Messages in this thread Patch in this message | | | From | Nikita Shubin <> | Subject | [PATCH v4 1/5] drivers/perf: riscv_pmu_sbi: perf format | Date | Fri, 24 Jun 2022 19:00:51 +0300 |
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From: Nikita Shubin <n.shubin@yadro.com>
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
Inspired-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 --- drivers/perf/riscv_pmu_sbi.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+)
diff --git a/drivers/perf/riscv_pmu_sbi.c b/drivers/perf/riscv_pmu_sbi.c index dca3537a8dcc..2b5861a10d8e 100644 --- a/drivers/perf/riscv_pmu_sbi.c +++ b/drivers/perf/riscv_pmu_sbi.c @@ -21,6 +21,25 @@ #include <asm/sbi.h> #include <asm/hwcap.h> +PMU_FORMAT_ATTR(event, "config:0-62"); +PMU_FORMAT_ATTR(firmware, "config:63-63"); + +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 { @@ -720,6 +739,7 @@ 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; -- 2.35.1
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