[ACPI] Evaluate CPEI Processor Override flag

ACPI 3.0 added a Correctable Platform Error Interrupt (CPEI)
Processor Overide flag to MADT.Platform_Interrupt_Source.
Record the processor that was provided as hint from ACPI.

Signed-off-by: Ashok Raj <ashok.raj@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

5 files changed, 75 insertions, 2 deletions

diff --git a/arch/ia64/kernel/acpi.c b/arch/ia64/kernel/acpi.c
index 72dfd9e7de0f..1c118b72df3c 100644
--- a/arch/ia64/kernel/acpi.c
+++ b/arch/ia64/kernel/acpi.c
@@ -11,6 +11,7 @@
  *  Copyright (C) 2001 Jenna Hall <jenna.s.hall@intel.com>
  *  Copyright (C) 2001 Takayoshi Kochi <t-kochi@bq.jp.nec.com>
  *  Copyright (C) 2002 Erich Focht <efocht@ess.nec.de>
+ *  Copyright (C) 2004 Ashok Raj <ashok.raj@intel.com>
  *
  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  *
@@ -67,6 +68,11 @@ EXPORT_SYMBOL(pm_power_off);
 unsigned char acpi_kbd_controller_present = 1;
 unsigned char acpi_legacy_devices;
 
+static unsigned int __initdata acpi_madt_rev;
+
+unsigned int acpi_cpei_override;
+unsigned int acpi_cpei_phys_cpuid;
+
 #define MAX_SAPICS 256
 u16 ia64_acpiid_to_sapicid[MAX_SAPICS] =
         { [0 ... MAX_SAPICS - 1] = -1 };
@@ -267,10 +273,56 @@ acpi_parse_plat_int_src (
                                                 (plintsrc->flags.trigger == 1) ? IOSAPIC_EDGE : IOSAPIC_LEVEL);
 
         platform_intr_list[plintsrc->type] = vector;
+        if (acpi_madt_rev > 1) {
+                acpi_cpei_override = plintsrc->plint_flags.cpei_override_flag;
+        }
+
+        /*
+         * Save the physical id, so we can check when its being removed
+         */
+        acpi_cpei_phys_cpuid = ((plintsrc->id << 8) | (plintsrc->eid)) & 0xffff;
+
         return 0;
 }
 
 
+unsigned int can_cpei_retarget(void)
+{
+        extern int cpe_vector;
+
+        /*
+         * Only if CPEI is supported and the override flag
+         * is present, otherwise return that its re-targettable
+         * if we are in polling mode.
+         */
+        if (cpe_vector > 0 && !acpi_cpei_override)
+                return 0;
+        else
+                return 1;
+}
+
+unsigned int is_cpu_cpei_target(unsigned int cpu)
+{
+        unsigned int logical_id;
+
+        logical_id = cpu_logical_id(acpi_cpei_phys_cpuid);
+
+        if (logical_id == cpu)
+                return 1;
+        else
+                return 0;
+}
+
+void set_cpei_target_cpu(unsigned int cpu)
+{
+        acpi_cpei_phys_cpuid = cpu_physical_id(cpu);
+}
+
+unsigned int get_cpei_target_cpu(void)
+{
+        return acpi_cpei_phys_cpuid;
+}
+
 static int __init
 acpi_parse_int_src_ovr (
         acpi_table_entry_header *header, const unsigned long end)
@@ -328,6 +380,8 @@ acpi_parse_madt (unsigned long phys_addr, unsigned long size)
 
         acpi_madt = (struct acpi_table_madt *) __va(phys_addr);
 
+        acpi_madt_rev = acpi_madt->header.revision;
+
         /* remember the value for reference after free_initmem() */
 #ifdef CONFIG_ITANIUM
         has_8259 = 1; /* Firmware on old Itanium systems is broken */
diff --git a/arch/ia64/kernel/mca.c b/arch/ia64/kernel/mca.c
index 736e328b5e61..4ebbf3974381 100644
--- a/arch/ia64/kernel/mca.c
+++ b/arch/ia64/kernel/mca.c
@@ -271,7 +271,7 @@ ia64_mca_log_sal_error_record(int sal_info_type)
 
 #ifdef CONFIG_ACPI
 
-static int cpe_vector = -1;
+int cpe_vector = -1;
 
 static irqreturn_t
 ia64_mca_cpe_int_handler (int cpe_irq, void *arg, struct pt_regs *ptregs)
diff --git a/arch/ia64/kernel/topology.c b/arch/ia64/kernel/topology.c
index f1aafd4c05f9..d8030f3bd865 100644
--- a/arch/ia64/kernel/topology.c
+++ b/arch/ia64/kernel/topology.c
@@ -36,6 +36,13 @@ int arch_register_cpu(int num)
         parent = &sysfs_nodes[cpu_to_node(num)];
 #endif /* CONFIG_NUMA */
 
+        /*
+         * If CPEI cannot be re-targetted, and this is
+         * CPEI target, then dont create the control file
+         */
+        if (!can_cpei_retarget() && is_cpu_cpei_target(num))
+                sysfs_cpus[num].cpu.no_control = 1;
+
         return register_cpu(&sysfs_cpus[num].cpu, num, parent);
 }
 
diff --git a/include/asm-ia64/acpi.h b/include/asm-ia64/acpi.h
index 6a26a977f253..4c06d455139c 100644
--- a/include/asm-ia64/acpi.h
+++ b/include/asm-ia64/acpi.h
@@ -98,6 +98,15 @@ const char *acpi_get_sysname (void);
 int acpi_request_vector (u32 int_type);
 int acpi_gsi_to_irq (u32 gsi, unsigned int *irq);
 
+/*
+ * Record the cpei override flag and current logical cpu. This is
+ * useful for CPU removal.
+ */
+extern unsigned int can_cpei_retarget(void);
+extern unsigned int is_cpu_cpei_target(unsigned int cpu);
+extern void set_cpei_target_cpu(unsigned int cpu);
+extern unsigned int get_cpei_target_cpu(void);
+
 #ifdef CONFIG_ACPI_NUMA
 /* Proximity bitmap length; _PXM is at most 255 (8 bit)*/
 #define MAX_PXM_DOMAINS (256)
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index b123cc08773d..70b3c52b75d7 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -206,7 +206,10 @@ struct acpi_table_plat_int_src {
         u8                      eid;
         u8                      iosapic_vector;
         u32                     global_irq;
-        u32                     reserved;
+        struct {
+                u32                     cpei_override_flag:1;
+                u32                     reserved:31;
+        }                       plint_flags;
 } __attribute__ ((packed));
 
 enum acpi_interrupt_id {