diff options
| author | Alexander Shishkin <alexander.shishkin@linux.intel.com> | 2022-01-26 13:48:15 +0300 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2022-02-15 19:47:11 +0300 |
| commit | 161a9a33702a2e65a4118dacb449505ac8ce3122 (patch) | |
| tree | 2063cac219af871fb32240bb04756f2478dc0d58 /arch/x86/include/asm/msr-index.h | |
| parent | 28c24ded649cf068ca518f2a3d78f5e7e06d41d8 (diff) | |
| download | linux-161a9a33702a2e65a4118dacb449505ac8ce3122.tar.xz | |
perf/x86/intel/pt: Add a capability and config bit for disabling TNTs
As of Intel SDM (https://www.intel.com/sdm) version 076, there is a new
Intel PT feature called TNT-Disable which is enabled config bit 55.
TNT-Disable disables Taken-Not-Taken packets to reduce the tracing
overhead, but with the result that exact control flow information is
lost.
Add a capability and config bit for TNT-Disable.
Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Adrian Hunter <adrian.hunter@intel.com>
Link: https://lore.kernel.org/r/20220126104815.2807416-3-adrian.hunter@intel.com
Diffstat (limited to 'arch/x86/include/asm/msr-index.h')
| -rw-r--r-- | arch/x86/include/asm/msr-index.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/x86/include/asm/msr-index.h b/arch/x86/include/asm/msr-index.h index 79b392d893e3..efd34cfa1720 100644 --- a/arch/x86/include/asm/msr-index.h +++ b/arch/x86/include/asm/msr-index.h @@ -206,6 +206,7 @@ #define RTIT_CTL_PTW_EN BIT(12) #define RTIT_CTL_BRANCH_EN BIT(13) #define RTIT_CTL_EVENT_EN BIT(31) +#define RTIT_CTL_NOTNT BIT_ULL(55) #define RTIT_CTL_MTC_RANGE_OFFSET 14 #define RTIT_CTL_MTC_RANGE (0x0full << RTIT_CTL_MTC_RANGE_OFFSET) #define RTIT_CTL_CYC_THRESH_OFFSET 19 |