Function power_cppc_cpufreq_init

dpdk/lib/power/power_cppc_cpufreq.c:337–408

}

int
power_cppc_cpufreq_init(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_IDLE;
	/* 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 "
				"in use\n", lcore_id);
		return -1;
	}

	if (power_get_lcore_mapped_cpu_id(lcore_id, &pi->lcore_id) < 0) {
		RTE_LOG(ERR, POWER, "Cannot get CPU ID mapped for lcore %u\n", lcore_id);
		return -1;
	}

	/* Check and set the governor */
	if (power_set_governor_userspace(pi) < 0) {
		RTE_LOG(ERR, POWER, "Cannot set governor of lcore %u to "
				"userspace\n", lcore_id);
		goto fail;
	}

	/* Get the available frequencies */
	if (power_get_available_freqs(pi) < 0) {
		RTE_LOG(ERR, POWER, "Cannot get available frequencies of "
				"lcore %u\n", lcore_id);
		goto fail;
	}

	/* Init for setting lcore frequency */
	if (power_init_for_setting_freq(pi) < 0) {
		RTE_LOG(ERR, POWER, "Cannot init for setting frequency for "
				"lcore %u\n", lcore_id);
		goto fail;
	}

	/* Set freq to max by default */
	if (power_cppc_cpufreq_freq_max(lcore_id) < 0) {
		RTE_LOG(ERR, POWER, "Cannot set frequency of lcore %u "
				"to max\n", lcore_id);