linux/drivers/gpu
Konrad Rzeszutek Wilk 69a07f0b11 ttm: Utilize the DMA API for pages that have TTM_PAGE_FLAG_DMA32 set.
For pages that have the TTM_PAGE_FLAG_DMA32 flag set we
use the DMA API. We save the bus address in our array which we
use to program the GART (see "radeon/ttm/PCIe: Use dma_addr if TTM
has set it." and "nouveau/ttm/PCIe: Use dma_addr if TTM has set it.").

The reason behind using the DMA API is that under Xen we would
end up programming the GART with the bounce buffer (SWIOTLB)
DMA address instead of the physical DMA address of the TTM page.
The reason being that alloc_page with GFP_DMA32 does not allocate
pages under the the 4GB mark when running under Xen hypervisor.

Under baremetal this means we do the DMA API call earlier instead
of when we program the GART.

For details please refer to:
https://lkml.org/lkml/2011/1/7/251

[v2: Fixed indentation, revised desc, added Reviewed-by]
Reviewed-by: Thomas Hellstrom <thomas@shipmail.org>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Tested-by: Ian Campbell <ian.campbell@citrix.com>
2011-01-27 16:03:09 -05:00
..
drm ttm: Utilize the DMA API for pages that have TTM_PAGE_FLAG_DMA32 set. 2011-01-27 16:03:09 -05:00
stub drm/stub/Kconfig: fix Kconfig for stub driver. 2010-11-09 13:33:00 +10:00
vga Merge branch 'llseek' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/bkl 2010-10-22 10:52:56 -07:00
Makefile gpu: Add Intel GMA500(Poulsbo) Stub Driver 2010-10-26 11:00:13 +10:00