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aca7cf5b1f
Base enablement patch to register performance monitoring hardware support for power12. Patch introduce the raw event encoding format, defines the supported list of events, config fields for the event attributes and their corresponding bit values which are exported via sysfs. Signed-off-by: Athira Rajeev <atrajeev@linux.ibm.com> Signed-off-by: Mahesh Salgaonkar <mahesh@linux.ibm.com> Tested-by: Praveen K Pandey <praveen@linux.ibm.com> Reviewed-by: Nikhil Kumar Singh <nikhilks@linux.ibm.com> Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com> Link: https://patch.msgid.link/20260806051120.3703698-5-mahesh@linux.ibm.com
467 lines
13 KiB
C
467 lines
13 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Performance counter support for Power12 processors.
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*
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* Copyright 2026 Athira Rajeev, IBM Corporation.
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*/
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#define pr_fmt(fmt) "power12-pmu: " fmt
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#include "isa207-common.h"
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/*
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* Raw event encoding for Power12:
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*
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* 60 56 52 48 44 40 36 32
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* | - - - - | - - - - | - - - - | - - - - | - - - - | - - - - | - - - - | - - - - |
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* | | [ ] [ src_match ] [ src_mask ] | [ ] [ l2l3_sel ] [ thresh_ctl ]
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* | | | | | |
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* | | *- IFM (Linux) | | thresh start/stop -*
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* | *- BHRB (Linux) | src_sel
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* *- EBB (Linux) *invert_bit
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*
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* 28 24 20 16 12 8 4 0
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* | - - - - | - - - - | - - - - | - - - - | - - - - | - - - - | - - - - | - - - - |
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* [ ] [ sample ] [ ] [ ] [ pmc ] [unit ] [ ] | m [ pmcxsel ]
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* | | | | | | |
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* | | | | | | *- mark
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* | | | *- L1/L2/L3 cache_sel | |*-radix_scope_qual
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* | | sdar_mode |
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* | *- sampling mode for marked events *- combine
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* |
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* *- thresh_sel
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*
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* Below uses IBM bit numbering.
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*
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* MMCR1[x:y] = unit (PMCxUNIT)
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* MMCR1[24] = pmc1combine[0]
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* MMCR1[25] = pmc1combine[1]
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* MMCR1[26] = pmc2combine[0]
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* MMCR1[27] = pmc2combine[1]
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* MMCR1[28] = pmc3combine[0]
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* MMCR1[29] = pmc3combine[1]
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* MMCR1[30] = pmc4combine[0]
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* MMCR1[31] = pmc4combine[1]
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*
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* if pmc == 3 and unit == 0 and pmcxsel[0:6] == 0b0101011
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* MMCR1[20:27] = thresh_ctl
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* else if pmc == 4 and unit == 0xf and pmcxsel[0:6] == 0b0101001
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* MMCR1[20:27] = thresh_ctl
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* else
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* MMCRA[48:55] = thresh_ctl (THRESH START/END)
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*
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* if thresh_sel:
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* MMCRA[45:47] = thresh_sel
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*
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* if l2l3_sel:
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* MMCR2[56:60] = l2l3_sel[0:4]
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*
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* MMCR1[16] = cache_sel[0]
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* MMCR1[17] = cache_sel[1]
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* MMCR1[18] = radix_scope_qual
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*
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* if mark:
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* MMCRA[63] = 1 (SAMPLE_ENABLE)
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* MMCRA[57:59] = sample[0:2] (RAND_SAMP_ELIG)
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* MMCRA[61:62] = sample[3:4] (RAND_SAMP_MODE)
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*
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* if EBB and BHRB:
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* MMCRA[32:33] = IFM
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*
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* MMCRA[SDAR_MODE] = sdar_mode[0:1]
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*/
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/*
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* Some power12 event codes.
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*/
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#define EVENT(_name, _code) enum{_name = _code}
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#include "power12-events-list.h"
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#undef EVENT
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/* MMCRA IFM bits - POWER12 */
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#define POWER12_MMCRA_IFM1 0x0000000040000000UL
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#define POWER12_MMCRA_IFM2 0x0000000080000000UL
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#define POWER12_MMCRA_IFM3 0x00000000C0000000UL
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#define POWER12_MMCRA_BHRB_MASK 0x00000000C0000000UL
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extern u64 PERF_REG_EXTENDED_MASK;
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/* Table of alternatives, sorted by column 0 */
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static const unsigned int power12_event_alternatives[][MAX_ALT] = {
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{ PM_INST_CMPL_ALT, PM_INST_CMPL },
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{ PM_CYC_ALT, PM_CYC },
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};
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static int power12_get_alternatives(u64 event, unsigned int flags, u64 alt[])
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{
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int num_alt = 0;
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num_alt = isa207_get_alternatives(event, alt,
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ARRAY_SIZE(power12_event_alternatives), flags,
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power12_event_alternatives);
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return num_alt;
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}
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static int power12_check_attr_config(struct perf_event *ev)
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{
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u64 val;
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u64 event = ev->attr.config;
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val = (event >> EVENT_SAMPLE_SHIFT) & EVENT_SAMPLE_MASK;
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if (val == 0x10 || isa3XX_check_attr_config(ev))
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return -EINVAL;
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return 0;
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}
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GENERIC_EVENT_ATTR(cpu-cycles, PM_CYC);
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GENERIC_EVENT_ATTR(instructions, PM_INST_CMPL);
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GENERIC_EVENT_ATTR(branch-instructions, PM_BR_FIN);
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GENERIC_EVENT_ATTR(branch-misses, PM_MPRED_BR_FIN);
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GENERIC_EVENT_ATTR(cache-references, PM_LD_REF_L1);
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GENERIC_EVENT_ATTR(cache-misses, PM_LD_DEMAND_MISS_L1_FIN);
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GENERIC_EVENT_ATTR(mem-loads, MEM_LOADS);
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GENERIC_EVENT_ATTR(mem-stores, MEM_STORES);
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CACHE_EVENT_ATTR(L1-dcache-load-misses, PM_LD_MISS_L1);
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CACHE_EVENT_ATTR(L1-dcache-loads, PM_LD_REF_L1);
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CACHE_EVENT_ATTR(L1-dcache-prefetches, PM_LD_PREFETCH_CACHE_LINE_MISS);
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CACHE_EVENT_ATTR(L1-dcache-store-misses, PM_ST_MISS_L1);
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CACHE_EVENT_ATTR(L1-icache-load-misses, PM_L1_ICACHE_MISS);
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CACHE_EVENT_ATTR(L1-icache-loads, PM_INST_FROM_L1);
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CACHE_EVENT_ATTR(L1-icache-prefetches, PM_IC_PREF_REQ);
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CACHE_EVENT_ATTR(LLC-load-misses, PM_DATA_FROM_L3MISS);
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CACHE_EVENT_ATTR(LLC-loads, PM_DATA_FROM_L3);
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CACHE_EVENT_ATTR(LLC-prefetches, PM_L3_PF_MISS_L3);
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CACHE_EVENT_ATTR(LLC-store-misses, PM_L2_ST_MISS);
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CACHE_EVENT_ATTR(LLC-stores, PM_L2_ST);
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CACHE_EVENT_ATTR(branch-load-misses, PM_BR_MPRED_CMPL);
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CACHE_EVENT_ATTR(branch-loads, PM_BR_CMPL);
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CACHE_EVENT_ATTR(dTLB-load-misses, PM_DTLB_MISS);
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CACHE_EVENT_ATTR(iTLB-load-misses, PM_ITLB_MISS);
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static struct attribute *power12_events_attr[] = {
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GENERIC_EVENT_PTR(PM_CYC),
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GENERIC_EVENT_PTR(PM_INST_CMPL),
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GENERIC_EVENT_PTR(PM_BR_FIN),
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GENERIC_EVENT_PTR(PM_MPRED_BR_FIN),
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GENERIC_EVENT_PTR(PM_LD_REF_L1),
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GENERIC_EVENT_PTR(PM_LD_DEMAND_MISS_L1_FIN),
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GENERIC_EVENT_PTR(MEM_LOADS),
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GENERIC_EVENT_PTR(MEM_STORES),
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CACHE_EVENT_PTR(PM_LD_MISS_L1),
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CACHE_EVENT_PTR(PM_LD_REF_L1),
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CACHE_EVENT_PTR(PM_LD_PREFETCH_CACHE_LINE_MISS),
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CACHE_EVENT_PTR(PM_ST_MISS_L1),
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CACHE_EVENT_PTR(PM_L1_ICACHE_MISS),
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CACHE_EVENT_PTR(PM_INST_FROM_L1),
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CACHE_EVENT_PTR(PM_IC_PREF_REQ),
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CACHE_EVENT_PTR(PM_DATA_FROM_L3MISS),
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CACHE_EVENT_PTR(PM_DATA_FROM_L3),
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CACHE_EVENT_PTR(PM_L3_PF_MISS_L3),
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CACHE_EVENT_PTR(PM_L2_ST_MISS),
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CACHE_EVENT_PTR(PM_L2_ST),
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CACHE_EVENT_PTR(PM_BR_MPRED_CMPL),
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CACHE_EVENT_PTR(PM_BR_CMPL),
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CACHE_EVENT_PTR(PM_DTLB_MISS),
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CACHE_EVENT_PTR(PM_ITLB_MISS),
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NULL
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};
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static const struct attribute_group power12_pmu_events_group = {
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.name = "events",
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.attrs = power12_events_attr,
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};
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PMU_FORMAT_ATTR(event, "config:0-59");
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PMU_FORMAT_ATTR(pmcxsel, "config:0-7");
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PMU_FORMAT_ATTR(mark, "config:8");
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PMU_FORMAT_ATTR(combine, "config:10-11");
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PMU_FORMAT_ATTR(unit, "config:12-15");
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PMU_FORMAT_ATTR(pmc, "config:16-19");
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PMU_FORMAT_ATTR(cache_sel, "config:20-21");
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PMU_FORMAT_ATTR(sdar_mode, "config:22-23");
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PMU_FORMAT_ATTR(sample_mode, "config:24-28");
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PMU_FORMAT_ATTR(thresh_sel, "config:29-31");
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PMU_FORMAT_ATTR(thresh_stop, "config:32-35");
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PMU_FORMAT_ATTR(thresh_start, "config:36-39");
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PMU_FORMAT_ATTR(l2l3_sel, "config:40-44");
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PMU_FORMAT_ATTR(src_sel, "config:45-46");
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PMU_FORMAT_ATTR(invert_bit, "config:47");
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PMU_FORMAT_ATTR(src_mask, "config:48-53");
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PMU_FORMAT_ATTR(src_match, "config:54-59");
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PMU_FORMAT_ATTR(radix_scope, "config:9");
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PMU_FORMAT_ATTR(thresh_cmp, "config1:0-17");
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static struct attribute *power12_pmu_format_attr[] = {
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&format_attr_event.attr,
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&format_attr_pmcxsel.attr,
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&format_attr_mark.attr,
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&format_attr_combine.attr,
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&format_attr_unit.attr,
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&format_attr_pmc.attr,
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&format_attr_cache_sel.attr,
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&format_attr_sdar_mode.attr,
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&format_attr_sample_mode.attr,
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&format_attr_thresh_sel.attr,
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&format_attr_thresh_stop.attr,
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&format_attr_thresh_start.attr,
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&format_attr_l2l3_sel.attr,
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&format_attr_src_sel.attr,
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&format_attr_invert_bit.attr,
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&format_attr_src_mask.attr,
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&format_attr_src_match.attr,
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&format_attr_radix_scope.attr,
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&format_attr_thresh_cmp.attr,
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NULL,
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};
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static const struct attribute_group power12_pmu_format_group = {
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.name = "format",
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.attrs = power12_pmu_format_attr,
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};
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static const struct attribute_group *power12_pmu_attr_groups[] = {
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&power12_pmu_format_group,
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&power12_pmu_events_group,
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NULL,
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};
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static int power12_generic_events[] = {
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[PERF_COUNT_HW_CPU_CYCLES] = PM_CYC,
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[PERF_COUNT_HW_INSTRUCTIONS] = PM_INST_CMPL,
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[PERF_COUNT_HW_BRANCH_INSTRUCTIONS] = PM_BR_FIN,
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[PERF_COUNT_HW_BRANCH_MISSES] = PM_MPRED_BR_FIN,
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[PERF_COUNT_HW_CACHE_REFERENCES] = PM_LD_REF_L1,
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[PERF_COUNT_HW_CACHE_MISSES] = PM_LD_DEMAND_MISS_L1_FIN,
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};
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static u64 power12_bhrb_filter_map(u64 branch_sample_type)
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{
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u64 pmu_bhrb_filter = 0;
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/* BHRB and regular PMU events share the same privilege state
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* filter configuration. BHRB is always recorded along with a
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* regular PMU event. As the privilege state filter is handled
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* in the basic PMC configuration of the accompanying regular
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* PMU event, we ignore any separate BHRB specific request.
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*/
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/* No branch filter requested */
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if (branch_sample_type & PERF_SAMPLE_BRANCH_ANY)
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return pmu_bhrb_filter;
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/* Invalid branch filter options - HW does not support */
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if (branch_sample_type & PERF_SAMPLE_BRANCH_ANY_RETURN)
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return -1;
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if (branch_sample_type & PERF_SAMPLE_BRANCH_IND_CALL) {
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pmu_bhrb_filter |= POWER12_MMCRA_IFM2;
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return pmu_bhrb_filter;
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}
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if (branch_sample_type & PERF_SAMPLE_BRANCH_COND) {
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pmu_bhrb_filter |= POWER12_MMCRA_IFM3;
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return pmu_bhrb_filter;
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}
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if (branch_sample_type & PERF_SAMPLE_BRANCH_CALL)
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return -1;
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if (branch_sample_type & PERF_SAMPLE_BRANCH_ANY_CALL) {
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pmu_bhrb_filter |= POWER12_MMCRA_IFM1;
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return pmu_bhrb_filter;
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}
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/* Every thing else is unsupported */
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return -1;
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}
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static void power12_config_bhrb(u64 pmu_bhrb_filter)
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{
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pmu_bhrb_filter &= POWER12_MMCRA_BHRB_MASK;
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/* Enable BHRB filter in PMU */
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mtspr(SPRN_MMCRA, (mfspr(SPRN_MMCRA) | pmu_bhrb_filter));
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}
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#define C(x) PERF_COUNT_HW_CACHE_##x
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/*
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* Table of generalized cache-related events.
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* 0 means not supported, -1 means nonsensical, other values
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* are event codes.
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*/
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static u64 power12_cache_events[C(MAX)][C(OP_MAX)][C(RESULT_MAX)] = {
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[C(L1D)] = {
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[C(OP_READ)] = {
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[C(RESULT_ACCESS)] = PM_LD_REF_L1,
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[C(RESULT_MISS)] = PM_LD_MISS_L1,
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},
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[C(OP_WRITE)] = {
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[C(RESULT_ACCESS)] = 0,
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[C(RESULT_MISS)] = PM_ST_MISS_L1,
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},
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[C(OP_PREFETCH)] = {
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[C(RESULT_ACCESS)] = PM_LD_PREFETCH_CACHE_LINE_MISS,
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[C(RESULT_MISS)] = 0,
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},
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},
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[C(L1I)] = {
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[C(OP_READ)] = {
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[C(RESULT_ACCESS)] = PM_INST_FROM_L1,
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[C(RESULT_MISS)] = PM_L1_ICACHE_MISS,
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},
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[C(OP_WRITE)] = {
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[C(RESULT_ACCESS)] = PM_INST_FROM_L1MISS,
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[C(RESULT_MISS)] = -1,
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},
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[C(OP_PREFETCH)] = {
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[C(RESULT_ACCESS)] = PM_IC_PREF_REQ,
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[C(RESULT_MISS)] = 0,
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},
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},
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[C(LL)] = {
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[C(OP_READ)] = {
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[C(RESULT_ACCESS)] = PM_DATA_FROM_L3,
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[C(RESULT_MISS)] = PM_DATA_FROM_L3MISS,
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},
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[C(OP_WRITE)] = {
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[C(RESULT_ACCESS)] = PM_L2_ST,
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[C(RESULT_MISS)] = PM_L2_ST_MISS,
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},
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[C(OP_PREFETCH)] = {
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[C(RESULT_ACCESS)] = PM_L3_PF_MISS_L3,
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[C(RESULT_MISS)] = 0,
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},
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},
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[C(DTLB)] = {
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[C(OP_READ)] = {
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[C(RESULT_ACCESS)] = 0,
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[C(RESULT_MISS)] = PM_DTLB_MISS,
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},
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[C(OP_WRITE)] = {
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[C(RESULT_ACCESS)] = -1,
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[C(RESULT_MISS)] = -1,
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},
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[C(OP_PREFETCH)] = {
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[C(RESULT_ACCESS)] = -1,
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[C(RESULT_MISS)] = -1,
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},
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},
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[C(ITLB)] = {
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[C(OP_READ)] = {
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[C(RESULT_ACCESS)] = 0,
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[C(RESULT_MISS)] = PM_ITLB_MISS,
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},
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[C(OP_WRITE)] = {
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[C(RESULT_ACCESS)] = -1,
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[C(RESULT_MISS)] = -1,
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},
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[C(OP_PREFETCH)] = {
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[C(RESULT_ACCESS)] = -1,
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[C(RESULT_MISS)] = -1,
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},
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},
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[C(BPU)] = {
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[C(OP_READ)] = {
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[C(RESULT_ACCESS)] = PM_BR_CMPL,
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[C(RESULT_MISS)] = PM_BR_MPRED_CMPL,
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},
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[C(OP_WRITE)] = {
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[C(RESULT_ACCESS)] = -1,
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[C(RESULT_MISS)] = -1,
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},
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[C(OP_PREFETCH)] = {
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[C(RESULT_ACCESS)] = -1,
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[C(RESULT_MISS)] = -1,
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},
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},
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[C(NODE)] = {
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[C(OP_READ)] = {
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[C(RESULT_ACCESS)] = -1,
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[C(RESULT_MISS)] = -1,
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},
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[C(OP_WRITE)] = {
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[C(RESULT_ACCESS)] = -1,
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[C(RESULT_MISS)] = -1,
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},
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[C(OP_PREFETCH)] = {
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[C(RESULT_ACCESS)] = -1,
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[C(RESULT_MISS)] = -1,
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},
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},
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};
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#undef C
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/*
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* Set the MMCR0[CC56RUN] bit to enable counting for
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* PMC5 and PMC6 regardless of the state of CTRL[RUN],
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* so that we can use counters 5 and 6 as PM_INST_CMPL and
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* PM_CYC.
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*/
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static int power12_compute_mmcr(u64 event[], int n_ev,
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unsigned int hwc[], struct mmcr_regs *mmcr,
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struct perf_event *pevents[], u32 flags)
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{
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int ret;
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ret = isa207_compute_mmcr(event, n_ev, hwc, mmcr, pevents, flags);
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if (!ret)
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mmcr->mmcr0 |= MMCR0_C56RUN;
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return ret;
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}
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static struct power_pmu power12_pmu = {
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.name = "Power12",
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.n_counter = MAX_PMU_COUNTERS,
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.add_fields = ISA207_ADD_FIELDS,
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.test_adder = ISA207_TEST_ADDER,
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.group_constraint_mask = CNST_CACHE_PMC4_MASK,
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.group_constraint_val = CNST_CACHE_PMC4_VAL,
|
|
.compute_mmcr = power12_compute_mmcr,
|
|
.config_bhrb = power12_config_bhrb,
|
|
.bhrb_filter_map = power12_bhrb_filter_map,
|
|
.get_constraint = isa207_get_constraint,
|
|
.get_alternatives = power12_get_alternatives,
|
|
.get_mem_data_src = isa207_get_mem_data_src,
|
|
.get_mem_weight = isa207_get_mem_weight,
|
|
.disable_pmc = isa207_disable_pmc,
|
|
.flags = PPMU_HAS_SIER | PPMU_ARCH_207S |
|
|
PPMU_ARCH_31 | PPMU_HAS_ATTR_CONFIG1 |
|
|
PPMU_P10,
|
|
.n_generic = ARRAY_SIZE(power12_generic_events),
|
|
.generic_events = power12_generic_events,
|
|
.cache_events = &power12_cache_events,
|
|
.attr_groups = power12_pmu_attr_groups,
|
|
.bhrb_nr = 32,
|
|
.capabilities = PERF_PMU_CAP_EXTENDED_REGS,
|
|
.check_attr_config = power12_check_attr_config,
|
|
};
|
|
|
|
int __init init_power12_pmu(void)
|
|
{
|
|
unsigned int pvr;
|
|
int rc;
|
|
|
|
pvr = mfspr(SPRN_PVR);
|
|
if (PVR_VER(pvr) != PVR_POWER12)
|
|
return -ENODEV;
|
|
|
|
/* Set the PERF_REG_EXTENDED_MASK here */
|
|
PERF_REG_EXTENDED_MASK = PERF_REG_PMU_MASK_31;
|
|
|
|
rc = register_power_pmu(&power12_pmu);
|
|
if (rc)
|
|
return rc;
|
|
|
|
/* Tell userspace that EBB is supported */
|
|
cur_cpu_spec->cpu_user_features2 |= PPC_FEATURE2_EBB;
|
|
|
|
return 0;
|
|
}
|