linux-kernel - [PATCH v2 1/5] driver/perf: Add identifier sysfs file for CMN

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Date:   Mon, 24 Apr 2023 17:44:12 +0800
From:   Jing Zhang <renyu.zj@...ux.alibaba.com>
To:     John Garry <john.g.garry@...cle.com>,
        Ian Rogers <irogers@...gle.com>, Will Deacon <will@...nel.org>,
        Shuai Xue <xueshuai@...ux.alibaba.com>
Cc:     James Clark <james.clark@....com>,
        Mike Leach <mike.leach@...aro.org>,
        Leo Yan <leo.yan@...aro.org>,
        Mark Rutland <mark.rutland@....com>,
        Ilkka Koskinen <ilkka@...amperecomputing.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-perf-users@...r.kernel.org,
        Zhuo Song <zhuo.song@...ux.alibaba.com>,
        Jing Zhang <renyu.zj@...ux.alibaba.com>
Subject: [PATCH v2 1/5] driver/perf: Add identifier sysfs file for CMN

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

The perf tool can match the arm CMN metric through the identifier.

Signed-off-by: Jing Zhang <renyu.zj@...ux.alibaba.com>
---
 drivers/perf/arm-cmn.c | 49 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 49 insertions(+)

diff --git a/drivers/perf/arm-cmn.c b/drivers/perf/arm-cmn.c
index c968986..f425610 100644
--- a/drivers/perf/arm-cmn.c
+++ b/drivers/perf/arm-cmn.c
@@ -334,6 +334,7 @@ struct arm_cmn {
 
 	struct pmu pmu;
 	struct dentry *debug;
+	const char *identifier;
 };
 
 #define to_cmn(p)	container_of(p, struct arm_cmn, pmu)
@@ -1168,10 +1169,41 @@ static ssize_t arm_cmn_cpumask_show(struct device *dev,
 	.attrs = arm_cmn_cpumask_attrs,
 };
 
+static ssize_t arm_cmn_identifier_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct arm_cmn *cmn = to_cmn(dev_get_drvdata(dev));
+
+	return sysfs_emit(buf, "%s\n", cmn->identifier);
+}
+
+static umode_t arm_cmn_identifier_attr_visible(struct kobject *kobj,
+		struct attribute *attr, int n)
+{
+	struct device *dev = kobj_to_dev(kobj);
+	struct arm_cmn *cmn = to_cmn(dev_get_drvdata(dev));
+
+	if (cmn->identifier == NULL)
+		return 0;
+	return attr->mode;
+};
+
+static struct device_attribute arm_cmn_identifier_attr =
+__ATTR(identifier, 0444, arm_cmn_identifier_show, NULL);
+
+static struct attribute *arm_cmn_identifier_attrs[] = {
+	&arm_cmn_identifier_attr.attr,
+	NULL
+};
+
+static struct attribute_group arm_cmn_identifier_attr_group = {
+	.attrs = arm_cmn_identifier_attrs,
+	.is_visible = arm_cmn_identifier_attr_visible
+};
+
 static const struct attribute_group *arm_cmn_attr_groups[] = {
 	&arm_cmn_event_attrs_group,
 	&arm_cmn_format_attrs_group,
 	&arm_cmn_cpumask_attr_group,
+	&arm_cmn_identifier_attr_group,
 	NULL
 };
 
@@ -2241,6 +2273,22 @@ static int arm_cmn600_of_probe(struct device_node *np)
 	return of_property_read_u32(np, "arm,root-node", &rootnode) ?: rootnode;
 }
 
+const char *arm_cmn_identifier(unsigned long model)
+{
+	switch (model) {
+	case CMN600:
+		return "cmn600";
+	case CMN650:
+		return "cmn650";
+	case CMN700:
+		return "cmn700";
+	case CI700:
+		return "ci700";
+	default:
+		return NULL;
+	}
+}
+
 static int arm_cmn_probe(struct platform_device *pdev)
 {
 	struct arm_cmn *cmn;
@@ -2254,6 +2302,7 @@ static int arm_cmn_probe(struct platform_device *pdev)
 
 	cmn->dev = &pdev->dev;
 	cmn->model = (unsigned long)device_get_match_data(cmn->dev);
+	cmn->identifier = arm_cmn_identifier(cmn->model);
 	platform_set_drvdata(pdev, cmn);
 
 	if (cmn->model == CMN600 && has_acpi_companion(cmn->dev)) {
-- 
1.8.3.1