Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
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 "amdgpu_reset.h"
38#include <drm/drm_drv.h>
39#include <drm/ttm/ttm_tt.h>
40
41/*
42 * GART
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.
48 *
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.
57 *
58 * This file handles the common internal GART management.
59 */
60
61/*
62 * Common GART table functions.
63 */
64
65/**
66 * amdgpu_gart_dummy_page_init - init dummy page used by the driver
67 *
68 * @adev: amdgpu_device pointer
69 *
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.
74 */
75static int amdgpu_gart_dummy_page_init(struct amdgpu_device *adev)
76{
77 struct page *dummy_page = ttm_glob.dummy_read_page;
78
79 if (adev->dummy_page_addr)
80 return 0;
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;
87 return -ENOMEM;
88 }
89 return 0;
90}
91
92/**
93 * amdgpu_gart_dummy_page_fini - free dummy page used by the driver
94 *
95 * @adev: amdgpu_device pointer
96 *
97 * Frees the dummy page used by the driver (all asics).
98 */
99void amdgpu_gart_dummy_page_fini(struct amdgpu_device *adev)
100{
101 if (!adev->dummy_page_addr)
102 return;
103 dma_unmap_page_attrs(&adev->pdev->dev, adev->dummy_page_addr, PAGE_SIZE,
104 DMA_BIDIRECTIONAL,
105 DMA_ATTR_SKIP_CPU_SYNC);
106 adev->dummy_page_addr = 0;
107}
108
109/**
110 * amdgpu_gart_table_ram_alloc - allocate system ram for gart page table
111 *
112 * @adev: amdgpu_device pointer
113 *
114 * Allocate system memory for GART page table for ASICs that don't have
115 * dedicated VRAM.
116 * Returns 0 for success, error for failure.
117 */
118int amdgpu_gart_table_ram_alloc(struct amdgpu_device *adev)
119{
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;
125 dma_addr_t dma_addr;
126 struct page *p;
127 unsigned long x;
128 int ret;
129
130 if (adev->gart.bo != NULL)
131 return 0;
132
133 p = alloc_pages(gfp_flags, order);
134 if (!p)
135 return -ENOMEM;
136
137 /* assign pages to this device */
138 for (x = 0; x < (1UL << order); x++)
139 p[x].mapping = adev->mman.bdev.dev_mapping;
140
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.
144 */
145 dma_addr = dma_map_page(&adev->pdev->dev, p, 0, adev->gart.table_size,
146 DMA_BIDIRECTIONAL);
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);
150 p = NULL;
151 return -EFAULT;
152 }
153
154 dev_info(adev->dev, "%s dma_addr:%pad\n", __func__, &dma_addr);
155 /* Create SG table */
156 sg = kmalloc_obj(*sg);
157 if (!sg) {
158 ret = -ENOMEM;
159 goto error;
160 }
161 ret = sg_alloc_table(sg, 1, GFP_KERNEL);
162 if (ret)
163 goto error;
164
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;
169#endif
170 /* Create SG BO */
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;
176 bp.resv = NULL;
177 bp.bo_ptr_size = sizeof(struct amdgpu_bo);
178 bp.flags = 0;
179 ret = amdgpu_bo_create(adev, &bp, &bo);
180 if (ret)
181 goto error;
182
183 bo->tbo.sg = sg;
184 bo->tbo.ttm->sg = sg;
185 bo->allowed_domains = AMDGPU_GEM_DOMAIN_GTT;
186 bo->preferred_domains = AMDGPU_GEM_DOMAIN_GTT;
187
188 ret = amdgpu_bo_reserve(bo, true);
189 if (ret) {
190 dev_err(adev->dev, "(%d) failed to reserve bo for GART system bo\n", ret);
191 goto error;
192 }
193
194 ret = amdgpu_bo_pin(bo, AMDGPU_GEM_DOMAIN_GTT);
195 WARN(ret, "Pinning the GART table failed");
196 if (ret)
197 goto error_resv;
198
199 adev->gart.bo = bo;
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);
203 if (ret)
204 amdgpu_gart_table_ram_free(adev);
205 amdgpu_bo_unreserve(bo);
206
207 return 0;
208
209error_resv:
210 amdgpu_bo_unreserve(bo);
211error:
212 amdgpu_bo_unref(&bo);
213 if (sg) {
214 sg_free_table(sg);
215 kfree(sg);
216 }
217 __free_pages(p, order);
218 return ret;
219}
220
221/**
222 * amdgpu_gart_table_ram_free - free gart page table system ram
223 *
224 * @adev: amdgpu_device pointer
225 *
226 * Free the system memory used for the GART page tableon ASICs that don't
227 * have dedicated VRAM.
228 */
229void amdgpu_gart_table_ram_free(struct amdgpu_device *adev)
230{
231 unsigned int order = get_order(adev->gart.table_size);
232 struct sg_table *sg = adev->gart.bo->tbo.sg;
233 struct page *p;
234 unsigned long x;
235 int ret;
236
237 ret = amdgpu_bo_reserve(adev->gart.bo, false);
238 if (!ret) {
239 amdgpu_bo_unpin(adev->gart.bo);
240 amdgpu_bo_unreserve(adev->gart.bo);
241 }
242 amdgpu_bo_unref(&adev->gart.bo);
243 sg_free_table(sg);
244 kfree(sg);
245 p = virt_to_page(adev->gart.ptr);
246 for (x = 0; x < (1UL << order); x++)
247 p[x].mapping = NULL;
248 __free_pages(p, order);
249
250 adev->gart.ptr = NULL;
251}
252
253/**
254 * amdgpu_gart_table_vram_alloc - allocate vram for gart page table
255 *
256 * @adev: amdgpu_device pointer
257 *
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.
262 */
263int amdgpu_gart_table_vram_alloc(struct amdgpu_device *adev)
264{
265 int r;
266
267 if (adev->gart.bo != NULL)
268 return 0;
269
270 r = amdgpu_bo_create_kernel(adev, adev->gart.table_size, PAGE_SIZE,
271 AMDGPU_GEM_DOMAIN_VRAM, &adev->gart.bo,
272 NULL, (void *)&adev->gart.ptr);
273 if (r)
274 return r;
275
276 memset_io(adev->gart.ptr, adev->gart.gart_pte_flags, adev->gart.table_size);
277 return 0;
278}
279
280/**
281 * amdgpu_gart_table_vram_free - free gart page table vram
282 *
283 * @adev: amdgpu_device pointer
284 *
285 * Free the video memory used for the GART page table
286 * (pcie r4xx, r5xx+). These asics require the gart table to
287 * be in video memory.
288 */
289void amdgpu_gart_table_vram_free(struct amdgpu_device *adev)
290{
291 amdgpu_bo_free_kernel(&adev->gart.bo, NULL, (void *)&adev->gart.ptr);
292}
293
294/*
295 * Common gart functions.
296 */
297/**
298 * amdgpu_gart_unbind - unbind pages from the gart page table
299 *
300 * @adev: amdgpu_device pointer
301 * @offset: offset into the GPU's gart aperture
302 * @pages: number of pages to unbind
303 *
304 * Unbinds the requested pages from the gart page table and
305 * replaces them with the dummy page (all asics).
306 * Returns 0 for success, -EINVAL for failure.
307 */
308void amdgpu_gart_unbind(struct amdgpu_device *adev, uint64_t offset,
309 int pages)
310{
311 unsigned t;
312 int i, j;
313 u64 page_base;
314 /* Starting from VEGA10, system bit must be 0 to mean invalid. */
315 uint64_t flags = 0;
316 int idx;
317
318 if (!adev->gart.ptr)
319 return;
320
321 if (!drm_dev_enter(adev_to_drm(adev), &idx))
322 return;
323
324 t = offset / AMDGPU_GPU_PAGE_SIZE;
325 for (i = 0; i < pages; i++) {
326 page_base = adev->dummy_page_addr;
327 if (!adev->gart.ptr)
328 continue;
329
330 for (j = 0; j < AMDGPU_GPU_PAGES_IN_CPU_PAGE; j++, t++) {
331 amdgpu_gmc_set_pte_pde(adev, adev->gart.ptr,
332 t, page_base, flags);
333 page_base += AMDGPU_GPU_PAGE_SIZE;
334 }
335 }
336 amdgpu_gart_invalidate_tlb(adev);
337
338 drm_dev_exit(idx);
339}
340
341/**
342 * amdgpu_gart_map - map dma_addresses into GART entries
343 *
344 * @adev: amdgpu_device pointer
345 * @offset: offset into the GPU's gart aperture
346 * @pages: number of pages to bind
347 * @dma_addr: DMA addresses of pages
348 * @flags: page table entry flags
349 * @dst: CPU address of the gart table
350 *
351 * Map the dma_addresses into GART entries (all asics).
352 * Returns 0 for success, -EINVAL for failure.
353 */
354void amdgpu_gart_map(struct amdgpu_device *adev, uint64_t offset,
355 int pages, dma_addr_t *dma_addr, uint64_t flags,
356 void *dst)
357{
358 uint64_t page_base;
359 unsigned i, j, t;
360 int idx;
361
362 if (!drm_dev_enter(adev_to_drm(adev), &idx))
363 return;
364
365 t = offset / AMDGPU_GPU_PAGE_SIZE;
366
367 for (i = 0; i < pages; i++) {
368 page_base = dma_addr[i];
369 for (j = 0; j < AMDGPU_GPU_PAGES_IN_CPU_PAGE; j++, t++) {
370 amdgpu_gmc_set_pte_pde(adev, dst, t, page_base, flags);
371 page_base += AMDGPU_GPU_PAGE_SIZE;
372 }
373 }
374 drm_dev_exit(idx);
375}
376
377/**
378 * amdgpu_gart_map_vram_range - map VRAM pages into the GART page table
379 *
380 * @adev: amdgpu_device pointer
381 * @pa: physical address of the first page to be mapped
382 * @start_page: first page to map in the GART aperture
383 * @num_pages: number of pages to be mapped
384 * @flags: page table entry flags
385 * @dst: valid CPU address of GART table, cannot be null
386 *
387 * Binds a BO that is allocated in VRAM to the GART page table
388 * (all ASICs).
389 *
390 * Useful when a kernel BO is located in VRAM but
391 * needs to be accessed from the GART address space.
392 */
393void amdgpu_gart_map_vram_range(struct amdgpu_device *adev, uint64_t pa,
394 uint64_t start_page, uint64_t num_pages,
395 uint64_t flags, void *dst)
396{
397 u32 i, idx;
398
399 /* The SYSTEM flag indicates the pages aren't in VRAM. */
400 WARN_ON_ONCE(flags & AMDGPU_PTE_SYSTEM);
401
402 if (!drm_dev_enter(adev_to_drm(adev), &idx))
403 return;
404
405 for (i = 0; i < num_pages; ++i) {
406 amdgpu_gmc_set_pte_pde(adev, dst,
407 start_page + i, pa + AMDGPU_GPU_PAGE_SIZE * i, flags);
408 }
409
410 drm_dev_exit(idx);
411}
412
413/**
414 * amdgpu_gart_map_gfx9_mqd - map mqd and ctrl_stack dma_addresses into GART entries
415 *
416 * @adev: amdgpu_device pointer
417 * @offset: offset into the GPU's gart aperture
418 * @pages: number of pages to bind
419 * @dma_addr: DMA addresses of pages
420 * @flags: page table entry flags
421 *
422 * Map the MQD and control stack addresses into GART entries with the correct
423 * memory types on gfxv9. The MQD occupies the first 4KB and is followed by
424 * the control stack. The MQD uses UC (uncached) memory, while the control stack
425 * uses NC (non-coherent) memory.
426 */
427void amdgpu_gart_map_gfx9_mqd(struct amdgpu_device *adev, uint64_t offset,
428 int pages, dma_addr_t *dma_addr, uint64_t flags)
429{
430 uint64_t page_base;
431 unsigned int i, j, t;
432 int idx;
433 uint64_t ctrl_flags = AMDGPU_PTE_MTYPE_VG10(flags, AMDGPU_MTYPE_NC);
434 void *dst;
435
436 if (!adev->gart.ptr)
437 return;
438
439 if (!drm_dev_enter(adev_to_drm(adev), &idx))
440 return;
441
442 t = offset / AMDGPU_GPU_PAGE_SIZE;
443 dst = adev->gart.ptr;
444 for (i = 0; i < pages; i++) {
445 page_base = dma_addr[i];
446 for (j = 0; j < AMDGPU_GPU_PAGES_IN_CPU_PAGE; j++, t++) {
447 if ((i == 0) && (j == 0))
448 amdgpu_gmc_set_pte_pde(adev, dst, t, page_base, flags);
449 else
450 amdgpu_gmc_set_pte_pde(adev, dst, t, page_base, ctrl_flags);
451 page_base += AMDGPU_GPU_PAGE_SIZE;
452 }
453 }
454 drm_dev_exit(idx);
455}
456
457/**
458 * amdgpu_gart_bind - bind pages into the gart page table
459 *
460 * @adev: amdgpu_device pointer
461 * @offset: offset into the GPU's gart aperture
462 * @pages: number of pages to bind
463 * @dma_addr: DMA addresses of pages
464 * @flags: page table entry flags
465 *
466 * Binds the requested pages to the gart page table
467 * (all asics).
468 * Returns 0 for success, -EINVAL for failure.
469 */
470void amdgpu_gart_bind(struct amdgpu_device *adev, uint64_t offset,
471 int pages, dma_addr_t *dma_addr,
472 uint64_t flags)
473{
474 if (!adev->gart.ptr)
475 return;
476
477 amdgpu_gart_map(adev, offset, pages, dma_addr, flags, adev->gart.ptr);
478}
479
480/**
481 * amdgpu_gart_invalidate_tlb - invalidate gart TLB
482 *
483 * @adev: amdgpu device driver pointer
484 *
485 * Invalidate gart TLB which can be use as a way to flush gart changes
486 *
487 */
488void amdgpu_gart_invalidate_tlb(struct amdgpu_device *adev)
489{
490 int i;
491
492 if (!adev->gart.ptr)
493 return;
494
495 mb();
496 if (down_read_trylock(&adev->reset_domain->sem)) {
497 amdgpu_device_flush_hdp(adev, NULL);
498 up_read(&adev->reset_domain->sem);
499 }
500 for_each_set_bit(i, adev->vmhubs_mask, AMDGPU_MAX_VMHUBS)
501 amdgpu_gmc_flush_gpu_tlb(adev, 0, i, 0);
502}
503
504/**
505 * amdgpu_gart_init - init the driver info for managing the gart
506 *
507 * @adev: amdgpu_device pointer
508 *
509 * Allocate the dummy page and init the gart driver info (all asics).
510 * Returns 0 for success, error for failure.
511 */
512int amdgpu_gart_init(struct amdgpu_device *adev)
513{
514 int r;
515
516 if (adev->dummy_page_addr)
517 return 0;
518
519 /* We need PAGE_SIZE >= AMDGPU_GPU_PAGE_SIZE */
520 if (PAGE_SIZE < AMDGPU_GPU_PAGE_SIZE) {
521 DRM_ERROR("Page size is smaller than GPU page size!\n");
522 return -EINVAL;
523 }
524 r = amdgpu_gart_dummy_page_init(adev);
525 if (r)
526 return r;
527 /* Compute table size */
528 adev->gart.num_cpu_pages = adev->gmc.gart_size / PAGE_SIZE;
529 adev->gart.num_gpu_pages = adev->gmc.gart_size / AMDGPU_GPU_PAGE_SIZE;
530 drm_info(adev_to_drm(adev), "GART: num cpu pages %u, num gpu pages %u\n",
531 adev->gart.num_cpu_pages, adev->gart.num_gpu_pages);
532
533 return 0;
534}