IA64: sg chaining support

This updates the ia64 iommu/pci dma mappers to sg chaining.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

2 files changed, 13 insertions, 12 deletions

diff --git a/arch/ia64/hp/common/sba_iommu.c b/arch/ia64/hp/common/sba_iommu.c
index e980e7aa2306..4338f4123f31 100644
--- a/arch/ia64/hp/common/sba_iommu.c
+++ b/arch/ia64/hp/common/sba_iommu.c
@@ -396,7 +396,7 @@ sba_dump_sg( struct ioc *ioc, struct scatterlist *startsg, int nents)
                 printk(KERN_DEBUG " %d : DMA %08lx/%05x CPU %p\n", nents,
                        startsg->dma_address, startsg->dma_length,
                        sba_sg_address(startsg));
-                startsg++;
+                startsg = sg_next(startsg);
         }
 }
 
@@ -409,7 +409,7 @@ sba_check_sg( struct ioc *ioc, struct scatterlist *startsg, int nents)
         while (the_nents-- > 0) {
                 if (sba_sg_address(the_sg) == 0x0UL)
                         sba_dump_sg(NULL, startsg, nents);
-                the_sg++;
+                the_sg = sg_next(the_sg);
         }
 }
 
@@ -1201,7 +1201,7 @@ sba_fill_pdir(
                         u32 pide = startsg->dma_address & ~PIDE_FLAG;
                         dma_offset = (unsigned long) pide & ~iovp_mask;
                         startsg->dma_address = 0;
-                        dma_sg++;
+                        dma_sg = sg_next(dma_sg);
                         dma_sg->dma_address = pide | ioc->ibase;
                         pdirp = &(ioc->pdir_base[pide >> iovp_shift]);
                         n_mappings++;
@@ -1228,7 +1228,7 @@ sba_fill_pdir(
                                 pdirp++;
                         } while (cnt > 0);
                 }
-                startsg++;
+                startsg = sg_next(startsg);
         }
         /* force pdir update */
         wmb();
@@ -1297,7 +1297,7 @@ sba_coalesce_chunks( struct ioc *ioc,
                 while (--nents > 0) {
                         unsigned long vaddr;    /* tmp */
 
-                        startsg++;
+                        startsg = sg_next(startsg);
 
                         /* PARANOID */
                         startsg->dma_address = startsg->dma_length = 0;
@@ -1407,7 +1407,7 @@ int sba_map_sg(struct device *dev, struct scatterlist *sglist, int nents, int di
 #ifdef ALLOW_IOV_BYPASS_SG
         ASSERT(to_pci_dev(dev)->dma_mask);
         if (likely((ioc->dma_mask & ~to_pci_dev(dev)->dma_mask) == 0)) {
-                for (sg = sglist ; filled < nents ; filled++, sg++){
+                for_each_sg(sglist, sg, nents, filled) {
                         sg->dma_length = sg->length;
                         sg->dma_address = virt_to_phys(sba_sg_address(sg));
                 }
@@ -1501,7 +1501,7 @@ void sba_unmap_sg (struct device *dev, struct scatterlist *sglist, int nents, in
         while (nents && sglist->dma_length) {
 
                 sba_unmap_single(dev, sglist->dma_address, sglist->dma_length, dir);
-                sglist++;
+                sglist = sg_next(sglist);
                 nents--;
         }
 
diff --git a/arch/ia64/sn/pci/pci_dma.c b/arch/ia64/sn/pci/pci_dma.c
index d79ddacfba2d..ecd8a52b9b9e 100644
--- a/arch/ia64/sn/pci/pci_dma.c
+++ b/arch/ia64/sn/pci/pci_dma.c
@@ -218,16 +218,17 @@ EXPORT_SYMBOL(sn_dma_unmap_single);
  *
  * Unmap a set of streaming mode DMA translations.
  */
-void sn_dma_unmap_sg(struct device *dev, struct scatterlist *sg,
+void sn_dma_unmap_sg(struct device *dev, struct scatterlist *sgl,
                      int nhwentries, int direction)
 {
         int i;
         struct pci_dev *pdev = to_pci_dev(dev);
         struct sn_pcibus_provider *provider = SN_PCIDEV_BUSPROVIDER(pdev);
+        struct scatterlist *sg;
 
         BUG_ON(dev->bus != &pci_bus_type);
 
-        for (i = 0; i < nhwentries; i++, sg++) {
+        for_each_sg(sgl, sg, nhwentries, i) {
                 provider->dma_unmap(pdev, sg->dma_address, direction);
                 sg->dma_address = (dma_addr_t) NULL;
                 sg->dma_length = 0;
@@ -244,11 +245,11 @@ EXPORT_SYMBOL(sn_dma_unmap_sg);
  *
  * Maps each entry of @sg for DMA.
  */
-int sn_dma_map_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
+int sn_dma_map_sg(struct device *dev, struct scatterlist *sgl, int nhwentries,
                   int direction)
 {
         unsigned long phys_addr;
-        struct scatterlist *saved_sg = sg;
+        struct scatterlist *saved_sg = sgl, *sg;
         struct pci_dev *pdev = to_pci_dev(dev);
         struct sn_pcibus_provider *provider = SN_PCIDEV_BUSPROVIDER(pdev);
         int i;
@@ -258,7 +259,7 @@ int sn_dma_map_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
         /*
          * Setup a DMA address for each entry in the scatterlist.
          */
-        for (i = 0; i < nhwentries; i++, sg++) {
+        for_each_sg(sgl, sg, nhwentries, i) {
                 phys_addr = SG_ENT_PHYS_ADDRESS(sg);
                 sg->dma_address = provider->dma_map(pdev,
                                                     phys_addr, sg->length,