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perf/smmuv3: Support sysfs identifier file

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SMMU_PMCG_IIDR was added in the SMMUv3.3 spec.

For the perf tool to know the specific HW implementation, expose the
PMCG_IIDR contents only when set.

Signed-off-by: John Garry <john.garry@huawei.com>
Link: https://lore.kernel.org/r/1602149181-237415-5-git-send-email-john.garry@huawei.com
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
John Garry 2020-10-08 17:26:21 +08:00 committed by Will Deacon
parent ac4511c936
commit 2c25522336
1 changed files with 39 additions and 0 deletions
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39
drivers/perf/arm_smmuv3_pmu.c
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@ -74,6 +74,7 @@
#define SMMU_PMCG_CFGR_NCTR GENMASK(5, 0)
#define SMMU_PMCG_CR 0xE04
#define SMMU_PMCG_CR_ENABLE BIT(0)
#define SMMU_PMCG_IIDR 0xE08
#define SMMU_PMCG_CEID0 0xE20
#define SMMU_PMCG_CEID1 0xE28
#define SMMU_PMCG_IRQ_CTRL 0xE50
@ -112,6 +113,7 @@ struct smmu_pmu {
void __iomem *reloc_base;
u64 counter_mask;
u32 options;
u32 iidr;
bool global_filter;
};
@ -552,6 +554,40 @@ static struct attribute_group smmu_pmu_events_group = {
.is_visible = smmu_pmu_event_is_visible,
};
static ssize_t smmu_pmu_identifier_attr_show(struct device *dev,
struct device_attribute *attr,
char *page)
{
struct smmu_pmu *smmu_pmu = to_smmu_pmu(dev_get_drvdata(dev));
return snprintf(page, PAGE_SIZE, "0x%08x\n", smmu_pmu->iidr);
}
static umode_t smmu_pmu_identifier_attr_visible(struct kobject *kobj,
struct attribute *attr,
int n)
{
struct device *dev = kobj_to_dev(kobj);
struct smmu_pmu *smmu_pmu = to_smmu_pmu(dev_get_drvdata(dev));
if (!smmu_pmu->iidr)
return 0;
return attr->mode;
}
static struct device_attribute smmu_pmu_identifier_attr =
__ATTR(identifier, 0444, smmu_pmu_identifier_attr_show, NULL);
static struct attribute *smmu_pmu_identifier_attrs[] = {
&smmu_pmu_identifier_attr.attr,
NULL
};
static struct attribute_group smmu_pmu_identifier_group = {
.attrs = smmu_pmu_identifier_attrs,
.is_visible = smmu_pmu_identifier_attr_visible,
};
/* Formats */
PMU_FORMAT_ATTR(event, "config:0-15");
PMU_FORMAT_ATTR(filter_stream_id, "config1:0-31");
@ -575,6 +611,7 @@ static const struct attribute_group *smmu_pmu_attr_grps[] = {
&smmu_pmu_cpumask_group,
&smmu_pmu_events_group,
&smmu_pmu_format_group,
&smmu_pmu_identifier_group,
NULL
};
@ -795,6 +832,8 @@ static int smmu_pmu_probe(struct platform_device *pdev)
return err;
}
smmu_pmu->iidr = readl_relaxed(smmu_pmu->reg_base + SMMU_PMCG_IIDR);
name = devm_kasprintf(&pdev->dev, GFP_KERNEL, "smmuv3_pmcg_%llx",
(res_0->start) >> SMMU_PMCG_PA_SHIFT);
if (!name) {