[media] vmalloc_sg: make sure all pages in vmalloc area are really DMA-ready

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Patch originally written by Konrad. Rebased on current linux media tree.

Under Xen, vmalloc_32() isn't guaranteed to return pages which are really
under 4G in machine physical addresses (only in virtual pseudo-physical
addresses).  To work around this, implement a vmalloc variant which
allocates each page with dma_alloc_coherent() to guarantee that each
page is suitable for the device in question.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: James Harper <james.harper@ejbdigital.com.au>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

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James Harper 2014-06-12 06:53:38 -03:00 • committed by Mauro Carvalho Chehab

parent b601fe5688

commit 7b4eeed174

2 changed files with 61 additions and 4 deletions

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62

drivers/media/v4l2-core/videobuf-dma-sg.c

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3

include/media/videobuf-dma-sg.h

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