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powerpc/perf: Support to export MMCRA[TEC*] field to userspace 

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.

Signed-off-by: Madhavan Srinivasan <maddy@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Madhavan Srinivasan 2017-04-11 07:21:07 +05:30 committed by Michael Ellerman
parent 79e96f8f93
commit 170a315f41
4 changed files with 23 additions and 0 deletions
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1
arch/powerpc/include/asm/perf_event_server.h
View File

@ -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[]);

4
arch/powerpc/perf/core-book3s.c
View File

@ -2053,6 +2053,10 @@ 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);
}

8
arch/powerpc/perf/isa207-common.c
View File

@ -221,6 +221,14 @@ 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)
{

10
arch/powerpc/perf/isa207-common.h
View File

@ -248,6 +248,15 @@
#define MMCRA_SDAR_MODE_TLB (1ull << MMCRA_SDAR_MODE_SHIFT)
#define MMCRA_SDAR_MODE_NO_UPDATES ~(0x3ull << 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
@ -282,5 +291,6 @@ 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