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authorFUJITA Tomonori <tomof@acm.org>2008-02-04 22:27:56 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2008-02-05 09:44:10 -0800
commit42d00284e16bf998f8f93ce5d061df81b0ff283e (patch)
tree1318ceca16b25b16080040f3639da885cf3135ac /arch/x86
parent4d57cdfacaa1c207bf4c071f89835e0368766a50 (diff)
iommu sg merging: x86: make pci-gart iommu respect the segment size limits
This patch makes pci-gart iommu respect segment size limits when merging sg lists. Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Cc: Jeff Garzik <jeff@garzik.org> Cc: James Bottomley <James.Bottomley@steeleye.com> Acked-by: Jens Axboe <jens.axboe@oracle.com> Cc: Dave Airlie <airlied@linux.ie> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@elte.hu> Cc: Andi Kleen <ak@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/x86')
-rw-r--r--arch/x86/kernel/pci-gart_64.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/x86/kernel/pci-gart_64.c b/arch/x86/kernel/pci-gart_64.c
index 845cbecd68e..5ee700f0844 100644
--- a/arch/x86/kernel/pci-gart_64.c
+++ b/arch/x86/kernel/pci-gart_64.c
@@ -416,6 +416,8 @@ gart_map_sg(struct device *dev, struct scatterlist *sg, int nents, int dir)
struct scatterlist *s, *ps, *start_sg, *sgmap;
int need = 0, nextneed, i, out, start;
unsigned long pages = 0;
+ unsigned int seg_size;
+ unsigned int max_seg_size;
if (nents == 0)
return 0;
@@ -426,6 +428,8 @@ gart_map_sg(struct device *dev, struct scatterlist *sg, int nents, int dir)
out = 0;
start = 0;
start_sg = sgmap = sg;
+ seg_size = 0;
+ max_seg_size = dma_get_max_seg_size(dev);
ps = NULL; /* shut up gcc */
for_each_sg(sg, s, nents, i) {
dma_addr_t addr = sg_phys(s);
@@ -443,11 +447,13 @@ gart_map_sg(struct device *dev, struct scatterlist *sg, int nents, int dir)
* offset.
*/
if (!iommu_merge || !nextneed || !need || s->offset ||
+ (s->length + seg_size > max_seg_size) ||
(ps->offset + ps->length) % PAGE_SIZE) {
if (dma_map_cont(start_sg, i - start, sgmap,
pages, need) < 0)
goto error;
out++;
+ seg_size = 0;
sgmap = sg_next(sgmap);
pages = 0;
start = i;
@@ -455,6 +461,7 @@ gart_map_sg(struct device *dev, struct scatterlist *sg, int nents, int dir)
}
}
+ seg_size += s->length;
need = nextneed;
pages += to_pages(s->offset, s->length);
ps = s;