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 r = amdgpu_bo_create(adev, adev->gart.table_size,
117 PAGE_SIZE, true, AMDGPU_GEM_DOMAIN_VRAM,
118 AMDGPU_GEM_CREATE_CPU_ACCESS_REQUIRED |
119 AMDGPU_GEM_CREATE_VRAM_CONTIGUOUS,
120 NULL, NULL, &adev->gart.robj);
129 * amdgpu_gart_table_vram_pin - pin gart page table in vram
131 * @adev: amdgpu_device pointer
133 * Pin the GART page table in vram so it will not be moved
134 * by the memory manager (pcie r4xx, r5xx+). These asics require the
135 * gart table to be in video memory.
136 * Returns 0 for success, error for failure.
138 int amdgpu_gart_table_vram_pin(struct amdgpu_device *adev)
143 r = amdgpu_bo_reserve(adev->gart.robj, false);
144 if (unlikely(r != 0))
146 r = amdgpu_bo_pin(adev->gart.robj,
147 AMDGPU_GEM_DOMAIN_VRAM, &gpu_addr);
149 amdgpu_bo_unreserve(adev->gart.robj);
152 r = amdgpu_bo_kmap(adev->gart.robj, &adev->gart.ptr);
154 amdgpu_bo_unpin(adev->gart.robj);
155 amdgpu_bo_unreserve(adev->gart.robj);
156 adev->gart.table_addr = gpu_addr;
161 * amdgpu_gart_table_vram_unpin - unpin gart page table in vram
163 * @adev: amdgpu_device pointer
165 * Unpin the GART page table in vram (pcie r4xx, r5xx+).
166 * These asics require the gart table to be in video memory.
168 void amdgpu_gart_table_vram_unpin(struct amdgpu_device *adev)
172 if (adev->gart.robj == NULL) {
175 r = amdgpu_bo_reserve(adev->gart.robj, true);
176 if (likely(r == 0)) {
177 amdgpu_bo_kunmap(adev->gart.robj);
178 amdgpu_bo_unpin(adev->gart.robj);
179 amdgpu_bo_unreserve(adev->gart.robj);
180 adev->gart.ptr = NULL;
185 * amdgpu_gart_table_vram_free - free gart page table vram
187 * @adev: amdgpu_device pointer
189 * Free the video memory used for the GART page table
190 * (pcie r4xx, r5xx+). These asics require the gart table to
191 * be in video memory.
193 void amdgpu_gart_table_vram_free(struct amdgpu_device *adev)
195 if (adev->gart.robj == NULL) {
198 amdgpu_bo_unref(&adev->gart.robj);
202 * Common gart functions.
205 * amdgpu_gart_unbind - unbind pages from the gart page table
207 * @adev: amdgpu_device pointer
208 * @offset: offset into the GPU's gart aperture
209 * @pages: number of pages to unbind
211 * Unbinds the requested pages from the gart page table and
212 * replaces them with the dummy page (all asics).
213 * Returns 0 for success, -EINVAL for failure.
215 int amdgpu_gart_unbind(struct amdgpu_device *adev, uint64_t offset,
222 /* Starting from VEGA10, system bit must be 0 to mean invalid. */
225 if (!adev->gart.ready) {
226 WARN(1, "trying to unbind memory from uninitialized GART !\n");
230 t = offset / AMDGPU_GPU_PAGE_SIZE;
231 p = t / (PAGE_SIZE / AMDGPU_GPU_PAGE_SIZE);
232 for (i = 0; i < pages; i++, p++) {
233 #ifdef CONFIG_DRM_AMDGPU_GART_DEBUGFS
234 adev->gart.pages[p] = NULL;
236 page_base = adev->dummy_page_addr;
240 for (j = 0; j < (PAGE_SIZE / AMDGPU_GPU_PAGE_SIZE); j++, t++) {
241 amdgpu_gmc_set_pte_pde(adev, adev->gart.ptr,
242 t, page_base, flags);
243 page_base += AMDGPU_GPU_PAGE_SIZE;
247 amdgpu_asic_flush_hdp(adev, NULL);
248 amdgpu_gmc_flush_gpu_tlb(adev, 0);
253 * amdgpu_gart_map - map dma_addresses into GART entries
255 * @adev: amdgpu_device pointer
256 * @offset: offset into the GPU's gart aperture
257 * @pages: number of pages to bind
258 * @dma_addr: DMA addresses of pages
260 * Map the dma_addresses into GART entries (all asics).
261 * Returns 0 for success, -EINVAL for failure.
263 int amdgpu_gart_map(struct amdgpu_device *adev, uint64_t offset,
264 int pages, dma_addr_t *dma_addr, uint64_t flags,
270 if (!adev->gart.ready) {
271 WARN(1, "trying to bind memory to uninitialized GART !\n");
275 t = offset / AMDGPU_GPU_PAGE_SIZE;
277 for (i = 0; i < pages; i++) {
278 page_base = dma_addr[i];
279 for (j = 0; j < (PAGE_SIZE / AMDGPU_GPU_PAGE_SIZE); j++, t++) {
280 amdgpu_gmc_set_pte_pde(adev, dst, t, page_base, flags);
281 page_base += AMDGPU_GPU_PAGE_SIZE;
288 * amdgpu_gart_bind - bind pages into the gart page table
290 * @adev: amdgpu_device pointer
291 * @offset: offset into the GPU's gart aperture
292 * @pages: number of pages to bind
293 * @pagelist: pages to bind
294 * @dma_addr: DMA addresses of pages
296 * Binds the requested pages to the gart page table
298 * Returns 0 for success, -EINVAL for failure.
300 int amdgpu_gart_bind(struct amdgpu_device *adev, uint64_t offset,
301 int pages, struct page **pagelist, dma_addr_t *dma_addr,
304 #ifdef CONFIG_DRM_AMDGPU_GART_DEBUGFS
309 if (!adev->gart.ready) {
310 WARN(1, "trying to bind memory to uninitialized GART !\n");
314 #ifdef CONFIG_DRM_AMDGPU_GART_DEBUGFS
315 t = offset / AMDGPU_GPU_PAGE_SIZE;
316 p = t / (PAGE_SIZE / AMDGPU_GPU_PAGE_SIZE);
317 for (i = 0; i < pages; i++, p++)
318 adev->gart.pages[p] = pagelist ? pagelist[i] : NULL;
324 r = amdgpu_gart_map(adev, offset, pages, dma_addr, flags,
330 amdgpu_asic_flush_hdp(adev, NULL);
331 amdgpu_gmc_flush_gpu_tlb(adev, 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);
364 #ifdef CONFIG_DRM_AMDGPU_GART_DEBUGFS
365 /* Allocate pages table */
366 adev->gart.pages = vzalloc(sizeof(void *) * adev->gart.num_cpu_pages);
367 if (adev->gart.pages == NULL)
375 * amdgpu_gart_fini - tear down the driver info for managing the gart
377 * @adev: amdgpu_device pointer
379 * Tear down the gart driver info and free the dummy page (all asics).
381 void amdgpu_gart_fini(struct amdgpu_device *adev)
383 #ifdef CONFIG_DRM_AMDGPU_GART_DEBUGFS
384 vfree(adev->gart.pages);
385 adev->gart.pages = NULL;
387 amdgpu_gart_dummy_page_fini(adev);