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| author | Nikita Shubin <n.shubin@yadro.com> | 2022-06-28 14:45:55 +0300 |
|---|---|---|
| committer | Will Deacon <will@kernel.org> | 2022-07-06 11:06:24 +0100 |
| commit | 26fabd6d2ffc2812138a613bec84ec72541842e7 (patch) | |
| tree | 2ee64cc4cc7a2e6c7492cfa702def654493837ff /drivers/perf/riscv_pmu_sbi.c | |
| parent | 0e35850b341e88055ca11cad74efa464b2159984 (diff) | |
| download | lwn-26fabd6d2ffc2812138a613bec84ec72541842e7.tar.gz lwn-26fabd6d2ffc2812138a613bec84ec72541842e7.zip | |
drivers/perf: riscv_pmu_sbi: perf format
Update driver to export formatting and event information to sysfs so it
can be used by the perf user space tools with the syntaxes:
perf stat -e cpu/event=0x05
perf stat -e cpu/event=0x05,firmware=0x1/
63-bit is used to distinguish hardware events from firmware. Firmware
events are defined by "RISC-V Supervisor Binary Interface
Specification".
perf stat -e cpu/event=0x05,firmware=0x1/
is equivalent to
perf stat -e r8000000000000005
Suggested-by: João Mário Domingos <joao.mario@tecnico.ulisboa.pt>
Signed-off-by: Nikita Shubin <n.shubin@yadro.com>
Link: https://github.com/riscv-non-isa/riscv-sbi-doc/blob/master/riscv-sbi.adoc
Link: https://lore.kernel.org/r/20220628114625.166665-2-nikita.shubin@maquefel.me
Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'drivers/perf/riscv_pmu_sbi.c')
| -rw-r--r-- | drivers/perf/riscv_pmu_sbi.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/drivers/perf/riscv_pmu_sbi.c b/drivers/perf/riscv_pmu_sbi.c index adc910e0f1e2..06fefcccf379 100644 --- a/drivers/perf/riscv_pmu_sbi.c +++ b/drivers/perf/riscv_pmu_sbi.c @@ -22,6 +22,25 @@ #include <asm/sbi.h> #include <asm/hwcap.h> +PMU_FORMAT_ATTR(event, "config:0-47"); +PMU_FORMAT_ATTR(firmware, "config:63"); + +static struct attribute *riscv_arch_formats_attr[] = { + &format_attr_event.attr, + &format_attr_firmware.attr, + NULL, +}; + +static struct attribute_group riscv_pmu_format_group = { + .name = "format", + .attrs = riscv_arch_formats_attr, +}; + +static const struct attribute_group *riscv_pmu_attr_groups[] = { + &riscv_pmu_format_group, + NULL, +}; + union sbi_pmu_ctr_info { unsigned long value; struct { @@ -788,6 +807,7 @@ static int pmu_sbi_device_probe(struct platform_device *pdev) pmu->pmu.capabilities |= PERF_PMU_CAP_NO_INTERRUPT; pmu->pmu.capabilities |= PERF_PMU_CAP_NO_EXCLUDE; } + pmu->pmu.attr_groups = riscv_pmu_attr_groups; pmu->num_counters = num_counters; pmu->ctr_start = pmu_sbi_ctr_start; pmu->ctr_stop = pmu_sbi_ctr_stop; |