[PATCH v2 3/6] powerpc/perf: Support to export MMCRA[TEC*] field to userspace
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STALE3512d
SUPERSEDED
From: Madhavan Srinivasan <hidden>
Date: 2017-03-06 10:46:20
Also in:
lkml
Subsystem:
linux for powerpc (32-bit and 64-bit), the rest · Maintainers:
Madhavan Srinivasan, Linus Torvalds
Status: Superseded by v3 (posted 2017-03-23). [go to v3]
Revision v2 (3 revisions archived).
Revisions (3)
- v1 re-posted go to this post
- v2 current [diff against previous]
- v3 [diff against previous] re-posted go to this post
Threshold feature when used with MMCRA [Threshold Event Counter Event], MMCRA[Threshold Start event] and MMCRA[Threshold End event] will update MMCRA[Threashold Event Counter Exponent] and MMCRA[Threshold Event Counter Multiplier] with the corresponding threshold event count values. Patch to export MMCRA[TECX/TECM] to userspace in 'weight' field of struct perf_sample_data. Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <redacted> Cc: Thomas Gleixner <redacted> Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Cc: Anna-Maria Gleixner <anna-maria@linutronix.de> Cc: Daniel Axtens <redacted> Cc: Sukadev Bhattiprolu <redacted> Signed-off-by: Madhavan Srinivasan <redacted> --- arch/powerpc/include/asm/perf_event_server.h | 1 + arch/powerpc/perf/core-book3s.c | 4 ++++ arch/powerpc/perf/isa207-common.c | 8 ++++++++ arch/powerpc/perf/isa207-common.h | 10 ++++++++++ 4 files changed, 23 insertions(+)
diff --git a/arch/powerpc/include/asm/perf_event_server.h b/arch/powerpc/include/asm/perf_event_server.h
index 446cdcd9b7f5..723bf48e7494 100644
--- a/arch/powerpc/include/asm/perf_event_server.h
+++ b/arch/powerpc/include/asm/perf_event_server.h@@ -40,6 +40,7 @@ struct power_pmu { u64 alt[]); void (*get_mem_data_src)(union perf_mem_data_src *dsrc, u32 flags, struct pt_regs *regs); + void (*get_mem_weight)(u64 *weight); u64 (*bhrb_filter_map)(u64 branch_sample_type); void (*config_bhrb)(u64 pmu_bhrb_filter); void (*disable_pmc)(unsigned int pmc, unsigned long mmcr[]);
diff --git a/arch/powerpc/perf/core-book3s.c b/arch/powerpc/perf/core-book3s.c
index d644c5ab4d2f..a6b265e31663 100644
--- a/arch/powerpc/perf/core-book3s.c
+++ b/arch/powerpc/perf/core-book3s.c@@ -2051,6 +2051,10 @@ static void record_and_restart(struct perf_event *event, unsigned long val, ppmu->get_mem_data_src) ppmu->get_mem_data_src(&data.data_src, ppmu->flags, regs); + if (event->attr.sample_type & PERF_SAMPLE_WEIGHT && + ppmu->get_mem_weight) + ppmu->get_mem_weight(&data.weight); + if (perf_event_overflow(event, &data, regs)) power_pmu_stop(event, 0); }
diff --git a/arch/powerpc/perf/isa207-common.c b/arch/powerpc/perf/isa207-common.c
index 08bb62454a2e..42e999da934e 100644
--- a/arch/powerpc/perf/isa207-common.c
+++ b/arch/powerpc/perf/isa207-common.c@@ -196,6 +196,14 @@ void isa207_get_mem_data_src(union perf_mem_data_src *dsrc, u32 flags, } } +void isa207_get_mem_weight(u64 *weight) +{ + u64 mmcra = mfspr(SPRN_MMCRA); + u64 exp = MMCRA_THR_CTR_EXP(mmcra); + u64 mantissa = MMCRA_THR_CTR_MANT(mmcra); + + *weight = mantissa << (2 * exp); +} int isa207_get_constraint(u64 event, unsigned long *maskp, unsigned long *valp) {
diff --git a/arch/powerpc/perf/isa207-common.h b/arch/powerpc/perf/isa207-common.h
index 982542cce991..b4d02ae3a6e0 100644
--- a/arch/powerpc/perf/isa207-common.h
+++ b/arch/powerpc/perf/isa207-common.h@@ -247,6 +247,15 @@ #define MMCRA_SDAR_MODE_SHIFT 42 #define MMCRA_SDAR_MODE_TLB (1ull << MMCRA_SDAR_MODE_SHIFT) #define MMCRA_IFM_SHIFT 30 +#define MMCRA_THR_CTR_MANT_SHIFT 19 +#define MMCRA_THR_CTR_MANT_MASK 0x7Ful +#define MMCRA_THR_CTR_MANT(v) (((v) >> MMCRA_THR_CTR_MANT_SHIFT) &\ + MMCRA_THR_CTR_MANT_MASK) + +#define MMCRA_THR_CTR_EXP_SHIFT 27 +#define MMCRA_THR_CTR_EXP_MASK 0x7ul +#define MMCRA_THR_CTR_EXP(v) (((v) >> MMCRA_THR_CTR_EXP_SHIFT) &\ + MMCRA_THR_CTR_EXP_MASK) /* MMCR1 Threshold Compare bit constant for power9 */ #define p9_MMCRA_THR_CMP_SHIFT 45
@@ -281,5 +290,6 @@ int isa207_get_alternatives(u64 event, u64 alt[], const unsigned int ev_alt[][MAX_ALT], int size); void isa207_get_mem_data_src(union perf_mem_data_src *dsrc, u32 flags, struct pt_regs *regs); +void isa207_get_mem_weight(u64 *weight); #endif
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2.7.4