The patch titled
iommu sg merging: parisc: make iommu respect the segment size limits
has been removed from the -mm tree. Its filename was
iommu-sg-merging-parisc-make-iommu-respect-the-segment-size-limits.patch
This patch was dropped because it was merged into mainline or a subsystem tree
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: iommu sg merging: parisc: make iommu respect the segment size limits
From: FUJITA Tomonori <tomof@xxxxxxx>
This patch makes iommu respect segment size limits when merging sg
lists.
Signed-off-by: FUJITA Tomonori <fujita.tomonori@xxxxxxxxxxxxx>
Cc: Jeff Garzik <jeff@xxxxxxxxxx>
Cc: James Bottomley <James.Bottomley@xxxxxxxxxxxx>
Acked-by: Jens Axboe <jens.axboe@xxxxxxxxxx>
Cc: Kyle McMartin <kyle@xxxxxxxxxxx>
Acked-by: Grant Grundler <grundler@xxxxxxxxxxxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/parisc/ccio-dma.c | 2 +-
drivers/parisc/iommu-helpers.h | 7 ++++++-
drivers/parisc/sba_iommu.c | 2 +-
3 files changed, 8 insertions(+), 3 deletions(-)
diff -puN drivers/parisc/ccio-dma.c~iommu-sg-merging-parisc-make-iommu-respect-the-segment-size-limits drivers/parisc/ccio-dma.c
--- a/drivers/parisc/ccio-dma.c~iommu-sg-merging-parisc-make-iommu-respect-the-segment-size-limits
+++ a/drivers/parisc/ccio-dma.c
@@ -941,7 +941,7 @@ ccio_map_sg(struct device *dev, struct s
** w/o this association, we wouldn't have coherent DMA!
** Access to the virtual address is what forces a two pass algorithm.
*/
- coalesced = iommu_coalesce_chunks(ioc, sglist, nents, ccio_alloc_range);
+ coalesced = iommu_coalesce_chunks(ioc, dev, sglist, nents, ccio_alloc_range);
/*
** Program the I/O Pdir
diff -puN drivers/parisc/iommu-helpers.h~iommu-sg-merging-parisc-make-iommu-respect-the-segment-size-limits drivers/parisc/iommu-helpers.h
--- a/drivers/parisc/iommu-helpers.h~iommu-sg-merging-parisc-make-iommu-respect-the-segment-size-limits
+++ a/drivers/parisc/iommu-helpers.h
@@ -95,12 +95,14 @@ iommu_fill_pdir(struct ioc *ioc, struct
*/
static inline unsigned int
-iommu_coalesce_chunks(struct ioc *ioc, struct scatterlist *startsg, int nents,
+iommu_coalesce_chunks(struct ioc *ioc, struct device *dev,
+ struct scatterlist *startsg, int nents,
int (*iommu_alloc_range)(struct ioc *, size_t))
{
struct scatterlist *contig_sg; /* contig chunk head */
unsigned long dma_offset, dma_len; /* start/len of DMA stream */
unsigned int n_mappings = 0;
+ unsigned int max_seg_size = dma_get_max_seg_size(dev);
while (nents > 0) {
@@ -142,6 +144,9 @@ iommu_coalesce_chunks(struct ioc *ioc, s
IOVP_SIZE) > DMA_CHUNK_SIZE))
break;
+ if (startsg->length + dma_len > max_seg_size)
+ break;
+
/*
** Next see if we can append the next chunk (i.e.
** it must end on one page and begin on another
diff -puN drivers/parisc/sba_iommu.c~iommu-sg-merging-parisc-make-iommu-respect-the-segment-size-limits drivers/parisc/sba_iommu.c
--- a/drivers/parisc/sba_iommu.c~iommu-sg-merging-parisc-make-iommu-respect-the-segment-size-limits
+++ a/drivers/parisc/sba_iommu.c
@@ -946,7 +946,7 @@ sba_map_sg(struct device *dev, struct sc
** w/o this association, we wouldn't have coherent DMA!
** Access to the virtual address is what forces a two pass algorithm.
*/
- coalesced = iommu_coalesce_chunks(ioc, sglist, nents, sba_alloc_range);
+ coalesced = iommu_coalesce_chunks(ioc, dev, sglist, nents, sba_alloc_range);
/*
** Program the I/O Pdir
_
Patches currently in -mm which might be from tomof@xxxxxxx are
origin.patch
-
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