diff options
Diffstat (limited to 'drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c')
| -rw-r--r-- | drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c index 86887c1496f8..6acdeebabfc0 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c @@ -80,6 +80,29 @@ uint64_t amdgpu_gmc_pd_addr(struct amdgpu_bo *bo) } /** + * 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 * * @adev: amdgpu device structure holding all necessary informations |