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authorJohn Garry <john.garry@huawei.com>2020-10-08 11:26:21 +0200
committerWill Deacon <will@kernel.org>2020-11-25 16:10:35 +0100
commit2c255223362e9747075320ba618bd5960b76e04f (patch)
tree15397d01f0861f17c0efd7b4cc5cdcae742bf2ef /drivers/perf
parentdrivers/perf: hisi: Add identifier sysfs file (diff)
downloadlinux-2c255223362e9747075320ba618bd5960b76e04f.tar.xz
linux-2c255223362e9747075320ba618bd5960b76e04f.zip
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.c39
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) {