2 * Copyright 2008 Advanced Micro Devices, Inc.
3 * Copyright 2008 Red Hat Inc.
4 * Copyright 2009 Jerome Glisse.
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the "Software"),
8 * to deal in the Software without restriction, including without limitation
9 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10 * and/or sell copies of the Software, and to permit persons to whom the
11 * Software is furnished to do so, subject to the following conditions:
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
20 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
21 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
22 * OTHER DEALINGS IN THE SOFTWARE.
24 * Authors: Dave Airlie
29 #include <drm/amdgpu_drm.h>
34 * The GART (Graphics Aperture Remapping Table) is an aperture
35 * in the GPU's address space. System pages can be mapped into
36 * the aperture and look like contiguous pages from the GPU's
37 * perspective. A page table maps the pages in the aperture
38 * to the actual backing pages in system memory.
40 * Radeon GPUs support both an internal GART, as described above,
41 * and AGP. AGP works similarly, but the GART table is configured
42 * and maintained by the northbridge rather than the driver.
43 * Radeon hw has a separate AGP aperture that is programmed to
44 * point to the AGP aperture provided by the northbridge and the
45 * requests are passed through to the northbridge aperture.
46 * Both AGP and internal GART can be used at the same time, however
47 * that is not currently supported by the driver.
49 * This file handles the common internal GART management.
53 * Common GART table functions.
56 * amdgpu_gart_table_ram_alloc - allocate system ram for gart page table
58 * @adev: amdgpu_device pointer
60 * Allocate system memory for GART page table
61 * (r1xx-r3xx, non-pcie r4xx, rs400). These asics require the
62 * gart table to be in system memory.
63 * Returns 0 for success, -ENOMEM for failure.
65 int amdgpu_gart_table_ram_alloc(struct amdgpu_device *adev)
69 ptr = pci_alloc_consistent(adev->pdev, adev->gart.table_size,
70 &adev->gart.table_addr);
76 set_memory_uc((unsigned long)ptr,
77 adev->gart.table_size >> PAGE_SHIFT);
81 memset((void *)adev->gart.ptr, 0, adev->gart.table_size);
86 * amdgpu_gart_table_ram_free - free system ram for gart page table
88 * @adev: amdgpu_device pointer
90 * Free system memory for GART page table
91 * (r1xx-r3xx, non-pcie r4xx, rs400). These asics require the
92 * gart table to be in system memory.
94 void amdgpu_gart_table_ram_free(struct amdgpu_device *adev)
96 if (adev->gart.ptr == NULL) {
101 set_memory_wb((unsigned long)adev->gart.ptr,
102 adev->gart.table_size >> PAGE_SHIFT);
105 pci_free_consistent(adev->pdev, adev->gart.table_size,
106 (void *)adev->gart.ptr,
107 adev->gart.table_addr);
108 adev->gart.ptr = NULL;
109 adev->gart.table_addr = 0;
113 * amdgpu_gart_table_vram_alloc - allocate vram for gart page table
115 * @adev: amdgpu_device pointer
117 * Allocate video memory for GART page table
118 * (pcie r4xx, r5xx+). These asics require the
119 * gart table to be in video memory.
120 * Returns 0 for success, error for failure.
122 int amdgpu_gart_table_vram_alloc(struct amdgpu_device *adev)
126 if (adev->gart.robj == NULL) {
127 r = amdgpu_bo_create(adev, adev->gart.table_size,
128 PAGE_SIZE, true, AMDGPU_GEM_DOMAIN_VRAM,
129 AMDGPU_GEM_CREATE_CPU_ACCESS_REQUIRED,
130 NULL, NULL, &adev->gart.robj);
139 * amdgpu_gart_table_vram_pin - pin gart page table in vram
141 * @adev: amdgpu_device pointer
143 * Pin the GART page table in vram so it will not be moved
144 * by the memory manager (pcie r4xx, r5xx+). These asics require the
145 * gart table to be in video memory.
146 * Returns 0 for success, error for failure.
148 int amdgpu_gart_table_vram_pin(struct amdgpu_device *adev)
153 r = amdgpu_bo_reserve(adev->gart.robj, false);
154 if (unlikely(r != 0))
156 r = amdgpu_bo_pin(adev->gart.robj,
157 AMDGPU_GEM_DOMAIN_VRAM, &gpu_addr);
159 amdgpu_bo_unreserve(adev->gart.robj);
162 r = amdgpu_bo_kmap(adev->gart.robj, &adev->gart.ptr);
164 amdgpu_bo_unpin(adev->gart.robj);
165 amdgpu_bo_unreserve(adev->gart.robj);
166 adev->gart.table_addr = gpu_addr;
171 * amdgpu_gart_table_vram_unpin - unpin gart page table in vram
173 * @adev: amdgpu_device pointer
175 * Unpin the GART page table in vram (pcie r4xx, r5xx+).
176 * These asics require the gart table to be in video memory.
178 void amdgpu_gart_table_vram_unpin(struct amdgpu_device *adev)
182 if (adev->gart.robj == NULL) {
185 r = amdgpu_bo_reserve(adev->gart.robj, false);
186 if (likely(r == 0)) {
187 amdgpu_bo_kunmap(adev->gart.robj);
188 amdgpu_bo_unpin(adev->gart.robj);
189 amdgpu_bo_unreserve(adev->gart.robj);
190 adev->gart.ptr = NULL;
195 * amdgpu_gart_table_vram_free - free gart page table vram
197 * @adev: amdgpu_device pointer
199 * Free the video memory used for the GART page table
200 * (pcie r4xx, r5xx+). These asics require the gart table to
201 * be in video memory.
203 void amdgpu_gart_table_vram_free(struct amdgpu_device *adev)
205 if (adev->gart.robj == NULL) {
208 amdgpu_bo_unref(&adev->gart.robj);
212 * Common gart functions.
215 * amdgpu_gart_unbind - unbind pages from the gart page table
217 * @adev: amdgpu_device pointer
218 * @offset: offset into the GPU's gart aperture
219 * @pages: number of pages to unbind
221 * Unbinds the requested pages from the gart page table and
222 * replaces them with the dummy page (all asics).
224 void amdgpu_gart_unbind(struct amdgpu_device *adev, uint64_t offset,
231 uint32_t flags = AMDGPU_PTE_SYSTEM;
233 if (!adev->gart.ready) {
234 WARN(1, "trying to unbind memory from uninitialized GART !\n");
238 t = offset / AMDGPU_GPU_PAGE_SIZE;
239 p = t / (PAGE_SIZE / AMDGPU_GPU_PAGE_SIZE);
240 for (i = 0; i < pages; i++, p++) {
241 #ifdef CONFIG_DRM_AMDGPU_GART_DEBUGFS
242 adev->gart.pages[p] = NULL;
244 page_base = adev->dummy_page.addr;
248 for (j = 0; j < (PAGE_SIZE / AMDGPU_GPU_PAGE_SIZE); j++, t++) {
249 amdgpu_gart_set_pte_pde(adev, adev->gart.ptr,
250 t, page_base, flags);
251 page_base += AMDGPU_GPU_PAGE_SIZE;
255 amdgpu_gart_flush_gpu_tlb(adev, 0);
259 * amdgpu_gart_bind - bind pages into the gart page table
261 * @adev: amdgpu_device pointer
262 * @offset: offset into the GPU's gart aperture
263 * @pages: number of pages to bind
264 * @pagelist: pages to bind
265 * @dma_addr: DMA addresses of pages
267 * Binds the requested pages to the gart page table
269 * Returns 0 for success, -EINVAL for failure.
271 int amdgpu_gart_bind(struct amdgpu_device *adev, uint64_t offset,
272 int pages, struct page **pagelist, dma_addr_t *dma_addr,
280 if (!adev->gart.ready) {
281 WARN(1, "trying to bind memory to uninitialized GART !\n");
285 t = offset / AMDGPU_GPU_PAGE_SIZE;
286 p = t / (PAGE_SIZE / AMDGPU_GPU_PAGE_SIZE);
288 for (i = 0; i < pages; i++, p++) {
289 #ifdef CONFIG_DRM_AMDGPU_GART_DEBUGFS
290 adev->gart.pages[p] = pagelist[i];
292 if (adev->gart.ptr) {
293 page_base = dma_addr[i];
294 for (j = 0; j < (PAGE_SIZE / AMDGPU_GPU_PAGE_SIZE); j++, t++) {
295 amdgpu_gart_set_pte_pde(adev, adev->gart.ptr, t, page_base, flags);
296 page_base += AMDGPU_GPU_PAGE_SIZE;
301 amdgpu_gart_flush_gpu_tlb(adev, 0);
306 * amdgpu_gart_init - init the driver info for managing the gart
308 * @adev: amdgpu_device pointer
310 * Allocate the dummy page and init the gart driver info (all asics).
311 * Returns 0 for success, error for failure.
313 int amdgpu_gart_init(struct amdgpu_device *adev)
317 if (adev->dummy_page.page)
320 /* We need PAGE_SIZE >= AMDGPU_GPU_PAGE_SIZE */
321 if (PAGE_SIZE < AMDGPU_GPU_PAGE_SIZE) {
322 DRM_ERROR("Page size is smaller than GPU page size!\n");
325 r = amdgpu_dummy_page_init(adev);
328 /* Compute table size */
329 adev->gart.num_cpu_pages = adev->mc.gtt_size / PAGE_SIZE;
330 adev->gart.num_gpu_pages = adev->mc.gtt_size / AMDGPU_GPU_PAGE_SIZE;
331 DRM_INFO("GART: num cpu pages %u, num gpu pages %u\n",
332 adev->gart.num_cpu_pages, adev->gart.num_gpu_pages);
334 #ifdef CONFIG_DRM_AMDGPU_GART_DEBUGFS
335 /* Allocate pages table */
336 adev->gart.pages = vzalloc(sizeof(void *) * adev->gart.num_cpu_pages);
337 if (adev->gart.pages == NULL) {
338 amdgpu_gart_fini(adev);
347 * amdgpu_gart_fini - tear down the driver info for managing the gart
349 * @adev: amdgpu_device pointer
351 * Tear down the gart driver info and free the dummy page (all asics).
353 void amdgpu_gart_fini(struct amdgpu_device *adev)
355 if (adev->gart.ready) {
357 amdgpu_gart_unbind(adev, 0, adev->gart.num_cpu_pages);
359 adev->gart.ready = false;
360 #ifdef CONFIG_DRM_AMDGPU_GART_DEBUGFS
361 vfree(adev->gart.pages);
362 adev->gart.pages = NULL;
364 amdgpu_dummy_page_fini(adev);