2010/4/27 Michel Dänzer <mic...@daenzer.net>:
> [ Moving to the new list ]
>
> On Die, 2010-04-27 at 12:34 +1000, Dave Airlie wrote:
>> From: Dave Airlie <airl...@redhat.com>
>>
>> On constrained r100 systems compiz would fail to start due to a lack
>> of memory, we can just fallback place the objects rather than completely
>> failing it works a lot better.
>>
>> v2:
>> fixes issue identified by Michel when pinning could happen in a busy
>> placement domain.
>
> [...]
>
>
>> diff --git a/drivers/gpu/drm/radeon/radeon_object.c
>> b/drivers/gpu/drm/radeon/radeon_object.c
>> index 6a8617b..ab3bc7b 100644
>> --- a/drivers/gpu/drm/radeon/radeon_object.c
>> +++ b/drivers/gpu/drm/radeon/radeon_object.c
>> @@ -64,17 +64,21 @@ bool radeon_ttm_bo_is_radeon_bo(struct ttm_buffer_object
>> *bo)
>> return false;
>> }
>>
>> -void radeon_ttm_placement_from_domain(struct radeon_bo *rbo, u32 domain)
>> +void radeon_ttm_placement_from_domain(struct radeon_bo *rbo, u32 domain,
>> bool pinned)
>> {
>> - u32 c = 0;
>> + u32 c = 0, b = 0;
>>
>> rbo->placement.fpfn = 0;
>> rbo->placement.lpfn = 0;
>> rbo->placement.placement = rbo->placements;
>> - rbo->placement.busy_placement = rbo->placements;
>> + rbo->placement.busy_placement = rbo->busy_placements;
>> if (domain & RADEON_GEM_DOMAIN_VRAM)
>> rbo->placements[c++] = TTM_PL_FLAG_WC | TTM_PL_FLAG_UNCACHED |
>> TTM_PL_FLAG_VRAM;
>> + /* add busy placement to TTM if VRAM is only option */
>> + if (domain == RADEON_GEM_DOMAIN_VRAM && pinned == false) {
>> + rbo->busy_placements[b++] = TTM_PL_MASK_CACHING |
>> TTM_PL_FLAG_TT;
>> + }
>> if (domain & RADEON_GEM_DOMAIN_GTT)
>> rbo->placements[c++] = TTM_PL_MASK_CACHING | TTM_PL_FLAG_TT;
>> if (domain & RADEON_GEM_DOMAIN_CPU)
>> @@ -82,7 +86,7 @@ void radeon_ttm_placement_from_domain(struct radeon_bo
>> *rbo, u32 domain)
>> if (!c)
>> rbo->placements[c++] = TTM_PL_MASK_CACHING |
>> TTM_PL_FLAG_SYSTEM;
>> rbo->placement.num_placement = c;
>> - rbo->placement.num_busy_placement = c;
>> + rbo->placement.num_busy_placement = b;
>> }
>>
>> int radeon_bo_create(struct radeon_device *rdev, struct drm_gem_object
>> *gobj,
>
> BTW, this means there won't be any busy placements if (domain !=
> RADEON_GEM_DOMAIN_VRAM || pinned). Not sure if that's a problem.
>
Well there isn't really anywhere else to put things, I don't think
falling GTT back to VRAM will ever be a case we have to worry about as
much, its not like should be pinning anything major in GTT especially
in the middle.
Falling back to system placement would sort of suck since the GPU
can't access it.
Dave.
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