drm/nouveau/pci: set streaming DMA mask early

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Some subdevices (i.e., fb/nv50.c and fb/gf100.c) map a scratch page using
dma_map_page() way before the TTM layer has had a chance to set the DMA
mask. This may prevent the driver from loading at all on platforms whose
system memory is not covered by the default DMA mask of 32-bit (i.e., when
all RAM is above 4 GB).

So set a preliminary DMA mask right after constructing the PCI device, and
base it on the .dma_bits member of the MMU subdevice, which is what the TTM
layer will base the DMA mask on as well.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

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Ard Biesheuvel 2016-10-06 16:49:28 +01:00 • committed by Ben Skeggs

parent bbe1f94a8b

commit 38f5359354

1 changed files with 27 additions and 10 deletions

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drivers/gpu/drm/nouveau/nvkm/engine/device/pci.c

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