| commit | bc5c96748a5f2067193faa8131b2aa5f9775d309 | |
| author | Christoph Hellwig <hch@infradead.org> | |
| Sat, 2 Apr 2011 12:15:04 +0000 (2 08:15 -0400) | ||
| committer | Dan Williams <dan.j.williams@intel.com> | |
| Sun, 3 Jul 2011 11:00:37 +0000 (3 04:00 -0700) | ||
| tree | 509dc1a4e1cd2859f9c521af6c41b0a955226bc2 | treesnapshot (tar.gz zip) |
| parent | 524b5f723be8a1d966c1285d69810bc461f181c2 | commitdiff |
isci: simplify dma coherent allocation
Remove the insane infrastructure for preallocating coheren DMA regions,
and just allocate the memory where needed. This also gets rid of the
aligment adjustments given that Documentation/DMA-API-HOWTO.txt sais:
"The cpu return address and the DMA bus master address are both
guaranteed to be aligned to the smallest PAGE_SIZE order which
is greater than or equal to the requested size. This invariant
exists (for example) to guarantee that if you allocate a chunk
which is smaller than or equal to 64 kilobytes, the extent of the
buffer you receive will not cross a 64K boundary."
Signed-off-by: Christoph Hellwig <hch@lst.de>
[djbw: moved allocation from start to init, re-add memset]
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Remove the insane infrastructure for preallocating coheren DMA regions,
and just allocate the memory where needed. This also gets rid of the
aligment adjustments given that Documentation/DMA-API-HOWTO.txt sais:
"The cpu return address and the DMA bus master address are both
guaranteed to be aligned to the smallest PAGE_SIZE order which
is greater than or equal to the requested size. This invariant
exists (for example) to guarantee that if you allocate a chunk
which is smaller than or equal to 64 kilobytes, the extent of the
buffer you receive will not cross a 64K boundary."
Signed-off-by: Christoph Hellwig <hch@lst.de>
[djbw: moved allocation from start to init, re-add memset]
Signed-off-by: Dan Williams <dan.j.williams@intel.com>