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Date: Tue, 08 Nov 2016 14:29:23 +0100
From: Marek Szyprowski <m.szyprowski@...sung.com>
To: linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
iommu@...ts.linux-foundation.org,
linux-samsung-soc@...r.kernel.org, Joerg Roedel <joro@...tes.org>
Cc: Marek Szyprowski <m.szyprowski@...sung.com>,
Inki Dae <inki.dae@...sung.com>, Kukjin Kim <kgene@...nel.org>,
Krzysztof Kozlowski <krzk@...nel.org>,
Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
"Rafael J. Wysocki" <rjw@...ysocki.net>,
Mark Brown <broonie@...nel.org>,
"Luis R. Rodriguez" <mcgrof@...nel.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Tomeu Vizoso <tomeu.vizoso@...labora.com>,
Lukas Wunner <lukas@...ner.de>,
Kevin Hilman <khilman@...nel.org>,
Tobias Jakobi <tjakobi@...h.uni-bielefeld.de>,
Tomasz Figa <tomasz.figa@...il.com>
Subject: [PATCH v6 6/7] 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@...sung.com>
---
drivers/iommu/exynos-iommu.c | 45 +++++++++++++++++++++++++++++++++++---------
1 file changed, 36 insertions(+), 9 deletions(-)
diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c
index a959443..5e6d7bb 100644
--- a/drivers/iommu/exynos-iommu.c
+++ b/drivers/iommu/exynos-iommu.c
@@ -206,6 +206,7 @@ struct sysmmu_fault_info {
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 */
};
/*
@@ -594,40 +595,46 @@ 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 = {
@@ -775,7 +782,15 @@ 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);
}
@@ -790,6 +805,7 @@ 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);
@@ -810,6 +826,8 @@ 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);
@@ -822,8 +840,16 @@ 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_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__,
@@ -1200,6 +1226,7 @@ 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;
}
--
1.9.1
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