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Commit 9b265536 authored by Marek Szyprowski's avatar Marek Szyprowski Committed by Joerg Roedel
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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: default avatarMarek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: default avatarJoerg Roedel <jroedel@suse.de>
parent e1172300

drivers/iommu/exynos-iommu.c

+36 −9
Original line number Diff line number Diff line
@@ -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 = {
@@ -813,6 +820,14 @@ static void exynos_iommu_detach_device(struct iommu_domain *iommu_domain, 
		return;



	list_for_each_entry(data, &owner->controllers, owner_node) {

		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);
@@ -860,8 +878,16 @@ static int exynos_iommu_attach_device(struct iommu_domain *iommu_domain, 
	spin_unlock_irqrestore(&domain->lock, flags);



	list_for_each_entry(data, &owner->controllers, owner_node) {

		pm_runtime_get_sync(data->sysmmu);

		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);

	}



	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;

	}