From cc8ff7f5c85c076297b18fb9f6d45ec5569d3d44 Mon Sep 17 00:00:00 2001
From: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Date: Fri, 15 Dec 2023 17:04:47 +0200
Subject: selftests/resctrl: Convert perror() to ksft_perror() or
 ksft_print_msg()
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

The resctrl selftest code contains a number of perror() calls. Some of
them come with hash character and some don't. The kselftest framework
provides ksft_perror() that is compatible with test output formatting
so it should be used instead of adding custom hash signs.

Some perror() calls are too far away from anything that sets error.
For those call sites, ksft_print_msg() must be used instead.

Convert perror() to ksft_perror() or ksft_print_msg().

Other related changes:
- Remove hash signs
- Remove trailing stops & newlines from ksft_perror()
- Add terminating newlines for converted ksft_print_msg()
- Use consistent capitalization
- Small fixes/tweaks to typos & grammar of the messages
- Extract error printing out of PARENT_EXIT() to be able to
  differentiate

Signed-off-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/cmt_test.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'tools/testing/selftests/resctrl/cmt_test.c')

diff --git a/tools/testing/selftests/resctrl/cmt_test.c b/tools/testing/selftests/resctrl/cmt_test.c
index 50bdbce9fba9..16fc0488e0a5 100644
--- a/tools/testing/selftests/resctrl/cmt_test.c
+++ b/tools/testing/selftests/resctrl/cmt_test.c
@@ -37,7 +37,7 @@ static int check_results(struct resctrl_val_param *param, size_t span, int no_of
 	ksft_print_msg("Checking for pass/fail\n");
 	fp = fopen(param->filename, "r");
 	if (!fp) {
-		perror("# Error in opening file\n");
+		ksft_perror("Error in opening file");
 
 		return errno;
 	}
-- 
cgit v1.2.3


From c90fba60f274b182f8b4df0f5a5dd23a2457f4a3 Mon Sep 17 00:00:00 2001
From: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Date: Fri, 15 Dec 2023 17:04:48 +0200
Subject: selftests/resctrl: Return -1 instead of errno on error
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

A number of functions in the resctrl selftests return errno. It is
problematic because errno is positive which is often counterintuitive.
Also, every site returning errno prints the error message already with
ksft_perror() so there is not much added value in returning the precise
error code.

Simply convert all places returning errno to return -1 that is typical
userspace error code in case of failures.

While at it, improve resctrl_val() comment to state that 0 means the
test was run (either pass or fail).

Signed-off-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/cache.c       |  6 +++---
 tools/testing/selftests/resctrl/cat_test.c    |  4 ++--
 tools/testing/selftests/resctrl/cmt_test.c    |  2 +-
 tools/testing/selftests/resctrl/mba_test.c    |  2 +-
 tools/testing/selftests/resctrl/mbm_test.c    |  2 +-
 tools/testing/selftests/resctrl/resctrl_val.c | 10 +++++-----
 tools/testing/selftests/resctrl/resctrlfs.c   |  2 +-
 7 files changed, 14 insertions(+), 14 deletions(-)

(limited to 'tools/testing/selftests/resctrl/cmt_test.c')

diff --git a/tools/testing/selftests/resctrl/cache.c b/tools/testing/selftests/resctrl/cache.c
index 992bac8c352b..1fa4b86e1459 100644
--- a/tools/testing/selftests/resctrl/cache.c
+++ b/tools/testing/selftests/resctrl/cache.c
@@ -126,7 +126,7 @@ static int get_llc_occu_resctrl(unsigned long *llc_occupancy)
 	if (!fp) {
 		ksft_perror("Failed to open results file");
 
-		return errno;
+		return -1;
 	}
 	if (fscanf(fp, "%lu", llc_occupancy) <= 0) {
 		ksft_perror("Could not get llc occupancy");
@@ -146,7 +146,7 @@ static int get_llc_occu_resctrl(unsigned long *llc_occupancy)
  * @llc_value:		perf miss value /
  *			llc occupancy value reported by resctrl FS
  *
- * Return:		0 on success. non-zero on failure.
+ * Return:		0 on success, < 0 on error.
  */
 static int print_results_cache(char *filename, int bm_pid,
 			       unsigned long llc_value)
@@ -161,7 +161,7 @@ static int print_results_cache(char *filename, int bm_pid,
 		if (!fp) {
 			ksft_perror("Cannot open results file");
 
-			return errno;
+			return -1;
 		}
 		fprintf(fp, "Pid: %d \t llc_value: %lu\n", bm_pid, llc_value);
 		fclose(fp);
diff --git a/tools/testing/selftests/resctrl/cat_test.c b/tools/testing/selftests/resctrl/cat_test.c
index 9bb8ba93f433..fabb56ff68d1 100644
--- a/tools/testing/selftests/resctrl/cat_test.c
+++ b/tools/testing/selftests/resctrl/cat_test.c
@@ -53,7 +53,7 @@ static int check_results(struct resctrl_val_param *param, size_t span)
 	if (!fp) {
 		ksft_perror("Cannot open file");
 
-		return errno;
+		return -1;
 	}
 
 	while (fgets(temp, sizeof(temp), fp)) {
@@ -150,7 +150,7 @@ int cat_perf_miss_val(int cpu_no, int n, char *cache_type)
 
 	if (pipe(pipefd)) {
 		ksft_perror("Unable to create pipe");
-		return errno;
+		return -1;
 	}
 
 	fflush(stdout);
diff --git a/tools/testing/selftests/resctrl/cmt_test.c b/tools/testing/selftests/resctrl/cmt_test.c
index 16fc0488e0a5..ffd302bd5c73 100644
--- a/tools/testing/selftests/resctrl/cmt_test.c
+++ b/tools/testing/selftests/resctrl/cmt_test.c
@@ -39,7 +39,7 @@ static int check_results(struct resctrl_val_param *param, size_t span, int no_of
 	if (!fp) {
 		ksft_perror("Error in opening file");
 
-		return errno;
+		return -1;
 	}
 
 	while (fgets(temp, sizeof(temp), fp)) {
diff --git a/tools/testing/selftests/resctrl/mba_test.c b/tools/testing/selftests/resctrl/mba_test.c
index 4988b93add6a..e907adf7cd25 100644
--- a/tools/testing/selftests/resctrl/mba_test.c
+++ b/tools/testing/selftests/resctrl/mba_test.c
@@ -111,7 +111,7 @@ static int check_results(void)
 	if (!fp) {
 		ksft_perror(output);
 
-		return errno;
+		return -1;
 	}
 
 	runs = 0;
diff --git a/tools/testing/selftests/resctrl/mbm_test.c b/tools/testing/selftests/resctrl/mbm_test.c
index 045cd7818c79..721b3ecbc158 100644
--- a/tools/testing/selftests/resctrl/mbm_test.c
+++ b/tools/testing/selftests/resctrl/mbm_test.c
@@ -61,7 +61,7 @@ static int check_results(size_t span)
 	if (!fp) {
 		ksft_perror(output);
 
-		return errno;
+		return -1;
 	}
 
 	runs = 0;
diff --git a/tools/testing/selftests/resctrl/resctrl_val.c b/tools/testing/selftests/resctrl/resctrl_val.c
index 231d2012de2b..7fd9f1010135 100644
--- a/tools/testing/selftests/resctrl/resctrl_val.c
+++ b/tools/testing/selftests/resctrl/resctrl_val.c
@@ -526,7 +526,7 @@ void signal_handler_unregister(void)
  * @bw_imc:		perf imc counter value
  * @bw_resc:		memory bandwidth value
  *
- * Return:		0 on success. non-zero on failure.
+ * Return:		0 on success, < 0 on error.
  */
 static int print_results_bw(char *filename,  int bm_pid, float bw_imc,
 			    unsigned long bw_resc)
@@ -542,14 +542,14 @@ static int print_results_bw(char *filename,  int bm_pid, float bw_imc,
 		if (!fp) {
 			ksft_perror("Cannot open results file");
 
-			return errno;
+			return -1;
 		}
 		if (fprintf(fp, "Pid: %d \t Mem_BW_iMC: %f \t Mem_BW_resc: %lu \t Difference: %lu\n",
 			    bm_pid, bw_imc, bw_resc, diff) <= 0) {
 			ksft_print_msg("Could not log results\n");
 			fclose(fp);
 
-			return errno;
+			return -1;
 		}
 		fclose(fp);
 	}
@@ -686,7 +686,7 @@ static void run_benchmark(int signum, siginfo_t *info, void *ucontext)
  * @benchmark_cmd:	benchmark command and its arguments
  * @param:		parameters passed to resctrl_val()
  *
- * Return:		0 on success. non-zero on failure.
+ * Return:		0 when the test was run, < 0 on error.
  */
 int resctrl_val(const char * const *benchmark_cmd, struct resctrl_val_param *param)
 {
@@ -814,7 +814,7 @@ int resctrl_val(const char * const *benchmark_cmd, struct resctrl_val_param *par
 	/* Signal child to start benchmark */
 	if (sigqueue(bm_pid, SIGUSR1, value) == -1) {
 		ksft_perror("sigqueue SIGUSR1 to child");
-		ret = errno;
+		ret = -1;
 		goto out;
 	}
 
diff --git a/tools/testing/selftests/resctrl/resctrlfs.c b/tools/testing/selftests/resctrl/resctrlfs.c
index 77023d342a12..5fb595ed8843 100644
--- a/tools/testing/selftests/resctrl/resctrlfs.c
+++ b/tools/testing/selftests/resctrl/resctrlfs.c
@@ -88,7 +88,7 @@ int umount_resctrlfs(void)
 	if (umount(mountpoint)) {
 		ksft_perror("Unable to umount resctrl");
 
-		return errno;
+		return -1;
 	}
 
 	return 0;
-- 
cgit v1.2.3


From 4b357e2a6d6c364a88d50526675fe596a30766cb Mon Sep 17 00:00:00 2001
From: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Date: Fri, 15 Dec 2023 17:04:53 +0200
Subject: selftests/resctrl: Refactor get_cbm_mask() and rename to
 get_full_cbm()
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Callers of get_cbm_mask() are required to pass a string into which the
capacity bitmask (CBM) is read. Neither CAT nor CMT tests need the
bitmask as string but just convert it into an unsigned long value.

Another limitation is that the bit mask reader can only read
.../cbm_mask files.

Generalize the bit mask reading function into get_bit_mask() such that
it can be used to handle other files besides the .../cbm_mask and
handles the unsigned long conversion within get_bit_mask() using
fscanf(). Change get_cbm_mask() to use get_bit_mask() and rename it to
get_full_cbm() to better indicate what the function does.

Return error from get_full_cbm() if the bitmask is zero for some reason
because it makes the code more robust as the selftests naturally assume
the bitmask has some bits.

Also mark cache_type const while at it and remove useless comments that
are related to processing of CBM bits.

Co-developed-by: Fenghua Yu <fenghua.yu@intel.com>
Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
Signed-off-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/cat_test.c  |  7 +---
 tools/testing/selftests/resctrl/cmt_test.c  |  5 +--
 tools/testing/selftests/resctrl/resctrl.h   |  2 +-
 tools/testing/selftests/resctrl/resctrlfs.c | 51 +++++++++++++++++++++--------
 4 files changed, 41 insertions(+), 24 deletions(-)

(limited to 'tools/testing/selftests/resctrl/cmt_test.c')

diff --git a/tools/testing/selftests/resctrl/cat_test.c b/tools/testing/selftests/resctrl/cat_test.c
index fabb56ff68d1..242c4c6200aa 100644
--- a/tools/testing/selftests/resctrl/cat_test.c
+++ b/tools/testing/selftests/resctrl/cat_test.c
@@ -93,25 +93,20 @@ int cat_perf_miss_val(int cpu_no, int n, char *cache_type)
 	int ret, pipefd[2], sibling_cpu_no;
 	unsigned long cache_size = 0;
 	unsigned long long_mask;
-	char cbm_mask[256];
 	int count_of_bits;
 	char pipe_message;
 	size_t span;
 
-	/* Get default cbm mask for L3/L2 cache */
-	ret = get_cbm_mask(cache_type, cbm_mask);
+	ret = get_full_cbm(cache_type, &long_mask);
 	if (ret)
 		return ret;
 
-	long_mask = strtoul(cbm_mask, NULL, 16);
-
 	/* Get L3/L2 cache size */
 	ret = get_cache_size(cpu_no, cache_type, &cache_size);
 	if (ret)
 		return ret;
 	ksft_print_msg("Cache size :%lu\n", cache_size);
 
-	/* Get max number of bits from default-cabm mask */
 	count_of_bits = count_bits(long_mask);
 
 	if (!n)
diff --git a/tools/testing/selftests/resctrl/cmt_test.c b/tools/testing/selftests/resctrl/cmt_test.c
index ffd302bd5c73..a18c6825802c 100644
--- a/tools/testing/selftests/resctrl/cmt_test.c
+++ b/tools/testing/selftests/resctrl/cmt_test.c
@@ -75,17 +75,14 @@ int cmt_resctrl_val(int cpu_no, int n, const char * const *benchmark_cmd)
 	unsigned long cache_size = 0;
 	unsigned long long_mask;
 	char *span_str = NULL;
-	char cbm_mask[256];
 	int count_of_bits;
 	size_t span;
 	int ret, i;
 
-	ret = get_cbm_mask("L3", cbm_mask);
+	ret = get_full_cbm("L3", &long_mask);
 	if (ret)
 		return ret;
 
-	long_mask = strtoul(cbm_mask, NULL, 16);
-
 	ret = get_cache_size(cpu_no, "L3", &cache_size);
 	if (ret)
 		return ret;
diff --git a/tools/testing/selftests/resctrl/resctrl.h b/tools/testing/selftests/resctrl/resctrl.h
index a848e9c75578..89cd89507891 100644
--- a/tools/testing/selftests/resctrl/resctrl.h
+++ b/tools/testing/selftests/resctrl/resctrl.h
@@ -98,7 +98,7 @@ void tests_cleanup(void);
 void mbm_test_cleanup(void);
 int mba_schemata_change(int cpu_no, const char * const *benchmark_cmd);
 void mba_test_cleanup(void);
-int get_cbm_mask(char *cache_type, char *cbm_mask);
+int get_full_cbm(const char *cache_type, unsigned long *mask);
 int get_cache_size(int cpu_no, char *cache_type, unsigned long *cache_size);
 void ctrlc_handler(int signum, siginfo_t *info, void *ptr);
 int signal_handler_register(void);
diff --git a/tools/testing/selftests/resctrl/resctrlfs.c b/tools/testing/selftests/resctrl/resctrlfs.c
index 81d1e043e17a..a74be17eaa4e 100644
--- a/tools/testing/selftests/resctrl/resctrlfs.c
+++ b/tools/testing/selftests/resctrl/resctrlfs.c
@@ -196,30 +196,29 @@ int get_cache_size(int cpu_no, char *cache_type, unsigned long *cache_size)
 #define CORE_SIBLINGS_PATH	"/sys/bus/cpu/devices/cpu"
 
 /*
- * get_cbm_mask - Get cbm mask for given cache
- * @cache_type:	Cache level L2/L3
- * @cbm_mask:	cbm_mask returned as a string
+ * get_bit_mask - Get bit mask from given file
+ * @filename:	File containing the mask
+ * @mask:	The bit mask returned as unsigned long
  *
  * Return: = 0 on success, < 0 on failure.
  */
-int get_cbm_mask(char *cache_type, char *cbm_mask)
+static int get_bit_mask(const char *filename, unsigned long *mask)
 {
-	char cbm_mask_path[1024];
 	FILE *fp;
 
-	if (!cbm_mask)
+	if (!filename || !mask)
 		return -1;
 
-	sprintf(cbm_mask_path, "%s/%s/cbm_mask", INFO_PATH, cache_type);
-
-	fp = fopen(cbm_mask_path, "r");
+	fp = fopen(filename, "r");
 	if (!fp) {
-		ksft_perror("Failed to open cache level");
-
+		ksft_print_msg("Failed to open bit mask file '%s': %s\n",
+			       filename, strerror(errno));
 		return -1;
 	}
-	if (fscanf(fp, "%s", cbm_mask) <= 0) {
-		ksft_perror("Could not get max cbm_mask");
+
+	if (fscanf(fp, "%lx", mask) <= 0) {
+		ksft_print_msg("Could not read bit mask file '%s': %s\n",
+			       filename, strerror(errno));
 		fclose(fp);
 
 		return -1;
@@ -229,6 +228,32 @@ int get_cbm_mask(char *cache_type, char *cbm_mask)
 	return 0;
 }
 
+/*
+ * get_full_cbm - Get full Cache Bit Mask (CBM)
+ * @cache_type:	Cache type as "L2" or "L3"
+ * @mask:	Full cache bit mask representing the maximal portion of cache
+ *		available for allocation, returned as unsigned long.
+ *
+ * Return: = 0 on success, < 0 on failure.
+ */
+int get_full_cbm(const char *cache_type, unsigned long *mask)
+{
+	char cbm_path[PATH_MAX];
+	int ret;
+
+	if (!cache_type)
+		return -1;
+
+	snprintf(cbm_path, sizeof(cbm_path), "%s/%s/cbm_mask",
+		 INFO_PATH, cache_type);
+
+	ret = get_bit_mask(cbm_path, mask);
+	if (ret || !*mask)
+		return -1;
+
+	return 0;
+}
+
 /*
  * get_core_sibling - Get sibling core id from the same socket for given CPU
  * @cpu_no:	CPU number
-- 
cgit v1.2.3


From 19e94a2333c2babc773e51a9ed844cfc35a36064 Mon Sep 17 00:00:00 2001
From: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Date: Fri, 15 Dec 2023 17:04:55 +0200
Subject: selftests/resctrl: Create cache_portion_size() helper
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

CAT and CMT tests calculate size of the cache portion for the n-bits
cache allocation on their own.

Add cache_portion_size() helper that calculates size of the cache
portion for the given number of bits and use it to replace the existing
span calculations. This also prepares for the new CAT test that will
need to determine the size of the cache portion also during results
processing.

Rename also 'cache_size' local variables to 'cache_total_size' to
prevent misinterpretations.

Signed-off-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/cat_test.c | 10 +++++-----
 tools/testing/selftests/resctrl/cmt_test.c |  8 ++++----
 tools/testing/selftests/resctrl/resctrl.h  | 24 ++++++++++++++++++++++++
 3 files changed, 33 insertions(+), 9 deletions(-)

(limited to 'tools/testing/selftests/resctrl/cmt_test.c')

diff --git a/tools/testing/selftests/resctrl/cat_test.c b/tools/testing/selftests/resctrl/cat_test.c
index 242c4c6200aa..f18c95dda5d3 100644
--- a/tools/testing/selftests/resctrl/cat_test.c
+++ b/tools/testing/selftests/resctrl/cat_test.c
@@ -91,7 +91,7 @@ int cat_perf_miss_val(int cpu_no, int n, char *cache_type)
 {
 	unsigned long l_mask, l_mask_1;
 	int ret, pipefd[2], sibling_cpu_no;
-	unsigned long cache_size = 0;
+	unsigned long cache_total_size = 0;
 	unsigned long long_mask;
 	int count_of_bits;
 	char pipe_message;
@@ -102,10 +102,10 @@ int cat_perf_miss_val(int cpu_no, int n, char *cache_type)
 		return ret;
 
 	/* Get L3/L2 cache size */
-	ret = get_cache_size(cpu_no, cache_type, &cache_size);
+	ret = get_cache_size(cpu_no, cache_type, &cache_total_size);
 	if (ret)
 		return ret;
-	ksft_print_msg("Cache size :%lu\n", cache_size);
+	ksft_print_msg("Cache size :%lu\n", cache_total_size);
 
 	count_of_bits = count_bits(long_mask);
 
@@ -136,7 +136,7 @@ int cat_perf_miss_val(int cpu_no, int n, char *cache_type)
 	/* Set param values for parent thread which will be allocated bitmask
 	 * with (max_bits - n) bits
 	 */
-	span = cache_size * (count_of_bits - n) / count_of_bits;
+	span = cache_portion_size(cache_total_size, l_mask, long_mask);
 	strcpy(param.ctrlgrp, "c2");
 	strcpy(param.mongrp, "m2");
 	strcpy(param.filename, RESULT_FILE_NAME2);
@@ -158,7 +158,7 @@ int cat_perf_miss_val(int cpu_no, int n, char *cache_type)
 		param.mask = l_mask_1;
 		strcpy(param.ctrlgrp, "c1");
 		strcpy(param.mongrp, "m1");
-		span = cache_size * n / count_of_bits;
+		span = cache_portion_size(cache_total_size, l_mask_1, long_mask);
 		strcpy(param.filename, RESULT_FILE_NAME1);
 		param.num_of_runs = 0;
 		param.cpu_no = sibling_cpu_no;
diff --git a/tools/testing/selftests/resctrl/cmt_test.c b/tools/testing/selftests/resctrl/cmt_test.c
index a18c6825802c..a14d46353865 100644
--- a/tools/testing/selftests/resctrl/cmt_test.c
+++ b/tools/testing/selftests/resctrl/cmt_test.c
@@ -72,7 +72,7 @@ int cmt_resctrl_val(int cpu_no, int n, const char * const *benchmark_cmd)
 {
 	const char * const *cmd = benchmark_cmd;
 	const char *new_cmd[BENCHMARK_ARGS];
-	unsigned long cache_size = 0;
+	unsigned long cache_total_size = 0;
 	unsigned long long_mask;
 	char *span_str = NULL;
 	int count_of_bits;
@@ -83,10 +83,10 @@ int cmt_resctrl_val(int cpu_no, int n, const char * const *benchmark_cmd)
 	if (ret)
 		return ret;
 
-	ret = get_cache_size(cpu_no, "L3", &cache_size);
+	ret = get_cache_size(cpu_no, "L3", &cache_total_size);
 	if (ret)
 		return ret;
-	ksft_print_msg("Cache size :%lu\n", cache_size);
+	ksft_print_msg("Cache size :%lu\n", cache_total_size);
 
 	count_of_bits = count_bits(long_mask);
 
@@ -107,7 +107,7 @@ int cmt_resctrl_val(int cpu_no, int n, const char * const *benchmark_cmd)
 		.setup		= cmt_setup,
 	};
 
-	span = cache_size * n / count_of_bits;
+	span = cache_portion_size(cache_total_size, param.mask, long_mask);
 
 	if (strcmp(cmd[0], "fill_buf") == 0) {
 		/* Duplicate the command to be able to replace span in it */
diff --git a/tools/testing/selftests/resctrl/resctrl.h b/tools/testing/selftests/resctrl/resctrl.h
index 9e5777e1eee3..08647f2c07f5 100644
--- a/tools/testing/selftests/resctrl/resctrl.h
+++ b/tools/testing/selftests/resctrl/resctrl.h
@@ -116,4 +116,28 @@ int show_cache_info(unsigned long sum_llc_val, int no_of_bits,
 		    unsigned long max_diff_percent, unsigned long num_of_runs,
 		    bool platform, bool cmt);
 
+/*
+ * cache_portion_size - Calculate the size of a cache portion
+ * @cache_size:		Total cache size in bytes
+ * @portion_mask:	Cache portion mask
+ * @full_cache_mask:	Full Cache Bit Mask (CBM) for the cache
+ *
+ * Return: The size of the cache portion in bytes.
+ */
+static inline unsigned long cache_portion_size(unsigned long cache_size,
+					       unsigned long portion_mask,
+					       unsigned long full_cache_mask)
+{
+	unsigned int bits = count_bits(full_cache_mask);
+
+	/*
+	 * With no bits the full CBM, assume cache cannot be split into
+	 * smaller portions. To avoid divide by zero, return cache_size.
+	 */
+	if (!bits)
+		return cache_size;
+
+	return cache_size * count_bits(portion_mask) / bits;
+}
+
 #endif /* RESCTRL_H */
-- 
cgit v1.2.3


From 5caf1b6400d30a31363063314bddea4e5680d639 Mon Sep 17 00:00:00 2001
From: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Date: Fri, 15 Dec 2023 17:04:58 +0200
Subject: selftests/resctrl: Split show_cache_info() to test specific and
 generic parts
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

show_cache_info() calculates results and provides generic cache
information. This makes it hard to alter pass/fail conditions.

Separate 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@linux.intel.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
---
 tools/testing/selftests/resctrl/cache.c    | 42 ++++++------------------------
 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, 66 insertions(+), 44 deletions(-)

(limited to 'tools/testing/selftests/resctrl/cmt_test.c')

diff --git a/tools/testing/selftests/resctrl/cache.c b/tools/testing/selftests/resctrl/cache.c
index 0c18603435c8..32e262fa2a6c 100644
--- a/tools/testing/selftests/resctrl/cache.c
+++ b/tools/testing/selftests/resctrl/cache.c
@@ -279,43 +279,17 @@ pe_close:
 }
 
 /*
- * 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.
+ * show_cache_info - Show generic cache test information
+ * @no_of_bits:		Number of bits
+ * @avg_llc_val:	Average 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,
-		    size_t 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,
+		     size_t 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 %lu%%\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): %zu\n", cmt ? "bytes" : "lines",
+	ksft_print_msg("Cache span (%s): %zu\n", lines ? "lines" : "bytes",
 		       cache_span);
-
-	return ret;
 }
diff --git a/tools/testing/selftests/resctrl/cat_test.c b/tools/testing/selftests/resctrl/cat_test.c
index 1e3c5432ecff..0955f819bd83 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 %lu%%\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, size_t span)
 {
 	char *token_array[8], temp[512];
@@ -76,9 +100,9 @@ static int check_results(struct resctrl_val_param *param, size_t span)
 	fclose(fp);
 	no_of_bits = count_bits(param->mask);
 
-	return show_cache_info(sum_llc_perf_miss, no_of_bits, 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, 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 a14d46353865..604690cd8b3e 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 %lu%%\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, size_t span, int no_of_bits)
 {
 	char *token_array[8], temp[512];
@@ -58,9 +85,8 @@ static int check_results(struct resctrl_val_param *param, size_t span, int no_of
 	}
 	fclose(fp);
 
-	return show_cache_info(sum_llc_occu_resc, no_of_bits, span,
-			       MAX_DIFF, MAX_DIFF_PERCENT, runs - 1,
-			       true, true);
+	return show_results_info(sum_llc_occu_resc, no_of_bits, 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 3983226065f3..47b871df2b0e 100644
--- a/tools/testing/selftests/resctrl/resctrl.h
+++ b/tools/testing/selftests/resctrl/resctrl.h
@@ -113,10 +113,8 @@ unsigned int count_bits(unsigned long n);
 void cmt_test_cleanup(void);
 int get_core_sibling(int cpu_no);
 int measure_llc_resctrl(const char *filename, int bm_pid);
-int show_cache_info(unsigned long sum_llc_val, int no_of_bits,
-		    size_t 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,
+		     size_t cache_span, bool lines);
 
 /*
  * cache_portion_size - Calculate the size of a cache portion
-- 
cgit v1.2.3


From 15f298821289d3efba87bb34db29d0ba9780a443 Mon Sep 17 00:00:00 2001
From: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Date: Fri, 15 Dec 2023 17:05:10 +0200
Subject: selftests/resctrl: Create struct for input parameters
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

resctrl_tests reads a set of parameters and passes them individually
for each tests which causes variations in the call signature between
the tests.

Add struct input_params to hold all input parameters. It can be easily
passed to every test without varying the call signature.

Signed-off-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/cat_test.c      | 20 ++++----
 tools/testing/selftests/resctrl/cmt_test.c      | 16 +++----
 tools/testing/selftests/resctrl/mba_test.c      |  9 ++--
 tools/testing/selftests/resctrl/mbm_test.c      |  9 ++--
 tools/testing/selftests/resctrl/resctrl.h       | 28 +++++++----
 tools/testing/selftests/resctrl/resctrl_tests.c | 63 ++++++++++++++-----------
 tools/testing/selftests/resctrl/resctrl_val.c   | 21 +++++----
 7 files changed, 95 insertions(+), 71 deletions(-)

(limited to 'tools/testing/selftests/resctrl/cmt_test.c')

diff --git a/tools/testing/selftests/resctrl/cat_test.c b/tools/testing/selftests/resctrl/cat_test.c
index fa95433297c9..272132ff7337 100644
--- a/tools/testing/selftests/resctrl/cat_test.c
+++ b/tools/testing/selftests/resctrl/cat_test.c
@@ -135,6 +135,7 @@ void cat_test_cleanup(void)
 
 /*
  * cat_test - Execute CAT benchmark and measure cache misses
+ * @uparams:		User supplied parameters
  * @param:		Parameters passed to cat_test()
  * @span:		Buffer size for the benchmark
  * @current_mask	Start mask for the first iteration
@@ -151,7 +152,8 @@ void cat_test_cleanup(void)
  *
  * Return:		0 when the test was run, < 0 on error.
  */
-static int cat_test(struct resctrl_val_param *param, size_t span, unsigned long current_mask)
+static int cat_test(const struct user_params *uparams, struct resctrl_val_param *param,
+		    size_t span, unsigned long current_mask)
 {
 	char *resctrl_val = param->resctrl_val;
 	struct perf_event_read pe_read;
@@ -168,7 +170,7 @@ static int cat_test(struct resctrl_val_param *param, size_t span, unsigned long
 	bm_pid = getpid();
 
 	/* Taskset benchmark to specified cpu */
-	ret = taskset_benchmark(bm_pid, param->cpu_no, &old_affinity);
+	ret = taskset_benchmark(bm_pid, uparams->cpu, &old_affinity);
 	if (ret)
 		return ret;
 
@@ -180,7 +182,7 @@ static int cat_test(struct resctrl_val_param *param, size_t span, unsigned long
 
 	perf_event_attr_initialize(&pea, PERF_COUNT_HW_CACHE_MISSES);
 	perf_event_initialize_read_format(&pe_read);
-	pe_fd = perf_open(&pea, bm_pid, param->cpu_no);
+	pe_fd = perf_open(&pea, bm_pid, uparams->cpu);
 	if (pe_fd < 0) {
 		ret = -1;
 		goto reset_affinity;
@@ -194,11 +196,11 @@ static int cat_test(struct resctrl_val_param *param, size_t span, unsigned long
 
 	while (current_mask) {
 		snprintf(schemata, sizeof(schemata), "%lx", param->mask & ~current_mask);
-		ret = write_schemata("", schemata, param->cpu_no, param->resctrl_val);
+		ret = write_schemata("", schemata, uparams->cpu, param->resctrl_val);
 		if (ret)
 			goto free_buf;
 		snprintf(schemata, sizeof(schemata), "%lx", current_mask);
-		ret = write_schemata(param->ctrlgrp, schemata, param->cpu_no, param->resctrl_val);
+		ret = write_schemata(param->ctrlgrp, schemata, uparams->cpu, param->resctrl_val);
 		if (ret)
 			goto free_buf;
 
@@ -229,10 +231,11 @@ reset_affinity:
 	return ret;
 }
 
-int cat_perf_miss_val(int cpu_no, int n, char *cache_type)
+int cat_perf_miss_val(const struct user_params *uparams, char *cache_type)
 {
 	unsigned long long_mask, start_mask, full_cache_mask;
 	unsigned long cache_total_size = 0;
+	int n = uparams->bits;
 	unsigned int start;
 	int count_of_bits;
 	size_t span;
@@ -247,7 +250,7 @@ int cat_perf_miss_val(int cpu_no, int n, char *cache_type)
 		return ret;
 
 	/* Get L3/L2 cache size */
-	ret = get_cache_size(cpu_no, cache_type, &cache_total_size);
+	ret = get_cache_size(uparams->cpu, cache_type, &cache_total_size);
 	if (ret)
 		return ret;
 	ksft_print_msg("Cache size :%lu\n", cache_total_size);
@@ -267,7 +270,6 @@ int cat_perf_miss_val(int cpu_no, int n, char *cache_type)
 
 	struct resctrl_val_param param = {
 		.resctrl_val	= CAT_STR,
-		.cpu_no		= cpu_no,
 		.ctrlgrp	= "c1",
 		.filename	= RESULT_FILE_NAME,
 		.num_of_runs	= 0,
@@ -277,7 +279,7 @@ int cat_perf_miss_val(int cpu_no, int n, char *cache_type)
 
 	remove(param.filename);
 
-	ret = cat_test(&param, span, start_mask);
+	ret = cat_test(uparams, &param, span, start_mask);
 	if (ret)
 		goto out;
 
diff --git a/tools/testing/selftests/resctrl/cmt_test.c b/tools/testing/selftests/resctrl/cmt_test.c
index 604690cd8b3e..a5d0c0878c42 100644
--- a/tools/testing/selftests/resctrl/cmt_test.c
+++ b/tools/testing/selftests/resctrl/cmt_test.c
@@ -16,7 +16,7 @@
 #define MAX_DIFF		2000000
 #define MAX_DIFF_PERCENT	15
 
-static int cmt_setup(struct resctrl_val_param *p)
+static int cmt_setup(const struct user_params *uparams, struct resctrl_val_param *p)
 {
 	/* Run NUM_OF_RUNS times */
 	if (p->num_of_runs >= NUM_OF_RUNS)
@@ -94,11 +94,12 @@ void cmt_test_cleanup(void)
 	remove(RESULT_FILE_NAME);
 }
 
-int cmt_resctrl_val(int cpu_no, int n, const char * const *benchmark_cmd)
+int cmt_resctrl_val(const struct user_params *uparams)
 {
-	const char * const *cmd = benchmark_cmd;
+	const char * const *cmd = uparams->benchmark_cmd;
 	const char *new_cmd[BENCHMARK_ARGS];
 	unsigned long cache_total_size = 0;
+	int n = uparams->bits ? : 5;
 	unsigned long long_mask;
 	char *span_str = NULL;
 	int count_of_bits;
@@ -109,7 +110,7 @@ int cmt_resctrl_val(int cpu_no, int n, const char * const *benchmark_cmd)
 	if (ret)
 		return ret;
 
-	ret = get_cache_size(cpu_no, "L3", &cache_total_size);
+	ret = get_cache_size(uparams->cpu, "L3", &cache_total_size);
 	if (ret)
 		return ret;
 	ksft_print_msg("Cache size :%lu\n", cache_total_size);
@@ -126,7 +127,6 @@ int cmt_resctrl_val(int cpu_no, int n, const char * const *benchmark_cmd)
 		.resctrl_val	= CMT_STR,
 		.ctrlgrp	= "c1",
 		.mongrp		= "m1",
-		.cpu_no		= cpu_no,
 		.filename	= RESULT_FILE_NAME,
 		.mask		= ~(long_mask << n) & long_mask,
 		.num_of_runs	= 0,
@@ -137,8 +137,8 @@ int cmt_resctrl_val(int cpu_no, int n, const char * const *benchmark_cmd)
 
 	if (strcmp(cmd[0], "fill_buf") == 0) {
 		/* Duplicate the command to be able to replace span in it */
-		for (i = 0; benchmark_cmd[i]; i++)
-			new_cmd[i] = benchmark_cmd[i];
+		for (i = 0; uparams->benchmark_cmd[i]; i++)
+			new_cmd[i] = uparams->benchmark_cmd[i];
 		new_cmd[i] = NULL;
 
 		ret = asprintf(&span_str, "%zu", span);
@@ -150,7 +150,7 @@ int cmt_resctrl_val(int cpu_no, int n, const char * const *benchmark_cmd)
 
 	remove(RESULT_FILE_NAME);
 
-	ret = resctrl_val(cmd, &param);
+	ret = resctrl_val(uparams, cmd, &param);
 	if (ret)
 		goto out;
 
diff --git a/tools/testing/selftests/resctrl/mba_test.c b/tools/testing/selftests/resctrl/mba_test.c
index e907adf7cd25..8e54bc508a75 100644
--- a/tools/testing/selftests/resctrl/mba_test.c
+++ b/tools/testing/selftests/resctrl/mba_test.c
@@ -22,7 +22,7 @@
  * con_mon grp, mon_grp in resctrl FS.
  * For each allocation, run 5 times in order to get average values.
  */
-static int mba_setup(struct resctrl_val_param *p)
+static int mba_setup(const struct user_params *uparams, struct resctrl_val_param *p)
 {
 	static int runs_per_allocation, allocation = 100;
 	char allocation_str[64];
@@ -40,7 +40,7 @@ static int mba_setup(struct resctrl_val_param *p)
 
 	sprintf(allocation_str, "%d", allocation);
 
-	ret = write_schemata(p->ctrlgrp, allocation_str, p->cpu_no,
+	ret = write_schemata(p->ctrlgrp, allocation_str, uparams->cpu,
 			     p->resctrl_val);
 	if (ret < 0)
 		return ret;
@@ -141,13 +141,12 @@ void mba_test_cleanup(void)
 	remove(RESULT_FILE_NAME);
 }
 
-int mba_schemata_change(int cpu_no, const char * const *benchmark_cmd)
+int mba_schemata_change(const struct user_params *uparams)
 {
 	struct resctrl_val_param param = {
 		.resctrl_val	= MBA_STR,
 		.ctrlgrp	= "c1",
 		.mongrp		= "m1",
-		.cpu_no		= cpu_no,
 		.filename	= RESULT_FILE_NAME,
 		.bw_report	= "reads",
 		.setup		= mba_setup
@@ -156,7 +155,7 @@ int mba_schemata_change(int cpu_no, const char * const *benchmark_cmd)
 
 	remove(RESULT_FILE_NAME);
 
-	ret = resctrl_val(benchmark_cmd, &param);
+	ret = resctrl_val(uparams, uparams->benchmark_cmd, &param);
 	if (ret)
 		goto out;
 
diff --git a/tools/testing/selftests/resctrl/mbm_test.c b/tools/testing/selftests/resctrl/mbm_test.c
index 721b3ecbc158..ea951cfae5fe 100644
--- a/tools/testing/selftests/resctrl/mbm_test.c
+++ b/tools/testing/selftests/resctrl/mbm_test.c
@@ -86,7 +86,7 @@ static int check_results(size_t span)
 	return ret;
 }
 
-static int mbm_setup(struct resctrl_val_param *p)
+static int mbm_setup(const struct user_params *uparams, struct resctrl_val_param *p)
 {
 	int ret = 0;
 
@@ -96,7 +96,7 @@ static int mbm_setup(struct resctrl_val_param *p)
 
 	/* Set up shemata with 100% allocation on the first run. */
 	if (p->num_of_runs == 0 && validate_resctrl_feature_request("MB", NULL))
-		ret = write_schemata(p->ctrlgrp, "100", p->cpu_no,
+		ret = write_schemata(p->ctrlgrp, "100", uparams->cpu,
 				     p->resctrl_val);
 
 	p->num_of_runs++;
@@ -109,13 +109,12 @@ void mbm_test_cleanup(void)
 	remove(RESULT_FILE_NAME);
 }
 
-int mbm_bw_change(int cpu_no, const char * const *benchmark_cmd)
+int mbm_bw_change(const struct user_params *uparams)
 {
 	struct resctrl_val_param param = {
 		.resctrl_val	= MBM_STR,
 		.ctrlgrp	= "c1",
 		.mongrp		= "m1",
-		.cpu_no		= cpu_no,
 		.filename	= RESULT_FILE_NAME,
 		.bw_report	= "reads",
 		.setup		= mbm_setup
@@ -124,7 +123,7 @@ int mbm_bw_change(int cpu_no, const char * const *benchmark_cmd)
 
 	remove(RESULT_FILE_NAME);
 
-	ret = resctrl_val(benchmark_cmd, &param);
+	ret = resctrl_val(uparams, uparams->benchmark_cmd, &param);
 	if (ret)
 		goto out;
 
diff --git a/tools/testing/selftests/resctrl/resctrl.h b/tools/testing/selftests/resctrl/resctrl.h
index 94347acafe55..199ba91a78f7 100644
--- a/tools/testing/selftests/resctrl/resctrl.h
+++ b/tools/testing/selftests/resctrl/resctrl.h
@@ -44,12 +44,23 @@
 		exit(EXIT_FAILURE);		\
 	} while (0)
 
+/*
+ * user_params:		User supplied parameters
+ * @cpu:		CPU number to which the benchmark will be bound to
+ * @bits:		Number of bits used for cache allocation size
+ * @benchmark_cmd:	Benchmark command to run during (some of the) tests
+ */
+struct user_params {
+	int cpu;
+	int bits;
+	const char *benchmark_cmd[BENCHMARK_ARGS];
+};
+
 /*
  * resctrl_val_param:	resctrl test parameters
  * @resctrl_val:	Resctrl feature (Eg: mbm, mba.. etc)
  * @ctrlgrp:		Name of the control monitor group (con_mon grp)
  * @mongrp:		Name of the monitor group (mon grp)
- * @cpu_no:		CPU number to which the benchmark would be binded
  * @filename:		Name of file to which the o/p should be written
  * @bw_report:		Bandwidth report type (reads vs writes)
  * @setup:		Call back function to setup test environment
@@ -58,12 +69,12 @@ struct resctrl_val_param {
 	char		*resctrl_val;
 	char		ctrlgrp[64];
 	char		mongrp[64];
-	int		cpu_no;
 	char		filename[64];
 	char		*bw_report;
 	unsigned long	mask;
 	int		num_of_runs;
-	int		(*setup)(struct resctrl_val_param *param);
+	int		(*setup)(const struct user_params *uparams,
+				 struct resctrl_val_param *param);
 };
 
 struct perf_event_read {
@@ -110,11 +121,12 @@ unsigned char *alloc_buffer(size_t buf_size, int memflush);
 void mem_flush(unsigned char *buf, size_t buf_size);
 void fill_cache_read(unsigned char *buf, size_t buf_size, bool once);
 int run_fill_buf(size_t buf_size, int memflush, int op, bool once);
-int resctrl_val(const char * const *benchmark_cmd, struct resctrl_val_param *param);
-int mbm_bw_change(int cpu_no, const char * const *benchmark_cmd);
+int resctrl_val(const struct user_params *uparams, const char * const *benchmark_cmd,
+		struct resctrl_val_param *param);
+int mbm_bw_change(const struct user_params *uparams);
 void tests_cleanup(void);
 void mbm_test_cleanup(void);
-int mba_schemata_change(int cpu_no, const char * const *benchmark_cmd);
+int mba_schemata_change(const struct user_params *uparams);
 void mba_test_cleanup(void);
 unsigned long create_bit_mask(unsigned int start, unsigned int len);
 unsigned int count_contiguous_bits(unsigned long val, unsigned int *start);
@@ -125,8 +137,8 @@ void ctrlc_handler(int signum, siginfo_t *info, void *ptr);
 int signal_handler_register(void);
 void signal_handler_unregister(void);
 void cat_test_cleanup(void);
-int cat_perf_miss_val(int cpu_no, int no_of_bits, char *cache_type);
-int cmt_resctrl_val(int cpu_no, int n, const char * const *benchmark_cmd);
+int cat_perf_miss_val(const struct user_params *uparams, char *cache_type);
+int cmt_resctrl_val(const struct user_params *uparams);
 unsigned int count_bits(unsigned long n);
 void cmt_test_cleanup(void);
 
diff --git a/tools/testing/selftests/resctrl/resctrl_tests.c b/tools/testing/selftests/resctrl/resctrl_tests.c
index f0d573aa363b..3059a124ac59 100644
--- a/tools/testing/selftests/resctrl/resctrl_tests.c
+++ b/tools/testing/selftests/resctrl/resctrl_tests.c
@@ -96,7 +96,7 @@ static void test_cleanup(void)
 	signal_handler_unregister();
 }
 
-static void run_mbm_test(const char * const *benchmark_cmd, int cpu_no)
+static void run_mbm_test(const struct user_params *uparams)
 {
 	int res;
 
@@ -114,7 +114,7 @@ static void run_mbm_test(const char * const *benchmark_cmd, int cpu_no)
 		goto cleanup;
 	}
 
-	res = mbm_bw_change(cpu_no, benchmark_cmd);
+	res = mbm_bw_change(uparams);
 	ksft_test_result(!res, "MBM: bw change\n");
 	if ((get_vendor() == ARCH_INTEL) && res)
 		ksft_print_msg("Intel MBM may be inaccurate when Sub-NUMA Clustering is enabled. Check BIOS configuration.\n");
@@ -123,7 +123,7 @@ cleanup:
 	test_cleanup();
 }
 
-static void run_mba_test(const char * const *benchmark_cmd, int cpu_no)
+static void run_mba_test(const struct user_params *uparams)
 {
 	int res;
 
@@ -141,14 +141,14 @@ static void run_mba_test(const char * const *benchmark_cmd, int cpu_no)
 		goto cleanup;
 	}
 
-	res = mba_schemata_change(cpu_no, benchmark_cmd);
+	res = mba_schemata_change(uparams);
 	ksft_test_result(!res, "MBA: schemata change\n");
 
 cleanup:
 	test_cleanup();
 }
 
-static void run_cmt_test(const char * const *benchmark_cmd, int cpu_no)
+static void run_cmt_test(const struct user_params *uparams)
 {
 	int res;
 
@@ -165,7 +165,7 @@ static void run_cmt_test(const char * const *benchmark_cmd, int cpu_no)
 		goto cleanup;
 	}
 
-	res = cmt_resctrl_val(cpu_no, 5, benchmark_cmd);
+	res = cmt_resctrl_val(uparams);
 	ksft_test_result(!res, "CMT: test\n");
 	if ((get_vendor() == ARCH_INTEL) && res)
 		ksft_print_msg("Intel CMT may be inaccurate when Sub-NUMA Clustering is enabled. Check BIOS configuration.\n");
@@ -174,7 +174,7 @@ cleanup:
 	test_cleanup();
 }
 
-static void run_cat_test(int cpu_no, int no_of_bits)
+static void run_cat_test(const struct user_params *uparams)
 {
 	int res;
 
@@ -190,22 +190,31 @@ static void run_cat_test(int cpu_no, int no_of_bits)
 		goto cleanup;
 	}
 
-	res = cat_perf_miss_val(cpu_no, no_of_bits, "L3");
+	res = cat_perf_miss_val(uparams, "L3");
 	ksft_test_result(!res, "CAT: test\n");
 
 cleanup:
 	test_cleanup();
 }
 
+static void init_user_params(struct user_params *uparams)
+{
+	memset(uparams, 0, sizeof(*uparams));
+
+	uparams->cpu = 1;
+	uparams->bits = 0;
+}
+
 int main(int argc, char **argv)
 {
 	bool mbm_test = true, mba_test = true, cmt_test = true;
-	const char *benchmark_cmd[BENCHMARK_ARGS] = {};
-	int c, cpu_no = 1, i, no_of_bits = 0;
+	struct user_params uparams;
 	char *span_str = NULL;
 	bool cat_test = true;
 	int tests = 0;
-	int ret;
+	int ret, c, i;
+
+	init_user_params(&uparams);
 
 	while ((c = getopt(argc, argv, "ht:b:n:p:")) != -1) {
 		char *token;
@@ -223,8 +232,8 @@ int main(int argc, char **argv)
 
 			/* Extract benchmark command from command line. */
 			for (i = 0; i < argc - optind; i++)
-				benchmark_cmd[i] = argv[i + optind];
-			benchmark_cmd[i] = NULL;
+				uparams.benchmark_cmd[i] = argv[i + optind];
+			uparams.benchmark_cmd[i] = NULL;
 
 			goto last_arg;
 		case 't':
@@ -256,11 +265,11 @@ int main(int argc, char **argv)
 			}
 			break;
 		case 'p':
-			cpu_no = atoi(optarg);
+			uparams.cpu = atoi(optarg);
 			break;
 		case 'n':
-			no_of_bits = atoi(optarg);
-			if (no_of_bits <= 0) {
+			uparams.bits = atoi(optarg);
+			if (uparams.bits <= 0) {
 				printf("Bail out! invalid argument for no_of_bits\n");
 				return -1;
 			}
@@ -295,32 +304,32 @@ last_arg:
 
 	filter_dmesg();
 
-	if (!benchmark_cmd[0]) {
+	if (!uparams.benchmark_cmd[0]) {
 		/* If no benchmark is given by "-b" argument, use fill_buf. */
-		benchmark_cmd[0] = "fill_buf";
+		uparams.benchmark_cmd[0] = "fill_buf";
 		ret = asprintf(&span_str, "%u", DEFAULT_SPAN);
 		if (ret < 0)
 			ksft_exit_fail_msg("Out of memory!\n");
-		benchmark_cmd[1] = span_str;
-		benchmark_cmd[2] = "1";
-		benchmark_cmd[3] = "0";
-		benchmark_cmd[4] = "false";
-		benchmark_cmd[5] = NULL;
+		uparams.benchmark_cmd[1] = span_str;
+		uparams.benchmark_cmd[2] = "1";
+		uparams.benchmark_cmd[3] = "0";
+		uparams.benchmark_cmd[4] = "false";
+		uparams.benchmark_cmd[5] = NULL;
 	}
 
 	ksft_set_plan(tests ? : 4);
 
 	if (mbm_test)
-		run_mbm_test(benchmark_cmd, cpu_no);
+		run_mbm_test(&uparams);
 
 	if (mba_test)
-		run_mba_test(benchmark_cmd, cpu_no);
+		run_mba_test(&uparams);
 
 	if (cmt_test)
-		run_cmt_test(benchmark_cmd, cpu_no);
+		run_cmt_test(&uparams);
 
 	if (cat_test)
-		run_cat_test(cpu_no, no_of_bits);
+		run_cat_test(&uparams);
 
 	free(span_str);
 	ksft_finished();
diff --git a/tools/testing/selftests/resctrl/resctrl_val.c b/tools/testing/selftests/resctrl/resctrl_val.c
index 6574a13f3919..6d0a35e8bd02 100644
--- a/tools/testing/selftests/resctrl/resctrl_val.c
+++ b/tools/testing/selftests/resctrl/resctrl_val.c
@@ -593,8 +593,9 @@ static void initialize_llc_occu_resctrl(const char *ctrlgrp, const char *mongrp,
 		set_cmt_path(ctrlgrp, mongrp, resource_id);
 }
 
-static int
-measure_vals(struct resctrl_val_param *param, unsigned long *bw_resc_start)
+static int measure_vals(const struct user_params *uparams,
+			struct resctrl_val_param *param,
+			unsigned long *bw_resc_start)
 {
 	unsigned long bw_resc, bw_resc_end;
 	float bw_imc;
@@ -607,7 +608,7 @@ measure_vals(struct resctrl_val_param *param, unsigned long *bw_resc_start)
 	 * Compare the two values to validate resctrl value.
 	 * It takes 1sec to measure the data.
 	 */
-	ret = get_mem_bw_imc(param->cpu_no, param->bw_report, &bw_imc);
+	ret = get_mem_bw_imc(uparams->cpu, param->bw_report, &bw_imc);
 	if (ret < 0)
 		return ret;
 
@@ -683,12 +684,14 @@ static void run_benchmark(int signum, siginfo_t *info, void *ucontext)
 /*
  * resctrl_val:	execute benchmark and measure memory bandwidth on
  *			the benchmark
+ * @uparams:		user supplied parameters
  * @benchmark_cmd:	benchmark command and its arguments
  * @param:		parameters passed to resctrl_val()
  *
  * Return:		0 when the test was run, < 0 on error.
  */
-int resctrl_val(const char * const *benchmark_cmd, struct resctrl_val_param *param)
+int resctrl_val(const struct user_params *uparams, const char * const *benchmark_cmd,
+		struct resctrl_val_param *param)
 {
 	char *resctrl_val = param->resctrl_val;
 	unsigned long bw_resc_start = 0;
@@ -777,7 +780,7 @@ int resctrl_val(const char * const *benchmark_cmd, struct resctrl_val_param *par
 	value.sival_ptr = (void *)benchmark_cmd;
 
 	/* Taskset benchmark to specified cpu */
-	ret = taskset_benchmark(bm_pid, param->cpu_no, NULL);
+	ret = taskset_benchmark(bm_pid, uparams->cpu, NULL);
 	if (ret)
 		goto out;
 
@@ -794,10 +797,10 @@ int resctrl_val(const char * const *benchmark_cmd, struct resctrl_val_param *par
 			goto out;
 
 		initialize_mem_bw_resctrl(param->ctrlgrp, param->mongrp,
-					  param->cpu_no, resctrl_val);
+					  uparams->cpu, resctrl_val);
 	} else if (!strncmp(resctrl_val, CMT_STR, sizeof(CMT_STR)))
 		initialize_llc_occu_resctrl(param->ctrlgrp, param->mongrp,
-					    param->cpu_no, resctrl_val);
+					    uparams->cpu, resctrl_val);
 
 	/* Parent waits for child to be ready. */
 	close(pipefd[1]);
@@ -823,7 +826,7 @@ int resctrl_val(const char * const *benchmark_cmd, struct resctrl_val_param *par
 
 	/* Test runs until the callback setup() tells the test to stop. */
 	while (1) {
-		ret = param->setup(param);
+		ret = param->setup(uparams, param);
 		if (ret == END_OF_TESTS) {
 			ret = 0;
 			break;
@@ -833,7 +836,7 @@ int resctrl_val(const char * const *benchmark_cmd, struct resctrl_val_param *par
 
 		if (!strncmp(resctrl_val, MBM_STR, sizeof(MBM_STR)) ||
 		    !strncmp(resctrl_val, MBA_STR, sizeof(MBA_STR))) {
-			ret = measure_vals(param, &bw_resc_start);
+			ret = measure_vals(uparams, param, &bw_resc_start);
 			if (ret)
 				break;
 		} else if (!strncmp(resctrl_val, CMT_STR, sizeof(CMT_STR))) {
-- 
cgit v1.2.3


From c603ff5bb830b8c22dae56ca3ca5ceb5c103525b Mon Sep 17 00:00:00 2001
From: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Date: Fri, 15 Dec 2023 17:05:11 +0200
Subject: selftests/resctrl: Introduce generalized test framework
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Each test currently has a "run test" function in per test file and
another resctrl_tests.c. The functions in resctrl_tests.c are almost
identical.

Generalize the one in resctrl_tests.c such that it can be shared
between all of the tests. It makes adding new tests easier and removes
the per test if () forests.

Also add comment to CPU vendor IDs that they must be defined as bits
for a bitmask.

Signed-off-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/cat_test.c      |  18 ++-
 tools/testing/selftests/resctrl/cmt_test.c      |  17 ++-
 tools/testing/selftests/resctrl/mba_test.c      |  16 ++-
 tools/testing/selftests/resctrl/mbm_test.c      |  18 ++-
 tools/testing/selftests/resctrl/resctrl.h       |  35 +++++-
 tools/testing/selftests/resctrl/resctrl_tests.c | 160 ++++++++----------------
 tools/testing/selftests/resctrl/resctrlfs.c     |   5 +
 7 files changed, 148 insertions(+), 121 deletions(-)

(limited to 'tools/testing/selftests/resctrl/cmt_test.c')

diff --git a/tools/testing/selftests/resctrl/cat_test.c b/tools/testing/selftests/resctrl/cat_test.c
index 272132ff7337..a9b4583620d0 100644
--- a/tools/testing/selftests/resctrl/cat_test.c
+++ b/tools/testing/selftests/resctrl/cat_test.c
@@ -231,7 +231,7 @@ reset_affinity:
 	return ret;
 }
 
-int cat_perf_miss_val(const struct user_params *uparams, char *cache_type)
+static int cat_run_test(const struct resctrl_test *test, const struct user_params *uparams)
 {
 	unsigned long long_mask, start_mask, full_cache_mask;
 	unsigned long cache_total_size = 0;
@@ -241,16 +241,16 @@ int cat_perf_miss_val(const struct user_params *uparams, char *cache_type)
 	size_t span;
 	int ret;
 
-	ret = get_full_cbm(cache_type, &full_cache_mask);
+	ret = get_full_cbm(test->resource, &full_cache_mask);
 	if (ret)
 		return ret;
 	/* Get the largest contiguous exclusive portion of the cache */
-	ret = get_mask_no_shareable(cache_type, &long_mask);
+	ret = get_mask_no_shareable(test->resource, &long_mask);
 	if (ret)
 		return ret;
 
 	/* Get L3/L2 cache size */
-	ret = get_cache_size(uparams->cpu, cache_type, &cache_total_size);
+	ret = get_cache_size(uparams->cpu, test->resource, &cache_total_size);
 	if (ret)
 		return ret;
 	ksft_print_msg("Cache size :%lu\n", cache_total_size);
@@ -283,9 +283,17 @@ int cat_perf_miss_val(const struct user_params *uparams, char *cache_type)
 	if (ret)
 		goto out;
 
-	ret = check_results(&param, cache_type, cache_total_size, full_cache_mask, start_mask);
+	ret = check_results(&param, test->resource,
+			    cache_total_size, full_cache_mask, start_mask);
 out:
 	cat_test_cleanup();
 
 	return ret;
 }
+
+struct resctrl_test l3_cat_test = {
+	.name = "CAT",
+	.resource = "L3",
+	.feature_check = test_resource_feature_check,
+	.run_test = cat_run_test,
+};
diff --git a/tools/testing/selftests/resctrl/cmt_test.c b/tools/testing/selftests/resctrl/cmt_test.c
index a5d0c0878c42..c01980039118 100644
--- a/tools/testing/selftests/resctrl/cmt_test.c
+++ b/tools/testing/selftests/resctrl/cmt_test.c
@@ -94,7 +94,7 @@ void cmt_test_cleanup(void)
 	remove(RESULT_FILE_NAME);
 }
 
-int cmt_resctrl_val(const struct user_params *uparams)
+static int cmt_run_test(const struct resctrl_test *test, const struct user_params *uparams)
 {
 	const char * const *cmd = uparams->benchmark_cmd;
 	const char *new_cmd[BENCHMARK_ARGS];
@@ -155,6 +155,8 @@ int cmt_resctrl_val(const struct user_params *uparams)
 		goto out;
 
 	ret = check_results(&param, span, n);
+	if (ret && (get_vendor() == ARCH_INTEL))
+		ksft_print_msg("Intel CMT may be inaccurate when Sub-NUMA Clustering is enabled. Check BIOS configuration.\n");
 
 out:
 	cmt_test_cleanup();
@@ -162,3 +164,16 @@ out:
 
 	return ret;
 }
+
+static bool cmt_feature_check(const struct resctrl_test *test)
+{
+	return test_resource_feature_check(test) &&
+	       validate_resctrl_feature_request("L3_MON", "llc_occupancy");
+}
+
+struct resctrl_test cmt_test = {
+	.name = "CMT",
+	.resource = "L3",
+	.feature_check = cmt_feature_check,
+	.run_test = cmt_run_test,
+};
diff --git a/tools/testing/selftests/resctrl/mba_test.c b/tools/testing/selftests/resctrl/mba_test.c
index 8e54bc508a75..c218af24f91d 100644
--- a/tools/testing/selftests/resctrl/mba_test.c
+++ b/tools/testing/selftests/resctrl/mba_test.c
@@ -141,7 +141,7 @@ void mba_test_cleanup(void)
 	remove(RESULT_FILE_NAME);
 }
 
-int mba_schemata_change(const struct user_params *uparams)
+static int mba_run_test(const struct resctrl_test *test, const struct user_params *uparams)
 {
 	struct resctrl_val_param param = {
 		.resctrl_val	= MBA_STR,
@@ -166,3 +166,17 @@ out:
 
 	return ret;
 }
+
+static bool mba_feature_check(const struct resctrl_test *test)
+{
+	return test_resource_feature_check(test) &&
+	       validate_resctrl_feature_request("L3_MON", "mbm_local_bytes");
+}
+
+struct resctrl_test mba_test = {
+	.name = "MBA",
+	.resource = "MB",
+	.vendor_specific = ARCH_INTEL,
+	.feature_check = mba_feature_check,
+	.run_test = mba_run_test,
+};
diff --git a/tools/testing/selftests/resctrl/mbm_test.c b/tools/testing/selftests/resctrl/mbm_test.c
index ea951cfae5fe..919b10459c22 100644
--- a/tools/testing/selftests/resctrl/mbm_test.c
+++ b/tools/testing/selftests/resctrl/mbm_test.c
@@ -109,7 +109,7 @@ void mbm_test_cleanup(void)
 	remove(RESULT_FILE_NAME);
 }
 
-int mbm_bw_change(const struct user_params *uparams)
+static int mbm_run_test(const struct resctrl_test *test, const struct user_params *uparams)
 {
 	struct resctrl_val_param param = {
 		.resctrl_val	= MBM_STR,
@@ -128,9 +128,25 @@ int mbm_bw_change(const struct user_params *uparams)
 		goto out;
 
 	ret = check_results(DEFAULT_SPAN);
+	if (ret && (get_vendor() == ARCH_INTEL))
+		ksft_print_msg("Intel MBM may be inaccurate when Sub-NUMA Clustering is enabled. Check BIOS configuration.\n");
 
 out:
 	mbm_test_cleanup();
 
 	return ret;
 }
+
+static bool mbm_feature_check(const struct resctrl_test *test)
+{
+	return validate_resctrl_feature_request("L3_MON", "mbm_total_bytes") &&
+	       validate_resctrl_feature_request("L3_MON", "mbm_local_bytes");
+}
+
+struct resctrl_test mbm_test = {
+	.name = "MBM",
+	.resource = "MB",
+	.vendor_specific = ARCH_INTEL,
+	.feature_check = mbm_feature_check,
+	.run_test = mbm_run_test,
+};
diff --git a/tools/testing/selftests/resctrl/resctrl.h b/tools/testing/selftests/resctrl/resctrl.h
index 199ba91a78f7..1168364b4cc2 100644
--- a/tools/testing/selftests/resctrl/resctrl.h
+++ b/tools/testing/selftests/resctrl/resctrl.h
@@ -28,6 +28,12 @@
 #define PHYS_ID_PATH		"/sys/devices/system/cpu/cpu"
 #define INFO_PATH		"/sys/fs/resctrl/info"
 
+/*
+ * CPU vendor IDs
+ *
+ * Define as bits because they're used for vendor_specific bitmask in
+ * the struct resctrl_test.
+ */
 #define ARCH_INTEL     1
 #define ARCH_AMD       2
 
@@ -56,6 +62,25 @@ struct user_params {
 	const char *benchmark_cmd[BENCHMARK_ARGS];
 };
 
+/*
+ * resctrl_test:	resctrl test definition
+ * @name:		Test name
+ * @resource:		Resource to test (e.g., MB, L3, L2, etc.)
+ * @vendor_specific:	Bitmask for vendor-specific tests (can be 0 for universal tests)
+ * @disabled:		Test is disabled
+ * @feature_check:	Callback to check required resctrl features
+ * @run_test:		Callback to run the test
+ */
+struct resctrl_test {
+	const char	*name;
+	const char	*resource;
+	unsigned int	vendor_specific;
+	bool		disabled;
+	bool		(*feature_check)(const struct resctrl_test *test);
+	int		(*run_test)(const struct resctrl_test *test,
+				    const struct user_params *uparams);
+};
+
 /*
  * resctrl_val_param:	resctrl test parameters
  * @resctrl_val:	Resctrl feature (Eg: mbm, mba.. etc)
@@ -108,6 +133,7 @@ int mount_resctrlfs(void);
 int umount_resctrlfs(void);
 int validate_bw_report_request(char *bw_report);
 bool validate_resctrl_feature_request(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);
 int taskset_restore(pid_t bm_pid, cpu_set_t *old_affinity);
@@ -123,10 +149,8 @@ void fill_cache_read(unsigned char *buf, size_t buf_size, bool once);
 int run_fill_buf(size_t buf_size, int memflush, int op, bool once);
 int resctrl_val(const struct user_params *uparams, const char * const *benchmark_cmd,
 		struct resctrl_val_param *param);
-int mbm_bw_change(const struct user_params *uparams);
 void tests_cleanup(void);
 void mbm_test_cleanup(void);
-int mba_schemata_change(const struct user_params *uparams);
 void mba_test_cleanup(void);
 unsigned long create_bit_mask(unsigned int start, unsigned int len);
 unsigned int count_contiguous_bits(unsigned long val, unsigned int *start);
@@ -137,8 +161,6 @@ void ctrlc_handler(int signum, siginfo_t *info, void *ptr);
 int signal_handler_register(void);
 void signal_handler_unregister(void);
 void cat_test_cleanup(void);
-int cat_perf_miss_val(const struct user_params *uparams, char *cache_type);
-int cmt_resctrl_val(const struct user_params *uparams);
 unsigned int count_bits(unsigned long n);
 void cmt_test_cleanup(void);
 
@@ -175,4 +197,9 @@ static inline unsigned long cache_portion_size(unsigned long cache_size,
 	return cache_size * count_bits(portion_mask) / bits;
 }
 
+extern struct resctrl_test mbm_test;
+extern struct resctrl_test mba_test;
+extern struct resctrl_test cmt_test;
+extern struct resctrl_test l3_cat_test;
+
 #endif /* RESCTRL_H */
diff --git a/tools/testing/selftests/resctrl/resctrl_tests.c b/tools/testing/selftests/resctrl/resctrl_tests.c
index 3059a124ac59..75fc49ba3efb 100644
--- a/tools/testing/selftests/resctrl/resctrl_tests.c
+++ b/tools/testing/selftests/resctrl/resctrl_tests.c
@@ -14,6 +14,13 @@
 static volatile int sink_target;
 volatile int *value_sink = &sink_target;
 
+static struct resctrl_test *resctrl_tests[] = {
+	&mbm_test,
+	&mba_test,
+	&cmt_test,
+	&l3_cat_test,
+};
+
 static int detect_vendor(void)
 {
 	FILE *inf = fopen("/proc/cpuinfo", "r");
@@ -53,11 +60,16 @@ int get_vendor(void)
 
 static void cmd_help(void)
 {
+	int i;
+
 	printf("usage: resctrl_tests [-h] [-t test list] [-n no_of_bits] [-b benchmark_cmd [option]...]\n");
 	printf("\t-b benchmark_cmd [option]...: run specified benchmark for MBM, MBA and CMT\n");
 	printf("\t   default benchmark is builtin fill_buf\n");
 	printf("\t-t test list: run tests specified in the test list, ");
 	printf("e.g. -t mbm,mba,cmt,cat\n");
+	printf("\t\tSupported tests:\n");
+	for (i = 0; i < ARRAY_SIZE(resctrl_tests); i++)
+		printf("\t\t\t%s\n", resctrl_tests[i]->name);
 	printf("\t-n no_of_bits: run cache tests using specified no of bits in cache bit mask\n");
 	printf("\t-p cpu_no: specify CPU number to run the test. 1 is default\n");
 	printf("\t-h: help\n");
@@ -96,102 +108,41 @@ static void test_cleanup(void)
 	signal_handler_unregister();
 }
 
-static void run_mbm_test(const struct user_params *uparams)
+static bool test_vendor_specific_check(const struct resctrl_test *test)
 {
-	int res;
-
-	ksft_print_msg("Starting MBM BW change ...\n");
-
-	if (test_prepare()) {
-		ksft_exit_fail_msg("Abnormal failure when preparing for the test\n");
-		return;
-	}
-
-	if (!validate_resctrl_feature_request("L3_MON", "mbm_total_bytes") ||
-	    !validate_resctrl_feature_request("L3_MON", "mbm_local_bytes") ||
-	    (get_vendor() != ARCH_INTEL)) {
-		ksft_test_result_skip("Hardware does not support MBM or MBM is disabled\n");
-		goto cleanup;
-	}
-
-	res = mbm_bw_change(uparams);
-	ksft_test_result(!res, "MBM: bw change\n");
-	if ((get_vendor() == ARCH_INTEL) && res)
-		ksft_print_msg("Intel MBM may be inaccurate when Sub-NUMA Clustering is enabled. Check BIOS configuration.\n");
+	if (!test->vendor_specific)
+		return true;
 
-cleanup:
-	test_cleanup();
+	return get_vendor() & test->vendor_specific;
 }
 
-static void run_mba_test(const struct user_params *uparams)
+static void run_single_test(const struct resctrl_test *test, const struct user_params *uparams)
 {
-	int res;
-
-	ksft_print_msg("Starting MBA Schemata change ...\n");
+	int ret;
 
-	if (test_prepare()) {
-		ksft_exit_fail_msg("Abnormal failure when preparing for the test\n");
+	if (test->disabled)
 		return;
-	}
 
-	if (!validate_resctrl_feature_request("MB", NULL) ||
-	    !validate_resctrl_feature_request("L3_MON", "mbm_local_bytes") ||
-	    (get_vendor() != ARCH_INTEL)) {
-		ksft_test_result_skip("Hardware does not support MBA or MBA is disabled\n");
-		goto cleanup;
-	}
-
-	res = mba_schemata_change(uparams);
-	ksft_test_result(!res, "MBA: schemata change\n");
-
-cleanup:
-	test_cleanup();
-}
-
-static void run_cmt_test(const struct user_params *uparams)
-{
-	int res;
-
-	ksft_print_msg("Starting CMT test ...\n");
-
-	if (test_prepare()) {
-		ksft_exit_fail_msg("Abnormal failure when preparing for the test\n");
+	if (!test_vendor_specific_check(test)) {
+		ksft_test_result_skip("Hardware does not support %s\n", test->name);
 		return;
 	}
 
-	if (!validate_resctrl_feature_request("L3_MON", "llc_occupancy") ||
-	    !validate_resctrl_feature_request("L3", NULL)) {
-		ksft_test_result_skip("Hardware does not support CMT or CMT is disabled\n");
-		goto cleanup;
-	}
-
-	res = cmt_resctrl_val(uparams);
-	ksft_test_result(!res, "CMT: test\n");
-	if ((get_vendor() == ARCH_INTEL) && res)
-		ksft_print_msg("Intel CMT may be inaccurate when Sub-NUMA Clustering is enabled. Check BIOS configuration.\n");
-
-cleanup:
-	test_cleanup();
-}
-
-static void run_cat_test(const struct user_params *uparams)
-{
-	int res;
-
-	ksft_print_msg("Starting CAT test ...\n");
+	ksft_print_msg("Starting %s test ...\n", test->name);
 
 	if (test_prepare()) {
 		ksft_exit_fail_msg("Abnormal failure when preparing for the test\n");
 		return;
 	}
 
-	if (!validate_resctrl_feature_request("L3", NULL)) {
-		ksft_test_result_skip("Hardware does not support CAT or CAT is disabled\n");
+	if (!test->feature_check(test)) {
+		ksft_test_result_skip("Hardware does not support %s or %s is disabled\n",
+				      test->name, test->name);
 		goto cleanup;
 	}
 
-	res = cat_perf_miss_val(uparams, "L3");
-	ksft_test_result(!res, "CAT: test\n");
+	ret = test->run_test(test, uparams);
+	ksft_test_result(!ret, "%s: test\n", test->name);
 
 cleanup:
 	test_cleanup();
@@ -207,11 +158,10 @@ static void init_user_params(struct user_params *uparams)
 
 int main(int argc, char **argv)
 {
-	bool mbm_test = true, mba_test = true, cmt_test = true;
+	int tests = ARRAY_SIZE(resctrl_tests);
+	bool test_param_seen = false;
 	struct user_params uparams;
 	char *span_str = NULL;
-	bool cat_test = true;
-	int tests = 0;
 	int ret, c, i;
 
 	init_user_params(&uparams);
@@ -239,25 +189,26 @@ int main(int argc, char **argv)
 		case 't':
 			token = strtok(optarg, ",");
 
-			mbm_test = false;
-			mba_test = false;
-			cmt_test = false;
-			cat_test = false;
+			if (!test_param_seen) {
+				for (i = 0; i < ARRAY_SIZE(resctrl_tests); i++)
+					resctrl_tests[i]->disabled = true;
+				tests = 0;
+				test_param_seen = true;
+			}
 			while (token) {
-				if (!strncmp(token, MBM_STR, sizeof(MBM_STR))) {
-					mbm_test = true;
-					tests++;
-				} else if (!strncmp(token, MBA_STR, sizeof(MBA_STR))) {
-					mba_test = true;
-					tests++;
-				} else if (!strncmp(token, CMT_STR, sizeof(CMT_STR))) {
-					cmt_test = true;
-					tests++;
-				} else if (!strncmp(token, CAT_STR, sizeof(CAT_STR))) {
-					cat_test = true;
-					tests++;
-				} else {
-					printf("invalid argument\n");
+				bool found = false;
+
+				for (i = 0; i < ARRAY_SIZE(resctrl_tests); i++) {
+					if (!strcasecmp(token, resctrl_tests[i]->name)) {
+						if (resctrl_tests[i]->disabled)
+							tests++;
+						resctrl_tests[i]->disabled = false;
+						found = true;
+					}
+				}
+
+				if (!found) {
+					printf("invalid test: %s\n", token);
 
 					return -1;
 				}
@@ -317,19 +268,10 @@ last_arg:
 		uparams.benchmark_cmd[5] = NULL;
 	}
 
-	ksft_set_plan(tests ? : 4);
-
-	if (mbm_test)
-		run_mbm_test(&uparams);
-
-	if (mba_test)
-		run_mba_test(&uparams);
-
-	if (cmt_test)
-		run_cmt_test(&uparams);
+	ksft_set_plan(tests);
 
-	if (cat_test)
-		run_cat_test(&uparams);
+	for (i = 0; i < ARRAY_SIZE(resctrl_tests); i++)
+		run_single_test(resctrl_tests[i], &uparams);
 
 	free(span_str);
 	ksft_finished();
diff --git a/tools/testing/selftests/resctrl/resctrlfs.c b/tools/testing/selftests/resctrl/resctrlfs.c
index 1bcb9aa96cc2..140f65467ddb 100644
--- a/tools/testing/selftests/resctrl/resctrlfs.c
+++ b/tools/testing/selftests/resctrl/resctrlfs.c
@@ -706,6 +706,11 @@ bool validate_resctrl_feature_request(const char *resource, const char *feature)
 	return !!res;
 }
 
+bool test_resource_feature_check(const struct resctrl_test *test)
+{
+	return validate_resctrl_feature_request(test->resource, NULL);
+}
+
 int filter_dmesg(void)
 {
 	char line[1024];
-- 
cgit v1.2.3


From ca1608875ae21bb40a7731b81bc0e2c95622d502 Mon Sep 17 00:00:00 2001
From: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Date: Fri, 15 Dec 2023 17:05:12 +0200
Subject: selftests/resctrl: Pass write_schemata() resource instead of test
 name
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

write_schemata() takes the test name as an argument and determines the
relevant resource based on the test name. Such mapping from name to
resource does not really belong to resctrlfs.c that should provide
only generic, test-independent functions.

Pass the resource stored in the test information structure to
write_schemata() instead of the test name. The new API is also more
flexible as it enables to use write_schemata() for more than one
resource within a test.

While touching the sprintf(), move the unnecessary %c that is always
'=' directly into the format string.

Signed-off-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/cat_test.c    | 11 +++++++----
 tools/testing/selftests/resctrl/cmt_test.c    |  6 ++++--
 tools/testing/selftests/resctrl/mba_test.c    |  9 +++++----
 tools/testing/selftests/resctrl/mbm_test.c    |  9 +++++----
 tools/testing/selftests/resctrl/resctrl.h     | 10 ++++++----
 tools/testing/selftests/resctrl/resctrl_val.c |  7 +++++--
 tools/testing/selftests/resctrl/resctrlfs.c   | 24 ++++++------------------
 7 files changed, 38 insertions(+), 38 deletions(-)

(limited to 'tools/testing/selftests/resctrl/cmt_test.c')

diff --git a/tools/testing/selftests/resctrl/cat_test.c b/tools/testing/selftests/resctrl/cat_test.c
index a9b4583620d0..24af8310288a 100644
--- a/tools/testing/selftests/resctrl/cat_test.c
+++ b/tools/testing/selftests/resctrl/cat_test.c
@@ -135,6 +135,7 @@ void cat_test_cleanup(void)
 
 /*
  * cat_test - Execute CAT benchmark and measure cache misses
+ * @test:		Test information structure
  * @uparams:		User supplied parameters
  * @param:		Parameters passed to cat_test()
  * @span:		Buffer size for the benchmark
@@ -152,7 +153,9 @@ void cat_test_cleanup(void)
  *
  * Return:		0 when the test was run, < 0 on error.
  */
-static int cat_test(const struct user_params *uparams, struct resctrl_val_param *param,
+static int cat_test(const struct resctrl_test *test,
+		    const struct user_params *uparams,
+		    struct resctrl_val_param *param,
 		    size_t span, unsigned long current_mask)
 {
 	char *resctrl_val = param->resctrl_val;
@@ -196,11 +199,11 @@ static int cat_test(const struct user_params *uparams, struct resctrl_val_param
 
 	while (current_mask) {
 		snprintf(schemata, sizeof(schemata), "%lx", param->mask & ~current_mask);
-		ret = write_schemata("", schemata, uparams->cpu, param->resctrl_val);
+		ret = write_schemata("", schemata, uparams->cpu, test->resource);
 		if (ret)
 			goto free_buf;
 		snprintf(schemata, sizeof(schemata), "%lx", current_mask);
-		ret = write_schemata(param->ctrlgrp, schemata, uparams->cpu, param->resctrl_val);
+		ret = write_schemata(param->ctrlgrp, schemata, uparams->cpu, test->resource);
 		if (ret)
 			goto free_buf;
 
@@ -279,7 +282,7 @@ static int cat_run_test(const struct resctrl_test *test, const struct user_param
 
 	remove(param.filename);
 
-	ret = cat_test(uparams, &param, span, start_mask);
+	ret = cat_test(test, uparams, &param, span, start_mask);
 	if (ret)
 		goto out;
 
diff --git a/tools/testing/selftests/resctrl/cmt_test.c b/tools/testing/selftests/resctrl/cmt_test.c
index c01980039118..dd5ca343c469 100644
--- a/tools/testing/selftests/resctrl/cmt_test.c
+++ b/tools/testing/selftests/resctrl/cmt_test.c
@@ -16,7 +16,9 @@
 #define MAX_DIFF		2000000
 #define MAX_DIFF_PERCENT	15
 
-static int cmt_setup(const struct user_params *uparams, struct resctrl_val_param *p)
+static int cmt_setup(const struct resctrl_test *test,
+		     const struct user_params *uparams,
+		     struct resctrl_val_param *p)
 {
 	/* Run NUM_OF_RUNS times */
 	if (p->num_of_runs >= NUM_OF_RUNS)
@@ -150,7 +152,7 @@ static int cmt_run_test(const struct resctrl_test *test, const struct user_param
 
 	remove(RESULT_FILE_NAME);
 
-	ret = resctrl_val(uparams, cmd, &param);
+	ret = resctrl_val(test, uparams, cmd, &param);
 	if (ret)
 		goto out;
 
diff --git a/tools/testing/selftests/resctrl/mba_test.c b/tools/testing/selftests/resctrl/mba_test.c
index c218af24f91d..da256d2dbe5c 100644
--- a/tools/testing/selftests/resctrl/mba_test.c
+++ b/tools/testing/selftests/resctrl/mba_test.c
@@ -22,7 +22,9 @@
  * con_mon grp, mon_grp in resctrl FS.
  * For each allocation, run 5 times in order to get average values.
  */
-static int mba_setup(const struct user_params *uparams, struct resctrl_val_param *p)
+static int mba_setup(const struct resctrl_test *test,
+		     const struct user_params *uparams,
+		     struct resctrl_val_param *p)
 {
 	static int runs_per_allocation, allocation = 100;
 	char allocation_str[64];
@@ -40,8 +42,7 @@ static int mba_setup(const struct user_params *uparams, struct resctrl_val_param
 
 	sprintf(allocation_str, "%d", allocation);
 
-	ret = write_schemata(p->ctrlgrp, allocation_str, uparams->cpu,
-			     p->resctrl_val);
+	ret = write_schemata(p->ctrlgrp, allocation_str, uparams->cpu, test->resource);
 	if (ret < 0)
 		return ret;
 
@@ -155,7 +156,7 @@ static int mba_run_test(const struct resctrl_test *test, const struct user_param
 
 	remove(RESULT_FILE_NAME);
 
-	ret = resctrl_val(uparams, uparams->benchmark_cmd, &param);
+	ret = resctrl_val(test, uparams, uparams->benchmark_cmd, &param);
 	if (ret)
 		goto out;
 
diff --git a/tools/testing/selftests/resctrl/mbm_test.c b/tools/testing/selftests/resctrl/mbm_test.c
index 919b10459c22..34879e7b71a0 100644
--- a/tools/testing/selftests/resctrl/mbm_test.c
+++ b/tools/testing/selftests/resctrl/mbm_test.c
@@ -86,7 +86,9 @@ static int check_results(size_t span)
 	return ret;
 }
 
-static int mbm_setup(const struct user_params *uparams, struct resctrl_val_param *p)
+static int mbm_setup(const struct resctrl_test *test,
+		     const struct user_params *uparams,
+		     struct resctrl_val_param *p)
 {
 	int ret = 0;
 
@@ -96,8 +98,7 @@ static int mbm_setup(const struct user_params *uparams, struct resctrl_val_param
 
 	/* Set up shemata with 100% allocation on the first run. */
 	if (p->num_of_runs == 0 && validate_resctrl_feature_request("MB", NULL))
-		ret = write_schemata(p->ctrlgrp, "100", uparams->cpu,
-				     p->resctrl_val);
+		ret = write_schemata(p->ctrlgrp, "100", uparams->cpu, test->resource);
 
 	p->num_of_runs++;
 
@@ -123,7 +124,7 @@ static int mbm_run_test(const struct resctrl_test *test, const struct user_param
 
 	remove(RESULT_FILE_NAME);
 
-	ret = resctrl_val(uparams, uparams->benchmark_cmd, &param);
+	ret = resctrl_val(test, uparams, uparams->benchmark_cmd, &param);
 	if (ret)
 		goto out;
 
diff --git a/tools/testing/selftests/resctrl/resctrl.h b/tools/testing/selftests/resctrl/resctrl.h
index 1168364b4cc2..97d16daf8190 100644
--- a/tools/testing/selftests/resctrl/resctrl.h
+++ b/tools/testing/selftests/resctrl/resctrl.h
@@ -98,7 +98,8 @@ struct resctrl_val_param {
 	char		*bw_report;
 	unsigned long	mask;
 	int		num_of_runs;
-	int		(*setup)(const struct user_params *uparams,
+	int		(*setup)(const struct resctrl_test *test,
+				 const struct user_params *uparams,
 				 struct resctrl_val_param *param);
 };
 
@@ -137,8 +138,7 @@ 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);
 int taskset_restore(pid_t bm_pid, cpu_set_t *old_affinity);
-int write_schemata(char *ctrlgrp, char *schemata, int cpu_no,
-		   char *resctrl_val);
+int write_schemata(char *ctrlgrp, char *schemata, int cpu_no, const char *resource);
 int write_bm_pid_to_resctrl(pid_t bm_pid, char *ctrlgrp, char *mongrp,
 			    char *resctrl_val);
 int perf_event_open(struct perf_event_attr *hw_event, pid_t pid, int cpu,
@@ -147,7 +147,9 @@ unsigned char *alloc_buffer(size_t buf_size, int memflush);
 void mem_flush(unsigned char *buf, size_t buf_size);
 void fill_cache_read(unsigned char *buf, size_t buf_size, bool once);
 int run_fill_buf(size_t buf_size, int memflush, int op, bool once);
-int resctrl_val(const struct user_params *uparams, const char * const *benchmark_cmd,
+int resctrl_val(const struct resctrl_test *test,
+		const struct user_params *uparams,
+		const char * const *benchmark_cmd,
 		struct resctrl_val_param *param);
 void tests_cleanup(void);
 void mbm_test_cleanup(void);
diff --git a/tools/testing/selftests/resctrl/resctrl_val.c b/tools/testing/selftests/resctrl/resctrl_val.c
index 6d0a35e8bd02..16ad91ccbcd3 100644
--- a/tools/testing/selftests/resctrl/resctrl_val.c
+++ b/tools/testing/selftests/resctrl/resctrl_val.c
@@ -684,13 +684,16 @@ static void run_benchmark(int signum, siginfo_t *info, void *ucontext)
 /*
  * resctrl_val:	execute benchmark and measure memory bandwidth on
  *			the benchmark
+ * @test:		test information structure
  * @uparams:		user supplied parameters
  * @benchmark_cmd:	benchmark command and its arguments
  * @param:		parameters passed to resctrl_val()
  *
  * Return:		0 when the test was run, < 0 on error.
  */
-int resctrl_val(const struct user_params *uparams, const char * const *benchmark_cmd,
+int resctrl_val(const struct resctrl_test *test,
+		const struct user_params *uparams,
+		const char * const *benchmark_cmd,
 		struct resctrl_val_param *param)
 {
 	char *resctrl_val = param->resctrl_val;
@@ -826,7 +829,7 @@ int resctrl_val(const struct user_params *uparams, const char * const *benchmark
 
 	/* Test runs until the callback setup() tells the test to stop. */
 	while (1) {
-		ret = param->setup(uparams, param);
+		ret = param->setup(test, uparams, param);
 		if (ret == END_OF_TESTS) {
 			ret = 0;
 			break;
diff --git a/tools/testing/selftests/resctrl/resctrlfs.c b/tools/testing/selftests/resctrl/resctrlfs.c
index 140f65467ddb..fed6741edc5f 100644
--- a/tools/testing/selftests/resctrl/resctrlfs.c
+++ b/tools/testing/selftests/resctrl/resctrlfs.c
@@ -529,23 +529,17 @@ out:
  * @ctrlgrp:		Name of the con_mon grp
  * @schemata:		Schemata that should be updated to
  * @cpu_no:		CPU number that the benchmark PID is binded to
- * @resctrl_val:	Resctrl feature (Eg: mbm, mba.. etc)
+ * @resource:		Resctrl resource (Eg: MB, L3, L2, etc.)
  *
- * Update schemata of a con_mon grp *only* if requested resctrl feature is
+ * Update schemata of a con_mon grp *only* if requested resctrl resource is
  * allocation type
  *
  * Return: 0 on success, < 0 on error.
  */
-int write_schemata(char *ctrlgrp, char *schemata, int cpu_no, char *resctrl_val)
+int write_schemata(char *ctrlgrp, char *schemata, int cpu_no, const char *resource)
 {
 	char controlgroup[1024], reason[128], schema[1024] = {};
-	int resource_id, fd, schema_len = -1, ret = 0;
-
-	if (strncmp(resctrl_val, MBA_STR, sizeof(MBA_STR)) &&
-	    strncmp(resctrl_val, MBM_STR, sizeof(MBM_STR)) &&
-	    strncmp(resctrl_val, CAT_STR, sizeof(CAT_STR)) &&
-	    strncmp(resctrl_val, CMT_STR, sizeof(CMT_STR)))
-		return -ENOENT;
+	int resource_id, fd, schema_len, ret = 0;
 
 	if (!schemata) {
 		ksft_print_msg("Skipping empty schemata update\n");
@@ -565,14 +559,8 @@ int write_schemata(char *ctrlgrp, char *schemata, int cpu_no, char *resctrl_val)
 	else
 		sprintf(controlgroup, "%s/schemata", RESCTRL_PATH);
 
-	if (!strncmp(resctrl_val, CAT_STR, sizeof(CAT_STR)) ||
-	    !strncmp(resctrl_val, CMT_STR, sizeof(CMT_STR)))
-		schema_len = snprintf(schema, sizeof(schema), "%s%d%c%s\n",
-				      "L3:", resource_id, '=', schemata);
-	if (!strncmp(resctrl_val, MBA_STR, sizeof(MBA_STR)) ||
-	    !strncmp(resctrl_val, MBM_STR, sizeof(MBM_STR)))
-		schema_len = snprintf(schema, sizeof(schema), "%s%d%c%s\n",
-				      "MB:", resource_id, '=', schemata);
+	schema_len = snprintf(schema, sizeof(schema), "%s:%d=%s\n",
+			      resource, resource_id, schemata);
 	if (schema_len < 0 || schema_len >= sizeof(schema)) {
 		snprintf(reason, sizeof(reason),
 			 "snprintf() failed with return value : %d", schema_len);
-- 
cgit v1.2.3


From 00616416488868a8b98343863e5ac078506e44e8 Mon Sep 17 00:00:00 2001
From: Maciej Wieczor-Retman <maciej.wieczor-retman@intel.com>
Date: Fri, 16 Feb 2024 09:35:28 +0100
Subject: selftests/resctrl: Split validate_resctrl_feature_request()
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

validate_resctrl_feature_request() is used to test both if a resource is
present in the info directory, and if a passed monitoring feature is
present in the mon_features file.

Refactor validate_resctrl_feature_request() into two smaller functions
that each accomplish one check to give feature checking more
granularity:
- Resource directory presence in the /sys/fs/resctrl/info directory.
- Feature name presence in the /sys/fs/resctrl/info/<RESOURCE>/mon_features
  file.

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/cmt_test.c  |  2 +-
 tools/testing/selftests/resctrl/mba_test.c  |  2 +-
 tools/testing/selftests/resctrl/mbm_test.c  |  6 ++---
 tools/testing/selftests/resctrl/resctrl.h   |  3 ++-
 tools/testing/selftests/resctrl/resctrlfs.c | 35 ++++++++++++++++++++---------
 5 files changed, 31 insertions(+), 17 deletions(-)

(limited to 'tools/testing/selftests/resctrl/cmt_test.c')

diff --git a/tools/testing/selftests/resctrl/cmt_test.c b/tools/testing/selftests/resctrl/cmt_test.c
index dd5ca343c469..a81f91222a89 100644
--- a/tools/testing/selftests/resctrl/cmt_test.c
+++ b/tools/testing/selftests/resctrl/cmt_test.c
@@ -170,7 +170,7 @@ out:
 static bool cmt_feature_check(const struct resctrl_test *test)
 {
 	return test_resource_feature_check(test) &&
-	       validate_resctrl_feature_request("L3_MON", "llc_occupancy");
+	       resctrl_mon_feature_exists("L3_MON", "llc_occupancy");
 }
 
 struct resctrl_test cmt_test = {
diff --git a/tools/testing/selftests/resctrl/mba_test.c b/tools/testing/selftests/resctrl/mba_test.c
index da256d2dbe5c..7946e32e85c8 100644
--- a/tools/testing/selftests/resctrl/mba_test.c
+++ b/tools/testing/selftests/resctrl/mba_test.c
@@ -171,7 +171,7 @@ out:
 static bool mba_feature_check(const struct resctrl_test *test)
 {
 	return test_resource_feature_check(test) &&
-	       validate_resctrl_feature_request("L3_MON", "mbm_local_bytes");
+	       resctrl_mon_feature_exists("L3_MON", "mbm_local_bytes");
 }
 
 struct resctrl_test mba_test = {
diff --git a/tools/testing/selftests/resctrl/mbm_test.c b/tools/testing/selftests/resctrl/mbm_test.c
index 34879e7b71a0..d67ffa3ec63a 100644
--- a/tools/testing/selftests/resctrl/mbm_test.c
+++ b/tools/testing/selftests/resctrl/mbm_test.c
@@ -97,7 +97,7 @@ static int mbm_setup(const struct resctrl_test *test,
 		return END_OF_TESTS;
 
 	/* Set up shemata with 100% allocation on the first run. */
-	if (p->num_of_runs == 0 && validate_resctrl_feature_request("MB", NULL))
+	if (p->num_of_runs == 0 && resctrl_resource_exists("MB"))
 		ret = write_schemata(p->ctrlgrp, "100", uparams->cpu, test->resource);
 
 	p->num_of_runs++;
@@ -140,8 +140,8 @@ out:
 
 static bool mbm_feature_check(const struct resctrl_test *test)
 {
-	return validate_resctrl_feature_request("L3_MON", "mbm_total_bytes") &&
-	       validate_resctrl_feature_request("L3_MON", "mbm_local_bytes");
+	return resctrl_mon_feature_exists("L3_MON", "mbm_total_bytes") &&
+	       resctrl_mon_feature_exists("L3_MON", "mbm_local_bytes");
 }
 
 struct resctrl_test mbm_test = {
diff --git a/tools/testing/selftests/resctrl/resctrl.h b/tools/testing/selftests/resctrl/resctrl.h
index 5116ea082d03..6d99ed44ec60 100644
--- a/tools/testing/selftests/resctrl/resctrl.h
+++ b/tools/testing/selftests/resctrl/resctrl.h
@@ -136,7 +136,8 @@ int get_domain_id(const char *resource, int cpu_no, int *domain_id);
 int mount_resctrlfs(void);
 int umount_resctrlfs(void);
 int validate_bw_report_request(char *bw_report);
-bool validate_resctrl_feature_request(const char *resource, const char *feature);
+bool resctrl_resource_exists(const char *resource);
+bool resctrl_mon_feature_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);
diff --git a/tools/testing/selftests/resctrl/resctrlfs.c b/tools/testing/selftests/resctrl/resctrlfs.c
index 8a183c73bc23..1273e55c4a9d 100644
--- a/tools/testing/selftests/resctrl/resctrlfs.c
+++ b/tools/testing/selftests/resctrl/resctrlfs.c
@@ -708,20 +708,16 @@ char *fgrep(FILE *inf, const char *str)
 }
 
 /*
- * validate_resctrl_feature_request - Check if requested feature is valid.
- * @resource:	Required resource (e.g., MB, L3, L2, L3_MON, etc.)
- * @feature:	Required monitor feature (in mon_features file). Can only be
- *		set for L3_MON. Must be NULL for all other resources.
+ * resctrl_resource_exists - Check if a resource is supported.
+ * @resource:	Resctrl resource (e.g., MB, L3, L2, L3_MON, etc.)
  *
- * Return: True if the resource/feature is supported, else false. False is
+ * Return: True if the resource is supported, else false. False is
  *         also returned if resctrl FS is not mounted.
  */
-bool validate_resctrl_feature_request(const char *resource, const char *feature)
+bool resctrl_resource_exists(const char *resource)
 {
 	char res_path[PATH_MAX];
 	struct stat statbuf;
-	char *res;
-	FILE *inf;
 	int ret;
 
 	if (!resource)
@@ -736,8 +732,25 @@ bool validate_resctrl_feature_request(const char *resource, const char *feature)
 	if (stat(res_path, &statbuf))
 		return false;
 
-	if (!feature)
-		return true;
+	return true;
+}
+
+/*
+ * resctrl_mon_feature_exists - Check if requested monitoring feature is valid.
+ * @resource:	Resource that uses the mon_features file. Currently only L3_MON
+ *		is valid.
+ * @feature:	Required monitor feature (in mon_features file).
+ *
+ * Return: True if the feature is supported, else false.
+ */
+bool resctrl_mon_feature_exists(const char *resource, const char *feature)
+{
+	char res_path[PATH_MAX];
+	char *res;
+	FILE *inf;
+
+	if (!feature || !resource)
+		return false;
 
 	snprintf(res_path, sizeof(res_path), "%s/%s/mon_features", INFO_PATH, resource);
 	inf = fopen(res_path, "r");
@@ -753,7 +766,7 @@ bool validate_resctrl_feature_request(const char *resource, const char *feature)
 
 bool test_resource_feature_check(const struct resctrl_test *test)
 {
-	return validate_resctrl_feature_request(test->resource, NULL);
+	return resctrl_resource_exists(test->resource);
 }
 
 int filter_dmesg(void)
-- 
cgit v1.2.3