@@ -138,6 +138,8 @@ int umount_resctrlfs(void);
int validate_bw_report_request(char *bw_report);
bool resctrl_resource_exists(const char *resource);
bool resctrl_mon_feature_exists(const char *feature);
+bool resource_info_file_exists(const char *resource,
+ const char *feature);
bool test_resource_feature_check(const struct resctrl_test *test);
char *fgrep(FILE *inf, const char *str);
int taskset_benchmark(pid_t bm_pid, int cpu_no, cpu_set_t *old_affinity);
@@ -763,6 +763,32 @@ bool resctrl_mon_feature_exists(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.)
+ * @feature: Required feature.
+ *
+ * Return: True if the file exists, else false.
+ */
+bool resource_info_file_exists(const char *resource,
+ const char *feature)
+{
+ char res_path[PATH_MAX];
+ struct stat statbuf;
+
+ if (!feature || !resource)
+ return false;
+
+ snprintf(res_path, sizeof(res_path), "%s/%s/%s", INFO_PATH, resource,
+ feature);
+
+ 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);
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> --- Changelog v3: - Split off the new function into this patch. (Reinette) Changelog v2: - Add this patch. tools/testing/selftests/resctrl/resctrl.h | 2 ++ tools/testing/selftests/resctrl/resctrlfs.c | 26 +++++++++++++++++++++ 2 files changed, 28 insertions(+)