aboutsummaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorMichal Schmidt <mschmidt@redhat.com>2010-07-27 18:53:35 +0200
committerH. Peter Anvin <hpa@zytor.com>2010-08-02 08:45:56 -0700
commite8c534ec068af1a0845aceda373a9bfd2de62030 (patch)
tree7ee35fd4b0103c04465c1cc5406f036fc07df53e
parent9792db6174d9927700ed288e6d74b9391bf785d1 (diff)
x86: Fix keeping track of AMD C1E
Accomodate the original C1E-aware idle routine to the different times during boot when the BIOS enables C1E. While at it, remove the synthetic CPUID flag in favor of a single global setting which denotes C1E status on the system. [ hpa: changed c1e_enabled to be a bool; clarified cpu bit 3:21 comment ] Signed-off-by: Michal Schmidt <mschmidt@redhat.com> LKML-Reference: <20100727165335.GA11630@aftab> Signed-off-by: Borislav Petkov <borislav.petkov@amd.com> Signed-off-by: H. Peter Anvin <hpa@zytor.com> Acked-by: Thomas Gleixner <tglx@linutronix.de>
-rw-r--r--arch/x86/include/asm/acpi.h2
-rw-r--r--arch/x86/include/asm/cpufeature.h2
-rw-r--r--arch/x86/include/asm/processor.h1
-rw-r--r--arch/x86/kernel/process.c8
-rw-r--r--drivers/acpi/processor_idle.c2
5 files changed, 9 insertions, 6 deletions
diff --git a/arch/x86/include/asm/acpi.h b/arch/x86/include/asm/acpi.h
index aa2c39d968f..92091de1111 100644
--- a/arch/x86/include/asm/acpi.h
+++ b/arch/x86/include/asm/acpi.h
@@ -134,7 +134,7 @@ static inline unsigned int acpi_processor_cstate_check(unsigned int max_cstate)
boot_cpu_data.x86_model <= 0x05 &&
boot_cpu_data.x86_mask < 0x0A)
return 1;
- else if (boot_cpu_has(X86_FEATURE_AMDC1E))
+ else if (c1e_detected)
return 1;
else
return max_cstate;
diff --git a/arch/x86/include/asm/cpufeature.h b/arch/x86/include/asm/cpufeature.h
index 817aa316b18..0b205b8a430 100644
--- a/arch/x86/include/asm/cpufeature.h
+++ b/arch/x86/include/asm/cpufeature.h
@@ -89,7 +89,7 @@
#define X86_FEATURE_LFENCE_RDTSC (3*32+18) /* "" Lfence synchronizes RDTSC */
#define X86_FEATURE_11AP (3*32+19) /* "" Bad local APIC aka 11AP */
#define X86_FEATURE_NOPL (3*32+20) /* The NOPL (0F 1F) instructions */
-#define X86_FEATURE_AMDC1E (3*32+21) /* AMD C1E detected */
+ /* 21 available, was AMD_C1E */
#define X86_FEATURE_XTOPOLOGY (3*32+22) /* cpu topology enum extensions */
#define X86_FEATURE_TSC_RELIABLE (3*32+23) /* TSC is known to be reliable */
#define X86_FEATURE_NONSTOP_TSC (3*32+24) /* TSC does not stop in C states */
diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
index d85637bb950..325b7bdbeba 100644
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -762,6 +762,7 @@ extern void init_c1e_mask(void);
extern unsigned long boot_option_idle_override;
extern unsigned long idle_halt;
extern unsigned long idle_nomwait;
+extern bool c1e_detected;
/*
* on systems with caches, caches must be flashed as the absolute
diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c
index 553b02f1309..b944f89c4e6 100644
--- a/arch/x86/kernel/process.c
+++ b/arch/x86/kernel/process.c
@@ -525,8 +525,10 @@ static int __cpuinit mwait_usable(const struct cpuinfo_x86 *c)
return (edx & MWAIT_EDX_C1);
}
+bool c1e_detected;
+EXPORT_SYMBOL(c1e_detected);
+
static cpumask_var_t c1e_mask;
-static int c1e_detected;
void c1e_remove_cpu(int cpu)
{
@@ -548,12 +550,12 @@ static void c1e_idle(void)
u32 lo, hi;
rdmsr(MSR_K8_INT_PENDING_MSG, lo, hi);
+
if (lo & K8_INTP_C1E_ACTIVE_MASK) {
- c1e_detected = 1;
+ c1e_detected = true;
if (!boot_cpu_has(X86_FEATURE_NONSTOP_TSC))
mark_tsc_unstable("TSC halt in AMD C1E");
printk(KERN_INFO "System has AMD C1E enabled\n");
- set_cpu_cap(&boot_cpu_data, X86_FEATURE_AMDC1E);
}
}
diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
index e9a8026d39f..eead3f581fb 100644
--- a/drivers/acpi/processor_idle.c
+++ b/drivers/acpi/processor_idle.c
@@ -164,7 +164,7 @@ static void lapic_timer_check_state(int state, struct acpi_processor *pr,
if (cpu_has(&cpu_data(pr->id), X86_FEATURE_ARAT))
return;
- if (boot_cpu_has(X86_FEATURE_AMDC1E))
+ if (c1e_detected)
type = ACPI_STATE_C1;
/*