tools/testing/selftests/thermal/intel/workload_hint/workload_hint_test.c

Source file repositories/reference/linux-study-clean/tools/testing/selftests/thermal/intel/workload_hint/workload_hint_test.c

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/thermal/intel/workload_hint/workload_hint_test.c
Extension
.c
Size
3998 bytes
Lines
188
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: implementation source
Status
source implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

if (!strcmp(argv[i], "slow")) {
				wlt_slow = 1;
				continue;
			}

			ret = sscanf(argv[1], "%d", &delay);
			if (ret < 0) {
				printf("Invalid delay\n");
				exit(1);
			}

			sprintf(delay_str, "%s\n", argv[1]);
			update_delay(delay_str);
		}
	}

	if (signal(SIGINT, workload_hint_exit) == SIG_IGN)
		signal(SIGINT, SIG_IGN);
	if (signal(SIGHUP, workload_hint_exit) == SIG_IGN)
		signal(SIGHUP, SIG_IGN);
	if (signal(SIGTERM, workload_hint_exit) == SIG_IGN)
		signal(SIGTERM, SIG_IGN);

	if (wlt_slow)
		wlt_enable_attr = WORKLOAD_SLOW_ENABLE_ATTRIBUTE;
	else
		wlt_enable_attr = WORKLOAD_ENABLE_ATTRIBUTE;

	/* Enable feature via sysfs knob */
	fd = open(wlt_enable_attr, O_RDWR);
	if (fd < 0) {
		perror("Unable to open workload type feature enable file");
		exit(1);
	}

	if (write(fd, "1\n", 2) < 0) {
		perror("Can't enable workload hints");
		exit(1);
	}

	close(fd);

	printf("Enabled workload type prediction\n");

	while (1) {
		fd = open(WORKLOAD_TYPE_INDEX_ATTRIBUTE, O_RDONLY);
		if (fd < 0) {
			perror("Unable to open workload type file");
			exit(1);
		}

		if ((lseek(fd, 0L, SEEK_SET)) < 0) {
			fprintf(stderr, "Failed to set pointer to beginning\n");
			exit(1);
		}

		if (read(fd, index_str, sizeof(index_str)) < 0) {
			fprintf(stderr, "Failed to read from:%s\n",
			WORKLOAD_TYPE_INDEX_ATTRIBUTE);
			exit(1);
		}

		ufd.fd = fd;
		ufd.events = POLLPRI;

		ret = poll(&ufd, 1, -1);
		if (ret < 0) {
			perror("poll error");
			exit(1);
		} else if (ret == 0) {
			printf("Poll Timeout\n");
		} else {
			if ((lseek(fd, 0L, SEEK_SET)) < 0) {
				fprintf(stderr, "Failed to set pointer to beginning\n");
				exit(1);
			}

			if (read(fd, index_str, sizeof(index_str)) < 0)
				exit(0);

			ret = sscanf(index_str, "%d", &index);
			if (ret < 0)
				break;

			if (wlt_slow) {
				if (index & 0x10)
					printf("workload type slow:%s\n", "power");
				else
					printf("workload type slow:%s\n", "performance");
			}

Annotation

Implementation Notes