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.
Reviewed-by: John Garry <john.garry@xxxxxxxxxx>
Signed-off-by: Joakim Zhang <qiangqing.zhang@xxxxxxx>
---
drivers/perf/fsl_imx8_ddr_perf.c | 45 +++++++++++++++++++++++++++++---
1 file changed, 42 insertions(+), 3 deletions(-)
diff --git a/drivers/perf/fsl_imx8_ddr_perf.c b/drivers/perf/fsl_imx8_ddr_perf.c
index 95dca2cb5265..88addbffbbd0 100644
--- a/drivers/perf/fsl_imx8_ddr_perf.c
+++ b/drivers/perf/fsl_imx8_ddr_perf.c
@@ -50,21 +50,38 @@ static DEFINE_IDA(ddr_ida);
struct fsl_ddr_devtype_data {
unsigned int quirks; /* quirks needed for different DDR Perf core */
+ const char *identifier; /* system PMU identifier for userspace */
};
-static const struct fsl_ddr_devtype_data imx8_devtype_data;
+static const struct fsl_ddr_devtype_data imx8_devtype_data = {
+ .identifier = "i.MX8",
+};
+
+static const struct fsl_ddr_devtype_data imx8mq_devtype_data = {
+ .quirks = DDR_CAP_AXI_ID_FILTER,
+ .identifier = "i.MX8MQ",
+};
+
+static const struct fsl_ddr_devtype_data imx8mm_devtype_data = {
+ .quirks = DDR_CAP_AXI_ID_FILTER,
+ .identifier = "i.MX8MM",
+};
-static const struct fsl_ddr_devtype_data imx8m_devtype_data = {
+static const struct fsl_ddr_devtype_data imx8mn_devtype_data = {
.quirks = DDR_CAP_AXI_ID_FILTER,
+ .identifier = "i.MX8MN",
};
static const struct fsl_ddr_devtype_data imx8mp_devtype_data = {
.quirks = DDR_CAP_AXI_ID_FILTER_ENHANCED,
+ .identifier = "i.MX8MP",
};
static const struct of_device_id imx_ddr_pmu_dt_ids[] = {
{ .compatible = "fsl,imx8-ddr-pmu", .data = &imx8_devtype_data},
- { .compatible = "fsl,imx8m-ddr-pmu", .data = &imx8m_devtype_data},
+ { .compatible = "fsl,imx8mq-ddr-pmu", .data = &imx8mq_devtype_data},
+ { .compatible = "fsl,imx8mm-ddr-pmu", .data = &imx8mm_devtype_data},
+ { .compatible = "fsl,imx8mn-ddr-pmu", .data = &imx8mn_devtype_data},
{ .compatible = "fsl,imx8mp-ddr-pmu", .data = &imx8mp_devtype_data},
{ /* sentinel */ }
};
@@ -84,6 +101,27 @@ 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->devtype_data->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 +275,7 @@ 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,
};
--
2.17.1
