Commit-ID: 6e855cd4f4b5258016cf707f94f96bfa51c32f32 Gitweb: http://git.kernel.org/tip/6e855cd4f4b5258016cf707f94f96bfa51c32f32 Author: Alexander Shishkin <alexander.shish...@linux.intel.com> AuthorDate: Wed, 27 Apr 2016 18:44:48 +0300 Committer: Ingo Molnar <mi...@kernel.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.shish...@linux.intel.com> Signed-off-by: Peter Zijlstra (Intel) <pet...@infradead.org> Cc: Arnaldo Carvalho de Melo <a...@infradead.org> Cc: Arnaldo Carvalho de Melo <a...@redhat.com> Cc: Borislav Petkov <b...@alien8.de> Cc: Jiri Olsa <jo...@redhat.com> Cc: Linus Torvalds <torva...@linux-foundation.org> Cc: Mathieu Poirier <mathieu.poir...@linaro.org> Cc: Peter Zijlstra <pet...@infradead.org> Cc: Stephane Eranian <eran...@google.com> Cc: Thomas Gleixner <t...@linutronix.de> Cc: Vince Weaver <vincent.wea...@maine.edu> Cc: vi...@deater.net Link: http://lkml.kernel.org/r/1461771888-10409-8-git-send-email-alexander.shish...@linux.intel.com Signed-off-by: Ingo Molnar <mi...@kernel.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);
