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Commit 6e855cd4 authored by Alexander Shishkin's avatar Alexander Shishkin Committed by Ingo Molnar
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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: default avatarAlexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Cc: Arnaldo Carvalho de Melo <acme@infradead.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Cc: vince@deater.net
Link: http://lkml.kernel.org/r/1461771888-10409-8-git-send-email-alexander.shishkin@linux.intel.com


Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
parent eadf48ca

kernel/events/core.c

+26 −0
Original line number Diff line number Diff line
@@ -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);