Commit 26fabd6d authored by Nikita Shubin's avatar Nikita Shubin Committed by Will Deacon
Browse files

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: default avatarJoão Mário Domingos <joao.mario@tecnico.ulisboa.pt>
Signed-off-by: default avatarNikita 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: default avatarWill Deacon <will@kernel.org>
parent 0e35850b

drivers/perf/riscv_pmu_sbi.c

+20 −0
Original line number Diff line number Diff line
@@ -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;