diff options
| 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 | |
| parent | e8294de53bb788b3a6f7c09d143c7cdc60b65753 (diff) | |
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')
| -rw-r--r-- | arch/powerpc/include/asm/perf_event_server.h | 1 | ||||
| -rw-r--r-- | arch/powerpc/include/asm/reg.h | 4 |
2 files changed, 5 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() diff --git a/arch/powerpc/include/asm/reg.h b/arch/powerpc/include/asm/reg.h index a1096fb62816..d24c14163966 100644 --- a/arch/powerpc/include/asm/reg.h +++ b/arch/powerpc/include/asm/reg.h @@ -606,6 +606,10 @@ #define POWER6_MMCRA_SIPR 0x0000020000000000ULL #define POWER6_MMCRA_THRM 0x00000020UL #define POWER6_MMCRA_OTHER 0x0000000EUL + +#define POWER7P_MMCRA_SIAR_VALID 0x10000000 /* P7+ SIAR contents valid */ +#define POWER7P_MMCRA_SDAR_VALID 0x08000000 /* P7+ SDAR contents valid */ + #define SPRN_PMC1 787 #define SPRN_PMC2 788 #define SPRN_PMC3 789 |