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![Atish Patra](/assets/img/avatar_default.png)
The sscofpmf extension allows counter overflow and filtering for programmable counters. Enable the perf driver to handle the overflow interrupt. The overflow interrupt is a hart local interrupt. Thus, per cpu overflow interrupts are setup as a child under the root INTC irq domain. Signed-off-by: Atish Patra <atish.patra@wdc.com> Signed-off-by: Atish Patra <atishp@rivosinc.com> Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
790 lines
22 KiB
C
790 lines
22 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* RISC-V performance counter support.
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*
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* Copyright (C) 2021 Western Digital Corporation or its affiliates.
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*
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* This code is based on ARM perf event code which is in turn based on
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* sparc64 and x86 code.
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*/
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#define pr_fmt(fmt) "riscv-pmu-sbi: " fmt
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#include <linux/mod_devicetable.h>
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#include <linux/perf/riscv_pmu.h>
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#include <linux/platform_device.h>
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#include <linux/irq.h>
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#include <linux/irqdomain.h>
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#include <linux/of_irq.h>
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#include <linux/of.h>
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#include <asm/sbi.h>
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#include <asm/hwcap.h>
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union sbi_pmu_ctr_info {
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unsigned long value;
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struct {
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unsigned long csr:12;
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unsigned long width:6;
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#if __riscv_xlen == 32
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unsigned long reserved:13;
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#else
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unsigned long reserved:45;
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#endif
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unsigned long type:1;
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};
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};
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/**
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* RISC-V doesn't have hetergenous harts yet. This need to be part of
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* per_cpu in case of harts with different pmu counters
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*/
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static union sbi_pmu_ctr_info *pmu_ctr_list;
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static unsigned int riscv_pmu_irq;
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struct sbi_pmu_event_data {
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union {
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union {
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struct hw_gen_event {
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uint32_t event_code:16;
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uint32_t event_type:4;
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uint32_t reserved:12;
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} hw_gen_event;
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struct hw_cache_event {
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uint32_t result_id:1;
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uint32_t op_id:2;
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uint32_t cache_id:13;
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uint32_t event_type:4;
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uint32_t reserved:12;
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} hw_cache_event;
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};
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uint32_t event_idx;
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};
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};
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static const struct sbi_pmu_event_data pmu_hw_event_map[] = {
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[PERF_COUNT_HW_CPU_CYCLES] = {.hw_gen_event = {
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SBI_PMU_HW_CPU_CYCLES,
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SBI_PMU_EVENT_TYPE_HW, 0}},
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[PERF_COUNT_HW_INSTRUCTIONS] = {.hw_gen_event = {
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SBI_PMU_HW_INSTRUCTIONS,
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SBI_PMU_EVENT_TYPE_HW, 0}},
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[PERF_COUNT_HW_CACHE_REFERENCES] = {.hw_gen_event = {
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SBI_PMU_HW_CACHE_REFERENCES,
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SBI_PMU_EVENT_TYPE_HW, 0}},
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[PERF_COUNT_HW_CACHE_MISSES] = {.hw_gen_event = {
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SBI_PMU_HW_CACHE_MISSES,
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SBI_PMU_EVENT_TYPE_HW, 0}},
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[PERF_COUNT_HW_BRANCH_INSTRUCTIONS] = {.hw_gen_event = {
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SBI_PMU_HW_BRANCH_INSTRUCTIONS,
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SBI_PMU_EVENT_TYPE_HW, 0}},
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[PERF_COUNT_HW_BRANCH_MISSES] = {.hw_gen_event = {
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SBI_PMU_HW_BRANCH_MISSES,
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SBI_PMU_EVENT_TYPE_HW, 0}},
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[PERF_COUNT_HW_BUS_CYCLES] = {.hw_gen_event = {
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SBI_PMU_HW_BUS_CYCLES,
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SBI_PMU_EVENT_TYPE_HW, 0}},
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[PERF_COUNT_HW_STALLED_CYCLES_FRONTEND] = {.hw_gen_event = {
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SBI_PMU_HW_STALLED_CYCLES_FRONTEND,
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SBI_PMU_EVENT_TYPE_HW, 0}},
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[PERF_COUNT_HW_STALLED_CYCLES_BACKEND] = {.hw_gen_event = {
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SBI_PMU_HW_STALLED_CYCLES_BACKEND,
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SBI_PMU_EVENT_TYPE_HW, 0}},
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[PERF_COUNT_HW_REF_CPU_CYCLES] = {.hw_gen_event = {
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SBI_PMU_HW_REF_CPU_CYCLES,
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SBI_PMU_EVENT_TYPE_HW, 0}},
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};
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#define C(x) PERF_COUNT_HW_CACHE_##x
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static const struct sbi_pmu_event_data pmu_cache_event_map[PERF_COUNT_HW_CACHE_MAX]
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[PERF_COUNT_HW_CACHE_OP_MAX]
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[PERF_COUNT_HW_CACHE_RESULT_MAX] = {
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[C(L1D)] = {
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[C(OP_READ)] = {
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[C(RESULT_ACCESS)] = {.hw_cache_event = {C(RESULT_ACCESS),
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C(OP_READ), C(L1D), SBI_PMU_EVENT_TYPE_CACHE, 0}},
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[C(RESULT_MISS)] = {.hw_cache_event = {C(RESULT_MISS),
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C(OP_READ), C(L1D), SBI_PMU_EVENT_TYPE_CACHE, 0}},
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},
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[C(OP_WRITE)] = {
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[C(RESULT_ACCESS)] = {.hw_cache_event = {C(RESULT_ACCESS),
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C(OP_WRITE), C(L1D), SBI_PMU_EVENT_TYPE_CACHE, 0}},
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[C(RESULT_MISS)] = {.hw_cache_event = {C(RESULT_MISS),
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C(OP_WRITE), C(L1D), SBI_PMU_EVENT_TYPE_CACHE, 0}},
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},
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[C(OP_PREFETCH)] = {
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[C(RESULT_ACCESS)] = {.hw_cache_event = {C(RESULT_ACCESS),
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C(OP_PREFETCH), C(L1D), SBI_PMU_EVENT_TYPE_CACHE, 0}},
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[C(RESULT_MISS)] = {.hw_cache_event = {C(RESULT_MISS),
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C(OP_PREFETCH), C(L1D), SBI_PMU_EVENT_TYPE_CACHE, 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)] = {.hw_cache_event = {C(RESULT_ACCESS),
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C(OP_READ), C(L1I), SBI_PMU_EVENT_TYPE_CACHE, 0}},
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[C(RESULT_MISS)] = {.hw_cache_event = {C(RESULT_MISS), C(OP_READ),
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C(L1I), SBI_PMU_EVENT_TYPE_CACHE, 0}},
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},
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[C(OP_WRITE)] = {
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[C(RESULT_ACCESS)] = {.hw_cache_event = {C(RESULT_ACCESS),
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C(OP_WRITE), C(L1I), SBI_PMU_EVENT_TYPE_CACHE, 0}},
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[C(RESULT_MISS)] = {.hw_cache_event = {C(RESULT_MISS),
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C(OP_WRITE), C(L1I), SBI_PMU_EVENT_TYPE_CACHE, 0}},
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},
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[C(OP_PREFETCH)] = {
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[C(RESULT_ACCESS)] = {.hw_cache_event = {C(RESULT_ACCESS),
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C(OP_PREFETCH), C(L1I), SBI_PMU_EVENT_TYPE_CACHE, 0}},
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[C(RESULT_MISS)] = {.hw_cache_event = {C(RESULT_MISS),
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C(OP_PREFETCH), C(L1I), SBI_PMU_EVENT_TYPE_CACHE, 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)] = {.hw_cache_event = {C(RESULT_ACCESS),
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C(OP_READ), C(LL), SBI_PMU_EVENT_TYPE_CACHE, 0}},
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[C(RESULT_MISS)] = {.hw_cache_event = {C(RESULT_MISS),
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C(OP_READ), C(LL), SBI_PMU_EVENT_TYPE_CACHE, 0}},
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},
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[C(OP_WRITE)] = {
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[C(RESULT_ACCESS)] = {.hw_cache_event = {C(RESULT_ACCESS),
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C(OP_WRITE), C(LL), SBI_PMU_EVENT_TYPE_CACHE, 0}},
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[C(RESULT_MISS)] = {.hw_cache_event = {C(RESULT_MISS),
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C(OP_WRITE), C(LL), SBI_PMU_EVENT_TYPE_CACHE, 0}},
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},
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[C(OP_PREFETCH)] = {
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[C(RESULT_ACCESS)] = {.hw_cache_event = {C(RESULT_ACCESS),
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C(OP_PREFETCH), C(LL), SBI_PMU_EVENT_TYPE_CACHE, 0}},
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[C(RESULT_MISS)] = {.hw_cache_event = {C(RESULT_MISS),
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C(OP_PREFETCH), C(LL), SBI_PMU_EVENT_TYPE_CACHE, 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)] = {.hw_cache_event = {C(RESULT_ACCESS),
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C(OP_READ), C(DTLB), SBI_PMU_EVENT_TYPE_CACHE, 0}},
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[C(RESULT_MISS)] = {.hw_cache_event = {C(RESULT_MISS),
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C(OP_READ), C(DTLB), SBI_PMU_EVENT_TYPE_CACHE, 0}},
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},
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[C(OP_WRITE)] = {
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[C(RESULT_ACCESS)] = {.hw_cache_event = {C(RESULT_ACCESS),
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C(OP_WRITE), C(DTLB), SBI_PMU_EVENT_TYPE_CACHE, 0}},
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[C(RESULT_MISS)] = {.hw_cache_event = {C(RESULT_MISS),
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C(OP_WRITE), C(DTLB), SBI_PMU_EVENT_TYPE_CACHE, 0}},
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},
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[C(OP_PREFETCH)] = {
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[C(RESULT_ACCESS)] = {.hw_cache_event = {C(RESULT_ACCESS),
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C(OP_PREFETCH), C(DTLB), SBI_PMU_EVENT_TYPE_CACHE, 0}},
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[C(RESULT_MISS)] = {.hw_cache_event = {C(RESULT_MISS),
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C(OP_PREFETCH), C(DTLB), SBI_PMU_EVENT_TYPE_CACHE, 0}},
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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)] = {.hw_cache_event = {C(RESULT_ACCESS),
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C(OP_READ), C(ITLB), SBI_PMU_EVENT_TYPE_CACHE, 0}},
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[C(RESULT_MISS)] = {.hw_cache_event = {C(RESULT_MISS),
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C(OP_READ), C(ITLB), SBI_PMU_EVENT_TYPE_CACHE, 0}},
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},
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[C(OP_WRITE)] = {
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[C(RESULT_ACCESS)] = {.hw_cache_event = {C(RESULT_ACCESS),
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C(OP_WRITE), C(ITLB), SBI_PMU_EVENT_TYPE_CACHE, 0}},
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[C(RESULT_MISS)] = {.hw_cache_event = {C(RESULT_MISS),
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C(OP_WRITE), C(ITLB), SBI_PMU_EVENT_TYPE_CACHE, 0}},
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},
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[C(OP_PREFETCH)] = {
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[C(RESULT_ACCESS)] = {.hw_cache_event = {C(RESULT_ACCESS),
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C(OP_PREFETCH), C(ITLB), SBI_PMU_EVENT_TYPE_CACHE, 0}},
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[C(RESULT_MISS)] = {.hw_cache_event = {C(RESULT_MISS),
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C(OP_PREFETCH), C(ITLB), SBI_PMU_EVENT_TYPE_CACHE, 0}},
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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)] = {.hw_cache_event = {C(RESULT_ACCESS),
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C(OP_READ), C(BPU), SBI_PMU_EVENT_TYPE_CACHE, 0}},
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[C(RESULT_MISS)] = {.hw_cache_event = {C(RESULT_MISS),
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C(OP_READ), C(BPU), SBI_PMU_EVENT_TYPE_CACHE, 0}},
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},
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[C(OP_WRITE)] = {
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[C(RESULT_ACCESS)] = {.hw_cache_event = {C(RESULT_ACCESS),
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C(OP_WRITE), C(BPU), SBI_PMU_EVENT_TYPE_CACHE, 0}},
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[C(RESULT_MISS)] = {.hw_cache_event = {C(RESULT_MISS),
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C(OP_WRITE), C(BPU), SBI_PMU_EVENT_TYPE_CACHE, 0}},
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},
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[C(OP_PREFETCH)] = {
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[C(RESULT_ACCESS)] = {.hw_cache_event = {C(RESULT_ACCESS),
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C(OP_PREFETCH), C(BPU), SBI_PMU_EVENT_TYPE_CACHE, 0}},
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[C(RESULT_MISS)] = {.hw_cache_event = {C(RESULT_MISS),
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C(OP_PREFETCH), C(BPU), SBI_PMU_EVENT_TYPE_CACHE, 0}},
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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)] = {.hw_cache_event = {C(RESULT_ACCESS),
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C(OP_READ), C(NODE), SBI_PMU_EVENT_TYPE_CACHE, 0}},
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[C(RESULT_MISS)] = {.hw_cache_event = {C(RESULT_MISS),
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C(OP_READ), C(NODE), SBI_PMU_EVENT_TYPE_CACHE, 0}},
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},
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[C(OP_WRITE)] = {
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[C(RESULT_ACCESS)] = {.hw_cache_event = {C(RESULT_ACCESS),
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C(OP_WRITE), C(NODE), SBI_PMU_EVENT_TYPE_CACHE, 0}},
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[C(RESULT_MISS)] = {.hw_cache_event = {C(RESULT_MISS),
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C(OP_WRITE), C(NODE), SBI_PMU_EVENT_TYPE_CACHE, 0}},
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},
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[C(OP_PREFETCH)] = {
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[C(RESULT_ACCESS)] = {.hw_cache_event = {C(RESULT_ACCESS),
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C(OP_PREFETCH), C(NODE), SBI_PMU_EVENT_TYPE_CACHE, 0}},
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[C(RESULT_MISS)] = {.hw_cache_event = {C(RESULT_MISS),
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C(OP_PREFETCH), C(NODE), SBI_PMU_EVENT_TYPE_CACHE, 0}},
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},
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},
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};
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static int pmu_sbi_ctr_get_width(int idx)
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{
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return pmu_ctr_list[idx].width;
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}
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static bool pmu_sbi_ctr_is_fw(int cidx)
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{
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union sbi_pmu_ctr_info *info;
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info = &pmu_ctr_list[cidx];
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if (!info)
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return false;
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return (info->type == SBI_PMU_CTR_TYPE_FW) ? true : false;
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}
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static int pmu_sbi_ctr_get_idx(struct perf_event *event)
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{
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struct hw_perf_event *hwc = &event->hw;
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struct riscv_pmu *rvpmu = to_riscv_pmu(event->pmu);
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struct cpu_hw_events *cpuc = this_cpu_ptr(rvpmu->hw_events);
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struct sbiret ret;
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int idx;
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uint64_t cbase = 0;
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uint64_t cmask = GENMASK_ULL(rvpmu->num_counters - 1, 0);
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unsigned long cflags = 0;
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if (event->attr.exclude_kernel)
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cflags |= SBI_PMU_CFG_FLAG_SET_SINH;
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if (event->attr.exclude_user)
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cflags |= SBI_PMU_CFG_FLAG_SET_UINH;
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/* retrieve the available counter index */
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ret = sbi_ecall(SBI_EXT_PMU, SBI_EXT_PMU_COUNTER_CFG_MATCH, cbase, cmask,
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cflags, hwc->event_base, hwc->config, 0);
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if (ret.error) {
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pr_debug("Not able to find a counter for event %lx config %llx\n",
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hwc->event_base, hwc->config);
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return sbi_err_map_linux_errno(ret.error);
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}
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idx = ret.value;
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if (idx >= rvpmu->num_counters || !pmu_ctr_list[idx].value)
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return -ENOENT;
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/* Additional sanity check for the counter id */
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if (pmu_sbi_ctr_is_fw(idx)) {
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if (!test_and_set_bit(idx, cpuc->used_fw_ctrs))
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return idx;
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} else {
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if (!test_and_set_bit(idx, cpuc->used_hw_ctrs))
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return idx;
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}
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return -ENOENT;
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}
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static void pmu_sbi_ctr_clear_idx(struct perf_event *event)
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{
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struct hw_perf_event *hwc = &event->hw;
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struct riscv_pmu *rvpmu = to_riscv_pmu(event->pmu);
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struct cpu_hw_events *cpuc = this_cpu_ptr(rvpmu->hw_events);
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int idx = hwc->idx;
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if (pmu_sbi_ctr_is_fw(idx))
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clear_bit(idx, cpuc->used_fw_ctrs);
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else
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clear_bit(idx, cpuc->used_hw_ctrs);
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}
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static int pmu_event_find_cache(u64 config)
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{
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unsigned int cache_type, cache_op, cache_result, ret;
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cache_type = (config >> 0) & 0xff;
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if (cache_type >= PERF_COUNT_HW_CACHE_MAX)
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return -EINVAL;
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cache_op = (config >> 8) & 0xff;
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if (cache_op >= PERF_COUNT_HW_CACHE_OP_MAX)
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return -EINVAL;
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cache_result = (config >> 16) & 0xff;
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if (cache_result >= PERF_COUNT_HW_CACHE_RESULT_MAX)
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return -EINVAL;
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ret = pmu_cache_event_map[cache_type][cache_op][cache_result].event_idx;
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return ret;
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}
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static bool pmu_sbi_is_fw_event(struct perf_event *event)
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{
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u32 type = event->attr.type;
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u64 config = event->attr.config;
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if ((type == PERF_TYPE_RAW) && ((config >> 63) == 1))
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return true;
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else
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return false;
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}
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static int pmu_sbi_event_map(struct perf_event *event, u64 *econfig)
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{
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u32 type = event->attr.type;
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u64 config = event->attr.config;
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int bSoftware;
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u64 raw_config_val;
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int ret;
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switch (type) {
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case PERF_TYPE_HARDWARE:
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if (config >= PERF_COUNT_HW_MAX)
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return -EINVAL;
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ret = pmu_hw_event_map[event->attr.config].event_idx;
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break;
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case PERF_TYPE_HW_CACHE:
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ret = pmu_event_find_cache(config);
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break;
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case PERF_TYPE_RAW:
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/*
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* As per SBI specification, the upper 16 bits must be unused for
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* a raw event. Use the MSB (63b) to distinguish between hardware
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* raw event and firmware events.
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*/
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bSoftware = config >> 63;
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raw_config_val = config & RISCV_PMU_RAW_EVENT_MASK;
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if (bSoftware) {
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if (raw_config_val < SBI_PMU_FW_MAX)
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ret = (raw_config_val & 0xFFFF) |
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(SBI_PMU_EVENT_TYPE_FW << 16);
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else
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return -EINVAL;
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} else {
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ret = RISCV_PMU_RAW_EVENT_IDX;
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*econfig = raw_config_val;
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}
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break;
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default:
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ret = -EINVAL;
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break;
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}
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return ret;
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}
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static u64 pmu_sbi_ctr_read(struct perf_event *event)
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{
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struct hw_perf_event *hwc = &event->hw;
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int idx = hwc->idx;
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struct sbiret ret;
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union sbi_pmu_ctr_info info;
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u64 val = 0;
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if (pmu_sbi_is_fw_event(event)) {
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ret = sbi_ecall(SBI_EXT_PMU, SBI_EXT_PMU_COUNTER_FW_READ,
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hwc->idx, 0, 0, 0, 0, 0);
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|
if (!ret.error)
|
|
val = ret.value;
|
|
} else {
|
|
info = pmu_ctr_list[idx];
|
|
val = riscv_pmu_ctr_read_csr(info.csr);
|
|
if (IS_ENABLED(CONFIG_32BIT))
|
|
val = ((u64)riscv_pmu_ctr_read_csr(info.csr + 0x80)) << 31 | val;
|
|
}
|
|
|
|
return val;
|
|
}
|
|
|
|
static void pmu_sbi_ctr_start(struct perf_event *event, u64 ival)
|
|
{
|
|
struct sbiret ret;
|
|
struct hw_perf_event *hwc = &event->hw;
|
|
unsigned long flag = SBI_PMU_START_FLAG_SET_INIT_VALUE;
|
|
|
|
ret = sbi_ecall(SBI_EXT_PMU, SBI_EXT_PMU_COUNTER_START, hwc->idx,
|
|
1, flag, ival, ival >> 32, 0);
|
|
if (ret.error && (ret.error != SBI_ERR_ALREADY_STARTED))
|
|
pr_err("Starting counter idx %d failed with error %d\n",
|
|
hwc->idx, sbi_err_map_linux_errno(ret.error));
|
|
}
|
|
|
|
static void pmu_sbi_ctr_stop(struct perf_event *event, unsigned long flag)
|
|
{
|
|
struct sbiret ret;
|
|
struct hw_perf_event *hwc = &event->hw;
|
|
|
|
ret = sbi_ecall(SBI_EXT_PMU, SBI_EXT_PMU_COUNTER_STOP, hwc->idx, 1, flag, 0, 0, 0);
|
|
if (ret.error && (ret.error != SBI_ERR_ALREADY_STOPPED) &&
|
|
flag != SBI_PMU_STOP_FLAG_RESET)
|
|
pr_err("Stopping counter idx %d failed with error %d\n",
|
|
hwc->idx, sbi_err_map_linux_errno(ret.error));
|
|
}
|
|
|
|
static int pmu_sbi_find_num_ctrs(void)
|
|
{
|
|
struct sbiret ret;
|
|
|
|
ret = sbi_ecall(SBI_EXT_PMU, SBI_EXT_PMU_NUM_COUNTERS, 0, 0, 0, 0, 0, 0);
|
|
if (!ret.error)
|
|
return ret.value;
|
|
else
|
|
return sbi_err_map_linux_errno(ret.error);
|
|
}
|
|
|
|
static int pmu_sbi_get_ctrinfo(int nctr)
|
|
{
|
|
struct sbiret ret;
|
|
int i, num_hw_ctr = 0, num_fw_ctr = 0;
|
|
union sbi_pmu_ctr_info cinfo;
|
|
|
|
pmu_ctr_list = kcalloc(nctr, sizeof(*pmu_ctr_list), GFP_KERNEL);
|
|
if (!pmu_ctr_list)
|
|
return -ENOMEM;
|
|
|
|
for (i = 0; i <= nctr; i++) {
|
|
ret = sbi_ecall(SBI_EXT_PMU, SBI_EXT_PMU_COUNTER_GET_INFO, i, 0, 0, 0, 0, 0);
|
|
if (ret.error)
|
|
/* The logical counter ids are not expected to be contiguous */
|
|
continue;
|
|
cinfo.value = ret.value;
|
|
if (cinfo.type == SBI_PMU_CTR_TYPE_FW)
|
|
num_fw_ctr++;
|
|
else
|
|
num_hw_ctr++;
|
|
pmu_ctr_list[i].value = cinfo.value;
|
|
}
|
|
|
|
pr_info("%d firmware and %d hardware counters\n", num_fw_ctr, num_hw_ctr);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline void pmu_sbi_stop_all(struct riscv_pmu *pmu)
|
|
{
|
|
/**
|
|
* No need to check the error because we are disabling all the counters
|
|
* which may include counters that are not enabled yet.
|
|
*/
|
|
sbi_ecall(SBI_EXT_PMU, SBI_EXT_PMU_COUNTER_STOP,
|
|
0, GENMASK_ULL(pmu->num_counters - 1, 0), 0, 0, 0, 0);
|
|
}
|
|
|
|
static inline void pmu_sbi_stop_hw_ctrs(struct riscv_pmu *pmu)
|
|
{
|
|
struct cpu_hw_events *cpu_hw_evt = this_cpu_ptr(pmu->hw_events);
|
|
|
|
/* No need to check the error here as we can't do anything about the error */
|
|
sbi_ecall(SBI_EXT_PMU, SBI_EXT_PMU_COUNTER_STOP, 0,
|
|
cpu_hw_evt->used_hw_ctrs[0], 0, 0, 0, 0);
|
|
}
|
|
|
|
/**
|
|
* This function starts all the used counters in two step approach.
|
|
* Any counter that did not overflow can be start in a single step
|
|
* while the overflowed counters need to be started with updated initialization
|
|
* value.
|
|
*/
|
|
static inline void pmu_sbi_start_overflow_mask(struct riscv_pmu *pmu,
|
|
unsigned long ctr_ovf_mask)
|
|
{
|
|
int idx = 0;
|
|
struct cpu_hw_events *cpu_hw_evt = this_cpu_ptr(pmu->hw_events);
|
|
struct perf_event *event;
|
|
unsigned long flag = SBI_PMU_START_FLAG_SET_INIT_VALUE;
|
|
unsigned long ctr_start_mask = 0;
|
|
uint64_t max_period;
|
|
struct hw_perf_event *hwc;
|
|
u64 init_val = 0;
|
|
|
|
ctr_start_mask = cpu_hw_evt->used_hw_ctrs[0] & ~ctr_ovf_mask;
|
|
|
|
/* Start all the counters that did not overflow in a single shot */
|
|
sbi_ecall(SBI_EXT_PMU, SBI_EXT_PMU_COUNTER_START, 0, ctr_start_mask,
|
|
0, 0, 0, 0);
|
|
|
|
/* Reinitialize and start all the counter that overflowed */
|
|
while (ctr_ovf_mask) {
|
|
if (ctr_ovf_mask & 0x01) {
|
|
event = cpu_hw_evt->events[idx];
|
|
hwc = &event->hw;
|
|
max_period = riscv_pmu_ctr_get_width_mask(event);
|
|
init_val = local64_read(&hwc->prev_count) & max_period;
|
|
sbi_ecall(SBI_EXT_PMU, SBI_EXT_PMU_COUNTER_START, idx, 1,
|
|
flag, init_val, 0, 0);
|
|
}
|
|
ctr_ovf_mask = ctr_ovf_mask >> 1;
|
|
idx++;
|
|
}
|
|
}
|
|
|
|
static irqreturn_t pmu_sbi_ovf_handler(int irq, void *dev)
|
|
{
|
|
struct perf_sample_data data;
|
|
struct pt_regs *regs;
|
|
struct hw_perf_event *hw_evt;
|
|
union sbi_pmu_ctr_info *info;
|
|
int lidx, hidx, fidx;
|
|
struct riscv_pmu *pmu;
|
|
struct perf_event *event;
|
|
unsigned long overflow;
|
|
unsigned long overflowed_ctrs = 0;
|
|
struct cpu_hw_events *cpu_hw_evt = dev;
|
|
|
|
if (WARN_ON_ONCE(!cpu_hw_evt))
|
|
return IRQ_NONE;
|
|
|
|
/* Firmware counter don't support overflow yet */
|
|
fidx = find_first_bit(cpu_hw_evt->used_hw_ctrs, RISCV_MAX_COUNTERS);
|
|
event = cpu_hw_evt->events[fidx];
|
|
if (!event) {
|
|
csr_clear(CSR_SIP, SIP_LCOFIP);
|
|
return IRQ_NONE;
|
|
}
|
|
|
|
pmu = to_riscv_pmu(event->pmu);
|
|
pmu_sbi_stop_hw_ctrs(pmu);
|
|
|
|
/* Overflow status register should only be read after counter are stopped */
|
|
overflow = csr_read(CSR_SSCOUNTOVF);
|
|
|
|
/**
|
|
* Overflow interrupt pending bit should only be cleared after stopping
|
|
* all the counters to avoid any race condition.
|
|
*/
|
|
csr_clear(CSR_SIP, SIP_LCOFIP);
|
|
|
|
/* No overflow bit is set */
|
|
if (!overflow)
|
|
return IRQ_NONE;
|
|
|
|
regs = get_irq_regs();
|
|
|
|
for_each_set_bit(lidx, cpu_hw_evt->used_hw_ctrs, RISCV_MAX_COUNTERS) {
|
|
struct perf_event *event = cpu_hw_evt->events[lidx];
|
|
|
|
/* Skip if invalid event or user did not request a sampling */
|
|
if (!event || !is_sampling_event(event))
|
|
continue;
|
|
|
|
info = &pmu_ctr_list[lidx];
|
|
/* Do a sanity check */
|
|
if (!info || info->type != SBI_PMU_CTR_TYPE_HW)
|
|
continue;
|
|
|
|
/* compute hardware counter index */
|
|
hidx = info->csr - CSR_CYCLE;
|
|
/* check if the corresponding bit is set in sscountovf */
|
|
if (!(overflow & (1 << hidx)))
|
|
continue;
|
|
|
|
/*
|
|
* Keep a track of overflowed counters so that they can be started
|
|
* with updated initial value.
|
|
*/
|
|
overflowed_ctrs |= 1 << lidx;
|
|
hw_evt = &event->hw;
|
|
riscv_pmu_event_update(event);
|
|
perf_sample_data_init(&data, 0, hw_evt->last_period);
|
|
if (riscv_pmu_event_set_period(event)) {
|
|
/*
|
|
* Unlike other ISAs, RISC-V don't have to disable interrupts
|
|
* to avoid throttling here. As per the specification, the
|
|
* interrupt remains disabled until the OF bit is set.
|
|
* Interrupts are enabled again only during the start.
|
|
* TODO: We will need to stop the guest counters once
|
|
* virtualization support is added.
|
|
*/
|
|
perf_event_overflow(event, &data, regs);
|
|
}
|
|
}
|
|
pmu_sbi_start_overflow_mask(pmu, overflowed_ctrs);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static int pmu_sbi_starting_cpu(unsigned int cpu, struct hlist_node *node)
|
|
{
|
|
struct riscv_pmu *pmu = hlist_entry_safe(node, struct riscv_pmu, node);
|
|
struct cpu_hw_events *cpu_hw_evt = this_cpu_ptr(pmu->hw_events);
|
|
|
|
/* Enable the access for TIME csr only from the user mode now */
|
|
csr_write(CSR_SCOUNTEREN, 0x2);
|
|
|
|
/* Stop all the counters so that they can be enabled from perf */
|
|
pmu_sbi_stop_all(pmu);
|
|
|
|
if (riscv_isa_extension_available(NULL, SSCOFPMF)) {
|
|
cpu_hw_evt->irq = riscv_pmu_irq;
|
|
csr_clear(CSR_IP, BIT(RV_IRQ_PMU));
|
|
csr_set(CSR_IE, BIT(RV_IRQ_PMU));
|
|
enable_percpu_irq(riscv_pmu_irq, IRQ_TYPE_NONE);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int pmu_sbi_dying_cpu(unsigned int cpu, struct hlist_node *node)
|
|
{
|
|
if (riscv_isa_extension_available(NULL, SSCOFPMF)) {
|
|
disable_percpu_irq(riscv_pmu_irq);
|
|
csr_clear(CSR_IE, BIT(RV_IRQ_PMU));
|
|
}
|
|
|
|
/* Disable all counters access for user mode now */
|
|
csr_write(CSR_SCOUNTEREN, 0x0);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int pmu_sbi_setup_irqs(struct riscv_pmu *pmu, struct platform_device *pdev)
|
|
{
|
|
int ret;
|
|
struct cpu_hw_events __percpu *hw_events = pmu->hw_events;
|
|
struct device_node *cpu, *child;
|
|
struct irq_domain *domain = NULL;
|
|
|
|
if (!riscv_isa_extension_available(NULL, SSCOFPMF))
|
|
return -EOPNOTSUPP;
|
|
|
|
for_each_of_cpu_node(cpu) {
|
|
child = of_get_compatible_child(cpu, "riscv,cpu-intc");
|
|
if (!child) {
|
|
pr_err("Failed to find INTC node\n");
|
|
return -ENODEV;
|
|
}
|
|
domain = irq_find_host(child);
|
|
of_node_put(child);
|
|
if (domain)
|
|
break;
|
|
}
|
|
if (!domain) {
|
|
pr_err("Failed to find INTC IRQ root domain\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
riscv_pmu_irq = irq_create_mapping(domain, RV_IRQ_PMU);
|
|
if (!riscv_pmu_irq) {
|
|
pr_err("Failed to map PMU interrupt for node\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
ret = request_percpu_irq(riscv_pmu_irq, pmu_sbi_ovf_handler, "riscv-pmu", hw_events);
|
|
if (ret) {
|
|
pr_err("registering percpu irq failed [%d]\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int pmu_sbi_device_probe(struct platform_device *pdev)
|
|
{
|
|
struct riscv_pmu *pmu = NULL;
|
|
int num_counters;
|
|
int ret = -ENODEV;
|
|
|
|
pr_info("SBI PMU extension is available\n");
|
|
pmu = riscv_pmu_alloc();
|
|
if (!pmu)
|
|
return -ENOMEM;
|
|
|
|
num_counters = pmu_sbi_find_num_ctrs();
|
|
if (num_counters < 0) {
|
|
pr_err("SBI PMU extension doesn't provide any counters\n");
|
|
goto out_free;
|
|
}
|
|
|
|
/* cache all the information about counters now */
|
|
if (pmu_sbi_get_ctrinfo(num_counters))
|
|
goto out_free;
|
|
|
|
ret = pmu_sbi_setup_irqs(pmu, pdev);
|
|
if (ret < 0) {
|
|
pr_info("Perf sampling/filtering is not supported as sscof extension is not available\n");
|
|
pmu->pmu.capabilities |= PERF_PMU_CAP_NO_INTERRUPT;
|
|
pmu->pmu.capabilities |= PERF_PMU_CAP_NO_EXCLUDE;
|
|
}
|
|
pmu->num_counters = num_counters;
|
|
pmu->ctr_start = pmu_sbi_ctr_start;
|
|
pmu->ctr_stop = pmu_sbi_ctr_stop;
|
|
pmu->event_map = pmu_sbi_event_map;
|
|
pmu->ctr_get_idx = pmu_sbi_ctr_get_idx;
|
|
pmu->ctr_get_width = pmu_sbi_ctr_get_width;
|
|
pmu->ctr_clear_idx = pmu_sbi_ctr_clear_idx;
|
|
pmu->ctr_read = pmu_sbi_ctr_read;
|
|
|
|
ret = cpuhp_state_add_instance(CPUHP_AP_PERF_RISCV_STARTING, &pmu->node);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = perf_pmu_register(&pmu->pmu, "cpu", PERF_TYPE_RAW);
|
|
if (ret) {
|
|
cpuhp_state_remove_instance(CPUHP_AP_PERF_RISCV_STARTING, &pmu->node);
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
|
|
out_free:
|
|
kfree(pmu);
|
|
return ret;
|
|
}
|
|
|
|
static struct platform_driver pmu_sbi_driver = {
|
|
.probe = pmu_sbi_device_probe,
|
|
.driver = {
|
|
.name = RISCV_PMU_PDEV_NAME,
|
|
},
|
|
};
|
|
|
|
static int __init pmu_sbi_devinit(void)
|
|
{
|
|
int ret;
|
|
struct platform_device *pdev;
|
|
|
|
if (sbi_spec_version < sbi_mk_version(0, 3) ||
|
|
sbi_probe_extension(SBI_EXT_PMU) <= 0) {
|
|
return 0;
|
|
}
|
|
|
|
ret = cpuhp_setup_state_multi(CPUHP_AP_PERF_RISCV_STARTING,
|
|
"perf/riscv/pmu:starting",
|
|
pmu_sbi_starting_cpu, pmu_sbi_dying_cpu);
|
|
if (ret) {
|
|
pr_err("CPU hotplug notifier could not be registered: %d\n",
|
|
ret);
|
|
return ret;
|
|
}
|
|
|
|
ret = platform_driver_register(&pmu_sbi_driver);
|
|
if (ret)
|
|
return ret;
|
|
|
|
pdev = platform_device_register_simple(RISCV_PMU_PDEV_NAME, -1, NULL, 0);
|
|
if (IS_ERR(pdev)) {
|
|
platform_driver_unregister(&pmu_sbi_driver);
|
|
return PTR_ERR(pdev);
|
|
}
|
|
|
|
/* Notify legacy implementation that SBI pmu is available*/
|
|
riscv_pmu_legacy_skip_init();
|
|
|
|
return ret;
|
|
}
|
|
device_initcall(pmu_sbi_devinit)
|