diff options
Diffstat (limited to 'arch/powerpc/perf/power8-pmu.c')
| -rw-r--r-- | arch/powerpc/perf/power8-pmu.c | 57 |
1 files changed, 56 insertions, 1 deletions
diff --git a/arch/powerpc/perf/power8-pmu.c b/arch/powerpc/perf/power8-pmu.c index c6aa713..f7d1c4f 100644 --- a/arch/powerpc/perf/power8-pmu.c +++ b/arch/powerpc/perf/power8-pmu.c @@ -109,6 +109,16 @@ #define EVENT_IS_MARKED (EVENT_MARKED_MASK << EVENT_MARKED_SHIFT) #define EVENT_PSEL_MASK 0xff /* PMCxSEL value */ +/* MMCRA IFM bits - POWER8 */ +#define POWER8_MMCRA_IFM1 0x0000000040000000UL +#define POWER8_MMCRA_IFM2 0x0000000080000000UL +#define POWER8_MMCRA_IFM3 0x00000000C0000000UL + +#define ONLY_PLM \ + (PERF_SAMPLE_BRANCH_USER |\ + PERF_SAMPLE_BRANCH_KERNEL |\ + PERF_SAMPLE_BRANCH_HV) + /* * Layout of constraint bits: * @@ -510,6 +520,48 @@ static int power8_generic_events[] = { [PERF_COUNT_HW_BRANCH_MISSES] = PM_BR_MPRED_CMPL, }; +static u64 power8_bhrb_filter_map(u64 branch_sample_type) +{ + u64 pmu_bhrb_filter = 0; + u64 br_privilege = branch_sample_type & ONLY_PLM; + + /* BHRB and regular PMU events share the same prvillege state + * filter configuration. BHRB is always recorded along with a + * regular PMU event. So privilege state filter criteria for BHRB + * and the companion PMU events has to be the same. As a default + * "perf record" tool sets all privillege bits ON when no filter + * criteria is provided in the command line. So as along as all + * privillege bits are ON or they are OFF, we are good to go. + */ + if ((br_privilege != 7) && (br_privilege != 0)) + return -1; + + /* No branch filter requested */ + if (branch_sample_type & PERF_SAMPLE_BRANCH_ANY) + return pmu_bhrb_filter; + + /* Invalid branch filter options - HW does not support */ + if (branch_sample_type & PERF_SAMPLE_BRANCH_ANY_RETURN) + return -1; + + if (branch_sample_type & PERF_SAMPLE_BRANCH_IND_CALL) + return -1; + + if (branch_sample_type & PERF_SAMPLE_BRANCH_ANY_CALL) { + pmu_bhrb_filter |= POWER8_MMCRA_IFM1; + return pmu_bhrb_filter; + } + + /* Every thing else is unsupported */ + return -1; +} + +static void power8_config_bhrb(u64 pmu_bhrb_filter) +{ + /* Enable BHRB filter in PMU */ + mtspr(SPRN_MMCRA, (mfspr(SPRN_MMCRA) | pmu_bhrb_filter)); +} + static struct power_pmu power8_pmu = { .name = "POWER8", .n_counter = 6, @@ -517,13 +569,16 @@ static struct power_pmu power8_pmu = { .add_fields = POWER8_ADD_FIELDS, .test_adder = POWER8_TEST_ADDER, .compute_mmcr = power8_compute_mmcr, + .config_bhrb = power8_config_bhrb, + .bhrb_filter_map = power8_bhrb_filter_map, .get_constraint = power8_get_constraint, .get_alternatives = power8_get_alternatives, .disable_pmc = power8_disable_pmc, - .flags = PPMU_HAS_SSLOT | PPMU_HAS_SIER, + .flags = PPMU_HAS_SSLOT | PPMU_HAS_SIER | PPMU_BHRB, .n_generic = ARRAY_SIZE(power8_generic_events), .generic_events = power8_generic_events, .attr_groups = power8_pmu_attr_groups, + .bhrb_nr = 32, }; static int __init init_power8_pmu(void) |