The patch titled
add X86_FEATURE_PEBS and detection
has been added to the -mm tree. Its filename is
add-x86_feature_pebs-and-detection.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: add X86_FEATURE_PEBS and detection
From: Stephane Eranian <eranian@xxxxxxxxxx>
Here is a patch (used by perfmon2) to detect the presence of the Precise Event
Based Sampling (PEBS) feature for Intel 64-bit processors. The patch also
adds the cpu_has_pebs macro.
- adds X86_FEATURE_PEBS
- adds cpu_has_pebs to test for X86_FEATURE_PEBS
Signed-off-by: stephane eranian <eranian@xxxxxxxxxx>
Cc: Andi Kleen <ak@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
arch/x86_64/kernel/setup.c | 7 +++++++
include/asm-x86_64/cpufeature.h | 2 ++
2 files changed, 9 insertions(+)
diff -puN arch/x86_64/kernel/setup.c~add-x86_feature_pebs-and-detection arch/x86_64/kernel/setup.c
--- a/arch/x86_64/kernel/setup.c~add-x86_feature_pebs-and-detection
+++ a/arch/x86_64/kernel/setup.c
@@ -835,6 +835,13 @@ static void __cpuinit init_intel(struct
set_bit(X86_FEATURE_ARCH_PERFMON, &c->x86_capability);
}
+ if (cpu_has_ds) {
+ unsigned int l1, l2;
+ rdmsr(MSR_IA32_MISC_ENABLE, l1, l2);
+ if (!(l1 & (1<<12)))
+ set_bit(X86_FEATURE_PEBS, c->x86_capability);
+ }
+
n = c->extended_cpuid_level;
if (n >= 0x80000008) {
unsigned eax = cpuid_eax(0x80000008);
diff -puN include/asm-x86_64/cpufeature.h~add-x86_feature_pebs-and-detection include/asm-x86_64/cpufeature.h
--- a/include/asm-x86_64/cpufeature.h~add-x86_feature_pebs-and-detection
+++ a/include/asm-x86_64/cpufeature.h
@@ -68,6 +68,7 @@
#define X86_FEATURE_FXSAVE_LEAK (3*32+7) /* FIP/FOP/FDP leaks through FXSAVE */
#define X86_FEATURE_UP (3*32+8) /* SMP kernel running on UP */
#define X86_FEATURE_ARCH_PERFMON (3*32+9) /* Intel Architectural PerfMon */
+#define X86_FEATURE_PEBS (3*32+10) /* Precise-Event Based Sampling */
/* Intel-defined CPU features, CPUID level 0x00000001 (ecx), word 4 */
#define X86_FEATURE_XMM3 (4*32+ 0) /* Streaming SIMD Extensions-3 */
@@ -113,5 +114,6 @@
#define cpu_has_centaur_mcr 0
#define cpu_has_clflush boot_cpu_has(X86_FEATURE_CLFLSH)
#define cpu_has_ds boot_cpu_has(X86_FEATURE_DS)
+#define cpu_has_pebs boot_cpu_has(X86_FEATURE_PEBS)
#endif /* __ASM_X8664_CPUFEATURE_H */
_
Patches currently in -mm which might be from eranian@xxxxxxxxxx are
x86_64-add-missing-enter_idle-calls.patch
x86_64-rename-x86_feature_dtes-to-x86_feature_ds.patch
add-x86_feature_pebs-and-detection.patch
i386-rename-x86_feature_dtes-to-x86_feature_ds.patch
i386-add-x86_feature_pebs-and-detection.patch
adds-carta_random32-library-routine.patch
-
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