The CAT non-contiguous selftests have to read the file responsible for reporting support of non-contiguous CBMs in kernel (resctrl). Then the test compares if that information matches what is reported by CPUID output.
Add a generic helper function to read an unsigned number from /sys/fs/resctrl/info/<RESOURCE>/<FILE>.
Signed-off-by: Maciej Wieczor-Retman maciej.wieczor-retman@intel.com Reviewed-by: Ilpo Järvinen ilpo.jarvinen@linux.intel.com --- Changelog v5: - Remove '\n' from ksft_print_msg() calls. (Ilpo) - Add Ilpo's reviewed-by tag. - Change 'helpers' -> 'a helper' in the subject. - Change 'a file in' -> '' in patch message. - Remove '*' from resource_info_file_exists()'s comment. - 'saved into the @val' -> 'saved into @val' - 'Error in opening' -> 'Error opening' - Redo path in function comment.
Changelog v4: - Rewrite function comment. - Redo ksft_perror() as ksft_print_msg(). (Reinette)
Changelog v3: - Rewrite patch message. - Add documentation and rewrote the function. (Reinette)
Changelog v2: - Add this patch.
tools/testing/selftests/resctrl/resctrl.h | 1 + tools/testing/selftests/resctrl/resctrlfs.c | 36 +++++++++++++++++++++ 2 files changed, 37 insertions(+)
diff --git a/tools/testing/selftests/resctrl/resctrl.h b/tools/testing/selftests/resctrl/resctrl.h index a1462029998e..5116ea082d03 100644 --- a/tools/testing/selftests/resctrl/resctrl.h +++ b/tools/testing/selftests/resctrl/resctrl.h @@ -162,6 +162,7 @@ unsigned int count_contiguous_bits(unsigned long val, unsigned int *start); int get_full_cbm(const char *cache_type, unsigned long *mask); int get_mask_no_shareable(const char *cache_type, unsigned long *mask); int get_cache_size(int cpu_no, const char *cache_type, unsigned long *cache_size); +int resource_info_unsigned_get(const char *resource, const char *filename, unsigned int *val); void ctrlc_handler(int signum, siginfo_t *info, void *ptr); int signal_handler_register(void); void signal_handler_unregister(void); diff --git a/tools/testing/selftests/resctrl/resctrlfs.c b/tools/testing/selftests/resctrl/resctrlfs.c index 5750662cce57..8a183c73bc23 100644 --- a/tools/testing/selftests/resctrl/resctrlfs.c +++ b/tools/testing/selftests/resctrl/resctrlfs.c @@ -249,6 +249,42 @@ static int get_bit_mask(const char *filename, unsigned long *mask) return 0; }
+/* + * resource_info_unsigned_get - Read an unsigned value from + * /sys/fs/resctrl/info/@resource/@filename + * @resource: Resource name that matches directory name in + * /sys/fs/resctrl/info + * @filename: File in /sys/fs/resctrl/info/@resource + * @val: Contains read value on success. + * + * Return: = 0 on success, < 0 on failure. On success the read + * value is saved into @val. + */ +int resource_info_unsigned_get(const char *resource, const char *filename, + unsigned int *val) +{ + char file_path[PATH_MAX]; + FILE *fp; + + snprintf(file_path, sizeof(file_path), "%s/%s/%s", INFO_PATH, resource, + filename); + + fp = fopen(file_path, "r"); + if (!fp) { + ksft_print_msg("Error opening %s: %m\n", file_path); + return -1; + } + + if (fscanf(fp, "%u", val) <= 0) { + ksft_print_msg("Could not get contents of %s: %m\n", file_path); + fclose(fp); + return -1; + } + + fclose(fp); + return 0; +} + /* * create_bit_mask- Create bit mask from start, len pair * @start: LSB of the mask