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authorHans Rosenfeld <hans.rosenfeld@amd.com>2010-07-28 19:09:31 +0200
committerPaul Gortmaker <paul.gortmaker@windriver.com>2012-03-14 10:57:13 -0400
commit4ce7766478329b5f9b110fe4ff59b6c076f31b04 (patch)
tree2309ece4b6f889a0a6727e6eed4dafb4f58711f7 /arch/x86
parent8be5957887fc21f67a8c122a0b1c098732d32c5f (diff)
x86, cpu: Clean up AMD erratum 400 workaround
commit 9d8888c2a214aece2494a49e699a097c2ba9498b upstream. Remove check_c1e_idle() and use the new AMD errata checking framework instead. Signed-off-by: Hans Rosenfeld <hans.rosenfeld@amd.com> LKML-Reference: <1280336972-865982-2-git-send-email-hans.rosenfeld@amd.com> Signed-off-by: H. Peter Anvin <hpa@linux.intel.com> Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Diffstat (limited to 'arch/x86')
-rw-r--r--arch/x86/include/asm/processor.h1
-rw-r--r--arch/x86/kernel/cpu/amd.c5
-rw-r--r--arch/x86/kernel/process.c39
3 files changed, 8 insertions, 37 deletions
diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
index b2130592ecf..7eb1dd73b9a 100644
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -1035,6 +1035,7 @@ unsigned long calc_aperfmperf_ratio(struct aperfmperf *old,
* AMD errata checking
*/
#ifdef CONFIG_CPU_SUP_AMD
+extern const int amd_erratum_400[];
extern bool cpu_has_amd_erratum(const int *);
#define AMD_LEGACY_ERRATUM(...) { -1, __VA_ARGS__, 0 }
diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c
index 1d0c58e6166..08dd1beb746 100644
--- a/arch/x86/kernel/cpu/amd.c
+++ b/arch/x86/kernel/cpu/amd.c
@@ -628,6 +628,11 @@ cpu_dev_register(amd_cpu_dev);
* AMD_MODEL_RANGE(0x10, 0x9, 0x0, 0x9, 0x0));
*/
+const int amd_erratum_400[] =
+ AMD_OSVW_ERRATUM(1, AMD_MODEL_RANGE(0xf, 0x41, 0x2, 0xff, 0xf),
+ AMD_MODEL_RANGE(0x10, 0x2, 0x1, 0xff, 0xf));
+
+
bool cpu_has_amd_erratum(const int *erratum)
{
struct cpuinfo_x86 *cpu = &current_cpu_data;
diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c
index 0415c3ef91b..efabf8fad0e 100644
--- a/arch/x86/kernel/process.c
+++ b/arch/x86/kernel/process.c
@@ -525,42 +525,6 @@ static int __cpuinit mwait_usable(const struct cpuinfo_x86 *c)
return (edx & MWAIT_EDX_C1);
}
-/*
- * Check for AMD CPUs, where APIC timer interrupt does not wake up CPU from C1e.
- * For more information see
- * - Erratum #400 for NPT family 0xf and family 0x10 CPUs
- * - Erratum #365 for family 0x11 (not affected because C1e not in use)
- */
-static int __cpuinit check_c1e_idle(const struct cpuinfo_x86 *c)
-{
- u64 val;
- if (c->x86_vendor != X86_VENDOR_AMD)
- goto no_c1e_idle;
-
- /* Family 0x0f models < rev F do not have C1E */
- if (c->x86 == 0x0F && c->x86_model >= 0x40)
- return 1;
-
- if (c->x86 == 0x10) {
- /*
- * check OSVW bit for CPUs that are not affected
- * by erratum #400
- */
- if (cpu_has(c, X86_FEATURE_OSVW)) {
- rdmsrl(MSR_AMD64_OSVW_ID_LENGTH, val);
- if (val >= 2) {
- rdmsrl(MSR_AMD64_OSVW_STATUS, val);
- if (!(val & BIT(1)))
- goto no_c1e_idle;
- }
- }
- return 1;
- }
-
-no_c1e_idle:
- return 0;
-}
-
static cpumask_var_t c1e_mask;
static int c1e_detected;
@@ -638,7 +602,8 @@ void __cpuinit select_idle_routine(const struct cpuinfo_x86 *c)
*/
printk(KERN_INFO "using mwait in idle threads.\n");
pm_idle = mwait_idle;
- } else if (check_c1e_idle(c)) {
+ } else if (cpu_has_amd_erratum(amd_erratum_400)) {
+ /* E400: APIC timer interrupt does not wake up CPU from C1e */
printk(KERN_INFO "using C1E aware idle routine\n");
pm_idle = c1e_idle;
} else