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![Madhavan Srinivasan](/assets/img/avatar_default.png)
Most of the power processor generation performance monitoring unit (PMU) driver code is bundled in the kernel and one of those is enabled/registered based on the oprofile_cpu_type check at the boot. But things get little tricky incase of "compat" mode boot. IBM POWER System Server based processors has a compactibility mode feature, which simpily put is, Nth generation processor (lets say POWER8) will act and appear in a mode consistent with an earlier generation (N-1) processor (that is POWER7). And in this "compat" mode boot, kernel modify the "oprofile_cpu_type" to be Nth generation (POWER8). If Nth generation pmu driver is bundled (POWER8), it gets registered. Key dependency here is to have distro support for latest processor performance monitoring support. Patch here adds a generic "compat-mode" performance monitoring driver to be register in absence of powernv platform specific pmu driver. Driver supports only "cycles" and "instruction" events. "0x0001e" used as event code for "cycles" and "0x00002" used as event code for "instruction" events. New file called "generic-compat-pmu.c" is created to contain the driver specific code. And base raw event code format modeled on PPMU_ARCH_207S. Signed-off-by: Madhavan Srinivasan <maddy@linux.vnet.ibm.com> [mpe: Use SPDX tag for license] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
234 lines
5.5 KiB
C
234 lines
5.5 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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//
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// Copyright 2019 Madhavan Srinivasan, IBM Corporation.
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#define pr_fmt(fmt) "generic-compat-pmu: " fmt
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#include "isa207-common.h"
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/*
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* Raw event encoding:
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*
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* 60 56 52 48 44 40 36 32
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* | - - - - | - - - - | - - - - | - - - - | - - - - | - - - - | - - - - | - - - - |
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*
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* 28 24 20 16 12 8 4 0
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* | - - - - | - - - - | - - - - | - - - - | - - - - | - - - - | - - - - | - - - - |
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* [ pmc ] [unit ] [ ] m [ pmcxsel ]
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* | |
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* | *- mark
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* |
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* |
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* *- combine
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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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*/
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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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EVENT(PM_CYC, 0x0001e)
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EVENT(PM_INST_CMPL, 0x00002)
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};
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#undef EVENT
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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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static struct attribute *generic_compat_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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NULL
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};
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static struct attribute_group generic_compat_pmu_events_group = {
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.name = "events",
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.attrs = generic_compat_events_attr,
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};
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PMU_FORMAT_ATTR(event, "config:0-19");
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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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static struct attribute *generic_compat_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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NULL,
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};
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static struct attribute_group generic_compat_pmu_format_group = {
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.name = "format",
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.attrs = generic_compat_pmu_format_attr,
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};
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static const struct attribute_group *generic_compat_pmu_attr_groups[] = {
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&generic_compat_pmu_format_group,
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&generic_compat_pmu_events_group,
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NULL,
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};
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static int compat_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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};
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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 generic_compat_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) ] = 0,
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[ C(RESULT_MISS) ] = 0,
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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) ] = 0,
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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) ] = 0,
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[ C(RESULT_MISS) ] = 0,
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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) ] = -1,
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},
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[ C(OP_PREFETCH) ] = {
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[ C(RESULT_ACCESS) ] = 0,
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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) ] = 0,
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[ C(RESULT_MISS) ] = 0,
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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) ] = 0,
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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) ] = 0,
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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) ] = 0,
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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) ] = 0,
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[ C(RESULT_MISS) ] = 0,
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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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static struct power_pmu generic_compat_pmu = {
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.name = "GENERIC_COMPAT",
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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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.compute_mmcr = isa207_compute_mmcr,
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.get_constraint = isa207_get_constraint,
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.disable_pmc = isa207_disable_pmc,
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.flags = PPMU_HAS_SIER | PPMU_ARCH_207S,
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.n_generic = ARRAY_SIZE(compat_generic_events),
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.generic_events = compat_generic_events,
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.cache_events = &generic_compat_cache_events,
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.attr_groups = generic_compat_pmu_attr_groups,
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};
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int init_generic_compat_pmu(void)
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{
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int rc = 0;
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rc = register_power_pmu(&generic_compat_pmu);
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if (rc)
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return rc;
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/* Tell userspace that EBB is supported */
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cur_cpu_spec->cpu_user_features2 |= PPC_FEATURE2_EBB;
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return 0;
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}
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