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authorJoakim Zhang <qiangqing.zhang@nxp.com>2019-11-04 07:09:24 +0000
committerWill Deacon <will@kernel.org>2019-11-04 17:25:16 +0000
commitf1d303a1b5dd75d18734a2ca56ca90691639a79d (patch)
tree5c01577671f7fc3cdd18f15990d0c409b6beddeb /drivers/perf
parented0207a33adda11db88c9c3b6066f0c6051119fe (diff)
downloadlinux-f1d303a1b5dd75d18734a2ca56ca90691639a79d.tar.bz2
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>
Diffstat (limited to 'drivers/perf')
-rw-r--r--drivers/perf/fsl_imx8_ddr_perf.c56
1 files changed, 56 insertions, 0 deletions
diff --git a/drivers/perf/fsl_imx8_ddr_perf.c b/drivers/perf/fsl_imx8_ddr_perf.c
index 3bbf806209a6..55083c67b2bb 100644
--- a/drivers/perf/fsl_imx8_ddr_perf.c
+++ b/drivers/perf/fsl_imx8_ddr_perf.c
@@ -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,
};