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Date: Tue, 12 Dec 2023 15:52:53 +0100
From: Maciej Wieczor-Retman <maciej.wieczor-retman@...el.com>
To: Fenghua Yu <fenghua.yu@...el.com>,
Reinette Chatre <reinette.chatre@...el.com>,
Shuah Khan <shuah@...nel.org>
Cc: ilpo.jarvinen@...ux.intel.com, linux-kernel@...r.kernel.org,
linux-kselftest@...r.kernel.org
Subject: [PATCH v2 3/4] selftests/resctrl: Split validate_resctrl_feature_request()
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. There exists a different way to
represent feature support and that is by the presence of 0 or 1 in
single file in the info/resource directory. In this case the filename
represents what feature support is being indicated.
Split validate_resctrl_feature_request() into three smaller functions
that each accomplish one check:
- Resource directory presence in the /sys/fs/resctrl/info directory.
- Feature name presence in the /sys/fs/resctrl/info/RESOURCE/mon_features file.
- Feature file presence in a given /sys/fs/resctrl/info/RESOURCE directory.
Signed-off-by: Maciej Wieczor-Retman <maciej.wieczor-retman@...el.com>
---
Changelog v2:
- Added this patch.
tools/testing/selftests/resctrl/cat_test.c | 2 -
tools/testing/selftests/resctrl/cmt_test.c | 4 +-
tools/testing/selftests/resctrl/mba_test.c | 5 +-
tools/testing/selftests/resctrl/mbm_test.c | 6 +--
tools/testing/selftests/resctrl/resctrl.h | 6 ++-
tools/testing/selftests/resctrl/resctrlfs.c | 59 +++++++++++++++++----
6 files changed, 63 insertions(+), 19 deletions(-)
diff --git a/tools/testing/selftests/resctrl/cat_test.c b/tools/testing/selftests/resctrl/cat_test.c
index 39fc9303b8e8..7dc7206b3b99 100644
--- a/tools/testing/selftests/resctrl/cat_test.c
+++ b/tools/testing/selftests/resctrl/cat_test.c
@@ -1,9 +1,7 @@
// SPDX-License-Identifier: GPL-2.0
/*
* Cache Allocation Technology (CAT) test
- *
* Copyright (C) 2018 Intel Corporation
- *
* Authors:
* Sai Praneeth Prakhya <sai.praneeth.prakhya@...el.com>,
* Fenghua Yu <fenghua.yu@...el.com>
diff --git a/tools/testing/selftests/resctrl/cmt_test.c b/tools/testing/selftests/resctrl/cmt_test.c
index dd5ca343c469..7b63aec8e2c4 100644
--- a/tools/testing/selftests/resctrl/cmt_test.c
+++ b/tools/testing/selftests/resctrl/cmt_test.c
@@ -169,8 +169,8 @@ static int cmt_run_test(const struct resctrl_test *test, const struct user_param
static bool cmt_feature_check(const struct resctrl_test *test)
{
- return test_resource_feature_check(test) &&
- validate_resctrl_feature_request("L3_MON", "llc_occupancy");
+ return resctrl_mon_feature_exists("L3_MON", "llc_occupancy") &&
+ resctrl_resource_exists("L3");
}
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..ecf1c186448d 100644
--- a/tools/testing/selftests/resctrl/mba_test.c
+++ b/tools/testing/selftests/resctrl/mba_test.c
@@ -170,8 +170,9 @@ static int mba_run_test(const struct resctrl_test *test, const struct user_param
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");
+ return resctrl_resource_exists(test->resource) &&
+ 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 @@ static int mbm_run_test(const struct resctrl_test *test, const struct user_param
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 8f72d94b9cbe..74041a35d4ba 100644
--- a/tools/testing/selftests/resctrl/resctrl.h
+++ b/tools/testing/selftests/resctrl/resctrl.h
@@ -135,7 +135,11 @@ 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 resctrl_cache_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 70333440ff2f..8546421f0940 100644
--- a/tools/testing/selftests/resctrl/resctrlfs.c
+++ b/tools/testing/selftests/resctrl/resctrlfs.c
@@ -697,20 +697,16 @@ 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)
@@ -725,6 +721,25 @@ bool validate_resctrl_feature_request(const char *resource, const char *feature)
if (stat(res_path, &statbuf))
return false;
+ return true;
+}
+
+/*
+ * resctrl_mon_feature_exists - 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.
+ *
+ * Return: True if the resource/feature is supported, else false. False is
+ * also returned if resctrl FS is not mounted.
+ */
+bool resctrl_mon_feature_exists(const char *resource,
+ const char *feature)
+{
+ char res_path[PATH_MAX];
+ char *res;
+ FILE *inf;
+
if (!feature)
return true;
@@ -740,9 +755,35 @@ bool validate_resctrl_feature_request(const char *resource, const char *feature)
return !!res;
}
+/*
+ * resctrl_cache_feature_exists - Check if a file that indicates a
+ * cache related feature support is present.
+ * @resource: Required cache resource (L3 or L2)
+ * @feature: Required cache feature.
+ *
+ * Return: True if the feature is supported, else false.
+ */
+bool resctrl_cache_feature_exists(const char *resource,
+ const char *feature)
+{
+ char res_path[PATH_MAX];
+ struct stat statbuf;
+
+ if (!feature)
+ return true;
+
+ snprintf(res_path, sizeof(res_path), "%s/%s/%s", INFO_PATH, resource,
+ feature);
+
+ if (stat(res_path, &statbuf))
+ return false;
+
+ return true;
+}
+
bool test_resource_feature_check(const struct resctrl_test *test)
{
- return validate_resctrl_feature_request(test->resource, NULL);
+ return resctrl_resource_exists(test->resource);
}
int filter_dmesg(void)
--
2.43.0
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