Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=42d00284e16bf998f8f93ce5d061df81b0ff283e
Commit: 42d00284e16bf998f8f93ce5d061df81b0ff283e
Parent: 4d57cdfacaa1c207bf4c071f89835e0368766a50
Author: FUJITA Tomonori <[EMAIL PROTECTED]>
AuthorDate: Mon Feb 4 22:27:56 2008 -0800
Committer: Linus Torvalds <[EMAIL PROTECTED]>
CommitDate: Tue Feb 5 09:44:10 2008 -0800
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 <[EMAIL PROTECTED]>
Cc: Jeff Garzik <[EMAIL PROTECTED]>
Cc: James Bottomley <[EMAIL PROTECTED]>
Acked-by: Jens Axboe <[EMAIL PROTECTED]>
Cc: Dave Airlie <[EMAIL PROTECTED]>
Cc: Thomas Gleixner <[EMAIL PROTECTED]>
Cc: Ingo Molnar <[EMAIL PROTECTED]>
Cc: Andi Kleen <[EMAIL PROTECTED]>
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>
---
arch/x86/kernel/pci-gart_64.c | 7 +++++++
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 845cbec..5ee700f 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;
-
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