_IRQ0_pin(unsigned int apic, unsigned int pin,
         ioapic_write_entry(apic, pin, entry);
 }
 
-void __apicdebuginit print_IO_APIC(void)
+
+__apicdebuginit(void) print_IO_APIC(void)
 {
         int apic, i;
         union IO_APIC_reg_00 reg_00;
@@ -1064,9 +1212,7 @@ void __apicdebuginit print_IO_APIC(void)
         return;
 }
 
-#if 0
-
-static __apicdebuginit void print_APIC_bitfield (int base)
+__apicdebuginit(void) print_APIC_bitfield(int base)
 {
         unsigned int v;
         int i, j;
@@ -1087,9 +1233,10 @@ static __apicdebuginit void print_APIC_bitfield (int base)
         }
 }
 
-void __apicdebuginit print_local_APIC(void * dummy)
+__apicdebuginit(void) print_local_APIC(void *dummy)
 {
         unsigned int v, ver, maxlvt;
+        unsigned long icr;
 
         if (apic_verbosity == APIC_QUIET)
                 return;
@@ -1097,7 +1244,7 @@ void __apicdebuginit print_local_APIC(void * dummy)
         printk("\n" KERN_DEBUG "printing local APIC contents on CPU#%d/%d:\n",
                 smp_processor_id(), hard_smp_processor_id());
         v = apic_read(APIC_ID);
-        printk(KERN_INFO "... APIC ID:      %08x (%01x)\n", v, GET_APIC_ID(read_apic_id()));
+        printk(KERN_INFO "... APIC ID:      %08x (%01x)\n", v, read_apic_id());
         v = apic_read(APIC_LVR);
         printk(KERN_INFO "... APIC VERSION: %08x\n", v);
         ver = GET_APIC_VERSION(v);
@@ -1133,10 +1280,9 @@ void __apicdebuginit print_local_APIC(void * dummy)
         v = apic_read(APIC_ESR);
         printk(KERN_DEBUG "... APIC ESR: %08x\n", v);
 
-        v = apic_read(APIC_ICR);
-        printk(KERN_DEBUG "... APIC ICR: %08x\n", v);
-        v = apic_read(APIC_ICR2);
-        printk(KERN_DEBUG "... APIC ICR2: %08x\n", v);
+        icr = apic_icr_read();
+        printk(KERN_DEBUG "... APIC ICR: %08x\n", icr);
+        printk(KERN_DEBUG "... APIC ICR2: %08x\n", icr >> 32);
 
         v = apic_read(APIC_LVTT);
         printk(KERN_DEBUG "... APIC LVTT: %08x\n", v);
@@ -1164,12 +1310,12 @@ void __apicdebuginit print_local_APIC(void * dummy)
         printk("\n");
 }
 
-void print_all_local_APICs (void)
+__apicdebuginit(void) print_all_local_APICs(void)
 {
         on_each_cpu(print_local_APIC, NULL, 1);
 }
 
-void __apicdebuginit print_PIC(void)
+__apicdebuginit(void) print_PIC(void)
 {
         unsigned int v;
         unsigned long flags;
@@ -1201,7 +1347,17 @@ void __apicdebuginit print_PIC(void)
         printk(KERN_DEBUG "... PIC ELCR: %04x\n", v);
 }
 
-#endif  /*  0  */
+__apicdebuginit(int) print_all_ICs(void)
+{
+        print_PIC();
+        print_all_local_APICs();
+        print_IO_APIC();
+
+        return 0;
+}
+
+fs_initcall(print_all_ICs);
+
 
 void __init enable_IO_APIC(void)
 {
@@ -1291,7 +1447,7 @@ void disable_IO_APIC(void)
                 entry.dest_mode       = 0; /* Physical */
                 entry.delivery_mode   = dest_ExtINT; /* ExtInt */
                 entry.vector          = 0;
-                entry.dest          = GET_APIC_ID(read_apic_id());
+                entry.dest            = read_apic_id();
 
                 /*
                  * Add it to the IO-APIC irq-routing table:
@@ -1397,6 +1553,147 @@ static int ioapic_retrigger_irq(unsigned int irq)
  */
 
 #ifdef CONFIG_SMP
+
+#ifdef CONFIG_INTR_REMAP
+static void ir_irq_migration(struct work_struct *work);
+
+static DECLARE_DELAYED_WORK(ir_migration_work, ir_irq_migration);
+
+/*
+ * Migrate the IO-APIC irq in the presence of intr-remapping.
+ *
+ * For edge triggered, irq migration is a simple atomic update(of vector
+ * and cpu destination) of IRTE and flush the hardware cache.
+ *
+ * For level triggered, we need to modify the io-apic RTE aswell with the update
+ * vector information, along with modifying IRTE with vector and destination.
+ * So irq migration for level triggered is little  bit more complex compared to
+ * edge triggered migration. But the good news is, we use the same algorithm
+ * for level triggered migration as we have today, only difference being,
+ * we now initiate the irq migration from process context instead of the
+ * interrupt context.
+ *
+ * In future, when we do a directed EOI (combined with cpu EOI broadcast
+ * suppression) to the IO-APIC, level triggered irq migration will also be
+ * as simple as edge triggered migration and we can do the irq migration
+ * with a simple atomic update to IO-APIC RTE.
+ */
+static void migrate_ioapic_irq(int irq, cpumask_t mask)
+{
+        struct irq_cfg *cfg = irq_cfg + irq;
+        struct irq_desc *desc = irq_desc + irq;
+        cpumask_t tmp, cleanup_mask;
+        struct irte irte;
+        int modify_ioapic_rte = desc->status & IRQ_LEVEL;
+        unsigned int dest;
+        unsigned long flags;
+
+        cpus_and(tmp, mask, cpu_online_map);
+        if (cpus_empty(tmp))
+                return;
+
+        if (get_irte(irq, &irte))
+                return;
+
+        if (assign_irq_vector(irq, mask))
+                return;
+
+        cpus_and(tmp, cfg->domain, mask);
+        dest = cpu_mask_to_apicid(tmp);
+
+        if (modify_ioapic_rte) {
+                spin_lock_irqsave(&ioapic_lock, flags);
+                __target_IO_APIC_irq(irq, dest, cfg->vector);
+                spin_unlock_irqrestore(&ioapic_lock, flags);
+        }
+
+        irte.vector = cfg->vector;
+        irte.dest_id = IRTE_DEST(dest);
+
+        /*
+         * Modified the IRTE and flushes the Interrupt entry cache.
+         */
+        modify_irte(irq, &irte);
+
+        if (cfg->move_in_progress) {
+                cpus_and(cleanup_mask, cfg->old_domain, cpu_online_map);
+                cfg->move_cleanup_count = cpus_weight(cleanup_mask);
+                send_IPI_mask(cleanup_mask, IRQ_MOVE_CLEANUP_VECTOR);
+                cfg->move_in_progress = 0;
+        }
+
+        irq_desc[irq].affinity = mask;
+}
+
+static int migrate_irq_remapped_level(int irq)
+{
+        int ret = -1;
+
+        mask_IO_APIC_irq(irq);
+
+        if (io_apic_level_ack_pending(irq)) {
+                /*
+                 * Interrupt in progress. Migrating irq now will change the
+                 * vector information in the IO-APIC RTE and that will confuse
+                 * the EOI broadcast performed by cpu.
+                 * So, delay the irq migration to the next instance.
+                 */
+                schedule_delayed_work(&ir_migration_work, 1);
+                goto unmask;
+        }
+
+        /* everthing is clear. we have right of way */
+        migrate_ioapic_irq(irq, irq_desc[irq].pending_mask);
+
+        ret = 0;
+        irq_desc[irq].status &= ~IRQ_MOVE_PENDING;
+        cpus_clear(irq_desc[irq].pending_mask);
+
+unmask:
+        unmask_IO_APIC_irq(irq);
+        return ret;
+}
+
+static void ir_irq_migration(struct work_struct *work)
+{
+        int irq;
+
+        for (irq = 0; irq < NR_IRQS; irq++) {
+                struct irq_desc *desc = irq_desc + irq;
+                if (desc->status & IRQ_MOVE_PENDING) {
+                        unsigned long flags;
+
+                        spin_lock_irqsave(&desc->lock, flags);
+                        if (!desc->chip->set_affinity ||
+                            !(desc->status & IRQ_MOVE_PENDING)) {
+                                desc->status &= ~IRQ_MOVE_PENDING;
+                                spin_unlock_irqrestore(&desc->lock, flags);
+                                continue;
+                        }
+
+                        desc->chip->set_affinity(irq,
+                                                 irq_desc[irq].pending_mask);
+                        spin_unlock_irqrestore(&desc->lock, flags);
+                }
+        }
+}
+
+/*
+ * Migrates the IRQ destination in the process context.
+ */
+static void set_ir_ioapic_affinity_irq(unsigned int irq, cpumask_t mask)
+{
+        if (irq_desc[irq].status & IRQ_LEVEL) {
+                irq_desc[irq].status |= IRQ_MOVE_PENDING;
+                irq_desc[irq].pending_mask = mask;
+                migrate_irq_remapped_level(irq);
+                return;
+        }
+
+        migrate_ioapic_irq(irq, mask);
+}
+#endif
+
 asmlinkage void smp_irq_move_cleanup_interrupt(void)
 {
         unsigned vector, me;
@@ -1453,6 +1750,17 @@ static void irq_complete_move(unsigned int irq)
 #else
 static inline void irq_complete_move(unsigned int irq) {}
 #endif
+#ifdef CONFIG_INTR_REMAP
+static void ack_x2apic_level(unsigned int irq)
+{
+        ack_x2APIC_irq();
+}
+
+static void ack_x2apic_edge(unsigned int irq)
+{
+        ack_x2APIC_irq();
+}
+#endif
 
 static void ack_apic_edge(unsigned int irq)
 {
@@ -1527,6 +1835,21 @@ static struct irq_chip ioapic_chip __read_mostly = {
         .retrigger      = ioapic_retrigger_irq,
 };
 
+#ifdef CONFIG_INTR_REMAP
+static struct irq_chip ir_ioapic_chip __read_mostly = {
+        .name           = "IR-IO-APIC",
+        .startup        = startup_ioapic_irq,
+        .mask           = mask_IO_APIC_irq,
+        .unmask         = unmask_IO_APIC_irq,
+        .ack            = ack_x2apic_edge,
+        .eoi            = ack_x2apic_level,
+#ifdef CONFIG_SMP
+        .set_affinity   = set_ir_ioapic_affinity_irq,
+#endif
+        .retrigger      = ioapic_retrigger_irq,
+};
+#endif
+
 static inline void init_IO_APIC_traps(void)
 {
         int irq;
@@ -1712,6 +2035,8 @@ static inline void __init check_timer(void)
          * 8259A.
          */
         if (pin1 == -1) {
+                if (intr_remapping_enabled)
+                        panic("BIOS bug: timer not connected to IO-APIC");
                 pin1 = pin2;
                 apic1 = apic2;
                 no_pin1 = 1;
@@ -1738,6 +2063,8 @@ static inline void __init check_timer(void)
                                 clear_IO_APIC_pin(0, pin1);
                         goto out;
                 }
+                if (intr_remapping_enabled)
+                        panic("timer doesn't work through Interrupt-remapped IO-APIC");
                 clear_IO_APIC_pin(apic1, pin1);
                 if (!no_pin1)
                         apic_printk(APIC_QUIET, KERN_ERR "..MP-BIOS bug: "
@@ -1854,8 +2181,6 @@ void __init setup_IO_APIC(void)
         setup_IO_APIC_irqs();
         init_IO_APIC_traps();
         check_timer();
-        if (!acpi_ioapic)
-                print_IO_APIC();
 }
 
 struct sysfs_ioapic_data {
@@ -1977,6 +2302,9 @@ void destroy_irq(unsigned int irq)
 
         dynamic_irq_cleanup(irq);
 
+#ifdef CONFIG_INTR_REMAP
+        free_irte(irq);
+#endif
         spin_lock_irqsave(&vector_lock, flags);
         __clear_irq_vector(irq);
         spin_unlock_irqrestore(&vector_lock, flags);
@@ -1995,11 +2323,42 @@ static int msi_compose_msg(struct pci_dev *pdev, unsigned int irq, struct msi_ms
 
         tmp = TARGET_CPUS;
         err = assign_irq_vector(irq, tmp);
-        if (!err) {
-                cpus_and(tmp, cfg->domain, tmp);
-                dest = cpu_mask_to_apicid(tmp);
+        if (err)
+                return err;
+
+        cpus_and(tmp, cfg->domain, tmp);
+        dest = cpu_mask_to_apicid(tmp);
+
+#ifdef CONFIG_INTR_REMAP
+        if (irq_remapped(irq)) {
+                struct irte irte;
+                int ir_index;
+                u16 sub_handle;
+
+                ir_index = map_irq_to_irte_handle(irq, &sub_handle);
+                BUG_ON(ir_index == -1);
+
+                memset (&irte, 0, sizeof(irte));
+
+                irte.present = 1;
+                irte.dst_mode = INT_DEST_MODE;
+                irte.trigger_mode = 0; /* edge */
+                irte.dlvry_mode = INT_DELIVERY_MODE;
+                irte.vector = cfg->vector;
+                irte.dest_id = IRTE_DEST(dest);
+
+                modify_irte(irq, &irte);
 
                 msg->address_hi = MSI_ADDR_BASE_HI;
+                msg->data = sub_handle;
+                msg->address_lo = MSI_ADDR_BASE_LO | MSI_ADDR_IR_EXT_INT |
+                                  MSI_ADDR_IR_SHV |
+                                  MSI_ADDR_IR_INDEX1(ir_index) |
+                                  MSI_ADDR_IR_INDEX2(ir_index);
+        } else
+#endif
+        {
+                msg->address_hi = MSI_ADDR_BASE_HI;
                 msg->address_lo =
                         MSI_ADDR_BASE_LO |
                         ((INT_DEST_MODE == 0) ?
@@ -2049,6 +2408,55 @@ static void set_msi_irq_affinity(unsigned int irq, cpumask_t mask)
         write_msi_msg(irq, &msg);
         irq_desc[irq].affinity = mask;
 }
+
+#ifdef CONFIG_INTR_REMAP
+/*
+ * Migrate the MSI irq to another cpumask. This migration is
+ * done in the process context using interrupt-remapping hardware.
+ */
+static void ir_set_msi_irq_affinity(unsigned int irq, cpumask_t mask)
+{
+        struct irq_cfg *cfg = irq_cfg + irq;
+        unsigned int dest;
+        cpumask_t tmp, cleanup_mask;
+        struct irte irte;
+
+        cpus_and(tmp, mask, cpu_online_map);
+        if (cpus_empty(tmp))
+                return;
+
+        if (get_irte(irq, &irte))
+                return;
+
+        if (assign_irq_vector(irq, mask))
+                return;
+
+        cpus_and(tmp, cfg->domain, mask);
+        dest = cpu_mask_to_apicid(tmp);
+
+        irte.vector = cfg->vector;
+        irte.dest_id = IRTE_DEST(dest);
+
+        /*
+         * atomically update the IRTE with the new destination and vector.
+         */
+        modify_irte(irq, &irte);
+
+        /*
+         * After this point, all the interrupts will start arriving
+         * at the new destination. So, time to cleanup the previous
+         * vector allocation.
+         */
+        if (cfg->move_in_progress) {
+                cpus_and(cleanup_mask, cfg->old_domain, cpu_online_map);
+                cfg->move_cleanup_count = cpus_weight(cleanup_mask);
+                send_IPI_mask(cleanup_mask, IRQ_MOVE_CLEANUP_VECTOR);
+                cfg->move_in_progress = 0;
+        }
+
+        irq_desc[irq].affinity = mask;
+}
+#endif
 #endif /* CONFIG_SMP */
 
 /*
@@ -2066,26 +2474,157 @@ static struct irq_chip msi_chip = {
         .retrigger      = ioapic_retrigger_irq,
 };
 
-int arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc)
+#ifdef CONFIG_INTR_REMAP
+static struct irq_chip msi_ir_chip = {
+        .name           = "IR-PCI-MSI",
+        .unmask         = unmask_msi_irq,
+        .mask           = mask_msi_irq,
+        .ack            = ack_x2apic_edge,
+#ifdef CONFIG_SMP
+        .set_affinity   = ir_set_msi_irq_affinity,
+#endif
+        .retrigger      = ioapic_retrigger_irq,
+};
+
+/*
+ * Map the PCI dev to the corresponding remapping hardware unit
+ * and allocate 'nvec' consecutive interrupt-remapping table entries
+ * in it.
+ */
+static int msi_alloc_irte(struct pci_dev *dev, int irq, int nvec)
 {
+        struct intel_iommu *iommu;
+        int index;
+
+        iommu = map_dev_to_ir(dev);
+        if (!iommu) {
+                printk(KERN_ERR
+                       "Unable to map PCI %s to iommu\n", pci_name(dev));
+                return -ENOENT;
+        }
+
+        index = alloc_irte(iommu, irq, nvec);
+        if (index < 0) {
+                printk(KERN_ERR
+                       "Unable to allocate %d IRTE for PCI %s\n", nvec,
+                        pci_name(dev));
+                return -ENOSPC;
+        }
+        return index;
+}
+#endif
+
+static int setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc, int irq)
+{
+        int ret;
         struct msi_msg msg;
+
+        ret = msi_compose_msg(dev, irq, &msg);
+        if (ret < 0)
+                return ret;
+
+        set_irq_msi(irq, desc);
+        write_msi_msg(irq, &msg);
+
+#ifdef CONFIG_INTR_REMAP
+        if (irq_remapped(irq)) {
+                struct irq_desc *desc = irq_desc + irq;
+                /*
+                 * irq migration in process context
+                 */
+                desc->status |= IRQ_MOVE_PCNTXT;
+                set_irq_chip_and_handler_name(irq, &msi_ir_chip, handle_edge_irq, "edge");
+        } else
+#endif
+                set_irq_chip_and_handler_name(irq, &msi_chip, handle_edge_irq, "edge");
+
+        return 0;
+}
+
+int arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc)
+{
         int irq, ret;
+
         irq = create_irq();
         if (irq < 0)
                 return irq;
 
-        ret = msi_compose_msg(dev, irq, &msg);
+#ifdef CONFIG_INTR_REMAP
+        if (!intr_remapping_enabled)
+                goto no_ir;
+
+        ret = msi_alloc_irte(dev, irq, 1);
+        if (ret < 0)
+                goto error;
+no_ir:
+#endif
+        ret = setup_msi_irq(dev, desc, irq);
         if (ret < 0) {
                 destroy_irq(irq);
                 return ret;
         }
+        return 0;
 
-        set_irq_msi(irq, desc);
-        write_msi_msg(irq, &msg);
+#ifdef CONFIG_INTR_REMAP
+error:
+        destroy_irq(irq);
+        return ret;
+#endif
+}
 
-        set_irq_chip_and_handler_name(irq, &msi_chip, handle_edge_irq, "edge");
+int arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
+{
+        int irq, ret, sub_handle;
+        struct msi_desc *desc;
+#ifdef CONFIG_INTR_REMAP
+        struct intel_iommu *iommu = 0;
+        int index = 0;
+#endif
+
+        sub_handle = 0;
+        list_for_each_entry(desc, &dev->msi_list, list) {
+                irq = create_irq();
+                if (irq < 0)
+                        return irq;
+#ifdef CONFIG_INTR_REMAP
+                if (!intr_remapping_enabled)
+                        goto no_ir;
 
+                if (!sub_handle) {
+                        /*
+                         * allocate the consecutive block of IRTE's
+                         * for 'nvec'
+                         */
+                        index = msi_alloc_irte(dev, irq, nvec);
+                        if (index < 0) {
+                                ret = index;
+                                goto error;
+                        }
+                } else {
+                        iommu = map_dev_to_ir(dev);
+                        if (!iommu) {
+                                ret = -ENOENT;
+                                goto error;
+                        }
+                        /*
+                         * setup the mapping between the irq and the IRTE
+                         * base index, the sub_handle pointing to the
+                         * appropriate interrupt remap table entry.
+                         */
+                        set_irte_irq(irq, iommu, index, sub_handle);
+                }
+no_ir:
+#endif
+                ret = setup_msi_irq(dev, desc, irq);
+                if (ret < 0)
+                        goto error;
+                sub_handle++;
+        }
         return 0;
+
+error:
+        destroy_irq(irq);
+        return ret;
 }
 
 void arch_teardown_msi_irq(unsigned int irq)
@@ -2333,6 +2872,10 @@ void __init setup_ioapic_dest(void)
                                 setup_IO_APIC_irq(ioapic, pin, irq,
                                                   irq_trigger(irq_entry),
                                                   irq_polarity(irq_entry));
+#ifdef CONFIG_INTR_REMAP
+                        else if (intr_remapping_enabled)
+                                set_ir_ioapic_affinity_irq(irq, TARGET_CPUS);
+#endif
                         else
                                 set_ioapic_affinity_irq(irq, TARGET_CPUS);
                 }
diff --git a/arch/x86/kernel/irqinit_32.c b/arch/x86/kernel/irqinit_32.c
index d66914287ee1..9200a1e2752d 100644
--- a/arch/x86/kernel/irqinit_32.c
+++ b/arch/x86/kernel/irqinit_32.c
@@ -74,6 +74,15 @@ void __init init_ISA_irqs (void)
         }
 }
 
+/*
+ * IRQ2 is cascade interrupt to second interrupt controller
+ */
+static struct irqaction irq2 = {
+        .handler = no_action,
+        .mask = CPU_MASK_NONE,
+        .name = "cascade",
+};
+
 /* Overridden in paravirt.c */
 void init_IRQ(void) __attribute__((weak, alias("native_init_IRQ")));
 
@@ -98,6 +107,46 @@ void __init native_init_IRQ(void)
                         set_intr_gate(vector, interrupt[i]);
         }
 
+#if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_SMP)
+        /*
+         * IRQ0 must be given a fixed assignment and initialized,
+         * because it's used before the IO-APIC is set up.
+         */
+        set_intr_gate(FIRST_DEVICE_VECTOR, interrupt[0]);
+
+        /*
+         * The reschedule interrupt is a CPU-to-CPU reschedule-helper
+         * IPI, driven by wakeup.
+         */
+        alloc_intr_gate(RESCHEDULE_VECTOR, reschedule_interrupt);
+
+        /* IPI for invalidation */
+        alloc_intr_gate(INVALIDATE_TLB_VECTOR, invalidate_interrupt);
+
+        /* IPI for generic function call */
+        alloc_intr_gate(CALL_FUNCTION_VECTOR, call_function_interrupt);
+
+        /* IPI for single call function */
+        set_intr_gate(CALL_FUNCTION_SINGLE_VECTOR, call_function_single_interrupt);
+#endif
+
+#ifdef CONFIG_X86_LOCAL_APIC
+        /* self generated IPI for local APIC timer */
+        alloc_intr_gate(LOCAL_TIMER_VECTOR, apic_timer_interrupt);
+
+        /* IPI vectors for APIC spurious and error interrupts */
+        alloc_intr_gate(SPURIOUS_APIC_VECTOR, spurious_interrupt);
+        alloc_intr_gate(ERROR_APIC_VECTOR, error_interrupt);
+#endif
+
+#if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86_MCE_P4THERMAL)
+        /* thermal monitor LVT interrupt */
+        alloc_intr_gate(THERMAL_APIC_VECTOR, thermal_interrupt);
+#endif
+
+        if (!acpi_ioapic)
+                setup_irq(2, &irq2);
+
         /* setup after call gates are initialised (usually add in
          * the architecture specific gates)
          */
diff --git a/arch/x86/kernel/mpparse.c b/arch/x86/kernel/mpparse.c
index b3fb430725cb..f98f4e1dba09 100644
--- a/arch/x86/kernel/mpparse.c
+++ b/arch/x86/kernel/mpparse.c
@@ -397,7 +397,9 @@ static int __init smp_read_mpc(struct mp_config_table *mpc, unsigned early)
        generic_bigsmp_probe();
 #endif
 
+#ifdef CONFIG_X86_32
         setup_apic_routing();
+#endif
         if (!num_processors)
                 printk(KERN_ERR "MPTABLE: no processors registered!\n");
         return num_processors;
diff --git a/arch/x86/kernel/numaq_32.c b/arch/x86/kernel/numaq_32.c
index eecc8c18f010..4caff39078e0 100644
--- a/arch/x86/kernel/numaq_32.c
+++ b/arch/x86/kernel/numaq_32.c
@@ -229,6 +229,12 @@ static void __init smp_read_mpc_oem(struct mp_config_oemtable *oemtable,
         }
 }
 
+static int __init numaq_setup_ioapic_ids(void)
+{
+        /* so can skip it */
+        return 1;
+}
+
 static struct x86_quirks numaq_x86_quirks __initdata = {
         .arch_pre_time_init     = numaq_pre_time_init,
         .arch_time_init         = NULL,
@@ -243,6 +249,7 @@ static struct x86_quirks numaq_x86_quirks __initdata = {
         .mpc_oem_bus_info       = mpc_oem_bus_info,
         .mpc_oem_pci_bus        = mpc_oem_pci_bus,
         .smp_read_mpc_oem       = smp_read_mpc_oem,
+        .setup_ioapic_ids       = numaq_setup_ioapic_ids,
 };
 
 void numaq_mps_oem_check(struct mp_config_table *mpc, char *oem,
diff --git a/arch/x86/kernel/paravirt.c b/arch/x86/kernel/paravirt.c
index e2f43768723a..6b0bb73998dd 100644
--- a/arch/x86/kernel/paravirt.c
+++ b/arch/x86/kernel/paravirt.c
@@ -374,8 +374,6 @@ struct pv_cpu_ops pv_cpu_ops = {
 
 struct pv_apic_ops pv_apic_ops = {
 #ifdef CONFIG_X86_LOCAL_APIC
-        .apic_write = native_apic_write,
-        .apic_read = native_apic_read,
         .setup_boot_clock = setup_boot_APIC_clock,
         .setup_secondary_clock = setup_secondary_APIC_clock,
         .startup_ipi_hook = paravirt_nop,
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index 141efab52400..46c98efbbf8d 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -758,6 +758,8 @@ void __init setup_arch(char **cmdline_p)
 #else
         num_physpages = max_pfn;
 
+        if (cpu_has_x2apic)
+                check_x2apic();
 
         /* How many end-of-memory variables you have, grandma! */
         /* need this before calling reserve_initrd */
diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index 45531e3ba194..2ff0bbcd5bd1 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -123,7 +123,6 @@ EXPORT_PER_CPU_SYMBOL(cpu_info);
 
 static atomic_t init_deasserted;
 
-static int boot_cpu_logical_apicid;
 
 /* representing cpus for which sibling maps can be computed */
 static cpumask_t cpu_sibling_setup_map;
@@ -165,6 +164,8 @@ static void unmap_cpu_to_node(int cpu)
 #endif
 
 #ifdef CONFIG_X86_32
+static int boot_cpu_logical_apicid;
+
 u8 cpu_2_logical_apicid[NR_CPUS] __read_mostly =
                                         { [0 ... NR_CPUS-1] = BAD_APICID };
 
@@ -210,7 +211,7 @@ static void __cpuinit smp_callin(void)
         /*
          * (This works even if the APIC is not enabled.)
          */
-        phys_id = GET_APIC_ID(read_apic_id());
+        phys_id = read_apic_id();
         cpuid = smp_processor_id();
         if (cpu_isset(cpuid, cpu_callin_map)) {
                 panic("%s: phys CPU#%d, CPU#%d already present??\n", __func__,
@@ -550,8 +551,7 @@ static inline void __inquire_remote_apic(int apicid)
                         printk(KERN_CONT
                                "a previous APIC delivery may have failed\n");
 
-                apic_write(APIC_ICR2, SET_APIC_DEST_FIELD(apicid));
-                apic_write(APIC_ICR, APIC_DM_REMRD | regs[i]);
+                apic_icr_write(APIC_DM_REMRD | regs[i], apicid);
 
                 timeout = 0;
                 do {
@@ -583,11 +583,9 @@ wakeup_secondary_cpu(int logical_apicid, unsigned long start_eip)
         int maxlvt;
 
         /* Target chip */
-        apic_write(APIC_ICR2, SET_APIC_DEST_FIELD(logical_apicid));
-
         /* Boot on the stack */
         /* Kick the second */
-        apic_write(APIC_ICR, APIC_DM_NMI | APIC_DEST_LOGICAL);
+        apic_icr_write(APIC_DM_NMI | APIC_DEST_LOGICAL, logical_apicid);
 
         pr_debug("Waiting for send to finish...\n");
         send_status = safe_apic_wait_icr_idle();
@@ -640,13 +638,11 @@ wakeup_secondary_cpu(int phys_apicid, unsigned long start_eip)
         /*
          * Turn INIT on target chip
          */
-        apic_write(APIC_ICR2, SET_APIC_DEST_FIELD(phys_apicid));
-
         /*
          * Send IPI
          */
-        apic_write(APIC_ICR,
-                   APIC_INT_LEVELTRIG | APIC_INT_ASSERT | APIC_DM_INIT);
+        apic_icr_write(APIC_INT_LEVELTRIG | APIC_INT_ASSERT | APIC_DM_INIT,
+                       phys_apicid);
 
         pr_debug("Waiting for send to finish...\n");
         send_status = safe_apic_wait_icr_idle();
@@ -656,10 +652,8 @@ wakeup_secondary_cpu(int phys_apicid, unsigned long start_eip)
         pr_debug("Deasserting INIT.\n");
 
         /* Target chip */
-        apic_write(APIC_ICR2, SET_APIC_DEST_FIELD(phys_apicid));
-
         /* Send IPI */
-        apic_write(APIC_ICR, APIC_INT_LEVELTRIG | APIC_DM_INIT);
+        apic_icr_write(APIC_INT_LEVELTRIG | APIC_DM_INIT, phys_apicid);
 
         pr_debug("Waiting for send to finish...\n");
         send_status = safe_apic_wait_icr_idle();
@@ -702,11 +696,10 @@ wakeup_secondary_cpu(int phys_apicid, unsigned long start_eip)
                  */
 
                 /* Target chip */
-                apic_write(APIC_ICR2, SET_APIC_DEST_FIELD(phys_apicid));
-
                 /* Boot on the stack */
                 /* Kick the second */
-                apic_write(APIC_ICR, APIC_DM_STARTUP | (start_eip >> 12));
+                apic_icr_write(APIC_DM_STARTUP | (start_eip >> 12),
+                               phys_apicid);
 
                 /*
                  * Give the other CPU some time to accept the IPI.
@@ -1175,10 +1168,17 @@ void __init native_smp_prepare_cpus(unsigned int max_cpus)
          * Setup boot CPU information
          */
         smp_store_cpu_info(0); /* Final full version of the data */
+#ifdef CONFIG_X86_32
         boot_cpu_logical_apicid = logical_smp_processor_id();
+#endif
         current_thread_info()->cpu = 0;  /* needed? */
         set_cpu_sibling_map(0);
 
+#ifdef CONFIG_X86_64
+        enable_IR_x2apic();
+        setup_apic_routing();
+#endif
+
         if (smp_sanity_check(max_cpus) < 0) {
                 printk(KERN_INFO "SMP disabled\n");
                 disable_smp();
@@ -1186,9 +1186,9 @@ void __init native_smp_prepare_cpus(unsigned int max_cpus)
         }
 
         preempt_disable();
-        if (GET_APIC_ID(read_apic_id()) != boot_cpu_physical_apicid) {
+        if (read_apic_id() != boot_cpu_physical_apicid) {
                 panic("Boot APIC ID in local APIC unexpected (%d vs %d)",
-                     GET_APIC_ID(read_apic_id()), boot_cpu_physical_apicid);
+                     read_apic_id(), boot_cpu_physical_apicid);
                 /* Or can we switch back to PIC here? */
         }
         preempt_enable();
diff --git a/arch/x86/kernel/summit_32.c b/arch/x86/kernel/summit_32.c
index d67ce5f044ba..7b987852e876 100644
--- a/arch/x86/kernel/summit_32.c
+++ b/arch/x86/kernel/summit_32.c
@@ -30,7 +30,7 @@
 #include <linux/init.h>
 #include <asm/io.h>
 #include <asm/bios_ebda.h>
-#include <asm/mach-summit/mach_mpparse.h>
+#include <asm/summit/mpparse.h>
 
 static struct rio_table_hdr *rio_table_hdr __initdata;
 static struct scal_detail   *scal_devs[MAX_NUMNODES] __initdata;
diff --git a/arch/x86/kernel/vmi_32.c b/arch/x86/kernel/vmi_32.c
index 8c9ad02af5a2..8b6c393ab9fd 100644
--- a/arch/x86/kernel/vmi_32.c
+++ b/arch/x86/kernel/vmi_32.c
@@ -905,8 +905,8 @@ static inline int __init activate_vmi(void)
 #endif
 
 #ifdef CONFIG_X86_LOCAL_APIC
-        para_fill(pv_apic_ops.apic_read, APICRead);
-        para_fill(pv_apic_ops.apic_write, APICWrite);
+       para_fill(apic_ops->read, APICRead);
+       para_fill(apic_ops->write, APICWrite);
 #endif
 
         /*
diff --git a/arch/x86/lguest/boot.c b/arch/x86/lguest/boot.c
index d9249a882aa5..65f0b8a47bed 100644
--- a/arch/x86/lguest/boot.c
+++ b/arch/x86/lguest/boot.c
@@ -55,6 +55,7 @@
 #include <linux/lguest_launcher.h>
 #include <linux/virtio_console.h>
 #include <linux/pm.h>
+#include <asm/apic.h>
 #include <asm/lguest.h>
 #include <asm/paravirt.h>
 #include <asm/param.h>
@@ -783,14 +784,44 @@ static void lguest_wbinvd(void)
  * code qualifies for Advanced.  It will also never interrupt anything.  It
  * does, however, allow us to get through the Linux boot code. */
 #ifdef CONFIG_X86_LOCAL_APIC
-static void lguest_apic_write(unsigned long reg, u32 v)
+static void lguest_apic_write(u32 reg, u32 v)
 {
 }
 
-static u32 lguest_apic_read(unsigned long reg)
+static u32 lguest_apic_read(u32 reg)
 {
         return 0;
 }
+
+static u64 lguest_apic_icr_read(void)
+{
+        return 0;
+}
+
+static void lguest_apic_icr_write(u32 low, u32 id)
+{
+        /* Warn to see if there's any stray references */
+        WARN_ON(1);
+}
+
+static void lguest_apic_wait_icr_idle(void)
+{
+        return;
+}
+
+static u32 lguest_apic_safe_wait_icr_idle(void)
+{
+        return 0;
+}
+
+static struct apic_ops lguest_basic_apic_ops = {
+        .read = lguest_apic_read,
+        .write = lguest_apic_write,
+        .icr_read = lguest_apic_icr_read,
+        .icr_write = lguest_apic_icr_write,
+        .wait_icr_idle = lguest_apic_wait_icr_idle,
+        .safe_wait_icr_idle = lguest_apic_safe_wait_icr_idle,
+};
 #endif
 
 /* STOP!  Until an interrupt comes in. */
@@ -990,8 +1021,7 @@ __init void lguest_init(void)
 
 #ifdef CONFIG_X86_LOCAL_APIC
         /* apic read/write intercepts */
-        pv_apic_ops.apic_write = lguest_apic_write;
-        pv_apic_ops.apic_read = lguest_apic_read;
+        apic_ops = &lguest_basic_apic_ops;
 #endif
 
         /* time operations */
diff --git a/arch/x86/mach-default/setup.c b/arch/x86/mach-default/setup.c
index 3f2cf11f201a..37b9ae4d44c5 100644
--- a/arch/x86/mach-default/setup.c
+++ b/arch/x86/mach-default/setup.c
@@ -38,15 +38,6 @@ void __init pre_intr_init_hook(void)
         init_ISA_irqs();
 }
 
-/*
- * IRQ2 is cascade interrupt to second interrupt controller
- */
-static struct irqaction irq2 = {
-        .handler = no_action,
-        .mask = CPU_MASK_NONE,
-        .name = "cascade",
-};
-
 /**
  * intr_init_hook - post gate setup interrupt initialisation
  *
@@ -62,12 +53,6 @@ void __init intr_init_hook(void)
                 if (x86_quirks->arch_intr_init())
                         return;
         }
-#ifdef CONFIG_X86_LOCAL_APIC
-        apic_intr_init();
-#endif
-
-        if (!acpi_ioapic)
-                setup_irq(2, &irq2);
 }
 
 /**
diff --git a/arch/x86/mach-generic/Makefile b/arch/x86/mach-generic/Makefile
index 0dbd7803a1d5..4706de7676b1 100644
--- a/arch/x86/mach-generic/Makefile
+++ b/arch/x86/mach-generic/Makefile
@@ -9,4 +9,4 @@ obj-$(CONFIG_X86_NUMAQ)		+= numaq.o
 obj-$(CONFIG_X86_SUMMIT)        += summit.o
 obj-$(CONFIG_X86_BIGSMP)        += bigsmp.o
 obj-$(CONFIG_X86_ES7000)        += es7000.o
-obj-$(CONFIG_X86_ES7000)        += ../../x86/mach-es7000/
+obj-$(CONFIG_X86_ES7000)        += ../../x86/es7000/
diff --git a/arch/x86/mach-generic/bigsmp.c b/arch/x86/mach-generic/bigsmp.c
index 59d771714559..df37fc9d6a26 100644
--- a/arch/x86/mach-generic/bigsmp.c
+++ b/arch/x86/mach-generic/bigsmp.c
@@ -5,18 +5,17 @@
 #define APIC_DEFINITION 1
 #include <linux/threads.h>
 #include <linux/cpumask.h>
-#include <asm/smp.h>
 #include <asm/mpspec.h>
 #include <asm/genapic.h>
 #include <asm/fixmap.h>
 #include <asm/apicdef.h>
 #include <linux/kernel.h>
-#include <linux/smp.h>
 #include <linux/init.h>
 #include <linux/dmi.h>
-#include <asm/mach-bigsmp/mach_apic.h>
-#include <asm/mach-bigsmp/mach_apicdef.h>
-#include <asm/mach-bigsmp/mach_ipi.h>
+#include <asm/bigsmp/apicdef.h>
+#include <linux/smp.h>
+#include <asm/bigsmp/apic.h>
+#include <asm/bigsmp/ipi.h>
 #include <asm/mach-default/mach_mpparse.h>
 
 static int dmi_bigsmp; /* can be set by dmi scanners */
diff --git a/arch/x86/mach-generic/es7000.c b/arch/x86/mach-generic/es7000.c
index 4742626f08c4..520cca0ee04e 100644
--- a/arch/x86/mach-generic/es7000.c
+++ b/arch/x86/mach-generic/es7000.c
@@ -4,20 +4,19 @@
 #define APIC_DEFINITION 1
 #include <linux/threads.h>
 #include <linux/cpumask.h>
-#include <asm/smp.h>
 #include <asm/mpspec.h>
 #include <asm/genapic.h>
 #include <asm/fixmap.h>
 #include <asm/apicdef.h>
 #include <linux/kernel.h>
 #include <linux/string.h>
-#include <linux/smp.h>
 #include <linux/init.h>
-#include <asm/mach-es7000/mach_apicdef.h>
-#include <asm/mach-es7000/mach_apic.h>
-#include <asm/mach-es7000/mach_ipi.h>
-#include <asm/mach-es7000/mach_mpparse.h>
-#include <asm/mach-es7000/mach_wakecpu.h>
+#include <asm/es7000/apicdef.h>
+#include <linux/smp.h>
+#include <asm/es7000/apic.h>
+#include <asm/es7000/ipi.h>
+#include <asm/es7000/mpparse.h>
+#include <asm/es7000/wakecpu.h>
 
 static int probe_es7000(void)
 {
diff --git a/arch/x86/mach-generic/numaq.c b/arch/x86/mach-generic/numaq.c
index 8091e68764c4..8cf58394975e 100644
--- a/arch/x86/mach-generic/numaq.c
+++ b/arch/x86/mach-generic/numaq.c
@@ -4,7 +4,6 @@
 #define APIC_DEFINITION 1
 #include <linux/threads.h>
 #include <linux/cpumask.h>
-#include <linux/smp.h>
 #include <asm/mpspec.h>
 #include <asm/genapic.h>
 #include <asm/fixmap.h>
@@ -12,11 +11,12 @@
 #include <linux/kernel.h>
 #include <linux/string.h>
 #include <linux/init.h>
-#include <asm/mach-numaq/mach_apic.h>
-#include <asm/mach-numaq/mach_apicdef.h>
-#include <asm/mach-numaq/mach_ipi.h>
-#include <asm/mach-numaq/mach_mpparse.h>
-#include <asm/mach-numaq/mach_wakecpu.h>
+#include <asm/numaq/apicdef.h>
+#include <linux/smp.h>
+#include <asm/numaq/apic.h>
+#include <asm/numaq/ipi.h>
+#include <asm/numaq/mpparse.h>
+#include <asm/numaq/wakecpu.h>
 #include <asm/numaq.h>
 
 static int mps_oem_check(struct mp_config_table *mpc, char *oem,
diff --git a/arch/x86/mach-generic/summit.c b/arch/x86/mach-generic/summit.c
index a97ea0f35b1e..6ad6b67a723d 100644
--- a/arch/x86/mach-generic/summit.c
+++ b/arch/x86/mach-generic/summit.c
@@ -4,19 +4,18 @@
 #define APIC_DEFINITION 1
 #include <linux/threads.h>
 #include <linux/cpumask.h>
-#include <asm/smp.h>
 #include <asm/mpspec.h>
 #include <asm/genapic.h>
 #include <asm/fixmap.h>
 #include <asm/apicdef.h>
 #include <linux/kernel.h>
 #include <linux/string.h>
-#include <linux/smp.h>
 #include <linux/init.h>
-#include <asm/mach-summit/mach_apic.h>
-#include <asm/mach-summit/mach_apicdef.h>
-#include <asm/mach-summit/mach_ipi.h>
-#include <asm/mach-summit/mach_mpparse.h>
+#include <asm/summit/apicdef.h>
+#include <linux/smp.h>
+#include <asm/summit/apic.h>
+#include <asm/summit/ipi.h>
+#include <asm/summit/mpparse.h>
 
 static int probe_summit(void)
 {
diff --git a/arch/x86/pci/acpi.c b/arch/x86/pci/acpi.c
index 19af06927fbc..1d88d2b39771 100644
--- a/arch/x86/pci/acpi.c
+++ b/arch/x86/pci/acpi.c
@@ -250,10 +250,5 @@ int __init pci_acpi_init(void)
                         acpi_pci_irq_enable(dev);
         }
 
-#ifdef CONFIG_X86_IO_APIC
-        if (acpi_ioapic)
-                print_IO_APIC();
-#endif
-
         return 0;
 }
diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index 7dcd321a0508..a27d562a9744 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -36,6 +36,7 @@
 #include <xen/hvc-console.h>
 
 #include <asm/paravirt.h>
+#include <asm/apic.h>
 #include <asm/page.h>
 #include <asm/xen/hypercall.h>
 #include <asm/xen/hypervisor.h>
@@ -580,16 +581,47 @@ static void xen_io_delay(void)
 }
 
 #ifdef CONFIG_X86_LOCAL_APIC
-static u32 xen_apic_read(unsigned long reg)
+static u32 xen_apic_read(u32 reg)
 {
         return 0;
 }
 
-static void xen_apic_write(unsigned long reg, u32 val)
+static void xen_apic_write(u32 reg, u32 val)
 {
         /* Warn to see if there's any stray references */
         WARN_ON(1);
 }
+
+static u64 xen_apic_icr_read(void)
+{
+        return 0;
+}
+
+static void xen_apic_icr_write(u32 low, u32 id)
+{
+        /* Warn to see if there's any stray references */
+        WARN_ON(1);
+}
+
+static void xen_apic_wait_icr_idle(void)
+{
+        return;
+}
+
+static u32 xen_safe_apic_wait_icr_idle(void)
+{
+        return 0;
+}
+
+static struct apic_ops xen_basic_apic_ops = {
+        .read = xen_apic_read,
+        .write = xen_apic_write,
+        .icr_read = xen_apic_icr_read,
+        .icr_write = xen_apic_icr_write,
+        .wait_icr_idle = xen_apic_wait_icr_idle,
+        .safe_wait_icr_idle = xen_safe_apic_wait_icr_idle,
+};
+
 #endif
 
 static void xen_flush_tlb(void)
@@ -1273,8 +1305,6 @@ static const struct pv_irq_ops xen_irq_ops __initdata = {
 
 static const struct pv_apic_ops xen_apic_ops __initdata = {
 #ifdef CONFIG_X86_LOCAL_APIC
-        .apic_write = xen_apic_write,
-        .apic_read = xen_apic_read,
         .setup_boot_clock = paravirt_nop,
         .setup_secondary_clock = paravirt_nop,
         .startup_ipi_hook = paravirt_nop,
@@ -1677,6 +1707,13 @@ asmlinkage void __init xen_start_kernel(void)
         pv_apic_ops = xen_apic_ops;
         pv_mmu_ops = xen_mmu_ops;
 
+#ifdef CONFIG_X86_LOCAL_APIC
+        /*
+         * set up the basic apic ops.
+         */
+        apic_ops = &xen_basic_apic_ops;
+#endif
+
         if (xen_feature(XENFEAT_mmu_pt_update_preserve_ad)) {
                 pv_mmu_ops.ptep_modify_prot_start = xen_ptep_modify_prot_start;
                 pv_mmu_ops.ptep_modify_prot_commit = xen_ptep_modify_prot_commit;
diff --git a/drivers/pci/Makefile b/drivers/pci/Makefile
index 7d63f8ced24b..4b47f4ece5b7 100644
--- a/drivers/pci/Makefile
+++ b/drivers/pci/Makefile
@@ -26,6 +26,8 @@ obj-$(CONFIG_HT_IRQ) += htirq.o
 # Build Intel IOMMU support
 obj-$(CONFIG_DMAR) += dmar.o iova.o intel-iommu.o
 
+obj-$(CONFIG_INTR_REMAP) += dmar.o intr_remapping.o
+
 #
 # Some architectures use the generic PCI setup functions
 #
diff --git a/drivers/pci/dma_remapping.h b/drivers/pci/dma_remapping.h
new file mode 100644
index 000000000000..bff5c65f81dc
--- /dev/null
+++ b/drivers/pci/dma_remapping.h
@@ -0,0 +1,157 @@
+#ifndef _DMA_REMAPPING_H
+#define _DMA_REMAPPING_H
+
+/*
+ * We need a fixed PAGE_SIZE of 4K irrespective of
+ * arch PAGE_SIZE for IOMMU page tables.
+ */
+#define PAGE_SHIFT_4K           (12)
+#define PAGE_SIZE_4K            (1UL << PAGE_SHIFT_4K)
+#define PAGE_MASK_4K            (((u64)-1) << PAGE_SHIFT_4K)
+#define PAGE_ALIGN_4K(addr)     (((addr) + PAGE_SIZE_4K - 1) & PAGE_MASK_4K)
+
+#define IOVA_PFN(addr)          ((addr) >> PAGE_SHIFT_4K)
+#define DMA_32BIT_PFN           IOVA_PFN(DMA_32BIT_MASK)
+#define DMA_64BIT_PFN           IOVA_PFN(DMA_64BIT_MASK)
+
+
+/*
+ * 0: Present
+ * 1-11: Reserved
+ * 12-63: Context Ptr (12 - (haw-1))
+ * 64-127: Reserved
+ */
+struct root_entry {
+        u64     val;
+        u64     rsvd1;
+};
+#define ROOT_ENTRY_NR (PAGE_SIZE_4K/sizeof(struct root_entry))
+static inline bool root_present(struct root_entry *root)
+{
+        return (root->val & 1);
+}
+static inline void set_root_present(struct root_entry *root)
+{
+        root->val |= 1;
+}
+static inline void set_root_value(struct root_entry *root, unsigned long value)
+{
+        root->val |= value & PAGE_MASK_4K;
+}
+
+struct context_entry;
+static inline struct context_entry *
+get_context_addr_from_root(struct root_entry *root)
+{
+        return (struct context_entry *)
+                (root_present(root)?phys_to_virt(
+                root->val & PAGE_MASK_4K):
+                NULL);
+}
+
+/*
+ * low 64 bits:
+ * 0: present
+ * 1: fault processing disable
+ * 2-3: translation type
+ * 12-63: address space root
+ * high 64 bits:
+ * 0-2: address width
+ * 3-6: aval
+ * 8-23: domain id
+ */
+struct context_entry {
+        u64 lo;
+        u64 hi;
+};
+#define context_present(c) ((c).lo & 1)
+#define context_fault_disable(c) (((c).lo >> 1) & 1)
+#define context_translation_type(c) (((c).lo >> 2) & 3)
+#define context_address_root(c) ((c).lo & PAGE_MASK_4K)
+#define context_address_width(c) ((c).hi &  7)
+#define context_domain_id(c) (((c).hi >> 8) & ((1 << 16) - 1))
+
+#define context_set_present(c) do {(c).lo |= 1;} while (0)
+#define context_set_fault_enable(c) \
+        do {(c).lo &= (((u64)-1) << 2) | 1;} while (0)
+#define context_set_translation_type(c, val) \
+        do { \
+                (c).lo &= (((u64)-1) << 4) | 3; \
+                (c).lo |= ((val) & 3) << 2; \
+        } while (0)
+#define CONTEXT_TT_MULTI_LEVEL 0
+#define context_set_address_root(c, val) \
+        do {(c).lo |= (val) & PAGE_MASK_4K;} while (0)
+#define context_set_address_width(c, val) do {(c).hi |= (val) & 7;} while (0)
+#define context_set_domain_id(c, val) \
+        do {(c).hi |= ((val) & ((1 << 16) - 1)) << 8;} while (0)
+#define context_clear_entry(c) do {(c).lo = 0; (c).hi = 0;} while (0)
+
+/*
+ * 0: readable
+ * 1: writable
+ * 2-6: reserved
+ * 7: super page
+ * 8-11: available
+ * 12-63: Host physcial address
+ */
+struct dma_pte {
+        u64 val;
+};
+#define dma_clear_pte(p)        do {(p).val = 0;} while (0)
+
+#define DMA_PTE_READ (1)
+#define DMA_PTE_WRITE (2)
+
+#define dma_set_pte_readable(p) do {(p).val |= DMA_PTE_READ;} while (0)
+#define dma_set_pte_writable(p) do {(p).val |= DMA_PTE_WRITE;} while (0)
+#define dma_set_pte_prot(p, prot) \
+                do {(p).val = ((p).val & ~3) | ((prot) & 3); } while (0)
+#define dma_pte_addr(p) ((p).val & PAGE_MASK_4K)
+#define dma_set_pte_addr(p, addr) do {\
+                (p).val |= ((addr) & PAGE_MASK_4K); } while (0)
+#define dma_pte_present(p) (((p).val & 3) != 0)
+
+struct intel_iommu;
+
+struct dmar_domain {
+        int     id;                     /* domain id */
+        struct intel_iommu *iommu;      /* back pointer to owning iommu */
+
+        struct list_head devices;       /* all devices' list */
+        struct iova_domain iovad;       /* iova's that belong to this domain */
+
+        struct dma_pte  *pgd;           /* virtual address */
+        spinlock_t      mapping_lock;   /* page table lock */
+        int             gaw;            /* max guest address width */
+
+        /* adjusted guest address width, 0 is level 2 30-bit */
+        int             agaw;
+
+#define DOMAIN_FLAG_MULTIPLE_DEVICES 1
+        int             flags;
+};
+
+/* PCI domain-device relationship */
+struct device_domain_info {
+        struct list_head link;  /* link to domain siblings */
+        struct list_head global; /* link to global list */
+        u8 bus;                 /* PCI bus numer */
+        u8 devfn;               /* PCI devfn number */
+        struct pci_dev *dev; /* it's NULL for PCIE-to-PCI bridge */
+        struct dmar_domain *domain; /* pointer to domain */
+};
+
+extern int init_dmars(void);
+extern void free_dmar_iommu(struct intel_iommu *iommu);
+
+extern int dmar_disabled;
+
+#ifndef CONFIG_DMAR_GFX_WA
+static inline void iommu_prepare_gfx_mapping(void)
+{
+        return;
+}
+#endif /* !CONFIG_DMAR_GFX_WA */
+
+#endif
diff --git a/drivers/pci/dmar.c b/drivers/pci/dmar.c
index 8bf86ae2333f..bd2c01674f5e 100644
--- a/drivers/pci/dmar.c
+++ b/drivers/pci/dmar.c
@@ -19,13 +19,16 @@
  * Author: Shaohua Li <shaohua.li@intel.com>
  * Author: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
  *
- * This file implements early detection/parsing of DMA Remapping Devices
+ * This file implements early detection/parsing of Remapping Devices
  * reported to OS through BIOS via DMA remapping reporting (DMAR) ACPI
  * tables.
+ *
+ * These routines are used by both DMA-remapping and Interrupt-remapping
  */
 
 #include <linux/pci.h>
 #include <linux/dmar.h>
+#include <linux/timer.h>
 #include "iova.h"
 #include "intel-iommu.h"
 
@@ -37,7 +40,6 @@
  * these units are not supported by the architecture.
  */
 LIST_HEAD(dmar_drhd_units);
-LIST_HEAD(dmar_rmrr_units);
 
 static struct acpi_table_header * __initdata dmar_tbl;
 
@@ -53,11 +55,6 @@ static void __init dmar_register_drhd_unit(struct dmar_drhd_unit *drhd)
                 list_add(&drhd->list, &dmar_drhd_units);
 }
 
-static void __init dmar_register_rmrr_unit(struct dmar_rmrr_unit *rmrr)
-{
-        list_add(&rmrr->list, &dmar_rmrr_units);
-}
-
 static int __init dmar_parse_one_dev_scope(struct acpi_dmar_device_scope *scope,
                                            struct pci_dev **dev, u16 segment)
 {
@@ -172,19 +169,37 @@ dmar_parse_one_drhd(struct acpi_dmar_header *header)
         struct acpi_dmar_hardware_unit *drhd;
         struct dmar_drhd_unit *dmaru;
         int ret = 0;
-        static int include_all;
 
         dmaru = kzalloc(sizeof(*dmaru), GFP_KERNEL);
         if (!dmaru)
                 return -ENOMEM;
 
+        dmaru->hdr = header;
         drhd = (struct acpi_dmar_hardware_unit *)header;
         dmaru->reg_base_addr = drhd->address;
         dmaru->include_all = drhd->flags & 0x1; /* BIT0: INCLUDE_ALL */
 
+        ret = alloc_iommu(dmaru);
+        if (ret) {
+                kfree(dmaru);
+                return ret;
+        }
+        dmar_register_drhd_unit(dmaru);
+        return 0;
+}
+
+static int __init
+dmar_parse_dev(struct dmar_drhd_unit *dmaru)
+{
+        struct acpi_dmar_hardware_unit *drhd;
+        static int include_all;
+        int ret;
+
+        drhd = (struct acpi_dmar_hardware_unit *) dmaru->hdr;
+
         if (!dmaru->include_all)
                 ret = dmar_parse_dev_scope((void *)(drhd + 1),
-                                ((void *)drhd) + header->length,
+                                ((void *)drhd) + drhd->header.length,
                                 &dmaru->devices_cnt, &dmaru->devices,
                                 drhd->segment);
         else {
@@ -197,37 +212,59 @@ dmar_parse_one_drhd(struct acpi_dmar_header *header)
                 include_all = 1;
         }
 
-        if (ret || (dmaru->devices_cnt == 0 && !dmaru->include_all))
+        if (ret || (dmaru->devices_cnt == 0 && !dmaru->include_all)) {
+                list_del(&dmaru->list);
                 kfree(dmaru);
-        else
-                dmar_register_drhd_unit(dmaru);
+        }
         return ret;
 }
 
+#ifdef CONFIG_DMAR
+LIST_HEAD(dmar_rmrr_units);
+
+static void __init dmar_register_rmrr_unit(struct dmar_rmrr_unit *rmrr)
+{
+        list_add(&rmrr->list, &dmar_rmrr_units);
+}
+
+
 static int __init
 dmar_parse_one_rmrr(struct acpi_dmar_header *header)
 {
         struct acpi_dmar_reserved_memory *rmrr;
         struct dmar_rmrr_unit *rmrru;
-        int ret = 0;
 
         rmrru = kzalloc(sizeof(*rmrru), GFP_KERNEL);
         if (!rmrru)
                 return -ENOMEM;
 
+        rmrru->hdr = header;
         rmrr = (struct acpi_dmar_reserved_memory *)header;
         rmrru->base_address = rmrr->base_address;
         rmrru->end_address = rmrr->end_address;
+
+        dmar_register_rmrr_unit(rmrru);
+        return 0;
+}
+
+static int __init
+rmrr_parse_dev(struct dmar_rmrr_unit *rmrru)
+{
+        struct acpi_dmar_reserved_memory *rmrr;
+        int ret;
+
+        rmrr = (struct acpi_dmar_reserved_memory *) rmrru->hdr;
         ret = dmar_parse_dev_scope((void *)(rmrr + 1),
-                ((void *)rmrr) + header->length,
+                ((void *)rmrr) + rmrr->header.length,
                 &rmrru->devices_cnt, &rmrru->devices, rmrr->segment);
 
-        if (ret || (rmrru->devices_cnt == 0))
+        if (ret || (rmrru->devices_cnt == 0)) {
+                list_del(&rmrru->list);
                 kfree(rmrru);
-        else
-                dmar_register_rmrr_unit(rmrru);
+        }
         return ret;
 }
+#endif
 
 static void __init
 dmar_table_print_dmar_entry(struct acpi_dmar_header *header)
@@ -252,6 +289,7 @@ dmar_table_print_dmar_entry(struct acpi_dmar_header *header)
         }
 }
 
+
 /**
  * parse_dmar_table - parses the DMA reporting table
  */
@@ -284,7 +322,9 @@ parse_dmar_table(void)
                         ret = dmar_parse_one_drhd(entry_header);
                         break;
                 case ACPI_DMAR_TYPE_RESERVED_MEMORY:
+#ifdef CONFIG_DMAR
                         ret = dmar_parse_one_rmrr(entry_header);
+#endif
                         break;
                 default:
                         printk(KERN_WARNING PREFIX
@@ -300,15 +340,77 @@ parse_dmar_table(void)
         return ret;
 }
 
+int dmar_pci_device_match(struct pci_dev *devices[], int cnt,
+                          struct pci_dev *dev)
+{
+        int index;
+
+        while (dev) {
+                for (index = 0; index < cnt; index++)
+                        if (dev == devices[index])
+                                return 1;
 
-int __init dmar_table_init(void)
+                /* Check our parent */
+                dev = dev->bus->self;
+        }
+
+        return 0;
+}
+
+struct dmar_drhd_unit *
+dmar_find_matched_drhd_unit(struct pci_dev *dev)
 {
+        struct dmar_drhd_unit *drhd = NULL;
+
+        list_for_each_entry(drhd, &dmar_drhd_units, list) {
+                if (drhd->include_all || dmar_pci_device_match(drhd->devices,
+                                                drhd->devices_cnt, dev))
+                        return drhd;
+        }
+
+        return NULL;
+}
+
+int __init dmar_dev_scope_init(void)
+{
+        struct dmar_drhd_unit *drhd;
+        int ret = -ENODEV;
+
+        for_each_drhd_unit(drhd) {
+                ret = dmar_parse_dev(drhd);
+                if (ret)
+                        return ret;
+        }
+
+#ifdef CONFIG_DMAR
+        {
+                struct dmar_rmrr_unit *rmrr;
+                for_each_rmrr_units(rmrr) {
+                        ret = rmrr_parse_dev(rmrr);
+                        if (ret)
+                                return ret;
+                }
+        }
+#endif
+
+        return ret;
+}
 
+
+int __init dmar_table_init(void)
+{
+        static int dmar_table_initialized;
         int ret;
 
+        if (dmar_table_initialized)
+                return 0;
+
+        dmar_table_initialized = 1;
+
         ret = parse_dmar_table();
         if (ret) {
-                printk(KERN_INFO PREFIX "parse DMAR table failure.\n");
+                if (ret != -ENODEV)
+                        printk(KERN_INFO PREFIX "parse DMAR table failure.\n");
                 return ret;
         }
 
@@ -317,9 +419,14 @@ int __init dmar_table_init(void)
                 return -ENODEV;
         }
 
+#ifdef CONFIG_DMAR
         if (list_empty(&dmar_rmrr_units))
                 printk(KERN_INFO PREFIX "No RMRR found\n");
+#endif
 
+#ifdef CONFIG_INTR_REMAP
+        parse_ioapics_under_ir();
+#endif
         return 0;
 }
 
@@ -341,3 +448,255 @@ int __init early_dmar_detect(void)
 
         return (ACPI_SUCCESS(status) ? 1 : 0);
 }
+
+void __init detect_intel_iommu(void)
+{
+        int ret;
+
+        ret = early_dmar_detect();
+
+#ifdef CONFIG_DMAR
+        {
+                struct acpi_table_dmar *dmar;
+                /*
+                 * for now we will disable dma-remapping when interrupt
+                 * remapping is enabled.
+                 * When support for queued invalidation for IOTLB invalidation
+                 * is added, we will not need this any more.
+                 */
+                dmar = (struct acpi_table_dmar *) dmar_tbl;
+                if (ret && cpu_has_x2apic && dmar->flags & 0x1) {
+                        printk(KERN_INFO
+                               "Queued invalidation will be enabled to support "
+                               "x2apic and Intr-remapping.\n");
+                        printk(KERN_INFO
+                               "Disabling IOMMU detection, because of missing "
+                               "queued invalidation support for IOTLB "
+                               "invalidation\n");
+                        printk(KERN_INFO
+                               "Use \"nox2apic\", if you want to use Intel "
+                               " IOMMU for DMA-remapping and don't care about "
+                               " x2apic support\n");
+
+                        dmar_disabled = 1;
+                        return;
+                }
+
+                if (ret && !no_iommu && !iommu_detected && !swiotlb &&
+                    !dmar_disabled)
+                        iommu_detected = 1;
+        }
+#endif
+}
+
+
+int alloc_iommu(struct dmar_drhd_unit *drhd)
+{
+        struct intel_iommu *iommu;
+        int map_size;
+        u32 ver;
+        static int iommu_allocated = 0;
+
+        iommu = kzalloc(sizeof(*iommu), GFP_KERNEL);
+        if (!iommu)
+                return -ENOMEM;
+
+        iommu->seq_id = iommu_allocated++;
+
+        iommu->reg = ioremap(drhd->reg_base_addr, PAGE_SIZE_4K);
+        if (!iommu->reg) {
+                printk(KERN_ERR "IOMMU: can't map the region\n");
+                goto error;
+        }
+        iommu->cap = dmar_readq(iommu->reg + DMAR_CAP_REG);
+        iommu->ecap = dmar_readq(iommu->reg + DMAR_ECAP_REG);
+
+        /* the registers might be more than one page */
+        map_size = max_t(int, ecap_max_iotlb_offset(iommu->ecap),
+                cap_max_fault_reg_offset(iommu->cap));
+        map_size = PAGE_ALIGN_4K(map_size);
+        if (map_size > PAGE_SIZE_4K) {
+                iounmap(iommu->reg);
+                iommu->reg = ioremap(drhd->reg_base_addr, map_size);
+                if (!iommu->reg) {
+                        printk(KERN_ERR "IOMMU: can't map the region\n");
+                        goto error;
+                }
+        }
+
+        ver = readl(iommu->reg + DMAR_VER_REG);
+        pr_debug("IOMMU %llx: ver %d:%d cap %llx ecap %llx\n",
+                drhd->reg_base_addr, DMAR_VER_MAJOR(ver), DMAR_VER_MINOR(ver),
+                iommu->cap, iommu->ecap);
+
+        spin_lock_init(&iommu->register_lock);
+
+        drhd->iommu = iommu;
+        return 0;
+error:
+        kfree(iommu);
+        return -1;
+}
+
+void free_iommu(struct intel_iommu *iommu)
+{
+        if (!iommu)
+                return;
+
+#ifdef CONFIG_DMAR
+        free_dmar_iommu(iommu);
+#endif
+
+        if (iommu->reg)
+                iounmap(iommu->reg);
+        kfree(iommu);
+}
+
+/*
+ * Reclaim all the submitted descriptors which have completed its work.
+ */
+static inline void reclaim_free_desc(struct q_inval *qi)
+{
+        while (qi->desc_status[qi->free_tail] == QI_DONE) {
+                qi->desc_status[qi->free_tail] = QI_FREE;
+                qi->free_tail = (qi->free_tail + 1) % QI_LENGTH;
+                qi->free_cnt++;
+        }
+}
+
+/*
+ * Submit the queued invalidation descriptor to the remapping
+ * hardware unit and wait for its completion.
+ */
+void qi_submit_sync(struct qi_desc *desc, struct intel_iommu *iommu)
+{
+        struct q_inval *qi = iommu->qi;
+        struct qi_desc *hw, wait_desc;
+        int wait_index, index;
+        unsigned long flags;
+
+        if (!qi)
+                return;
+
+        hw = qi->desc;
+
+        spin_lock(&qi->q_lock);
+        while (qi->free_cnt < 3) {
+                spin_unlock(&qi->q_lock);
+                cpu_relax();
+                spin_lock(&qi->q_lock);
+        }
+
+        index = qi->free_head;
+        wait_index = (index + 1) % QI_LENGTH;
+
+        qi->desc_status[index] = qi->desc_status[wait_index] = QI_IN_USE;
+
+        hw[index] = *desc;
+
+        wait_desc.low = QI_IWD_STATUS_DATA(2) | QI_IWD_STATUS_WRITE | QI_IWD_TYPE;
+        wait_desc.high = virt_to_phys(&qi->desc_status[wait_index]);
+
+        hw[wait_index] = wait_desc;
+
+        __iommu_flush_cache(iommu, &hw[index], sizeof(struct qi_desc));
+        __iommu_flush_cache(iommu, &hw[wait_index], sizeof(struct qi_desc));
+
+        qi->free_head = (qi->free_head + 2) % QI_LENGTH;
+        qi->free_cnt -= 2;
+
+        spin_lock_irqsave(&iommu->register_lock, flags);
+        /*
+         * update the HW tail register indicating the presence of
+         * new descriptors.
+         */
+        writel(qi->free_head << 4, iommu->reg + DMAR_IQT_REG);
+        spin_unlock_irqrestore(&iommu->register_lock, flags);
+
+        while (qi->desc_status[wait_index] != QI_DONE) {
+                spin_unlock(&qi->q_lock);
+                cpu_relax();
+                spin_lock(&qi->q_lock);
+        }
+
+        qi->desc_status[index] = QI_DONE;
+
+        reclaim_free_desc(qi);
+        spin_unlock(&qi->q_lock);
+}
+
+/*
+ * Flush the global interrupt entry cache.
+ */
+void qi_global_iec(struct intel_iommu *iommu)
+{
+        struct qi_desc desc;
+
+        desc.low = QI_IEC_TYPE;
+        desc.high = 0;
+
+        qi_submit_sync(&desc, iommu);
+}
+
+/*
+ * Enable Queued Invalidation interface. This is a must to support
+ * interrupt-remapping. Also used by DMA-remapping, which replaces
+ * register based IOTLB invalidation.
+ */
+int dmar_enable_qi(struct intel_iommu *iommu)
+{
+        u32 cmd, sts;
+        unsigned long flags;
+        struct q_inval *qi;
+
+        if (!ecap_qis(iommu->ecap))
+                return -ENOENT;
+
+        /*
+         * queued invalidation is already setup and enabled.
+         */
+        if (iommu->qi)
+                return 0;
+
+        iommu->qi = kmalloc(sizeof(*qi), GFP_KERNEL);
+        if (!iommu->qi)
+                return -ENOMEM;
+
+        qi = iommu->qi;
+
+        qi->desc = (void *)(get_zeroed_page(GFP_KERNEL));
+        if (!qi->desc) {
+                kfree(qi);
+                iommu->qi = 0;
+                return -ENOMEM;
+        }
+
+        qi->desc_status = kmalloc(QI_LENGTH * sizeof(int), GFP_KERNEL);
+        if (!qi->desc_status) {
+                free_page((unsigned long) qi->desc);
+                kfree(qi);
+                iommu->qi = 0;
+                return -ENOMEM;
+        }
+
+        qi->free_head = qi->free_tail = 0;
+        qi->free_cnt = QI_LENGTH;
+
+        spin_lock_init(&qi->q_lock);
+
+        spin_lock_irqsave(&iommu->register_lock, flags);
+        /* write zero to the tail reg */
+        writel(0, iommu->reg + DMAR_IQT_REG);
+
+        dmar_writeq(iommu->reg + DMAR_IQA_REG, virt_to_phys(qi->desc));
+
+        cmd = iommu->gcmd | DMA_GCMD_QIE;
+        iommu->gcmd |= DMA_GCMD_QIE;
+        writel(cmd, iommu->reg + DMAR_GCMD_REG);
+
+        /* Make sure hardware complete it */
+        IOMMU_WAIT_OP(iommu, DMAR_GSTS_REG, readl, (sts & DMA_GSTS_QIES), sts);
+        spin_unlock_irqrestore(&iommu->register_lock, flags);
+
+        return 0;
+}
diff --git a/drivers/pci/intel-iommu.c b/drivers/pci/intel-iommu.c
index 6c4c1c3c50ee..389fdd6f4a9f 100644
--- a/drivers/pci/intel-iommu.c
+++ b/drivers/pci/intel-iommu.c
@@ -49,8 +49,6 @@
 
 #define DEFAULT_DOMAIN_ADDRESS_WIDTH 48
 
-#define DMAR_OPERATION_TIMEOUT ((cycles_t) tsc_khz*10*1000) /* 10sec */
-
 #define DOMAIN_MAX_ADDR(gaw) ((((u64)1) << gaw) - 1)
 
 
@@ -58,8 +56,6 @@ static void flush_unmaps_timeout(unsigned long data);
 
 DEFINE_TIMER(unmap_timer,  flush_unmaps_timeout, 0, 0);
 
-static struct intel_iommu *g_iommus;
-
 #define HIGH_WATER_MARK 250
 struct deferred_flush_tables {
         int next;
@@ -185,13 +181,6 @@ void free_iova_mem(struct iova *iova)
         kmem_cache_free(iommu_iova_cache, iova);
 }
 
-static inline void __iommu_flush_cache(
-        struct intel_iommu *iommu, void *addr, int size)
-{
-        if (!ecap_coherent(iommu->ecap))
-                clflush_cache_range(addr, size);
-}
-
 /* Gets context entry for a given bus and devfn */
 static struct context_entry * device_to_context_entry(struct intel_iommu *iommu,
                 u8 bus, u8 devfn)
@@ -488,19 +477,6 @@ static int iommu_alloc_root_entry(struct intel_iommu *iommu)
         return 0;
 }
 
-#define IOMMU_WAIT_OP(iommu, offset, op, cond, sts) \
-{\
-        cycles_t start_time = get_cycles();\
-        while (1) {\
-                sts = op (iommu->reg + offset);\
-                if (cond)\
-                        break;\
-                if (DMAR_OPERATION_TIMEOUT < (get_cycles() - start_time))\
-                        panic("DMAR hardware is malfunctioning\n");\
-                cpu_relax();\
-        }\
-}
-
 static void iommu_set_root_entry(struct intel_iommu *iommu)
 {
         void *addr;
@@ -990,6 +966,8 @@ static int iommu_init_domains(struct intel_iommu *iommu)
                 return -ENOMEM;
         }
 
+        spin_lock_init(&iommu->lock);
+
         /*
          * if Caching mode is set, then invalid translations are tagged
          * with domainid 0. Hence we need to pre-allocate it.
@@ -998,62 +976,15 @@ static int iommu_init_domains(struct intel_iommu *iommu)
                 set_bit(0, iommu->domain_ids);
         return 0;
 }
-static struct intel_iommu *alloc_iommu(struct intel_iommu *iommu,
-                                        struct dmar_drhd_unit *drhd)
-{
-        int ret;
-        int map_size;
-        u32 ver;
-
-        iommu->reg = ioremap(drhd->reg_base_addr, PAGE_SIZE_4K);
-        if (!iommu->reg) {
-                printk(KERN_ERR "IOMMU: can't map the region\n");
-                goto error;
-        }
-        iommu->cap = dmar_readq(iommu->reg + DMAR_CAP_REG);
-        iommu->ecap = dmar_readq(iommu->reg + DMAR_ECAP_REG);
-
-        /* the registers might be more than one page */
-        map_size = max_t(int, ecap_max_iotlb_offset(iommu->ecap),
-                cap_max_fault_reg_offset(iommu->cap));
-        map_size = PAGE_ALIGN_4K(map_size);
-        if (map_size > PAGE_SIZE_4K) {
-                iounmap(iommu->reg);
-                iommu->reg = ioremap(drhd->reg_base_addr, map_size);
-                if (!iommu->reg) {
-                        printk(KERN_ERR "IOMMU: can't map the region\n");
-                        goto error;
-                }
-        }
-
-        ver = readl(iommu->reg + DMAR_VER_REG);
-        pr_debug("IOMMU %llx: ver %d:%d cap %llx ecap %llx\n",
-                drhd->reg_base_addr, DMAR_VER_MAJOR(ver), DMAR_VER_MINOR(ver),
-                iommu->cap, iommu->ecap);
-        ret = iommu_init_domains(iommu);
-        if (ret)
-                goto error_unmap;
-        spin_lock_init(&iommu->lock);
-        spin_lock_init(&iommu->register_lock);
 
-        drhd->iommu = iommu;
-        return iommu;
-error_unmap:
-        iounmap(iommu->reg);
-error:
-        kfree(iommu);
-        return NULL;
-}
 
 static void domain_exit(struct dmar_domain *domain);
-static void free_iommu(struct intel_iommu *iommu)
+
+void free_dmar_iommu(struct intel_iommu *iommu)
 {
         struct dmar_domain *domain;
         int i;
 
-        if (!iommu)
-                return;
-
         i = find_first_bit(iommu->domain_ids, cap_ndoms(iommu->cap));
         for (; i < cap_ndoms(iommu->cap); ) {
                 domain = iommu->domains[i];
@@ -1078,10 +1009,6 @@ static void free_iommu(struct intel_iommu *iommu)
 
         /* free context mapping */
         free_context_table(iommu);
-
-        if (iommu->reg)
-                iounmap(iommu->reg);
-        kfree(iommu);
 }
 
 static struct dmar_domain * iommu_alloc_domain(struct intel_iommu *iommu)
@@ -1426,37 +1353,6 @@ find_domain(struct pci_dev *pdev)
         return NULL;
 }
 
-static int dmar_pci_device_match(struct pci_dev *devices[], int cnt,
-     struct pci_dev *dev)
-{
-        int index;
-
-        while (dev) {
-                for (index = 0; index < cnt; index++)
-                        if (dev == devices[index])
-                                return 1;
-
-                /* Check our parent */
-                dev = dev->bus->self;
-        }
-
-        return 0;
-}
-
-static struct dmar_drhd_unit *
-dmar_find_matched_drhd_unit(struct pci_dev *dev)
-{
-        struct dmar_drhd_unit *drhd = NULL;
-
-        list_for_each_entry(drhd, &dmar_drhd_units, list) {
-                if (drhd->include_all || dmar_pci_device_match(drhd->devices,
-                                                drhd->devices_cnt, dev))
-                        return drhd;
-        }
-
-        return NULL;
-}
-
 /* domain is initialized */
 static struct dmar_domain *get_domain_for_dev(struct pci_dev *pdev, int gaw)
 {
@@ -1729,8 +1625,6 @@ int __init init_dmars(void)
          * endfor
          */
         for_each_drhd_unit(drhd) {
-                if (drhd->ignored)
-                        continue;
                 g_num_of_iommus++;
                 /*
                  * lock not needed as this is only incremented in the single
@@ -1739,12 +1633,6 @@ int __init init_dmars(void)
                  */
         }
 
-        g_iommus = kzalloc(g_num_of_iommus * sizeof(*iommu), GFP_KERNEL);
-        if (!g_iommus) {
-                ret = -ENOMEM;
-                goto error;
-        }
-
         deferred_flush = kzalloc(g_num_of_iommus *
                 sizeof(struct deferred_flush_tables), GFP_KERNEL);
         if (!deferred_flush) {
@@ -1752,16 +1640,15 @@ int __init init_dmars(void)
                 goto error;
         }
 
-        i = 0;
         for_each_drhd_unit(drhd) {
                 if (drhd->ignored)
                         continue;
-                iommu = alloc_iommu(&g_iommus[i], drhd);
-                i++;
-                if (!iommu) {
-                        ret = -ENOMEM;
+
+                iommu = drhd->iommu;
+
+                ret = iommu_init_domains(iommu);
+                if (ret)
                         goto error;
-                }
 
                 /*
                  * TBD:
@@ -1845,7 +1732,6 @@ error:
                 iommu = drhd->iommu;
                 free_iommu(iommu);
         }
-        kfree(g_iommus);
         return ret;
 }
 
@@ -2002,7 +1888,10 @@ static void flush_unmaps(void)
         /* just flush them all */
         for (i = 0; i < g_num_of_iommus; i++) {
                 if (deferred_flush[i].next) {
-                        iommu_flush_iotlb_global(&g_iommus[i], 0);
+                        struct intel_iommu *iommu =
+                                deferred_flush[i].domain[0]->iommu;
+
+                        iommu_flush_iotlb_global(iommu, 0);
                         for (j = 0; j < deferred_flush[i].next; j++) {
                                 __free_iova(&deferred_flush[i].domain[j]->iovad,
                                                 deferred_flush[i].iova[j]);
@@ -2032,7 +1921,8 @@ static void add_unmap(struct dmar_domain *dom, struct iova *iova)
         if (list_size == HIGH_WATER_MARK)
                 flush_unmaps();
 
-        iommu_id = dom->iommu - g_iommus;
+        iommu_id = dom->iommu->seq_id;
+
         next = deferred_flush[iommu_id].next;
         deferred_flush[iommu_id].domain[next] = dom;
         deferred_flush[iommu_id].iova[next] = iova;
@@ -2348,38 +2238,6 @@ static void __init iommu_exit_mempool(void)
 
 }
 
-static int blacklist_iommu(const struct dmi_system_id *id)
-{
-        printk(KERN_INFO "%s detected; disabling IOMMU\n",
-               id->ident);
-        dmar_disabled = 1;
-        return 0;
-}
-
-static struct dmi_system_id __initdata intel_iommu_dmi_table[] = {
-        {       /* Some DG33BU BIOS revisions advertised non-existent VT-d */
-                .callback = blacklist_iommu,
-                .ident = "Intel DG33BU",
-                {       DMI_MATCH(DMI_BOARD_VENDOR, "Intel Corporation"),
-                        DMI_MATCH(DMI_BOARD_NAME, "DG33BU"),
-                }
-        },
-        { }
-};
-
-
-void __init detect_intel_iommu(void)
-{
-        if (swiotlb || no_iommu || iommu_detected || dmar_disabled)
-                return;
-        if (early_dmar_detect()) {
-                dmi_check_system(intel_iommu_dmi_table);
-                if (dmar_disabled)
-                        return;
-                iommu_detected = 1;
-        }
-}
-
 static void __init init_no_remapping_devices(void)
 {
         struct dmar_drhd_unit *drhd;
@@ -2426,12 +2284,19 @@ int __init intel_iommu_init(void)
 {
         int ret = 0;
 
-        if (no_iommu || swiotlb || dmar_disabled)
-                return -ENODEV;
-
         if (dmar_table_init())
                 return  -ENODEV;
 
+        if (dmar_dev_scope_init())
+                return  -ENODEV;
+
+        /*
+         * Check the need for DMA-remapping initialization now.
+         * Above initialization will also be used by Interrupt-remapping.
+         */
+        if (no_iommu || swiotlb || dmar_disabled)
+                return -ENODEV;
+
         iommu_init_mempool();
         dmar_init_reserved_ranges();
 
diff --git a/drivers/pci/intel-iommu.h b/drivers/pci/intel-iommu.h
index afc0ad96122e..2142c01e0143 100644
--- a/drivers/pci/intel-iommu.h
+++ b/drivers/pci/intel-iommu.h
@@ -27,19 +27,8 @@
 #include <linux/sysdev.h>
 #include "iova.h"
 #include <linux/io.h>
-
-/*
- * We need a fixed PAGE_SIZE of 4K irrespective of
- * arch PAGE_SIZE for IOMMU page tables.
- */
-#define PAGE_SHIFT_4K           (12)
-#define PAGE_SIZE_4K            (1UL << PAGE_SHIFT_4K)
-#define PAGE_MASK_4K            (((u64)-1) << PAGE_SHIFT_4K)
-#define PAGE_ALIGN_4K(addr)     (((addr) + PAGE_SIZE_4K - 1) & PAGE_MASK_4K)
-
-#define IOVA_PFN(addr)          ((addr) >> PAGE_SHIFT_4K)
-#define DMA_32BIT_PFN           IOVA_PFN(DMA_32BIT_MASK)
-#define DMA_64BIT_PFN           IOVA_PFN(DMA_64BIT_MASK)
+#include <asm/cacheflush.h>
+#include "dma_remapping.h"
 
 /*
  * Intel IOMMU register specification per version 1.0 public spec.
@@ -63,6 +52,11 @@
 #define DMAR_PLMLIMIT_REG 0x6c  /* PMRR low limit */
 #define DMAR_PHMBASE_REG 0x70   /* pmrr high base addr */
 #define DMAR_PHMLIMIT_REG 0x78  /* pmrr high limit */
+#define DMAR_IQH_REG    0x80    /* Invalidation queue head register */
+#define DMAR_IQT_REG    0x88    /* Invalidation queue tail register */
+#define DMAR_IQA_REG    0x90    /* Invalidation queue addr register */
+#define DMAR_ICS_REG    0x98    /* Invalidation complete status register */
+#define DMAR_IRTA_REG   0xb8    /* Interrupt remapping table addr register */
 
 #define OFFSET_STRIDE           (9)
 /*
@@ -126,6 +120,10 @@ static inline void dmar_writeq(void __iomem *addr, u64 val)
 #define ecap_max_iotlb_offset(e) \
         (ecap_iotlb_offset(e) + ecap_niotlb_iunits(e) * 16)
 #define ecap_coherent(e)        ((e) & 0x1)
+#define ecap_qis(e)             ((e) & 0x2)
+#define ecap_eim_support(e)     ((e >> 4) & 0x1)
+#define ecap_ir_support(e)      ((e >> 3) & 0x1)
+#define ecap_max_handle_mask(e) ((e >> 20) & 0xf)
 
 
 /* IOTLB_REG */
@@ -141,6 +139,17 @@ static inline void dmar_writeq(void __iomem *addr, u64 val)
 #define DMA_TLB_IH_NONLEAF (((u64)1) << 6)
 #define DMA_TLB_MAX_SIZE (0x3f)
 
+/* INVALID_DESC */
+#define DMA_ID_TLB_GLOBAL_FLUSH (((u64)1) << 3)
+#define DMA_ID_TLB_DSI_FLUSH    (((u64)2) << 3)
+#define DMA_ID_TLB_PSI_FLUSH    (((u64)3) << 3)
+#define DMA_ID_TLB_READ_DRAIN   (((u64)1) << 7)
+#define DMA_ID_TLB_WRITE_DRAIN  (((u64)1) << 6)
+#define DMA_ID_TLB_DID(id)      (((u64)((id & 0xffff) << 16)))
+#define DMA_ID_TLB_IH_NONLEAF   (((u64)1) << 6)
+#define DMA_ID_TLB_ADDR(addr)   (addr)
+#define DMA_ID_TLB_ADDR_MASK(mask)      (mask)
+
 /* PMEN_REG */
 #define DMA_PMEN_EPM (((u32)1)<<31)
 #define DMA_PMEN_PRS (((u32)1)<<0)
@@ -151,6 +160,9 @@ static inline void dmar_writeq(void __iomem *addr, u64 val)
 #define DMA_GCMD_SFL (((u32)1) << 29)
 #define DMA_GCMD_EAFL (((u32)1) << 28)
 #define DMA_GCMD_WBF (((u32)1) << 27)
+#define DMA_GCMD_QIE (((u32)1) << 26)
+#define DMA_GCMD_SIRTP (((u32)1) << 24)
+#define DMA_GCMD_IRE (((u32) 1) << 25)
 
 /* GSTS_REG */
 #define DMA_GSTS_TES (((u32)1) << 31)
@@ -158,6 +170,9 @@ static inline void dmar_writeq(void __iomem *addr, u64 val)
 #define DMA_GSTS_FLS (((u32)1) << 29)
 #define DMA_GSTS_AFLS (((u32)1) << 28)
 #define DMA_GSTS_WBFS (((u32)1) << 27)
+#define DMA_GSTS_QIES (((u32)1) << 26)
+#define DMA_GSTS_IRTPS (((u32)1) << 24)
+#define DMA_GSTS_IRES (((u32)1) << 25)
 
 /* CCMD_REG */
 #define DMA_CCMD_ICC (((u64)1) << 63)
@@ -187,158 +202,106 @@ static inline void dmar_writeq(void __iomem *addr, u64 val)
 #define dma_frcd_source_id(c) (c & 0xffff)
 #define dma_frcd_page_addr(d) (d & (((u64)-1) << 12)) /* low 64 bit */
 
-/*
- * 0: Present
- * 1-11: Reserved
- * 12-63: Context Ptr (12 - (haw-1))
- * 64-127: Reserved
- */
-struct root_entry {
-        u64     val;
-        u64     rsvd1;
-};
-#define ROOT_ENTRY_NR (PAGE_SIZE_4K/sizeof(struct root_entry))
-static inline bool root_present(struct root_entry *root)
-{
-        return (root->val & 1);
-}
-static inline void set_root_present(struct root_entry *root)
-{
-        root->val |= 1;
-}
-static inline void set_root_value(struct root_entry *root, unsigned long value)
-{
-        root->val |= value & PAGE_MASK_4K;
+#define DMAR_OPERATION_TIMEOUT ((cycles_t) tsc_khz*10*1000) /* 10sec */
+
+#define IOMMU_WAIT_OP(iommu, offset, op, cond, sts) \
+{\
+        cycles_t start_time = get_cycles();\
+        while (1) {\
+                sts = op (iommu->reg + offset);\
+                if (cond)\
+                        break;\
+                if (DMAR_OPERATION_TIMEOUT < (get_cycles() - start_time))\
+                        panic("DMAR hardware is malfunctioning\n");\
+                cpu_relax();\
+        }\
 }
 
-struct context_entry;
-static inline struct context_entry *
-get_context_addr_from_root(struct root_entry *root)
-{
-        return (struct context_entry *)
-                (root_present(root)?phys_to_virt(
-                root->val & PAGE_MASK_4K):
-                NULL);
-}
-
-/*
- * low 64 bits:
- * 0: present
- * 1: fault processing disable
- * 2-3: translation type
- * 12-63: address space root
- * high 64 bits:
- * 0-2: address width
- * 3-6: aval
- * 8-23: domain id
- */
-struct context_entry {
-        u64 lo;
-        u64 hi;
-};
-#define context_present(c) ((c).lo & 1)
-#define context_fault_disable(c) (((c).lo >> 1) & 1)
-#define context_translation_type(c) (((c).lo >> 2) & 3)
-#define context_address_root(c) ((c).lo & PAGE_MASK_4K)
-#define context_address_width(c) ((c).hi &  7)
-#define context_domain_id(c) (((c).hi >> 8) & ((1 << 16) - 1))
-
-#define context_set_present(c) do {(c).lo |= 1;} while (0)
-#define context_set_fault_enable(c) \
-        do {(c).lo &= (((u64)-1) << 2) | 1;} while (0)
-#define context_set_translation_type(c, val) \
-        do { \
-                (c).lo &= (((u64)-1) << 4) | 3; \
-                (c).lo |= ((val) & 3) << 2; \
-        } while (0)
-#define CONTEXT_TT_MULTI_LEVEL 0
-#define context_set_address_root(c, val) \
-        do {(c).lo |= (val) & PAGE_MASK_4K;} while (0)
-#define context_set_address_width(c, val) do {(c).hi |= (val) & 7;} while (0)
-#define context_set_domain_id(c, val) \
-        do {(c).hi |= ((val) & ((1 << 16) - 1)) << 8;} while (0)
-#define context_clear_entry(c) do {(c).lo = 0; (c).hi = 0;} while (0)
+#define QI_LENGTH       256     /* queue length */
 
-/*
- * 0: readable
- * 1: writable
- * 2-6: reserved
- * 7: super page
- * 8-11: available
- * 12-63: Host physcial address
- */
-struct dma_pte {
-        u64 val;
+enum {
+        QI_FREE,
+        QI_IN_USE,
+        QI_DONE
 };
-#define dma_clear_pte(p)        do {(p).val = 0;} while (0)
-
-#define DMA_PTE_READ (1)
-#define DMA_PTE_WRITE (2)
 
-#define dma_set_pte_readable(p) do {(p).val |= DMA_PTE_READ;} while (0)
-#define dma_set_pte_writable(p) do {(p).val |= DMA_PTE_WRITE;} while (0)
-#define dma_set_pte_prot(p, prot) \
-                do {(p).val = ((p).val & ~3) | ((prot) & 3); } while (0)
-#define dma_pte_addr(p) ((p).val & PAGE_MASK_4K)
-#define dma_set_pte_addr(p, addr) do {\
-                (p).val |= ((addr) & PAGE_MASK_4K); } while (0)
-#define dma_pte_present(p) (((p).val & 3) != 0)
+#define QI_CC_TYPE              0x1
+#define QI_IOTLB_TYPE           0x2
+#define QI_DIOTLB_TYPE          0x3
+#define QI_IEC_TYPE             0x4
+#define QI_IWD_TYPE             0x5
 
-struct intel_iommu;
+#define QI_IEC_SELECTIVE        (((u64)1) << 4)
+#define QI_IEC_IIDEX(idx)       (((u64)(idx & 0xffff) << 32))
+#define QI_IEC_IM(m)            (((u64)(m & 0x1f) << 27))
 
-struct dmar_domain {
-        int     id;                     /* domain id */
-        struct intel_iommu *iommu;      /* back pointer to owning iommu */
+#define QI_IWD_STATUS_DATA(d)   (((u64)d) << 32)
+#define QI_IWD_STATUS_WRITE     (((u64)1) << 5)
 
-        struct list_head devices;       /* all devices' list */
-        struct iova_domain iovad;       /* iova's that belong to this domain */
+struct qi_desc {
+        u64 low, high;
+};
 
-        struct dma_pte  *pgd;           /* virtual address */
-        spinlock_t      mapping_lock;   /* page table lock */
-        int             gaw;            /* max guest address width */
+struct q_inval {
+        spinlock_t      q_lock;
+        struct qi_desc  *desc;          /* invalidation queue */
+        int             *desc_status;   /* desc status */
+        int             free_head;      /* first free entry */
+        int             free_tail;      /* last free entry */
+        int             free_cnt;
+};
 
-        /* adjusted guest address width, 0 is level 2 30-bit */
-        int             agaw;
+#ifdef CONFIG_INTR_REMAP
+/* 1MB - maximum possible interrupt remapping table size */
+#define INTR_REMAP_PAGE_ORDER   8
+#define INTR_REMAP_TABLE_REG_SIZE       0xf
 
-#define DOMAIN_FLAG_MULTIPLE_DEVICES 1
-        int             flags;
-};
+#define INTR_REMAP_TABLE_ENTRIES        65536
 
-/* PCI domain-device relationship */
-struct device_domain_info {
-        struct list_head link;  /* link to domain siblings */
-        struct list_head global; /* link to global list */
-        u8 bus;                 /* PCI bus numer */
-        u8 devfn;               /* PCI devfn number */
-        struct pci_dev *dev; /* it's NULL for PCIE-to-PCI bridge */
-        struct dmar_domain *domain; /* pointer to domain */
+struct ir_table {
+        struct irte *base;
 };
-
-extern int init_dmars(void);
+#endif
 
 struct intel_iommu {
         void __iomem    *reg; /* Pointer to hardware regs, virtual addr */
         u64             cap;
         u64             ecap;
-        unsigned long   *domain_ids; /* bitmap of domains */
-        struct dmar_domain **domains; /* ptr to domains */
         int             seg;
         u32             gcmd; /* Holds TE, EAFL. Don't need SRTP, SFL, WBF */
-        spinlock_t      lock; /* protect context, domain ids */
         spinlock_t      register_lock; /* protect register handling */
+        int             seq_id; /* sequence id of the iommu */
+
+#ifdef CONFIG_DMAR
+        unsigned long   *domain_ids; /* bitmap of domains */
+        struct dmar_domain **domains; /* ptr to domains */
+        spinlock_t      lock; /* protect context, domain ids */
         struct root_entry *root_entry; /* virtual address */
 
         unsigned int irq;
         unsigned char name[7];    /* Device Name */
         struct msi_msg saved_msg;
         struct sys_device sysdev;
+#endif
+        struct q_inval  *qi;            /* Queued invalidation info */
+#ifdef CONFIG_INTR_REMAP
+        struct ir_table *ir_table;      /* Interrupt remapping info */
+#endif
 };
 
-#ifndef CONFIG_DMAR_GFX_WA
-static inline void iommu_prepare_gfx_mapping(void)
+static inline void __iommu_flush_cache(
+        struct intel_iommu *iommu, void *addr, int size)
 {
-        return;
+        if (!ecap_coherent(iommu->ecap))
+                clflush_cache_range(addr, size);
 }
-#endif /* !CONFIG_DMAR_GFX_WA */
 
+extern struct dmar_drhd_unit * dmar_find_matched_drhd_unit(struct pci_dev *dev);
+
+extern int alloc_iommu(struct dmar_drhd_unit *drhd);
+extern void free_iommu(struct intel_iommu *iommu);
+extern int dmar_enable_qi(struct intel_iommu *iommu);
+extern void qi_global_iec(struct intel_iommu *iommu);
+
+extern void qi_submit_sync(struct qi_desc *desc, struct intel_iommu *iommu);
 #endif
diff --git a/drivers/pci/intr_remapping.c b/drivers/pci/intr_remapping.c
new file mode 100644
index 000000000000..bb642cc5e18c
--- /dev/null
+++ b/drivers/pci/intr_remapping.c
@@ -0,0 +1,471 @@
+#include <linux/dmar.h>
+#include <linux/spinlock.h>
+#include <linux/jiffies.h>
+#include <linux/pci.h>
+#include <linux/irq.h>
+#include <asm/io_apic.h>
+#include "intel-iommu.h"
+#include "intr_remapping.h"
+
+static struct ioapic_scope ir_ioapic[MAX_IO_APICS];
+static int ir_ioapic_num;
+int intr_remapping_enabled;
+
+static struct {
+        struct intel_iommu *iommu;
+        u16 irte_index;
+        u16 sub_handle;
+        u8  irte_mask;
+} irq_2_iommu[NR_IRQS];
+
+static DEFINE_SPINLOCK(irq_2_ir_lock);
+
+int irq_remapped(int irq)
+{
+        if (irq > NR_IRQS)
+                return 0;
+
+        if (!irq_2_iommu[irq].iommu)
+                return 0;
+
+        return 1;
+}
+
+int get_irte(int irq, struct irte *entry)
+{
+        int index;
+
+        if (!entry || irq > NR_IRQS)
+                return -1;
+
+        spin_lock(&irq_2_ir_lock);
+        if (!irq_2_iommu[irq].iommu) {
+                spin_unlock(&irq_2_ir_lock);
+                return -1;
+        }
+
+        index = irq_2_iommu[irq].irte_index + irq_2_iommu[irq].sub_handle;
+        *entry = *(irq_2_iommu[irq].iommu->ir_table->base + index);
+
+        spin_unlock(&irq_2_ir_lock);
+        return 0;
+}
+
+int alloc_irte(struct intel_iommu *iommu, int irq, u16 count)
+{
+        struct ir_table *table = iommu->ir_table;
+        u16 index, start_index;
+        unsigned int mask = 0;
+        int i;
+
+        if (!count)
+                return -1;
+
+        /*
+         * start the IRTE search from index 0.
+         */
+        index = start_index = 0;
+
+        if (count > 1) {
+                count = __roundup_pow_of_two(count);
+                mask = ilog2(count);
+        }
+
+        if (mask > ecap_max_handle_mask(iommu->ecap)) {
+                printk(KERN_ERR
+                       "Requested mask %x exceeds the max invalidation handle"
+                       " mask value %Lx\n", mask,
+                       ecap_max_handle_mask(iommu->ecap));
+                return -1;
+        }
+
+        spin_lock(&irq_2_ir_lock);
+        do {
+                for (i = index; i < index + count; i++)
+                        if  (table->base[i].present)
+                                break;
+                /* empty index found */
+                if (i == index + count)
+                        break;
+
+                index = (index + count) % INTR_REMAP_TABLE_ENTRIES;
+
+                if (index == start_index) {
+                        spin_unlock(&irq_2_ir_lock);
+                        printk(KERN_ERR "can't allocate an IRTE\n");
+                        return -1;
+                }
+        } while (1);
+
+        for (i = index; i < index + count; i++)
+                table->base[i].present = 1;
+
+        irq_2_iommu[irq].iommu = iommu;
+        irq_2_iommu[irq].irte_index =  index;
+        irq_2_iommu[irq].sub_handle = 0;
+        irq_2_iommu[irq].irte_mask = mask;
+
+        spin_unlock(&irq_2_ir_lock);
+
+        return index;
+}
+
+static void qi_flush_iec(struct intel_iommu *iommu, int index, int mask)
+{
+        struct qi_desc desc;
+
+        desc.low = QI_IEC_IIDEX(index) | QI_IEC_TYPE | QI_IEC_IM(mask)
+                   | QI_IEC_SELECTIVE;
+        desc.high = 0;
+
+        qi_submit_sync(&desc, iommu);
+}
+
+int map_irq_to_irte_handle(int irq, u16 *sub_handle)
+{
+        int index;
+
+        spin_lock(&irq_2_ir_lock);
+        if (irq >= NR_IRQS || !irq_2_iommu[irq].iommu) {
+                spin_unlock(&irq_2_ir_lock);
+                return -1;
+        }
+
+        *sub_handle = irq_2_iommu[irq].sub_handle;
+        index = irq_2_iommu[irq].irte_index;
+        spin_unlock(&irq_2_ir_lock);
+        return index;
+}
+
+int set_irte_irq(int irq, struct intel_iommu *iommu, u16 index, u16 subhandle)
+{
+        spin_lock(&irq_2_ir_lock);
+        if (irq >= NR_IRQS || irq_2_iommu[irq].iommu) {
+                spin_unlock(&irq_2_ir_lock);
+                return -1;
+        }
+
+        irq_2_iommu[irq].iommu = iommu;
+        irq_2_iommu[irq].irte_index = index;
+        irq_2_iommu[irq].sub_handle = subhandle;
+        irq_2_iommu[irq].irte_mask = 0;
+
+        spin_unlock(&irq_2_ir_lock);
+
+        return 0;
+}
+
+int clear_irte_irq(int irq, struct intel_iommu *iommu, u16 index)
+{
+        spin_lock(&irq_2_ir_lock);
+        if (irq >= NR_IRQS || !irq_2_iommu[irq].iommu) {
+                spin_unlock(&irq_2_ir_lock);
+                return -1;
+        }
+
+        irq_2_iommu[irq].iommu = NULL;
+        irq_2_iommu[irq].irte_index = 0;
+        irq_2_iommu[irq].sub_handle = 0;
+        irq_2_iommu[irq].irte_mask = 0;
+
+        spin_unlock(&irq_2_ir_lock);
+
+        return 0;
+}
+
+int modify_irte(int irq, struct irte *irte_modified)
+{
+        int index;
+        struct irte *irte;
+        struct intel_iommu *iommu;
+
+        spin_lock(&irq_2_ir_lock);
+        if (irq >= NR_IRQS || !irq_2_iommu[irq].iommu) {
+                spin_unlock(&irq_2_ir_lock);
+                return -1;
+        }
+
+        iommu = irq_2_iommu[irq].iommu;
+
+        index = irq_2_iommu[irq].irte_index + irq_2_iommu[irq].sub_handle;
+        irte = &iommu->ir_table->base[index];
+
+        set_64bit((unsigned long *)irte, irte_modified->low | (1 << 1));
+        __iommu_flush_cache(iommu, irte, sizeof(*irte));
+
+        qi_flush_iec(iommu, index, 0);
+
+        spin_unlock(&irq_2_ir_lock);
+        return 0;
+}
+
+int flush_irte(int irq)
+{
+        int index;
+        struct intel_iommu *iommu;
+
+        spin_lock(&irq_2_ir_lock);
+        if (irq >= NR_IRQS || !irq_2_iommu[irq].iommu) {
+                spin_unlock(&irq_2_ir_lock);
+                return -1;
+        }
+
+        iommu = irq_2_iommu[irq].iommu;
+
+        index = irq_2_iommu[irq].irte_index + irq_2_iommu[irq].sub_handle;
+
+        qi_flush_iec(iommu, index, irq_2_iommu[irq].irte_mask);
+        spin_unlock(&irq_2_ir_lock);
+
+        return 0;
+}
+
+struct intel_iommu *map_ioapic_to_ir(int apic)
+{
+        int i;
+
+        for (i = 0; i < MAX_IO_APICS; i++)
+                if (ir_ioapic[i].id == apic)
+                        return ir_ioapic[i].iommu;
+        return NULL;
+}
+
+struct intel_iommu *map_dev_to_ir(struct pci_dev *dev)
+{
+        struct dmar_drhd_unit *drhd;
+
+        drhd = dmar_find_matched_drhd_unit(dev);
+        if (!drhd)
+                return NULL;
+
+        return drhd->iommu;
+}
+
+int free_irte(int irq)
+{
+        int index, i;
+        struct irte *irte;
+        struct intel_iommu *iommu;
+
+        spin_lock(&irq_2_ir_lock);
+        if (irq >= NR_IRQS || !irq_2_iommu[irq].iommu) {
+                spin_unlock(&irq_2_ir_lock);
+                return -1;
+        }
+
+        iommu = irq_2_iommu[irq].iommu;
+
+        index = irq_2_iommu[irq].irte_index + irq_2_iommu[irq].sub_handle;
+        irte = &iommu->ir_table->base[index];
+
+        if (!irq_2_iommu[irq].sub_handle) {
+                for (i = 0; i < (1 << irq_2_iommu[irq].irte_mask); i++)
+                        set_64bit((unsigned long *)irte, 0);
+                qi_flush_iec(iommu, index, irq_2_iommu[irq].irte_mask);
+        }
+
+        irq_2_iommu[irq].iommu = NULL;
+        irq_2_iommu[irq].irte_index = 0;
+        irq_2_iommu[irq].sub_handle = 0;
+        irq_2_iommu[irq].irte_mask = 0;
+
+        spin_unlock(&irq_2_ir_lock);
+
+        return 0;
+}
+
+static void iommu_set_intr_remapping(struct intel_iommu *iommu, int mode)
+{
+        u64 addr;
+        u32 cmd, sts;
+        unsigned long flags;
+
+        addr = virt_to_phys((void *)iommu->ir_table->base);
+
+        spin_lock_irqsave(&iommu->register_lock, flags);
+
+        dmar_writeq(iommu->reg + DMAR_IRTA_REG,
+                    (addr) | IR_X2APIC_MODE(mode) | INTR_REMAP_TABLE_REG_SIZE);
+
+        /* Set interrupt-remapping table pointer */
+        cmd = iommu->gcmd | DMA_GCMD_SIRTP;
+        writel(cmd, iommu->reg + DMAR_GCMD_REG);
+
+        IOMMU_WAIT_OP(iommu, DMAR_GSTS_REG,
+                      readl, (sts & DMA_GSTS_IRTPS), sts);
+        spin_unlock_irqrestore(&iommu->register_lock, flags);
+
+        /*
+         * global invalidation of interrupt entry cache before enabling
+         * interrupt-remapping.
+         */
+        qi_global_iec(iommu);
+
+        spin_lock_irqsave(&iommu->register_lock, flags);
+
+        /* Enable interrupt-remapping */
+        cmd = iommu->gcmd | DMA_GCMD_IRE;
+        iommu->gcmd |= DMA_GCMD_IRE;
+        writel(cmd, iommu->reg + DMAR_GCMD_REG);
+
+        IOMMU_WAIT_OP(iommu, DMAR_GSTS_REG,
+                      readl, (sts & DMA_GSTS_IRES), sts);
+
+        spin_unlock_irqrestore(&iommu->register_lock, flags);
+}
+
+
+static int setup_intr_remapping(struct intel_iommu *iommu, int mode)
+{
+        struct ir_table *ir_table;
+        struct page *pages;
+
+        ir_table = iommu->ir_table = kzalloc(sizeof(struct ir_table),
+                                             GFP_KERNEL);
+
+        if (!iommu->ir_table)
+                return -ENOMEM;
+
+        pages = alloc_pages(GFP_KERNEL | __GFP_ZERO, INTR_REMAP_PAGE_ORDER);
+
+        if (!pages) {
+                printk(KERN_ERR "failed to allocate pages of order %d\n",
+                       INTR_REMAP_PAGE_ORDER);
+                kfree(iommu->ir_table);
+                return -ENOMEM;
+        }
+
+        ir_table->base = page_address(pages);
+
+        iommu_set_intr_remapping(iommu, mode);
+        return 0;
+}
+
+int __init enable_intr_remapping(int eim)
+{
+        struct dmar_drhd_unit *drhd;
+        int setup = 0;
+
+        /*
+         * check for the Interrupt-remapping support
+         */
+        for_each_drhd_unit(drhd) {
+                struct intel_iommu *iommu = drhd->iommu;
+
+                if (!ecap_ir_support(iommu->ecap))
+                        continue;
+
+                if (eim && !ecap_eim_support(iommu->ecap)) {
+                        printk(KERN_INFO "DRHD %Lx: EIM not supported by DRHD, "
+                               " ecap %Lx\n", drhd->reg_base_addr, iommu->ecap);
+                        return -1;
+                }
+        }
+
+        /*
+         * Enable queued invalidation for all the DRHD's.
+         */
+        for_each_drhd_unit(drhd) {
+                int ret;
+                struct intel_iommu *iommu = drhd->iommu;
+                ret = dmar_enable_qi(iommu);
+
+                if (ret) {
+                        printk(KERN_ERR "DRHD %Lx: failed to enable queued, "
+                               " invalidation, ecap %Lx, ret %d\n",
+                               drhd->reg_base_addr, iommu->ecap, ret);
+                        return -1;
+                }
+        }
+
+        /*
+         * Setup Interrupt-remapping for all the DRHD's now.
+         */
+        for_each_drhd_unit(drhd) {
+                struct intel_iommu *iommu = drhd->iommu;
+
+                if (!ecap_ir_support(iommu->ecap))
+                        continue;
+
+                if (setup_intr_remapping(iommu, eim))
+                        goto error;
+
+                setup = 1;
+        }
+
+        if (!setup)
+                goto error;
+
+        intr_remapping_enabled = 1;
+
+        return 0;
+
+error:
+        /*
+         * handle error condition gracefully here!
+         */
+        return -1;
+}
+
+static int ir_parse_ioapic_scope(struct acpi_dmar_header *header,
+                                 struct intel_iommu *iommu)
+{
+        struct acpi_dmar_hardware_unit *drhd;
+        struct acpi_dmar_device_scope *scope;
+        void *start, *end;
+
+        drhd = (struct acpi_dmar_hardware_unit *)header;
+
+        start = (void *)(drhd + 1);
+        end = ((void *)drhd) + header->length;
+
+        while (start < end) {
+                scope = start;
+                if (scope->entry_type == ACPI_DMAR_SCOPE_TYPE_IOAPIC) {
+                        if (ir_ioapic_num == MAX_IO_APICS) {
+                                printk(KERN_WARNING "Exceeded Max IO APICS\n");
+                                return -1;
+                        }
+
+                        printk(KERN_INFO "IOAPIC id %d under DRHD base"
+                               " 0x%Lx\n", scope->enumeration_id,
+                               drhd->address);
+
+                        ir_ioapic[ir_ioapic_num].iommu = iommu;
+                        ir_ioapic[ir_ioapic_num].id = scope->enumeration_id;
+                        ir_ioapic_num++;
+                }
+                start += scope->length;
+        }
+
+        return 0;
+}
+
+/*
+ * Finds the assocaition between IOAPIC's and its Interrupt-remapping
+ * hardware unit.
+ */
+int __init parse_ioapics_under_ir(void)
+{
+        struct dmar_drhd_unit *drhd;
+        int ir_supported = 0;
+
+        for_each_drhd_unit(drhd) {
+                struct intel_iommu *iommu = drhd->iommu;
+
+                if (ecap_ir_support(iommu->ecap)) {
+                        if (ir_parse_ioapic_scope(drhd->hdr, iommu))
+                                return -1;
+
+                        ir_supported = 1;
+                }
+        }
+
+        if (ir_supported && ir_ioapic_num != nr_ioapics) {
+                printk(KERN_WARNING
+                       "Not all IO-APIC's listed under remapping hardware\n");
+                return -1;
+        }
+
+        return ir_supported;
+}
diff --git a/drivers/pci/intr_remapping.h b/drivers/pci/intr_remapping.h
new file mode 100644
index 000000000000..05f2635bbe4e
--- /dev/null
+++ b/drivers/pci/intr_remapping.h
@@ -0,0 +1,8 @@
+#include "intel-iommu.h"
+
+struct ioapic_scope {
+        struct intel_iommu *iommu;
+        unsigned int id;
+};
+
+#define IR_X2APIC_MODE(mode) (mode ? (1 << 11) : 0)
diff --git a/include/asm-x86/apic.h b/include/asm-x86/apic.h
index 65590c9aecd4..d76a0839abe9 100644
--- a/include/asm-x86/apic.h
+++ b/include/asm-x86/apic.h
@@ -9,6 +9,8 @@
 #include <asm/apicdef.h>
 #include <asm/processor.h>
 #include <asm/system.h>
+#include <asm/cpufeature.h>
+#include <asm/msr.h>
 
 #define ARCH_APICTIMER_STOPS_ON_C3      1
 
@@ -47,8 +49,6 @@ extern int disable_apic;
 #ifdef CONFIG_PARAVIRT
 #include <asm/paravirt.h>
 #else
-#define apic_write native_apic_write
-#define apic_read native_apic_read
 #define setup_boot_clock setup_boot_APIC_clock
 #define setup_secondary_clock setup_secondary_APIC_clock
 #endif
@@ -60,7 +60,7 @@ extern u64 xapic_icr_read(void);
 extern void xapic_icr_write(u32, u32);
 extern int setup_profiling_timer(unsigned int);
 
-static inline void native_apic_write(unsigned long reg, u32 v)
+static inline void native_apic_mem_write(u32 reg, u32 v)
 {
         volatile u32 *addr = (volatile u32 *)(APIC_BASE + reg);
 
@@ -69,15 +69,68 @@ static inline void native_apic_write(unsigned long reg, u32 v)
                        ASM_OUTPUT2("0" (v), "m" (*addr)));
 }
 
-static inline u32 native_apic_read(unsigned long reg)
+static inline u32 native_apic_mem_read(u32 reg)
 {
         return *((volatile u32 *)(APIC_BASE + reg));
 }
 
-extern void apic_wait_icr_idle(void);
-extern u32 safe_apic_wait_icr_idle(void);
+static inline void native_apic_msr_write(u32 reg, u32 v)
+{
+        if (reg == APIC_DFR || reg == APIC_ID || reg == APIC_LDR ||
+            reg == APIC_LVR)
+                return;
+
+        wrmsr(APIC_BASE_MSR + (reg >> 4), v, 0);
+}
+
+static inline u32 native_apic_msr_read(u32 reg)
+{
+        u32 low, high;
+
+        if (reg == APIC_DFR)
+                return -1;
+
+        rdmsr(APIC_BASE_MSR + (reg >> 4), low, high);
+        return low;
+}
+
+#ifndef CONFIG_X86_32
+extern int x2apic, x2apic_preenabled;
+extern void check_x2apic(void);
+extern void enable_x2apic(void);
+extern void enable_IR_x2apic(void);
+extern void x2apic_icr_write(u32 low, u32 id);
+#endif
+
+struct apic_ops {
+        u32 (*read)(u32 reg);
+        void (*write)(u32 reg, u32 v);
+        u64 (*icr_read)(void);
+        void (*icr_write)(u32 low, u32 high);
+        void (*wait_icr_idle)(void);
+        u32 (*safe_wait_icr_idle)(void);
+};
+
+extern struct apic_ops *apic_ops;
+
+#define apic_read (apic_ops->read)
+#define apic_write (apic_ops->write)
+#define apic_icr_read (apic_ops->icr_read)
+#define apic_icr_write (apic_ops->icr_write)
+#define apic_wait_icr_idle (apic_ops->wait_icr_idle)
+#define safe_apic_wait_icr_idle (apic_ops->safe_wait_icr_idle)
+
 extern int get_physical_broadcast(void);
 
+#ifdef CONFIG_X86_64
+static inline void ack_x2APIC_irq(void)
+{
+        /* Docs say use 0 for future compatibility */
+        native_apic_msr_write(APIC_EOI, 0);
+}
+#endif
+
+
 static inline void ack_APIC_irq(void)
 {
         /*
diff --git a/include/asm-x86/apicdef.h b/include/asm-x86/apicdef.h
index c40687da20fc..b922c85ac91d 100644
--- a/include/asm-x86/apicdef.h
+++ b/include/asm-x86/apicdef.h
@@ -105,6 +105,7 @@
 #define APIC_TMICT      0x380
 #define APIC_TMCCT      0x390
 #define APIC_TDCR       0x3E0
+#define APIC_SELF_IPI   0x3F0
 #define         APIC_TDR_DIV_TMBASE     (1 << 2)
 #define         APIC_TDR_DIV_1          0xB
 #define         APIC_TDR_DIV_2          0x0
@@ -128,6 +129,8 @@
 #define APIC_EILVT3     0x530
 
 #define APIC_BASE (fix_to_virt(FIX_APIC_BASE))
+#define APIC_BASE_MSR   0x800
+#define X2APIC_ENABLE   (1UL << 10)
 
 #ifdef CONFIG_X86_32
 # define MAX_IO_APICS 64
diff --git a/include/asm-x86/arch_hooks.h b/include/asm-x86/arch_hooks.h
index 72adc3a109cc..de4596b24c23 100644
--- a/include/asm-x86/arch_hooks.h
+++ b/include/asm-x86/arch_hooks.h
@@ -12,8 +12,6 @@
 /* these aren't arch hooks, they are generic routines
  * that can be used by the hooks */
 extern void init_ISA_irqs(void);
-extern void apic_intr_init(void);
-extern void smp_intr_init(void);
 extern irqreturn_t timer_interrupt(int irq, void *dev_id);
 
 /* these are the defined hooks */
diff --git a/include/asm-x86/mach-bigsmp/mach_apic.h b/include/asm-x86/bigsmp/apic.h
index 05362d44a3ee..0a9cd7c5ca0c 100644
--- a/include/asm-x86/mach-bigsmp/mach_apic.h
+++ b/include/asm-x86/bigsmp/apic.h
@@ -1,5 +1,5 @@
-#ifndef ASM_X86__MACH_BIGSMP__MACH_APIC_H
-#define ASM_X86__MACH_BIGSMP__MACH_APIC_H
+#ifndef __ASM_MACH_APIC_H
+#define __ASM_MACH_APIC_H
 
 #define xapic_phys_to_log_apicid(cpu) (per_cpu(x86_bios_cpu_apicid, cpu))
 #define esr_disable (1)
@@ -11,7 +11,7 @@ static inline int apic_id_registered(void)
 
 /* Round robin the irqs amoung the online cpus */
 static inline cpumask_t target_cpus(void)
-{ 
+{
         static unsigned long cpu = NR_CPUS;
         do {
                 if (cpu >= NR_CPUS)
@@ -23,7 +23,7 @@ static inline cpumask_t target_cpus(void)
 }
 
 #undef APIC_DEST_LOGICAL
-#define APIC_DEST_LOGICAL       0
+#define APIC_DEST_LOGICAL       0
 #define TARGET_CPUS             (target_cpus())
 #define APIC_DFR_VALUE          (APIC_DFR_FLAT)
 #define INT_DELIVERY_MODE       (dest_Fixed)
@@ -141,4 +141,4 @@ static inline u32 phys_pkg_id(u32 cpuid_apic, int index_msb)
         return cpuid_apic >> index_msb;
 }
 
-#endif /* ASM_X86__MACH_BIGSMP__MACH_APIC_H */
+#endif /* __ASM_MACH_APIC_H */
diff --git a/include/asm-x86/bigsmp/apicdef.h b/include/asm-x86/bigsmp/apicdef.h
new file mode 100644
index 000000000000..392c3f5ef2fe
--- /dev/null
+++ b/include/asm-x86/bigsmp/apicdef.h
@@ -0,0 +1,13 @@
+#ifndef __ASM_MACH_APICDEF_H
+#define __ASM_MACH_APICDEF_H
+
+#define         APIC_ID_MASK            (0xFF<<24)
+
+static inline unsigned get_apic_id(unsigned long x)
+{
+        return (((x)>>24)&0xFF);
+}
+
+#define         GET_APIC_ID(x)  get_apic_id(x)
+
+#endif
diff --git a/include/asm-x86/mach-bigsmp/mach_ipi.h b/include/asm-x86/bigsmp/ipi.h
index b1b0f966a009..9404c535b7ec 100644
--- a/include/asm-x86/mach-bigsmp/mach_ipi.h
+++ b/include/asm-x86/bigsmp/ipi.h
@@ -1,5 +1,5 @@
-#ifndef ASM_X86__MACH_BIGSMP__MACH_IPI_H
-#define ASM_X86__MACH_BIGSMP__MACH_IPI_H
+#ifndef __ASM_MACH_IPI_H
+#define __ASM_MACH_IPI_H
 
 void send_IPI_mask_sequence(cpumask_t mask, int vector);
 
@@ -22,4 +22,4 @@ static inline void send_IPI_all(int vector)
         send_IPI_mask(cpu_online_map, vector);
 }
 
-#endif /* ASM_X86__MACH_BIGSMP__MACH_IPI_H */
+#endif /* __ASM_MACH_IPI_H */
diff --git a/include/asm-x86/cpufeature.h b/include/asm-x86/cpufeature.h
index 250fa0cb144b..065c6a86ed80 100644
--- a/include/asm-x86/cpufeature.h
+++ b/include/asm-x86/cpufeature.h
@@ -93,6 +93,7 @@
 #define X86_FEATURE_CX16        (4*32+13) /* CMPXCHG16B */
 #define X86_FEATURE_XTPR        (4*32+14) /* Send Task Priority Messages */
 #define X86_FEATURE_DCA         (4*32+18) /* Direct Cache Access */
+#define X86_FEATURE_X2APIC      (4*32+21) /* x2APIC */
 #define X86_FEATURE_XMM4_2      (4*32+20) /* Streaming SIMD Extensions-4.2 */
 
 /* VIA/Cyrix/Centaur-defined CPU features, CPUID level 0xC0000001, word 5 */
@@ -192,6 +193,7 @@ extern const char * const x86_power_flags[32];
 #define cpu_has_gbpages         boot_cpu_has(X86_FEATURE_GBPAGES)
 #define cpu_has_arch_perfmon    boot_cpu_has(X86_FEATURE_ARCH_PERFMON)
 #define cpu_has_pat             boot_cpu_has(X86_FEATURE_PAT)
+#define cpu_has_x2apic          boot_cpu_has(X86_FEATURE_X2APIC)
 #define cpu_has_xmm4_2          boot_cpu_has(X86_FEATURE_XMM4_2)
 
 #if defined(CONFIG_X86_INVLPG) || defined(CONFIG_X86_64)
diff --git a/include/asm-x86/mach-es7000/mach_apic.h b/include/asm-x86/es7000/apic.h
index c1f6f682d619..bd2c44d1f7ac 100644
--- a/include/asm-x86/mach-es7000/mach_apic.h
+++ b/include/asm-x86/es7000/apic.h
@@ -1,5 +1,5 @@
-#ifndef ASM_X86__MACH_ES7000__MACH_APIC_H
-#define ASM_X86__MACH_ES7000__MACH_APIC_H
+#ifndef __ASM_ES7000_APIC_H
+#define __ASM_ES7000_APIC_H
 
 #define xapic_phys_to_log_apicid(cpu) per_cpu(x86_bios_cpu_apicid, cpu)
 #define esr_disable (1)
@@ -10,7 +10,7 @@ static inline int apic_id_registered(void)
 }
 
 static inline cpumask_t target_cpus(void)
-{ 
+{
 #if defined CONFIG_ES7000_CLUSTERED_APIC
         return CPU_MASK_ALL;
 #else
@@ -23,24 +23,24 @@ static inline cpumask_t target_cpus(void)
 #define APIC_DFR_VALUE          (APIC_DFR_CLUSTER)
 #define INT_DELIVERY_MODE       (dest_LowestPrio)
 #define INT_DEST_MODE           (1)    /* logical delivery broadcast to all procs */
-#define NO_BALANCE_IRQ          (1)
+#define NO_BALANCE_IRQ          (1)
 #undef  WAKE_SECONDARY_VIA_INIT
 #define WAKE_SECONDARY_VIA_MIP
 #else
 #define APIC_DFR_VALUE          (APIC_DFR_FLAT)
 #define INT_DELIVERY_MODE       (dest_Fixed)
 #define INT_DEST_MODE           (0)    /* phys delivery to target procs */
-#define NO_BALANCE_IRQ          (0)
+#define NO_BALANCE_IRQ          (0)
 #undef  APIC_DEST_LOGICAL
 #define APIC_DEST_LOGICAL       0x0
 #define WAKE_SECONDARY_VIA_INIT
 #endif
 
 static inline unsigned long check_apicid_used(physid_mask_t bitmap, int apicid)
-{ 
+{
         return 0;
-} 
-static inline unsigned long check_apicid_present(int bit) 
+}
+static inline unsigned long check_apicid_present(int bit)
 {
         return physid_isset(bit, phys_cpu_present_map);
 }
@@ -80,7 +80,7 @@ static inline void setup_apic_routing(void)
 {
         int apic = per_cpu(x86_bios_cpu_apicid, smp_processor_id());
         printk("Enabling APIC mode:  %s.  Using %d I/O APICs, target cpus %lx\n",
-                (apic_version[apic] == 0x14) ? 
+                (apic_version[apic] == 0x14) ?
                 "Physical Cluster" : "Logical Cluster", nr_ioapics, cpus_addr(TARGET_CPUS)[0]);
 }
 
@@ -141,7 +141,7 @@ static inline void setup_portio_remap(void)
 extern unsigned int boot_cpu_physical_apicid;
 static inline int check_phys_apicid_present(int cpu_physical_apicid)
 {
-        boot_cpu_physical_apicid = GET_APIC_ID(read_apic_id());
+        boot_cpu_physical_apicid = read_apic_id();
         return (1);
 }
 
@@ -150,7 +150,7 @@ static inline unsigned int cpu_mask_to_apicid(cpumask_t cpumask)
         int num_bits_set;
         int cpus_found = 0;
         int cpu;
-        int apicid;     
+        int apicid;
 
         num_bits_set = cpus_weight(cpumask);
         /* Return id to all */
@@ -160,16 +160,16 @@ static inline unsigned int cpu_mask_to_apicid(cpumask_t cpumask)
 #else
                 return cpu_to_logical_apicid(0);
 #endif
-        /* 
-         * The cpus in the mask must all be on the apic cluster.  If are not 
-         * on the same apicid cluster return default value of TARGET_CPUS. 
+        /*
+         * The cpus in the mask must all be on the apic cluster.  If are not
+         * on the same apicid cluster return default value of TARGET_CPUS.
          */
         cpu = first_cpu(cpumask);
         apicid = cpu_to_logical_apicid(cpu);
         while (cpus_found < num_bits_set) {
                 if (cpu_isset(cpu, cpumask)) {
                         int new_apicid = cpu_to_logical_apicid(cpu);
-                        if (apicid_cluster(apicid) != 
+                        if (apicid_cluster(apicid) !=
                                         apicid_cluster(new_apicid)){
                                 printk ("%s: Not a valid mask!\n",__FUNCTION__);
 #if defined CONFIG_ES7000_CLUSTERED_APIC
@@ -191,4 +191,4 @@ static inline u32 phys_pkg_id(u32 cpuid_apic, int index_msb)
         return cpuid_apic >> index_msb;
 }
 
-#endif /* ASM_X86__MACH_ES7000__MACH_APIC_H */
+#endif /* __ASM_ES7000_APIC_H */
diff --git a/include/asm-x86/es7000/apicdef.h b/include/asm-x86/es7000/apicdef.h
new file mode 100644
index 000000000000..8b234a3cb851
--- /dev/null
+++ b/include/asm-x86/es7000/apicdef.h
@@ -0,0 +1,13 @@
+#ifndef __ASM_ES7000_APICDEF_H
+#define __ASM_ES7000_APICDEF_H
+
+#define         APIC_ID_MASK            (0xFF<<24)
+
+static inline unsigned get_apic_id(unsigned long x)
+{
+        return (((x)>>24)&0xFF);
+}
+
+#define         GET_APIC_ID(x)  get_apic_id(x)
+
+#endif
diff --git a/include/asm-x86/mach-es7000/mach_ipi.h b/include/asm-x86/es7000/ipi.h
index 3a21240e03dc..632a955fcc0a 100644
--- a/include/asm-x86/mach-es7000/mach_ipi.h
+++ b/include/asm-x86/es7000/ipi.h
@@ -1,5 +1,5 @@
-#ifndef ASM_X86__MACH_ES7000__MACH_IPI_H
-#define ASM_X86__MACH_ES7000__MACH_IPI_H
+#ifndef __ASM_ES7000_IPI_H
+#define __ASM_ES7000_IPI_H
 
 void send_IPI_mask_sequence(cpumask_t mask, int vector);
 
@@ -21,4 +21,4 @@ static inline void send_IPI_all(int vector)
         send_IPI_mask(cpu_online_map, vector);
 }
 
-#endif /* ASM_X86__MACH_ES7000__MACH_IPI_H */
+#endif /* __ASM_ES7000_IPI_H */
diff --git a/include/asm-x86/mach-es7000/mach_mpparse.h b/include/asm-x86/es7000/mpparse.h
index befde24705b7..7b5c889d8e7d 100644
--- a/include/asm-x86/mach-es7000/mach_mpparse.h
+++ b/include/asm-x86/es7000/mpparse.h
@@ -1,5 +1,5 @@
-#ifndef ASM_X86__MACH_ES7000__MACH_MPPARSE_H
-#define ASM_X86__MACH_ES7000__MACH_MPPARSE_H
+#ifndef __ASM_ES7000_MPPARSE_H
+#define __ASM_ES7000_MPPARSE_H
 
 #include <linux/acpi.h>
 
@@ -26,4 +26,4 @@ static inline int es7000_check_dsdt(void)
 }
 #endif
 
-#endif /* ASM_X86__MACH_ES7000__MACH_MPPARSE_H */
+#endif /* __ASM_MACH_MPPARSE_H */
diff --git a/include/asm-x86/mach-es7000/mach_wakecpu.h b/include/asm-x86/es7000/wakecpu.h
index 97c776ce13f2..3ffc5a7bf667 100644
--- a/include/asm-x86/mach-es7000/mach_wakecpu.h
+++ b/include/asm-x86/es7000/wakecpu.h
@@ -1,7 +1,7 @@
-#ifndef ASM_X86__MACH_ES7000__MACH_WAKECPU_H
-#define ASM_X86__MACH_ES7000__MACH_WAKECPU_H
+#ifndef __ASM_ES7000_WAKECPU_H
+#define __ASM_ES7000_WAKECPU_H
 
-/* 
+/*
  * This file copes with machines that wakeup secondary CPUs by the
  * INIT, INIT, STARTUP sequence.
  */
@@ -56,4 +56,4 @@ static inline void restore_NMI_vector(unsigned short *high, unsigned short *low)
  #define inquire_remote_apic(apicid) {}
 #endif
 
-#endif /* ASM_X86__MACH_ES7000__MACH_WAKECPU_H */
+#endif /* __ASM_MACH_WAKECPU_H */
diff --git a/include/asm-x86/genapic_64.h b/include/asm-x86/genapic_64.h
index 25097a8cc5ef..ed6a4886c082 100644
--- a/include/asm-x86/genapic_64.h
+++ b/include/asm-x86/genapic_64.h
@@ -14,6 +14,7 @@
 
 struct genapic {
         char *name;
+        int (*acpi_madt_oem_check)(char *oem_id, char *oem_table_id);
         u32 int_delivery_mode;
         u32 int_dest_mode;
         int (*apic_id_registered)(void);
@@ -24,17 +25,24 @@ struct genapic {
         void (*send_IPI_mask)(cpumask_t mask, int vector);
         void (*send_IPI_allbutself)(int vector);
         void (*send_IPI_all)(int vector);
+        void (*send_IPI_self)(int vector);
         /* */
         unsigned int (*cpu_mask_to_apicid)(cpumask_t cpumask);
         unsigned int (*phys_pkg_id)(int index_msb);
+        unsigned int (*get_apic_id)(unsigned long x);
+        unsigned long (*set_apic_id)(unsigned int id);
+        unsigned long apic_id_mask;
 };
 
 extern struct genapic *genapic;
 
 extern struct genapic apic_flat;
 extern struct genapic apic_physflat;
+extern struct genapic apic_x2apic_cluster;
+extern struct genapic apic_x2apic_phys;
 extern int acpi_madt_oem_check(char *, char *);
 
+extern void apic_send_IPI_self(int vector);
 enum uv_system_type {UV_NONE, UV_LEGACY_APIC, UV_X2APIC, UV_NON_UNIQUE_APIC};
 extern enum uv_system_type get_uv_system_type(void);
 extern int is_uv_system(void);
diff --git a/include/asm-x86/hw_irq.h b/include/asm-x86/hw_irq.h
index 65997b15d56a..50f6e0316b50 100644
--- a/include/asm-x86/hw_irq.h
+++ b/include/asm-x86/hw_irq.h
@@ -64,7 +64,6 @@ extern unsigned long io_apic_irqs;
 extern void init_VISWS_APIC_irqs(void);
 extern void setup_IO_APIC(void);
 extern void disable_IO_APIC(void);
-extern void print_IO_APIC(void);
 extern int IO_APIC_get_PCI_irq_vector(int bus, int slot, int fn);
 extern void setup_ioapic_dest(void);
 
@@ -73,7 +72,9 @@ extern void enable_IO_APIC(void);
 #endif
 
 /* IPI functions */
+#ifdef CONFIG_X86_32
 extern void send_IPI_self(int vector);
+#endif
 extern void send_IPI(int dest, int vector);
 
 /* Statistics */
diff --git a/include/asm-x86/i8259.h b/include/asm-x86/i8259.h
index c586559a6957..23c1b3baaecd 100644
--- a/include/asm-x86/i8259.h
+++ b/include/asm-x86/i8259.h
@@ -57,4 +57,7 @@ static inline void outb_pic(unsigned char value, unsigned int port)
 
 extern struct irq_chip i8259A_chip;
 
+extern void mask_8259A(void);
+extern void unmask_8259A(void);
+
 #endif /* ASM_X86__I8259_H */
diff --git a/include/asm-x86/io_apic.h b/include/asm-x86/io_apic.h
index be62847ab07e..8ec68a50cf10 100644
--- a/include/asm-x86/io_apic.h
+++ b/include/asm-x86/io_apic.h
@@ -107,6 +107,20 @@ struct IO_APIC_route_entry {
 
 } __attribute__ ((packed));
 
+struct IR_IO_APIC_route_entry {
+        __u64   vector          : 8,
+                zero            : 3,
+                index2          : 1,
+                delivery_status : 1,
+                polarity        : 1,
+                irr             : 1,
+                trigger         : 1,
+                mask            : 1,
+                reserved        : 31,
+                format          : 1,
+                index           : 15;
+} __attribute__ ((packed));
+
 #ifdef CONFIG_X86_IO_APIC
 
 /*
@@ -183,6 +197,12 @@ extern int io_apic_set_pci_routing(int ioapic, int pin, int irq,
 extern int (*ioapic_renumber_irq)(int ioapic, int irq);
 extern void ioapic_init_mappings(void);
 
+#ifdef CONFIG_X86_64
+extern int save_mask_IO_APIC_setup(void);
+extern void restore_IO_APIC_setup(void);
+extern void reinit_intr_remapped_IO_APIC(int);
+#endif
+
 #else  /* !CONFIG_X86_IO_APIC */
 #define io_apic_assign_pci_irqs 0
 static const int timer_through_8259 = 0;
diff --git a/include/asm-x86/ipi.h b/include/asm-x86/ipi.h
index c1b226797518..30a692cfaff8 100644
--- a/include/asm-x86/ipi.h
+++ b/include/asm-x86/ipi.h
@@ -49,6 +49,12 @@ static inline int __prepare_ICR2(unsigned int mask)
         return SET_APIC_DEST_FIELD(mask);
 }
 
+static inline void __xapic_wait_icr_idle(void)
+{
+        while (native_apic_mem_read(APIC_ICR) & APIC_ICR_BUSY)
+                cpu_relax();
+}
+
 static inline void __send_IPI_shortcut(unsigned int shortcut, int vector,
                                        unsigned int dest)
 {
@@ -64,7 +70,7 @@ static inline void __send_IPI_shortcut(unsigned int shortcut, int vector,
         /*
          * Wait for idle.
          */
-        apic_wait_icr_idle();
+        __xapic_wait_icr_idle();
 
         /*
          * No need to touch the target chip field
@@ -74,7 +80,7 @@ static inline void __send_IPI_shortcut(unsigned int shortcut, int vector,
         /*
          * Send the IPI. The write to APIC_ICR fires this off.
          */
-        apic_write(APIC_ICR, cfg);
+        native_apic_mem_write(APIC_ICR, cfg);
 }
 
 /*
@@ -92,13 +98,13 @@ static inline void __send_IPI_dest_field(unsigned int mask, int vector,
         if (unlikely(vector == NMI_VECTOR))
                 safe_apic_wait_icr_idle();
         else
-                apic_wait_icr_idle();
+                __xapic_wait_icr_idle();
 
         /*
          * prepare target chip field
          */
         cfg = __prepare_ICR2(mask);
-        apic_write(APIC_ICR2, cfg);
+        native_apic_mem_write(APIC_ICR2, cfg);
 
         /*
          * program the ICR
@@ -108,7 +114,7 @@ static inline void __send_IPI_dest_field(unsigned int mask, int vector,
         /*
          * Send the IPI. The write to APIC_ICR fires this off.
          */
-        apic_write(APIC_ICR, cfg);
+        native_apic_mem_write(APIC_ICR, cfg);
 }
 
 static inline void send_IPI_mask_sequence(cpumask_t mask, int vector)
diff --git a/include/asm-x86/irq_remapping.h b/include/asm-x86/irq_remapping.h
new file mode 100644
index 000000000000..78242c6ffa58
--- /dev/null
+++ b/include/asm-x86/irq_remapping.h
@@ -0,0 +1,8 @@
+#ifndef _ASM_IRQ_REMAPPING_H
+#define _ASM_IRQ_REMAPPING_H
+
+extern int x2apic;
+
+#define IRTE_DEST(dest) ((x2apic) ? dest : dest << 8)
+
+#endif
diff --git a/include/asm-x86/mach-bigsmp/mach_apicdef.h b/include/asm-x86/mach-bigsmp/mach_apicdef.h
deleted file mode 100644
index 811935d9d49b..000000000000
--- a/include/asm-x86/mach-bigsmp/mach_apicdef.h
+++ /dev/null
@@ -1,13 +0,0 @@
-#ifndef ASM_X86__MACH_BIGSMP__MACH_APICDEF_H
-#define ASM_X86__MACH_BIGSMP__MACH_APICDEF_H
-
-#define         APIC_ID_MASK            (0xFF<<24)
-
-static inline unsigned get_apic_id(unsigned long x) 
-{ 
-        return (((x)>>24)&0xFF);
-} 
-
-#define         GET_APIC_ID(x)  get_apic_id(x)
-
-#endif /* ASM_X86__MACH_BIGSMP__MACH_APICDEF_H */
diff --git a/include/asm-x86/mach-default/mach_apic.h b/include/asm-x86/mach-default/mach_apic.h
index b615f40736be..2a330a41b3dd 100644
--- a/include/asm-x86/mach-default/mach_apic.h
+++ b/include/asm-x86/mach-default/mach_apic.h
@@ -30,6 +30,8 @@ static inline cpumask_t target_cpus(void)
 #define cpu_mask_to_apicid (genapic->cpu_mask_to_apicid)
 #define phys_pkg_id     (genapic->phys_pkg_id)
 #define vector_allocation_domain    (genapic->vector_allocation_domain)
+#define read_apic_id()  (GET_APIC_ID(apic_read(APIC_ID)))
+#define send_IPI_self (genapic->send_IPI_self)
 extern void setup_apic_routing(void);
 #else
 #define INT_DELIVERY_MODE dest_LowestPrio
@@ -54,7 +56,7 @@ static inline void init_apic_ldr(void)
 
 static inline int apic_id_registered(void)
 {
-        return physid_isset(GET_APIC_ID(read_apic_id()), phys_cpu_present_map);
+        return physid_isset(read_apic_id(), phys_cpu_present_map);
 }
 
 static inline unsigned int cpu_mask_to_apicid(cpumask_t cpumask)
diff --git a/include/asm-x86/mach-default/mach_apicdef.h b/include/asm-x86/mach-default/mach_apicdef.h
index 936704f816d6..0c2d41c41b20 100644
--- a/include/asm-x86/mach-default/mach_apicdef.h
+++ b/include/asm-x86/mach-default/mach_apicdef.h
@@ -4,9 +4,9 @@
 #include <asm/apic.h>
 
 #ifdef CONFIG_X86_64
-#define APIC_ID_MASK            (0xFFu<<24)
-#define GET_APIC_ID(x)          (((x)>>24)&0xFFu)
-#define SET_APIC_ID(x)          (((x)<<24))
+#define APIC_ID_MASK            (genapic->apic_id_mask)
+#define GET_APIC_ID(x)          (genapic->get_apic_id(x))
+#define SET_APIC_ID(x)          (genapic->set_apic_id(x))
 #else
 #define         APIC_ID_MASK            (0xF<<24)
 static inline unsigned get_apic_id(unsigned long x) 
diff --git a/include/asm-x86/mach-es7000/mach_apicdef.h b/include/asm-x86/mach-es7000/mach_apicdef.h
deleted file mode 100644
index a07e56744028..000000000000
--- a/include/asm-x86/mach-es7000/mach_apicdef.h
+++ /dev/null
@@ -1,13 +0,0 @@
-#ifndef ASM_X86__MACH_ES7000__MACH_APICDEF_H
-#define ASM_X86__MACH_ES7000__MACH_APICDEF_H
-
-#define         APIC_ID_MASK            (0xFF<<24)
-
-static inline unsigned get_apic_id(unsigned long x) 
-{ 
-        return (((x)>>24)&0xFF);
-} 
-
-#define         GET_APIC_ID(x)  get_apic_id(x)
-
-#endif /* ASM_X86__MACH_ES7000__MACH_APICDEF_H */
diff --git a/include/asm-x86/mach-numaq/mach_mpparse.h b/include/asm-x86/mach-numaq/mach_mpparse.h
deleted file mode 100644
index 74ade184920b..000000000000
--- a/include/asm-x86/mach-numaq/mach_mpparse.h
+++ /dev/null
@@ -1,7 +0,0 @@
-#ifndef ASM_X86__MACH_NUMAQ__MACH_MPPARSE_H
-#define ASM_X86__MACH_NUMAQ__MACH_MPPARSE_H
-
-extern void numaq_mps_oem_check(struct mp_config_table *mpc, char *oem,
-                                char *productid);
-
-#endif /* ASM_X86__MACH_NUMAQ__MACH_MPPARSE_H */
diff --git a/include/asm-x86/mach-summit/mach_apicdef.h b/include/asm-x86/mach-summit/mach_apicdef.h
deleted file mode 100644
index d4bc8590c4f6..000000000000
--- a/include/asm-x86/mach-summit/mach_apicdef.h
+++ /dev/null
@@ -1,13 +0,0 @@
-#ifndef ASM_X86__MACH_SUMMIT__MACH_APICDEF_H
-#define ASM_X86__MACH_SUMMIT__MACH_APICDEF_H
-
-#define         APIC_ID_MASK            (0xFF<<24)
-
-static inline unsigned get_apic_id(unsigned long x) 
-{ 
-        return (((x)>>24)&0xFF);
-} 
-
-#define         GET_APIC_ID(x)  get_apic_id(x)
-
-#endif /* ASM_X86__MACH_SUMMIT__MACH_APICDEF_H */
diff --git a/include/asm-x86/mpspec.h b/include/asm-x86/mpspec.h
index 118da365e371..be2241a818f1 100644
--- a/include/asm-x86/mpspec.h
+++ b/include/asm-x86/mpspec.h
@@ -5,11 +5,12 @@
 
 #include <asm/mpspec_def.h>
 
+extern int apic_version[MAX_APICS];
+
 #ifdef CONFIG_X86_32
 #include <mach_mpspec.h>
 
 extern unsigned int def_to_bigsmp;
-extern int apic_version[MAX_APICS];
 extern u8 apicid_2_node[];
 extern int pic_mode;
 
diff --git a/include/asm-x86/msidef.h b/include/asm-x86/msidef.h
index 3139666a94fa..ed9190246876 100644
--- a/include/asm-x86/msidef.h
+++ b/include/asm-x86/msidef.h
@@ -48,4 +48,8 @@
 #define  MSI_ADDR_DEST_ID(dest)         (((dest) << MSI_ADDR_DEST_ID_SHIFT) & \
                                          MSI_ADDR_DEST_ID_MASK)
 
+#define MSI_ADDR_IR_EXT_INT             (1 << 4)
+#define MSI_ADDR_IR_SHV                 (1 << 3)
+#define MSI_ADDR_IR_INDEX1(index)       ((index & 0x8000) >> 13)
+#define MSI_ADDR_IR_INDEX2(index)       ((index & 0x7fff) << 5)
 #endif /* ASM_X86__MSIDEF_H */
diff --git a/include/asm-x86/mach-numaq/mach_apic.h b/include/asm-x86/numaq/apic.h
index 7a0d39edfcfa..a8344ba6ea15 100644
--- a/include/asm-x86/mach-numaq/mach_apic.h
+++ b/include/asm-x86/numaq/apic.h
@@ -1,5 +1,5 @@
-#ifndef ASM_X86__MACH_NUMAQ__MACH_APIC_H
-#define ASM_X86__MACH_NUMAQ__MACH_APIC_H
+#ifndef __ASM_NUMAQ_APIC_H
+#define __ASM_NUMAQ_APIC_H
 
 #include <asm/io.h>
 #include <linux/mmzone.h>
@@ -135,4 +135,4 @@ static inline u32 phys_pkg_id(u32 cpuid_apic, int index_msb)
         return cpuid_apic >> index_msb;
 }
 
-#endif /* ASM_X86__MACH_NUMAQ__MACH_APIC_H */
+#endif /* __ASM_NUMAQ_APIC_H */
diff --git a/include/asm-x86/mach-numaq/mach_apicdef.h b/include/asm-x86/numaq/apicdef.h
index f870ec5f7782..e012a46cc22a 100644
--- a/include/asm-x86/mach-numaq/mach_apicdef.h
+++ b/include/asm-x86/numaq/apicdef.h
@@ -1,5 +1,5 @@
-#ifndef ASM_X86__MACH_NUMAQ__MACH_APICDEF_H
-#define ASM_X86__MACH_NUMAQ__MACH_APICDEF_H
+#ifndef __ASM_NUMAQ_APICDEF_H
+#define __ASM_NUMAQ_APICDEF_H
 
 
 #define APIC_ID_MASK (0xF<<24)
@@ -11,4 +11,4 @@ static inline unsigned get_apic_id(unsigned long x)
 
 #define         GET_APIC_ID(x)  get_apic_id(x)
 
-#endif /* ASM_X86__MACH_NUMAQ__MACH_APICDEF_H */
+#endif
diff --git a/include/asm-x86/mach-numaq/mach_ipi.h b/include/asm-x86/numaq/ipi.h
index 1e835823f4bc..935588d286cf 100644
--- a/include/asm-x86/mach-numaq/mach_ipi.h
+++ b/include/asm-x86/numaq/ipi.h
@@ -1,5 +1,5 @@
-#ifndef ASM_X86__MACH_NUMAQ__MACH_IPI_H
-#define ASM_X86__MACH_NUMAQ__MACH_IPI_H
+#ifndef __ASM_NUMAQ_IPI_H
+#define __ASM_NUMAQ_IPI_H
 
 void send_IPI_mask_sequence(cpumask_t, int vector);
 
@@ -22,4 +22,4 @@ static inline void send_IPI_all(int vector)
         send_IPI_mask(cpu_online_map, vector);
 }
 
-#endif /* ASM_X86__MACH_NUMAQ__MACH_IPI_H */
+#endif /* __ASM_NUMAQ_IPI_H */
diff --git a/include/asm-x86/numaq/mpparse.h b/include/asm-x86/numaq/mpparse.h
new file mode 100644
index 000000000000..252292e077b6
--- /dev/null
+++ b/include/asm-x86/numaq/mpparse.h
@@ -0,0 +1,7 @@
+#ifndef __ASM_NUMAQ_MPPARSE_H
+#define __ASM_NUMAQ_MPPARSE_H
+
+extern void numaq_mps_oem_check(struct mp_config_table *mpc, char *oem,
+                                char *productid);
+
+#endif /* __ASM_NUMAQ_MPPARSE_H */
diff --git a/include/asm-x86/mach-numaq/mach_wakecpu.h b/include/asm-x86/numaq/wakecpu.h
index 0db8cea643c0..c577bda5b1c5 100644
--- a/include/asm-x86/mach-numaq/mach_wakecpu.h
+++ b/include/asm-x86/numaq/wakecpu.h
@@ -1,5 +1,5 @@
-#ifndef ASM_X86__MACH_NUMAQ__MACH_WAKECPU_H
-#define ASM_X86__MACH_NUMAQ__MACH_WAKECPU_H
+#ifndef __ASM_NUMAQ_WAKECPU_H
+#define __ASM_NUMAQ_WAKECPU_H
 
 /* This file copes with machines that wakeup secondary CPUs by NMIs */
 
@@ -40,4 +40,4 @@ static inline void restore_NMI_vector(unsigned short *high, unsigned short *low)
 
 #define inquire_remote_apic(apicid) {}
 
-#endif /* ASM_X86__MACH_NUMAQ__MACH_WAKECPU_H */
+#endif /* __ASM_NUMAQ_WAKECPU_H */
diff --git a/include/asm-x86/paravirt.h b/include/asm-x86/paravirt.h
index 891971f57d35..d7d358a43996 100644
--- a/include/asm-x86/paravirt.h
+++ b/include/asm-x86/paravirt.h
@@ -201,12 +201,6 @@ struct pv_irq_ops {
 
 struct pv_apic_ops {
 #ifdef CONFIG_X86_LOCAL_APIC
-        /*
-         * Direct APIC operations, principally for VMI.  Ideally
-         * these shouldn't be in this interface.
-         */
-        void (*apic_write)(unsigned long reg, u32 v);
-        u32 (*apic_read)(unsigned long reg);
         void (*setup_boot_clock)(void);
         void (*setup_secondary_clock)(void);
 
@@ -910,19 +904,6 @@ static inline void slow_down_io(void)
 }
 
 #ifdef CONFIG_X86_LOCAL_APIC
-/*
- * Basic functions accessing APICs.
- */
-static inline void apic_write(unsigned long reg, u32 v)
-{
-        PVOP_VCALL2(pv_apic_ops.apic_write, reg, v);
-}
-
-static inline u32 apic_read(unsigned long reg)
-{
-        return PVOP_CALL1(unsigned long, pv_apic_ops.apic_read, reg);
-}
-
 static inline void setup_boot_clock(void)
 {
         PVOP_VCALL0(pv_apic_ops.setup_boot_clock);
diff --git a/include/asm-x86/setup.h b/include/asm-x86/setup.h
index 9030cb73c4d7..11b6cc14b289 100644
--- a/include/asm-x86/setup.h
+++ b/include/asm-x86/setup.h
@@ -38,6 +38,7 @@ struct x86_quirks {
         void (*mpc_oem_pci_bus)(struct mpc_config_bus *m);
         void (*smp_read_mpc_oem)(struct mp_config_oemtable *oemtable,
                                     unsigned short oemsize);
+        int (*setup_ioapic_ids)(void);
 };
 
 extern struct x86_quirks *x86_quirks;
diff --git a/include/asm-x86/smp.h b/include/asm-x86/smp.h
index 04f84f4e2c8b..29324c103341 100644
--- a/include/asm-x86/smp.h
+++ b/include/asm-x86/smp.h
@@ -167,30 +167,33 @@ extern int safe_smp_processor_id(void);
 
 #ifdef CONFIG_X86_LOCAL_APIC
 
+#ifndef CONFIG_X86_64
 static inline int logical_smp_processor_id(void)
 {
         /* we don't want to mark this access volatile - bad code generation */
         return GET_APIC_LOGICAL_ID(*(u32 *)(APIC_BASE + APIC_LDR));
 }
 
-#ifndef CONFIG_X86_64
+#include <mach_apicdef.h>
 static inline unsigned int read_apic_id(void)
 {
-        return *(u32 *)(APIC_BASE + APIC_ID);
+        unsigned int reg;
+
+        reg = *(u32 *)(APIC_BASE + APIC_ID);
+
+        return GET_APIC_ID(reg);
 }
-#else
-extern unsigned int read_apic_id(void);
 #endif
 
 
-# ifdef APIC_DEFINITION
+# if defined(APIC_DEFINITION) || defined(CONFIG_X86_64)
 extern int hard_smp_processor_id(void);
 # else
-#  include <mach_apicdef.h>
+#include <mach_apicdef.h>
 static inline int hard_smp_processor_id(void)
 {
         /* we don't want to mark this access volatile - bad code generation */
-        return GET_APIC_ID(read_apic_id());
+        return read_apic_id();
 }
 # endif /* APIC_DEFINITION */
 
diff --git a/include/asm-x86/mach-summit/mach_apic.h b/include/asm-x86/summit/apic.h
index 7a66758d701d..c5b2e4b10358 100644
--- a/include/asm-x86/mach-summit/mach_apic.h
+++ b/include/asm-x86/summit/apic.h
@@ -1,5 +1,5 @@
-#ifndef ASM_X86__MACH_SUMMIT__MACH_APIC_H
-#define ASM_X86__MACH_SUMMIT__MACH_APIC_H
+#ifndef __ASM_SUMMIT_APIC_H
+#define __ASM_SUMMIT_APIC_H
 
 #include <asm/smp.h>
 
@@ -21,7 +21,7 @@ static inline cpumask_t target_cpus(void)
          * Just start on cpu 0.  IRQ balancing will spread load
          */
         return cpumask_of_cpu(0);
-} 
+}
 #define TARGET_CPUS     (target_cpus())
 
 #define INT_DELIVERY_MODE (dest_LowestPrio)
@@ -30,10 +30,10 @@ static inline cpumask_t target_cpus(void)
 static inline unsigned long check_apicid_used(physid_mask_t bitmap, int apicid)
 {
         return 0;
-} 
+}
 
 /* we don't use the phys_cpu_present_map to indicate apicid presence */
-static inline unsigned long check_apicid_present(int bit) 
+static inline unsigned long check_apicid_present(int bit)
 {
         return 1;
 }
@@ -122,7 +122,7 @@ static inline physid_mask_t ioapic_phys_id_map(physid_mask_t phys_id_map)
 
 static inline physid_mask_t apicid_to_cpu_present(int apicid)
 {
-        return physid_mask_of_physid(apicid);
+        return physid_mask_of_physid(0);
 }
 
 static inline void setup_portio_remap(void)
@@ -143,22 +143,22 @@ static inline unsigned int cpu_mask_to_apicid(cpumask_t cpumask)
         int num_bits_set;
         int cpus_found = 0;
         int cpu;
-        int apicid;     
+        int apicid;
 
         num_bits_set = cpus_weight(cpumask);
         /* Return id to all */
         if (num_bits_set == NR_CPUS)
                 return (int) 0xFF;
-        /* 
-         * The cpus in the mask must all be on the apic cluster.  If are not 
-         * on the same apicid cluster return default value of TARGET_CPUS. 
+        /*
+         * The cpus in the mask must all be on the apic cluster.  If are not
+         * on the same apicid cluster return default value of TARGET_CPUS.
          */
         cpu = first_cpu(cpumask);
         apicid = cpu_to_logical_apicid(cpu);
         while (cpus_found < num_bits_set) {
                 if (cpu_isset(cpu, cpumask)) {
                         int new_apicid = cpu_to_logical_apicid(cpu);
-                        if (apicid_cluster(apicid) != 
+                        if (apicid_cluster(apicid) !=
                                         apicid_cluster(new_apicid)){
                                 printk ("%s: Not a valid mask!\n",__FUNCTION__);
                                 return 0xFF;
@@ -182,4 +182,4 @@ static inline u32 phys_pkg_id(u32 cpuid_apic, int index_msb)
         return hard_smp_processor_id() >> index_msb;
 }
 
-#endif /* ASM_X86__MACH_SUMMIT__MACH_APIC_H */
+#endif /* __ASM_SUMMIT_APIC_H */
diff --git a/include/asm-x86/summit/apicdef.h b/include/asm-x86/summit/apicdef.h
new file mode 100644
index 000000000000..f3fbca1f61c1
--- /dev/null
+++ b/include/asm-x86/summit/apicdef.h
@@ -0,0 +1,13 @@
+#ifndef __ASM_SUMMIT_APICDEF_H
+#define __ASM_SUMMIT_APICDEF_H
+
+#define         APIC_ID_MASK            (0xFF<<24)
+
+static inline unsigned get_apic_id(unsigned long x)
+{
+        return (x>>24)&0xFF;
+}
+
+#define         GET_APIC_ID(x)  get_apic_id(x)
+
+#endif
diff --git a/include/asm-x86/mach-summit/mach_ipi.h b/include/asm-x86/summit/ipi.h
index a3b31c528d90..53bd1e7bd7b4 100644
--- a/include/asm-x86/mach-summit/mach_ipi.h
+++ b/include/asm-x86/summit/ipi.h
@@ -1,5 +1,5 @@
-#ifndef ASM_X86__MACH_SUMMIT__MACH_IPI_H
-#define ASM_X86__MACH_SUMMIT__MACH_IPI_H
+#ifndef __ASM_SUMMIT_IPI_H
+#define __ASM_SUMMIT_IPI_H
 
 void send_IPI_mask_sequence(cpumask_t mask, int vector);
 
@@ -22,4 +22,4 @@ static inline void send_IPI_all(int vector)
         send_IPI_mask(cpu_online_map, vector);
 }
 
-#endif /* ASM_X86__MACH_SUMMIT__MACH_IPI_H */
+#endif /* __ASM_SUMMIT_IPI_H */
diff --git a/include/asm-x86/mach-summit/irq_vectors_limits.h b/include/asm-x86/summit/irq_vectors_limits.h
index 22f376ad68e1..890ce3f5e09a 100644
--- a/include/asm-x86/mach-summit/irq_vectors_limits.h
+++ b/include/asm-x86/summit/irq_vectors_limits.h
@@ -1,5 +1,5 @@
-#ifndef ASM_X86__MACH_SUMMIT__IRQ_VECTORS_LIMITS_H
-#define ASM_X86__MACH_SUMMIT__IRQ_VECTORS_LIMITS_H
+#ifndef _ASM_IRQ_VECTORS_LIMITS_H
+#define _ASM_IRQ_VECTORS_LIMITS_H
 
 /*
  * For Summit or generic (i.e. installer) kernels, we have lots of I/O APICs,
@@ -11,4 +11,4 @@
 #define NR_IRQS 224
 #define NR_IRQ_VECTORS  1024
 
-#endif /* ASM_X86__MACH_SUMMIT__IRQ_VECTORS_LIMITS_H */
+#endif /* _ASM_IRQ_VECTORS_LIMITS_H */
diff --git a/include/asm-x86/mach-summit/mach_mpparse.h b/include/asm-x86/summit/mpparse.h
index 92396f28772b..013ce6fab2d5 100644
--- a/include/asm-x86/mach-summit/mach_mpparse.h
+++ b/include/asm-x86/summit/mpparse.h
@@ -1,7 +1,6 @@
-#ifndef ASM_X86__MACH_SUMMIT__MACH_MPPARSE_H
-#define ASM_X86__MACH_SUMMIT__MACH_MPPARSE_H
+#ifndef __ASM_SUMMIT_MPPARSE_H
+#define __ASM_SUMMIT_MPPARSE_H
 
-#include <mach_apic.h>
 #include <asm/tsc.h>
 
 extern int use_cyclone;
@@ -12,11 +11,11 @@ extern void setup_summit(void);
 #define setup_summit()  {}
 #endif
 
-static inline int mps_oem_check(struct mp_config_table *mpc, char *oem, 
+static inline int mps_oem_check(struct mp_config_table *mpc, char *oem,
                 char *productid)
 {
-        if (!strncmp(oem, "IBM ENSW", 8) && 
-                        (!strncmp(productid, "VIGIL SMP", 9) 
+        if (!strncmp(oem, "IBM ENSW", 8) &&
+                        (!strncmp(productid, "VIGIL SMP", 9)
                          || !strncmp(productid, "EXA", 3)
                          || !strncmp(productid, "RUTHLESS SMP", 12))){
                 mark_tsc_unstable("Summit based system");
@@ -107,4 +106,4 @@ static inline int is_WPEG(struct rio_detail *rio){
                 rio->type == LookOutAWPEG || rio->type == LookOutBWPEG);
 }
 
-#endif /* ASM_X86__MACH_SUMMIT__MACH_MPPARSE_H */
+#endif /* __ASM_SUMMIT_MPPARSE_H */
diff --git a/include/linux/dmar.h b/include/linux/dmar.h
index 56c73b847551..c360c558e59e 100644
--- a/include/linux/dmar.h
+++ b/include/linux/dmar.h
@@ -25,9 +25,99 @@
 #include <linux/types.h>
 #include <linux/msi.h>
 
-#ifdef CONFIG_DMAR
+#if defined(CONFIG_DMAR) || defined(CONFIG_INTR_REMAP)
 struct intel_iommu;
 
+struct dmar_drhd_unit {
+        struct list_head list;          /* list of drhd units   */
+        struct  acpi_dmar_header *hdr;  /* ACPI header          */
+        u64     reg_base_addr;          /* register base address*/
+        struct  pci_dev **devices;      /* target device array  */
+        int     devices_cnt;            /* target device count  */
+        u8      ignored:1;              /* ignore drhd          */
+        u8      include_all:1;
+        struct intel_iommu *iommu;
+};
+
+extern struct list_head dmar_drhd_units;
+
+#define for_each_drhd_unit(drhd) \
+        list_for_each_entry(drhd, &dmar_drhd_units, list)
+
+extern int dmar_table_init(void);
+extern int early_dmar_detect(void);
+extern int dmar_dev_scope_init(void);
+
+/* Intel IOMMU detection */
+extern void detect_intel_iommu(void);
+
+
+extern int parse_ioapics_under_ir(void);
+extern int alloc_iommu(struct dmar_drhd_unit *);
+#else
+static inline void detect_intel_iommu(void)
+{
+        return;
+}
+
+static inline int dmar_table_init(void)
+{
+        return -ENODEV;
+}
+#endif /* !CONFIG_DMAR && !CONFIG_INTR_REMAP */
+
+#ifdef CONFIG_INTR_REMAP
+extern int intr_remapping_enabled;
+extern int enable_intr_remapping(int);
+
+struct irte {
+        union {
+                struct {
+                        __u64   present         : 1,
+                                fpd             : 1,
+                                dst_mode        : 1,
+                                redir_hint      : 1,
+                                trigger_mode    : 1,
+                                dlvry_mode      : 3,
+                                avail           : 4,
+                                __reserved_1    : 4,
+                                vector          : 8,
+                                __reserved_2    : 8,
+                                dest_id         : 32;
+                };
+                __u64 low;
+        };
+
+        union {
+                struct {
+                        __u64   sid             : 16,
+                                sq              : 2,
+                                svt             : 2,
+                                __reserved_3    : 44;
+                };
+                __u64 high;
+        };
+};
+extern int get_irte(int irq, struct irte *entry);
+extern int modify_irte(int irq, struct irte *irte_modified);
+extern int alloc_irte(struct intel_iommu *iommu, int irq, u16 count);
+extern int set_irte_irq(int irq, struct intel_iommu *iommu, u16 index,
+                        u16 sub_handle);
+extern int map_irq_to_irte_handle(int irq, u16 *sub_handle);
+extern int clear_irte_irq(int irq, struct intel_iommu *iommu, u16 index);
+extern int flush_irte(int irq);
+extern int free_irte(int irq);
+
+extern int irq_remapped(int irq);
+extern struct intel_iommu *map_dev_to_ir(struct pci_dev *dev);
+extern struct intel_iommu *map_ioapic_to_ir(int apic);
+#else
+#define irq_remapped(irq)               (0)
+#define enable_intr_remapping(mode)     (-1)
+#define intr_remapping_enabled          (0)
+#endif
+
+#ifdef CONFIG_DMAR
 extern const char *dmar_get_fault_reason(u8 fault_reason);
 
 /* Can't use the common MSI interrupt functions
@@ -40,47 +130,30 @@ extern void dmar_msi_write(int irq, struct msi_msg *msg);
 extern int dmar_set_interrupt(struct intel_iommu *iommu);
 extern int arch_setup_dmar_msi(unsigned int irq);
 
-/* Intel IOMMU detection and initialization functions */
-extern void detect_intel_iommu(void);
-extern int intel_iommu_init(void);
-
-extern int dmar_table_init(void);
-extern int early_dmar_detect(void);
-
-extern struct list_head dmar_drhd_units;
+extern int iommu_detected, no_iommu;
 extern struct list_head dmar_rmrr_units;
-
-struct dmar_drhd_unit {
-        struct list_head list;          /* list of drhd units   */
-        u64     reg_base_addr;          /* register base address*/
-        struct  pci_dev **devices;      /* target device array  */
-        int     devices_cnt;            /* target device count  */
-        u8      ignored:1;              /* ignore drhd          */
-        u8      include_all:1;
-        struct intel_iommu *iommu;
-};
-
 struct dmar_rmrr_unit {
         struct list_head list;          /* list of rmrr units   */
+        struct acpi_dmar_header *hdr;   /* ACPI header          */
         u64     base_address;           /* reserved base address*/
         u64     end_address;            /* reserved end address */
         struct pci_dev **devices;       /* target devices */
         int     devices_cnt;            /* target device count */
 };
 
-#define for_each_drhd_unit(drhd) \
-        list_for_each_entry(drhd, &dmar_drhd_units, list)
 #define for_each_rmrr_units(rmrr) \
         list_for_each_entry(rmrr, &dmar_rmrr_units, list)
+/* Intel DMAR  initialization functions */
+extern int intel_iommu_init(void);
+extern int dmar_disabled;
 #else
-static inline void detect_intel_iommu(void)
-{
-        return;
-}
 static inline int intel_iommu_init(void)
 {
+#ifdef CONFIG_INTR_REMAP
+        return dmar_dev_scope_init();
+#else
         return -ENODEV;
+#endif
 }
-
 #endif /* !CONFIG_DMAR */
 #endif /* __DMAR_H__ */
diff --git a/include/linux/irq.h b/include/linux/irq.h
index 8ccb462ea42c..8d9411bc60f6 100644
--- a/include/linux/irq.h
+++ b/include/linux/irq.h
@@ -62,6 +62,7 @@ typedef	void (*irq_flow_handler_t)(unsigned int irq,
 #define IRQ_MOVE_PENDING        0x00200000      /* need to re-target IRQ destination */
 #define IRQ_NO_BALANCING        0x00400000      /* IRQ is excluded from balancing */
 #define IRQ_SPURIOUS_DISABLED   0x00800000      /* IRQ was disabled by the spurious trap */
+#define IRQ_MOVE_PCNTXT 0x01000000      /* IRQ migration from process context */
 
 #ifdef CONFIG_IRQ_PER_CPU
 # define CHECK_IRQ_PER_CPU(var) ((var) & IRQ_PER_CPU)
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index 0314074fa232..60c49e324390 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -89,7 +89,14 @@ int irq_set_affinity(unsigned int irq, cpumask_t cpumask)
         set_balance_irq_affinity(irq, cpumask);
 
 #ifdef CONFIG_GENERIC_PENDING_IRQ
-        set_pending_irq(irq, cpumask);
+        if (desc->status & IRQ_MOVE_PCNTXT) {
+                unsigned long flags;
+
+                spin_lock_irqsave(&desc->lock, flags);
+                desc->chip->set_affinity(irq, cpumask);
+                spin_unlock_irqrestore(&desc->lock, flags);
+        } else
+                set_pending_irq(irq, cpumask);
 #else
         desc->affinity = cpumask;
         desc->chip->set_affinity(irq, cpumask);