[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>

diff --git a/arch/ia64/kernel/acpi.c b/arch/ia64/kernel/acpi.c
index 72dfd9e..1c118b7 100644 (file)
--- 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 736e328..4ebbf39 100644 (file)
--- 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 f1aafd4..d8030f3 100644 (file)
--- 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 6a26a97..4c06d45 100644 (file)
--- 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 b123cc0..70b3c52 100644 (file)
--- 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 {