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>

diff --git a/kernel/events/core.c b/kernel/events/core.c
index ffdc096..63be654 100644 (file)
--- 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);