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perf/imx_ddr: Add system PMU identifier for userspace
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 <qiangqing.zhang@nxp.com> Reviewed-by: John Garry <john.garry@huawei.com> Link: https://lore.kernel.org/r/20201130114202.26057-3-qiangqing.zhang@nxp.com Signed-off-by: Will Deacon <will@kernel.org>
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@ -50,6 +50,7 @@ static DEFINE_IDA(ddr_ida);
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struct fsl_ddr_devtype_data {
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unsigned int quirks; /* quirks needed for different DDR Perf core */
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const char *identifier; /* system PMU identifier for userspace */
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};
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static const struct fsl_ddr_devtype_data imx8_devtype_data;
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@ -58,13 +59,32 @@ static const struct fsl_ddr_devtype_data imx8m_devtype_data = {
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.quirks = DDR_CAP_AXI_ID_FILTER,
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};
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static const struct fsl_ddr_devtype_data imx8mq_devtype_data = {
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.quirks = DDR_CAP_AXI_ID_FILTER,
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.identifier = "i.MX8MQ",
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};
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static const struct fsl_ddr_devtype_data imx8mm_devtype_data = {
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.quirks = DDR_CAP_AXI_ID_FILTER,
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.identifier = "i.MX8MM",
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};
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static const struct fsl_ddr_devtype_data imx8mn_devtype_data = {
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.quirks = DDR_CAP_AXI_ID_FILTER,
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.identifier = "i.MX8MN",
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};
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static const struct fsl_ddr_devtype_data imx8mp_devtype_data = {
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.quirks = DDR_CAP_AXI_ID_FILTER_ENHANCED,
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.identifier = "i.MX8MP",
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};
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static const struct of_device_id imx_ddr_pmu_dt_ids[] = {
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{ .compatible = "fsl,imx8-ddr-pmu", .data = &imx8_devtype_data},
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{ .compatible = "fsl,imx8m-ddr-pmu", .data = &imx8m_devtype_data},
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{ .compatible = "fsl,imx8mq-ddr-pmu", .data = &imx8mq_devtype_data},
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{ .compatible = "fsl,imx8mm-ddr-pmu", .data = &imx8mm_devtype_data},
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{ .compatible = "fsl,imx8mn-ddr-pmu", .data = &imx8mn_devtype_data},
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{ .compatible = "fsl,imx8mp-ddr-pmu", .data = &imx8mp_devtype_data},
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{ /* sentinel */ }
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};
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@ -84,6 +104,40 @@ struct ddr_pmu {
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int id;
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};
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static ssize_t ddr_perf_identifier_show(struct device *dev,
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struct device_attribute *attr,
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char *page)
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{
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struct ddr_pmu *pmu = dev_get_drvdata(dev);
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return sprintf(page, "%s\n", pmu->devtype_data->identifier);
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}
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static umode_t ddr_perf_identifier_attr_visible(struct kobject *kobj,
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struct attribute *attr,
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int n)
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{
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struct device *dev = kobj_to_dev(kobj);
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struct ddr_pmu *pmu = dev_get_drvdata(dev);
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if (!pmu->devtype_data->identifier)
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return 0;
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return attr->mode;
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};
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static struct device_attribute ddr_perf_identifier_attr =
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__ATTR(identifier, 0444, ddr_perf_identifier_show, NULL);
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static struct attribute *ddr_perf_identifier_attrs[] = {
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&ddr_perf_identifier_attr.attr,
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NULL,
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};
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static struct attribute_group ddr_perf_identifier_attr_group = {
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.attrs = ddr_perf_identifier_attrs,
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.is_visible = ddr_perf_identifier_attr_visible,
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};
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enum ddr_perf_filter_capabilities {
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PERF_CAP_AXI_ID_FILTER = 0,
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PERF_CAP_AXI_ID_FILTER_ENHANCED,
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@ -237,6 +291,7 @@ static const struct attribute_group *attr_groups[] = {
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&ddr_perf_format_attr_group,
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&ddr_perf_cpumask_attr_group,
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&ddr_perf_filter_cap_attr_group,
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&ddr_perf_identifier_attr_group,
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NULL,
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};
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