1 /*
2 * Copyright 2016 Advanced Micro Devices, Inc.
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
13 *
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
20 * OTHER DEALINGS IN THE SOFTWARE.
21 *
22 * Authors: Christian König
23 */
24
25 #include <linux/dma-mapping.h>
26 #include <drm/ttm/ttm_range_manager.h>
27
28 #include "amdgpu.h"
29 #include "amdgpu_vm.h"
30 #include "amdgpu_res_cursor.h"
31 #include "amdgpu_atomfirmware.h"
32 #include "atom.h"
33
34 struct amdgpu_vram_reservation {
35 u64 start;
36 u64 size;
37 struct list_head allocated;
38 struct list_head blocks;
39 };
40
41 static inline struct amdgpu_vram_mgr *
to_vram_mgr(struct ttm_resource_manager * man)42 to_vram_mgr(struct ttm_resource_manager *man)
43 {
44 return container_of(man, struct amdgpu_vram_mgr, manager);
45 }
46
47 static inline struct amdgpu_device *
to_amdgpu_device(struct amdgpu_vram_mgr * mgr)48 to_amdgpu_device(struct amdgpu_vram_mgr *mgr)
49 {
50 return container_of(mgr, struct amdgpu_device, mman.vram_mgr);
51 }
52
53 static inline struct drm_buddy_block *
amdgpu_vram_mgr_first_block(struct list_head * list)54 amdgpu_vram_mgr_first_block(struct list_head *list)
55 {
56 return list_first_entry_or_null(list, struct drm_buddy_block, link);
57 }
58
amdgpu_is_vram_mgr_blocks_contiguous(struct list_head * head)59 static inline bool amdgpu_is_vram_mgr_blocks_contiguous(struct list_head *head)
60 {
61 struct drm_buddy_block *block;
62 u64 start, size;
63
64 block = amdgpu_vram_mgr_first_block(head);
65 if (!block)
66 return false;
67
68 while (head != block->link.next) {
69 start = amdgpu_vram_mgr_block_start(block);
70 size = amdgpu_vram_mgr_block_size(block);
71
72 block = list_entry(block->link.next, struct drm_buddy_block, link);
73 if (start + size != amdgpu_vram_mgr_block_start(block))
74 return false;
75 }
76
77 return true;
78 }
79
80
81
82 /**
83 * DOC: mem_info_vram_total
84 *
85 * The amdgpu driver provides a sysfs API for reporting current total VRAM
86 * available on the device
87 * The file mem_info_vram_total is used for this and returns the total
88 * amount of VRAM in bytes
89 */
amdgpu_mem_info_vram_total_show(struct device * dev,struct device_attribute * attr,char * buf)90 static ssize_t amdgpu_mem_info_vram_total_show(struct device *dev,
91 struct device_attribute *attr, char *buf)
92 {
93 struct drm_device *ddev = dev_get_drvdata(dev);
94 struct amdgpu_device *adev = drm_to_adev(ddev);
95
96 return sysfs_emit(buf, "%llu\n", adev->gmc.real_vram_size);
97 }
98
99 /**
100 * DOC: mem_info_vis_vram_total
101 *
102 * The amdgpu driver provides a sysfs API for reporting current total
103 * visible VRAM available on the device
104 * The file mem_info_vis_vram_total is used for this and returns the total
105 * amount of visible VRAM in bytes
106 */
amdgpu_mem_info_vis_vram_total_show(struct device * dev,struct device_attribute * attr,char * buf)107 static ssize_t amdgpu_mem_info_vis_vram_total_show(struct device *dev,
108 struct device_attribute *attr, char *buf)
109 {
110 struct drm_device *ddev = dev_get_drvdata(dev);
111 struct amdgpu_device *adev = drm_to_adev(ddev);
112
113 return sysfs_emit(buf, "%llu\n", adev->gmc.visible_vram_size);
114 }
115
116 /**
117 * DOC: mem_info_vram_used
118 *
119 * The amdgpu driver provides a sysfs API for reporting current total VRAM
120 * available on the device
121 * The file mem_info_vram_used is used for this and returns the total
122 * amount of currently used VRAM in bytes
123 */
amdgpu_mem_info_vram_used_show(struct device * dev,struct device_attribute * attr,char * buf)124 static ssize_t amdgpu_mem_info_vram_used_show(struct device *dev,
125 struct device_attribute *attr,
126 char *buf)
127 {
128 struct drm_device *ddev = dev_get_drvdata(dev);
129 struct amdgpu_device *adev = drm_to_adev(ddev);
130 struct ttm_resource_manager *man = &adev->mman.vram_mgr.manager;
131
132 return sysfs_emit(buf, "%llu\n", ttm_resource_manager_usage(man));
133 }
134
135 /**
136 * DOC: mem_info_vis_vram_used
137 *
138 * The amdgpu driver provides a sysfs API for reporting current total of
139 * used visible VRAM
140 * The file mem_info_vis_vram_used is used for this and returns the total
141 * amount of currently used visible VRAM in bytes
142 */
amdgpu_mem_info_vis_vram_used_show(struct device * dev,struct device_attribute * attr,char * buf)143 static ssize_t amdgpu_mem_info_vis_vram_used_show(struct device *dev,
144 struct device_attribute *attr,
145 char *buf)
146 {
147 struct drm_device *ddev = dev_get_drvdata(dev);
148 struct amdgpu_device *adev = drm_to_adev(ddev);
149
150 return sysfs_emit(buf, "%llu\n",
151 amdgpu_vram_mgr_vis_usage(&adev->mman.vram_mgr));
152 }
153
154 /**
155 * DOC: mem_info_vram_vendor
156 *
157 * The amdgpu driver provides a sysfs API for reporting the vendor of the
158 * installed VRAM
159 * The file mem_info_vram_vendor is used for this and returns the name of the
160 * vendor.
161 */
amdgpu_mem_info_vram_vendor(struct device * dev,struct device_attribute * attr,char * buf)162 static ssize_t amdgpu_mem_info_vram_vendor(struct device *dev,
163 struct device_attribute *attr,
164 char *buf)
165 {
166 struct drm_device *ddev = dev_get_drvdata(dev);
167 struct amdgpu_device *adev = drm_to_adev(ddev);
168
169 switch (adev->gmc.vram_vendor) {
170 case SAMSUNG:
171 return sysfs_emit(buf, "samsung\n");
172 case INFINEON:
173 return sysfs_emit(buf, "infineon\n");
174 case ELPIDA:
175 return sysfs_emit(buf, "elpida\n");
176 case ETRON:
177 return sysfs_emit(buf, "etron\n");
178 case NANYA:
179 return sysfs_emit(buf, "nanya\n");
180 case HYNIX:
181 return sysfs_emit(buf, "hynix\n");
182 case MOSEL:
183 return sysfs_emit(buf, "mosel\n");
184 case WINBOND:
185 return sysfs_emit(buf, "winbond\n");
186 case ESMT:
187 return sysfs_emit(buf, "esmt\n");
188 case MICRON:
189 return sysfs_emit(buf, "micron\n");
190 default:
191 return sysfs_emit(buf, "unknown\n");
192 }
193 }
194
195 static DEVICE_ATTR(mem_info_vram_total, S_IRUGO,
196 amdgpu_mem_info_vram_total_show, NULL);
197 static DEVICE_ATTR(mem_info_vis_vram_total, S_IRUGO,
198 amdgpu_mem_info_vis_vram_total_show,NULL);
199 static DEVICE_ATTR(mem_info_vram_used, S_IRUGO,
200 amdgpu_mem_info_vram_used_show, NULL);
201 static DEVICE_ATTR(mem_info_vis_vram_used, S_IRUGO,
202 amdgpu_mem_info_vis_vram_used_show, NULL);
203 static DEVICE_ATTR(mem_info_vram_vendor, S_IRUGO,
204 amdgpu_mem_info_vram_vendor, NULL);
205
206 static struct attribute *amdgpu_vram_mgr_attributes[] = {
207 &dev_attr_mem_info_vram_total.attr,
208 &dev_attr_mem_info_vis_vram_total.attr,
209 &dev_attr_mem_info_vram_used.attr,
210 &dev_attr_mem_info_vis_vram_used.attr,
211 &dev_attr_mem_info_vram_vendor.attr,
212 NULL
213 };
214
215 const struct attribute_group amdgpu_vram_mgr_attr_group = {
216 .attrs = amdgpu_vram_mgr_attributes
217 };
218
219 /**
220 * amdgpu_vram_mgr_vis_size - Calculate visible block size
221 *
222 * @adev: amdgpu_device pointer
223 * @block: DRM BUDDY block structure
224 *
225 * Calculate how many bytes of the DRM BUDDY block are inside visible VRAM
226 */
amdgpu_vram_mgr_vis_size(struct amdgpu_device * adev,struct drm_buddy_block * block)227 static u64 amdgpu_vram_mgr_vis_size(struct amdgpu_device *adev,
228 struct drm_buddy_block *block)
229 {
230 u64 start = amdgpu_vram_mgr_block_start(block);
231 u64 end = start + amdgpu_vram_mgr_block_size(block);
232
233 if (start >= adev->gmc.visible_vram_size)
234 return 0;
235
236 return (end > adev->gmc.visible_vram_size ?
237 adev->gmc.visible_vram_size : end) - start;
238 }
239
240 /**
241 * amdgpu_vram_mgr_bo_visible_size - CPU visible BO size
242 *
243 * @bo: &amdgpu_bo buffer object (must be in VRAM)
244 *
245 * Returns:
246 * How much of the given &amdgpu_bo buffer object lies in CPU visible VRAM.
247 */
amdgpu_vram_mgr_bo_visible_size(struct amdgpu_bo * bo)248 u64 amdgpu_vram_mgr_bo_visible_size(struct amdgpu_bo *bo)
249 {
250 struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev);
251 struct ttm_resource *res = bo->tbo.resource;
252 struct amdgpu_vram_mgr_resource *vres = to_amdgpu_vram_mgr_resource(res);
253 struct drm_buddy_block *block;
254 u64 usage = 0;
255
256 if (amdgpu_gmc_vram_full_visible(&adev->gmc))
257 return amdgpu_bo_size(bo);
258
259 if (res->start >= adev->gmc.visible_vram_size >> PAGE_SHIFT)
260 return 0;
261
262 list_for_each_entry(block, &vres->blocks, link)
263 usage += amdgpu_vram_mgr_vis_size(adev, block);
264
265 return usage;
266 }
267
268 /* Commit the reservation of VRAM pages */
amdgpu_vram_mgr_do_reserve(struct ttm_resource_manager * man)269 static void amdgpu_vram_mgr_do_reserve(struct ttm_resource_manager *man)
270 {
271 struct amdgpu_vram_mgr *mgr = to_vram_mgr(man);
272 struct amdgpu_device *adev = to_amdgpu_device(mgr);
273 struct drm_buddy *mm = &mgr->mm;
274 struct amdgpu_vram_reservation *rsv, *temp;
275 struct drm_buddy_block *block;
276 uint64_t vis_usage;
277
278 list_for_each_entry_safe(rsv, temp, &mgr->reservations_pending, blocks) {
279 if (drm_buddy_alloc_blocks(mm, rsv->start, rsv->start + rsv->size,
280 rsv->size, mm->chunk_size, &rsv->allocated,
281 DRM_BUDDY_RANGE_ALLOCATION))
282 continue;
283
284 block = amdgpu_vram_mgr_first_block(&rsv->allocated);
285 if (!block)
286 continue;
287
288 dev_dbg(adev->dev, "Reservation 0x%llx - %lld, Succeeded\n",
289 rsv->start, rsv->size);
290
291 vis_usage = amdgpu_vram_mgr_vis_size(adev, block);
292 atomic64_add(vis_usage, &mgr->vis_usage);
293 spin_lock(&man->bdev->lru_lock);
294 man->usage += rsv->size;
295 spin_unlock(&man->bdev->lru_lock);
296 list_move(&rsv->blocks, &mgr->reserved_pages);
297 }
298 }
299
300 /**
301 * amdgpu_vram_mgr_reserve_range - Reserve a range from VRAM
302 *
303 * @mgr: amdgpu_vram_mgr pointer
304 * @start: start address of the range in VRAM
305 * @size: size of the range
306 *
307 * Reserve memory from start address with the specified size in VRAM
308 */
amdgpu_vram_mgr_reserve_range(struct amdgpu_vram_mgr * mgr,uint64_t start,uint64_t size)309 int amdgpu_vram_mgr_reserve_range(struct amdgpu_vram_mgr *mgr,
310 uint64_t start, uint64_t size)
311 {
312 struct amdgpu_vram_reservation *rsv;
313
314 rsv = kzalloc(sizeof(*rsv), GFP_KERNEL);
315 if (!rsv)
316 return -ENOMEM;
317
318 INIT_LIST_HEAD(&rsv->allocated);
319 INIT_LIST_HEAD(&rsv->blocks);
320
321 rsv->start = start;
322 rsv->size = size;
323
324 mutex_lock(&mgr->lock);
325 list_add_tail(&rsv->blocks, &mgr->reservations_pending);
326 amdgpu_vram_mgr_do_reserve(&mgr->manager);
327 mutex_unlock(&mgr->lock);
328
329 return 0;
330 }
331
332 /**
333 * amdgpu_vram_mgr_query_page_status - query the reservation status
334 *
335 * @mgr: amdgpu_vram_mgr pointer
336 * @start: start address of a page in VRAM
337 *
338 * Returns:
339 * -EBUSY: the page is still hold and in pending list
340 * 0: the page has been reserved
341 * -ENOENT: the input page is not a reservation
342 */
amdgpu_vram_mgr_query_page_status(struct amdgpu_vram_mgr * mgr,uint64_t start)343 int amdgpu_vram_mgr_query_page_status(struct amdgpu_vram_mgr *mgr,
344 uint64_t start)
345 {
346 struct amdgpu_vram_reservation *rsv;
347 int ret;
348
349 mutex_lock(&mgr->lock);
350
351 list_for_each_entry(rsv, &mgr->reservations_pending, blocks) {
352 if (rsv->start <= start &&
353 (start < (rsv->start + rsv->size))) {
354 ret = -EBUSY;
355 goto out;
356 }
357 }
358
359 list_for_each_entry(rsv, &mgr->reserved_pages, blocks) {
360 if (rsv->start <= start &&
361 (start < (rsv->start + rsv->size))) {
362 ret = 0;
363 goto out;
364 }
365 }
366
367 ret = -ENOENT;
368 out:
369 mutex_unlock(&mgr->lock);
370 return ret;
371 }
372
373 /**
374 * amdgpu_vram_mgr_new - allocate new ranges
375 *
376 * @man: TTM memory type manager
377 * @tbo: TTM BO we need this range for
378 * @place: placement flags and restrictions
379 * @res: the resulting mem object
380 *
381 * Allocate VRAM for the given BO.
382 */
amdgpu_vram_mgr_new(struct ttm_resource_manager * man,struct ttm_buffer_object * tbo,const struct ttm_place * place,struct ttm_resource ** res)383 static int amdgpu_vram_mgr_new(struct ttm_resource_manager *man,
384 struct ttm_buffer_object *tbo,
385 const struct ttm_place *place,
386 struct ttm_resource **res)
387 {
388 u64 vis_usage = 0, max_bytes, cur_size, min_block_size;
389 struct amdgpu_vram_mgr *mgr = to_vram_mgr(man);
390 struct amdgpu_device *adev = to_amdgpu_device(mgr);
391 struct amdgpu_vram_mgr_resource *vres;
392 u64 size, remaining_size, lpfn, fpfn;
393 struct drm_buddy *mm = &mgr->mm;
394 struct drm_buddy_block *block;
395 unsigned long pages_per_block;
396 int r;
397
398 lpfn = (u64)place->lpfn << PAGE_SHIFT;
399 if (!lpfn)
400 lpfn = man->size;
401
402 fpfn = (u64)place->fpfn << PAGE_SHIFT;
403
404 max_bytes = adev->gmc.mc_vram_size;
405 if (tbo->type != ttm_bo_type_kernel)
406 max_bytes -= AMDGPU_VM_RESERVED_VRAM;
407
408 if (place->flags & TTM_PL_FLAG_CONTIGUOUS) {
409 pages_per_block = ~0ul;
410 } else {
411 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
412 pages_per_block = HPAGE_PMD_NR;
413 #else
414 /* default to 2MB */
415 pages_per_block = 2UL << (20UL - PAGE_SHIFT);
416 #endif
417 pages_per_block = max_t(uint32_t, pages_per_block,
418 tbo->page_alignment);
419 }
420
421 vres = kzalloc(sizeof(*vres), GFP_KERNEL);
422 if (!vres)
423 return -ENOMEM;
424
425 ttm_resource_init(tbo, place, &vres->base);
426
427 /* bail out quickly if there's likely not enough VRAM for this BO */
428 if (ttm_resource_manager_usage(man) > max_bytes) {
429 r = -ENOSPC;
430 goto error_fini;
431 }
432
433 INIT_LIST_HEAD(&vres->blocks);
434
435 if (place->flags & TTM_PL_FLAG_TOPDOWN)
436 vres->flags |= DRM_BUDDY_TOPDOWN_ALLOCATION;
437
438 if (fpfn || lpfn != mgr->mm.size)
439 /* Allocate blocks in desired range */
440 vres->flags |= DRM_BUDDY_RANGE_ALLOCATION;
441
442 remaining_size = (u64)vres->base.num_pages << PAGE_SHIFT;
443
444 mutex_lock(&mgr->lock);
445 while (remaining_size) {
446 if (tbo->page_alignment)
447 min_block_size = (u64)tbo->page_alignment << PAGE_SHIFT;
448 else
449 min_block_size = mgr->default_page_size;
450
451 BUG_ON(min_block_size < mm->chunk_size);
452
453 /* Limit maximum size to 2GiB due to SG table limitations */
454 size = min(remaining_size, 2ULL << 30);
455
456 if (size >= (u64)pages_per_block << PAGE_SHIFT)
457 min_block_size = (u64)pages_per_block << PAGE_SHIFT;
458
459 cur_size = size;
460
461 if (fpfn + size != (u64)place->lpfn << PAGE_SHIFT) {
462 /*
463 * Except for actual range allocation, modify the size and
464 * min_block_size conforming to continuous flag enablement
465 */
466 if (place->flags & TTM_PL_FLAG_CONTIGUOUS) {
467 size = roundup_pow_of_two(size);
468 min_block_size = size;
469 /*
470 * Modify the size value if size is not
471 * aligned with min_block_size
472 */
473 } else if (!IS_ALIGNED(size, min_block_size)) {
474 size = round_up(size, min_block_size);
475 }
476 }
477
478 r = drm_buddy_alloc_blocks(mm, fpfn,
479 lpfn,
480 size,
481 min_block_size,
482 &vres->blocks,
483 vres->flags);
484 if (unlikely(r))
485 goto error_free_blocks;
486
487 if (size > remaining_size)
488 remaining_size = 0;
489 else
490 remaining_size -= size;
491 }
492 mutex_unlock(&mgr->lock);
493
494 if (cur_size != size) {
495 struct drm_buddy_block *block;
496 struct list_head *trim_list;
497 u64 original_size;
498 LIST_HEAD(temp);
499
500 trim_list = &vres->blocks;
501 original_size = (u64)vres->base.num_pages << PAGE_SHIFT;
502
503 /*
504 * If size value is rounded up to min_block_size, trim the last
505 * block to the required size
506 */
507 if (!list_is_singular(&vres->blocks)) {
508 block = list_last_entry(&vres->blocks, typeof(*block), link);
509 list_move_tail(&block->link, &temp);
510 trim_list = &temp;
511 /*
512 * Compute the original_size value by subtracting the
513 * last block size with (aligned size - original size)
514 */
515 original_size = amdgpu_vram_mgr_block_size(block) - (size - cur_size);
516 }
517
518 mutex_lock(&mgr->lock);
519 drm_buddy_block_trim(mm,
520 original_size,
521 trim_list);
522 mutex_unlock(&mgr->lock);
523
524 if (!list_empty(&temp))
525 list_splice_tail(trim_list, &vres->blocks);
526 }
527
528 vres->base.start = 0;
529 list_for_each_entry(block, &vres->blocks, link) {
530 unsigned long start;
531
532 start = amdgpu_vram_mgr_block_start(block) +
533 amdgpu_vram_mgr_block_size(block);
534 start >>= PAGE_SHIFT;
535
536 if (start > vres->base.num_pages)
537 start -= vres->base.num_pages;
538 else
539 start = 0;
540 vres->base.start = max(vres->base.start, start);
541
542 vis_usage += amdgpu_vram_mgr_vis_size(adev, block);
543 }
544
545 if (amdgpu_is_vram_mgr_blocks_contiguous(&vres->blocks))
546 vres->base.placement |= TTM_PL_FLAG_CONTIGUOUS;
547
548 if (adev->gmc.xgmi.connected_to_cpu)
549 vres->base.bus.caching = ttm_cached;
550 else
551 vres->base.bus.caching = ttm_write_combined;
552
553 atomic64_add(vis_usage, &mgr->vis_usage);
554 *res = &vres->base;
555 return 0;
556
557 error_free_blocks:
558 drm_buddy_free_list(mm, &vres->blocks);
559 mutex_unlock(&mgr->lock);
560 error_fini:
561 ttm_resource_fini(man, &vres->base);
562 kfree(vres);
563
564 return r;
565 }
566
567 /**
568 * amdgpu_vram_mgr_del - free ranges
569 *
570 * @man: TTM memory type manager
571 * @res: TTM memory object
572 *
573 * Free the allocated VRAM again.
574 */
amdgpu_vram_mgr_del(struct ttm_resource_manager * man,struct ttm_resource * res)575 static void amdgpu_vram_mgr_del(struct ttm_resource_manager *man,
576 struct ttm_resource *res)
577 {
578 struct amdgpu_vram_mgr_resource *vres = to_amdgpu_vram_mgr_resource(res);
579 struct amdgpu_vram_mgr *mgr = to_vram_mgr(man);
580 struct amdgpu_device *adev = to_amdgpu_device(mgr);
581 struct drm_buddy *mm = &mgr->mm;
582 struct drm_buddy_block *block;
583 uint64_t vis_usage = 0;
584
585 mutex_lock(&mgr->lock);
586 list_for_each_entry(block, &vres->blocks, link)
587 vis_usage += amdgpu_vram_mgr_vis_size(adev, block);
588
589 amdgpu_vram_mgr_do_reserve(man);
590
591 drm_buddy_free_list(mm, &vres->blocks);
592 mutex_unlock(&mgr->lock);
593
594 atomic64_sub(vis_usage, &mgr->vis_usage);
595
596 ttm_resource_fini(man, res);
597 kfree(vres);
598 }
599
600 /**
601 * amdgpu_vram_mgr_alloc_sgt - allocate and fill a sg table
602 *
603 * @adev: amdgpu device pointer
604 * @res: TTM memory object
605 * @offset: byte offset from the base of VRAM BO
606 * @length: number of bytes to export in sg_table
607 * @dev: the other device
608 * @dir: dma direction
609 * @sgt: resulting sg table
610 *
611 * Allocate and fill a sg table from a VRAM allocation.
612 */
amdgpu_vram_mgr_alloc_sgt(struct amdgpu_device * adev,struct ttm_resource * res,u64 offset,u64 length,struct device * dev,enum dma_data_direction dir,struct sg_table ** sgt)613 int amdgpu_vram_mgr_alloc_sgt(struct amdgpu_device *adev,
614 struct ttm_resource *res,
615 u64 offset, u64 length,
616 struct device *dev,
617 enum dma_data_direction dir,
618 struct sg_table **sgt)
619 {
620 struct amdgpu_res_cursor cursor;
621 struct scatterlist *sg;
622 int num_entries = 0;
623 int i, r;
624
625 *sgt = kmalloc(sizeof(**sgt), GFP_KERNEL);
626 if (!*sgt)
627 return -ENOMEM;
628
629 /* Determine the number of DRM_BUDDY blocks to export */
630 amdgpu_res_first(res, offset, length, &cursor);
631 while (cursor.remaining) {
632 num_entries++;
633 amdgpu_res_next(&cursor, cursor.size);
634 }
635
636 r = sg_alloc_table(*sgt, num_entries, GFP_KERNEL);
637 if (r)
638 goto error_free;
639
640 /* Initialize scatterlist nodes of sg_table */
641 for_each_sgtable_sg((*sgt), sg, i)
642 sg->length = 0;
643
644 /*
645 * Walk down DRM_BUDDY blocks to populate scatterlist nodes
646 * @note: Use iterator api to get first the DRM_BUDDY block
647 * and the number of bytes from it. Access the following
648 * DRM_BUDDY block(s) if more buffer needs to exported
649 */
650 amdgpu_res_first(res, offset, length, &cursor);
651 for_each_sgtable_sg((*sgt), sg, i) {
652 phys_addr_t phys = cursor.start + adev->gmc.aper_base;
653 size_t size = cursor.size;
654 dma_addr_t addr;
655
656 addr = dma_map_resource(dev, phys, size, dir,
657 DMA_ATTR_SKIP_CPU_SYNC);
658 r = dma_mapping_error(dev, addr);
659 if (r)
660 goto error_unmap;
661
662 sg_set_page(sg, NULL, size, 0);
663 sg_dma_address(sg) = addr;
664 sg_dma_len(sg) = size;
665
666 amdgpu_res_next(&cursor, cursor.size);
667 }
668
669 return 0;
670
671 error_unmap:
672 for_each_sgtable_sg((*sgt), sg, i) {
673 if (!sg->length)
674 continue;
675
676 dma_unmap_resource(dev, sg->dma_address,
677 sg->length, dir,
678 DMA_ATTR_SKIP_CPU_SYNC);
679 }
680 sg_free_table(*sgt);
681
682 error_free:
683 kfree(*sgt);
684 return r;
685 }
686
687 /**
688 * amdgpu_vram_mgr_free_sgt - allocate and fill a sg table
689 *
690 * @dev: device pointer
691 * @dir: data direction of resource to unmap
692 * @sgt: sg table to free
693 *
694 * Free a previously allocate sg table.
695 */
amdgpu_vram_mgr_free_sgt(struct device * dev,enum dma_data_direction dir,struct sg_table * sgt)696 void amdgpu_vram_mgr_free_sgt(struct device *dev,
697 enum dma_data_direction dir,
698 struct sg_table *sgt)
699 {
700 struct scatterlist *sg;
701 int i;
702
703 for_each_sgtable_sg(sgt, sg, i)
704 dma_unmap_resource(dev, sg->dma_address,
705 sg->length, dir,
706 DMA_ATTR_SKIP_CPU_SYNC);
707 sg_free_table(sgt);
708 kfree(sgt);
709 }
710
711 /**
712 * amdgpu_vram_mgr_vis_usage - how many bytes are used in the visible part
713 *
714 * @mgr: amdgpu_vram_mgr pointer
715 *
716 * Returns how many bytes are used in the visible part of VRAM
717 */
amdgpu_vram_mgr_vis_usage(struct amdgpu_vram_mgr * mgr)718 uint64_t amdgpu_vram_mgr_vis_usage(struct amdgpu_vram_mgr *mgr)
719 {
720 return atomic64_read(&mgr->vis_usage);
721 }
722
723 /**
724 * amdgpu_vram_mgr_intersects - test each drm buddy block for intersection
725 *
726 * @man: TTM memory type manager
727 * @res: The resource to test
728 * @place: The place to test against
729 * @size: Size of the new allocation
730 *
731 * Test each drm buddy block for intersection for eviction decision.
732 */
amdgpu_vram_mgr_intersects(struct ttm_resource_manager * man,struct ttm_resource * res,const struct ttm_place * place,size_t size)733 static bool amdgpu_vram_mgr_intersects(struct ttm_resource_manager *man,
734 struct ttm_resource *res,
735 const struct ttm_place *place,
736 size_t size)
737 {
738 struct amdgpu_vram_mgr_resource *mgr = to_amdgpu_vram_mgr_resource(res);
739 struct drm_buddy_block *block;
740
741 /* Check each drm buddy block individually */
742 list_for_each_entry(block, &mgr->blocks, link) {
743 unsigned long fpfn =
744 amdgpu_vram_mgr_block_start(block) >> PAGE_SHIFT;
745 unsigned long lpfn = fpfn +
746 (amdgpu_vram_mgr_block_size(block) >> PAGE_SHIFT);
747
748 if (place->fpfn < lpfn &&
749 (!place->lpfn || place->lpfn > fpfn))
750 return true;
751 }
752
753 return false;
754 }
755
756 /**
757 * amdgpu_vram_mgr_compatible - test each drm buddy block for compatibility
758 *
759 * @man: TTM memory type manager
760 * @res: The resource to test
761 * @place: The place to test against
762 * @size: Size of the new allocation
763 *
764 * Test each drm buddy block for placement compatibility.
765 */
amdgpu_vram_mgr_compatible(struct ttm_resource_manager * man,struct ttm_resource * res,const struct ttm_place * place,size_t size)766 static bool amdgpu_vram_mgr_compatible(struct ttm_resource_manager *man,
767 struct ttm_resource *res,
768 const struct ttm_place *place,
769 size_t size)
770 {
771 struct amdgpu_vram_mgr_resource *mgr = to_amdgpu_vram_mgr_resource(res);
772 struct drm_buddy_block *block;
773
774 /* Check each drm buddy block individually */
775 list_for_each_entry(block, &mgr->blocks, link) {
776 unsigned long fpfn =
777 amdgpu_vram_mgr_block_start(block) >> PAGE_SHIFT;
778 unsigned long lpfn = fpfn +
779 (amdgpu_vram_mgr_block_size(block) >> PAGE_SHIFT);
780
781 if (fpfn < place->fpfn ||
782 (place->lpfn && lpfn > place->lpfn))
783 return false;
784 }
785
786 return true;
787 }
788
789 /**
790 * amdgpu_vram_mgr_debug - dump VRAM table
791 *
792 * @man: TTM memory type manager
793 * @printer: DRM printer to use
794 *
795 * Dump the table content using printk.
796 */
amdgpu_vram_mgr_debug(struct ttm_resource_manager * man,struct drm_printer * printer)797 static void amdgpu_vram_mgr_debug(struct ttm_resource_manager *man,
798 struct drm_printer *printer)
799 {
800 struct amdgpu_vram_mgr *mgr = to_vram_mgr(man);
801 struct drm_buddy *mm = &mgr->mm;
802 struct drm_buddy_block *block;
803
804 drm_printf(printer, " vis usage:%llu\n",
805 amdgpu_vram_mgr_vis_usage(mgr));
806
807 mutex_lock(&mgr->lock);
808 drm_printf(printer, "default_page_size: %lluKiB\n",
809 mgr->default_page_size >> 10);
810
811 drm_buddy_print(mm, printer);
812
813 drm_printf(printer, "reserved:\n");
814 list_for_each_entry(block, &mgr->reserved_pages, link)
815 drm_buddy_block_print(mm, block, printer);
816 mutex_unlock(&mgr->lock);
817 }
818
819 static const struct ttm_resource_manager_func amdgpu_vram_mgr_func = {
820 .alloc = amdgpu_vram_mgr_new,
821 .free = amdgpu_vram_mgr_del,
822 .intersects = amdgpu_vram_mgr_intersects,
823 .compatible = amdgpu_vram_mgr_compatible,
824 .debug = amdgpu_vram_mgr_debug
825 };
826
827 /**
828 * amdgpu_vram_mgr_init - init VRAM manager and DRM MM
829 *
830 * @adev: amdgpu_device pointer
831 *
832 * Allocate and initialize the VRAM manager.
833 */
amdgpu_vram_mgr_init(struct amdgpu_device * adev)834 int amdgpu_vram_mgr_init(struct amdgpu_device *adev)
835 {
836 struct amdgpu_vram_mgr *mgr = &adev->mman.vram_mgr;
837 struct ttm_resource_manager *man = &mgr->manager;
838 int err;
839
840 ttm_resource_manager_init(man, &adev->mman.bdev,
841 adev->gmc.real_vram_size);
842
843 man->func = &amdgpu_vram_mgr_func;
844
845 err = drm_buddy_init(&mgr->mm, man->size, PAGE_SIZE);
846 if (err)
847 return err;
848
849 mutex_init(&mgr->lock);
850 INIT_LIST_HEAD(&mgr->reservations_pending);
851 INIT_LIST_HEAD(&mgr->reserved_pages);
852 mgr->default_page_size = PAGE_SIZE;
853
854 ttm_set_driver_manager(&adev->mman.bdev, TTM_PL_VRAM, &mgr->manager);
855 ttm_resource_manager_set_used(man, true);
856 return 0;
857 }
858
859 /**
860 * amdgpu_vram_mgr_fini - free and destroy VRAM manager
861 *
862 * @adev: amdgpu_device pointer
863 *
864 * Destroy and free the VRAM manager, returns -EBUSY if ranges are still
865 * allocated inside it.
866 */
amdgpu_vram_mgr_fini(struct amdgpu_device * adev)867 void amdgpu_vram_mgr_fini(struct amdgpu_device *adev)
868 {
869 struct amdgpu_vram_mgr *mgr = &adev->mman.vram_mgr;
870 struct ttm_resource_manager *man = &mgr->manager;
871 int ret;
872 struct amdgpu_vram_reservation *rsv, *temp;
873
874 ttm_resource_manager_set_used(man, false);
875
876 ret = ttm_resource_manager_evict_all(&adev->mman.bdev, man);
877 if (ret)
878 return;
879
880 mutex_lock(&mgr->lock);
881 list_for_each_entry_safe(rsv, temp, &mgr->reservations_pending, blocks)
882 kfree(rsv);
883
884 list_for_each_entry_safe(rsv, temp, &mgr->reserved_pages, blocks) {
885 drm_buddy_free_list(&mgr->mm, &rsv->allocated);
886 kfree(rsv);
887 }
888 drm_buddy_fini(&mgr->mm);
889 mutex_unlock(&mgr->lock);
890
891 ttm_resource_manager_cleanup(man);
892 ttm_set_driver_manager(&adev->mman.bdev, TTM_PL_VRAM, NULL);
893 }
894