linux-kernel - [PATCH 1/9] perf: Add EVENT_ATTR_ID to simplify event attributes

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Message-ID: <1621322628-9945-2-git-send-email-liuqi115@huawei.com>
Date:   Tue, 18 May 2021 15:23:40 +0800
From:   Qi Liu <liuqi115@...wei.com>
To:     <will@...nel.org>, <mark.rutland@....com>, <john.garry@...wei.com>
CC:     <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <linuxarm@...wei.com>,
        <zhangshaokun@...ilicon.com>
Subject: [PATCH 1/9] perf: Add EVENT_ATTR_ID to simplify event attributes

Similar EVENT_ATTR macros are defined in many PMU drivers,
like HiSilicon PMU driver, Arm PMU driver, Arm SMMU PMU
driver. So Add a generic macro to simplify code.

Signed-off-by: Qi Liu <liuqi115@...wei.com>
---
 include/linux/perf_event.h | 6 ++++++
 kernel/events/core.c       | 2 ++
 2 files changed, 8 insertions(+)

diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index f5a6a2f..d0aa74e 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -1576,6 +1576,12 @@ static struct perf_pmu_events_attr _var = {				    \
 	.event_str	= _str,						    \
 };
 
+#define PMU_EVENT_ATTR_ID(_name, _id)					     \
+	(&((struct perf_pmu_events_attr[]) {				     \
+		{ .attr = __ATTR(_name, 0444, perf_event_sysfs_show, NULL),  \
+		  .id = _id, }						     \
+	})[0].attr.attr)
+
 #define PMU_FORMAT_ATTR(_name, _format)					\
 static ssize_t								\
 _name##_show(struct device *dev,					\
diff --git a/kernel/events/core.c b/kernel/events/core.c
index 0ac818b..330d9cc 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -13295,6 +13295,8 @@ ssize_t perf_event_sysfs_show(struct device *dev, struct device_attribute *attr,
 
 	if (pmu_attr->event_str)
 		return sprintf(page, "%s\n", pmu_attr->event_str);
+	else
+		return sprintf(page, "config=%#llx\n", pmu_attr->id);
 
 	return 0;
 }
-- 
2.7.4