Messages in this thread Patch in this message | | | From | Jing Zhang <> | Subject | [PATCH RFC 1/4] driver/perf: Add identifier sysfs file for CMN | Date | Mon, 27 Mar 2023 10:46:09 +0800 |
| |
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 | 43 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 43 insertions(+)
diff --git a/drivers/perf/arm-cmn.c b/drivers/perf/arm-cmn.c index c968986..0c138ad 100644 --- a/drivers/perf/arm-cmn.c +++ b/drivers/perf/arm-cmn.c @@ -1168,10 +1168,53 @@ 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)); + if (cmn->model == CMN700) { + return sysfs_emit(buf, "%s\n", "CMN700"); + } + else if (cmn->model == CMN650) { + return sysfs_emit(buf, "%s\n", "CMN650"); + } + else if (cmn->model == CMN600) { + return sysfs_emit(buf, "%s\n", "CMN600"); + } + else if (cmn->model == CI700) { + return sysfs_emit(buf, "%s\n", "CI700"); + } + return sysfs_emit(buf, "%s\n", "UNKNOWN"); +} + +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->model <= 0) + 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 }; -- 1.8.3.1
| |