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iommu/exynos: Add runtime pm support 

This patch adds runtime pm implementation, which is based on previous
suspend/resume code. SYSMMU controller is now being enabled/disabled mainly
from the runtime pm callbacks. System sleep callbacks relies on generic
pm_runtime_force_suspend/pm_runtime_force_resume helpers. To ensure
internal state consistency, additional lock for runtime pm transitions
was introduced.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Marek Szyprowski 2016-11-14 11:08:11 +01:00 committed by Joerg Roedel
parent e11723000f
commit 9b265536c2
1 changed files with 36 additions and 9 deletions
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45
drivers/iommu/exynos-iommu.c
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@ -237,6 +237,7 @@ static const struct sysmmu_fault_info sysmmu_v5_faults[] = {
struct exynos_iommu_owner {
struct list_head controllers; /* list of sysmmu_drvdata.owner_node */
struct iommu_domain *domain; /* domain this device is attached */
struct mutex rpm_lock; /* for runtime pm of all sysmmus */
};
/*
@ -632,40 +633,46 @@ static int __init exynos_sysmmu_probe(struct platform_device *pdev)
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int exynos_sysmmu_suspend(struct device *dev)
static int __maybe_unused exynos_sysmmu_suspend(struct device *dev)
{
struct sysmmu_drvdata *data = dev_get_drvdata(dev);
struct device *master = data->master;
if (master) {
pm_runtime_put(dev);
struct exynos_iommu_owner *owner = master->archdata.iommu;
mutex_lock(&owner->rpm_lock);
if (data->domain) {
dev_dbg(data->sysmmu, "saving state\n");
__sysmmu_disable(data);
}
mutex_unlock(&owner->rpm_lock);
}
return 0;
}
static int exynos_sysmmu_resume(struct device *dev)
static int __maybe_unused exynos_sysmmu_resume(struct device *dev)
{
struct sysmmu_drvdata *data = dev_get_drvdata(dev);
struct device *master = data->master;
if (master) {
pm_runtime_get_sync(dev);
struct exynos_iommu_owner *owner = master->archdata.iommu;
mutex_lock(&owner->rpm_lock);
if (data->domain) {
dev_dbg(data->sysmmu, "restoring state\n");
__sysmmu_enable(data);
}
mutex_unlock(&owner->rpm_lock);
}
return 0;
}
#endif
static const struct dev_pm_ops sysmmu_pm_ops = {
SET_LATE_SYSTEM_SLEEP_PM_OPS(exynos_sysmmu_suspend, exynos_sysmmu_resume)
SET_RUNTIME_PM_OPS(exynos_sysmmu_suspend, exynos_sysmmu_resume, NULL)
SET_LATE_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
pm_runtime_force_resume)
};
static const struct of_device_id sysmmu_of_match[] __initconst = {
@ -813,7 +820,15 @@ static void exynos_iommu_detach_device(struct iommu_domain *iommu_domain,
return;
list_for_each_entry(data, &owner->controllers, owner_node) {
__sysmmu_disable(data);
pm_runtime_put_sync(data->sysmmu);
}
mutex_lock(&owner->rpm_lock);
list_for_each_entry(data, &owner->controllers, owner_node) {
pm_runtime_get_noresume(data->sysmmu);
if (pm_runtime_active(data->sysmmu))
__sysmmu_disable(data);
pm_runtime_put(data->sysmmu);
}
@ -828,6 +843,7 @@ static void exynos_iommu_detach_device(struct iommu_domain *iommu_domain,
owner->domain = NULL;
spin_unlock_irqrestore(&domain->lock, flags);
mutex_unlock(&owner->rpm_lock);
dev_dbg(dev, "%s: Detached IOMMU with pgtable %pa\n", __func__,
&pagetable);
@ -848,6 +864,8 @@ static int exynos_iommu_attach_device(struct iommu_domain *iommu_domain,
if (owner->domain)
exynos_iommu_detach_device(owner->domain, dev);
mutex_lock(&owner->rpm_lock);
spin_lock_irqsave(&domain->lock, flags);
list_for_each_entry(data, &owner->controllers, owner_node) {
spin_lock(&data->lock);
@ -859,9 +877,17 @@ static int exynos_iommu_attach_device(struct iommu_domain *iommu_domain,
owner->domain = iommu_domain;
spin_unlock_irqrestore(&domain->lock, flags);
list_for_each_entry(data, &owner->controllers, owner_node) {
pm_runtime_get_noresume(data->sysmmu);
if (pm_runtime_active(data->sysmmu))
__sysmmu_enable(data);
pm_runtime_put(data->sysmmu);
}
mutex_unlock(&owner->rpm_lock);
list_for_each_entry(data, &owner->controllers, owner_node) {
pm_runtime_get_sync(data->sysmmu);
__sysmmu_enable(data);
}
dev_dbg(dev, "%s: Attached IOMMU with pgtable %pa\n", __func__,
@ -1239,6 +1265,7 @@ static int exynos_iommu_of_xlate(struct device *dev,
return -ENOMEM;
INIT_LIST_HEAD(&owner->controllers);
mutex_init(&owner->rpm_lock);
dev->archdata.iommu = owner;
}