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 "amdgpu_reset.h"
38 #include <drm/drm_drv.h>
39 #include <drm/ttm/ttm_tt.h>
43 * The GART (Graphics Aperture Remapping Table) is an aperture
44 * in the GPU's address space. System pages can be mapped into
45 * the aperture and look like contiguous pages from the GPU's
46 * perspective. A page table maps the pages in the aperture
47 * to the actual backing pages in system memory.
49 * Radeon GPUs support both an internal GART, as described above,
50 * and AGP. AGP works similarly, but the GART table is configured
51 * and maintained by the northbridge rather than the driver.
52 * Radeon hw has a separate AGP aperture that is programmed to
53 * point to the AGP aperture provided by the northbridge and the
54 * requests are passed through to the northbridge aperture.
55 * Both AGP and internal GART can be used at the same time, however
56 * that is not currently supported by the driver.
58 * This file handles the common internal GART management.
62 * Common GART table functions.
66 * amdgpu_gart_dummy_page_init - init dummy page used by the driver
68 * @adev: amdgpu_device pointer
70 * Allocate the dummy page used by the driver (all asics).
71 * This dummy page is used by the driver as a filler for gart entries
72 * when pages are taken out of the GART
73 * Returns 0 on sucess, -ENOMEM on failure.
75 static int amdgpu_gart_dummy_page_init(struct amdgpu_device *adev)
77 struct page *dummy_page = ttm_glob.dummy_read_page;
79 if (adev->dummy_page_addr)
81 adev->dummy_page_addr = dma_map_page(&adev->pdev->dev, dummy_page, 0,
82 PAGE_SIZE, DMA_BIDIRECTIONAL);
83 if (dma_mapping_error(&adev->pdev->dev, adev->dummy_page_addr)) {
84 dev_err(&adev->pdev->dev, "Failed to DMA MAP the dummy page\n");
85 adev->dummy_page_addr = 0;
92 * amdgpu_gart_dummy_page_fini - free dummy page used by the driver
94 * @adev: amdgpu_device pointer
96 * Frees the dummy page used by the driver (all asics).
98 void amdgpu_gart_dummy_page_fini(struct amdgpu_device *adev)
100 if (!adev->dummy_page_addr)
102 dma_unmap_page(&adev->pdev->dev, adev->dummy_page_addr, PAGE_SIZE,
104 adev->dummy_page_addr = 0;
108 * amdgpu_gart_table_ram_alloc - allocate system ram for gart page table
110 * @adev: amdgpu_device pointer
112 * Allocate system memory for GART page table for ASICs that don't have
114 * Returns 0 for success, error for failure.
116 int amdgpu_gart_table_ram_alloc(struct amdgpu_device *adev)
118 unsigned int order = get_order(adev->gart.table_size);
119 gfp_t gfp_flags = GFP_KERNEL | __GFP_ZERO;
120 struct amdgpu_bo *bo = NULL;
121 struct sg_table *sg = NULL;
122 struct amdgpu_bo_param bp;
128 if (adev->gart.bo != NULL)
131 p = alloc_pages(gfp_flags, order);
135 /* assign pages to this device */
136 for (x = 0; x < (1UL << order); x++)
137 p[x].mapping = adev->mman.bdev.dev_mapping;
139 /* If the hardware does not support UTCL2 snooping of the CPU caches
140 * then set_memory_wc() could be used as a workaround to mark the pages
141 * as write combine memory.
143 dma_addr = dma_map_page(&adev->pdev->dev, p, 0, adev->gart.table_size,
145 if (dma_mapping_error(&adev->pdev->dev, dma_addr)) {
146 dev_err(&adev->pdev->dev, "Failed to DMA MAP the GART BO page\n");
147 __free_pages(p, order);
152 dev_info(adev->dev, "%s dma_addr:%pad\n", __func__, &dma_addr);
153 /* Create SG table */
154 sg = kmalloc(sizeof(*sg), GFP_KERNEL);
159 ret = sg_alloc_table(sg, 1, GFP_KERNEL);
163 sg_dma_address(sg->sgl) = dma_addr;
164 sg->sgl->length = adev->gart.table_size;
165 #ifdef CONFIG_NEED_SG_DMA_LENGTH
166 sg->sgl->dma_length = adev->gart.table_size;
169 memset(&bp, 0, sizeof(bp));
170 bp.size = adev->gart.table_size;
171 bp.byte_align = PAGE_SIZE;
172 bp.domain = AMDGPU_GEM_DOMAIN_CPU;
173 bp.type = ttm_bo_type_sg;
175 bp.bo_ptr_size = sizeof(struct amdgpu_bo);
177 ret = amdgpu_bo_create(adev, &bp, &bo);
182 bo->tbo.ttm->sg = sg;
183 bo->allowed_domains = AMDGPU_GEM_DOMAIN_GTT;
184 bo->preferred_domains = AMDGPU_GEM_DOMAIN_GTT;
186 ret = amdgpu_bo_reserve(bo, true);
188 dev_err(adev->dev, "(%d) failed to reserve bo for GART system bo\n", ret);
192 ret = amdgpu_bo_pin(bo, AMDGPU_GEM_DOMAIN_GTT);
193 WARN(ret, "Pinning the GART table failed");
198 adev->gart.ptr = page_to_virt(p);
199 /* Make GART table accessible in VMID0 */
200 ret = amdgpu_ttm_alloc_gart(&adev->gart.bo->tbo);
202 amdgpu_gart_table_ram_free(adev);
203 amdgpu_bo_unreserve(bo);
208 amdgpu_bo_unreserve(bo);
210 amdgpu_bo_unref(&bo);
215 __free_pages(p, order);
220 * amdgpu_gart_table_ram_free - free gart page table system ram
222 * @adev: amdgpu_device pointer
224 * Free the system memory used for the GART page tableon ASICs that don't
225 * have dedicated VRAM.
227 void amdgpu_gart_table_ram_free(struct amdgpu_device *adev)
229 unsigned int order = get_order(adev->gart.table_size);
230 struct sg_table *sg = adev->gart.bo->tbo.sg;
235 ret = amdgpu_bo_reserve(adev->gart.bo, false);
237 amdgpu_bo_unpin(adev->gart.bo);
238 amdgpu_bo_unreserve(adev->gart.bo);
240 amdgpu_bo_unref(&adev->gart.bo);
243 p = virt_to_page(adev->gart.ptr);
244 for (x = 0; x < (1UL << order); x++)
246 __free_pages(p, order);
248 adev->gart.ptr = NULL;
252 * amdgpu_gart_table_vram_alloc - allocate vram for gart page table
254 * @adev: amdgpu_device pointer
256 * Allocate video memory for GART page table
257 * (pcie r4xx, r5xx+). These asics require the
258 * gart table to be in video memory.
259 * Returns 0 for success, error for failure.
261 int amdgpu_gart_table_vram_alloc(struct amdgpu_device *adev)
263 if (adev->gart.bo != NULL)
266 return amdgpu_bo_create_kernel(adev, adev->gart.table_size, PAGE_SIZE,
267 AMDGPU_GEM_DOMAIN_VRAM, &adev->gart.bo,
268 NULL, (void *)&adev->gart.ptr);
272 * amdgpu_gart_table_vram_free - free gart page table vram
274 * @adev: amdgpu_device pointer
276 * Free the video memory used for the GART page table
277 * (pcie r4xx, r5xx+). These asics require the gart table to
278 * be in video memory.
280 void amdgpu_gart_table_vram_free(struct amdgpu_device *adev)
282 amdgpu_bo_free_kernel(&adev->gart.bo, NULL, (void *)&adev->gart.ptr);
286 * Common gart functions.
289 * amdgpu_gart_unbind - unbind pages from the gart page table
291 * @adev: amdgpu_device pointer
292 * @offset: offset into the GPU's gart aperture
293 * @pages: number of pages to unbind
295 * Unbinds the requested pages from the gart page table and
296 * replaces them with the dummy page (all asics).
297 * Returns 0 for success, -EINVAL for failure.
299 void amdgpu_gart_unbind(struct amdgpu_device *adev, uint64_t offset,
306 /* Starting from VEGA10, system bit must be 0 to mean invalid. */
313 if (!drm_dev_enter(adev_to_drm(adev), &idx))
316 t = offset / AMDGPU_GPU_PAGE_SIZE;
317 p = t / AMDGPU_GPU_PAGES_IN_CPU_PAGE;
318 for (i = 0; i < pages; i++, p++) {
319 page_base = adev->dummy_page_addr;
323 for (j = 0; j < AMDGPU_GPU_PAGES_IN_CPU_PAGE; j++, t++) {
324 amdgpu_gmc_set_pte_pde(adev, adev->gart.ptr,
325 t, page_base, flags);
326 page_base += AMDGPU_GPU_PAGE_SIZE;
329 amdgpu_gart_invalidate_tlb(adev);
335 * amdgpu_gart_map - map dma_addresses into GART entries
337 * @adev: amdgpu_device pointer
338 * @offset: offset into the GPU's gart aperture
339 * @pages: number of pages to bind
340 * @dma_addr: DMA addresses of pages
341 * @flags: page table entry flags
342 * @dst: CPU address of the gart table
344 * Map the dma_addresses into GART entries (all asics).
345 * Returns 0 for success, -EINVAL for failure.
347 void amdgpu_gart_map(struct amdgpu_device *adev, uint64_t offset,
348 int pages, dma_addr_t *dma_addr, uint64_t flags,
355 if (!drm_dev_enter(adev_to_drm(adev), &idx))
358 t = offset / AMDGPU_GPU_PAGE_SIZE;
360 for (i = 0; i < pages; i++) {
361 page_base = dma_addr[i];
362 for (j = 0; j < AMDGPU_GPU_PAGES_IN_CPU_PAGE; j++, t++) {
363 amdgpu_gmc_set_pte_pde(adev, dst, t, page_base, flags);
364 page_base += AMDGPU_GPU_PAGE_SIZE;
371 * amdgpu_gart_bind - bind pages into the gart page table
373 * @adev: amdgpu_device pointer
374 * @offset: offset into the GPU's gart aperture
375 * @pages: number of pages to bind
376 * @dma_addr: DMA addresses of pages
377 * @flags: page table entry flags
379 * Binds the requested pages to the gart page table
381 * Returns 0 for success, -EINVAL for failure.
383 void amdgpu_gart_bind(struct amdgpu_device *adev, uint64_t offset,
384 int pages, dma_addr_t *dma_addr,
390 amdgpu_gart_map(adev, offset, pages, dma_addr, flags, adev->gart.ptr);
394 * amdgpu_gart_invalidate_tlb - invalidate gart TLB
396 * @adev: amdgpu device driver pointer
398 * Invalidate gart TLB which can be use as a way to flush gart changes
401 void amdgpu_gart_invalidate_tlb(struct amdgpu_device *adev)
409 if (down_read_trylock(&adev->reset_domain->sem)) {
410 amdgpu_device_flush_hdp(adev, NULL);
411 up_read(&adev->reset_domain->sem);
413 for_each_set_bit(i, adev->vmhubs_mask, AMDGPU_MAX_VMHUBS)
414 amdgpu_gmc_flush_gpu_tlb(adev, 0, i, 0);
418 * amdgpu_gart_init - init the driver info for managing the gart
420 * @adev: amdgpu_device pointer
422 * Allocate the dummy page and init the gart driver info (all asics).
423 * Returns 0 for success, error for failure.
425 int amdgpu_gart_init(struct amdgpu_device *adev)
429 if (adev->dummy_page_addr)
432 /* We need PAGE_SIZE >= AMDGPU_GPU_PAGE_SIZE */
433 if (PAGE_SIZE < AMDGPU_GPU_PAGE_SIZE) {
434 DRM_ERROR("Page size is smaller than GPU page size!\n");
437 r = amdgpu_gart_dummy_page_init(adev);
440 /* Compute table size */
441 adev->gart.num_cpu_pages = adev->gmc.gart_size / PAGE_SIZE;
442 adev->gart.num_gpu_pages = adev->gmc.gart_size / AMDGPU_GPU_PAGE_SIZE;
443 DRM_INFO("GART: num cpu pages %u, num gpu pages %u\n",
444 adev->gart.num_cpu_pages, adev->gart.num_gpu_pages);