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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>
This commit is contained in:
Joakim Zhang 2020-11-30 19:42:02 +08:00 committed by Will Deacon
parent d0c00977a1
commit 881b052050
1 changed files with 55 additions and 0 deletions
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55
drivers/perf/fsl_imx8_ddr_perf.c
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@ -50,6 +50,7 @@ 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;
@ -58,13 +59,32 @@ static const struct fsl_ddr_devtype_data imx8m_devtype_data = {
.quirks = DDR_CAP_AXI_ID_FILTER,
};
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 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 +104,40 @@ 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 umode_t ddr_perf_identifier_attr_visible(struct kobject *kobj,
struct attribute *attr,
int n)
{
struct device *dev = kobj_to_dev(kobj);
struct ddr_pmu *pmu = dev_get_drvdata(dev);
if (!pmu->devtype_data->identifier)
return 0;
return attr->mode;
};
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,
.is_visible = ddr_perf_identifier_attr_visible,
};
enum ddr_perf_filter_capabilities {
PERF_CAP_AXI_ID_FILTER = 0,
PERF_CAP_AXI_ID_FILTER_ENHANCED,
@ -237,6 +291,7 @@ 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,
};