arch/powerpc/perf/power7-pmu.c - arm/linux-arm64-legacy - Git at Google

 /*
  * Performance counter support for POWER7 processors.
  *
  * Copyright 2009 Paul Mackerras, 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 (at your option) any later version.
  */
 #include <linux/kernel.h>
 #include <linux/perf_event.h>
 #include <linux/string.h>
 #include <asm/reg.h>
 #include <asm/cputable.h>

 /*
  * Bits in event code for POWER7
  */
 #define PM_PMC_SH	16	/* PMC number (1-based) for direct events */
 #define PM_PMC_MSK	0xf
 #define PM_PMC_MSKS	(PM_PMC_MSK << PM_PMC_SH)
 #define PM_UNIT_SH	12	/* TTMMUX number and setting - unit select */
 #define PM_UNIT_MSK	0xf
 #define PM_COMBINE_SH	11	/* Combined event bit */
 #define PM_COMBINE_MSK	1
 #define PM_COMBINE_MSKS	0x800
 #define PM_L2SEL_SH	8	/* L2 event select */
 #define PM_L2SEL_MSK	7
 #define PM_PMCSEL_MSK	0xff

 /*
  * Bits in MMCR1 for POWER7
  */
 #define MMCR1_TTM0SEL_SH	60
 #define MMCR1_TTM1SEL_SH	56
 #define MMCR1_TTM2SEL_SH	52
 #define MMCR1_TTM3SEL_SH	48
 #define MMCR1_TTMSEL_MSK	0xf
 #define MMCR1_L2SEL_SH		45
 #define MMCR1_L2SEL_MSK		7
 #define MMCR1_PMC1_COMBINE_SH	35
 #define MMCR1_PMC2_COMBINE_SH	34
 #define MMCR1_PMC3_COMBINE_SH	33
 #define MMCR1_PMC4_COMBINE_SH	32
 #define MMCR1_PMC1SEL_SH	24
 #define MMCR1_PMC2SEL_SH	16
 #define MMCR1_PMC3SEL_SH	8
 #define MMCR1_PMC4SEL_SH	0
 #define MMCR1_PMCSEL_SH(n)	(MMCR1_PMC1SEL_SH - (n) * 8)
 #define MMCR1_PMCSEL_MSK	0xff

 /*
  * Power7 event codes.
  */
 #define EVENT(_name, _code) \
 	PME_##_name = _code,

 enum {
 #include "power7-events-list.h"
 };
 #undef EVENT

 /*
  * Layout of constraint bits:
  * 6666555555555544444444443333333333222222222211111111110000000000
  * 3210987654321098765432109876543210987654321098765432109876543210
  *                                              < ><  ><><><><><><>
  *                                              L2  NC P6P5P4P3P2P1
  *
  * L2 - 16-18 - Required L2SEL value (select field)
  *
  * NC - number of counters
  *     15: NC error 0x8000
  *     12-14: number of events needing PMC1-4 0x7000
  *
  * P6
  *     11: P6 error 0x800
  *     10-11: Count of events needing PMC6
  *
  * P1..P5
  *     0-9: Count of events needing PMC1..PMC5
  */

 static int power7_get_constraint(u64 event, unsigned long *maskp,
 				 unsigned long *valp)
 {
 	int pmc, sh, unit;
 	unsigned long mask = 0, value = 0;

 	pmc = (event >> PM_PMC_SH) & PM_PMC_MSK;
 	if (pmc) {
 		if (pmc > 6)
 			return -1;
 		sh = (pmc - 1) * 2;
 		mask |= 2 << sh;
 		value |= 1 << sh;
 		if (pmc >= 5 && !(event == 0x500fa || event == 0x600f4))
 			return -1;
 	}
 	if (pmc < 5) {
 		/* need a counter from PMC1-4 set */
 		mask  |= 0x8000;
 		value |= 0x1000;
 	}

 	unit = (event >> PM_UNIT_SH) & PM_UNIT_MSK;
 	if (unit == 6) {
 		/* L2SEL must be identical across events */
 		int l2sel = (event >> PM_L2SEL_SH) & PM_L2SEL_MSK;
 		mask  |= 0x7 << 16;
 		value |= l2sel << 16;
 	}

 	*maskp = mask;
 	*valp = value;
 	return 0;
 }

 #define MAX_ALT	2	/* at most 2 alternatives for any event */

 static const unsigned int event_alternatives[][MAX_ALT] = {
 	{ 0x200f2, 0x300f2 },		/* PM_INST_DISP */
 	{ 0x200f4, 0x600f4 },		/* PM_RUN_CYC */
 	{ 0x400fa, 0x500fa },		/* PM_RUN_INST_CMPL */
 };

 /*
  * Scan the alternatives table for a match and return the
  * index into the alternatives table if found, else -1.
  */
 static int find_alternative(u64 event)
 {
 	int i, j;

 	for (i = 0; i < ARRAY_SIZE(event_alternatives); ++i) {
 		if (event < event_alternatives[i][0])
 			break;
 		for (j = 0; j < MAX_ALT && event_alternatives[i][j]; ++j)
 			if (event == event_alternatives[i][j])
 				return i;
 	}
 	return -1;
 }

 static s64 find_alternative_decode(u64 event)
 {
 	int pmc, psel;

 	/* this only handles the 4x decode events */
 	pmc = (event >> PM_PMC_SH) & PM_PMC_MSK;
 	psel = event & PM_PMCSEL_MSK;
 	if ((pmc == 2 || pmc == 4) && (psel & ~7) == 0x40)
 		return event - (1 << PM_PMC_SH) + 8;
 	if ((pmc == 1 || pmc == 3) && (psel & ~7) == 0x48)
 		return event + (1 << PM_PMC_SH) - 8;
 	return -1;
 }

 static int power7_get_alternatives(u64 event, unsigned int flags, u64 alt[])
 {
 	int i, j, nalt = 1;
 	s64 ae;

 	alt[0] = event;
 	nalt = 1;
 	i = find_alternative(event);
 	if (i >= 0) {
 		for (j = 0; j < MAX_ALT; ++j) {
 			ae = event_alternatives[i][j];
 			if (ae && ae != event)
 				alt[nalt++] = ae;
 		}
 	} else {
 		ae = find_alternative_decode(event);
 		if (ae > 0)
 			alt[nalt++] = ae;
 	}

 	if (flags & PPMU_ONLY_COUNT_RUN) {
 		/*
 		 * We're only counting in RUN state,
 		 * so PM_CYC is equivalent to PM_RUN_CYC
 		 * and PM_INST_CMPL === PM_RUN_INST_CMPL.
 		 * This doesn't include alternatives that don't provide
 		 * any extra flexibility in assigning PMCs.
 		 */
 		j = nalt;
 		for (i = 0; i < nalt; ++i) {
 			switch (alt[i]) {
 			case 0x1e:	/* PM_CYC */
 				alt[j++] = 0x600f4;	/* PM_RUN_CYC */
 				break;
 			case 0x600f4:	/* PM_RUN_CYC */
 				alt[j++] = 0x1e;
 				break;
 			case 0x2:	/* PM_PPC_CMPL */
 				alt[j++] = 0x500fa;	/* PM_RUN_INST_CMPL */
 				break;
 			case 0x500fa:	/* PM_RUN_INST_CMPL */
 				alt[j++] = 0x2;	/* PM_PPC_CMPL */
 				break;
 			}
 		}
 		nalt = j;
 	}

 	return nalt;
 }

 /*
  * Returns 1 if event counts things relating to marked instructions
  * and thus needs the MMCRA_SAMPLE_ENABLE bit set, or 0 if not.
  */
 static int power7_marked_instr_event(u64 event)
 {
 	int pmc, psel;
 	int unit;

 	pmc = (event >> PM_PMC_SH) & PM_PMC_MSK;
 	unit = (event >> PM_UNIT_SH) & PM_UNIT_MSK;
 	psel = event & PM_PMCSEL_MSK & ~1;	/* trim off edge/level bit */
 	if (pmc >= 5)
 		return 0;

 	switch (psel >> 4) {
 	case 2:
 		return pmc == 2 || pmc == 4;
 	case 3:
 		if (psel == 0x3c)
 			return pmc == 1;
 		if (psel == 0x3e)
 			return pmc != 2;
 		return 1;
 	case 4:
 	case 5:
 		return unit == 0xd;
 	case 6:
 		if (psel == 0x64)
 			return pmc >= 3;
 	case 8:
 		return unit == 0xd;
 	}
 	return 0;
 }

 static int power7_compute_mmcr(u64 event[], int n_ev,
 			       unsigned int hwc[], unsigned long mmcr[])
 {
 	unsigned long mmcr1 = 0;
 	unsigned long mmcra = MMCRA_SDAR_DCACHE_MISS | MMCRA_SDAR_ERAT_MISS;
 	unsigned int pmc, unit, combine, l2sel, psel;
 	unsigned int pmc_inuse = 0;
 	int i;

 	/* First pass to count resource use */
 	for (i = 0; i < n_ev; ++i) {
 		pmc = (event[i] >> PM_PMC_SH) & PM_PMC_MSK;
 		if (pmc) {
 			if (pmc > 6)
 				return -1;
 			if (pmc_inuse & (1 << (pmc - 1)))
 				return -1;
 			pmc_inuse |= 1 << (pmc - 1);
 		}
 	}

 	/* Second pass: assign PMCs, set all MMCR1 fields */
 	for (i = 0; i < n_ev; ++i) {
 		pmc = (event[i] >> PM_PMC_SH) & PM_PMC_MSK;
 		unit = (event[i] >> PM_UNIT_SH) & PM_UNIT_MSK;
 		combine = (event[i] >> PM_COMBINE_SH) & PM_COMBINE_MSK;
 		l2sel = (event[i] >> PM_L2SEL_SH) & PM_L2SEL_MSK;
 		psel = event[i] & PM_PMCSEL_MSK;
 		if (!pmc) {
 			/* Bus event or any-PMC direct event */
 			for (pmc = 0; pmc < 4; ++pmc) {
 				if (!(pmc_inuse & (1 << pmc)))
 					break;
 			}
 			if (pmc >= 4)
 				return -1;
 			pmc_inuse |= 1 << pmc;
 		} else {
 			/* Direct or decoded event */
 			--pmc;
 		}
 		if (pmc <= 3) {
 			mmcr1 |= (unsigned long) unit
 				<< (MMCR1_TTM0SEL_SH - 4 * pmc);
 			mmcr1 |= (unsigned long) combine
 				<< (MMCR1_PMC1_COMBINE_SH - pmc);
 			mmcr1 |= psel << MMCR1_PMCSEL_SH(pmc);
 			if (unit == 6)	/* L2 events */
 				mmcr1 |= (unsigned long) l2sel
 					<< MMCR1_L2SEL_SH;
 		}
 		if (power7_marked_instr_event(event[i]))
 			mmcra |= MMCRA_SAMPLE_ENABLE;
 		hwc[i] = pmc;
 	}

 	/* Return MMCRx values */
 	mmcr[0] = 0;
 	if (pmc_inuse & 1)
 		mmcr[0] = MMCR0_PMC1CE;
 	if (pmc_inuse & 0x3e)
 		mmcr[0] |= MMCR0_PMCjCE;
 	mmcr[1] = mmcr1;
 	mmcr[2] = mmcra;
 	return 0;
 }

 static void power7_disable_pmc(unsigned int pmc, unsigned long mmcr[])
 {
 	if (pmc <= 3)
 		mmcr[1] &= ~(0xffUL << MMCR1_PMCSEL_SH(pmc));
 }

 static int power7_generic_events[] = {
 	[PERF_COUNT_HW_CPU_CYCLES] =			PME_PM_CYC,
 	[PERF_COUNT_HW_STALLED_CYCLES_FRONTEND] =	PME_PM_GCT_NOSLOT_CYC,
 	[PERF_COUNT_HW_STALLED_CYCLES_BACKEND] =	PME_PM_CMPLU_STALL,
 	[PERF_COUNT_HW_INSTRUCTIONS] =			PME_PM_INST_CMPL,
 	[PERF_COUNT_HW_CACHE_REFERENCES] =		PME_PM_LD_REF_L1,
 	[PERF_COUNT_HW_CACHE_MISSES] =			PME_PM_LD_MISS_L1,
 	[PERF_COUNT_HW_BRANCH_INSTRUCTIONS] =		PME_PM_BRU_FIN,
 	[PERF_COUNT_HW_BRANCH_MISSES] =			PME_PM_BR_MPRED,
 };

 #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 power7_cache_events[C(MAX)][C(OP_MAX)][C(RESULT_MAX)] = {
 	[C(L1D)] = {		/* 	RESULT_ACCESS	RESULT_MISS */
 		[C(OP_READ)] = {	0xc880,		0x400f0	},
 		[C(OP_WRITE)] = {	0,		0x300f0	},
 		[C(OP_PREFETCH)] = {	0xd8b8,		0	},
 	},
 	[C(L1I)] = {		/* 	RESULT_ACCESS	RESULT_MISS */
 		[C(OP_READ)] = {	0,		0x200fc	},
 		[C(OP_WRITE)] = {	-1,		-1	},
 		[C(OP_PREFETCH)] = {	0x408a,		0	},
 	},
 	[C(LL)] = {		/* 	RESULT_ACCESS	RESULT_MISS */
 		[C(OP_READ)] = {	0x16080,	0x26080	},
 		[C(OP_WRITE)] = {	0x16082,	0x26082	},
 		[C(OP_PREFETCH)] = {	0,		0	},
 	},
 	[C(DTLB)] = {		/* 	RESULT_ACCESS	RESULT_MISS */
 		[C(OP_READ)] = {	0,		0x300fc	},
 		[C(OP_WRITE)] = {	-1,		-1	},
 		[C(OP_PREFETCH)] = {	-1,		-1	},
 	},
 	[C(ITLB)] = {		/* 	RESULT_ACCESS	RESULT_MISS */
 		[C(OP_READ)] = {	0,		0x400fc	},
 		[C(OP_WRITE)] = {	-1,		-1	},
 		[C(OP_PREFETCH)] = {	-1,		-1	},
 	},
 	[C(BPU)] = {		/* 	RESULT_ACCESS	RESULT_MISS */
 		[C(OP_READ)] = {	0x10068,	0x400f6	},
 		[C(OP_WRITE)] = {	-1,		-1	},
 		[C(OP_PREFETCH)] = {	-1,		-1	},
 	},
 	[C(NODE)] = {		/* 	RESULT_ACCESS	RESULT_MISS */
 		[C(OP_READ)] = {	-1,		-1	},
 		[C(OP_WRITE)] = {	-1,		-1	},
 		[C(OP_PREFETCH)] = {	-1,		-1	},
 	},
 };


 GENERIC_EVENT_ATTR(cpu-cycles,			PM_CYC);
 GENERIC_EVENT_ATTR(stalled-cycles-frontend,	PM_GCT_NOSLOT_CYC);
 GENERIC_EVENT_ATTR(stalled-cycles-backend,	PM_CMPLU_STALL);
 GENERIC_EVENT_ATTR(instructions,		PM_INST_CMPL);
 GENERIC_EVENT_ATTR(cache-references,		PM_LD_REF_L1);
 GENERIC_EVENT_ATTR(cache-misses,		PM_LD_MISS_L1);
 GENERIC_EVENT_ATTR(branch-instructions,		PM_BRU_FIN);
 GENERIC_EVENT_ATTR(branch-misses,		PM_BR_MPRED);

 #define EVENT(_name, _code)     POWER_EVENT_ATTR(_name, _name);
 #include "power7-events-list.h"
 #undef EVENT

 #define EVENT(_name, _code)     POWER_EVENT_PTR(_name),

 static struct attribute *power7_events_attr[] = {
 	GENERIC_EVENT_PTR(PM_CYC),
 	GENERIC_EVENT_PTR(PM_GCT_NOSLOT_CYC),
 	GENERIC_EVENT_PTR(PM_CMPLU_STALL),
 	GENERIC_EVENT_PTR(PM_INST_CMPL),
 	GENERIC_EVENT_PTR(PM_LD_REF_L1),
 	GENERIC_EVENT_PTR(PM_LD_MISS_L1),
 	GENERIC_EVENT_PTR(PM_BRU_FIN),
 	GENERIC_EVENT_PTR(PM_BR_MPRED),

 	#include "power7-events-list.h"
 	#undef EVENT
 	NULL
 };

 static struct attribute_group power7_pmu_events_group = {
 	.name = "events",
 	.attrs = power7_events_attr,
 };

 PMU_FORMAT_ATTR(event, "config:0-19");

 static struct attribute *power7_pmu_format_attr[] = {
 	&format_attr_event.attr,
 	NULL,
 };

 struct attribute_group power7_pmu_format_group = {
 	.name = "format",
 	.attrs = power7_pmu_format_attr,
 };

 static const struct attribute_group *power7_pmu_attr_groups[] = {
 	&power7_pmu_format_group,
 	&power7_pmu_events_group,
 	NULL,
 };

 static struct power_pmu power7_pmu = {
 	.name			= "POWER7",
 	.n_counter		= 6,
 	.max_alternatives	= MAX_ALT + 1,
 	.add_fields		= 0x1555ul,
 	.test_adder		= 0x3000ul,
 	.compute_mmcr		= power7_compute_mmcr,
 	.get_constraint		= power7_get_constraint,
 	.get_alternatives	= power7_get_alternatives,
 	.disable_pmc		= power7_disable_pmc,
 	.flags			= PPMU_ALT_SIPR,
 	.attr_groups		= power7_pmu_attr_groups,
 	.n_generic		= ARRAY_SIZE(power7_generic_events),
 	.generic_events		= power7_generic_events,
 	.cache_events		= &power7_cache_events,
 };

 static int __init init_power7_pmu(void)
 {
 	if (!cur_cpu_spec->oprofile_cpu_type ||
 	    strcmp(cur_cpu_spec->oprofile_cpu_type, "ppc64/power7"))
 		return -ENODEV;

 	if (pvr_version_is(PVR_POWER7p))
 		power7_pmu.flags |= PPMU_SIAR_VALID;

 	return register_power_pmu(&power7_pmu);
 }

 early_initcall(init_power7_pmu);
	/*
	* Performance counter support for POWER7 processors.
	*
	* Copyright 2009 Paul Mackerras, 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 (at your option) any later version.
	*/
	#include <linux/kernel.h>
	#include <linux/perf_event.h>
	#include <linux/string.h>
	#include <asm/reg.h>
	#include <asm/cputable.h>

	/*
	* Bits in event code for POWER7
	*/
	#define PM_PMC_SH 16 /* PMC number (1-based) for direct events */
	#define PM_PMC_MSK 0xf
	#define PM_PMC_MSKS (PM_PMC_MSK << PM_PMC_SH)
	#define PM_UNIT_SH 12 /* TTMMUX number and setting - unit select */
	#define PM_UNIT_MSK 0xf
	#define PM_COMBINE_SH 11 /* Combined event bit */
	#define PM_COMBINE_MSK 1
	#define PM_COMBINE_MSKS 0x800
	#define PM_L2SEL_SH 8 /* L2 event select */
	#define PM_L2SEL_MSK 7
	#define PM_PMCSEL_MSK 0xff

	/*
	* Bits in MMCR1 for POWER7
	*/
	#define MMCR1_TTM0SEL_SH 60
	#define MMCR1_TTM1SEL_SH 56
	#define MMCR1_TTM2SEL_SH 52
	#define MMCR1_TTM3SEL_SH 48
	#define MMCR1_TTMSEL_MSK 0xf
	#define MMCR1_L2SEL_SH 45
	#define MMCR1_L2SEL_MSK 7
	#define MMCR1_PMC1_COMBINE_SH 35
	#define MMCR1_PMC2_COMBINE_SH 34
	#define MMCR1_PMC3_COMBINE_SH 33
	#define MMCR1_PMC4_COMBINE_SH 32
	#define MMCR1_PMC1SEL_SH 24
	#define MMCR1_PMC2SEL_SH 16
	#define MMCR1_PMC3SEL_SH 8
	#define MMCR1_PMC4SEL_SH 0
	#define MMCR1_PMCSEL_SH(n) (MMCR1_PMC1SEL_SH - (n) * 8)
	#define MMCR1_PMCSEL_MSK 0xff

	/*
	* Power7 event codes.
	*/
	#define EVENT(_name, _code) \
	PME_##_name = _code,

	enum {
	#include "power7-events-list.h"
	};
	#undef EVENT

	/*
	* Layout of constraint bits:
	* 6666555555555544444444443333333333222222222211111111110000000000
	* 3210987654321098765432109876543210987654321098765432109876543210
	* < >< ><><><><><><>
	* L2 NC P6P5P4P3P2P1
	*
	* L2 - 16-18 - Required L2SEL value (select field)
	*
	* NC - number of counters
	* 15: NC error 0x8000
	* 12-14: number of events needing PMC1-4 0x7000
	*
	* P6
	* 11: P6 error 0x800
	* 10-11: Count of events needing PMC6
	*
	* P1..P5
	* 0-9: Count of events needing PMC1..PMC5
	*/

	static int power7_get_constraint(u64 event, unsigned long *maskp,
	unsigned long *valp)
	{
	int pmc, sh, unit;
	unsigned long mask = 0, value = 0;

	pmc = (event >> PM_PMC_SH) & PM_PMC_MSK;
	if (pmc) {
	if (pmc > 6)
	return -1;
	sh = (pmc - 1) * 2;
	mask \|= 2 << sh;
	value \|= 1 << sh;
	if (pmc >= 5 && !(event == 0x500fa \|\| event == 0x600f4))
	return -1;
	}
	if (pmc < 5) {
	/* need a counter from PMC1-4 set */
	mask \|= 0x8000;
	value \|= 0x1000;
	}

	unit = (event >> PM_UNIT_SH) & PM_UNIT_MSK;
	if (unit == 6) {
	/* L2SEL must be identical across events */
	int l2sel = (event >> PM_L2SEL_SH) & PM_L2SEL_MSK;
	mask \|= 0x7 << 16;
	value \|= l2sel << 16;
	}

	*maskp = mask;
	*valp = value;
	return 0;
	}

	#define MAX_ALT 2 /* at most 2 alternatives for any event */

	static const unsigned int event_alternatives[][MAX_ALT] = {
	{ 0x200f2, 0x300f2 }, /* PM_INST_DISP */
	{ 0x200f4, 0x600f4 }, /* PM_RUN_CYC */
	{ 0x400fa, 0x500fa }, /* PM_RUN_INST_CMPL */
	};

	/*
	* Scan the alternatives table for a match and return the
	* index into the alternatives table if found, else -1.
	*/
	static int find_alternative(u64 event)
	{
	int i, j;

	for (i = 0; i < ARRAY_SIZE(event_alternatives); ++i) {
	if (event < event_alternatives[i][0])
	break;
	for (j = 0; j < MAX_ALT && event_alternatives[i][j]; ++j)
	if (event == event_alternatives[i][j])
	return i;
	}
	return -1;
	}

	static s64 find_alternative_decode(u64 event)
	{
	int pmc, psel;

	/* this only handles the 4x decode events */
	pmc = (event >> PM_PMC_SH) & PM_PMC_MSK;
	psel = event & PM_PMCSEL_MSK;
	if ((pmc == 2 \|\| pmc == 4) && (psel & ~7) == 0x40)
	return event - (1 << PM_PMC_SH) + 8;
	if ((pmc == 1 \|\| pmc == 3) && (psel & ~7) == 0x48)
	return event + (1 << PM_PMC_SH) - 8;
	return -1;
	}

	static int power7_get_alternatives(u64 event, unsigned int flags, u64 alt[])
	{
	int i, j, nalt = 1;
	s64 ae;

	alt[0] = event;
	nalt = 1;
	i = find_alternative(event);
	if (i >= 0) {
	for (j = 0; j < MAX_ALT; ++j) {
	ae = event_alternatives[i][j];
	if (ae && ae != event)
	alt[nalt++] = ae;
	}
	} else {
	ae = find_alternative_decode(event);
	if (ae > 0)
	alt[nalt++] = ae;
	}

	if (flags & PPMU_ONLY_COUNT_RUN) {
	/*
	* We're only counting in RUN state,
	* so PM_CYC is equivalent to PM_RUN_CYC
	* and PM_INST_CMPL === PM_RUN_INST_CMPL.
	* This doesn't include alternatives that don't provide
	* any extra flexibility in assigning PMCs.
	*/
	j = nalt;
	for (i = 0; i < nalt; ++i) {
	switch (alt[i]) {
	case 0x1e: /* PM_CYC */
	alt[j++] = 0x600f4; /* PM_RUN_CYC */
	break;
	case 0x600f4: /* PM_RUN_CYC */
	alt[j++] = 0x1e;
	break;
	case 0x2: /* PM_PPC_CMPL */
	alt[j++] = 0x500fa; /* PM_RUN_INST_CMPL */
	break;
	case 0x500fa: /* PM_RUN_INST_CMPL */
	alt[j++] = 0x2; /* PM_PPC_CMPL */
	break;
	}
	}
	nalt = j;
	}

	return nalt;
	}

	/*
	* Returns 1 if event counts things relating to marked instructions
	* and thus needs the MMCRA_SAMPLE_ENABLE bit set, or 0 if not.
	*/
	static int power7_marked_instr_event(u64 event)
	{
	int pmc, psel;
	int unit;

	pmc = (event >> PM_PMC_SH) & PM_PMC_MSK;
	unit = (event >> PM_UNIT_SH) & PM_UNIT_MSK;
	psel = event & PM_PMCSEL_MSK & ~1; /* trim off edge/level bit */
	if (pmc >= 5)
	return 0;

	switch (psel >> 4) {
	case 2:
	return pmc == 2 \|\| pmc == 4;
	case 3:
	if (psel == 0x3c)
	return pmc == 1;
	if (psel == 0x3e)
	return pmc != 2;
	return 1;
	case 4:
	case 5:
	return unit == 0xd;
	case 6:
	if (psel == 0x64)
	return pmc >= 3;
	case 8:
	return unit == 0xd;
	}
	return 0;
	}

	static int power7_compute_mmcr(u64 event[], int n_ev,
	unsigned int hwc[], unsigned long mmcr[])
	{
	unsigned long mmcr1 = 0;
	unsigned long mmcra = MMCRA_SDAR_DCACHE_MISS \| MMCRA_SDAR_ERAT_MISS;
	unsigned int pmc, unit, combine, l2sel, psel;
	unsigned int pmc_inuse = 0;
	int i;

	/* First pass to count resource use */
	for (i = 0; i < n_ev; ++i) {
	pmc = (event[i] >> PM_PMC_SH) & PM_PMC_MSK;
	if (pmc) {
	if (pmc > 6)
	return -1;
	if (pmc_inuse & (1 << (pmc - 1)))
	return -1;
	pmc_inuse \|= 1 << (pmc - 1);
	}
	}

	/* Second pass: assign PMCs, set all MMCR1 fields */
	for (i = 0; i < n_ev; ++i) {
	pmc = (event[i] >> PM_PMC_SH) & PM_PMC_MSK;
	unit = (event[i] >> PM_UNIT_SH) & PM_UNIT_MSK;
	combine = (event[i] >> PM_COMBINE_SH) & PM_COMBINE_MSK;
	l2sel = (event[i] >> PM_L2SEL_SH) & PM_L2SEL_MSK;
	psel = event[i] & PM_PMCSEL_MSK;
	if (!pmc) {
	/* Bus event or any-PMC direct event */
	for (pmc = 0; pmc < 4; ++pmc) {
	if (!(pmc_inuse & (1 << pmc)))
	break;
	}
	if (pmc >= 4)
	return -1;
	pmc_inuse \|= 1 << pmc;
	} else {
	/* Direct or decoded event */
	--pmc;
	}
	if (pmc <= 3) {
	mmcr1 \|= (unsigned long) unit
	<< (MMCR1_TTM0SEL_SH - 4 * pmc);
	mmcr1 \|= (unsigned long) combine
	<< (MMCR1_PMC1_COMBINE_SH - pmc);
	mmcr1 \|= psel << MMCR1_PMCSEL_SH(pmc);
	if (unit == 6) /* L2 events */
	mmcr1 \|= (unsigned long) l2sel
	<< MMCR1_L2SEL_SH;
	}
	if (power7_marked_instr_event(event[i]))
	mmcra \|= MMCRA_SAMPLE_ENABLE;
	hwc[i] = pmc;
	}

	/* Return MMCRx values */
	mmcr[0] = 0;
	if (pmc_inuse & 1)
	mmcr[0] = MMCR0_PMC1CE;
	if (pmc_inuse & 0x3e)
	mmcr[0] \|= MMCR0_PMCjCE;
	mmcr[1] = mmcr1;
	mmcr[2] = mmcra;
	return 0;
	}

	static void power7_disable_pmc(unsigned int pmc, unsigned long mmcr[])
	{
	if (pmc <= 3)
	mmcr[1] &= ~(0xffUL << MMCR1_PMCSEL_SH(pmc));
	}

	static int power7_generic_events[] = {
	[PERF_COUNT_HW_CPU_CYCLES] = PME_PM_CYC,
	[PERF_COUNT_HW_STALLED_CYCLES_FRONTEND] = PME_PM_GCT_NOSLOT_CYC,
	[PERF_COUNT_HW_STALLED_CYCLES_BACKEND] = PME_PM_CMPLU_STALL,
	[PERF_COUNT_HW_INSTRUCTIONS] = PME_PM_INST_CMPL,
	[PERF_COUNT_HW_CACHE_REFERENCES] = PME_PM_LD_REF_L1,
	[PERF_COUNT_HW_CACHE_MISSES] = PME_PM_LD_MISS_L1,
	[PERF_COUNT_HW_BRANCH_INSTRUCTIONS] = PME_PM_BRU_FIN,
	[PERF_COUNT_HW_BRANCH_MISSES] = PME_PM_BR_MPRED,
	};

	#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 power7_cache_events[C(MAX)][C(OP_MAX)][C(RESULT_MAX)] = {
	[C(L1D)] = { /* RESULT_ACCESS RESULT_MISS */
	[C(OP_READ)] = { 0xc880, 0x400f0 },
	[C(OP_WRITE)] = { 0, 0x300f0 },
	[C(OP_PREFETCH)] = { 0xd8b8, 0 },
	},
	[C(L1I)] = { /* RESULT_ACCESS RESULT_MISS */
	[C(OP_READ)] = { 0, 0x200fc },
	[C(OP_WRITE)] = { -1, -1 },
	[C(OP_PREFETCH)] = { 0x408a, 0 },
	},
	[C(LL)] = { /* RESULT_ACCESS RESULT_MISS */
	[C(OP_READ)] = { 0x16080, 0x26080 },
	[C(OP_WRITE)] = { 0x16082, 0x26082 },
	[C(OP_PREFETCH)] = { 0, 0 },
	},
	[C(DTLB)] = { /* RESULT_ACCESS RESULT_MISS */
	[C(OP_READ)] = { 0, 0x300fc },
	[C(OP_WRITE)] = { -1, -1 },
	[C(OP_PREFETCH)] = { -1, -1 },
	},
	[C(ITLB)] = { /* RESULT_ACCESS RESULT_MISS */
	[C(OP_READ)] = { 0, 0x400fc },
	[C(OP_WRITE)] = { -1, -1 },
	[C(OP_PREFETCH)] = { -1, -1 },
	},
	[C(BPU)] = { /* RESULT_ACCESS RESULT_MISS */
	[C(OP_READ)] = { 0x10068, 0x400f6 },
	[C(OP_WRITE)] = { -1, -1 },
	[C(OP_PREFETCH)] = { -1, -1 },
	},
	[C(NODE)] = { /* RESULT_ACCESS RESULT_MISS */
	[C(OP_READ)] = { -1, -1 },
	[C(OP_WRITE)] = { -1, -1 },
	[C(OP_PREFETCH)] = { -1, -1 },
	},
	};


	GENERIC_EVENT_ATTR(cpu-cycles, PM_CYC);
	GENERIC_EVENT_ATTR(stalled-cycles-frontend, PM_GCT_NOSLOT_CYC);
	GENERIC_EVENT_ATTR(stalled-cycles-backend, PM_CMPLU_STALL);
	GENERIC_EVENT_ATTR(instructions, PM_INST_CMPL);
	GENERIC_EVENT_ATTR(cache-references, PM_LD_REF_L1);
	GENERIC_EVENT_ATTR(cache-misses, PM_LD_MISS_L1);
	GENERIC_EVENT_ATTR(branch-instructions, PM_BRU_FIN);
	GENERIC_EVENT_ATTR(branch-misses, PM_BR_MPRED);

	#define EVENT(_name, _code) POWER_EVENT_ATTR(_name, _name);
	#include "power7-events-list.h"
	#undef EVENT

	#define EVENT(_name, _code) POWER_EVENT_PTR(_name),

	static struct attribute *power7_events_attr[] = {
	GENERIC_EVENT_PTR(PM_CYC),
	GENERIC_EVENT_PTR(PM_GCT_NOSLOT_CYC),
	GENERIC_EVENT_PTR(PM_CMPLU_STALL),
	GENERIC_EVENT_PTR(PM_INST_CMPL),
	GENERIC_EVENT_PTR(PM_LD_REF_L1),
	GENERIC_EVENT_PTR(PM_LD_MISS_L1),
	GENERIC_EVENT_PTR(PM_BRU_FIN),
	GENERIC_EVENT_PTR(PM_BR_MPRED),

	#include "power7-events-list.h"
	#undef EVENT
	NULL
	};

	static struct attribute_group power7_pmu_events_group = {
	.name = "events",
	.attrs = power7_events_attr,
	};

	PMU_FORMAT_ATTR(event, "config:0-19");

	static struct attribute *power7_pmu_format_attr[] = {
	&format_attr_event.attr,
	NULL,
	};

	struct attribute_group power7_pmu_format_group = {
	.name = "format",
	.attrs = power7_pmu_format_attr,
	};

	static const struct attribute_group *power7_pmu_attr_groups[] = {
	&power7_pmu_format_group,
	&power7_pmu_events_group,
	NULL,
	};

	static struct power_pmu power7_pmu = {
	.name = "POWER7",
	.n_counter = 6,
	.max_alternatives = MAX_ALT + 1,
	.add_fields = 0x1555ul,
	.test_adder = 0x3000ul,
	.compute_mmcr = power7_compute_mmcr,
	.get_constraint = power7_get_constraint,
	.get_alternatives = power7_get_alternatives,
	.disable_pmc = power7_disable_pmc,
	.flags = PPMU_ALT_SIPR,
	.attr_groups = power7_pmu_attr_groups,
	.n_generic = ARRAY_SIZE(power7_generic_events),
	.generic_events = power7_generic_events,
	.cache_events = &power7_cache_events,
	};

	static int __init init_power7_pmu(void)
	{
	if (!cur_cpu_spec->oprofile_cpu_type \|\|
	strcmp(cur_cpu_spec->oprofile_cpu_type, "ppc64/power7"))
	return -ENODEV;

	if (pvr_version_is(PVR_POWER7p))
	power7_pmu.flags \|= PPMU_SIAR_VALID;

	return register_power_pmu(&power7_pmu);
	}

	early_initcall(init_power7_pmu);