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PPC: sg chaining support

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This updates the ppc iommu/pci dma mappers to sg chaining. Includes
further fixes from FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Jens Axboe
2007-10-12 13:44:12 +02:00
parent d1ed455e30
commit 78bdc3106a
5 changed files with 34 additions and 165 deletions
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23
arch/powerpc/kernel/iommu.c
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@@ -277,7 +277,7 @@ int iommu_map_sg(struct iommu_table *tbl, struct scatterlist *sglist,
dma_addr_t dma_next = 0, dma_addr;
unsigned long flags;
struct scatterlist *s, *outs, *segstart;
int outcount, incount;
int outcount, incount, i;
unsigned long handle;
BUG_ON(direction == DMA_NONE);
@@ -297,7 +297,7 @@ int iommu_map_sg(struct iommu_table *tbl, struct scatterlist *sglist,
spin_lock_irqsave(&(tbl->it_lock), flags);
for (s = outs; nelems; nelems--, s++) {
for_each_sg(sglist, s, nelems, i) {
unsigned long vaddr, npages, entry, slen;
slen = s->length;
@@ -341,7 +341,8 @@ int iommu_map_sg(struct iommu_table *tbl, struct scatterlist *sglist,
if (novmerge || (dma_addr != dma_next)) {
/* Can't merge: create a new segment */
segstart = s;
outcount++; outs++;
outcount++;
outs = sg_next(outs);
DBG(" can't merge, new segment.\n");
} else {
outs->dma_length += s->length;
@@ -374,7 +375,7 @@ int iommu_map_sg(struct iommu_table *tbl, struct scatterlist *sglist,
* next entry of the sglist if we didn't fill the list completely
*/
if (outcount < incount) {
outs++;
outs = sg_next(outs);
outs->dma_address = DMA_ERROR_CODE;
outs->dma_length = 0;
}
@@ -385,7 +386,7 @@ int iommu_map_sg(struct iommu_table *tbl, struct scatterlist *sglist,
return outcount;
failure:
for (s = &sglist[0]; s <= outs; s++) {
for_each_sg(sglist, s, nelems, i) {
if (s->dma_length != 0) {
unsigned long vaddr, npages;
@@ -395,6 +396,8 @@ int iommu_map_sg(struct iommu_table *tbl, struct scatterlist *sglist,
s->dma_address = DMA_ERROR_CODE;
s->dma_length = 0;
}
if (s == outs)
break;
}
spin_unlock_irqrestore(&(tbl->it_lock), flags);
return 0;
@@ -404,6 +407,7 @@ int iommu_map_sg(struct iommu_table *tbl, struct scatterlist *sglist,
void iommu_unmap_sg(struct iommu_table *tbl, struct scatterlist *sglist,
int nelems, enum dma_data_direction direction)
{
struct scatterlist *sg;
unsigned long flags;
BUG_ON(direction == DMA_NONE);
@@ -413,15 +417,16 @@ void iommu_unmap_sg(struct iommu_table *tbl, struct scatterlist *sglist,
spin_lock_irqsave(&(tbl->it_lock), flags);
sg = sglist;
while (nelems--) {
unsigned int npages;
dma_addr_t dma_handle = sglist->dma_address;
dma_addr_t dma_handle = sg->dma_address;
if (sglist->dma_length == 0)
if (sg->dma_length == 0)
break;
npages = iommu_num_pages(dma_handle,sglist->dma_length);
npages = iommu_num_pages(dma_handle, sg->dma_length);
__iommu_free(tbl, dma_handle, npages);
sglist++;
sg = sg_next(sg);
}
/* Flush/invalidate TLBs if necessary. As for iommu_free(), we