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Subject[PATCH v4 1/5] drivers/perf: riscv_pmu_sbi: perf format
Date
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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