Commit 881b0520 authored by Joakim Zhang's avatar Joakim Zhang Committed by Will Deacon
Browse files

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: default avatarJoakim Zhang <qiangqing.zhang@nxp.com>
Reviewed-by: default avatarJohn Garry <john.garry@huawei.com>
Link: https://lore.kernel.org/r/20201130114202.26057-3-qiangqing.zhang@nxp.com


Signed-off-by: default avatarWill Deacon <will@kernel.org>
parent d0c00977

drivers/perf/fsl_imx8_ddr_perf.c

+55 −0
Original line number Diff line number Diff line
@@ -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,

};