Feature checking done by resctrl_mon_feature_exists() covers features represented by the feature name presence inside the 'mon_features' file in /sys/fs/resctrl/info/L3_MON directory. There exists a different way to represent feature support and that is by the presence of 0 or 1 in a single file in the info/resource directory. In this case the filename represents what feature support is being indicated.
Add a generic function to check file presence in the /sys/fs/resctrl/info/<RESOURCE> directory.
Signed-off-by: Maciej Wieczor-Retman maciej.wieczor-retman@intel.com Reviewed-by: Ilpo Järvinen ilpo.jarvinen@linux.intel.com --- Changelog v5: - feature -> file. (Reinette) - Redo return description and path in the comment. (Reinette)
Changelog v4: - Remove unnecessary new lines. - Change 'feature' -> 'file' to keep things generic. (Reinette) - Add Ilpo's reviewed-by tag.
Changelog v3: - Split off the new function into this patch. (Reinette)
Changelog v2: - Add this patch.
tools/testing/selftests/resctrl/resctrlfs.c | 25 +++++++++++++++++++++ 1 file changed, 25 insertions(+)
diff --git a/tools/testing/selftests/resctrl/resctrlfs.c b/tools/testing/selftests/resctrl/resctrlfs.c index af4f800ab23d..0e930fc06ab5 100644 --- a/tools/testing/selftests/resctrl/resctrlfs.c +++ b/tools/testing/selftests/resctrl/resctrlfs.c @@ -764,6 +764,31 @@ bool resctrl_mon_feature_exists(const char *resource, const char *feature) return !!res; }
+/* + * resource_info_file_exists - Check if a file is present inside + * /sys/fs/resctrl/info/@resource. + * @resource: Required resource (Eg: MB, L3, L2, etc.) + * @file: Required file. + * + * Return: True if the /sys/fs/resctrl/info/@resource/@file exists, else false. + */ +bool resource_info_file_exists(const char *resource, const char *file) +{ + char res_path[PATH_MAX]; + struct stat statbuf; + + if (!file || !resource) + return false; + + snprintf(res_path, sizeof(res_path), "%s/%s/%s", INFO_PATH, resource, + file); + + if (stat(res_path, &statbuf)) + return false; + + return true; +} + bool test_resource_feature_check(const struct resctrl_test *test) { return resctrl_resource_exists(test->resource);