1/*
2 * Copyright 2008 Advanced Micro Devices, Inc.
3 * Copyright 2008 Red Hat Inc.
4 * Copyright 2009 Jerome Glisse.
5 *
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:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
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.
23 *
24 * Authors: Dave Airlie
25 * Alex Deucher
26 * Jerome Glisse
27 */
28
29#include <linux/pci.h>
30#include <linux/vmalloc.h>
31
32#include <drm/amdgpu_drm.h>
33#ifdef CONFIG_X86
34#include <asm/set_memory.h>
35#endif
36#include "amdgpu.h"
37#include <drm/drm_drv.h>
38#include <drm/ttm/ttm_tt.h>
39
40/*
41 * GART
42 * The GART (Graphics Aperture Remapping Table) is an aperture
43 * in the GPU's address space. System pages can be mapped into
44 * the aperture and look like contiguous pages from the GPU's
45 * perspective. A page table maps the pages in the aperture
46 * to the actual backing pages in system memory.
47 *
48 * Radeon GPUs support both an internal GART, as described above,
49 * and AGP. AGP works similarly, but the GART table is configured
50 * and maintained by the northbridge rather than the driver.
51 * Radeon hw has a separate AGP aperture that is programmed to
52 * point to the AGP aperture provided by the northbridge and the
53 * requests are passed through to the northbridge aperture.
54 * Both AGP and internal GART can be used at the same time, however
55 * that is not currently supported by the driver.
56 *
57 * This file handles the common internal GART management.
58 */
59
60/*
61 * Common GART table functions.
62 */
63
64/**
65 * amdgpu_gart_dummy_page_init - init dummy page used by the driver
66 *
67 * @adev: amdgpu_device pointer
68 *
69 * Allocate the dummy page used by the driver (all asics).
70 * This dummy page is used by the driver as a filler for gart entries
71 * when pages are taken out of the GART
72 * Returns 0 on sucess, -ENOMEM on failure.
73 */
74static int amdgpu_gart_dummy_page_init(struct amdgpu_device *adev)
75{
76 struct page *dummy_page = ttm_glob.dummy_read_page;
77
78 if (adev->dummy_page_addr)
79 return 0;
80 adev->dummy_page_addr = dma_map_page(&adev->pdev->dev, dummy_page, 0,
81 PAGE_SIZE, DMA_BIDIRECTIONAL);
82 if (dma_mapping_error(dev: &adev->pdev->dev, dma_addr: adev->dummy_page_addr)) {
83 dev_err(&adev->pdev->dev, "Failed to DMA MAP the dummy page\n");
84 adev->dummy_page_addr = 0;
85 return -ENOMEM;
86 }
87 return 0;
88}
89
90/**
91 * amdgpu_gart_dummy_page_fini - free dummy page used by the driver
92 *
93 * @adev: amdgpu_device pointer
94 *
95 * Frees the dummy page used by the driver (all asics).
96 */
97void amdgpu_gart_dummy_page_fini(struct amdgpu_device *adev)
98{
99 if (!adev->dummy_page_addr)
100 return;
101 dma_unmap_page(&adev->pdev->dev, adev->dummy_page_addr, PAGE_SIZE,
102 DMA_BIDIRECTIONAL);
103 adev->dummy_page_addr = 0;
104}
105
106/**
107 * amdgpu_gart_table_ram_alloc - allocate system ram for gart page table
108 *
109 * @adev: amdgpu_device pointer
110 *
111 * Allocate system memory for GART page table for ASICs that don't have
112 * dedicated VRAM.
113 * Returns 0 for success, error for failure.
114 */
115int amdgpu_gart_table_ram_alloc(struct amdgpu_device *adev)
116{
117 unsigned int order = get_order(size: adev->gart.table_size);
118 gfp_t gfp_flags = GFP_KERNEL | __GFP_ZERO;
119 struct amdgpu_bo *bo = NULL;
120 struct sg_table *sg = NULL;
121 struct amdgpu_bo_param bp;
122 dma_addr_t dma_addr;
123 struct page *p;
124 int ret;
125
126 if (adev->gart.bo != NULL)
127 return 0;
128
129 p = alloc_pages(gfp: gfp_flags, order);
130 if (!p)
131 return -ENOMEM;
132
133 /* If the hardware does not support UTCL2 snooping of the CPU caches
134 * then set_memory_wc() could be used as a workaround to mark the pages
135 * as write combine memory.
136 */
137 dma_addr = dma_map_page(&adev->pdev->dev, p, 0, adev->gart.table_size,
138 DMA_BIDIRECTIONAL);
139 if (dma_mapping_error(dev: &adev->pdev->dev, dma_addr)) {
140 dev_err(&adev->pdev->dev, "Failed to DMA MAP the GART BO page\n");
141 __free_pages(page: p, order);
142 p = NULL;
143 return -EFAULT;
144 }
145
146 dev_info(adev->dev, "%s dma_addr:%pad\n", __func__, &dma_addr);
147 /* Create SG table */
148 sg = kmalloc(size: sizeof(*sg), GFP_KERNEL);
149 if (!sg) {
150 ret = -ENOMEM;
151 goto error;
152 }
153 ret = sg_alloc_table(sg, 1, GFP_KERNEL);
154 if (ret)
155 goto error;
156
157 sg_dma_address(sg->sgl) = dma_addr;
158 sg->sgl->length = adev->gart.table_size;
159#ifdef CONFIG_NEED_SG_DMA_LENGTH
160 sg->sgl->dma_length = adev->gart.table_size;
161#endif
162 /* Create SG BO */
163 memset(&bp, 0, sizeof(bp));
164 bp.size = adev->gart.table_size;
165 bp.byte_align = PAGE_SIZE;
166 bp.domain = AMDGPU_GEM_DOMAIN_CPU;
167 bp.type = ttm_bo_type_sg;
168 bp.resv = NULL;
169 bp.bo_ptr_size = sizeof(struct amdgpu_bo);
170 bp.flags = 0;
171 ret = amdgpu_bo_create(adev, bp: &bp, bo_ptr: &bo);
172 if (ret)
173 goto error;
174
175 bo->tbo.sg = sg;
176 bo->tbo.ttm->sg = sg;
177 bo->allowed_domains = AMDGPU_GEM_DOMAIN_GTT;
178 bo->preferred_domains = AMDGPU_GEM_DOMAIN_GTT;
179
180 ret = amdgpu_bo_reserve(bo, no_intr: true);
181 if (ret) {
182 dev_err(adev->dev, "(%d) failed to reserve bo for GART system bo\n", ret);
183 goto error;
184 }
185
186 ret = amdgpu_bo_pin(bo, AMDGPU_GEM_DOMAIN_GTT);
187 WARN(ret, "Pinning the GART table failed");
188 if (ret)
189 goto error_resv;
190
191 adev->gart.bo = bo;
192 adev->gart.ptr = page_to_virt(p);
193 /* Make GART table accessible in VMID0 */
194 ret = amdgpu_ttm_alloc_gart(bo: &adev->gart.bo->tbo);
195 if (ret)
196 amdgpu_gart_table_ram_free(adev);
197 amdgpu_bo_unreserve(bo);
198
199 return 0;
200
201error_resv:
202 amdgpu_bo_unreserve(bo);
203error:
204 amdgpu_bo_unref(bo: &bo);
205 if (sg) {
206 sg_free_table(sg);
207 kfree(objp: sg);
208 }
209 __free_pages(page: p, order);
210 return ret;
211}
212
213/**
214 * amdgpu_gart_table_ram_free - free gart page table system ram
215 *
216 * @adev: amdgpu_device pointer
217 *
218 * Free the system memory used for the GART page tableon ASICs that don't
219 * have dedicated VRAM.
220 */
221void amdgpu_gart_table_ram_free(struct amdgpu_device *adev)
222{
223 unsigned int order = get_order(size: adev->gart.table_size);
224 struct sg_table *sg = adev->gart.bo->tbo.sg;
225 struct page *p;
226 int ret;
227
228 ret = amdgpu_bo_reserve(bo: adev->gart.bo, no_intr: false);
229 if (!ret) {
230 amdgpu_bo_unpin(bo: adev->gart.bo);
231 amdgpu_bo_unreserve(bo: adev->gart.bo);
232 }
233 amdgpu_bo_unref(bo: &adev->gart.bo);
234 sg_free_table(sg);
235 kfree(objp: sg);
236 p = virt_to_page(adev->gart.ptr);
237 __free_pages(page: p, order);
238
239 adev->gart.ptr = NULL;
240}
241
242/**
243 * amdgpu_gart_table_vram_alloc - allocate vram for gart page table
244 *
245 * @adev: amdgpu_device pointer
246 *
247 * Allocate video memory for GART page table
248 * (pcie r4xx, r5xx+). These asics require the
249 * gart table to be in video memory.
250 * Returns 0 for success, error for failure.
251 */
252int amdgpu_gart_table_vram_alloc(struct amdgpu_device *adev)
253{
254 if (adev->gart.bo != NULL)
255 return 0;
256
257 return amdgpu_bo_create_kernel(adev, size: adev->gart.table_size, PAGE_SIZE,
258 AMDGPU_GEM_DOMAIN_VRAM, bo_ptr: &adev->gart.bo,
259 NULL, cpu_addr: (void *)&adev->gart.ptr);
260}
261
262/**
263 * amdgpu_gart_table_vram_free - free gart page table vram
264 *
265 * @adev: amdgpu_device pointer
266 *
267 * Free the video memory used for the GART page table
268 * (pcie r4xx, r5xx+). These asics require the gart table to
269 * be in video memory.
270 */
271void amdgpu_gart_table_vram_free(struct amdgpu_device *adev)
272{
273 amdgpu_bo_free_kernel(bo: &adev->gart.bo, NULL, cpu_addr: (void *)&adev->gart.ptr);
274}
275
276/*
277 * Common gart functions.
278 */
279/**
280 * amdgpu_gart_unbind - unbind pages from the gart page table
281 *
282 * @adev: amdgpu_device pointer
283 * @offset: offset into the GPU's gart aperture
284 * @pages: number of pages to unbind
285 *
286 * Unbinds the requested pages from the gart page table and
287 * replaces them with the dummy page (all asics).
288 * Returns 0 for success, -EINVAL for failure.
289 */
290void amdgpu_gart_unbind(struct amdgpu_device *adev, uint64_t offset,
291 int pages)
292{
293 unsigned t;
294 unsigned p;
295 int i, j;
296 u64 page_base;
297 /* Starting from VEGA10, system bit must be 0 to mean invalid. */
298 uint64_t flags = 0;
299 int idx;
300
301 if (!adev->gart.ptr)
302 return;
303
304 if (!drm_dev_enter(dev: adev_to_drm(adev), idx: &idx))
305 return;
306
307 t = offset / AMDGPU_GPU_PAGE_SIZE;
308 p = t / AMDGPU_GPU_PAGES_IN_CPU_PAGE;
309 for (i = 0; i < pages; i++, p++) {
310 page_base = adev->dummy_page_addr;
311 if (!adev->gart.ptr)
312 continue;
313
314 for (j = 0; j < AMDGPU_GPU_PAGES_IN_CPU_PAGE; j++, t++) {
315 amdgpu_gmc_set_pte_pde(adev, cpu_pt_addr: adev->gart.ptr,
316 gpu_page_idx: t, addr: page_base, flags);
317 page_base += AMDGPU_GPU_PAGE_SIZE;
318 }
319 }
320 mb();
321 amdgpu_device_flush_hdp(adev, NULL);
322 for_each_set_bit(i, adev->vmhubs_mask, AMDGPU_MAX_VMHUBS)
323 amdgpu_gmc_flush_gpu_tlb(adev, vmid: 0, vmhub: i, flush_type: 0);
324
325 drm_dev_exit(idx);
326}
327
328/**
329 * amdgpu_gart_map - map dma_addresses into GART entries
330 *
331 * @adev: amdgpu_device pointer
332 * @offset: offset into the GPU's gart aperture
333 * @pages: number of pages to bind
334 * @dma_addr: DMA addresses of pages
335 * @flags: page table entry flags
336 * @dst: CPU address of the gart table
337 *
338 * Map the dma_addresses into GART entries (all asics).
339 * Returns 0 for success, -EINVAL for failure.
340 */
341void amdgpu_gart_map(struct amdgpu_device *adev, uint64_t offset,
342 int pages, dma_addr_t *dma_addr, uint64_t flags,
343 void *dst)
344{
345 uint64_t page_base;
346 unsigned i, j, t;
347 int idx;
348
349 if (!drm_dev_enter(dev: adev_to_drm(adev), idx: &idx))
350 return;
351
352 t = offset / AMDGPU_GPU_PAGE_SIZE;
353
354 for (i = 0; i < pages; i++) {
355 page_base = dma_addr[i];
356 for (j = 0; j < AMDGPU_GPU_PAGES_IN_CPU_PAGE; j++, t++) {
357 amdgpu_gmc_set_pte_pde(adev, cpu_pt_addr: dst, gpu_page_idx: t, addr: page_base, flags);
358 page_base += AMDGPU_GPU_PAGE_SIZE;
359 }
360 }
361 drm_dev_exit(idx);
362}
363
364/**
365 * amdgpu_gart_bind - bind pages into the gart page table
366 *
367 * @adev: amdgpu_device pointer
368 * @offset: offset into the GPU's gart aperture
369 * @pages: number of pages to bind
370 * @dma_addr: DMA addresses of pages
371 * @flags: page table entry flags
372 *
373 * Binds the requested pages to the gart page table
374 * (all asics).
375 * Returns 0 for success, -EINVAL for failure.
376 */
377void amdgpu_gart_bind(struct amdgpu_device *adev, uint64_t offset,
378 int pages, dma_addr_t *dma_addr,
379 uint64_t flags)
380{
381 if (!adev->gart.ptr)
382 return;
383
384 amdgpu_gart_map(adev, offset, pages, dma_addr, flags, dst: adev->gart.ptr);
385}
386
387/**
388 * amdgpu_gart_invalidate_tlb - invalidate gart TLB
389 *
390 * @adev: amdgpu device driver pointer
391 *
392 * Invalidate gart TLB which can be use as a way to flush gart changes
393 *
394 */
395void amdgpu_gart_invalidate_tlb(struct amdgpu_device *adev)
396{
397 int i;
398
399 if (!adev->gart.ptr)
400 return;
401
402 mb();
403 amdgpu_device_flush_hdp(adev, NULL);
404 for_each_set_bit(i, adev->vmhubs_mask, AMDGPU_MAX_VMHUBS)
405 amdgpu_gmc_flush_gpu_tlb(adev, vmid: 0, vmhub: i, flush_type: 0);
406}
407
408/**
409 * amdgpu_gart_init - init the driver info for managing the gart
410 *
411 * @adev: amdgpu_device pointer
412 *
413 * Allocate the dummy page and init the gart driver info (all asics).
414 * Returns 0 for success, error for failure.
415 */
416int amdgpu_gart_init(struct amdgpu_device *adev)
417{
418 int r;
419
420 if (adev->dummy_page_addr)
421 return 0;
422
423 /* We need PAGE_SIZE >= AMDGPU_GPU_PAGE_SIZE */
424 if (PAGE_SIZE < AMDGPU_GPU_PAGE_SIZE) {
425 DRM_ERROR("Page size is smaller than GPU page size!\n");
426 return -EINVAL;
427 }
428 r = amdgpu_gart_dummy_page_init(adev);
429 if (r)
430 return r;
431 /* Compute table size */
432 adev->gart.num_cpu_pages = adev->gmc.gart_size / PAGE_SIZE;
433 adev->gart.num_gpu_pages = adev->gmc.gart_size / AMDGPU_GPU_PAGE_SIZE;
434 DRM_INFO("GART: num cpu pages %u, num gpu pages %u\n",
435 adev->gart.num_cpu_pages, adev->gart.num_gpu_pages);
436
437 return 0;
438}
439

source code of linux/drivers/gpu/drm/amd/amdgpu/amdgpu_gart.c