[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..1c118b72d 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 @@
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 @@
(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_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
--- a/arch/ia64/kernel/mca.c
+++ b/arch/ia64/kernel/mca.c
@@ -271,7 +271,7 @@
#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
--- a/arch/ia64/kernel/topology.c
+++ b/arch/ia64/kernel/topology.c
@@ -36,6 +36,13 @@
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
--- a/include/asm-ia64/acpi.h
+++ b/include/asm-ia64/acpi.h
@@ -98,6 +98,15 @@
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
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -206,7 +206,10 @@
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 {