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 struct page *dummy_page = adev->mman.bdev.glob->dummy_read_page;
73 if (adev->dummy_page_addr)
75 adev->dummy_page_addr = pci_map_page(adev->pdev, dummy_page, 0,
76 PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
77 if (pci_dma_mapping_error(adev->pdev, adev->dummy_page_addr)) {
78 dev_err(&adev->pdev->dev, "Failed to DMA MAP the dummy page\n");
79 adev->dummy_page_addr = 0;
86 * amdgpu_dummy_page_fini - free dummy page used by the driver
88 * @adev: amdgpu_device pointer
90 * Frees the dummy page used by the driver (all asics).
92 static void amdgpu_gart_dummy_page_fini(struct amdgpu_device *adev)
94 if (!adev->dummy_page_addr)
96 pci_unmap_page(adev->pdev, adev->dummy_page_addr,
97 PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
98 adev->dummy_page_addr = 0;
102 * amdgpu_gart_table_vram_alloc - allocate vram for gart page table
104 * @adev: amdgpu_device pointer
106 * Allocate video memory for GART page table
107 * (pcie r4xx, r5xx+). These asics require the
108 * gart table to be in video memory.
109 * Returns 0 for success, error for failure.
111 int amdgpu_gart_table_vram_alloc(struct amdgpu_device *adev)
115 if (adev->gart.robj == NULL) {
116 struct amdgpu_bo_param bp;
118 memset(&bp, 0, sizeof(bp));
119 bp.size = adev->gart.table_size;
120 bp.byte_align = PAGE_SIZE;
121 bp.domain = AMDGPU_GEM_DOMAIN_VRAM;
122 bp.flags = AMDGPU_GEM_CREATE_CPU_ACCESS_REQUIRED |
123 AMDGPU_GEM_CREATE_VRAM_CONTIGUOUS;
124 bp.type = ttm_bo_type_kernel;
126 r = amdgpu_bo_create(adev, &bp, &adev->gart.robj);
135 * amdgpu_gart_table_vram_pin - pin gart page table in vram
137 * @adev: amdgpu_device pointer
139 * Pin the GART page table in vram so it will not be moved
140 * by the memory manager (pcie r4xx, r5xx+). These asics require the
141 * gart table to be in video memory.
142 * Returns 0 for success, error for failure.
144 int amdgpu_gart_table_vram_pin(struct amdgpu_device *adev)
149 r = amdgpu_bo_reserve(adev->gart.robj, false);
150 if (unlikely(r != 0))
152 r = amdgpu_bo_pin(adev->gart.robj,
153 AMDGPU_GEM_DOMAIN_VRAM, &gpu_addr);
155 amdgpu_bo_unreserve(adev->gart.robj);
158 r = amdgpu_bo_kmap(adev->gart.robj, &adev->gart.ptr);
160 amdgpu_bo_unpin(adev->gart.robj);
161 amdgpu_bo_unreserve(adev->gart.robj);
162 adev->gart.table_addr = gpu_addr;
167 * amdgpu_gart_table_vram_unpin - unpin gart page table in vram
169 * @adev: amdgpu_device pointer
171 * Unpin the GART page table in vram (pcie r4xx, r5xx+).
172 * These asics require the gart table to be in video memory.
174 void amdgpu_gart_table_vram_unpin(struct amdgpu_device *adev)
178 if (adev->gart.robj == NULL) {
181 r = amdgpu_bo_reserve(adev->gart.robj, true);
182 if (likely(r == 0)) {
183 amdgpu_bo_kunmap(adev->gart.robj);
184 amdgpu_bo_unpin(adev->gart.robj);
185 amdgpu_bo_unreserve(adev->gart.robj);
186 adev->gart.ptr = NULL;
191 * amdgpu_gart_table_vram_free - free gart page table vram
193 * @adev: amdgpu_device pointer
195 * Free the video memory used for the GART page table
196 * (pcie r4xx, r5xx+). These asics require the gart table to
197 * be in video memory.
199 void amdgpu_gart_table_vram_free(struct amdgpu_device *adev)
201 if (adev->gart.robj == NULL) {
204 amdgpu_bo_unref(&adev->gart.robj);
208 * Common gart functions.
211 * amdgpu_gart_unbind - unbind pages from the gart page table
213 * @adev: amdgpu_device pointer
214 * @offset: offset into the GPU's gart aperture
215 * @pages: number of pages to unbind
217 * Unbinds the requested pages from the gart page table and
218 * replaces them with the dummy page (all asics).
219 * Returns 0 for success, -EINVAL for failure.
221 int amdgpu_gart_unbind(struct amdgpu_device *adev, uint64_t offset,
228 /* Starting from VEGA10, system bit must be 0 to mean invalid. */
231 if (!adev->gart.ready) {
232 WARN(1, "trying to unbind memory from uninitialized GART !\n");
236 t = offset / AMDGPU_GPU_PAGE_SIZE;
237 p = t / (PAGE_SIZE / AMDGPU_GPU_PAGE_SIZE);
238 for (i = 0; i < pages; i++, p++) {
239 #ifdef CONFIG_DRM_AMDGPU_GART_DEBUGFS
240 adev->gart.pages[p] = NULL;
242 page_base = adev->dummy_page_addr;
246 for (j = 0; j < (PAGE_SIZE / AMDGPU_GPU_PAGE_SIZE); j++, t++) {
247 amdgpu_gmc_set_pte_pde(adev, adev->gart.ptr,
248 t, page_base, flags);
249 page_base += AMDGPU_GPU_PAGE_SIZE;
253 amdgpu_asic_flush_hdp(adev, NULL);
254 amdgpu_gmc_flush_gpu_tlb(adev, 0);
259 * amdgpu_gart_map - map dma_addresses into GART entries
261 * @adev: amdgpu_device pointer
262 * @offset: offset into the GPU's gart aperture
263 * @pages: number of pages to bind
264 * @dma_addr: DMA addresses of pages
266 * Map the dma_addresses into GART entries (all asics).
267 * Returns 0 for success, -EINVAL for failure.
269 int amdgpu_gart_map(struct amdgpu_device *adev, uint64_t offset,
270 int pages, dma_addr_t *dma_addr, uint64_t flags,
276 if (!adev->gart.ready) {
277 WARN(1, "trying to bind memory to uninitialized GART !\n");
281 t = offset / AMDGPU_GPU_PAGE_SIZE;
283 for (i = 0; i < pages; i++) {
284 page_base = dma_addr[i];
285 for (j = 0; j < (PAGE_SIZE / AMDGPU_GPU_PAGE_SIZE); j++, t++) {
286 amdgpu_gmc_set_pte_pde(adev, dst, t, page_base, flags);
287 page_base += AMDGPU_GPU_PAGE_SIZE;
294 * amdgpu_gart_bind - bind pages into the gart page table
296 * @adev: amdgpu_device pointer
297 * @offset: offset into the GPU's gart aperture
298 * @pages: number of pages to bind
299 * @pagelist: pages to bind
300 * @dma_addr: DMA addresses of pages
302 * Binds the requested pages to the gart page table
304 * Returns 0 for success, -EINVAL for failure.
306 int amdgpu_gart_bind(struct amdgpu_device *adev, uint64_t offset,
307 int pages, struct page **pagelist, dma_addr_t *dma_addr,
310 #ifdef CONFIG_DRM_AMDGPU_GART_DEBUGFS
315 if (!adev->gart.ready) {
316 WARN(1, "trying to bind memory to uninitialized GART !\n");
320 #ifdef CONFIG_DRM_AMDGPU_GART_DEBUGFS
321 t = offset / AMDGPU_GPU_PAGE_SIZE;
322 p = t / (PAGE_SIZE / AMDGPU_GPU_PAGE_SIZE);
323 for (i = 0; i < pages; i++, p++)
324 adev->gart.pages[p] = pagelist ? pagelist[i] : NULL;
330 r = amdgpu_gart_map(adev, offset, pages, dma_addr, flags,
336 amdgpu_asic_flush_hdp(adev, NULL);
337 amdgpu_gmc_flush_gpu_tlb(adev, 0);
342 * amdgpu_gart_init - init the driver info for managing the gart
344 * @adev: amdgpu_device pointer
346 * Allocate the dummy page and init the gart driver info (all asics).
347 * Returns 0 for success, error for failure.
349 int amdgpu_gart_init(struct amdgpu_device *adev)
353 if (adev->dummy_page_addr)
356 /* We need PAGE_SIZE >= AMDGPU_GPU_PAGE_SIZE */
357 if (PAGE_SIZE < AMDGPU_GPU_PAGE_SIZE) {
358 DRM_ERROR("Page size is smaller than GPU page size!\n");
361 r = amdgpu_gart_dummy_page_init(adev);
364 /* Compute table size */
365 adev->gart.num_cpu_pages = adev->gmc.gart_size / PAGE_SIZE;
366 adev->gart.num_gpu_pages = adev->gmc.gart_size / AMDGPU_GPU_PAGE_SIZE;
367 DRM_INFO("GART: num cpu pages %u, num gpu pages %u\n",
368 adev->gart.num_cpu_pages, adev->gart.num_gpu_pages);
370 #ifdef CONFIG_DRM_AMDGPU_GART_DEBUGFS
371 /* Allocate pages table */
372 adev->gart.pages = vzalloc(sizeof(void *) * adev->gart.num_cpu_pages);
373 if (adev->gart.pages == NULL)
381 * amdgpu_gart_fini - tear down the driver info for managing the gart
383 * @adev: amdgpu_device pointer
385 * Tear down the gart driver info and free the dummy page (all asics).
387 void amdgpu_gart_fini(struct amdgpu_device *adev)
389 #ifdef CONFIG_DRM_AMDGPU_GART_DEBUGFS
390 vfree(adev->gart.pages);
391 adev->gart.pages = NULL;
393 amdgpu_gart_dummy_page_fini(adev);