x86/amd-iommu: Remove iommu specific handling from dma_ops path

This patch finishes the removal of all iommu specific
handling code in the dma_ops path.
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>

arch/x86/kernel/amd_iommu.c

@@ -1436,11 +1436,11 @@ static struct dma_ops_domain *find_protection_domain(u16 devid)
  * in this function.
  */
 static bool get_device_resources(struct device *dev,
-				 struct amd_iommu **iommu,
 				 struct protection_domain **domain,
 				 u16 *bdf)
 {
 	struct dma_ops_domain *dma_dom;
+	struct amd_iommu *iommu;
 	struct pci_dev *pcidev;
 	u16 _bdf;
 
@@ -1450,21 +1450,21 @@ static bool get_device_resources(struct device *dev,
 	pcidev  = to_pci_dev(dev);
 	_bdf    = calc_devid(pcidev->bus->number, pcidev->devfn);
 	*bdf    = amd_iommu_alias_table[_bdf];
-	*iommu  = amd_iommu_rlookup_table[*bdf];
+	iommu   = amd_iommu_rlookup_table[*bdf];
 	*domain = domain_for_device(*bdf);
 
 	if (*domain == NULL) {
 		dma_dom = find_protection_domain(*bdf);
 		if (!dma_dom)
-			dma_dom = (*iommu)->default_dom;
+			dma_dom = iommu->default_dom;
 		*domain = &dma_dom->domain;
-		attach_device(*iommu, *domain, *bdf);
+		attach_device(iommu, *domain, *bdf);
 		DUMP_printk("Using protection domain %d for device %s\n",
 			    (*domain)->id, dev_name(dev));
 	}
 
 	if (domain_for_device(_bdf) == NULL)
-		attach_device(*iommu, *domain, _bdf);
+		attach_device(iommu, *domain, _bdf);
 
 	return true;
 }
@@ -1776,7 +1776,6 @@ static dma_addr_t map_page(struct device *dev, struct page *page,
 			   struct dma_attrs *attrs)
 {
 	unsigned long flags;
-	struct amd_iommu *iommu;
 	struct protection_domain *domain;
 	u16 devid;
 	dma_addr_t addr;
@@ -1785,7 +1784,7 @@ static dma_addr_t map_page(struct device *dev, struct page *page,
 
 	INC_STATS_COUNTER(cnt_map_single);
 
-	if (!get_device_resources(dev, &iommu, &domain, &devid))
+	if (!get_device_resources(dev, &domain, &devid))
 		/* device not handled by any AMD IOMMU */
 		return (dma_addr_t)paddr;
 
@@ -1815,13 +1814,12 @@ static void unmap_page(struct device *dev, dma_addr_t dma_addr, size_t size,
 		       enum dma_data_direction dir, struct dma_attrs *attrs)
 {
 	unsigned long flags;
-	struct amd_iommu *iommu;
 	struct protection_domain *domain;
 	u16 devid;
 
 	INC_STATS_COUNTER(cnt_unmap_single);
 
-	if (!get_device_resources(dev, &iommu, &domain, &devid))
+	if (!get_device_resources(dev, &domain, &devid))
 		/* device not handled by any AMD IOMMU */
 		return;
 
@@ -1864,7 +1862,6 @@ static int map_sg(struct device *dev, struct scatterlist *sglist,
 		  struct dma_attrs *attrs)
 {
 	unsigned long flags;
-	struct amd_iommu *iommu;
 	struct protection_domain *domain;
 	u16 devid;
 	int i;
@@ -1875,7 +1872,7 @@ static int map_sg(struct device *dev, struct scatterlist *sglist,
 
 	INC_STATS_COUNTER(cnt_map_sg);
 
-	if (!get_device_resources(dev, &iommu, &domain, &devid))
+	if (!get_device_resources(dev, &domain, &devid))
 		return map_sg_no_iommu(dev, sglist, nelems, dir);
 
 	dma_mask = *dev->dma_mask;
@@ -1927,7 +1924,6 @@ static void unmap_sg(struct device *dev, struct scatterlist *sglist,
 		     struct dma_attrs *attrs)
 {
 	unsigned long flags;
-	struct amd_iommu *iommu;
 	struct protection_domain *domain;
 	struct scatterlist *s;
 	u16 devid;
@@ -1935,7 +1931,7 @@ static void unmap_sg(struct device *dev, struct scatterlist *sglist,
 
 	INC_STATS_COUNTER(cnt_unmap_sg);
 
-	if (!get_device_resources(dev, &iommu, &domain, &devid))
+	if (!get_device_resources(dev, &domain, &devid))
 		return;
 
 	if (!dma_ops_domain(domain))
@@ -1962,7 +1958,6 @@ static void *alloc_coherent(struct device *dev, size_t size,
 {
 	unsigned long flags;
 	void *virt_addr;
-	struct amd_iommu *iommu;
 	struct protection_domain *domain;
 	u16 devid;
 	phys_addr_t paddr;
@@ -1970,7 +1965,7 @@ static void *alloc_coherent(struct device *dev, size_t size,
 
 	INC_STATS_COUNTER(cnt_alloc_coherent);
 
-	if (!get_device_resources(dev, &iommu, &domain, &devid)) {
+	if (!get_device_resources(dev, &domain, &devid)) {
 		virt_addr = (void *)__get_free_pages(flag, get_order(size));
 		*dma_addr = __pa(virt_addr);
 		return virt_addr;
@@ -2022,13 +2017,12 @@ static void free_coherent(struct device *dev, size_t size,
 			  void *virt_addr, dma_addr_t dma_addr)
 {
 	unsigned long flags;
-	struct amd_iommu *iommu;
 	struct protection_domain *domain;
 	u16 devid;
 
 	INC_STATS_COUNTER(cnt_free_coherent);
 
-	if (!get_device_resources(dev, &iommu, &domain, &devid))
+	if (!get_device_resources(dev, &domain, &devid))
 		goto free_mem;
 
 	if (!dma_ops_domain(domain))