power9-pmu.c

/*
 * Performance counter support for POWER9 processors.
 *
 * Copyright 2009 Paul Mackerras, IBM Corporation.
 * Copyright 2013 Michael Ellerman, IBM Corporation.
 * Copyright 2016 Madhavan Srinivasan, IBM Corporation.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or later version.
 */

#define pr_fmt(fmt)	"power9-pmu: " fmt

#include "isa207-common.h"

/*
 * Some power9 event codes.
 */
#define EVENT(_name, _code)	_name = _code,

enum {
#include "power9-events-list.h"
};

#undef EVENT

/* MMCRA IFM bits - POWER9 */
#define POWER9_MMCRA_IFM1		0x0000000040000000UL
#define POWER9_MMCRA_IFM2		0x0000000080000000UL
#define POWER9_MMCRA_IFM3		0x00000000C0000000UL

/* PowerISA v2.07 format attribute structure*/
extern struct attribute_group isa207_pmu_format_group;

GENERIC_EVENT_ATTR(cpu-cycles,			PM_CYC);
GENERIC_EVENT_ATTR(stalled-cycles-frontend,	PM_ICT_NOSLOT_CYC);
GENERIC_EVENT_ATTR(stalled-cycles-backend,	PM_CMPLU_STALL);
GENERIC_EVENT_ATTR(instructions,		PM_INST_CMPL);
GENERIC_EVENT_ATTR(branch-instructions,		PM_BRU_CMPL);
GENERIC_EVENT_ATTR(branch-misses,		PM_BR_MPRED_CMPL);
GENERIC_EVENT_ATTR(cache-references,		PM_LD_REF_L1);
GENERIC_EVENT_ATTR(cache-misses,		PM_LD_MISS_L1_FIN);

CACHE_EVENT_ATTR(L1-dcache-load-misses,		PM_LD_MISS_L1_FIN);
CACHE_EVENT_ATTR(L1-dcache-loads,		PM_LD_REF_L1);
CACHE_EVENT_ATTR(L1-dcache-prefetches,		PM_L1_PREF);
CACHE_EVENT_ATTR(L1-dcache-store-misses,	PM_ST_MISS_L1);
CACHE_EVENT_ATTR(L1-icache-load-misses,		PM_L1_ICACHE_MISS);
CACHE_EVENT_ATTR(L1-icache-loads,		PM_INST_FROM_L1);
CACHE_EVENT_ATTR(L1-icache-prefetches,		PM_IC_PREF_WRITE);
CACHE_EVENT_ATTR(LLC-load-misses,		PM_DATA_FROM_L3MISS);
CACHE_EVENT_ATTR(LLC-loads,			PM_DATA_FROM_L3);
CACHE_EVENT_ATTR(LLC-prefetches,		PM_L3_PREF_ALL);
CACHE_EVENT_ATTR(LLC-store-misses,		PM_L2_ST_MISS);
CACHE_EVENT_ATTR(LLC-stores,			PM_L2_ST);
CACHE_EVENT_ATTR(branch-load-misses,		PM_BR_MPRED_CMPL);
CACHE_EVENT_ATTR(branch-loads,			PM_BRU_CMPL);
CACHE_EVENT_ATTR(dTLB-load-misses,		PM_DTLB_MISS);
CACHE_EVENT_ATTR(iTLB-load-misses,		PM_ITLB_MISS);

static struct attribute *power9_events_attr[] = {
	GENERIC_EVENT_PTR(PM_CYC),
	GENERIC_EVENT_PTR(PM_ICT_NOSLOT_CYC),
	GENERIC_EVENT_PTR(PM_CMPLU_STALL),
	GENERIC_EVENT_PTR(PM_INST_CMPL),
	GENERIC_EVENT_PTR(PM_BRU_CMPL),
	GENERIC_EVENT_PTR(PM_BR_MPRED_CMPL),
	GENERIC_EVENT_PTR(PM_LD_REF_L1),
	GENERIC_EVENT_PTR(PM_LD_MISS_L1_FIN),
	CACHE_EVENT_PTR(PM_LD_MISS_L1_FIN),
	CACHE_EVENT_PTR(PM_LD_REF_L1),
	CACHE_EVENT_PTR(PM_L1_PREF),
	CACHE_EVENT_PTR(PM_ST_MISS_L1),
	CACHE_EVENT_PTR(PM_L1_ICACHE_MISS),
	CACHE_EVENT_PTR(PM_INST_FROM_L1),
	CACHE_EVENT_PTR(PM_IC_PREF_WRITE),
	CACHE_EVENT_PTR(PM_DATA_FROM_L3MISS),
	CACHE_EVENT_PTR(PM_DATA_FROM_L3),
	CACHE_EVENT_PTR(PM_L3_PREF_ALL),
	CACHE_EVENT_PTR(PM_L2_ST_MISS),
	CACHE_EVENT_PTR(PM_L2_ST),
	CACHE_EVENT_PTR(PM_BR_MPRED_CMPL),
	CACHE_EVENT_PTR(PM_BRU_CMPL),
	CACHE_EVENT_PTR(PM_DTLB_MISS),
	CACHE_EVENT_PTR(PM_ITLB_MISS),
	NULL
};

static struct attribute_group power9_pmu_events_group = {
	.name = "events",
	.attrs = power9_events_attr,
};

static const struct attribute_group *power9_pmu_attr_groups[] = {
	&isa207_pmu_format_group,
	&power9_pmu_events_group,
	NULL,
};

static int power9_generic_events[] = {
	[PERF_COUNT_HW_CPU_CYCLES] =			PM_CYC,
	[PERF_COUNT_HW_STALLED_CYCLES_FRONTEND] =	PM_ICT_NOSLOT_CYC,
	[PERF_COUNT_HW_STALLED_CYCLES_BACKEND] =	PM_CMPLU_STALL,
	[PERF_COUNT_HW_INSTRUCTIONS] =			PM_INST_CMPL,
	[PERF_COUNT_HW_BRANCH_INSTRUCTIONS] =		PM_BRU_CMPL,
	[PERF_COUNT_HW_BRANCH_MISSES] =			PM_BR_MPRED_CMPL,
	[PERF_COUNT_HW_CACHE_REFERENCES] =		PM_LD_REF_L1,
	[PERF_COUNT_HW_CACHE_MISSES] =			PM_LD_MISS_L1_FIN,
};

static u64 power9_bhrb_filter_map(u64 branch_sample_type)
{
	u64 pmu_bhrb_filter = 0;

	/* BHRB and regular PMU events share the same privilege state
	 * filter configuration. BHRB is always recorded along with a
	 * regular PMU event. As the privilege state filter is handled
	 * in the basic PMC configuration of the accompanying regular
	 * PMU event, we ignore any separate BHRB specific request.
	 */

	/* 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_CALL)
		return -1;

	if (branch_sample_type & PERF_SAMPLE_BRANCH_ANY_CALL) {
		pmu_bhrb_filter |= POWER9_MMCRA_IFM1;
		return pmu_bhrb_filter;
	}

	/* Every thing else is unsupported */
	return -1;
}

static void power9_config_bhrb(u64 pmu_bhrb_filter)
{
	/* Enable BHRB filter in PMU */
	mtspr(SPRN_MMCRA, (mfspr(SPRN_MMCRA) | pmu_bhrb_filter));
}

#define C(x)	PERF_COUNT_HW_CACHE_##x

/*
 * Table of generalized cache-related events.
 * 0 means not supported, -1 means nonsensical, other values
 * are event codes.
 */
static int power9_cache_events[C(MAX)][C(OP_MAX)][C(RESULT_MAX)] = {
	[ C(L1D) ] = {
		[ C(OP_READ) ] = {
			[ C(RESULT_ACCESS) ] = PM_LD_REF_L1,
			[ C(RESULT_MISS)   ] = PM_LD_MISS_L1_FIN,
		},
		[ C(OP_WRITE) ] = {
			[ C(RESULT_ACCESS) ] = 0,
			[ C(RESULT_MISS)   ] = PM_ST_MISS_L1,
		},
		[ C(OP_PREFETCH) ] = {
			[ C(RESULT_ACCESS) ] = PM_L1_PREF,
			[ C(RESULT_MISS)   ] = 0,
		},
	},
	[ C(L1I) ] = {
		[ C(OP_READ) ] = {
			[ C(RESULT_ACCESS) ] = PM_INST_FROM_L1,
			[ C(RESULT_MISS)   ] = PM_L1_ICACHE_MISS,
		},
		[ C(OP_WRITE) ] = {
			[ C(RESULT_ACCESS) ] = PM_L1_DEMAND_WRITE,
			[ C(RESULT_MISS)   ] = -1,
		},
		[ C(OP_PREFETCH) ] = {
			[ C(RESULT_ACCESS) ] = PM_IC_PREF_WRITE,
			[ C(RESULT_MISS)   ] = 0,
		},
	},
	[ C(LL) ] = {
		[ C(OP_READ) ] = {
			[ C(RESULT_ACCESS) ] = PM_DATA_FROM_L3,
			[ C(RESULT_MISS)   ] = PM_DATA_FROM_L3MISS,
		},
		[ C(OP_WRITE) ] = {
			[ C(RESULT_ACCESS) ] = PM_L2_ST,
			[ C(RESULT_MISS)   ] = PM_L2_ST_MISS,
		},
		[ C(OP_PREFETCH) ] = {
			[ C(RESULT_ACCESS) ] = PM_L3_PREF_ALL,
			[ C(RESULT_MISS)   ] = 0,
		},
	},
	[ C(DTLB) ] = {
		[ C(OP_READ) ] = {
			[ C(RESULT_ACCESS) ] = 0,
			[ C(RESULT_MISS)   ] = PM_DTLB_MISS,
		},
		[ C(OP_WRITE) ] = {
			[ C(RESULT_ACCESS) ] = -1,
			[ C(RESULT_MISS)   ] = -1,
		},
		[ C(OP_PREFETCH) ] = {
			[ C(RESULT_ACCESS) ] = -1,
			[ C(RESULT_MISS)   ] = -1,
		},
	},
	[ C(ITLB) ] = {
		[ C(OP_READ) ] = {
			[ C(RESULT_ACCESS) ] = 0,
			[ C(RESULT_MISS)   ] = PM_ITLB_MISS,
		},
		[ C(OP_WRITE) ] = {
			[ C(RESULT_ACCESS) ] = -1,
			[ C(RESULT_MISS)   ] = -1,
		},
		[ C(OP_PREFETCH) ] = {
			[ C(RESULT_ACCESS) ] = -1,
			[ C(RESULT_MISS)   ] = -1,
		},
	},
	[ C(BPU) ] = {
		[ C(OP_READ) ] = {
			[ C(RESULT_ACCESS) ] = PM_BRU_CMPL,
			[ C(RESULT_MISS)   ] = PM_BR_MPRED_CMPL,
		},
		[ C(OP_WRITE) ] = {
			[ C(RESULT_ACCESS) ] = -1,
			[ C(RESULT_MISS)   ] = -1,
		},
		[ C(OP_PREFETCH) ] = {
			[ C(RESULT_ACCESS) ] = -1,
			[ C(RESULT_MISS)   ] = -1,
		},
	},
	[ C(NODE) ] = {
		[ C(OP_READ) ] = {
			[ C(RESULT_ACCESS) ] = -1,
			[ C(RESULT_MISS)   ] = -1,
		},
		[ C(OP_WRITE) ] = {
			[ C(RESULT_ACCESS) ] = -1,
			[ C(RESULT_MISS)   ] = -1,
		},
		[ C(OP_PREFETCH) ] = {
			[ C(RESULT_ACCESS) ] = -1,
			[ C(RESULT_MISS)   ] = -1,
		},
	},
};

#undef C

static struct power_pmu power9_pmu = {
	.name			= "POWER9",
	.n_counter		= MAX_PMU_COUNTERS,
	.add_fields		= ISA207_ADD_FIELDS,
	.test_adder		= ISA207_TEST_ADDER,
	.compute_mmcr		= isa207_compute_mmcr,
	.config_bhrb		= power9_config_bhrb,
	.bhrb_filter_map	= power9_bhrb_filter_map,
	.get_constraint		= isa207_get_constraint,
	.disable_pmc		= isa207_disable_pmc,
	.flags			= PPMU_HAS_SIER | PPMU_ARCH_207S,
	.n_generic		= ARRAY_SIZE(power9_generic_events),
	.generic_events		= power9_generic_events,
	.cache_events		= &power9_cache_events,
	.attr_groups		= power9_pmu_attr_groups,
	.bhrb_nr		= 32,
};

static int __init init_power9_pmu(void)
{
	int rc;

	/* Comes from cpu_specs[] */
	if (!cur_cpu_spec->oprofile_cpu_type ||
	    strcmp(cur_cpu_spec->oprofile_cpu_type, "ppc64/power9"))
		return -ENODEV;

	rc = register_power_pmu(&power9_pmu);
	if (rc)
		return rc;

	/* Tell userspace that EBB is supported */
	cur_cpu_spec->cpu_user_features2 |= PPC_FEATURE2_EBB;

	return 0;
}
early_initcall(init_power9_pmu);