driver/perf: Add identifier sysfs file for Yitian 710 DDR

To allow userspace to identify the specific implementation of the device,
add an "identifier" sysfs file.

The perf tool can match the Yitian 710 DDR metric through the identifier.

Signed-off-by: Jing Zhang <renyu.zj@linux.alibaba.com>
Acked-by: Ian Rogers <irogers@google.com>
Reviewed-by: Shuai Xue <xueshuai@linux.alibaba.com>
Link: https://lore.kernel.org/r/1687245156-61215-2-git-send-email-renyu.zj@linux.alibaba.com
Signed-off-by: Will Deacon <will@kernel.org>

diff --git a/drivers/perf/alibaba_uncore_drw_pmu.c b/drivers/perf/alibaba_uncore_drw_pmu.c
index 5c5be9fc1b15fc0f1cb44d04681eebff5a089f11..19d459a36be55c900e7860b0d8b65dec4a2ec266 100644 (file)
--- a/drivers/perf/alibaba_uncore_drw_pmu.c
+++ b/drivers/perf/alibaba_uncore_drw_pmu.c
@@ -236,10 +236,37 @@ static const struct attribute_group ali_drw_pmu_cpumask_attr_group = {
        .attrs = ali_drw_pmu_cpumask_attrs,
 };
 
+static ssize_t ali_drw_pmu_identifier_show(struct device *dev,
+                                       struct device_attribute *attr,
+                                       char *page)
+{
+       return sysfs_emit(page, "%s\n", "ali_drw_pmu");
+}
+
+static umode_t ali_drw_pmu_identifier_attr_visible(struct kobject *kobj,
+                                               struct attribute *attr, int n)
+{
+       return attr->mode;
+}
+
+static struct device_attribute ali_drw_pmu_identifier_attr =
+       __ATTR(identifier, 0444, ali_drw_pmu_identifier_show, NULL);
+
+static struct attribute *ali_drw_pmu_identifier_attrs[] = {
+       &ali_drw_pmu_identifier_attr.attr,
+       NULL
+};
+
+static const struct attribute_group ali_drw_pmu_identifier_attr_group = {
+       .attrs = ali_drw_pmu_identifier_attrs,
+       .is_visible = ali_drw_pmu_identifier_attr_visible
+};
+
 static const struct attribute_group *ali_drw_pmu_attr_groups[] = {
        &ali_drw_pmu_events_attr_group,
        &ali_drw_pmu_cpumask_attr_group,
        &ali_drw_pmu_format_group,
+       &ali_drw_pmu_identifier_attr_group,
        NULL,
 };