This patch adds support for assigning more than one SYSMMU controller to
the master device. This has been achieved simply by chaning the struct
device pointer in struct exynos_iommu_owner into the list of struct
sysmmu_drvdata of all controllers assigned to the given master device.
Signed-off-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
---
drivers/iommu/exynos-iommu.c | 11 +++++------
1 file changed, 5 insertions(+), 6 deletions(-)
diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c
index f2eceb6605c5..598660c87410 100644
--- a/drivers/iommu/exynos-iommu.c
+++ b/drivers/iommu/exynos-iommu.c
@@ -186,7 +186,7 @@ static char *sysmmu_fault_name[SYSMMU_FAULTS_NUM] = {
/* attached to dev.archdata.iommu of the master device */
struct exynos_iommu_owner {
- struct device *sysmmu;
+ struct list_head clients;
};
struct exynos_iommu_domain {
@@ -208,6 +208,7 @@ struct sysmmu_drvdata {
spinlock_t lock;
struct iommu_domain *domain;
struct list_head domain_node;
+ struct list_head owner_node;
phys_addr_t pgtable;
int version;
};
@@ -700,8 +701,7 @@ static int exynos_iommu_attach_device(struct iommu_domain *domain,
if (!has_sysmmu(dev))
return -ENODEV;
- data = dev_get_drvdata(owner->sysmmu);
- if (data) {
+ list_for_each_entry(data, &owner->clients, owner_node) {
ret = __sysmmu_enable(data, pagetable, domain);
if (ret >= 0) {
data->master = dev;
@@ -729,7 +729,7 @@ static void exynos_iommu_detach_device(struct iommu_domain *domain,
{
struct exynos_iommu_domain *priv = to_exynos_domain(domain);
phys_addr_t pagetable = virt_to_phys(priv->pgtable);
- struct sysmmu_drvdata *data;
+ struct sysmmu_drvdata *data, *next;
unsigned long flags;
bool found = false;
@@ -737,14 +737,13 @@ static void exynos_iommu_detach_device(struct iommu_domain *domain,
return;
spin_lock_irqsave(&priv->lock, flags);
- list_for_each_entry(data, &priv->clients, domain_node) {
+ list_for_each_entry_safe(data, next, &priv->clients, domain_node) {
if (data->master == dev) {
if (__sysmmu_disable(data)) {
data->master = NULL;
list_del_init(&data->domain_node);
}
found = true;
- break;
}
}
spin_unlock_irqrestore(&priv->lock, flags);
--
1.9.2
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