Zoltan Boszormenyi wrote:
Hi,
thanks for publishing this.
Add the Software NCQ support to sata_nv.c for MCP51/MCP55/MCP61 SATA
controller.
This patch base on sata_nv.c file from kernel 2.6.22-rc1
See attachment for the patch.
Signed-off-by: Kuan Luo <[email protected]>
Signed-off-by: Peer Chen <[email protected]>
==================================
See attached file.
==================================
However, I saw this in the patch:
+ /* determine if physical DMA addr spans 64K boundary.
+ * Note h/w doesn't support 64-bit, so we unconditionally
+ * truncate dma_addr_t to u32.
+ */
+ addr = (u32) sg_dma_address(sg);
Does it mean that I can't upgrade my machine to 4 GB or more
without losing NCQ or risking data corruption?
Can the code be made IOMMU-aware?
That shouldn't be a problem, libata default DMA mask is 32 bits (which
isn't overridden with this controller) and so the block layer will
bounce any data being read/written above that point with IOMMU or
swiotlb. The comment is a bit unnecessarily scary.
--
Robert Hancock Saskatoon, SK, Canada
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Home Page: http://www.roberthancock.com/
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