tools/power/cpupower/utils/cpuidle-set.c

Source file repositories/reference/linux-study-clean/tools/power/cpupower/utils/cpuidle-set.c

File Facts

System
Linux kernel
Corpus path
tools/power/cpupower/utils/cpuidle-set.c
Extension
.c
Size
4254 bytes
Lines
186
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

switch (ret) {
		case '?':
			param = '?';
			cont = 0;
			break;
		case 'd':
		case 'e':
			if (param) {
				param = -1;
				cont = 0;
				break;
			}
			param = ret;
			strtol(optarg, &endptr, 10);
			if (*endptr != '\0') {
				printf(_("Bad value: %s, Integer expected\n"), optarg);
				exit(EXIT_FAILURE);
			} else {
				idlestate = atoi(optarg);
			}
			break;
		case 'D':
			if (param) {
				param = -1;
				cont = 0;
				break;
			}
			param = ret;
			latency = strtoull(optarg, &endptr, 10);
			if (*endptr != '\0') {
				printf(_("Bad latency value: %s\n"), optarg);
				exit(EXIT_FAILURE);
			}
			break;
		case 'E':
			if (param) {
				param = -1;
				cont = 0;
				break;
			}
			param = ret;
			break;
		case -1:
			cont = 0;
			break;
		}
	} while (cont);

	switch (param) {
	case -1:
		printf(_("You can't specify more than one "
			 "output-specific argument\n"));
		exit(EXIT_FAILURE);
	case '?':
		printf(_("invalid or unknown argument\n"));
		exit(EXIT_FAILURE);
	}

	get_cpustate();

	/* Default is: set all CPUs */
	if (bitmask_isallclear(cpus_chosen))
		bitmask_setall(cpus_chosen);

	for (cpu = bitmask_first(cpus_chosen);
	     cpu <= bitmask_last(cpus_chosen); cpu++) {

		if (!bitmask_isbitset(cpus_chosen, cpu))
			continue;

		if (cpupower_is_cpu_online(cpu) != 1)
			continue;

		idlestates = cpuidle_state_count(cpu);
		if (idlestates <= 0)
			continue;

		switch (param) {
		case 'd':
			ret = cpuidle_state_disable(cpu, idlestate, 1);
			if (ret == 0)
		printf(_("Idlestate %u disabled on CPU %u\n"),  idlestate, cpu);
			else if (ret == -1)
		printf(_("Idlestate %u not available on CPU %u\n"),
		       idlestate, cpu);
			else if (ret == -2)
		printf(_("Idlestate disabling not supported by kernel\n"));
			else
		printf(_("Idlestate %u not disabled on CPU %u\n"),
		       idlestate, cpu);

Annotation

Implementation Notes