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drivers: lpm-levels: use correct CPUHP notifications for QoS

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Adding and removing dev PM QoS notifications uses mutex lock and
therefore cannot be called from CPU starting notifications. Update QoS
notifier in a stage when interrupts are allowed.

Change-Id: I21ce6a23d51e97d9f05e96a1772c028c4760ec7d
Signed-off-by: Lina Iyer <ilina@codeaurora.org>
This commit is contained in:
Lina Iyer 2020-04-26 11:28:22 -06:00
commit 38a8e511af
2 changed files with 27 additions and 6 deletions
Download patch file Download diff file Expand all files Collapse all files

30
drivers/cpuidle/lpm-levels.c
View file

@ -144,6 +144,24 @@ static int lpm_cpu_qos_notify(struct notifier_block *nb,
return NOTIFY_OK;
}
static int lpm_offline_cpu(unsigned int cpu)
{
struct device *dev = get_cpu_device(cpu);
dev_pm_qos_remove_notifier(dev, &dev_pm_qos_nb[cpu],
DEV_PM_QOS_RESUME_LATENCY);
return 0;
}
static int lpm_online_cpu(unsigned int cpu)
{
struct device *dev = get_cpu_device(cpu);
dev_pm_qos_add_notifier(dev, &dev_pm_qos_nb[cpu],
DEV_PM_QOS_RESUME_LATENCY);
return 0;
}
/**
* msm_cpuidle_get_deep_idle_latency - Get deep idle latency value
*
@ -194,10 +212,7 @@ static void update_debug_pc_event(enum debug_event event, uint32_t arg1,
static int lpm_dying_cpu(unsigned int cpu)
{
struct lpm_cluster *cluster = per_cpu(cpu_lpm, cpu)->parent;
struct device *dev = get_cpu_device(cpu);
dev_pm_qos_remove_notifier(dev, &dev_pm_qos_nb[cpu],
DEV_PM_QOS_RESUME_LATENCY);
update_debug_pc_event(CPU_HP_DYING, cpu,
cluster->num_children_in_sync.bits[0],
cluster->child_cpus.bits[0], false);
@ -208,10 +223,7 @@ static int lpm_dying_cpu(unsigned int cpu)
static int lpm_starting_cpu(unsigned int cpu)
{
struct lpm_cluster *cluster = per_cpu(cpu_lpm, cpu)->parent;
struct device *dev = get_cpu_device(cpu);
dev_pm_qos_add_notifier(dev, &dev_pm_qos_nb[cpu],
DEV_PM_QOS_RESUME_LATENCY);
update_debug_pc_event(CPU_HP_STARTING, cpu,
cluster->num_children_in_sync.bits[0],
cluster->child_cpus.bits[0], false);
@ -1588,6 +1600,12 @@ static int lpm_probe(struct platform_device *pdev)
if (ret)
goto failed;
ret = cpuhp_setup_state(CPUHP_AP_QCOM_CPU_QOS_ONLINE,
"AP_QCOM_CPU_QOS_ONLINE",
lpm_online_cpu, lpm_offline_cpu);
if (ret)
goto failed;
module_kobj = kset_find_obj(module_kset, KBUILD_MODNAME);
if (!module_kobj) {
pr_err("Cannot find kobject for module %s\n", KBUILD_MODNAME);

3
include/linux/cpuhotplug.h
View file

@ -184,6 +184,9 @@ enum cpuhp_state {
CPUHP_AP_PERF_ARM_L2X0_ONLINE,
CPUHP_AP_PERF_ARM_QCOM_L2_ONLINE,
CPUHP_AP_PERF_ARM_QCOM_L3_ONLINE,
#ifdef CONFIG_ARM_QCOM_LPM_CPUIDLE
CPUHP_AP_QCOM_CPU_QOS_ONLINE,
#endif
CPUHP_AP_PERF_ARM_APM_XGENE_ONLINE,
CPUHP_AP_PERF_ARM_CAVIUM_TX2_UNCORE_ONLINE,
CPUHP_AP_PERF_POWERPC_NEST_IMC_ONLINE,