Merge tag 'linux-kselftest-next-5.13-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest

Pull Kselftest updates from Shuah Khan:

 - fixes and updates to resctrl test from Fenghua Yu and Reinette Chatre

 - fixes to Kselftest documentation, framework

 - minor spelling correction in timers test

* tag 'linux-kselftest-next-5.13-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest: (25 commits)
  selftests/resctrl: Change a few printed messages
  Documentation: kselftest: fix path to test module files
  selftests/resctrl: Create .gitignore to include resctrl_tests
  selftests/resctrl: Fix checking for < 0 for unsigned values
  selftests/resctrl: Fix incorrect parsing of iMC counters
  selftests/resctrl: Fix unmount resctrl FS
  selftests/resctrl: Skip the test if requested resctrl feature is not supported
  selftests/resctrl: Modularize resctrl test suite main() function
  selftests/resctrl: Don't hard code value of "no_of_bits" variable
  selftests/resctrl: Fix MBA/MBM results reporting format
  selftests/resctrl: Use resctrl/info for feature detection
  selftests/resctrl: Check for resctrl mount point only if resctrl FS is supported
  selftests/resctrl: Add config dependencies
  selftests/resctrl: Fix a printed message
  selftests/resctrl: Share show_cache_info() by CAT and CMT tests
  selftests/resctrl: Call kselftest APIs to log test results
  selftests/resctrl: Rename CQM test as CMT test
  selftests/resctrl: Fix missing options "-n" and "-p"
  selftests/resctrl: Ensure sibling CPU is not same as original CPU
  selftests/resctrl: Clean up resctrl features check
  ...

1 files changed, 47 insertions, 5 deletions

diff --git a/tools/testing/selftests/resctrl/cache.c b/tools/testing/selftests/resctrl/cache.c
index 38dbf4962e33..68ff856d36f0 100644
--- a/tools/testing/selftests/resctrl/cache.c
+++ b/tools/testing/selftests/resctrl/cache.c
@@ -111,7 +111,7 @@ static int get_llc_perf(unsigned long *llc_perf_miss)
 
 /*
  * Get LLC Occupancy as reported by RESCTRL FS
- * For CQM,
+ * For CMT,
  * 1. If con_mon grp and mon grp given, then read from mon grp in
  * con_mon grp
  * 2. If only con_mon grp given, then read from con_mon grp
@@ -182,7 +182,7 @@ int measure_cache_vals(struct resctrl_val_param *param, int bm_pid)
 	/*
 	 * Measure cache miss from perf.
 	 */
-	if (!strcmp(param->resctrl_val, "cat")) {
+	if (!strncmp(param->resctrl_val, CAT_STR, sizeof(CAT_STR))) {
 		ret = get_llc_perf(&llc_perf_miss);
 		if (ret < 0)
 			return ret;
@@ -192,7 +192,7 @@ int measure_cache_vals(struct resctrl_val_param *param, int bm_pid)
 	/*
 	 * Measure llc occupancy from resctrl.
 	 */
-	if (!strcmp(param->resctrl_val, "cqm")) {
+	if (!strncmp(param->resctrl_val, CMT_STR, sizeof(CMT_STR))) {
 		ret = get_llc_occu_resctrl(&llc_occu_resc);
 		if (ret < 0)
 			return ret;
@@ -234,7 +234,7 @@ int cat_val(struct resctrl_val_param *param)
 	if (ret)
 		return ret;
 
-	if ((strcmp(resctrl_val, "cat") == 0)) {
+	if (!strncmp(resctrl_val, CAT_STR, sizeof(CAT_STR))) {
 		ret = initialize_llc_perf();
 		if (ret)
 			return ret;
@@ -242,7 +242,7 @@ int cat_val(struct resctrl_val_param *param)
 
 	/* Test runs until the callback setup() tells the test to stop. */
 	while (1) {
-		if (strcmp(resctrl_val, "cat") == 0) {
+		if (!strncmp(resctrl_val, CAT_STR, sizeof(CAT_STR))) {
 			ret = param->setup(1, param);
 			if (ret) {
 				ret = 0;
@@ -270,3 +270,45 @@ int cat_val(struct resctrl_val_param *param)
 
 	return ret;
 }
+
+/*
+ * show_cache_info:	show cache test result information
+ * @sum_llc_val:	sum of LLC cache result data
+ * @no_of_bits:		number of bits
+ * @cache_span:		cache span in bytes for CMT or in lines for CAT
+ * @max_diff:		max difference
+ * @max_diff_percent:	max difference percentage
+ * @num_of_runs:	number of runs
+ * @platform:		show test information on this platform
+ * @cmt:		CMT test or CAT test
+ *
+ * Return:		0 on success. non-zero on failure.
+ */
+int show_cache_info(unsigned long sum_llc_val, int no_of_bits,
+		    unsigned long cache_span, unsigned long max_diff,
+		    unsigned long max_diff_percent, unsigned long num_of_runs,
+		    bool platform, bool cmt)
+{
+	unsigned long avg_llc_val = 0;
+	float diff_percent;
+	long avg_diff = 0;
+	int ret;
+
+	avg_llc_val = sum_llc_val / (num_of_runs - 1);
+	avg_diff = (long)abs(cache_span - avg_llc_val);
+	diff_percent = ((float)cache_span - avg_llc_val) / cache_span * 100;
+
+	ret = platform && abs((int)diff_percent) > max_diff_percent &&
+	      (cmt ? (abs(avg_diff) > max_diff) : true);
+
+	ksft_print_msg("%s Check cache miss rate within %d%%\n",
+		       ret ? "Fail:" : "Pass:", max_diff_percent);
+
+	ksft_print_msg("Percent diff=%d\n", abs((int)diff_percent));
+	ksft_print_msg("Number of bits: %d\n", no_of_bits);
+	ksft_print_msg("Average LLC val: %lu\n", avg_llc_val);
+	ksft_print_msg("Cache span (%s): %lu\n", cmt ? "bytes" : "lines",
+		       cache_span);
+
+	return ret;
+}