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| author |   sukadev@linux.vnet.ibm.com <sukadev@linux.vnet.ibm.com> | 2012-09-18 20:56:11 +0000 |
|---|---|---|
| committer |   Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2012-09-27 12:51:05 +1000 |
| commit | e6878835ac4794f25385522d29c634b7bbb7cca9 (patch) | |
| tree | 31abcefb32c9388588b176bbca8709d97c5d3559 /arch/powerpc/include/asm/perf_event_server.h | |
| parent | Merge remote-tracking branch 'kumar/next' into next (diff) | |
| download | linux-dev-e6878835ac4794f25385522d29c634b7bbb7cca9.tar.xz linux-dev-e6878835ac4794f25385522d29c634b7bbb7cca9.zip | |
powerpc/perf: Sample only if SIAR-Valid bit is set in P7+
powerpc/perf: Sample only if SIAR-Valid bit is set in P7+
On POWER7+ two new bits (mmcra[35] and mmcra[36]) indicate whether the
contents of SIAR and SDAR are valid.
For marked instructions on P7+, we must save the contents of SIAR and
SDAR registers only if these new bits are set.
This code/check for the SIAR-Valid bit is specific to P7+, so rather than
waste a CPU-feature bit use the PVR flag.
Note that Carl Love proposed a similar change for oprofile:
https://lkml.org/lkml/2012/6/22/309
Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/include/asm/perf_event_server.h')
| -rw-r--r-- | arch/powerpc/include/asm/perf_event_server.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/perf_event_server.h b/arch/powerpc/include/asm/perf_event_server.h index 078019b5b353..9710be3a2d17 100644 --- a/arch/powerpc/include/asm/perf_event_server.h +++ b/arch/powerpc/include/asm/perf_event_server.h @@ -49,6 +49,7 @@ struct power_pmu { #define PPMU_ALT_SIPR 2 /* uses alternate posn for SIPR/HV */ #define PPMU_NO_SIPR 4 /* no SIPR/HV in MMCRA at all */ #define PPMU_NO_CONT_SAMPLING 8 /* no continuous sampling */ +#define PPMU_SIAR_VALID 16 /* Processor has SIAR Valid bit */ /* * Values for flags to get_alternatives() |