iommu: Tidy up window attributes

The external interface to get/set window attributes is already
abstracted behind iommu_domain_{get,set}_attr(), so there's no real
reason for the internal interface to be different. Since we only have
one window-based driver anyway, clean up the core code by just moving
the DOMAIN_ATTR_WINDOWS handling directly into the PAMU driver.
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>

drivers/iommu/fsl_pamu_domain.c

@@ -818,6 +818,7 @@ static int fsl_pamu_set_domain_attr(struct iommu_domain *domain,
 				    enum iommu_attr attr_type, void *data)
 {
 	struct fsl_dma_domain *dma_domain = to_fsl_dma_domain(domain);
+	u32 *count;
 	int ret = 0;
 
 	switch (attr_type) {
@@ -829,6 +830,15 @@ static int fsl_pamu_set_domain_attr(struct iommu_domain *domain,
 		break;
 	case DOMAIN_ATTR_FSL_PAMU_ENABLE:
 		ret = configure_domain_dma_state(dma_domain, *(int *)data);
+		break;
+	case DOMAIN_ATTR_WINDOWS:
+		count = data;
+
+		if (domain->ops->domain_set_windows != NULL)
+			ret = domain->ops->domain_set_windows(domain, *count);
+		else
+			ret = -ENODEV;
+
 		break;
 	default:
 		pr_debug("Unsupported attribute type\n");
@@ -843,6 +853,7 @@ static int fsl_pamu_get_domain_attr(struct iommu_domain *domain,
 				    enum iommu_attr attr_type, void *data)
 {
 	struct fsl_dma_domain *dma_domain = to_fsl_dma_domain(domain);
+	u32 *count;
 	int ret = 0;
 
 	switch (attr_type) {
@@ -855,6 +866,15 @@ static int fsl_pamu_get_domain_attr(struct iommu_domain *domain,
 		break;
 	case DOMAIN_ATTR_FSL_PAMUV1:
 		*(int *)data = DOMAIN_ATTR_FSL_PAMUV1;
+		break;
+	case DOMAIN_ATTR_WINDOWS:
+		count = data;
+
+		if (domain->ops->domain_get_windows != NULL)
+			*count = domain->ops->domain_get_windows(domain);
+		else
+			ret = -ENODEV;
+
 		break;
 	default:
 		pr_debug("Unsupported attribute type\n");

drivers/iommu/iommu.c

@@ -1805,7 +1805,6 @@ int iommu_domain_get_attr(struct iommu_domain *domain,
 	struct iommu_domain_geometry *geometry;
 	bool *paging;
 	int ret = 0;
-	u32 *count;
 
 	switch (attr) {
 	case DOMAIN_ATTR_GEOMETRY:
@@ -1816,15 +1815,6 @@ int iommu_domain_get_attr(struct iommu_domain *domain,
 	case DOMAIN_ATTR_PAGING:
 		paging  = data;
 		*paging = (domain->pgsize_bitmap != 0UL);
-		break;
-	case DOMAIN_ATTR_WINDOWS:
-		count = data;
-
-		if (domain->ops->domain_get_windows != NULL)
-			*count = domain->ops->domain_get_windows(domain);
-		else
-			ret = -ENODEV;
-
 		break;
 	default:
 		if (!domain->ops->domain_get_attr)
@@ -1841,18 +1831,8 @@ int iommu_domain_set_attr(struct iommu_domain *domain,
 			  enum iommu_attr attr, void *data)
 {
 	int ret = 0;
-	u32 *count;
 
 	switch (attr) {
-	case DOMAIN_ATTR_WINDOWS:
-		count = data;
-
-		if (domain->ops->domain_set_windows != NULL)
-			ret = domain->ops->domain_set_windows(domain, *count);
-		else
-			ret = -ENODEV;
-
-		break;
 	default:
 		if (domain->ops->domain_set_attr == NULL)
 			return -EINVAL;