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Commit acddfa88 authored by Praveen Chidambaram's avatar Praveen Chidambaram
Browse files

msm: lpm-levels: Apply QoS requests only to relevant cpus. 



Use the PM QoS cpu/cupmask variant to provide a mimimum CPU_DMA_LATENCY
for the requesting kernel modules. Kernel modules may specify individual
cpus/cpumask but mostly can set the IRQ affinity for QoS. The PM QoS
framework distils the requirement and can provide the latency
requirement for each cpu or a collection of cpus.

Change-Id: I5f5465653496427d3d40a25ec46570d3c183239e
Signed-off-by: default avatarPraveen Chidambaram <pchidamb@codeaurora.org>
parent 54757847

drivers/cpuidle/lpm-levels.c

+9 −2
Original line number Diff line number Diff line
@@ -233,7 +233,8 @@ static int cpu_power_select(struct cpuidle_device *dev, 
{

	int best_level = -1;

	uint32_t best_level_pwr = ~0U;

	uint32_t latency_us = pm_qos_request(PM_QOS_CPU_DMA_LATENCY);

	uint32_t latency_us = pm_qos_request_for_cpu(PM_QOS_CPU_DMA_LATENCY,

							dev->cpu);

	uint32_t sleep_us =

		(uint32_t)(ktime_to_us(tick_nohz_get_sleep_length()));

	uint32_t modified_time_us = 0;
@@ -378,13 +379,19 @@ static int cluster_select(struct lpm_cluster *cluster, bool from_idle) 
	int i;

	uint32_t best_level_pwr = ~0U;

	uint32_t pwr;

	uint32_t latency_us = pm_qos_request(PM_QOS_CPU_DMA_LATENCY);

	struct cpumask mask;

	uint32_t latency_us = ~0U;

	uint32_t sleep_us;



	if (!cluster)

		return -EINVAL;



	sleep_us = (uint32_t)get_cluster_sleep_time(cluster, NULL, from_idle);

	if (cpumask_and(&mask, cpu_online_mask, &cluster->child_cpus))

		latency_us = pm_qos_request_for_cpumask(PM_QOS_CPU_DMA_LATENCY,

							&mask);

	else

		BUG_ON(!from_idle);



	for (i = 0; i < cluster->nlevels; i++) {

		struct lpm_cluster_level *level = &cluster->levels[i];