/*
* 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_counter.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
/*
* Bits in MMCRA
*/
/*
* Layout of constraint bits:
* 6666555555555544444444443333333333222222222211111111110000000000
* 3210987654321098765432109876543210987654321098765432109876543210
* [ ><><><><><><>
* NC P6P5P4P3P2P1
*
* 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;
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;
}
*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 = 0;
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] = 0x1e,
[PERF_COUNT_HW_INSTRUCTIONS] = 2,
[PERF_COUNT_HW_CACHE_REFERENCES] = 0xc880, /* LD_REF_L1_LSU*/
[PERF_COUNT_HW_CACHE_MISSES] = 0x400f0, /* LD_MISS_L1 */
[PERF_COUNT_HW_BRANCH_INSTRUCTIONS] = 0x10068, /* BRU_FIN */
[PERF_COUNT_HW_BRANCH_MISSES] = 0x400f6, /* 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)] = { 0x400f0, 0xc880 },
[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)] = { 0x6080, 0x6084 },
[C(OP_WRITE)] = { 0x6082, 0x6086 },
[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 },
},
};
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,
.n_generic = ARRAY_SIZE(power7_generic_events),
.generic_events = power7_generic_events,
.cache_events = &power7_cache_events,
};
static int init_power7_pmu(void)
{
if (strcmp(cur_cpu_spec->oprofile_cpu_type, "ppc64/power7"))
return -ENODEV;
return register_power_pmu(&power7_pmu);
}
arch_initcall(init_power7_pmu);
