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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

arch/powerpc/perf/power8-pmu.c

+56 −1
Original line number Diff line number Diff line
@@ -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)