Commit b1113557 authored by Anshuman Khandual's avatar Anshuman Khandual Committed by Benjamin Herrenschmidt
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powerpc/perf: Define BHRB generic functions, data and flags for POWER8



This patch populates BHRB specific data for power_pmu structure. It
also implements POWER8 specific BHRB filter and configuration functions.
Signed-off-by: default avatarAnshuman Khandual <khandual@linux.vnet.ibm.com>
Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
parent 5afc9b52
......@@ -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)
......
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