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

[Alex Deucher]

On Tue, Jul 29, 2014 at 5:54 AM, Christian König
<deathsimple at vodafone.de> wrote:
> 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>

Applied to my 3.17 tree.

Thanks.

>
>
>> ---
>>   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);
>
>
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