On Wed, 2008-01-09 at 14:13 +0900, Tejun Heo wrote:
James Bottomley wrote:
Also, DMA alignment at
block layer isn't enough for ATA. ATA needs drain buffers for ATAPI
commands with variable length response. :-(
OK, where is this in the libata code? The dma_pad size is only 4 bytes,
James Bottomley wrote:
ATA requires that all DMA transfers begin and end on word boundaries.
Because of this, a large amount of machinery grew up in ide to adjust
scatterlists on this basis. However, as of 2.5, the block layer has a
dma_alignment variable which ensures both the beginning and
On Wed, 2008-01-09 at 11:10 +0900, Tejun Heo wrote:
James Bottomley wrote:
ATA requires that all DMA transfers begin and end on word boundaries.
Because of this, a large amount of machinery grew up in ide to adjust
scatterlists on this basis. However, as of 2.5, the block layer has a
James Bottomley wrote:
Also, DMA alignment at
block layer isn't enough for ATA. ATA needs drain buffers for ATAPI
commands with variable length response. :-(
OK, where is this in the libata code? The dma_pad size is only 4 bytes,
so this drain, I assume is only a word long? Given the
On Mon, 31 Dec 2007 15:56:08 -0600
James Bottomley [EMAIL PROTECTED] wrote:
ATA requires that all DMA transfers begin and end on word boundaries.
Because of this, a large amount of machinery grew up in ide to adjust
scatterlists on this basis. However, as of 2.5, the block layer has a
On Thu, 2008-01-03 at 16:58 +0900, FUJITA Tomonori wrote:
On Mon, 31 Dec 2007 15:56:08 -0600
James Bottomley [EMAIL PROTECTED] wrote:
@@ -1080,24 +1073,15 @@ extern void ata_port_pbar_desc(struct ata_port *ap,
int bar, ssize_t offset,
static inline struct scatterlist *
ATA requires that all DMA transfers begin and end on word boundaries.
Because of this, a large amount of machinery grew up in ide to adjust
scatterlists on this basis. However, as of 2.5, the block layer has a
dma_alignment variable which ensures both the beginning and length of a
DMA transfer
James Bottomley wrote:
ATA requires that all DMA transfers begin and end on word boundaries.
Because of this, a large amount of machinery grew up in ide to adjust
scatterlists on this basis. However, as of 2.5, the block layer has a
dma_alignment variable which ensures both the beginning and
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