summaryrefslogtreecommitdiff
path: root/drivers/gpu/drm/nouveau/nouveau_dmem.c
blob: e886a3b9e08c7ddd7466cffceee10b530d13f19c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
/*
 * Copyright 2018 Red Hat Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 */
#include "nouveau_dmem.h"
#include "nouveau_drv.h"
#include "nouveau_chan.h"
#include "nouveau_dma.h"
#include "nouveau_mem.h"
#include "nouveau_bo.h"
#include "nouveau_svm.h"

#include <nvif/class.h>
#include <nvif/object.h>
#include <nvif/push906f.h>
#include <nvif/if000c.h>
#include <nvif/if500b.h>
#include <nvif/if900b.h>
#include <nvif/if000c.h>

#include <nvhw/class/cla0b5.h>

#include <linux/sched/mm.h>
#include <linux/hmm.h>
#include <linux/migrate.h>

/*
 * FIXME: this is ugly right now we are using TTM to allocate vram and we pin
 * it in vram while in use. We likely want to overhaul memory management for
 * nouveau to be more page like (not necessarily with system page size but a
 * bigger page size) at lowest level and have some shim layer on top that would
 * provide the same functionality as TTM.
 */
#define DMEM_CHUNK_SIZE (2UL << 20)
#define DMEM_CHUNK_NPAGES (DMEM_CHUNK_SIZE >> PAGE_SHIFT)

enum nouveau_aper {
	NOUVEAU_APER_VIRT,
	NOUVEAU_APER_VRAM,
	NOUVEAU_APER_HOST,
};

typedef int (*nouveau_migrate_copy_t)(struct nouveau_drm *drm, u64 npages,
				      enum nouveau_aper, u64 dst_addr,
				      enum nouveau_aper, u64 src_addr);
typedef int (*nouveau_clear_page_t)(struct nouveau_drm *drm, u32 length,
				      enum nouveau_aper, u64 dst_addr);

struct nouveau_dmem_chunk {
	struct list_head list;
	struct nouveau_bo *bo;
	struct nouveau_drm *drm;
	unsigned long callocated;
	struct dev_pagemap pagemap;
};

struct nouveau_dmem_migrate {
	nouveau_migrate_copy_t copy_func;
	nouveau_clear_page_t clear_func;
	struct nouveau_channel *chan;
};

struct nouveau_dmem {
	struct nouveau_drm *drm;
	struct nouveau_dmem_migrate migrate;
	struct list_head chunks;
	struct mutex mutex;
	struct page *free_pages;
	spinlock_t lock;
};

static struct nouveau_dmem_chunk *nouveau_page_to_chunk(struct page *page)
{
	return container_of(page->pgmap, struct nouveau_dmem_chunk, pagemap);
}

static struct nouveau_drm *page_to_drm(struct page *page)
{
	struct nouveau_dmem_chunk *chunk = nouveau_page_to_chunk(page);

	return chunk->drm;
}

unsigned long nouveau_dmem_page_addr(struct page *page)
{
	struct nouveau_dmem_chunk *chunk = nouveau_page_to_chunk(page);
	unsigned long off = (page_to_pfn(page) << PAGE_SHIFT) -
				chunk->pagemap.range.start;

	return chunk->bo->offset + off;
}

static void nouveau_dmem_page_free(struct page *page)
{
	struct nouveau_dmem_chunk *chunk = nouveau_page_to_chunk(page);
	struct nouveau_dmem *dmem = chunk->drm->dmem;

	spin_lock(&dmem->lock);
	page->zone_device_data = dmem->free_pages;
	dmem->free_pages = page;

	WARN_ON(!chunk->callocated);
	chunk->callocated--;
	/*
	 * FIXME when chunk->callocated reach 0 we should add the chunk to
	 * a reclaim list so that it can be freed in case of memory pressure.
	 */
	spin_unlock(&dmem->lock);
}

static void nouveau_dmem_fence_done(struct nouveau_fence **fence)
{
	if (fence) {
		nouveau_fence_wait(*fence, true, false);
		nouveau_fence_unref(fence);
	} else {
		/*
		 * FIXME wait for channel to be IDLE before calling finalizing
		 * the hmem object.
		 */
	}
}

static vm_fault_t nouveau_dmem_fault_copy_one(struct nouveau_drm *drm,
		struct vm_fault *vmf, struct migrate_vma *args,
		dma_addr_t *dma_addr)
{
	struct device *dev = drm->dev->dev;
	struct page *dpage, *spage;
	struct nouveau_svmm *svmm;

	spage = migrate_pfn_to_page(args->src[0]);
	if (!spage || !(args->src[0] & MIGRATE_PFN_MIGRATE))
		return 0;

	dpage = alloc_page_vma(GFP_HIGHUSER, vmf->vma, vmf->address);
	if (!dpage)
		return VM_FAULT_SIGBUS;
	lock_page(dpage);

	*dma_addr = dma_map_page(dev, dpage, 0, PAGE_SIZE, DMA_BIDIRECTIONAL);
	if (dma_mapping_error(dev, *dma_addr))
		goto error_free_page;

	svmm = spage->zone_device_data;
	mutex_lock(&svmm->mutex);
	nouveau_svmm_invalidate(svmm, args->start, args->end);
	if (drm->dmem->migrate.copy_func(drm, 1, NOUVEAU_APER_HOST, *dma_addr,
			NOUVEAU_APER_VRAM, nouveau_dmem_page_addr(spage)))
		goto error_dma_unmap;
	mutex_unlock(&svmm->mutex);

	args->dst[0] = migrate_pfn(page_to_pfn(dpage));
	return 0;

error_dma_unmap:
	mutex_unlock(&svmm->mutex);
	dma_unmap_page(dev, *dma_addr, PAGE_SIZE, DMA_BIDIRECTIONAL);
error_free_page:
	__free_page(dpage);
	return VM_FAULT_SIGBUS;
}

static vm_fault_t nouveau_dmem_migrate_to_ram(struct vm_fault *vmf)
{
	struct nouveau_drm *drm = page_to_drm(vmf->page);
	struct nouveau_dmem *dmem = drm->dmem;
	struct nouveau_fence *fence;
	unsigned long src = 0, dst = 0;
	dma_addr_t dma_addr = 0;
	vm_fault_t ret;
	struct migrate_vma args = {
		.vma		= vmf->vma,
		.start		= vmf->address,
		.end		= vmf->address + PAGE_SIZE,
		.src		= &src,
		.dst		= &dst,
		.pgmap_owner	= drm->dev,
		.flags		= MIGRATE_VMA_SELECT_DEVICE_PRIVATE,
	};

	/*
	 * FIXME what we really want is to find some heuristic to migrate more
	 * than just one page on CPU fault. When such fault happens it is very
	 * likely that more surrounding page will CPU fault too.
	 */
	if (migrate_vma_setup(&args) < 0)
		return VM_FAULT_SIGBUS;
	if (!args.cpages)
		return 0;

	ret = nouveau_dmem_fault_copy_one(drm, vmf, &args, &dma_addr);
	if (ret || dst == 0)
		goto done;

	nouveau_fence_new(dmem->migrate.chan, false, &fence);
	migrate_vma_pages(&args);
	nouveau_dmem_fence_done(&fence);
	dma_unmap_page(drm->dev->dev, dma_addr, PAGE_SIZE, DMA_BIDIRECTIONAL);
done:
	migrate_vma_finalize(&args);
	return ret;
}

static const struct dev_pagemap_ops nouveau_dmem_pagemap_ops = {
	.page_free		= nouveau_dmem_page_free,
	.migrate_to_ram		= nouveau_dmem_migrate_to_ram,
};

static int
nouveau_dmem_chunk_alloc(struct nouveau_drm *drm, struct page **ppage)
{
	struct nouveau_dmem_chunk *chunk;
	struct resource *res;
	struct page *page;
	void *ptr;
	unsigned long i, pfn_first;
	int ret;

	chunk = kzalloc(sizeof(*chunk), GFP_KERNEL);
	if (chunk == NULL) {
		ret = -ENOMEM;
		goto out;
	}

	/* Allocate unused physical address space for device private pages. */
	res = request_free_mem_region(&iomem_resource, DMEM_CHUNK_SIZE,
				      "nouveau_dmem");
	if (IS_ERR(res)) {
		ret = PTR_ERR(res);
		goto out_free;
	}

	chunk->drm = drm;
	chunk->pagemap.type = MEMORY_DEVICE_PRIVATE;
	chunk->pagemap.range.start = res->start;
	chunk->pagemap.range.end = res->end;
	chunk->pagemap.nr_range = 1;
	chunk->pagemap.ops = &nouveau_dmem_pagemap_ops;
	chunk->pagemap.owner = drm->dev;

	ret = nouveau_bo_new(&drm->client, DMEM_CHUNK_SIZE, 0,
			     NOUVEAU_GEM_DOMAIN_VRAM, 0, 0, NULL, NULL,
			     &chunk->bo);
	if (ret)
		goto out_release;

	ret = nouveau_bo_pin(chunk->bo, NOUVEAU_GEM_DOMAIN_VRAM, false);
	if (ret)
		goto out_bo_free;

	ptr = memremap_pages(&chunk->pagemap, numa_node_id());
	if (IS_ERR(ptr)) {
		ret = PTR_ERR(ptr);
		goto out_bo_unpin;
	}

	mutex_lock(&drm->dmem->mutex);
	list_add(&chunk->list, &drm->dmem->chunks);
	mutex_unlock(&drm->dmem->mutex);

	pfn_first = chunk->pagemap.range.start >> PAGE_SHIFT;
	page = pfn_to_page(pfn_first);
	spin_lock(&drm->dmem->lock);
	for (i = 0; i < DMEM_CHUNK_NPAGES - 1; ++i, ++page) {
		page->zone_device_data = drm->dmem->free_pages;
		drm->dmem->free_pages = page;
	}
	*ppage = page;
	chunk->callocated++;
	spin_unlock(&drm->dmem->lock);

	NV_INFO(drm, "DMEM: registered %ldMB of device memory\n",
		DMEM_CHUNK_SIZE >> 20);

	return 0;

out_bo_unpin:
	nouveau_bo_unpin(chunk->bo);
out_bo_free:
	nouveau_bo_ref(NULL, &chunk->bo);
out_release:
	release_mem_region(chunk->pagemap.range.start, range_len(&chunk->pagemap.range));
out_free:
	kfree(chunk);
out:
	return ret;
}

static struct page *
nouveau_dmem_page_alloc_locked(struct nouveau_drm *drm)
{
	struct nouveau_dmem_chunk *chunk;
	struct page *page = NULL;
	int ret;

	spin_lock(&drm->dmem->lock);
	if (drm->dmem->free_pages) {
		page = drm->dmem->free_pages;
		drm->dmem->free_pages = page->zone_device_data;
		chunk = nouveau_page_to_chunk(page);
		chunk->callocated++;
		spin_unlock(&drm->dmem->lock);
	} else {
		spin_unlock(&drm->dmem->lock);
		ret = nouveau_dmem_chunk_alloc(drm, &page);
		if (ret)
			return NULL;
	}

	get_page(page);
	lock_page(page);
	return page;
}

static void
nouveau_dmem_page_free_locked(struct nouveau_drm *drm, struct page *page)
{
	unlock_page(page);
	put_page(page);
}

void
nouveau_dmem_resume(struct nouveau_drm *drm)
{
	struct nouveau_dmem_chunk *chunk;
	int ret;

	if (drm->dmem == NULL)
		return;

	mutex_lock(&drm->dmem->mutex);
	list_for_each_entry(chunk, &drm->dmem->chunks, list) {
		ret = nouveau_bo_pin(chunk->bo, NOUVEAU_GEM_DOMAIN_VRAM, false);
		/* FIXME handle pin failure */
		WARN_ON(ret);
	}
	mutex_unlock(&drm->dmem->mutex);
}

void
nouveau_dmem_suspend(struct nouveau_drm *drm)
{
	struct nouveau_dmem_chunk *chunk;

	if (drm->dmem == NULL)
		return;

	mutex_lock(&drm->dmem->mutex);
	list_for_each_entry(chunk, &drm->dmem->chunks, list)
		nouveau_bo_unpin(chunk->bo);
	mutex_unlock(&drm->dmem->mutex);
}

void
nouveau_dmem_fini(struct nouveau_drm *drm)
{
	struct nouveau_dmem_chunk *chunk, *tmp;

	if (drm->dmem == NULL)
		return;

	mutex_lock(&drm->dmem->mutex);

	list_for_each_entry_safe(chunk, tmp, &drm->dmem->chunks, list) {
		nouveau_bo_unpin(chunk->bo);
		nouveau_bo_ref(NULL, &chunk->bo);
		list_del(&chunk->list);
		memunmap_pages(&chunk->pagemap);
		release_mem_region(chunk->pagemap.range.start,
				   range_len(&chunk->pagemap.range));
		kfree(chunk);
	}

	mutex_unlock(&drm->dmem->mutex);
}

static int
nvc0b5_migrate_copy(struct nouveau_drm *drm, u64 npages,
		    enum nouveau_aper dst_aper, u64 dst_addr,
		    enum nouveau_aper src_aper, u64 src_addr)
{
	struct nvif_push *push = drm->dmem->migrate.chan->chan.push;
	u32 launch_dma = 0;
	int ret;

	ret = PUSH_WAIT(push, 13);
	if (ret)
		return ret;

	if (src_aper != NOUVEAU_APER_VIRT) {
		switch (src_aper) {
		case NOUVEAU_APER_VRAM:
			PUSH_IMMD(push, NVA0B5, SET_SRC_PHYS_MODE,
				  NVDEF(NVA0B5, SET_SRC_PHYS_MODE, TARGET, LOCAL_FB));
			break;
		case NOUVEAU_APER_HOST:
			PUSH_IMMD(push, NVA0B5, SET_SRC_PHYS_MODE,
				  NVDEF(NVA0B5, SET_SRC_PHYS_MODE, TARGET, COHERENT_SYSMEM));
			break;
		default:
			return -EINVAL;
		}

		launch_dma |= NVDEF(NVA0B5, LAUNCH_DMA, SRC_TYPE, PHYSICAL);
	}

	if (dst_aper != NOUVEAU_APER_VIRT) {
		switch (dst_aper) {
		case NOUVEAU_APER_VRAM:
			PUSH_IMMD(push, NVA0B5, SET_DST_PHYS_MODE,
				  NVDEF(NVA0B5, SET_DST_PHYS_MODE, TARGET, LOCAL_FB));
			break;
		case NOUVEAU_APER_HOST:
			PUSH_IMMD(push, NVA0B5, SET_DST_PHYS_MODE,
				  NVDEF(NVA0B5, SET_DST_PHYS_MODE, TARGET, COHERENT_SYSMEM));
			break;
		default:
			return -EINVAL;
		}

		launch_dma |= NVDEF(NVA0B5, LAUNCH_DMA, DST_TYPE, PHYSICAL);
	}

	PUSH_MTHD(push, NVA0B5, OFFSET_IN_UPPER,
		  NVVAL(NVA0B5, OFFSET_IN_UPPER, UPPER, upper_32_bits(src_addr)),

				OFFSET_IN_LOWER, lower_32_bits(src_addr),

				OFFSET_OUT_UPPER,
		  NVVAL(NVA0B5, OFFSET_OUT_UPPER, UPPER, upper_32_bits(dst_addr)),

				OFFSET_OUT_LOWER, lower_32_bits(dst_addr),
				PITCH_IN, PAGE_SIZE,
				PITCH_OUT, PAGE_SIZE,
				LINE_LENGTH_IN, PAGE_SIZE,
				LINE_COUNT, npages);

	PUSH_MTHD(push, NVA0B5, LAUNCH_DMA, launch_dma |
		  NVDEF(NVA0B5, LAUNCH_DMA, DATA_TRANSFER_TYPE, NON_PIPELINED) |
		  NVDEF(NVA0B5, LAUNCH_DMA, FLUSH_ENABLE, TRUE) |
		  NVDEF(NVA0B5, LAUNCH_DMA, SEMAPHORE_TYPE, NONE) |
		  NVDEF(NVA0B5, LAUNCH_DMA, INTERRUPT_TYPE, NONE) |
		  NVDEF(NVA0B5, LAUNCH_DMA, SRC_MEMORY_LAYOUT, PITCH) |
		  NVDEF(NVA0B5, LAUNCH_DMA, DST_MEMORY_LAYOUT, PITCH) |
		  NVDEF(NVA0B5, LAUNCH_DMA, MULTI_LINE_ENABLE, TRUE) |
		  NVDEF(NVA0B5, LAUNCH_DMA, REMAP_ENABLE, FALSE) |
		  NVDEF(NVA0B5, LAUNCH_DMA, BYPASS_L2, USE_PTE_SETTING));
	return 0;
}

static int
nvc0b5_migrate_clear(struct nouveau_drm *drm, u32 length,
		     enum nouveau_aper dst_aper, u64 dst_addr)
{
	struct nvif_push *push = drm->dmem->migrate.chan->chan.push;
	u32 launch_dma = 0;
	int ret;

	ret = PUSH_WAIT(push, 12);
	if (ret)
		return ret;

	switch (dst_aper) {
	case NOUVEAU_APER_VRAM:
		PUSH_IMMD(push, NVA0B5, SET_DST_PHYS_MODE,
			  NVDEF(NVA0B5, SET_DST_PHYS_MODE, TARGET, LOCAL_FB));
		break;
	case NOUVEAU_APER_HOST:
		PUSH_IMMD(push, NVA0B5, SET_DST_PHYS_MODE,
			  NVDEF(NVA0B5, SET_DST_PHYS_MODE, TARGET, COHERENT_SYSMEM));
		break;
	default:
		return -EINVAL;
	}

	launch_dma |= NVDEF(NVA0B5, LAUNCH_DMA, DST_TYPE, PHYSICAL);

	PUSH_MTHD(push, NVA0B5, SET_REMAP_CONST_A, 0,
				SET_REMAP_CONST_B, 0,

				SET_REMAP_COMPONENTS,
		  NVDEF(NVA0B5, SET_REMAP_COMPONENTS, DST_X, CONST_A) |
		  NVDEF(NVA0B5, SET_REMAP_COMPONENTS, DST_Y, CONST_B) |
		  NVDEF(NVA0B5, SET_REMAP_COMPONENTS, COMPONENT_SIZE, FOUR) |
		  NVDEF(NVA0B5, SET_REMAP_COMPONENTS, NUM_DST_COMPONENTS, TWO));

	PUSH_MTHD(push, NVA0B5, OFFSET_OUT_UPPER,
		  NVVAL(NVA0B5, OFFSET_OUT_UPPER, UPPER, upper_32_bits(dst_addr)),

				OFFSET_OUT_LOWER, lower_32_bits(dst_addr));

	PUSH_MTHD(push, NVA0B5, LINE_LENGTH_IN, length >> 3);

	PUSH_MTHD(push, NVA0B5, LAUNCH_DMA, launch_dma |
		  NVDEF(NVA0B5, LAUNCH_DMA, DATA_TRANSFER_TYPE, NON_PIPELINED) |
		  NVDEF(NVA0B5, LAUNCH_DMA, FLUSH_ENABLE, TRUE) |
		  NVDEF(NVA0B5, LAUNCH_DMA, SEMAPHORE_TYPE, NONE) |
		  NVDEF(NVA0B5, LAUNCH_DMA, INTERRUPT_TYPE, NONE) |
		  NVDEF(NVA0B5, LAUNCH_DMA, SRC_MEMORY_LAYOUT, PITCH) |
		  NVDEF(NVA0B5, LAUNCH_DMA, DST_MEMORY_LAYOUT, PITCH) |
		  NVDEF(NVA0B5, LAUNCH_DMA, MULTI_LINE_ENABLE, FALSE) |
		  NVDEF(NVA0B5, LAUNCH_DMA, REMAP_ENABLE, TRUE) |
		  NVDEF(NVA0B5, LAUNCH_DMA, BYPASS_L2, USE_PTE_SETTING));
	return 0;
}

static int
nouveau_dmem_migrate_init(struct nouveau_drm *drm)
{
	switch (drm->ttm.copy.oclass) {
	case PASCAL_DMA_COPY_A:
	case PASCAL_DMA_COPY_B:
	case  VOLTA_DMA_COPY_A:
	case TURING_DMA_COPY_A:
		drm->dmem->migrate.copy_func = nvc0b5_migrate_copy;
		drm->dmem->migrate.clear_func = nvc0b5_migrate_clear;
		drm->dmem->migrate.chan = drm->ttm.chan;
		return 0;
	default:
		break;
	}
	return -ENODEV;
}

void
nouveau_dmem_init(struct nouveau_drm *drm)
{
	int ret;

	/* This only make sense on PASCAL or newer */
	if (drm->client.device.info.family < NV_DEVICE_INFO_V0_PASCAL)
		return;

	if (!(drm->dmem = kzalloc(sizeof(*drm->dmem), GFP_KERNEL)))
		return;

	drm->dmem->drm = drm;
	mutex_init(&drm->dmem->mutex);
	INIT_LIST_HEAD(&drm->dmem->chunks);
	mutex_init(&drm->dmem->mutex);
	spin_lock_init(&drm->dmem->lock);

	/* Initialize migration dma helpers before registering memory */
	ret = nouveau_dmem_migrate_init(drm);
	if (ret) {
		kfree(drm->dmem);
		drm->dmem = NULL;
	}
}

static unsigned long nouveau_dmem_migrate_copy_one(struct nouveau_drm *drm,
		struct nouveau_svmm *svmm, unsigned long src,
		dma_addr_t *dma_addr, u64 *pfn)
{
	struct device *dev = drm->dev->dev;
	struct page *dpage, *spage;
	unsigned long paddr;

	spage = migrate_pfn_to_page(src);
	if (!(src & MIGRATE_PFN_MIGRATE))
		goto out;

	dpage = nouveau_dmem_page_alloc_locked(drm);
	if (!dpage)
		goto out;

	paddr = nouveau_dmem_page_addr(dpage);
	if (spage) {
		*dma_addr = dma_map_page(dev, spage, 0, page_size(spage),
					 DMA_BIDIRECTIONAL);
		if (dma_mapping_error(dev, *dma_addr))
			goto out_free_page;
		if (drm->dmem->migrate.copy_func(drm, 1,
			NOUVEAU_APER_VRAM, paddr, NOUVEAU_APER_HOST, *dma_addr))
			goto out_dma_unmap;
	} else {
		*dma_addr = DMA_MAPPING_ERROR;
		if (drm->dmem->migrate.clear_func(drm, page_size(dpage),
			NOUVEAU_APER_VRAM, paddr))
			goto out_free_page;
	}

	dpage->zone_device_data = svmm;
	*pfn = NVIF_VMM_PFNMAP_V0_V | NVIF_VMM_PFNMAP_V0_VRAM |
		((paddr >> PAGE_SHIFT) << NVIF_VMM_PFNMAP_V0_ADDR_SHIFT);
	if (src & MIGRATE_PFN_WRITE)
		*pfn |= NVIF_VMM_PFNMAP_V0_W;
	return migrate_pfn(page_to_pfn(dpage));

out_dma_unmap:
	dma_unmap_page(dev, *dma_addr, PAGE_SIZE, DMA_BIDIRECTIONAL);
out_free_page:
	nouveau_dmem_page_free_locked(drm, dpage);
out:
	*pfn = NVIF_VMM_PFNMAP_V0_NONE;
	return 0;
}

static void nouveau_dmem_migrate_chunk(struct nouveau_drm *drm,
		struct nouveau_svmm *svmm, struct migrate_vma *args,
		dma_addr_t *dma_addrs, u64 *pfns)
{
	struct nouveau_fence *fence;
	unsigned long addr = args->start, nr_dma = 0, i;

	for (i = 0; addr < args->end; i++) {
		args->dst[i] = nouveau_dmem_migrate_copy_one(drm, svmm,
				args->src[i], dma_addrs + nr_dma, pfns + i);
		if (!dma_mapping_error(drm->dev->dev, dma_addrs[nr_dma]))
			nr_dma++;
		addr += PAGE_SIZE;
	}

	nouveau_fence_new(drm->dmem->migrate.chan, false, &fence);
	migrate_vma_pages(args);
	nouveau_dmem_fence_done(&fence);
	nouveau_pfns_map(svmm, args->vma->vm_mm, args->start, pfns, i);

	while (nr_dma--) {
		dma_unmap_page(drm->dev->dev, dma_addrs[nr_dma], PAGE_SIZE,
				DMA_BIDIRECTIONAL);
	}
	migrate_vma_finalize(args);
}

int
nouveau_dmem_migrate_vma(struct nouveau_drm *drm,
			 struct nouveau_svmm *svmm,
			 struct vm_area_struct *vma,
			 unsigned long start,
			 unsigned long end)
{
	unsigned long npages = (end - start) >> PAGE_SHIFT;
	unsigned long max = min(SG_MAX_SINGLE_ALLOC, npages);
	dma_addr_t *dma_addrs;
	struct migrate_vma args = {
		.vma		= vma,
		.start		= start,
		.pgmap_owner	= drm->dev,
		.flags		= MIGRATE_VMA_SELECT_SYSTEM,
	};
	unsigned long i;
	u64 *pfns;
	int ret = -ENOMEM;

	if (drm->dmem == NULL)
		return -ENODEV;

	args.src = kcalloc(max, sizeof(*args.src), GFP_KERNEL);
	if (!args.src)
		goto out;
	args.dst = kcalloc(max, sizeof(*args.dst), GFP_KERNEL);
	if (!args.dst)
		goto out_free_src;

	dma_addrs = kmalloc_array(max, sizeof(*dma_addrs), GFP_KERNEL);
	if (!dma_addrs)
		goto out_free_dst;

	pfns = nouveau_pfns_alloc(max);
	if (!pfns)
		goto out_free_dma;

	for (i = 0; i < npages; i += max) {
		args.end = start + (max << PAGE_SHIFT);
		ret = migrate_vma_setup(&args);
		if (ret)
			goto out_free_pfns;

		if (args.cpages)
			nouveau_dmem_migrate_chunk(drm, svmm, &args, dma_addrs,
						   pfns);
		args.start = args.end;
	}

	ret = 0;
out_free_pfns:
	nouveau_pfns_free(pfns);
out_free_dma:
	kfree(dma_addrs);
out_free_dst:
	kfree(args.dst);
out_free_src:
	kfree(args.src);
out:
	return ret;
}