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iommu/exynos: Rework and fix internal locking 

This patch reworks locking in the exynos_iommu_attach/detach_device
functions to ensure that all entries of the sysmmu_drvdata and
exynos_iommu_owner structure are updated under the respective spinlocks,
while runtime pm functions are called without any spinlocks held.

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 11:08:10 +01:00 committed by Joerg Roedel
parent 92798b4566
commit e11723000f
1 changed files with 19 additions and 8 deletions
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27
drivers/iommu/exynos-iommu.c
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@ -769,10 +769,12 @@ static void exynos_iommu_domain_free(struct iommu_domain *iommu_domain)
spin_lock_irqsave(&domain->lock, flags);
list_for_each_entry_safe(data, next, &domain->clients, domain_node) {
spin_lock(&data->lock);
__sysmmu_disable(data);
data->pgtable = 0;
data->domain = NULL;
list_del_init(&data->domain_node);
spin_unlock(&data->lock);
}
spin_unlock_irqrestore(&domain->lock, flags);
@ -810,17 +812,22 @@ static void exynos_iommu_detach_device(struct iommu_domain *iommu_domain,
if (!has_sysmmu(dev) || owner->domain != iommu_domain)
return;
list_for_each_entry(data, &owner->controllers, owner_node) {
__sysmmu_disable(data);
pm_runtime_put(data->sysmmu);
}
spin_lock_irqsave(&domain->lock, flags);
list_for_each_entry_safe(data, next, &domain->clients, domain_node) {
__sysmmu_disable(data);
spin_lock(&data->lock);
data->pgtable = 0;
data->domain = NULL;
list_del_init(&data->domain_node);
pm_runtime_put(data->sysmmu);
spin_unlock(&data->lock);
}
owner->domain = NULL;
spin_unlock_irqrestore(&domain->lock, flags);
owner->domain = NULL;
dev_dbg(dev, "%s: Detached IOMMU with pgtable %pa\n", __func__,
&pagetable);
@ -841,18 +848,22 @@ static int exynos_iommu_attach_device(struct iommu_domain *iommu_domain,
if (owner->domain)
exynos_iommu_detach_device(owner->domain, dev);
spin_lock_irqsave(&domain->lock, flags);
list_for_each_entry(data, &owner->controllers, owner_node) {
spin_lock(&data->lock);
data->pgtable = pagetable;
data->domain = domain;
list_add_tail(&data->domain_node, &domain->clients);
spin_unlock(&data->lock);
}
owner->domain = iommu_domain;
spin_unlock_irqrestore(&domain->lock, flags);
list_for_each_entry(data, &owner->controllers, owner_node) {
pm_runtime_get_sync(data->sysmmu);
__sysmmu_enable(data);
spin_lock_irqsave(&domain->lock, flags);
list_add_tail(&data->domain_node, &domain->clients);
spin_unlock_irqrestore(&domain->lock, flags);
}
owner->domain = iommu_domain;
dev_dbg(dev, "%s: Attached IOMMU with pgtable %pa\n", __func__,
&pagetable);