Commit 2c255223 authored by John Garry's avatar John Garry Committed by Will Deacon
Browse files

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: default avatarJohn Garry <john.garry@huawei.com>
Link: https://lore.kernel.org/r/1602149181-237415-5-git-send-email-john.garry@huawei.com


Signed-off-by: default avatarWill Deacon <will@kernel.org>
parent ac4511c9

drivers/perf/arm_smmuv3_pmu.c

+39 −0
Original line number Diff line number Diff line
@@ -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) {