Messages in this thread Patch in this message | | | From | John Garry <> | Subject | [RFC PATCH] perf/smmuv3: Support sysfs identifier file | Date | Fri, 17 Apr 2020 18:50:34 +0800 |
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For the perf tool to know the specific HW implementation, expose a HW identifier file for the PMU device.
For now, we just support HiSilicon "hip08" through pre-existing ACPI options quirk framework. A minimalistic approach is used, based on the hope that a proper identification method will be available in a future SMMUv3 spec.
Signed-off-by: John Garry <john.garry@huawei.com>
diff --git a/drivers/perf/arm_smmuv3_pmu.c b/drivers/perf/arm_smmuv3_pmu.c index f01a57e5a5f3..0ed358cff4a7 100644 --- a/drivers/perf/arm_smmuv3_pmu.c +++ b/drivers/perf/arm_smmuv3_pmu.c @@ -113,6 +113,7 @@ struct smmu_pmu { u64 counter_mask; u32 options; bool global_filter; + const char *identifier; }; #define to_smmu_pmu(p) (container_of(p, struct smmu_pmu, pmu)) @@ -552,6 +553,27 @@ 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 sprintf(page, "%s\n", smmu_pmu->identifier); +} + +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, +}; + /* Formats */ PMU_FORMAT_ATTR(event, "config:0-15"); PMU_FORMAT_ATTR(filter_stream_id, "config1:0-31"); @@ -575,6 +597,7 @@ 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 }; @@ -718,7 +741,10 @@ static void smmu_pmu_get_acpi_options(struct smmu_pmu *smmu_pmu) case IORT_SMMU_V3_PMCG_HISI_HIP08: /* HiSilicon Erratum 162001800 */ smmu_pmu->options |= SMMU_PMCG_EVCNTR_RDONLY; + smmu_pmu->identifier = "hip08"; break; + default: + smmu_pmu->identifier = "none"; } dev_notice(smmu_pmu->dev, "option mask 0x%x\n", smmu_pmu->options); -- 2.16.4
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