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460b48a0fe
A minor fix to our IMC PMU code to print a less confusing error message when the driver can't initialise properly. A fix for a bug where a user requesting an unsupported branch sampling filter can corrupt PMU state, preventing the PMU from counting properly. And finally a fix for a bug in our support for kexec_file_load(), which prevented loading a kernel and initramfs. Most versions of kexec don't yet use kexec_file_load(). Thanks to: Anju T Sudhakar, Dave Young, Madhavan Srinivasan, Ravi Bangoria, Thiago Jung Bauermann. -----BEGIN PGP SIGNATURE----- iQIcBAABAgAGBQJc86afAAoJEFHr6jzI4aWAIC8P/R/1Y8ro94tmu58MvqNmG80F Rc/+/1dY023X/itMHikSzPzs1UnQ1sjSKOOk3WOJcgVBE6Ks9Q7peeWD6wnSwYUq PwvXAZNmsD0Bgh9Oazj7M4dMSZHq7zJzQ8WzopltVueKgx941BLwYPRZG5zFXfcV k2Zaln87wfOuyfl/gQyWuG2ikziHJl9EvS3IIFejAnnogkFMti/FAe5bYXP3IT4W c4whLQJMNLeaeA7zeFBUvotWCZVfCq+Li9QTKWYJIPIZqN3kSBP3wHuUC8wEFuXa 32+qu7RW5NfbuJERtCJYXqjO9C9A/QgOAm2n0LF2vBzo5CwBIqiR69PRuVzzUekU NhYsHbbwviRl1By7pxUCNm48TW+3utm903etEp+PPV3FYdG+E2hlhs8NoUEdiN5X PWzEMqUqneN6+HnwpEeeiDQef19XTaGr3PUd8CtJYJQ4rSeyvnBASjGKfVuBW6FL 85aCwsmAYdapJOyhK5OSaDEWwMnpLBClJKqNrdH7y9fFm2lFHSJSNxHERBtSQcfx Ra+F7M0tyPRJFmVfXiX8u2ZYvYBLUIYUV1+mJHokEFOR9tW+Oy1lV3UMlXzWZXqb CY3qpCk0ix1rLjv8VpDoVQE2LkMhhUGqsgymSFueIwsrQhfhb/ymiVmaEH202tTM DyvBWmVuI9vyqR3Vt9GQ =ilhV -----END PGP SIGNATURE----- Merge tag 'powerpc-5.2-3' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux Pull powerpc fixes from Michael Ellerman: "A minor fix to our IMC PMU code to print a less confusing error message when the driver can't initialise properly. A fix for a bug where a user requesting an unsupported branch sampling filter can corrupt PMU state, preventing the PMU from counting properly. And finally a fix for a bug in our support for kexec_file_load(), which prevented loading a kernel and initramfs. Most versions of kexec don't yet use kexec_file_load(). Thanks to: Anju T Sudhakar, Dave Young, Madhavan Srinivasan, Ravi Bangoria, Thiago Jung Bauermann" * tag 'powerpc-5.2-3' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux: powerpc/kexec: Fix loading of kernel + initramfs with kexec_file_load() powerpc/perf: Fix MMCRA corruption by bhrb_filter powerpc/powernv: Return for invalid IMC domain
469 lines
13 KiB
C
469 lines
13 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Performance counter support for POWER9 processors.
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*
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* Copyright 2009 Paul Mackerras, IBM Corporation.
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* Copyright 2013 Michael Ellerman, IBM Corporation.
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* Copyright 2016 Madhavan Srinivasan, IBM Corporation.
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*/
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#define pr_fmt(fmt) "power9-pmu: " fmt
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#include "isa207-common.h"
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/*
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* Raw event encoding for Power9:
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*
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* 60 56 52 48 44 40 36 32
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* | - - - - | - - - - | - - - - | - - - - | - - - - | - - - - | - - - - | - - - - |
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* | | [ ] [ ] [ thresh_cmp ] [ thresh_ctl ]
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* | | | | |
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* | | *- IFM (Linux) | thresh start/stop -*
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* | *- BHRB (Linux) *sm
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* *- EBB (Linux)
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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 ] [cache] [ pmc ] [unit ] [] m [ pmcxsel ]
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* | | | | |
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* | | | | *- mark
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* | | *- L1/L2/L3 cache_sel |
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* | | |
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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 thresh_cmp:
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* MMCRA[9:11] = thresh_cmp[0:2]
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* MMCRA[12:18] = thresh_cmp[3:9]
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*
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* MMCR1[16] = cache_sel[2]
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* MMCR1[17] = cache_sel[3]
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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] = sm
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*/
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/*
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* Some power9 event codes.
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*/
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#define EVENT(_name, _code) _name = _code,
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enum {
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#include "power9-events-list.h"
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};
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#undef EVENT
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/* MMCRA IFM bits - POWER9 */
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#define POWER9_MMCRA_IFM1 0x0000000040000000UL
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#define POWER9_MMCRA_IFM2 0x0000000080000000UL
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#define POWER9_MMCRA_IFM3 0x00000000C0000000UL
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#define POWER9_MMCRA_BHRB_MASK 0x00000000C0000000UL
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/* Nasty Power9 specific hack */
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#define PVR_POWER9_CUMULUS 0x00002000
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/* PowerISA v2.07 format attribute structure*/
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extern struct attribute_group isa207_pmu_format_group;
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int p9_dd21_bl_ev[] = {
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PM_MRK_ST_DONE_L2,
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PM_RADIX_PWC_L1_HIT,
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PM_FLOP_CMPL,
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PM_MRK_NTF_FIN,
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PM_RADIX_PWC_L2_HIT,
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PM_IFETCH_THROTTLE,
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PM_MRK_L2_TM_ST_ABORT_SISTER,
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PM_RADIX_PWC_L3_HIT,
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PM_RUN_CYC_SMT2_MODE,
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PM_TM_TX_PASS_RUN_INST,
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PM_DISP_HELD_SYNC_HOLD,
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};
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int p9_dd22_bl_ev[] = {
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PM_DTLB_MISS_16G,
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PM_DERAT_MISS_2M,
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PM_DTLB_MISS_2M,
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PM_MRK_DTLB_MISS_1G,
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PM_DTLB_MISS_4K,
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PM_DERAT_MISS_1G,
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PM_MRK_DERAT_MISS_2M,
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PM_MRK_DTLB_MISS_4K,
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PM_MRK_DTLB_MISS_16G,
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PM_DTLB_MISS_64K,
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PM_MRK_DERAT_MISS_1G,
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PM_MRK_DTLB_MISS_64K,
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PM_DISP_HELD_SYNC_HOLD,
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PM_DTLB_MISS_16M,
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PM_DTLB_MISS_1G,
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PM_MRK_DTLB_MISS_16M,
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};
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/* Table of alternatives, sorted by column 0 */
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static const unsigned int power9_event_alternatives[][MAX_ALT] = {
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{ PM_INST_DISP, PM_INST_DISP_ALT },
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{ PM_RUN_CYC_ALT, PM_RUN_CYC },
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{ PM_RUN_INST_CMPL_ALT, PM_RUN_INST_CMPL },
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{ PM_LD_MISS_L1, PM_LD_MISS_L1_ALT },
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{ PM_BR_2PATH, PM_BR_2PATH_ALT },
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};
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static int power9_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(power9_event_alternatives), flags,
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power9_event_alternatives);
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return num_alt;
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}
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GENERIC_EVENT_ATTR(cpu-cycles, PM_CYC);
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GENERIC_EVENT_ATTR(stalled-cycles-frontend, PM_ICT_NOSLOT_CYC);
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GENERIC_EVENT_ATTR(stalled-cycles-backend, PM_CMPLU_STALL);
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GENERIC_EVENT_ATTR(instructions, PM_INST_CMPL);
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GENERIC_EVENT_ATTR(branch-instructions, PM_BR_CMPL);
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GENERIC_EVENT_ATTR(branch-misses, PM_BR_MPRED_CMPL);
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GENERIC_EVENT_ATTR(cache-references, PM_LD_REF_L1);
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GENERIC_EVENT_ATTR(cache-misses, PM_LD_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_FIN);
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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_L1_PREF);
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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_WRITE);
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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_PREF_ALL);
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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 *power9_events_attr[] = {
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GENERIC_EVENT_PTR(PM_CYC),
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GENERIC_EVENT_PTR(PM_ICT_NOSLOT_CYC),
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GENERIC_EVENT_PTR(PM_CMPLU_STALL),
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GENERIC_EVENT_PTR(PM_INST_CMPL),
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GENERIC_EVENT_PTR(PM_BR_CMPL),
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GENERIC_EVENT_PTR(PM_BR_MPRED_CMPL),
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GENERIC_EVENT_PTR(PM_LD_REF_L1),
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GENERIC_EVENT_PTR(PM_LD_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_FIN),
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CACHE_EVENT_PTR(PM_LD_REF_L1),
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CACHE_EVENT_PTR(PM_L1_PREF),
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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_WRITE),
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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_PREF_ALL),
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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 struct attribute_group power9_pmu_events_group = {
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.name = "events",
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.attrs = power9_events_attr,
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};
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PMU_FORMAT_ATTR(event, "config:0-51");
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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:20-23");
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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(thresh_cmp, "config:40-49");
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PMU_FORMAT_ATTR(sdar_mode, "config:50-51");
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static struct attribute *power9_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_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_thresh_cmp.attr,
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&format_attr_sdar_mode.attr,
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NULL,
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};
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static struct attribute_group power9_pmu_format_group = {
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.name = "format",
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.attrs = power9_pmu_format_attr,
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};
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static const struct attribute_group *power9_pmu_attr_groups[] = {
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&power9_pmu_format_group,
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&power9_pmu_events_group,
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NULL,
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};
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static int power9_generic_events[] = {
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[PERF_COUNT_HW_CPU_CYCLES] = PM_CYC,
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[PERF_COUNT_HW_STALLED_CYCLES_FRONTEND] = PM_ICT_NOSLOT_CYC,
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[PERF_COUNT_HW_STALLED_CYCLES_BACKEND] = PM_CMPLU_STALL,
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[PERF_COUNT_HW_INSTRUCTIONS] = PM_INST_CMPL,
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[PERF_COUNT_HW_BRANCH_INSTRUCTIONS] = PM_BR_CMPL,
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[PERF_COUNT_HW_BRANCH_MISSES] = PM_BR_MPRED_CMPL,
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[PERF_COUNT_HW_CACHE_REFERENCES] = PM_LD_REF_L1,
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[PERF_COUNT_HW_CACHE_MISSES] = PM_LD_MISS_L1_FIN,
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};
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static u64 power9_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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return -1;
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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 |= POWER9_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 power9_config_bhrb(u64 pmu_bhrb_filter)
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{
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pmu_bhrb_filter &= POWER9_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 int power9_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_FIN,
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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_L1_PREF,
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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_L1_DEMAND_WRITE,
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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_WRITE,
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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) ] = 0,
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[ C(RESULT_MISS) ] = 0,
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},
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[ C(OP_PREFETCH) ] = {
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[ C(RESULT_ACCESS) ] = PM_L3_PREF_ALL,
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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) ] = {
|
||
[ 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_BR_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,
|
||
.group_constraint_mask = CNST_CACHE_PMC4_MASK,
|
||
.group_constraint_val = CNST_CACHE_PMC4_VAL,
|
||
.compute_mmcr = isa207_compute_mmcr,
|
||
.config_bhrb = power9_config_bhrb,
|
||
.bhrb_filter_map = power9_bhrb_filter_map,
|
||
.get_constraint = isa207_get_constraint,
|
||
.get_alternatives = power9_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,
|
||
.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,
|
||
};
|
||
|
||
int init_power9_pmu(void)
|
||
{
|
||
int rc = 0;
|
||
unsigned int pvr = mfspr(SPRN_PVR);
|
||
|
||
/* Comes from cpu_specs[] */
|
||
if (!cur_cpu_spec->oprofile_cpu_type ||
|
||
strcmp(cur_cpu_spec->oprofile_cpu_type, "ppc64/power9"))
|
||
return -ENODEV;
|
||
|
||
/* Blacklist events */
|
||
if (!(pvr & PVR_POWER9_CUMULUS)) {
|
||
if ((PVR_CFG(pvr) == 2) && (PVR_MIN(pvr) == 1)) {
|
||
power9_pmu.blacklist_ev = p9_dd21_bl_ev;
|
||
power9_pmu.n_blacklist_ev = ARRAY_SIZE(p9_dd21_bl_ev);
|
||
} else if ((PVR_CFG(pvr) == 2) && (PVR_MIN(pvr) == 2)) {
|
||
power9_pmu.blacklist_ev = p9_dd22_bl_ev;
|
||
power9_pmu.n_blacklist_ev = ARRAY_SIZE(p9_dd22_bl_ev);
|
||
}
|
||
}
|
||
|
||
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;
|
||
}
|