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async_xor: dma_map destination DMA_BIDIRECTIONAL 

Mapping the destination multiple times is a misuse of the dma-api.
Since the destination may be reused as a source, ensure that it is only
mapped once and that it is mapped bidirectionally.  This appears to add
ugliness on the unmap side in that it always reads back the destination
address from the descriptor, but gcc can determine that dma_unmap is a
nop and not emit the code that calculates its arguments.

Cc: <stable@kernel.org>
Cc: Saeed Bishara <saeed@marvell.com>
Acked-by: Yuri Tikhonov <yur@emcraft.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams 2008-12-08 13:46:00 -07:00
parent b0b42b16ff
commit a06d568f7c
3 changed files with 34 additions and 8 deletions
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11
crypto/async_tx/async_xor.c
View File

@ -53,10 +53,17 @@ do_async_xor(struct dma_chan *chan, struct page *dest, struct page **src_list,
int xor_src_cnt;
dma_addr_t dma_dest;
dma_dest = dma_map_page(dma->dev, dest, offset, len, DMA_FROM_DEVICE);
for (i = 0; i < src_cnt; i++)
/* map the dest bidrectional in case it is re-used as a source */
dma_dest = dma_map_page(dma->dev, dest, offset, len, DMA_BIDIRECTIONAL);
for (i = 0; i < src_cnt; i++) {
/* only map the dest once */
if (unlikely(src_list[i] == dest)) {
dma_src[i] = dma_dest;
continue;
}
dma_src[i] = dma_map_page(dma->dev, src_list[i], offset,
len, DMA_TO_DEVICE);
}
while (src_cnt) {
async_flags = flags;

16
drivers/dma/iop-adma.c
View File

@ -85,18 +85,28 @@ iop_adma_run_tx_complete_actions(struct iop_adma_desc_slot *desc,
enum dma_ctrl_flags flags = desc->async_tx.flags;
u32 src_cnt;
dma_addr_t addr;
dma_addr_t dest;
src_cnt = unmap->unmap_src_cnt;
dest = iop_desc_get_dest_addr(unmap, iop_chan);
if (!(flags & DMA_COMPL_SKIP_DEST_UNMAP)) {
addr = iop_desc_get_dest_addr(unmap, iop_chan);
dma_unmap_page(dev, addr, len, DMA_FROM_DEVICE);
enum dma_data_direction dir;
if (src_cnt > 1) /* is xor? */
dir = DMA_BIDIRECTIONAL;
else
dir = DMA_FROM_DEVICE;
dma_unmap_page(dev, dest, len, dir);
}
if (!(flags & DMA_COMPL_SKIP_SRC_UNMAP)) {
src_cnt = unmap->unmap_src_cnt;
while (src_cnt--) {
addr = iop_desc_get_src_addr(unmap,
iop_chan,
src_cnt);
if (addr == dest)
continue;
dma_unmap_page(dev, addr, len,
DMA_TO_DEVICE);
}

15
drivers/dma/mv_xor.c
View File

@ -311,17 +311,26 @@ mv_xor_run_tx_complete_actions(struct mv_xor_desc_slot *desc,
enum dma_ctrl_flags flags = desc->async_tx.flags;
u32 src_cnt;
dma_addr_t addr;
dma_addr_t dest;
src_cnt = unmap->unmap_src_cnt;
dest = mv_desc_get_dest_addr(unmap);
if (!(flags & DMA_COMPL_SKIP_DEST_UNMAP)) {
addr = mv_desc_get_dest_addr(unmap);
dma_unmap_page(dev, addr, len, DMA_FROM_DEVICE);
enum dma_data_direction dir;
if (src_cnt > 1) /* is xor ? */
dir = DMA_BIDIRECTIONAL;
else
dir = DMA_FROM_DEVICE;
dma_unmap_page(dev, dest, len, dir);
}
if (!(flags & DMA_COMPL_SKIP_SRC_UNMAP)) {
src_cnt = unmap->unmap_src_cnt;
while (src_cnt--) {
addr = mv_desc_get_src_addr(unmap,
src_cnt);
if (addr == dest)
continue;
dma_unmap_page(dev, addr, len,
DMA_TO_DEVICE);
}