Commit e331ac14 authored by Maciej Wieczor-Retman's avatar Maciej Wieczor-Retman Committed by Shuah Khan
Browse files

selftests/resctrl: Add a helper for the non-contiguous test 



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: default avatarMaciej Wieczor-Retman <maciej.wieczor-retman@intel.com>
Reviewed-by: default avatarIlpo Järvinen <ilpo.jarvinen@linux.intel.com>
Reviewed-by: default avatarReinette Chatre <reinette.chatre@intel.com>
Signed-off-by: default avatarShuah Khan <skhan@linuxfoundation.org>
parent 5339792b

tools/testing/selftests/resctrl/resctrl.h

+1 −0
Original line number Diff line number Diff line
@@ -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);

tools/testing/selftests/resctrl/resctrlfs.c

+36 −0
Original line number Diff line number Diff line
@@ -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