The DDR Perf for i.MX8 is a system PMU whose axi id would different from SoC to SoC. Need expose system PMU identifier for userspace which refer to /sys/bus/event_source/devices/<PMU DEVICE>/identifier.
Signed-off-by: Joakim Zhang <[email protected]> --- drivers/perf/fsl_imx8_ddr_perf.c | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) diff --git a/drivers/perf/fsl_imx8_ddr_perf.c b/drivers/perf/fsl_imx8_ddr_perf.c index 90884d14f95f..ba523a94f4d7 100644 --- a/drivers/perf/fsl_imx8_ddr_perf.c +++ b/drivers/perf/fsl_imx8_ddr_perf.c @@ -76,6 +76,7 @@ struct ddr_pmu { unsigned int cpu; struct hlist_node node; struct device *dev; + const char *identifier; struct perf_event *events[NUM_COUNTERS]; int active_events; enum cpuhp_state cpuhp_state; @@ -84,6 +85,27 @@ struct ddr_pmu { int id; }; +static ssize_t ddr_perf_identifier_show(struct device *dev, + struct device_attribute *attr, + char *page) +{ + struct ddr_pmu *pmu = dev_get_drvdata(dev); + + return sprintf(page, "%s\n", pmu->identifier); +} + +static struct device_attribute ddr_perf_identifier_attr = + __ATTR(identifier, 0444, ddr_perf_identifier_show, NULL); + +static struct attribute *ddr_perf_identifier_attrs[] = { + &ddr_perf_identifier_attr.attr, + NULL, +}; + +static struct attribute_group ddr_perf_identifier_attr_group = { + .attrs = ddr_perf_identifier_attrs, +}; + enum ddr_perf_filter_capabilities { PERF_CAP_AXI_ID_FILTER = 0, PERF_CAP_AXI_ID_FILTER_ENHANCED, @@ -237,6 +259,7 @@ static const struct attribute_group *attr_groups[] = { &ddr_perf_format_attr_group, &ddr_perf_cpumask_attr_group, &ddr_perf_filter_cap_attr_group, + &ddr_perf_identifier_attr_group, NULL, }; @@ -601,6 +624,7 @@ static int ddr_perf_probe(struct platform_device *pdev) struct ddr_pmu *pmu; struct device_node *np; void __iomem *base; + const char *identifier = NULL; char *name; int num; int ret; @@ -620,6 +644,11 @@ static int ddr_perf_probe(struct platform_device *pdev) platform_set_drvdata(pdev, pmu); + ret = of_property_read_string(np, "identifier", &identifier); + if (ret < 0) + dev_warn(&pdev->dev, "Failed to get identifier\n"); + pmu->identifier = identifier; + name = devm_kasprintf(&pdev->dev, GFP_KERNEL, DDR_PERF_DEV_NAME "%d", num); if (!name) -- 2.17.1
