The CAT non-contiguous selftests have to read the file responsible for
reporting support of non-contiguous CBMs in Intel CAT. Then the test
compares if that information matches what is reported by CPUID output.
Add a generic helper function to read a chosen functionality support
information.
Signed-off-by: Maciej Wieczor-Retman <maciej.wieczor-retman@xxxxxxxxx>
---
Changelog v2:
- Added this patch.
tools/testing/selftests/resctrl/resctrl.h | 1 +
tools/testing/selftests/resctrl/resctrlfs.c | 25 +++++++++++++++++++++
2 files changed, 26 insertions(+)
diff --git a/tools/testing/selftests/resctrl/resctrl.h b/tools/testing/selftests/resctrl/resctrl.h
index 739e16d08a7b..8f72d94b9cbe 100644
--- a/tools/testing/selftests/resctrl/resctrl.h
+++ b/tools/testing/selftests/resctrl/resctrl.h
@@ -161,6 +161,7 @@ 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 read_info_res_file(const char *resource, const char *filename);
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 0e97036a64b8..70333440ff2f 100644
--- a/tools/testing/selftests/resctrl/resctrlfs.c
+++ b/tools/testing/selftests/resctrl/resctrlfs.c
@@ -249,6 +249,31 @@ static int get_bit_mask(const char *filename, unsigned long *mask)
return 0;
}
+int read_info_res_file(const char *resource, const char *filename)
+{
+ char file_path[PATH_MAX];
+ FILE *fp;
+ int ret;
+
+ snprintf(file_path, sizeof(file_path), "%s/%s/%s", INFO_PATH, resource,
+ filename);
+
+ fp = fopen(file_path, "r");
+ if (!fp) {
+ perror("Error in opening sparse_masks file\n");
+ return -1;
+ }
+
+ if (fscanf(fp, "%u", &ret) <= 0) {
+ perror("Could not get sparse_masks contents\n");
+ fclose(fp);
+ return -1;
+ }
+
+ fclose(fp);
+ return ret;
+}
+
/*
* create_bit_mask- Create bit mask from start, len pair
* @start: LSB of the mask
--
2.43.0
