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authorAlexander Shishkin <alexander.shishkin@linux.intel.com>2016-04-27 11:44:48 -0400
committerIngo Molnar <mingo@kernel.org>2016-05-05 04:13:58 -0400
commit6e855cd4f4b5258016cf707f94f96bfa51c32f32 (patch)
tree93d48a83ce47cf89801a9257dfbf19847ba2af5d
parenteadf48cab4b6b0ab8bcd53feb7d52a71e72debd0 (diff)
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@linux.intel.com> Signed-off-by: Peter 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: Ingo Molnar <mingo@kernel.org>
-rw-r--r--kernel/events/core.c26
1 files changed, 26 insertions, 0 deletions
diff --git a/kernel/events/core.c b/kernel/events/core.c
index ffdc096a4f4e..63be65437e9e 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -8273,6 +8273,20 @@ static void free_pmu_context(struct pmu *pmu)
8273out: 8273out:
8274 mutex_unlock(&pmus_lock); 8274 mutex_unlock(&pmus_lock);
8275} 8275}
8276
8277/*
8278 * Let userspace know that this PMU supports address range filtering:
8279 */
8280static ssize_t nr_addr_filters_show(struct device *dev,
8281 struct device_attribute *attr,
8282 char *page)
8283{
8284 struct pmu *pmu = dev_get_drvdata(dev);
8285
8286 return snprintf(page, PAGE_SIZE - 1, "%d\n", pmu->nr_addr_filters);
8287}
8288DEVICE_ATTR_RO(nr_addr_filters);
8289
8276static struct idr pmu_idr; 8290static struct idr pmu_idr;
8277 8291
8278static ssize_t 8292static ssize_t
@@ -8374,9 +8388,19 @@ static int pmu_dev_alloc(struct pmu *pmu)
8374 if (ret) 8388 if (ret)
8375 goto free_dev; 8389 goto free_dev;
8376 8390
8391 /* For PMUs with address filters, throw in an extra attribute: */
8392 if (pmu->nr_addr_filters)
8393 ret = device_create_file(pmu->dev, &dev_attr_nr_addr_filters);
8394
8395 if (ret)
8396 goto del_dev;
8397
8377out: 8398out:
8378 return ret; 8399 return ret;
8379 8400
8401del_dev:
8402 device_del(pmu->dev);
8403
8380free_dev: 8404free_dev:
8381 put_device(pmu->dev); 8405 put_device(pmu->dev);
8382 goto out; 8406 goto out;
@@ -8512,6 +8536,8 @@ void perf_pmu_unregister(struct pmu *pmu)
8512 free_percpu(pmu->pmu_disable_count); 8536 free_percpu(pmu->pmu_disable_count);
8513 if (pmu->type >= PERF_TYPE_MAX) 8537 if (pmu->type >= PERF_TYPE_MAX)
8514 idr_remove(&pmu_idr, pmu->type); 8538 idr_remove(&pmu_idr, pmu->type);
8539 if (pmu->nr_addr_filters)
8540 device_remove_file(pmu->dev, &dev_attr_nr_addr_filters);
8515 device_del(pmu->dev); 8541 device_del(pmu->dev);
8516 put_device(pmu->dev); 8542 put_device(pmu->dev);
8517 free_pmu_context(pmu); 8543 free_pmu_context(pmu);