diff options
author | Alexander Shishkin <alexander.shishkin@linux.intel.com> | 2016-04-26 19:22:24 +0300 |
---|---|---|
committer | Alexander Shishkin <alexander.shishkin@linux.intel.com> | 2016-04-26 19:36:16 +0300 |
commit | 1b0f1a92512bacbc5111795c290bc7d18cecbf65 (patch) | |
tree | f1959ef45d3226c4b1b04133d48ac6e5d5be05da | |
parent | b46c657ad86c9c1f9e9c1fa5b785066f2ef66e48 (diff) | |
download | linux-perf-addr-filters.tar.gz |
perf: Let userspace know if pmu supports address filtersperf-addr-filters
Export an additional attribute for PMUs that support address range
filtering.
Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
-rw-r--r-- | kernel/events/core.c | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/kernel/events/core.c b/kernel/events/core.c index 4b8d0979d9b6c8..5a772624f8f28c 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -8261,6 +8261,20 @@ 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 @@ -8362,9 +8376,19 @@ 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; @@ -8500,6 +8524,8 @@ 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); |