diff options
| author | John Garry | 2020-10-08 17:26:21 +0800 |
|---|---|---|
| committer | Will Deacon | 2020-11-25 15:10:35 +0000 |
| commit | 2c255223362e9747075320ba618bd5960b76e04f (patch) | |
| tree | 15397d01f0861f17c0efd7b4cc5cdcae742bf2ef /drivers/perf | |
| parent | ac4511c9364c9a6390e8585cdd4596103bca16eb (diff) | |
perf/smmuv3: Support sysfs identifier file
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>
Diffstat (limited to 'drivers/perf')
| -rw-r--r-- | drivers/perf/arm_smmuv3_pmu.c | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/drivers/perf/arm_smmuv3_pmu.c b/drivers/perf/arm_smmuv3_pmu.c index 5274f7fe359e..74474bb322c3 100644 --- a/drivers/perf/arm_smmuv3_pmu.c +++ b/drivers/perf/arm_smmuv3_pmu.c @@ -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) { |