Messages in this thread Patch in this message | | | From | Jing Zhang <> | Subject | [PATCH v2 1/5] driver/perf: Add identifier sysfs file for CMN | Date | Mon, 24 Apr 2023 17:44:12 +0800 |
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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@linux.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
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