SPARC: sg chaining support

This updates the sparc iommu/pci dma mappers to sg chaining.

Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

1 files changed, 13 insertions, 12 deletions

diff --git a/arch/sparc/kernel/ioport.c b/arch/sparc/kernel/ioport.c
index 62182d2d7b0d..9c3ed88853f3 100644
--- a/arch/sparc/kernel/ioport.c
+++ b/arch/sparc/kernel/ioport.c
@@ -35,6 +35,7 @@
 #include <linux/slab.h>
 #include <linux/pci.h>          /* struct pci_dev */
 #include <linux/proc_fs.h>
+#include <linux/scatterlist.h>
 
 #include <asm/io.h>
 #include <asm/vaddrs.h>
@@ -717,19 +718,19 @@ void pci_unmap_page(struct pci_dev *hwdev,
  * Device ownership issues as mentioned above for pci_map_single are
  * the same here.
  */
-int pci_map_sg(struct pci_dev *hwdev, struct scatterlist *sg, int nents,
+int pci_map_sg(struct pci_dev *hwdev, struct scatterlist *sgl, int nents,
     int direction)
 {
+        struct scatterlist *sg;
         int n;
 
         BUG_ON(direction == PCI_DMA_NONE);
         /* IIep is write-through, not flushing. */
-        for (n = 0; n < nents; n++) {
+        for_each_sg(sgl, sg, nents, n) {
                 BUG_ON(page_address(sg->page) == NULL);
                 sg->dvma_address =
                         virt_to_phys(page_address(sg->page)) + sg->offset;
                 sg->dvma_length = sg->length;
-                sg++;
         }
         return nents;
 }
@@ -738,19 +739,19 @@ int pci_map_sg(struct pci_dev *hwdev, struct scatterlist *sg, int nents,
  * Again, cpu read rules concerning calls here are the same as for
  * pci_unmap_single() above.
  */
-void pci_unmap_sg(struct pci_dev *hwdev, struct scatterlist *sg, int nents,
+void pci_unmap_sg(struct pci_dev *hwdev, struct scatterlist *sgl, int nents,
     int direction)
 {
+        struct scatterlist *sg;
         int n;
 
         BUG_ON(direction == PCI_DMA_NONE);
         if (direction != PCI_DMA_TODEVICE) {
-                for (n = 0; n < nents; n++) {
+                for_each_sg(sgl, sg, nents, n) {
                         BUG_ON(page_address(sg->page) == NULL);
                         mmu_inval_dma_area(
                             (unsigned long) page_address(sg->page),
                             (sg->length + PAGE_SIZE-1) & PAGE_MASK);
-                        sg++;
                 }
         }
 }
@@ -789,34 +790,34 @@ void pci_dma_sync_single_for_device(struct pci_dev *hwdev, dma_addr_t ba, size_t
  * The same as pci_dma_sync_single_* but for a scatter-gather list,
  * same rules and usage.
  */
-void pci_dma_sync_sg_for_cpu(struct pci_dev *hwdev, struct scatterlist *sg, int nents, int direction)
+void pci_dma_sync_sg_for_cpu(struct pci_dev *hwdev, struct scatterlist *sgl, int nents, int direction)
 {
+        struct scatterlist *sg;
         int n;
 
         BUG_ON(direction == PCI_DMA_NONE);
         if (direction != PCI_DMA_TODEVICE) {
-                for (n = 0; n < nents; n++) {
+                for_each_sg(sgl, sg, nents, n) {
                         BUG_ON(page_address(sg->page) == NULL);
                         mmu_inval_dma_area(
                             (unsigned long) page_address(sg->page),
                             (sg->length + PAGE_SIZE-1) & PAGE_MASK);
-                        sg++;
                 }
         }
 }
 
-void pci_dma_sync_sg_for_device(struct pci_dev *hwdev, struct scatterlist *sg, int nents, int direction)
+void pci_dma_sync_sg_for_device(struct pci_dev *hwdev, struct scatterlist *sgl, int nents, int direction)
 {
+        struct scatterlist *sg;
         int n;
 
         BUG_ON(direction == PCI_DMA_NONE);
         if (direction != PCI_DMA_TODEVICE) {
-                for (n = 0; n < nents; n++) {
+                for_each_sg(sgl, sg, nents, n) {
                         BUG_ON(page_address(sg->page) == NULL);
                         mmu_inval_dma_area(
                             (unsigned long) page_address(sg->page),
                             (sg->length + PAGE_SIZE-1) & PAGE_MASK);
-                        sg++;
                 }
         }
 }