Function power_cppc_cpufreq_exit

dpdk/lib/power/power_cppc_cpufreq.c:420–469

}

int
power_cppc_cpufreq_exit(unsigned int lcore_id)
{
	struct cppc_power_info *pi;
	uint32_t exp_state;

	if (lcore_id >= RTE_MAX_LCORE) {
		RTE_LOG(ERR, POWER, "Lcore id %u can not exceeds %u\n",
				lcore_id, RTE_MAX_LCORE - 1U);
		return -1;
	}
	pi = &lcore_power_info[lcore_id];
	exp_state = POWER_USED;
	/* The power in use state works as a guard variable between
	 * the CPU frequency control initialization and exit process.
	 * The ACQUIRE memory ordering here pairs with the RELEASE
	 * ordering below as lock to make sure the frequency operations
	 * in the critical section are done under the correct state.
	 */
	if (!rte_atomic_compare_exchange_strong_explicit(&(pi->state), &exp_state,
					POWER_ONGOING,
					rte_memory_order_acquire, rte_memory_order_relaxed)) {
		RTE_LOG(INFO, POWER, "Power management of lcore %u is "
				"not used\n", lcore_id);
		return -1;
	}

	/* Close FD of setting freq */
	fclose(pi->f);
	pi->f = NULL;

	/* Set the governor back to the original */
	if (power_set_governor_original(pi) < 0) {
		RTE_LOG(ERR, POWER, "Cannot set the governor of %u back "
				"to the original\n", lcore_id);
		goto fail;
	}

	RTE_LOG(INFO, POWER, "Power management of lcore %u has exited from "
			"'userspace' mode and been set back to the "
			"original\n", lcore_id);
	rte_atomic_store_explicit(&(pi->state), POWER_IDLE, rte_memory_order_release);

	return 0;

fail:
	rte_atomic_store_explicit(&(pi->state), POWER_UNKNOWN, rte_memory_order_release);

	return -1;
}

uint32_t
power_cppc_cpufreq_freqs(unsigned int lcore_id, uint32_t *freqs, uint32_t num)