linux-kernel - [tip:perf/core] perf/core: Let userspace know if the PMU supports address filters

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Date:	Thu, 5 May 2016 02:47:38 -0700
From:	tip-bot for Alexander Shishkin <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, eranian@...gle.com,
	vincent.weaver@...ne.edu, tglx@...utronix.de, bp@...en8.de,
	linux-kernel@...r.kernel.org, mathieu.poirier@...aro.org,
	hpa@...or.com, peterz@...radead.org, acme@...hat.com,
	jolsa@...hat.com, alexander.shishkin@...ux.intel.com,
	mingo@...nel.org, acme@...radead.org
Subject: [tip:perf/core] perf/core: Let userspace know if the PMU supports
 address filters

Commit-ID:  6e855cd4f4b5258016cf707f94f96bfa51c32f32
Gitweb:     http://git.kernel.org/tip/6e855cd4f4b5258016cf707f94f96bfa51c32f32
Author:     Alexander Shishkin <alexander.shishkin@...ux.intel.com>
AuthorDate: Wed, 27 Apr 2016 18:44:48 +0300
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Thu, 5 May 2016 10:13:58 +0200

perf/core: Let userspace know if the PMU supports address filters

Export an additional common attribute for PMUs that support address range
filtering to let the perf userspace identify such PMUs in a uniform way.

Signed-off-by: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Cc: Arnaldo Carvalho de Melo <acme@...radead.org>
Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Mathieu Poirier <mathieu.poirier@...aro.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Stephane Eranian <eranian@...gle.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Vince Weaver <vincent.weaver@...ne.edu>
Cc: vince@...ter.net
Link: http://lkml.kernel.org/r/1461771888-10409-8-git-send-email-alexander.shishkin@linux.intel.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 kernel/events/core.c | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/kernel/events/core.c b/kernel/events/core.c
index ffdc096..63be654 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -8273,6 +8273,20 @@ static void free_pmu_context(struct pmu *pmu)
 out:
 	mutex_unlock(&pmus_lock);
 }
+
+/*
+ * Let userspace know that this PMU supports address range filtering:
+ */
+static ssize_t nr_addr_filters_show(struct device *dev,
+				    struct device_attribute *attr,
+				    char *page)
+{
+	struct pmu *pmu = dev_get_drvdata(dev);
+
+	return snprintf(page, PAGE_SIZE - 1, "%d\n", pmu->nr_addr_filters);
+}
+DEVICE_ATTR_RO(nr_addr_filters);
+
 static struct idr pmu_idr;
 
 static ssize_t
@@ -8374,9 +8388,19 @@ static int pmu_dev_alloc(struct pmu *pmu)
 	if (ret)
 		goto free_dev;
 
+	/* For PMUs with address filters, throw in an extra attribute: */
+	if (pmu->nr_addr_filters)
+		ret = device_create_file(pmu->dev, &dev_attr_nr_addr_filters);
+
+	if (ret)
+		goto del_dev;
+
 out:
 	return ret;
 
+del_dev:
+	device_del(pmu->dev);
+
 free_dev:
 	put_device(pmu->dev);
 	goto out;
@@ -8512,6 +8536,8 @@ void perf_pmu_unregister(struct pmu *pmu)
 	free_percpu(pmu->pmu_disable_count);
 	if (pmu->type >= PERF_TYPE_MAX)
 		idr_remove(&pmu_idr, pmu->type);
+	if (pmu->nr_addr_filters)
+		device_remove_file(pmu->dev, &dev_attr_nr_addr_filters);
 	device_del(pmu->dev);
 	put_device(pmu->dev);
 	free_pmu_context(pmu);