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linux/arch/powerpc/perf/ppc970-pmu.c
Benjamin Herrenschmidt 1ce447b90f powerpc/perf: Fix instruction address sampling on 970 and Power4 
970 and Power4 don't support "continuous sampling" which means that
when we aren't in marked instruction sampling mode (marked events),
SIAR isn't updated with the last instruction sampled before the
perf interrupt. On those processors, we must thus use the exception
SRR0 value as the sampled instruction pointer.

Those processors also don't support the SIPR and SIHV bits in MMCRA
which means we need some kind of heuristic to decide if SIAR values
represent kernel or user addresses.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2012-03-28 11:33:24 +11:00

504 lines
13 KiB
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/*
* Performance counter support for PPC970-family processors.
*
* Copyright 2008-2009 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/string.h>
#include <linux/perf_event.h>
#include <asm/reg.h>
#include <asm/cputable.h>
/*
* Bits in event code for PPC970
*/
#define PM_PMC_SH 12 /* PMC number (1-based) for direct events */
#define PM_PMC_MSK 0xf
#define PM_UNIT_SH 8 /* TTMMUX number and setting - unit select */
#define PM_UNIT_MSK 0xf
#define PM_SPCSEL_SH 6
#define PM_SPCSEL_MSK 3
#define PM_BYTE_SH 4 /* Byte number of event bus to use */
#define PM_BYTE_MSK 3
#define PM_PMCSEL_MSK 0xf
/* Values in PM_UNIT field */
#define PM_NONE 0
#define PM_FPU 1
#define PM_VPU 2
#define PM_ISU 3
#define PM_IFU 4
#define PM_IDU 5
#define PM_STS 6
#define PM_LSU0 7
#define PM_LSU1U 8
#define PM_LSU1L 9
#define PM_LASTUNIT 9
/*
* Bits in MMCR0 for PPC970
*/
#define MMCR0_PMC1SEL_SH 8
#define MMCR0_PMC2SEL_SH 1
#define MMCR_PMCSEL_MSK 0x1f
/*
* Bits in MMCR1 for PPC970
*/
#define MMCR1_TTM0SEL_SH 62
#define MMCR1_TTM1SEL_SH 59
#define MMCR1_TTM3SEL_SH 53
#define MMCR1_TTMSEL_MSK 3
#define MMCR1_TD_CP_DBG0SEL_SH 50
#define MMCR1_TD_CP_DBG1SEL_SH 48
#define MMCR1_TD_CP_DBG2SEL_SH 46
#define MMCR1_TD_CP_DBG3SEL_SH 44
#define MMCR1_PMC1_ADDER_SEL_SH 39
#define MMCR1_PMC2_ADDER_SEL_SH 38
#define MMCR1_PMC6_ADDER_SEL_SH 37
#define MMCR1_PMC5_ADDER_SEL_SH 36
#define MMCR1_PMC8_ADDER_SEL_SH 35
#define MMCR1_PMC7_ADDER_SEL_SH 34
#define MMCR1_PMC3_ADDER_SEL_SH 33
#define MMCR1_PMC4_ADDER_SEL_SH 32
#define MMCR1_PMC3SEL_SH 27
#define MMCR1_PMC4SEL_SH 22
#define MMCR1_PMC5SEL_SH 17
#define MMCR1_PMC6SEL_SH 12
#define MMCR1_PMC7SEL_SH 7
#define MMCR1_PMC8SEL_SH 2
static short mmcr1_adder_bits[8] = {
MMCR1_PMC1_ADDER_SEL_SH,
MMCR1_PMC2_ADDER_SEL_SH,
MMCR1_PMC3_ADDER_SEL_SH,
MMCR1_PMC4_ADDER_SEL_SH,
MMCR1_PMC5_ADDER_SEL_SH,
MMCR1_PMC6_ADDER_SEL_SH,
MMCR1_PMC7_ADDER_SEL_SH,
MMCR1_PMC8_ADDER_SEL_SH
};
/*
* Layout of constraint bits:
* 6666555555555544444444443333333333222222222211111111110000000000
* 3210987654321098765432109876543210987654321098765432109876543210
* <><><>[ >[ >[ >< >< >< >< ><><><><><><><><>
* SPT0T1 UC PS1 PS2 B0 B1 B2 B3 P1P2P3P4P5P6P7P8
*
* SP - SPCSEL constraint
* 48-49: SPCSEL value 0x3_0000_0000_0000
*
* T0 - TTM0 constraint
* 46-47: TTM0SEL value (0=FPU, 2=IFU, 3=VPU) 0xC000_0000_0000
*
* T1 - TTM1 constraint
* 44-45: TTM1SEL value (0=IDU, 3=STS) 0x3000_0000_0000
*
* UC - unit constraint: can't have all three of FPU|IFU|VPU, ISU, IDU|STS
* 43: UC3 error 0x0800_0000_0000
* 42: FPU|IFU|VPU events needed 0x0400_0000_0000
* 41: ISU events needed 0x0200_0000_0000
* 40: IDU|STS events needed 0x0100_0000_0000
*
* PS1
* 39: PS1 error 0x0080_0000_0000
* 36-38: count of events needing PMC1/2/5/6 0x0070_0000_0000
*
* PS2
* 35: PS2 error 0x0008_0000_0000
* 32-34: count of events needing PMC3/4/7/8 0x0007_0000_0000
*
* B0
* 28-31: Byte 0 event source 0xf000_0000
* Encoding as for the event code
*
* B1, B2, B3
* 24-27, 20-23, 16-19: Byte 1, 2, 3 event sources
*
* P1
* 15: P1 error 0x8000
* 14-15: Count of events needing PMC1
*
* P2..P8
* 0-13: Count of events needing PMC2..PMC8
*/
static unsigned char direct_marked_event[8] = {
(1<<2) | (1<<3), /* PMC1: PM_MRK_GRP_DISP, PM_MRK_ST_CMPL */
(1<<3) | (1<<5), /* PMC2: PM_THRESH_TIMEO, PM_MRK_BRU_FIN */
(1<<3) | (1<<5), /* PMC3: PM_MRK_ST_CMPL_INT, PM_MRK_VMX_FIN */
(1<<4) | (1<<5), /* PMC4: PM_MRK_GRP_CMPL, PM_MRK_CRU_FIN */
(1<<4) | (1<<5), /* PMC5: PM_GRP_MRK, PM_MRK_GRP_TIMEO */
(1<<3) | (1<<4) | (1<<5),
/* PMC6: PM_MRK_ST_STS, PM_MRK_FXU_FIN, PM_MRK_GRP_ISSUED */
(1<<4) | (1<<5), /* PMC7: PM_MRK_FPU_FIN, PM_MRK_INST_FIN */
(1<<4) /* PMC8: PM_MRK_LSU_FIN */
};
/*
* 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 p970_marked_instr_event(u64 event)
{
int pmc, psel, unit, byte, bit;
unsigned int mask;
pmc = (event >> PM_PMC_SH) & PM_PMC_MSK;
psel = event & PM_PMCSEL_MSK;
if (pmc) {
if (direct_marked_event[pmc - 1] & (1 << psel))
return 1;
if (psel == 0) /* add events */
bit = (pmc <= 4)? pmc - 1: 8 - pmc;
else if (psel == 7 || psel == 13) /* decode events */
bit = 4;
else
return 0;
} else
bit = psel;
byte = (event >> PM_BYTE_SH) & PM_BYTE_MSK;
unit = (event >> PM_UNIT_SH) & PM_UNIT_MSK;
mask = 0;
switch (unit) {
case PM_VPU:
mask = 0x4c; /* byte 0 bits 2,3,6 */
break;
case PM_LSU0:
/* byte 2 bits 0,2,3,4,6; all of byte 1 */
mask = 0x085dff00;
break;
case PM_LSU1L:
mask = 0x50 << 24; /* byte 3 bits 4,6 */
break;
}
return (mask >> (byte * 8 + bit)) & 1;
}
/* Masks and values for using events from the various units */
static unsigned long unit_cons[PM_LASTUNIT+1][2] = {
[PM_FPU] = { 0xc80000000000ull, 0x040000000000ull },
[PM_VPU] = { 0xc80000000000ull, 0xc40000000000ull },
[PM_ISU] = { 0x080000000000ull, 0x020000000000ull },
[PM_IFU] = { 0xc80000000000ull, 0x840000000000ull },
[PM_IDU] = { 0x380000000000ull, 0x010000000000ull },
[PM_STS] = { 0x380000000000ull, 0x310000000000ull },
};
static int p970_get_constraint(u64 event, unsigned long *maskp,
unsigned long *valp)
{
int pmc, byte, unit, sh, spcsel;
unsigned long mask = 0, value = 0;
int grp = -1;
pmc = (event >> PM_PMC_SH) & PM_PMC_MSK;
if (pmc) {
if (pmc > 8)
return -1;
sh = (pmc - 1) * 2;
mask |= 2 << sh;
value |= 1 << sh;
grp = ((pmc - 1) >> 1) & 1;
}
unit = (event >> PM_UNIT_SH) & PM_UNIT_MSK;
if (unit) {
if (unit > PM_LASTUNIT)
return -1;
mask |= unit_cons[unit][0];
value |= unit_cons[unit][1];
byte = (event >> PM_BYTE_SH) & PM_BYTE_MSK;
/*
* Bus events on bytes 0 and 2 can be counted
* on PMC1/2/5/6; bytes 1 and 3 on PMC3/4/7/8.
*/
if (!pmc)
grp = byte & 1;
/* Set byte lane select field */
mask |= 0xfULL << (28 - 4 * byte);
value |= (unsigned long)unit << (28 - 4 * byte);
}
if (grp == 0) {
/* increment PMC1/2/5/6 field */
mask |= 0x8000000000ull;
value |= 0x1000000000ull;
} else if (grp == 1) {
/* increment PMC3/4/7/8 field */
mask |= 0x800000000ull;
value |= 0x100000000ull;
}
spcsel = (event >> PM_SPCSEL_SH) & PM_SPCSEL_MSK;
if (spcsel) {
mask |= 3ull << 48;
value |= (unsigned long)spcsel << 48;
}
*maskp = mask;
*valp = value;
return 0;
}
static int p970_get_alternatives(u64 event, unsigned int flags, u64 alt[])
{
alt[0] = event;
/* 2 alternatives for LSU empty */
if (event == 0x2002 || event == 0x3002) {
alt[1] = event ^ 0x1000;
return 2;
}
return 1;
}
static int p970_compute_mmcr(u64 event[], int n_ev,
unsigned int hwc[], unsigned long mmcr[])
{
unsigned long mmcr0 = 0, mmcr1 = 0, mmcra = 0;
unsigned int pmc, unit, byte, psel;
unsigned int ttm, grp;
unsigned int pmc_inuse = 0;
unsigned int pmc_grp_use[2];
unsigned char busbyte[4];
unsigned char unituse[16];
unsigned char unitmap[] = { 0, 0<<3, 3<<3, 1<<3, 2<<3, 0|4, 3|4 };
unsigned char ttmuse[2];
unsigned char pmcsel[8];
int i;
int spcsel;
if (n_ev > 8)
return -1;
/* First pass to count resource use */
pmc_grp_use[0] = pmc_grp_use[1] = 0;
memset(busbyte, 0, sizeof(busbyte));
memset(unituse, 0, sizeof(unituse));
for (i = 0; i < n_ev; ++i) {
pmc = (event[i] >> PM_PMC_SH) & PM_PMC_MSK;
if (pmc) {
if (pmc_inuse & (1 << (pmc - 1)))
return -1;
pmc_inuse |= 1 << (pmc - 1);
/* count 1/2/5/6 vs 3/4/7/8 use */
++pmc_grp_use[((pmc - 1) >> 1) & 1];
}
unit = (event[i] >> PM_UNIT_SH) & PM_UNIT_MSK;
byte = (event[i] >> PM_BYTE_SH) & PM_BYTE_MSK;
if (unit) {
if (unit > PM_LASTUNIT)
return -1;
if (!pmc)
++pmc_grp_use[byte & 1];
if (busbyte[byte] && busbyte[byte] != unit)
return -1;
busbyte[byte] = unit;
unituse[unit] = 1;
}
}
if (pmc_grp_use[0] > 4 || pmc_grp_use[1] > 4)
return -1;
/*
* Assign resources and set multiplexer selects.
*
* PM_ISU can go either on TTM0 or TTM1, but that's the only
* choice we have to deal with.
*/
if (unituse[PM_ISU] &
(unituse[PM_FPU] | unituse[PM_IFU] | unituse[PM_VPU]))
unitmap[PM_ISU] = 2 | 4; /* move ISU to TTM1 */
/* Set TTM[01]SEL fields. */
ttmuse[0] = ttmuse[1] = 0;
for (i = PM_FPU; i <= PM_STS; ++i) {
if (!unituse[i])
continue;
ttm = unitmap[i];
++ttmuse[(ttm >> 2) & 1];
mmcr1 |= (unsigned long)(ttm & ~4) << MMCR1_TTM1SEL_SH;
}
/* Check only one unit per TTMx */
if (ttmuse[0] > 1 || ttmuse[1] > 1)
return -1;
/* Set byte lane select fields and TTM3SEL. */
for (byte = 0; byte < 4; ++byte) {
unit = busbyte[byte];
if (!unit)
continue;
if (unit <= PM_STS)
ttm = (unitmap[unit] >> 2) & 1;
else if (unit == PM_LSU0)
ttm = 2;
else {
ttm = 3;
if (unit == PM_LSU1L && byte >= 2)
mmcr1 |= 1ull << (MMCR1_TTM3SEL_SH + 3 - byte);
}
mmcr1 |= (unsigned long)ttm
<< (MMCR1_TD_CP_DBG0SEL_SH - 2 * byte);
}
/* Second pass: assign PMCs, set PMCxSEL and PMCx_ADDER_SEL fields */
memset(pmcsel, 0x8, sizeof(pmcsel)); /* 8 means don't count */
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;
byte = (event[i] >> PM_BYTE_SH) & PM_BYTE_MSK;
psel = event[i] & PM_PMCSEL_MSK;
if (!pmc) {
/* Bus event or any-PMC direct event */
if (unit)
psel |= 0x10 | ((byte & 2) << 2);
else
psel |= 8;
for (pmc = 0; pmc < 8; ++pmc) {
if (pmc_inuse & (1 << pmc))
continue;
grp = (pmc >> 1) & 1;
if (unit) {
if (grp == (byte & 1))
break;
} else if (pmc_grp_use[grp] < 4) {
++pmc_grp_use[grp];
break;
}
}
pmc_inuse |= 1 << pmc;
} else {
/* Direct event */
--pmc;
if (psel == 0 && (byte & 2))
/* add events on higher-numbered bus */
mmcr1 |= 1ull << mmcr1_adder_bits[pmc];
}
pmcsel[pmc] = psel;
hwc[i] = pmc;
spcsel = (event[i] >> PM_SPCSEL_SH) & PM_SPCSEL_MSK;
mmcr1 |= spcsel;
if (p970_marked_instr_event(event[i]))
mmcra |= MMCRA_SAMPLE_ENABLE;
}
for (pmc = 0; pmc < 2; ++pmc)
mmcr0 |= pmcsel[pmc] << (MMCR0_PMC1SEL_SH - 7 * pmc);
for (; pmc < 8; ++pmc)
mmcr1 |= (unsigned long)pmcsel[pmc]
<< (MMCR1_PMC3SEL_SH - 5 * (pmc - 2));
if (pmc_inuse & 1)
mmcr0 |= MMCR0_PMC1CE;
if (pmc_inuse & 0xfe)
mmcr0 |= MMCR0_PMCjCE;
mmcra |= 0x2000; /* mark only one IOP per PPC instruction */
/* Return MMCRx values */
mmcr[0] = mmcr0;
mmcr[1] = mmcr1;
mmcr[2] = mmcra;
return 0;
}
static void p970_disable_pmc(unsigned int pmc, unsigned long mmcr[])
{
int shift, i;
if (pmc <= 1) {
shift = MMCR0_PMC1SEL_SH - 7 * pmc;
i = 0;
} else {
shift = MMCR1_PMC3SEL_SH - 5 * (pmc - 2);
i = 1;
}
/*
* Setting the PMCxSEL field to 0x08 disables PMC x.
*/
mmcr[i] = (mmcr[i] & ~(0x1fUL << shift)) | (0x08UL << shift);
}
static int ppc970_generic_events[] = {
[PERF_COUNT_HW_CPU_CYCLES] = 7,
[PERF_COUNT_HW_INSTRUCTIONS] = 1,
[PERF_COUNT_HW_CACHE_REFERENCES] = 0x8810, /* PM_LD_REF_L1 */
[PERF_COUNT_HW_CACHE_MISSES] = 0x3810, /* PM_LD_MISS_L1 */
[PERF_COUNT_HW_BRANCH_INSTRUCTIONS] = 0x431, /* PM_BR_ISSUED */
[PERF_COUNT_HW_BRANCH_MISSES] = 0x327, /* PM_GRP_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 ppc970_cache_events[C(MAX)][C(OP_MAX)][C(RESULT_MAX)] = {
[C(L1D)] = { /* RESULT_ACCESS RESULT_MISS */
[C(OP_READ)] = { 0x8810, 0x3810 },
[C(OP_WRITE)] = { 0x7810, 0x813 },
[C(OP_PREFETCH)] = { 0x731, 0 },
},
[C(L1I)] = { /* RESULT_ACCESS RESULT_MISS */
[C(OP_READ)] = { 0, 0 },
[C(OP_WRITE)] = { -1, -1 },
[C(OP_PREFETCH)] = { 0, 0 },
},
[C(LL)] = { /* RESULT_ACCESS RESULT_MISS */
[C(OP_READ)] = { 0, 0 },
[C(OP_WRITE)] = { 0, 0 },
[C(OP_PREFETCH)] = { 0x733, 0 },
},
[C(DTLB)] = { /* RESULT_ACCESS RESULT_MISS */
[C(OP_READ)] = { 0, 0x704 },
[C(OP_WRITE)] = { -1, -1 },
[C(OP_PREFETCH)] = { -1, -1 },
},
[C(ITLB)] = { /* RESULT_ACCESS RESULT_MISS */
[C(OP_READ)] = { 0, 0x700 },
[C(OP_WRITE)] = { -1, -1 },
[C(OP_PREFETCH)] = { -1, -1 },
},
[C(BPU)] = { /* RESULT_ACCESS RESULT_MISS */
[C(OP_READ)] = { 0x431, 0x327 },
[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 },
},
};
static struct power_pmu ppc970_pmu = {
.name = "PPC970/FX/MP",
.n_counter = 8,
.max_alternatives = 2,
.add_fields = 0x001100005555ull,
.test_adder = 0x013300000000ull,
.compute_mmcr = p970_compute_mmcr,
.get_constraint = p970_get_constraint,
.get_alternatives = p970_get_alternatives,
.disable_pmc = p970_disable_pmc,
.n_generic = ARRAY_SIZE(ppc970_generic_events),
.generic_events = ppc970_generic_events,
.cache_events = &ppc970_cache_events,
.flags = PPMU_NO_SIPR | PPMU_NO_CONT_SAMPLING,
};
static int __init init_ppc970_pmu(void)
{
if (!cur_cpu_spec->oprofile_cpu_type ||
(strcmp(cur_cpu_spec->oprofile_cpu_type, "ppc64/970")
&& strcmp(cur_cpu_spec->oprofile_cpu_type, "ppc64/970MP")))
return -ENODEV;
return register_power_pmu(&ppc970_pmu);
}
early_initcall(init_ppc970_pmu);
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