selftests/resctrl: Move run_benchmark() to a more fitting file

resctrlfs.c contains mostly functions that interact in some way with
resctrl FS entries while functions inside resctrl_val.c deal with
measurements and benchmarking.

run_benchmark() is located in resctrlfs.c even though it's purpose
is not interacting with the resctrl FS but to execute cache checking
logic.

Move run_benchmark() to resctrl_val.c just before resctrl_val() that
makes use of run_benchmark(). Make run_benchmark() static since it's
not used between multiple files anymore.

Remove return comment from kernel-doc since the function is type void.
Signed-off-by: Maciej Wieczor-Retman <maciej.wieczor-retman@intel.com>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>

tools/testing/selftests/resctrl/resctrl.h

@@ -86,7 +86,6 @@ int validate_bw_report_request(char *bw_report);
 bool validate_resctrl_feature_request(const char *resource, const char *feature);
 char *fgrep(FILE *inf, const char *str);
 int taskset_benchmark(pid_t bm_pid, int cpu_no);
-void run_benchmark(int signum, siginfo_t *info, void *ucontext);
 int write_schemata(char *ctrlgrp, char *schemata, int cpu_no,
 		   char *resctrl_val);
 int write_bm_pid_to_resctrl(pid_t bm_pid, char *ctrlgrp, char *mongrp,

tools/testing/selftests/resctrl/resctrl_val.c

@@ -625,6 +625,56 @@ measure_vals(struct resctrl_val_param *param, unsigned long *bw_resc_start)
 	return 0;
 }
 
+/*
+ * run_benchmark - Run a specified benchmark or fill_buf (default benchmark)
+ *		   in specified signal. Direct benchmark stdio to /dev/null.
+ * @signum:	signal number
+ * @info:	signal info
+ * @ucontext:	user context in signal handling
+ */
+static void run_benchmark(int signum, siginfo_t *info, void *ucontext)
+{
+	int operation, ret, memflush;
+	char **benchmark_cmd;
+	size_t span;
+	bool once;
+	FILE *fp;
+
+	benchmark_cmd = info->si_ptr;
+
+	/*
+	 * Direct stdio of child to /dev/null, so that only parent writes to
+	 * stdio (console)
+	 */
+	fp = freopen("/dev/null", "w", stdout);
+	if (!fp)
+		PARENT_EXIT("Unable to direct benchmark status to /dev/null");
+
+	if (strcmp(benchmark_cmd[0], "fill_buf") == 0) {
+		/* Execute default fill_buf benchmark */
+		span = strtoul(benchmark_cmd[1], NULL, 10);
+		memflush =  atoi(benchmark_cmd[2]);
+		operation = atoi(benchmark_cmd[3]);
+		if (!strcmp(benchmark_cmd[4], "true"))
+			once = true;
+		else if (!strcmp(benchmark_cmd[4], "false"))
+			once = false;
+		else
+			PARENT_EXIT("Invalid once parameter");
+
+		if (run_fill_buf(span, memflush, operation, once))
+			fprintf(stderr, "Error in running fill buffer\n");
+	} else {
+		/* Execute specified benchmark */
+		ret = execvp(benchmark_cmd[0], benchmark_cmd);
+		if (ret)
+			perror("wrong\n");
+	}
+
+	fclose(stdout);
+	PARENT_EXIT("Unable to run specified benchmark");
+}
+
 /*
  * resctrl_val:	execute benchmark and measure memory bandwidth on
  *			the benchmark

tools/testing/selftests/resctrl/resctrlfs.c

@@ -294,58 +294,6 @@ int taskset_benchmark(pid_t bm_pid, int cpu_no)
 	return 0;
 }
 
-/*
- * run_benchmark - Run a specified benchmark or fill_buf (default benchmark)
- *		   in specified signal. Direct benchmark stdio to /dev/null.
- * @signum:	signal number
- * @info:	signal info
- * @ucontext:	user context in signal handling
- *
- * Return: void
- */
-void run_benchmark(int signum, siginfo_t *info, void *ucontext)
-{
-	int operation, ret, memflush;
-	char **benchmark_cmd;
-	size_t span;
-	bool once;
-	FILE *fp;
-
-	benchmark_cmd = info->si_ptr;
-
-	/*
-	 * Direct stdio of child to /dev/null, so that only parent writes to
-	 * stdio (console)
-	 */
-	fp = freopen("/dev/null", "w", stdout);
-	if (!fp)
-		PARENT_EXIT("Unable to direct benchmark status to /dev/null");
-
-	if (strcmp(benchmark_cmd[0], "fill_buf") == 0) {
-		/* Execute default fill_buf benchmark */
-		span = strtoul(benchmark_cmd[1], NULL, 10);
-		memflush =  atoi(benchmark_cmd[2]);
-		operation = atoi(benchmark_cmd[3]);
-		if (!strcmp(benchmark_cmd[4], "true"))
-			once = true;
-		else if (!strcmp(benchmark_cmd[4], "false"))
-			once = false;
-		else
-			PARENT_EXIT("Invalid once parameter");
-
-		if (run_fill_buf(span, memflush, operation, once))
-			fprintf(stderr, "Error in running fill buffer\n");
-	} else {
-		/* Execute specified benchmark */
-		ret = execvp(benchmark_cmd[0], benchmark_cmd);
-		if (ret)
-			perror("wrong\n");
-	}
-
-	fclose(stdout);
-	PARENT_EXIT("Unable to run specified benchmark");
-}
-
 /*
  * create_grp - Create a group only if one doesn't exist
  * @grp_name:	Name of the group