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drm/amdgpu: use the AGP aperture for system memory access v2

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Start to use the old AGP aperture for system memory access.

v2: Move that to amdgpu_ttm_alloc_gart

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Junwei Zhang <Jerry.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Christian König
2018-08-27 18:19:48 +02:00
committed by Alex Deucher
parent d76364fc7f
commit 485fc361d3
3 changed files with 57 additions and 25 deletions
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23
drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c
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@@ -79,6 +79,29 @@ uint64_t amdgpu_gmc_pd_addr(struct amdgpu_bo *bo)
return pd_addr;
}
/**
* amdgpu_gmc_agp_addr - return the address in the AGP address space
*
* @tbo: TTM BO which needs the address, must be in GTT domain
*
* Tries to figure out how to access the BO through the AGP aperture. Returns
* AMDGPU_BO_INVALID_OFFSET if that is not possible.
*/
uint64_t amdgpu_gmc_agp_addr(struct ttm_buffer_object *bo)
{
struct amdgpu_device *adev = amdgpu_ttm_adev(bo->bdev);
struct ttm_dma_tt *ttm;
if (bo->num_pages != 1 || bo->ttm->caching_state == tt_cached)
return AMDGPU_BO_INVALID_OFFSET;
ttm = container_of(bo->ttm, struct ttm_dma_tt, ttm);
if (ttm->dma_address[0] + PAGE_SIZE >= adev->gmc.agp_size)
return AMDGPU_BO_INVALID_OFFSET;
return adev->gmc.agp_start + ttm->dma_address[0];
}
/**
* amdgpu_gmc_vram_location - try to find VRAM location
*