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perf/imx_ddr: Dump AXI ID filter info to userspace 

caps/filter indicates whether HW supports AXI ID filter or not.
caps/enhanced_filter indicates whether HW supports enhanced AXI ID filter
or not.

Users can check filter features from userspace with these attributions.

Suggested-by: Will Deacon <will@kernel.org>
Signed-off-by: Joakim Zhang <qiangqing.zhang@nxp.com>
[will: reworked cap switch to be less error-prone]
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Joakim Zhang 2019-11-04 07:09:24 +00:00 committed by Will Deacon
parent ed0207a33a
commit f1d303a1b5
1 changed files with 56 additions and 0 deletions
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56
drivers/perf/fsl_imx8_ddr_perf.c
View File

@ -84,6 +84,61 @@ struct ddr_pmu {
int id;
};
enum ddr_perf_filter_capabilities {
PERF_CAP_AXI_ID_FILTER = 0,
PERF_CAP_AXI_ID_FILTER_ENHANCED,
PERF_CAP_AXI_ID_FEAT_MAX,
};
static u32 ddr_perf_filter_cap_get(struct ddr_pmu *pmu, int cap)
{
u32 quirks = pmu->devtype_data->quirks;
switch (cap) {
case PERF_CAP_AXI_ID_FILTER:
return !!(quirks & DDR_CAP_AXI_ID_FILTER);
case PERF_CAP_AXI_ID_FILTER_ENHANCED:
quirks &= DDR_CAP_AXI_ID_FILTER_ENHANCED;
return quirks == DDR_CAP_AXI_ID_FILTER_ENHANCED;
default:
WARN(1, "unknown filter cap %d\n", cap);
}
return 0;
}
static ssize_t ddr_perf_filter_cap_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct ddr_pmu *pmu = dev_get_drvdata(dev);
struct dev_ext_attribute *ea =
container_of(attr, struct dev_ext_attribute, attr);
int cap = (long)ea->var;
return snprintf(buf, PAGE_SIZE, "%u\n",
ddr_perf_filter_cap_get(pmu, cap));
}
#define PERF_EXT_ATTR_ENTRY(_name, _func, _var) \
(&((struct dev_ext_attribute) { \
__ATTR(_name, 0444, _func, NULL), (void *)_var \
}).attr.attr)
#define PERF_FILTER_EXT_ATTR_ENTRY(_name, _var) \
PERF_EXT_ATTR_ENTRY(_name, ddr_perf_filter_cap_show, _var)
static struct attribute *ddr_perf_filter_cap_attr[] = {
PERF_FILTER_EXT_ATTR_ENTRY(filter, PERF_CAP_AXI_ID_FILTER),
PERF_FILTER_EXT_ATTR_ENTRY(enhanced_filter, PERF_CAP_AXI_ID_FILTER_ENHANCED),
NULL,
};
static struct attribute_group ddr_perf_filter_cap_attr_group = {
.name = "caps",
.attrs = ddr_perf_filter_cap_attr,
};
static ssize_t ddr_perf_cpumask_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
@ -181,6 +236,7 @@ static const struct attribute_group *attr_groups[] = {
&ddr_perf_events_attr_group,
&ddr_perf_format_attr_group,
&ddr_perf_cpumask_attr_group,
&ddr_perf_filter_cap_attr_group,
NULL,
};