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 <linux/pci.h>
30 #include <linux/vmalloc.h>
32 #include <drm/amdgpu_drm.h>
34 #include <asm/set_memory.h>
40 * The GART (Graphics Aperture Remapping Table) is an aperture
41 * in the GPU's address space. System pages can be mapped into
42 * the aperture and look like contiguous pages from the GPU's
43 * perspective. A page table maps the pages in the aperture
44 * to the actual backing pages in system memory.
46 * Radeon GPUs support both an internal GART, as described above,
47 * and AGP. AGP works similarly, but the GART table is configured
48 * and maintained by the northbridge rather than the driver.
49 * Radeon hw has a separate AGP aperture that is programmed to
50 * point to the AGP aperture provided by the northbridge and the
51 * requests are passed through to the northbridge aperture.
52 * Both AGP and internal GART can be used at the same time, however
53 * that is not currently supported by the driver.
55 * This file handles the common internal GART management.
59 * Common GART table functions.
63 * amdgpu_dummy_page_init - init dummy page used by the driver
65 * @adev: amdgpu_device pointer
67 * Allocate the dummy page used by the driver (all asics).
68 * This dummy page is used by the driver as a filler for gart entries
69 * when pages are taken out of the GART
70 * Returns 0 on sucess, -ENOMEM on failure.
72 static int amdgpu_gart_dummy_page_init(struct amdgpu_device *adev)
74 struct page *dummy_page = ttm_glob.dummy_read_page;
76 if (adev->dummy_page_addr)
78 adev->dummy_page_addr = dma_map_page(&adev->pdev->dev, dummy_page, 0,
79 PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
80 if (dma_mapping_error(&adev->pdev->dev, adev->dummy_page_addr)) {
81 dev_err(&adev->pdev->dev, "Failed to DMA MAP the dummy page\n");
82 adev->dummy_page_addr = 0;
89 * amdgpu_dummy_page_fini - free dummy page used by the driver
91 * @adev: amdgpu_device pointer
93 * Frees the dummy page used by the driver (all asics).
95 static void amdgpu_gart_dummy_page_fini(struct amdgpu_device *adev)
97 if (!adev->dummy_page_addr)
99 pci_unmap_page(adev->pdev, adev->dummy_page_addr,
100 PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
101 adev->dummy_page_addr = 0;
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.bo == NULL) {
119 struct amdgpu_bo_param bp;
121 memset(&bp, 0, sizeof(bp));
122 bp.size = adev->gart.table_size;
123 bp.byte_align = PAGE_SIZE;
124 bp.domain = AMDGPU_GEM_DOMAIN_VRAM;
125 bp.flags = AMDGPU_GEM_CREATE_CPU_ACCESS_REQUIRED |
126 AMDGPU_GEM_CREATE_VRAM_CONTIGUOUS;
127 bp.type = ttm_bo_type_kernel;
129 r = amdgpu_bo_create(adev, &bp, &adev->gart.bo);
138 * amdgpu_gart_table_vram_pin - pin gart page table in vram
140 * @adev: amdgpu_device pointer
142 * Pin the GART page table in vram so it will not be moved
143 * by the memory manager (pcie r4xx, r5xx+). These asics require the
144 * gart table to be in video memory.
145 * Returns 0 for success, error for failure.
147 int amdgpu_gart_table_vram_pin(struct amdgpu_device *adev)
151 r = amdgpu_bo_reserve(adev->gart.bo, false);
152 if (unlikely(r != 0))
154 r = amdgpu_bo_pin(adev->gart.bo, AMDGPU_GEM_DOMAIN_VRAM);
156 amdgpu_bo_unreserve(adev->gart.bo);
159 r = amdgpu_bo_kmap(adev->gart.bo, &adev->gart.ptr);
161 amdgpu_bo_unpin(adev->gart.bo);
162 amdgpu_bo_unreserve(adev->gart.bo);
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.bo == NULL) {
181 r = amdgpu_bo_reserve(adev->gart.bo, true);
182 if (likely(r == 0)) {
183 amdgpu_bo_kunmap(adev->gart.bo);
184 amdgpu_bo_unpin(adev->gart.bo);
185 amdgpu_bo_unreserve(adev->gart.bo);
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.bo == NULL) {
204 amdgpu_bo_unref(&adev->gart.bo);
205 adev->gart.ptr = NULL;
209 * Common gart functions.
212 * amdgpu_gart_unbind - unbind pages from the gart page table
214 * @adev: amdgpu_device pointer
215 * @offset: offset into the GPU's gart aperture
216 * @pages: number of pages to unbind
218 * Unbinds the requested pages from the gart page table and
219 * replaces them with the dummy page (all asics).
220 * Returns 0 for success, -EINVAL for failure.
222 int amdgpu_gart_unbind(struct amdgpu_device *adev, uint64_t offset,
229 /* Starting from VEGA10, system bit must be 0 to mean invalid. */
232 if (!adev->gart.ready) {
233 WARN(1, "trying to unbind memory from uninitialized GART !\n");
237 t = offset / AMDGPU_GPU_PAGE_SIZE;
238 p = t / AMDGPU_GPU_PAGES_IN_CPU_PAGE;
239 for (i = 0; i < pages; i++, p++) {
240 page_base = adev->dummy_page_addr;
244 for (j = 0; j < AMDGPU_GPU_PAGES_IN_CPU_PAGE; j++, t++) {
245 amdgpu_gmc_set_pte_pde(adev, adev->gart.ptr,
246 t, page_base, flags);
247 page_base += AMDGPU_GPU_PAGE_SIZE;
251 amdgpu_asic_flush_hdp(adev, NULL);
252 for (i = 0; i < adev->num_vmhubs; i++)
253 amdgpu_gmc_flush_gpu_tlb(adev, 0, i, 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
265 * @flags: page table entry flags
266 * @dst: CPU address of the gart table
268 * Map the dma_addresses into GART entries (all asics).
269 * Returns 0 for success, -EINVAL for failure.
271 int amdgpu_gart_map(struct amdgpu_device *adev, uint64_t offset,
272 int pages, dma_addr_t *dma_addr, uint64_t flags,
278 if (!adev->gart.ready) {
279 WARN(1, "trying to bind memory to uninitialized GART !\n");
283 t = offset / AMDGPU_GPU_PAGE_SIZE;
285 for (i = 0; i < pages; i++) {
286 page_base = dma_addr[i];
287 for (j = 0; j < AMDGPU_GPU_PAGES_IN_CPU_PAGE; j++, t++) {
288 amdgpu_gmc_set_pte_pde(adev, dst, t, page_base, flags);
289 page_base += AMDGPU_GPU_PAGE_SIZE;
296 * amdgpu_gart_bind - bind pages into the gart page table
298 * @adev: amdgpu_device pointer
299 * @offset: offset into the GPU's gart aperture
300 * @pages: number of pages to bind
301 * @pagelist: pages to bind
302 * @dma_addr: DMA addresses of pages
303 * @flags: page table entry flags
305 * Binds the requested pages to the gart page table
307 * Returns 0 for success, -EINVAL for failure.
309 int amdgpu_gart_bind(struct amdgpu_device *adev, uint64_t offset,
310 int pages, struct page **pagelist, dma_addr_t *dma_addr,
315 if (!adev->gart.ready) {
316 WARN(1, "trying to bind memory to uninitialized GART !\n");
323 r = amdgpu_gart_map(adev, offset, pages, dma_addr, flags,
329 amdgpu_asic_flush_hdp(adev, NULL);
330 for (i = 0; i < adev->num_vmhubs; i++)
331 amdgpu_gmc_flush_gpu_tlb(adev, 0, i, 0);
336 * amdgpu_gart_init - init the driver info for managing the gart
338 * @adev: amdgpu_device pointer
340 * Allocate the dummy page and init the gart driver info (all asics).
341 * Returns 0 for success, error for failure.
343 int amdgpu_gart_init(struct amdgpu_device *adev)
347 if (adev->dummy_page_addr)
350 /* We need PAGE_SIZE >= AMDGPU_GPU_PAGE_SIZE */
351 if (PAGE_SIZE < AMDGPU_GPU_PAGE_SIZE) {
352 DRM_ERROR("Page size is smaller than GPU page size!\n");
355 r = amdgpu_gart_dummy_page_init(adev);
358 /* Compute table size */
359 adev->gart.num_cpu_pages = adev->gmc.gart_size / PAGE_SIZE;
360 adev->gart.num_gpu_pages = adev->gmc.gart_size / AMDGPU_GPU_PAGE_SIZE;
361 DRM_INFO("GART: num cpu pages %u, num gpu pages %u\n",
362 adev->gart.num_cpu_pages, adev->gart.num_gpu_pages);
368 * amdgpu_gart_fini - tear down the driver info for managing the gart
370 * @adev: amdgpu_device pointer
372 * Tear down the gart driver info and free the dummy page (all asics).
374 void amdgpu_gart_fini(struct amdgpu_device *adev)
376 amdgpu_gart_dummy_page_fini(adev);