Update from upstream with manual merge of Yasunori Goto's

changes to swiotlb.c made in commit 281dd25cdc0d6903929b79183816d151ea626341
since this file has been moved from arch/ia64/lib/swiotlb.c to
lib/swiotlb.c

Signed-off-by: Tony Luck <tony.luck@intel.com>

11 files changed, 195 insertions, 48 deletions

diff --git a/arch/x86_64/kernel/e820.c b/arch/x86_64/kernel/e820.c
index 4e34b0f9d613..ab3f87aaff70 100644
--- a/arch/x86_64/kernel/e820.c
+++ b/arch/x86_64/kernel/e820.c
@@ -17,6 +17,8 @@
 #include <linux/ioport.h>
 #include <linux/string.h>
 #include <linux/kexec.h>
+#include <linux/module.h>
+
 #include <asm/page.h>
 #include <asm/e820.h>
 #include <asm/proto.h>
diff --git a/arch/x86_64/kernel/head.S b/arch/x86_64/kernel/head.S
index 4592bf21fcaf..b92e5f45ed46 100644
--- a/arch/x86_64/kernel/head.S
+++ b/arch/x86_64/kernel/head.S
@@ -270,26 +270,26 @@ ENTRY(level3_kernel_pgt)
 .org 0x4000
 ENTRY(level2_ident_pgt)
         /* 40MB for bootup.     */
-        .quad   0x0000000000000183
-        .quad   0x0000000000200183
-        .quad   0x0000000000400183
-        .quad   0x0000000000600183
-        .quad   0x0000000000800183
-        .quad   0x0000000000A00183
-        .quad   0x0000000000C00183
-        .quad   0x0000000000E00183
-        .quad   0x0000000001000183
-        .quad   0x0000000001200183
-        .quad   0x0000000001400183
-        .quad   0x0000000001600183
-        .quad   0x0000000001800183
-        .quad   0x0000000001A00183
-        .quad   0x0000000001C00183
-        .quad   0x0000000001E00183
-        .quad   0x0000000002000183
-        .quad   0x0000000002200183
-        .quad   0x0000000002400183
-        .quad   0x0000000002600183
+        .quad   0x0000000000000083
+        .quad   0x0000000000200083
+        .quad   0x0000000000400083
+        .quad   0x0000000000600083
+        .quad   0x0000000000800083
+        .quad   0x0000000000A00083
+        .quad   0x0000000000C00083
+        .quad   0x0000000000E00083
+        .quad   0x0000000001000083
+        .quad   0x0000000001200083
+        .quad   0x0000000001400083
+        .quad   0x0000000001600083
+        .quad   0x0000000001800083
+        .quad   0x0000000001A00083
+        .quad   0x0000000001C00083
+        .quad   0x0000000001E00083
+        .quad   0x0000000002000083
+        .quad   0x0000000002200083
+        .quad   0x0000000002400083
+        .quad   0x0000000002600083
         /* Temporary mappings for the super early allocator in arch/x86_64/mm/init.c */
         .globl temp_boot_pmds
 temp_boot_pmds:
diff --git a/arch/x86_64/kernel/kprobes.c b/arch/x86_64/kernel/kprobes.c
index df08c43276a0..76a28b007be9 100644
--- a/arch/x86_64/kernel/kprobes.c
+++ b/arch/x86_64/kernel/kprobes.c
@@ -77,9 +77,9 @@ static inline int is_IF_modifier(kprobe_opcode_t *insn)
 int __kprobes arch_prepare_kprobe(struct kprobe *p)
 {
         /* insn: must be on special executable page on x86_64. */
-        up(&kprobe_mutex);
-        p->ainsn.insn = get_insn_slot();
         down(&kprobe_mutex);
+        p->ainsn.insn = get_insn_slot();
+        up(&kprobe_mutex);
         if (!p->ainsn.insn) {
                 return -ENOMEM;
         }
@@ -231,9 +231,9 @@ void __kprobes arch_disarm_kprobe(struct kprobe *p)
 
 void __kprobes arch_remove_kprobe(struct kprobe *p)
 {
-        up(&kprobe_mutex);
-        free_insn_slot(p->ainsn.insn);
         down(&kprobe_mutex);
+        free_insn_slot(p->ainsn.insn);
+        up(&kprobe_mutex);
 }
 
 static inline void save_previous_kprobe(void)
diff --git a/arch/x86_64/kernel/mce.c b/arch/x86_64/kernel/mce.c
index 08203b07f4bd..69541db5ff2c 100644
--- a/arch/x86_64/kernel/mce.c
+++ b/arch/x86_64/kernel/mce.c
@@ -54,9 +54,12 @@ void mce_log(struct mce *mce)
 {
         unsigned next, entry;
         mce->finished = 0;
-        smp_wmb();
+        wmb();
         for (;;) {
                 entry = rcu_dereference(mcelog.next);
+                /* The rmb forces the compiler to reload next in each
+                    iteration */
+                rmb();
                 for (;;) {
                         /* When the buffer fills up discard new entries. Assume
                            that the earlier errors are the more interesting. */
@@ -69,6 +72,7 @@ void mce_log(struct mce *mce)
                                 entry++;
                                 continue;
                         }
+                        break;
                 }
                 smp_rmb();
                 next = entry + 1;
@@ -76,9 +80,9 @@ void mce_log(struct mce *mce)
                         break;
         }
         memcpy(mcelog.entry + entry, mce, sizeof(struct mce));
-        smp_wmb();
+        wmb();
         mcelog.entry[entry].finished = 1;
-        smp_wmb();
+        wmb();
 
         if (!test_and_set_bit(0, &console_logged))
                 notify_user = 1;
diff --git a/arch/x86_64/kernel/setup.c b/arch/x86_64/kernel/setup.c
index 351d8d64c2fb..cb28df14ff6f 100644
--- a/arch/x86_64/kernel/setup.c
+++ b/arch/x86_64/kernel/setup.c
@@ -836,6 +836,23 @@ static int __init init_amd(struct cpuinfo_x86 *c)
         int r;
         int level;
 
+#ifdef CONFIG_SMP
+        unsigned long value;
+
+        /*
+         * Disable TLB flush filter by setting HWCR.FFDIS on K8
+         * bit 6 of msr C001_0015
+         *
+         * Errata 63 for SH-B3 steppings
+         * Errata 122 for all steppings (F+ have it disabled by default)
+         */
+        if (c->x86 == 15) {
+                rdmsrl(MSR_K8_HWCR, value);
+                value |= 1 << 6;
+                wrmsrl(MSR_K8_HWCR, value);
+        }
+#endif
+
         /* Bit 31 in normal CPUID used for nonstandard 3DNow ID;
            3DNow is IDd by bit 31 in extended CPUID (1*32+31) anyway */
         clear_bit(0*32+31, &c->x86_capability);
@@ -950,13 +967,12 @@ static int __cpuinit intel_num_cpu_cores(struct cpuinfo_x86 *c)
 static void srat_detect_node(void)
 {
 #ifdef CONFIG_NUMA
-        unsigned apicid, node;
+        unsigned node;
         int cpu = smp_processor_id();
 
         /* Don't do the funky fallback heuristics the AMD version employs
            for now. */
-        apicid = phys_proc_id[cpu];
-        node = apicid_to_node[apicid];
+        node = apicid_to_node[hard_smp_processor_id()];
         if (node == NUMA_NO_NODE)
                 node = 0;
         cpu_to_node[cpu] = node;
diff --git a/arch/x86_64/kernel/setup64.c b/arch/x86_64/kernel/setup64.c
index bd33be24a386..79190891fbc5 100644
--- a/arch/x86_64/kernel/setup64.c
+++ b/arch/x86_64/kernel/setup64.c
@@ -87,6 +87,10 @@ void __init setup_per_cpu_areas(void)
         int i;
         unsigned long size;
 
+#ifdef CONFIG_HOTPLUG_CPU
+        prefill_possible_map();
+#endif
+
         /* Copy section for each CPU (we discard the original) */
         size = ALIGN(__per_cpu_end - __per_cpu_start, SMP_CACHE_BYTES);
 #ifdef CONFIG_MODULES
diff --git a/arch/x86_64/kernel/smpboot.c b/arch/x86_64/kernel/smpboot.c
index e12d7baeb33e..658a81b33f3b 100644
--- a/arch/x86_64/kernel/smpboot.c
+++ b/arch/x86_64/kernel/smpboot.c
@@ -892,7 +892,7 @@ static __init void disable_smp(void)
  * those NR_CPUS, hence cpu_possible_map represents entire NR_CPUS range.
  * - Ashok Raj
  */
-static void prefill_possible_map(void)
+__init void prefill_possible_map(void)
 {
         int i;
         for (i = 0; i < NR_CPUS; i++)
@@ -967,10 +967,6 @@ void __init smp_prepare_cpus(unsigned int max_cpus)
         current_cpu_data = boot_cpu_data;
         current_thread_info()->cpu = 0;  /* needed? */
 
-#ifdef CONFIG_HOTPLUG_CPU
-        prefill_possible_map();
-#endif
-
         if (smp_sanity_check(max_cpus) < 0) {
                 printk(KERN_INFO "SMP disabled\n");
                 disable_smp();
diff --git a/arch/x86_64/kernel/suspend.c b/arch/x86_64/kernel/suspend.c
index ebb9abf3ce6d..f066c6ab3618 100644
--- a/arch/x86_64/kernel/suspend.c
+++ b/arch/x86_64/kernel/suspend.c
@@ -11,6 +11,8 @@
 #include <linux/smp.h>
 #include <linux/suspend.h>
 #include <asm/proto.h>
+#include <asm/page.h>
+#include <asm/pgtable.h>
 
 struct saved_context saved_context;
 
@@ -140,4 +142,129 @@ void fix_processor_context(void)
 
 }
 
+#ifdef CONFIG_SOFTWARE_SUSPEND
+/* Defined in arch/x86_64/kernel/suspend_asm.S */
+extern int restore_image(void);
 
+pgd_t *temp_level4_pgt;
+
+static void **pages;
+
+static inline void *__add_page(void)
+{
+        void **c;
+
+        c = (void **)get_usable_page(GFP_ATOMIC);
+        if (c) {
+                *c = pages;
+                pages = c;
+        }
+        return c;
+}
+
+static inline void *__next_page(void)
+{
+        void **c;
+
+        c = pages;
+        if (c) {
+                pages = *c;
+                *c = NULL;
+        }
+        return c;
+}
+
+/*
+ * Try to allocate as many usable pages as needed and daisy chain them.
+ * If one allocation fails, free the pages allocated so far
+ */
+static int alloc_usable_pages(unsigned long n)
+{
+        void *p;
+
+        pages = NULL;
+        do
+                if (!__add_page())
+                        break;
+        while (--n);
+        if (n) {
+                p = __next_page();
+                while (p) {
+                        free_page((unsigned long)p);
+                        p = __next_page();
+                }
+                return -ENOMEM;
+        }
+        return 0;
+}
+
+static void res_phys_pud_init(pud_t *pud, unsigned long address, unsigned long end)
+{
+        long i, j;
+
+        i = pud_index(address);
+        pud = pud + i;
+        for (; i < PTRS_PER_PUD; pud++, i++) {
+                unsigned long paddr;
+                pmd_t *pmd;
+
+                paddr = address + i*PUD_SIZE;
+                if (paddr >= end)
+                        break;
+
+                pmd = (pmd_t *)__next_page();
+                set_pud(pud, __pud(__pa(pmd) | _KERNPG_TABLE));
+                for (j = 0; j < PTRS_PER_PMD; pmd++, j++, paddr += PMD_SIZE) {
+                        unsigned long pe;
+
+                        if (paddr >= end)
+                                break;
+                        pe = _PAGE_NX | _PAGE_PSE | _KERNPG_TABLE | paddr;
+                        pe &= __supported_pte_mask;
+                        set_pmd(pmd, __pmd(pe));
+                }
+        }
+}
+
+static void set_up_temporary_mappings(void)
+{
+        unsigned long start, end, next;
+
+        temp_level4_pgt = (pgd_t *)__next_page();
+
+        /* It is safe to reuse the original kernel mapping */
+        set_pgd(temp_level4_pgt + pgd_index(__START_KERNEL_map),
+                init_level4_pgt[pgd_index(__START_KERNEL_map)]);
+
+        /* Set up the direct mapping from scratch */
+        start = (unsigned long)pfn_to_kaddr(0);
+        end = (unsigned long)pfn_to_kaddr(end_pfn);
+
+        for (; start < end; start = next) {
+                pud_t *pud = (pud_t *)__next_page();
+                next = start + PGDIR_SIZE;
+                if (next > end)
+                        next = end;
+                res_phys_pud_init(pud, __pa(start), __pa(next));
+                set_pgd(temp_level4_pgt + pgd_index(start),
+                        mk_kernel_pgd(__pa(pud)));
+        }
+}
+
+int swsusp_arch_resume(void)
+{
+        unsigned long n;
+
+        n = ((end_pfn << PAGE_SHIFT) + PUD_SIZE - 1) >> PUD_SHIFT;
+        n += (n + PTRS_PER_PUD - 1) / PTRS_PER_PUD + 1;
+        pr_debug("swsusp_arch_resume(): pages needed = %lu\n", n);
+        if (alloc_usable_pages(n)) {
+                free_eaten_memory();
+                return -ENOMEM;
+        }
+        /* We have got enough memory and from now on we cannot recover */
+        set_up_temporary_mappings();
+        restore_image();
+        return 0;
+}
+#endif /* CONFIG_SOFTWARE_SUSPEND */
diff --git a/arch/x86_64/kernel/suspend_asm.S b/arch/x86_64/kernel/suspend_asm.S
index 4d659e97df10..320b6fb00cca 100644
--- a/arch/x86_64/kernel/suspend_asm.S
+++ b/arch/x86_64/kernel/suspend_asm.S
@@ -39,12 +39,13 @@ ENTRY(swsusp_arch_suspend)
         call swsusp_save
         ret
 
-ENTRY(swsusp_arch_resume)
-        /* set up cr3 */        
-        leaq    init_level4_pgt(%rip),%rax
-        subq    $__START_KERNEL_map,%rax
-        movq    %rax,%cr3
-
+ENTRY(restore_image)
+        /* switch to temporary page tables */
+        movq    $__PAGE_OFFSET, %rdx
+        movq    temp_level4_pgt(%rip), %rax
+        subq    %rdx, %rax
+        movq    %rax, %cr3
+        /* Flush TLB */
         movq    mmu_cr4_features(%rip), %rax
         movq    %rax, %rdx
         andq    $~(1<<7), %rdx  # PGE
@@ -69,6 +70,10 @@ loop:
         movq    pbe_next(%rdx), %rdx
         jmp     loop
 done:
+        /* go back to the original page tables */
+        leaq    init_level4_pgt(%rip), %rax
+        subq    $__START_KERNEL_map, %rax
+        movq    %rax, %cr3
         /* Flush TLB, including "global" things (vmalloc) */
         movq    mmu_cr4_features(%rip), %rax
         movq    %rax, %rdx
diff --git a/arch/x86_64/kernel/time.c b/arch/x86_64/kernel/time.c
index 2373cb8b8625..703acde2a1a5 100644
--- a/arch/x86_64/kernel/time.c
+++ b/arch/x86_64/kernel/time.c
@@ -959,9 +959,6 @@ static __init int unsynchronized_tsc(void)
            are handled in the OEM check above. */
         if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL)
                 return 0;
-        /* All in a single socket - should be synchronized */
-        if (cpus_weight(cpu_core_map[0]) == num_online_cpus())
-                return 0;
 #endif
         /* Assume multi socket systems are not synchronized */
         return num_online_cpus() > 1;
diff --git a/arch/x86_64/kernel/x8664_ksyms.c b/arch/x86_64/kernel/x8664_ksyms.c
index 68ec03070e5a..fd99ddd009bc 100644
--- a/arch/x86_64/kernel/x8664_ksyms.c
+++ b/arch/x86_64/kernel/x8664_ksyms.c
@@ -178,10 +178,6 @@ EXPORT_SYMBOL(rwsem_down_write_failed_thunk);
 
 EXPORT_SYMBOL(empty_zero_page);
 
-#ifdef CONFIG_HAVE_DEC_LOCK
-EXPORT_SYMBOL(_atomic_dec_and_lock);
-#endif
-
 EXPORT_SYMBOL(die_chain);
 EXPORT_SYMBOL(register_die_notifier);