39  * GART
40  * The GART (Graphics Aperture Remapping Table) is an aperture
46  * Radeon GPUs support both an internal GART, as described above,
47  * and AGP.  AGP works similarly, but the GART table is configured
52  * Both AGP and internal GART can be used at the same time, however
55  * This file handles the common internal GART management.
59  * Common GART table functions.
68  * This dummy page is used by the driver as a filler for gart entries
69  * when pages are taken out of the GART
105  * amdgpu_gart_table_vram_alloc - allocate vram for gart page table
109  * Allocate video memory for GART page table
111  * gart table to be in video memory.
118 	if (adev->gart.bo == NULL) {  in amdgpu_gart_table_vram_alloc()
122 		bp.size = adev->gart.table_size;  in amdgpu_gart_table_vram_alloc()
131 		r = amdgpu_bo_create(adev, &bp, &adev->gart.bo);  in amdgpu_gart_table_vram_alloc()
140  * amdgpu_gart_table_vram_pin - pin gart page table in vram
144  * Pin the GART page table in vram so it will not be moved
146  * gart table to be in video memory.
153 	r = amdgpu_bo_reserve(adev->gart.bo, false);  in amdgpu_gart_table_vram_pin()
156 	r = amdgpu_bo_pin(adev->gart.bo, AMDGPU_GEM_DOMAIN_VRAM);  in amdgpu_gart_table_vram_pin()
158 		amdgpu_bo_unreserve(adev->gart.bo);  in amdgpu_gart_table_vram_pin()
161 	r = amdgpu_bo_kmap(adev->gart.bo, &adev->gart.ptr);  in amdgpu_gart_table_vram_pin()
163 		amdgpu_bo_unpin(adev->gart.bo);  in amdgpu_gart_table_vram_pin()
164 	amdgpu_bo_unreserve(adev->gart.bo);  in amdgpu_gart_table_vram_pin()
169  * amdgpu_gart_table_vram_unpin - unpin gart page table in vram
173  * Unpin the GART page table in vram (pcie r4xx, r5xx+).
174  * These asics require the gart table to be in video memory.
180 	if (adev->gart.bo == NULL) {  in amdgpu_gart_table_vram_unpin()
183 	r = amdgpu_bo_reserve(adev->gart.bo, true);  in amdgpu_gart_table_vram_unpin()
185 		amdgpu_bo_kunmap(adev->gart.bo);  in amdgpu_gart_table_vram_unpin()
186 		amdgpu_bo_unpin(adev->gart.bo);  in amdgpu_gart_table_vram_unpin()
187 		amdgpu_bo_unreserve(adev->gart.bo);  in amdgpu_gart_table_vram_unpin()
188 		adev->gart.ptr = NULL;  in amdgpu_gart_table_vram_unpin()
193  * amdgpu_gart_table_vram_free - free gart page table vram
197  * Free the video memory used for the GART page table
198  * (pcie r4xx, r5xx+).  These asics require the gart table to
203 	if (adev->gart.bo == NULL) {  in amdgpu_gart_table_vram_free()
206 	amdgpu_bo_unref(&adev->gart.bo);  in amdgpu_gart_table_vram_free()
207 	adev->gart.ptr = NULL;  in amdgpu_gart_table_vram_free()
211  * Common gart functions.
214  * amdgpu_gart_unbind - unbind pages from the gart page table
217  * @offset: offset into the GPU's gart aperture
220  * Unbinds the requested pages from the gart page table and
234 	if (!adev->gart.ready) {  in amdgpu_gart_unbind()
235 		WARN(1, "trying to unbind memory from uninitialized GART !\n");  in amdgpu_gart_unbind()
243 		if (!adev->gart.ptr)  in amdgpu_gart_unbind()
247 			amdgpu_gmc_set_pte_pde(adev, adev->gart.ptr,  in amdgpu_gart_unbind()
261  * amdgpu_gart_map - map dma_addresses into GART entries
264  * @offset: offset into the GPU's gart aperture
268  * @dst: CPU address of the gart table
270  * Map the dma_addresses into GART entries (all asics).
280 	if (!adev->gart.ready) {  in amdgpu_gart_map()
281 		WARN(1, "trying to bind memory to uninitialized GART !\n");  in amdgpu_gart_map()
298  * amdgpu_gart_bind - bind pages into the gart page table
301  * @offset: offset into the GPU's gart aperture
306  * Binds the requested pages to the gart page table
314 	if (!adev->gart.ready) {  in amdgpu_gart_bind()
315 		WARN(1, "trying to bind memory to uninitialized GART !\n");  in amdgpu_gart_bind()
319 	if (!adev->gart.ptr)  in amdgpu_gart_bind()
323 			       adev->gart.ptr);  in amdgpu_gart_bind()
327  * amdgpu_gart_invalidate_tlb - invalidate gart TLB
331  * Invalidate gart TLB which can be use as a way to flush gart changes
345  * amdgpu_gart_init - init the driver info for managing the gart
349  * Allocate the dummy page and init the gart driver info (all asics).
368 	adev->gart.num_cpu_pages = adev->gmc.gart_size / PAGE_SIZE;  in amdgpu_gart_init()
369 	adev->gart.num_gpu_pages = adev->gmc.gart_size / AMDGPU_GPU_PAGE_SIZE;  in amdgpu_gart_init()
370 	DRM_INFO("GART: num cpu pages %u, num gpu pages %u\n",  in amdgpu_gart_init()
371 		 adev->gart.num_cpu_pages, adev->gart.num_gpu_pages);  in amdgpu_gart_init()