[PATCH 21/22] selftests/resctrl: Split show_cache_info() to test specific and generic parts

[Ilpo Järvinen]

show_cache_info() attempts to do calculate the results and provide
generic cache information. It makes hard to alter the pass/fail
conditions.

Separate the the test specific checks into CAT and CMT test files and
leave only the generic information part into show_cache_info().

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@xxxxxxxxxxxxxxx>
---
 tools/testing/selftests/resctrl/cache.c    | 40 ++++------------------
 tools/testing/selftests/resctrl/cat_test.c | 30 ++++++++++++++--
 tools/testing/selftests/resctrl/cmt_test.c | 32 +++++++++++++++--
 tools/testing/selftests/resctrl/resctrl.h  |  6 ++--
 4 files changed, 65 insertions(+), 43 deletions(-)

diff --git a/tools/testing/selftests/resctrl/cache.c b/tools/testing/selftests/resctrl/cache.c
index 225ba589d230..becca3ce4f9e 100644
--- a/tools/testing/selftests/resctrl/cache.c
+++ b/tools/testing/selftests/resctrl/cache.c
@@ -283,43 +283,17 @@ int cat_val(struct resctrl_val_param *param)
 }
 
 /*
- * show_cache_info:	show cache test result information
- * @sum_llc_val:	sum of LLC cache result data
+ * show_cache_info:	show generic cache test information
  * @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.
+ * @avg_llc_val:	avg of LLC cache result data
+ * @cache_span:		cache span
+ * @lines:		cache span in lines or bytes
  */
-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)
+void show_cache_info(int no_of_bits, unsigned long avg_llc_val,
+		     unsigned long cache_span, bool lines)
 {
-	unsigned long avg_llc_val = 0;
-	float diff_percent;
-	long avg_diff = 0;
-	int ret;
-
-	avg_llc_val = sum_llc_val / num_of_runs;
-	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",
+	ksft_print_msg("Cache span (%s): %lu\n", !lines ? "bytes" : "lines",
 		       cache_span);
-
-	return ret;
 }
diff --git a/tools/testing/selftests/resctrl/cat_test.c b/tools/testing/selftests/resctrl/cat_test.c
index cfad7e488340..d2b7369ad00e 100644
--- a/tools/testing/selftests/resctrl/cat_test.c
+++ b/tools/testing/selftests/resctrl/cat_test.c
@@ -41,6 +41,30 @@ static int cat_setup(struct resctrl_val_param *p)
 	return ret;
 }
 
+static int show_results_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)
+{
+	unsigned long avg_llc_val = 0;
+	float diff_percent;
+	int ret;
+
+	avg_llc_val = sum_llc_val / num_of_runs;
+	diff_percent = ((float)cache_span - avg_llc_val) / cache_span * 100;
+
+	ret = platform && abs((int)diff_percent) > max_diff_percent;
+
+	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));
+
+	show_cache_info(no_of_bits, avg_llc_val, cache_span, true);
+
+	return ret;
+}
+
 static int check_results(struct resctrl_val_param *param)
 {
 	char *token_array[8], temp[512];
@@ -76,9 +100,9 @@ static int check_results(struct resctrl_val_param *param)
 	fclose(fp);
 	no_of_bits = count_consecutive_bits(param->mask, NULL);
 
-	return show_cache_info(sum_llc_perf_miss, no_of_bits, param->span / 64,
-			       MAX_DIFF, MAX_DIFF_PERCENT, runs - 1,
-			       get_vendor() == ARCH_INTEL, false);
+	return show_results_info(sum_llc_perf_miss, no_of_bits, param->span / 64,
+				 MAX_DIFF, MAX_DIFF_PERCENT, runs - 1,
+				 get_vendor() == ARCH_INTEL);
 }
 
 void cat_test_cleanup(void)
diff --git a/tools/testing/selftests/resctrl/cmt_test.c b/tools/testing/selftests/resctrl/cmt_test.c
index 8fda7fc4d159..6f06f70d81cf 100644
--- a/tools/testing/selftests/resctrl/cmt_test.c
+++ b/tools/testing/selftests/resctrl/cmt_test.c
@@ -27,6 +27,33 @@ static int cmt_setup(struct resctrl_val_param *p)
 	return 0;
 }
 
+static int show_results_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)
+{
+	unsigned long avg_llc_val = 0;
+	float diff_percent;
+	long avg_diff = 0;
+	int ret;
+
+	avg_llc_val = sum_llc_val / num_of_runs;
+	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 &&
+	      abs(avg_diff) > max_diff;
+
+	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));
+
+	show_cache_info(no_of_bits, avg_llc_val, cache_span, false);
+
+	return ret;
+}
+
 static int check_results(struct resctrl_val_param *param, int no_of_bits)
 {
 	char *token_array[8], temp[512];
@@ -58,9 +85,8 @@ static int check_results(struct resctrl_val_param *param, int no_of_bits)
 	}
 	fclose(fp);
 
-	return show_cache_info(sum_llc_occu_resc, no_of_bits, param->span,
-			       MAX_DIFF, MAX_DIFF_PERCENT, runs - 1,
-			       true, true);
+	return show_results_info(sum_llc_occu_resc, no_of_bits, param->span,
+				 MAX_DIFF, MAX_DIFF_PERCENT, runs - 1, true);
 }
 
 void cmt_test_cleanup(void)
diff --git a/tools/testing/selftests/resctrl/resctrl.h b/tools/testing/selftests/resctrl/resctrl.h
index 028b979c28fb..26061db0b9ea 100644
--- a/tools/testing/selftests/resctrl/resctrl.h
+++ b/tools/testing/selftests/resctrl/resctrl.h
@@ -125,9 +125,7 @@ unsigned int count_bits(unsigned long n);
 void cmt_test_cleanup(void);
 int get_core_sibling(int cpu_no);
 int measure_llc_resctrl(struct resctrl_val_param *param, int bm_pid);
-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);
+void show_cache_info(int no_of_bits, unsigned long avg_llc_val,
+		     unsigned long cache_span, bool lines);
 
 #endif /* RESCTRL_H */
-- 
2.30.2