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authorJens Axboe <jens.axboe@oracle.com>2007-08-07 09:37:10 +0200
committerJens Axboe <jens.axboe@oracle.com>2007-10-16 11:27:32 +0200
commit2c941a204070ab32d92d40318a3196a7fb994c00 (patch)
tree94dc01c168b8330ab0390faeb602728a82e64df6 /arch/sparc64/kernel/pci_sun4v.c
parent0912a5db0ea45d8aef3ee99a882e093285e32c3c (diff)
SPARC64: sg chaining support
This updates the sparc64 iommu/pci dma mappers to sg chaining. Acked-by: David S. Miller <davem@davemloft.net> Later updated to newer kernel with unified sparc64 iommu sg handling. Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'arch/sparc64/kernel/pci_sun4v.c')
-rw-r--r--arch/sparc64/kernel/pci_sun4v.c32
1 files changed, 19 insertions, 13 deletions
diff --git a/arch/sparc64/kernel/pci_sun4v.c b/arch/sparc64/kernel/pci_sun4v.c
index 95de1444ee6..cacacfae545 100644
--- a/arch/sparc64/kernel/pci_sun4v.c
+++ b/arch/sparc64/kernel/pci_sun4v.c
@@ -13,6 +13,7 @@
#include <linux/irq.h>
#include <linux/msi.h>
#include <linux/log2.h>
+#include <linux/scatterlist.h>
#include <asm/iommu.h>
#include <asm/irq.h>
@@ -373,7 +374,7 @@ static inline long fill_sg(long entry, struct device *dev,
int nused, int nelems, unsigned long prot)
{
struct scatterlist *dma_sg = sg;
- struct scatterlist *sg_end = sg + nelems;
+ struct scatterlist *sg_end = sg_last(sg, nelems);
unsigned long flags;
int i;
@@ -413,7 +414,7 @@ static inline long fill_sg(long entry, struct device *dev,
len -= (IO_PAGE_SIZE - (tmp & (IO_PAGE_SIZE - 1UL)));
break;
}
- sg++;
+ sg = sg_next(sg);
}
pteval = (pteval & IOPTE_PAGE);
@@ -431,24 +432,25 @@ static inline long fill_sg(long entry, struct device *dev,
}
pteval = (pteval & IOPTE_PAGE) + len;
- sg++;
+ sg = sg_next(sg);
/* Skip over any tail mappings we've fully mapped,
* adjusting pteval along the way. Stop when we
* detect a page crossing event.
*/
- while (sg < sg_end &&
- (pteval << (64 - IO_PAGE_SHIFT)) != 0UL &&
+ while ((pteval << (64 - IO_PAGE_SHIFT)) != 0UL &&
(pteval == SG_ENT_PHYS_ADDRESS(sg)) &&
((pteval ^
(SG_ENT_PHYS_ADDRESS(sg) + sg->length - 1UL)) >> IO_PAGE_SHIFT) == 0UL) {
pteval += sg->length;
- sg++;
+ if (sg == sg_end)
+ break;
+ sg = sg_next(sg);
}
if ((pteval << (64 - IO_PAGE_SHIFT)) == 0UL)
pteval = ~0UL;
} while (dma_npages != 0);
- dma_sg++;
+ dma_sg = sg_next(dma_sg);
}
if (unlikely(iommu_batch_end() < 0L))
@@ -510,7 +512,7 @@ static int dma_4v_map_sg(struct device *dev, struct scatterlist *sglist,
sgtmp = sglist;
while (used && sgtmp->dma_length) {
sgtmp->dma_address += dma_base;
- sgtmp++;
+ sgtmp = sg_next(sgtmp);
used--;
}
used = nelems - used;
@@ -545,6 +547,7 @@ static void dma_4v_unmap_sg(struct device *dev, struct scatterlist *sglist,
struct pci_pbm_info *pbm;
struct iommu *iommu;
unsigned long flags, i, npages;
+ struct scatterlist *sg, *sgprv;
long entry;
u32 devhandle, bus_addr;
@@ -558,12 +561,15 @@ static void dma_4v_unmap_sg(struct device *dev, struct scatterlist *sglist,
devhandle = pbm->devhandle;
bus_addr = sglist->dma_address & IO_PAGE_MASK;
-
- for (i = 1; i < nelems; i++)
- if (sglist[i].dma_length == 0)
+ sgprv = NULL;
+ for_each_sg(sglist, sg, nelems, i) {
+ if (sg->dma_length == 0)
break;
- i--;
- npages = (IO_PAGE_ALIGN(sglist[i].dma_address + sglist[i].dma_length) -
+
+ sgprv = sg;
+ }
+
+ npages = (IO_PAGE_ALIGN(sgprv->dma_address + sgprv->dma_length) -
bus_addr) >> IO_PAGE_SHIFT;
entry = ((bus_addr - iommu->page_table_map_base) >> IO_PAGE_SHIFT);