linux-kernel - [PATCH 10/16] perf: provide sysfs_show for struct perf_pmu_events

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Message-Id: <1401236684-10579-11-git-send-email-dev@codyps.com>
Date:	Tue, 27 May 2014 17:22:05 -0700
From:	Cody P Schafer <dev@...yps.com>
To:	LKML <linux-kernel@...r.kernel.org>,
	Linux PPC <linuxppc-dev@...ts.ozlabs.org>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Ingo Molnar <mingo@...hat.com>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>,
	Cody P Schafer <dev@...yps.com>
Subject: [PATCH 10/16] perf: provide sysfs_show for struct perf_pmu_events_attr

(struct perf_pmu_events_attr) is defined in include/linux/perf_event.h,
but the only "show" for it is in x86 and contains x86 specific stuff.

Make a generic one for those of us who are just using the event_str.

CC: Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
Signed-off-by: Cody P Schafer <dev@...yps.com>
---
 include/linux/perf_event.h | 3 +++
 kernel/events/core.c       | 8 ++++++++
 2 files changed, 11 insertions(+)

diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index 3356abc..6c1d6dd 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -867,6 +867,9 @@ struct perf_pmu_events_attr {
 	const char *event_str;
 };
 
+ssize_t perf_event_sysfs_show(struct device *dev, struct device_attribute *attr,
+			      char *page);
+
 #define PMU_EVENT_ATTR(_name, _var, _id, _show)				\
 static struct perf_pmu_events_attr _var = {				\
 	.attr = __ATTR(_name, 0444, _show, NULL),			\
diff --git a/kernel/events/core.c b/kernel/events/core.c
index f83a71a..6830e21 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -7971,6 +7971,14 @@ void __init perf_event_init(void)
 		     != 1024);
 }
 
+ssize_t perf_event_sysfs_show(struct device *dev, struct device_attribute *attr,
+			      char *page)
+{
+	struct perf_pmu_events_attr *pmu_attr =
+		container_of(attr, struct perf_pmu_events_attr, attr);
+	return sprintf(page, "%s\n", pmu_attr->event_str);
+}
+
 static int __init perf_event_sysfs_init(void)
 {
 	struct pmu *pmu;
-- 
1.9.3

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