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perf: arm_spe: Expose event filter

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Expose an "event_filter" entry in the caps folder to inform user space
about which events can be filtered.

Change the return type of arm_spe_pmu_cap_get() from u32 to u64 to
accommodate the added event filter entry.

Signed-off-by: Leo Yan <leo.yan@arm.com>
Tested-by: Leo Yan <leo.yan@arm.com>
Signed-off-by: James Clark <james.clark@linaro.org>
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Leo Yan
2025-09-01 13:40:32 +01:00
committed by Will Deacon
parent b4401403af
commit 51b9f16697
1 changed files with 20 additions and 2 deletions
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22
drivers/perf/arm_spe_pmu.c
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@@ -116,6 +116,7 @@ enum arm_spe_pmu_capabilities {
SPE_PMU_CAP_FEAT_MAX,
SPE_PMU_CAP_CNT_SZ = SPE_PMU_CAP_FEAT_MAX,
SPE_PMU_CAP_MIN_IVAL,
SPE_PMU_CAP_EVENT_FILTER,
};
static int arm_spe_pmu_feat_caps[SPE_PMU_CAP_FEAT_MAX] = {
@@ -123,7 +124,7 @@ static int arm_spe_pmu_feat_caps[SPE_PMU_CAP_FEAT_MAX] = {
[SPE_PMU_CAP_ERND] = SPE_PMU_FEAT_ERND,
};
static u32 arm_spe_pmu_cap_get(struct arm_spe_pmu *spe_pmu, int cap)
static u64 arm_spe_pmu_cap_get(struct arm_spe_pmu *spe_pmu, int cap)
{
if (cap < SPE_PMU_CAP_FEAT_MAX)
return !!(spe_pmu->features & arm_spe_pmu_feat_caps[cap]);
@@ -133,6 +134,8 @@ static u32 arm_spe_pmu_cap_get(struct arm_spe_pmu *spe_pmu, int cap)
return spe_pmu->counter_sz;
case SPE_PMU_CAP_MIN_IVAL:
return spe_pmu->min_period;
case SPE_PMU_CAP_EVENT_FILTER:
return ~spe_pmu->pmsevfr_res0;
default:
WARN(1, "unknown cap %d\n", cap);
}
@@ -149,7 +152,19 @@ static ssize_t arm_spe_pmu_cap_show(struct device *dev,
container_of(attr, struct dev_ext_attribute, attr);
int cap = (long)ea->var;
return sysfs_emit(buf, "%u\n", arm_spe_pmu_cap_get(spe_pmu, cap));
return sysfs_emit(buf, "%llu\n", arm_spe_pmu_cap_get(spe_pmu, cap));
}
static ssize_t arm_spe_pmu_cap_show_hex(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct arm_spe_pmu *spe_pmu = dev_get_drvdata(dev);
struct dev_ext_attribute *ea =
container_of(attr, struct dev_ext_attribute, attr);
int cap = (long)ea->var;
return sysfs_emit(buf, "0x%llx\n", arm_spe_pmu_cap_get(spe_pmu, cap));
}
#define SPE_EXT_ATTR_ENTRY(_name, _func, _var) \
@@ -159,12 +174,15 @@ static ssize_t arm_spe_pmu_cap_show(struct device *dev,
#define SPE_CAP_EXT_ATTR_ENTRY(_name, _var) \
SPE_EXT_ATTR_ENTRY(_name, arm_spe_pmu_cap_show, _var)
#define SPE_CAP_EXT_ATTR_ENTRY_HEX(_name, _var) \
SPE_EXT_ATTR_ENTRY(_name, arm_spe_pmu_cap_show_hex, _var)
static struct attribute *arm_spe_pmu_cap_attr[] = {
SPE_CAP_EXT_ATTR_ENTRY(arch_inst, SPE_PMU_CAP_ARCH_INST),
SPE_CAP_EXT_ATTR_ENTRY(ernd, SPE_PMU_CAP_ERND),
SPE_CAP_EXT_ATTR_ENTRY(count_size, SPE_PMU_CAP_CNT_SZ),
SPE_CAP_EXT_ATTR_ENTRY(min_interval, SPE_PMU_CAP_MIN_IVAL),
SPE_CAP_EXT_ATTR_ENTRY_HEX(event_filter, SPE_PMU_CAP_EVENT_FILTER),
NULL,
};