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>
31 #include <asm/set_memory.h>
37 * The GART (Graphics Aperture Remapping Table) is an aperture
38 * in the GPU's address space. System pages can be mapped into
39 * the aperture and look like contiguous pages from the GPU's
40 * perspective. A page table maps the pages in the aperture
41 * to the actual backing pages in system memory.
43 * Radeon GPUs support both an internal GART, as described above,
44 * and AGP. AGP works similarly, but the GART table is configured
45 * and maintained by the northbridge rather than the driver.
46 * Radeon hw has a separate AGP aperture that is programmed to
47 * point to the AGP aperture provided by the northbridge and the
48 * requests are passed through to the northbridge aperture.
49 * Both AGP and internal GART can be used at the same time, however
50 * that is not currently supported by the driver.
52 * This file handles the common internal GART management.
56 * Common GART table functions.
60 * amdgpu_dummy_page_init - init dummy page used by the driver
62 * @adev: amdgpu_device pointer
64 * Allocate the dummy page used by the driver (all asics).
65 * This dummy page is used by the driver as a filler for gart entries
66 * when pages are taken out of the GART
67 * Returns 0 on sucess, -ENOMEM on failure.
69 static int amdgpu_gart_dummy_page_init(struct amdgpu_device *adev)
71 if (adev->dummy_page.page)
73 adev->dummy_page.page = alloc_page(GFP_DMA32 | GFP_KERNEL | __GFP_ZERO);
74 if (adev->dummy_page.page == NULL)
76 adev->dummy_page.addr = pci_map_page(adev->pdev, adev->dummy_page.page,
77 0, PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
78 if (pci_dma_mapping_error(adev->pdev, adev->dummy_page.addr)) {
79 dev_err(&adev->pdev->dev, "Failed to DMA MAP the dummy page\n");
80 __free_page(adev->dummy_page.page);
81 adev->dummy_page.page = NULL;
88 * amdgpu_dummy_page_fini - free dummy page used by the driver
90 * @adev: amdgpu_device pointer
92 * Frees the dummy page used by the driver (all asics).
94 static void amdgpu_gart_dummy_page_fini(struct amdgpu_device *adev)
96 if (adev->dummy_page.page == NULL)
98 pci_unmap_page(adev->pdev, adev->dummy_page.addr,
99 PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
100 __free_page(adev->dummy_page.page);
101 adev->dummy_page.page = NULL;
105 * amdgpu_gart_table_vram_alloc - allocate vram for gart page table
107 * @adev: amdgpu_device pointer
109 * Allocate video memory for GART page table
110 * (pcie r4xx, r5xx+). These asics require the
111 * gart table to be in video memory.
112 * Returns 0 for success, error for failure.
114 int amdgpu_gart_table_vram_alloc(struct amdgpu_device *adev)
118 if (adev->gart.robj == NULL) {
119 r = amdgpu_bo_create(adev, adev->gart.table_size,
120 PAGE_SIZE, true, AMDGPU_GEM_DOMAIN_VRAM,
121 AMDGPU_GEM_CREATE_CPU_ACCESS_REQUIRED |
122 AMDGPU_GEM_CREATE_VRAM_CONTIGUOUS,
123 NULL, NULL, 0, &adev->gart.robj);
132 * amdgpu_gart_table_vram_pin - pin gart page table in vram
134 * @adev: amdgpu_device pointer
136 * Pin the GART page table in vram so it will not be moved
137 * by the memory manager (pcie r4xx, r5xx+). These asics require the
138 * gart table to be in video memory.
139 * Returns 0 for success, error for failure.
141 int amdgpu_gart_table_vram_pin(struct amdgpu_device *adev)
146 r = amdgpu_bo_reserve(adev->gart.robj, false);
147 if (unlikely(r != 0))
149 r = amdgpu_bo_pin(adev->gart.robj,
150 AMDGPU_GEM_DOMAIN_VRAM, &gpu_addr);
152 amdgpu_bo_unreserve(adev->gart.robj);
155 r = amdgpu_bo_kmap(adev->gart.robj, &adev->gart.ptr);
157 amdgpu_bo_unpin(adev->gart.robj);
158 amdgpu_bo_unreserve(adev->gart.robj);
159 adev->gart.table_addr = gpu_addr;
164 * amdgpu_gart_table_vram_unpin - unpin gart page table in vram
166 * @adev: amdgpu_device pointer
168 * Unpin the GART page table in vram (pcie r4xx, r5xx+).
169 * These asics require the gart table to be in video memory.
171 void amdgpu_gart_table_vram_unpin(struct amdgpu_device *adev)
175 if (adev->gart.robj == NULL) {
178 r = amdgpu_bo_reserve(adev->gart.robj, true);
179 if (likely(r == 0)) {
180 amdgpu_bo_kunmap(adev->gart.robj);
181 amdgpu_bo_unpin(adev->gart.robj);
182 amdgpu_bo_unreserve(adev->gart.robj);
183 adev->gart.ptr = NULL;
188 * amdgpu_gart_table_vram_free - free gart page table vram
190 * @adev: amdgpu_device pointer
192 * Free the video memory used for the GART page table
193 * (pcie r4xx, r5xx+). These asics require the gart table to
194 * be in video memory.
196 void amdgpu_gart_table_vram_free(struct amdgpu_device *adev)
198 if (adev->gart.robj == NULL) {
201 amdgpu_bo_unref(&adev->gart.robj);
205 * Common gart functions.
208 * amdgpu_gart_unbind - unbind pages from the gart page table
210 * @adev: amdgpu_device pointer
211 * @offset: offset into the GPU's gart aperture
212 * @pages: number of pages to unbind
214 * Unbinds the requested pages from the gart page table and
215 * replaces them with the dummy page (all asics).
216 * Returns 0 for success, -EINVAL for failure.
218 int amdgpu_gart_unbind(struct amdgpu_device *adev, uint64_t offset,
225 /* Starting from VEGA10, system bit must be 0 to mean invalid. */
228 if (!adev->gart.ready) {
229 WARN(1, "trying to unbind memory from uninitialized GART !\n");
233 t = offset / AMDGPU_GPU_PAGE_SIZE;
234 p = t / (PAGE_SIZE / AMDGPU_GPU_PAGE_SIZE);
235 for (i = 0; i < pages; i++, p++) {
236 #ifdef CONFIG_DRM_AMDGPU_GART_DEBUGFS
237 adev->gart.pages[p] = NULL;
239 page_base = adev->dummy_page.addr;
243 for (j = 0; j < (PAGE_SIZE / AMDGPU_GPU_PAGE_SIZE); j++, t++) {
244 amdgpu_gart_set_pte_pde(adev, adev->gart.ptr,
245 t, page_base, flags);
246 page_base += AMDGPU_GPU_PAGE_SIZE;
250 amdgpu_gart_flush_gpu_tlb(adev, 0);
255 * amdgpu_gart_map - map dma_addresses into GART entries
257 * @adev: amdgpu_device pointer
258 * @offset: offset into the GPU's gart aperture
259 * @pages: number of pages to bind
260 * @dma_addr: DMA addresses of pages
262 * Map the dma_addresses into GART entries (all asics).
263 * Returns 0 for success, -EINVAL for failure.
265 int amdgpu_gart_map(struct amdgpu_device *adev, uint64_t offset,
266 int pages, dma_addr_t *dma_addr, uint64_t flags,
272 if (!adev->gart.ready) {
273 WARN(1, "trying to bind memory to uninitialized GART !\n");
277 t = offset / AMDGPU_GPU_PAGE_SIZE;
279 for (i = 0; i < pages; i++) {
280 page_base = dma_addr[i];
281 for (j = 0; j < (PAGE_SIZE / AMDGPU_GPU_PAGE_SIZE); j++, t++) {
282 amdgpu_gart_set_pte_pde(adev, dst, t, page_base, flags);
283 page_base += AMDGPU_GPU_PAGE_SIZE;
290 * amdgpu_gart_bind - bind pages into the gart page table
292 * @adev: amdgpu_device pointer
293 * @offset: offset into the GPU's gart aperture
294 * @pages: number of pages to bind
295 * @pagelist: pages to bind
296 * @dma_addr: DMA addresses of pages
298 * Binds the requested pages to the gart page table
300 * Returns 0 for success, -EINVAL for failure.
302 int amdgpu_gart_bind(struct amdgpu_device *adev, uint64_t offset,
303 int pages, struct page **pagelist, dma_addr_t *dma_addr,
306 #ifdef CONFIG_DRM_AMDGPU_GART_DEBUGFS
311 if (!adev->gart.ready) {
312 WARN(1, "trying to bind memory to uninitialized GART !\n");
316 #ifdef CONFIG_DRM_AMDGPU_GART_DEBUGFS
317 t = offset / AMDGPU_GPU_PAGE_SIZE;
318 p = t / (PAGE_SIZE / AMDGPU_GPU_PAGE_SIZE);
319 for (i = 0; i < pages; i++, p++)
320 adev->gart.pages[p] = pagelist[i];
326 r = amdgpu_gart_map(adev, offset, pages, dma_addr, flags,
332 amdgpu_gart_flush_gpu_tlb(adev, 0);
337 * amdgpu_gart_init - init the driver info for managing the gart
339 * @adev: amdgpu_device pointer
341 * Allocate the dummy page and init the gart driver info (all asics).
342 * Returns 0 for success, error for failure.
344 int amdgpu_gart_init(struct amdgpu_device *adev)
348 if (adev->dummy_page.page)
351 /* We need PAGE_SIZE >= AMDGPU_GPU_PAGE_SIZE */
352 if (PAGE_SIZE < AMDGPU_GPU_PAGE_SIZE) {
353 DRM_ERROR("Page size is smaller than GPU page size!\n");
356 r = amdgpu_gart_dummy_page_init(adev);
359 /* Compute table size */
360 adev->gart.num_cpu_pages = adev->mc.gart_size / PAGE_SIZE;
361 adev->gart.num_gpu_pages = adev->mc.gart_size / AMDGPU_GPU_PAGE_SIZE;
362 DRM_INFO("GART: num cpu pages %u, num gpu pages %u\n",
363 adev->gart.num_cpu_pages, adev->gart.num_gpu_pages);
365 #ifdef CONFIG_DRM_AMDGPU_GART_DEBUGFS
366 /* Allocate pages table */
367 adev->gart.pages = vzalloc(sizeof(void *) * adev->gart.num_cpu_pages);
368 if (adev->gart.pages == NULL)
376 * amdgpu_gart_fini - tear down the driver info for managing the gart
378 * @adev: amdgpu_device pointer
380 * Tear down the gart driver info and free the dummy page (all asics).
382 void amdgpu_gart_fini(struct amdgpu_device *adev)
384 #ifdef CONFIG_DRM_AMDGPU_GART_DEBUGFS
385 vfree(adev->gart.pages);
386 adev->gart.pages = NULL;
388 amdgpu_gart_dummy_page_fini(adev);