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_attrs(&adev->pdev->dev, dummy_page, 0,
82 PAGE_SIZE, DMA_BIDIRECTIONAL,
83 DMA_ATTR_SKIP_CPU_SYNC);
84 if (dma_mapping_error(&adev->pdev->dev, adev->dummy_page_addr)) {
85 dev_err(&adev->pdev->dev, "Failed to DMA MAP the dummy page\n");
86 adev->dummy_page_addr = 0;
93 * amdgpu_gart_dummy_page_fini - free dummy page used by the driver
95 * @adev: amdgpu_device pointer
97 * Frees the dummy page used by the driver (all asics).
99 void amdgpu_gart_dummy_page_fini(struct amdgpu_device *adev)
101 if (!adev->dummy_page_addr)
103 dma_unmap_page_attrs(&adev->pdev->dev, adev->dummy_page_addr, PAGE_SIZE,
105 DMA_ATTR_SKIP_CPU_SYNC);
106 adev->dummy_page_addr = 0;
110 * amdgpu_gart_table_ram_alloc - allocate system ram for gart page table
112 * @adev: amdgpu_device pointer
114 * Allocate system memory for GART page table for ASICs that don't have
116 * Returns 0 for success, error for failure.
118 int amdgpu_gart_table_ram_alloc(struct amdgpu_device *adev)
120 unsigned int order = get_order(adev->gart.table_size);
121 gfp_t gfp_flags = GFP_KERNEL | __GFP_ZERO;
122 struct amdgpu_bo *bo = NULL;
123 struct sg_table *sg = NULL;
124 struct amdgpu_bo_param bp;
130 if (adev->gart.bo != NULL)
133 p = alloc_pages(gfp_flags, order);
137 /* assign pages to this device */
138 for (x = 0; x < (1UL << order); x++)
139 p[x].mapping = adev->mman.bdev.dev_mapping;
141 /* If the hardware does not support UTCL2 snooping of the CPU caches
142 * then set_memory_wc() could be used as a workaround to mark the pages
143 * as write combine memory.
145 dma_addr = dma_map_page(&adev->pdev->dev, p, 0, adev->gart.table_size,
147 if (dma_mapping_error(&adev->pdev->dev, dma_addr)) {
148 dev_err(&adev->pdev->dev, "Failed to DMA MAP the GART BO page\n");
149 __free_pages(p, order);
154 dev_info(adev->dev, "%s dma_addr:%pad\n", __func__, &dma_addr);
155 /* Create SG table */
156 sg = kmalloc(sizeof(*sg), GFP_KERNEL);
161 ret = sg_alloc_table(sg, 1, GFP_KERNEL);
165 sg_dma_address(sg->sgl) = dma_addr;
166 sg->sgl->length = adev->gart.table_size;
167 #ifdef CONFIG_NEED_SG_DMA_LENGTH
168 sg->sgl->dma_length = adev->gart.table_size;
171 memset(&bp, 0, sizeof(bp));
172 bp.size = adev->gart.table_size;
173 bp.byte_align = PAGE_SIZE;
174 bp.domain = AMDGPU_GEM_DOMAIN_CPU;
175 bp.type = ttm_bo_type_sg;
177 bp.bo_ptr_size = sizeof(struct amdgpu_bo);
179 ret = amdgpu_bo_create(adev, &bp, &bo);
184 bo->tbo.ttm->sg = sg;
185 bo->allowed_domains = AMDGPU_GEM_DOMAIN_GTT;
186 bo->preferred_domains = AMDGPU_GEM_DOMAIN_GTT;
188 ret = amdgpu_bo_reserve(bo, true);
190 dev_err(adev->dev, "(%d) failed to reserve bo for GART system bo\n", ret);
194 ret = amdgpu_bo_pin(bo, AMDGPU_GEM_DOMAIN_GTT);
195 WARN(ret, "Pinning the GART table failed");
200 adev->gart.ptr = page_to_virt(p);
201 /* Make GART table accessible in VMID0 */
202 ret = amdgpu_ttm_alloc_gart(&adev->gart.bo->tbo);
204 amdgpu_gart_table_ram_free(adev);
205 amdgpu_bo_unreserve(bo);
210 amdgpu_bo_unreserve(bo);
212 amdgpu_bo_unref(&bo);
217 __free_pages(p, order);
222 * amdgpu_gart_table_ram_free - free gart page table system ram
224 * @adev: amdgpu_device pointer
226 * Free the system memory used for the GART page tableon ASICs that don't
227 * have dedicated VRAM.
229 void amdgpu_gart_table_ram_free(struct amdgpu_device *adev)
231 unsigned int order = get_order(adev->gart.table_size);
232 struct sg_table *sg = adev->gart.bo->tbo.sg;
237 ret = amdgpu_bo_reserve(adev->gart.bo, false);
239 amdgpu_bo_unpin(adev->gart.bo);
240 amdgpu_bo_unreserve(adev->gart.bo);
242 amdgpu_bo_unref(&adev->gart.bo);
245 p = virt_to_page(adev->gart.ptr);
246 for (x = 0; x < (1UL << order); x++)
248 __free_pages(p, order);
250 adev->gart.ptr = NULL;
254 * amdgpu_gart_table_vram_alloc - allocate vram for gart page table
256 * @adev: amdgpu_device pointer
258 * Allocate video memory for GART page table
259 * (pcie r4xx, r5xx+). These asics require the
260 * gart table to be in video memory.
261 * Returns 0 for success, error for failure.
263 int amdgpu_gart_table_vram_alloc(struct amdgpu_device *adev)
265 if (adev->gart.bo != NULL)
268 return amdgpu_bo_create_kernel(adev, adev->gart.table_size, PAGE_SIZE,
269 AMDGPU_GEM_DOMAIN_VRAM, &adev->gart.bo,
270 NULL, (void *)&adev->gart.ptr);
274 * amdgpu_gart_table_vram_free - free gart page table vram
276 * @adev: amdgpu_device pointer
278 * Free the video memory used for the GART page table
279 * (pcie r4xx, r5xx+). These asics require the gart table to
280 * be in video memory.
282 void amdgpu_gart_table_vram_free(struct amdgpu_device *adev)
284 amdgpu_bo_free_kernel(&adev->gart.bo, NULL, (void *)&adev->gart.ptr);
288 * Common gart functions.
291 * amdgpu_gart_unbind - unbind pages from the gart page table
293 * @adev: amdgpu_device pointer
294 * @offset: offset into the GPU's gart aperture
295 * @pages: number of pages to unbind
297 * Unbinds the requested pages from the gart page table and
298 * replaces them with the dummy page (all asics).
299 * Returns 0 for success, -EINVAL for failure.
301 void amdgpu_gart_unbind(struct amdgpu_device *adev, uint64_t offset,
308 /* Starting from VEGA10, system bit must be 0 to mean invalid. */
315 if (!drm_dev_enter(adev_to_drm(adev), &idx))
318 t = offset / AMDGPU_GPU_PAGE_SIZE;
319 p = t / AMDGPU_GPU_PAGES_IN_CPU_PAGE;
320 for (i = 0; i < pages; i++, p++) {
321 page_base = adev->dummy_page_addr;
325 for (j = 0; j < AMDGPU_GPU_PAGES_IN_CPU_PAGE; j++, t++) {
326 amdgpu_gmc_set_pte_pde(adev, adev->gart.ptr,
327 t, page_base, flags);
328 page_base += AMDGPU_GPU_PAGE_SIZE;
331 amdgpu_gart_invalidate_tlb(adev);
337 * amdgpu_gart_map - map dma_addresses into GART entries
339 * @adev: amdgpu_device pointer
340 * @offset: offset into the GPU's gart aperture
341 * @pages: number of pages to bind
342 * @dma_addr: DMA addresses of pages
343 * @flags: page table entry flags
344 * @dst: CPU address of the gart table
346 * Map the dma_addresses into GART entries (all asics).
347 * Returns 0 for success, -EINVAL for failure.
349 void amdgpu_gart_map(struct amdgpu_device *adev, uint64_t offset,
350 int pages, dma_addr_t *dma_addr, uint64_t flags,
357 if (!drm_dev_enter(adev_to_drm(adev), &idx))
360 t = offset / AMDGPU_GPU_PAGE_SIZE;
362 for (i = 0; i < pages; i++) {
363 page_base = dma_addr[i];
364 for (j = 0; j < AMDGPU_GPU_PAGES_IN_CPU_PAGE; j++, t++) {
365 amdgpu_gmc_set_pte_pde(adev, dst, t, page_base, flags);
366 page_base += AMDGPU_GPU_PAGE_SIZE;
373 * amdgpu_gart_bind - bind pages into the gart page table
375 * @adev: amdgpu_device pointer
376 * @offset: offset into the GPU's gart aperture
377 * @pages: number of pages to bind
378 * @dma_addr: DMA addresses of pages
379 * @flags: page table entry flags
381 * Binds the requested pages to the gart page table
383 * Returns 0 for success, -EINVAL for failure.
385 void amdgpu_gart_bind(struct amdgpu_device *adev, uint64_t offset,
386 int pages, dma_addr_t *dma_addr,
392 amdgpu_gart_map(adev, offset, pages, dma_addr, flags, adev->gart.ptr);
396 * amdgpu_gart_invalidate_tlb - invalidate gart TLB
398 * @adev: amdgpu device driver pointer
400 * Invalidate gart TLB which can be use as a way to flush gart changes
403 void amdgpu_gart_invalidate_tlb(struct amdgpu_device *adev)
411 if (down_read_trylock(&adev->reset_domain->sem)) {
412 amdgpu_device_flush_hdp(adev, NULL);
413 up_read(&adev->reset_domain->sem);
415 for_each_set_bit(i, adev->vmhubs_mask, AMDGPU_MAX_VMHUBS)
416 amdgpu_gmc_flush_gpu_tlb(adev, 0, i, 0);
420 * amdgpu_gart_init - init the driver info for managing the gart
422 * @adev: amdgpu_device pointer
424 * Allocate the dummy page and init the gart driver info (all asics).
425 * Returns 0 for success, error for failure.
427 int amdgpu_gart_init(struct amdgpu_device *adev)
431 if (adev->dummy_page_addr)
434 /* We need PAGE_SIZE >= AMDGPU_GPU_PAGE_SIZE */
435 if (PAGE_SIZE < AMDGPU_GPU_PAGE_SIZE) {
436 DRM_ERROR("Page size is smaller than GPU page size!\n");
439 r = amdgpu_gart_dummy_page_init(adev);
442 /* Compute table size */
443 adev->gart.num_cpu_pages = adev->gmc.gart_size / PAGE_SIZE;
444 adev->gart.num_gpu_pages = adev->gmc.gart_size / AMDGPU_GPU_PAGE_SIZE;
445 DRM_INFO("GART: num cpu pages %u, num gpu pages %u\n",
446 adev->gart.num_cpu_pages, adev->gart.num_gpu_pages);