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>
37 #include <drm/drm_drv.h>
41 * The GART (Graphics Aperture Remapping Table) is an aperture
42 * in the GPU's address space. System pages can be mapped into
43 * the aperture and look like contiguous pages from the GPU's
44 * perspective. A page table maps the pages in the aperture
45 * to the actual backing pages in system memory.
47 * Radeon GPUs support both an internal GART, as described above,
48 * and AGP. AGP works similarly, but the GART table is configured
49 * and maintained by the northbridge rather than the driver.
50 * Radeon hw has a separate AGP aperture that is programmed to
51 * point to the AGP aperture provided by the northbridge and the
52 * requests are passed through to the northbridge aperture.
53 * Both AGP and internal GART can be used at the same time, however
54 * that is not currently supported by the driver.
56 * This file handles the common internal GART management.
60 * Common GART table functions.
64 * amdgpu_gart_dummy_page_init - init dummy page used by the driver
66 * @adev: amdgpu_device pointer
68 * Allocate the dummy page used by the driver (all asics).
69 * This dummy page is used by the driver as a filler for gart entries
70 * when pages are taken out of the GART
71 * Returns 0 on sucess, -ENOMEM on failure.
73 static int amdgpu_gart_dummy_page_init(struct amdgpu_device *adev)
75 struct page *dummy_page = ttm_glob.dummy_read_page;
77 if (adev->dummy_page_addr)
79 adev->dummy_page_addr = dma_map_page(&adev->pdev->dev, dummy_page, 0,
80 PAGE_SIZE, DMA_BIDIRECTIONAL);
81 if (dma_mapping_error(&adev->pdev->dev, adev->dummy_page_addr)) {
82 dev_err(&adev->pdev->dev, "Failed to DMA MAP the dummy page\n");
83 adev->dummy_page_addr = 0;
90 * amdgpu_gart_dummy_page_fini - free dummy page used by the driver
92 * @adev: amdgpu_device pointer
94 * Frees the dummy page used by the driver (all asics).
96 void amdgpu_gart_dummy_page_fini(struct amdgpu_device *adev)
98 if (!adev->dummy_page_addr)
100 dma_unmap_page(&adev->pdev->dev, adev->dummy_page_addr, PAGE_SIZE,
102 adev->dummy_page_addr = 0;
106 * amdgpu_gart_table_vram_alloc - allocate vram for gart page table
108 * @adev: amdgpu_device pointer
110 * Allocate video memory for GART page table
111 * (pcie r4xx, r5xx+). These asics require the
112 * gart table to be in video memory.
113 * Returns 0 for success, error for failure.
115 int amdgpu_gart_table_vram_alloc(struct amdgpu_device *adev)
117 if (adev->gart.bo != NULL)
120 return amdgpu_bo_create_kernel(adev, adev->gart.table_size, PAGE_SIZE,
121 AMDGPU_GEM_DOMAIN_VRAM, &adev->gart.bo,
122 NULL, (void *)&adev->gart.ptr);
126 * amdgpu_gart_table_vram_free - free gart page table vram
128 * @adev: amdgpu_device pointer
130 * Free the video memory used for the GART page table
131 * (pcie r4xx, r5xx+). These asics require the gart table to
132 * be in video memory.
134 void amdgpu_gart_table_vram_free(struct amdgpu_device *adev)
136 amdgpu_bo_free_kernel(&adev->gart.bo, NULL, (void *)&adev->gart.ptr);
140 * Common gart functions.
143 * amdgpu_gart_unbind - unbind pages from the gart page table
145 * @adev: amdgpu_device pointer
146 * @offset: offset into the GPU's gart aperture
147 * @pages: number of pages to unbind
149 * Unbinds the requested pages from the gart page table and
150 * replaces them with the dummy page (all asics).
151 * Returns 0 for success, -EINVAL for failure.
153 int amdgpu_gart_unbind(struct amdgpu_device *adev, uint64_t offset,
160 /* Starting from VEGA10, system bit must be 0 to mean invalid. */
164 if (!adev->gart.ready) {
165 WARN(1, "trying to unbind memory from uninitialized GART !\n");
169 if (!drm_dev_enter(adev_to_drm(adev), &idx))
172 t = offset / AMDGPU_GPU_PAGE_SIZE;
173 p = t / AMDGPU_GPU_PAGES_IN_CPU_PAGE;
174 for (i = 0; i < pages; i++, p++) {
175 page_base = adev->dummy_page_addr;
179 for (j = 0; j < AMDGPU_GPU_PAGES_IN_CPU_PAGE; j++, t++) {
180 amdgpu_gmc_set_pte_pde(adev, adev->gart.ptr,
181 t, page_base, flags);
182 page_base += AMDGPU_GPU_PAGE_SIZE;
186 amdgpu_device_flush_hdp(adev, NULL);
187 for (i = 0; i < adev->num_vmhubs; i++)
188 amdgpu_gmc_flush_gpu_tlb(adev, 0, i, 0);
195 * amdgpu_gart_map - map dma_addresses into GART entries
197 * @adev: amdgpu_device pointer
198 * @offset: offset into the GPU's gart aperture
199 * @pages: number of pages to bind
200 * @dma_addr: DMA addresses of pages
201 * @flags: page table entry flags
202 * @dst: CPU address of the gart table
204 * Map the dma_addresses into GART entries (all asics).
205 * Returns 0 for success, -EINVAL for failure.
207 int amdgpu_gart_map(struct amdgpu_device *adev, uint64_t offset,
208 int pages, dma_addr_t *dma_addr, uint64_t flags,
215 if (!adev->gart.ready) {
216 WARN(1, "trying to bind memory to uninitialized GART !\n");
220 if (!drm_dev_enter(adev_to_drm(adev), &idx))
223 t = offset / AMDGPU_GPU_PAGE_SIZE;
225 for (i = 0; i < pages; i++) {
226 page_base = dma_addr[i];
227 for (j = 0; j < AMDGPU_GPU_PAGES_IN_CPU_PAGE; j++, t++) {
228 amdgpu_gmc_set_pte_pde(adev, dst, t, page_base, flags);
229 page_base += AMDGPU_GPU_PAGE_SIZE;
237 * amdgpu_gart_bind - bind pages into the gart page table
239 * @adev: amdgpu_device pointer
240 * @offset: offset into the GPU's gart aperture
241 * @pages: number of pages to bind
242 * @dma_addr: DMA addresses of pages
243 * @flags: page table entry flags
245 * Binds the requested pages to the gart page table
247 * Returns 0 for success, -EINVAL for failure.
249 int amdgpu_gart_bind(struct amdgpu_device *adev, uint64_t offset,
250 int pages, dma_addr_t *dma_addr,
253 if (!adev->gart.ready) {
254 WARN(1, "trying to bind memory to uninitialized GART !\n");
261 return amdgpu_gart_map(adev, offset, pages, dma_addr, flags,
266 * amdgpu_gart_invalidate_tlb - invalidate gart TLB
268 * @adev: amdgpu device driver pointer
270 * Invalidate gart TLB which can be use as a way to flush gart changes
273 void amdgpu_gart_invalidate_tlb(struct amdgpu_device *adev)
278 amdgpu_device_flush_hdp(adev, NULL);
279 for (i = 0; i < adev->num_vmhubs; i++)
280 amdgpu_gmc_flush_gpu_tlb(adev, 0, i, 0);
284 * amdgpu_gart_init - init the driver info for managing the gart
286 * @adev: amdgpu_device pointer
288 * Allocate the dummy page and init the gart driver info (all asics).
289 * Returns 0 for success, error for failure.
291 int amdgpu_gart_init(struct amdgpu_device *adev)
295 if (adev->dummy_page_addr)
298 /* We need PAGE_SIZE >= AMDGPU_GPU_PAGE_SIZE */
299 if (PAGE_SIZE < AMDGPU_GPU_PAGE_SIZE) {
300 DRM_ERROR("Page size is smaller than GPU page size!\n");
303 r = amdgpu_gart_dummy_page_init(adev);
306 /* Compute table size */
307 adev->gart.num_cpu_pages = adev->gmc.gart_size / PAGE_SIZE;
308 adev->gart.num_gpu_pages = adev->gmc.gart_size / AMDGPU_GPU_PAGE_SIZE;
309 DRM_INFO("GART: num cpu pages %u, num gpu pages %u\n",
310 adev->gart.num_cpu_pages, adev->gart.num_gpu_pages);