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>

diff --git a/drivers/perf/riscv_pmu_sbi.c b/drivers/perf/riscv_pmu_sbi.c
index adc910e..06fefcc 100644 (file)
--- 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;