[PATCH 1/3] drm/radeon: Use write-combined CPU mappings of ring buffers with PCIe

[Christian König]

Am 29.07.2014 um 11:47 schrieb Michel Dänzer:
> From: Michel Dänzer <michel.daenzer at amd.com>
>
> PCI GART doesn't support unsnooped access. AGP GART already uses
> write-combined CPU mappings.
>
> Signed-off-by: Michel Dänzer <michel.daenzer at amd.com>

For this series Reviewed-by: Christian König <christian.koenig at amd.com>

> ---
>   drivers/gpu/drm/radeon/radeon_ring.c | 4 +++-
>   1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/radeon/radeon_ring.c b/drivers/gpu/drm/radeon/radeon_ring.c
> index 71439f0..7cfea7e 100644
> --- a/drivers/gpu/drm/radeon/radeon_ring.c
> +++ b/drivers/gpu/drm/radeon/radeon_ring.c
> @@ -640,7 +640,9 @@ int radeon_ring_init(struct radeon_device *rdev, struct radeon_ring *ring, unsig
>   	/* Allocate ring buffer */
>   	if (ring->ring_obj == NULL) {
>   		r = radeon_bo_create(rdev, ring->ring_size, PAGE_SIZE, true,
> -				     RADEON_GEM_DOMAIN_GTT, 0,
> +				     RADEON_GEM_DOMAIN_GTT,
> +				     (rdev->flags & RADEON_IS_PCIE) ?
> +				     RADEON_GEM_GTT_WC : 0,
>   				     NULL, &ring->ring_obj);
>   		if (r) {
>   			dev_err(rdev->dev, "(%d) ring create failed\n", r);