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>

diff --git a/drivers/perf/fsl_imx8_ddr_perf.c b/drivers/perf/fsl_imx8_ddr_perf.c
index 3bbf806..55083c6 100644 (file)
--- 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,
 };