summaryrefslogtreecommitdiff
path: root/drivers/gpu/drm/etnaviv/etnaviv_mmu.c
blob: 67bdce5326c6e3a3b6efb3da787e3c58ed22f4b8 (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
// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (C) 2015-2018 Etnaviv Project
 */

#include <linux/dma-mapping.h>
#include <linux/scatterlist.h>

#include "common.xml.h"
#include "etnaviv_cmdbuf.h"
#include "etnaviv_drv.h"
#include "etnaviv_gem.h"
#include "etnaviv_gpu.h"
#include "etnaviv_mmu.h"

static void etnaviv_context_unmap(struct etnaviv_iommu_context *context,
				 unsigned long iova, size_t size)
{
	size_t unmapped_page, unmapped = 0;
	size_t pgsize = SZ_4K;

	if (!IS_ALIGNED(iova | size, pgsize)) {
		pr_err("unaligned: iova 0x%lx size 0x%zx min_pagesz 0x%zx\n",
		       iova, size, pgsize);
		return;
	}

	while (unmapped < size) {
		unmapped_page = context->global->ops->unmap(context, iova,
							    pgsize);
		if (!unmapped_page)
			break;

		iova += unmapped_page;
		unmapped += unmapped_page;
	}
}

static int etnaviv_context_map(struct etnaviv_iommu_context *context,
			      unsigned long iova, phys_addr_t paddr,
			      size_t size, int prot)
{
	unsigned long orig_iova = iova;
	size_t pgsize = SZ_4K;
	size_t orig_size = size;
	int ret = 0;

	if (!IS_ALIGNED(iova | paddr | size, pgsize)) {
		pr_err("unaligned: iova 0x%lx pa %pa size 0x%zx min_pagesz 0x%zx\n",
		       iova, &paddr, size, pgsize);
		return -EINVAL;
	}

	while (size) {
		ret = context->global->ops->map(context, iova, paddr, pgsize,
						prot);
		if (ret)
			break;

		iova += pgsize;
		paddr += pgsize;
		size -= pgsize;
	}

	/* unroll mapping in case something went wrong */
	if (ret)
		etnaviv_context_unmap(context, orig_iova, orig_size - size);

	return ret;
}

static int etnaviv_iommu_map(struct etnaviv_iommu_context *context, u32 iova,
			     struct sg_table *sgt, unsigned len, int prot)
{	struct scatterlist *sg;
	unsigned int da = iova;
	unsigned int i;
	int ret;

	if (!context || !sgt)
		return -EINVAL;

	for_each_sgtable_dma_sg(sgt, sg, i) {
		phys_addr_t pa = sg_dma_address(sg) - sg->offset;
		size_t bytes = sg_dma_len(sg) + sg->offset;

		VERB("map[%d]: %08x %pap(%zx)", i, iova, &pa, bytes);

		ret = etnaviv_context_map(context, da, pa, bytes, prot);
		if (ret)
			goto fail;

		da += bytes;
	}

	context->flush_seq++;

	return 0;

fail:
	etnaviv_context_unmap(context, iova, da - iova);
	return ret;
}

static void etnaviv_iommu_unmap(struct etnaviv_iommu_context *context, u32 iova,
				struct sg_table *sgt, unsigned len)
{
	struct scatterlist *sg;
	unsigned int da = iova;
	int i;

	for_each_sgtable_dma_sg(sgt, sg, i) {
		size_t bytes = sg_dma_len(sg) + sg->offset;

		etnaviv_context_unmap(context, da, bytes);

		VERB("unmap[%d]: %08x(%zx)", i, iova, bytes);

		BUG_ON(!PAGE_ALIGNED(bytes));

		da += bytes;
	}

	context->flush_seq++;
}

static void etnaviv_iommu_remove_mapping(struct etnaviv_iommu_context *context,
	struct etnaviv_vram_mapping *mapping)
{
	struct etnaviv_gem_object *etnaviv_obj = mapping->object;

	lockdep_assert_held(&context->lock);

	etnaviv_iommu_unmap(context, mapping->vram_node.start,
			    etnaviv_obj->sgt, etnaviv_obj->base.size);
	drm_mm_remove_node(&mapping->vram_node);
}

void etnaviv_iommu_reap_mapping(struct etnaviv_vram_mapping *mapping)
{
	struct etnaviv_iommu_context *context = mapping->context;

	lockdep_assert_held(&context->lock);
	WARN_ON(mapping->use);

	etnaviv_iommu_remove_mapping(context, mapping);
	etnaviv_iommu_context_put(mapping->context);
	mapping->context = NULL;
	list_del_init(&mapping->mmu_node);
}

static int etnaviv_iommu_find_iova(struct etnaviv_iommu_context *context,
				   struct drm_mm_node *node, size_t size)
{
	struct etnaviv_vram_mapping *free = NULL;
	enum drm_mm_insert_mode mode = DRM_MM_INSERT_LOW;
	int ret;

	lockdep_assert_held(&context->lock);

	while (1) {
		struct etnaviv_vram_mapping *m, *n;
		struct drm_mm_scan scan;
		struct list_head list;
		bool found;

		ret = drm_mm_insert_node_in_range(&context->mm, node,
						  size, 0, 0, 0, U64_MAX, mode);
		if (ret != -ENOSPC)
			break;

		/* Try to retire some entries */
		drm_mm_scan_init(&scan, &context->mm, size, 0, 0, mode);

		found = 0;
		INIT_LIST_HEAD(&list);
		list_for_each_entry(free, &context->mappings, mmu_node) {
			/* If this vram node has not been used, skip this. */
			if (!free->vram_node.mm)
				continue;

			/*
			 * If the iova is pinned, then it's in-use,
			 * so we must keep its mapping.
			 */
			if (free->use)
				continue;

			list_add(&free->scan_node, &list);
			if (drm_mm_scan_add_block(&scan, &free->vram_node)) {
				found = true;
				break;
			}
		}

		if (!found) {
			/* Nothing found, clean up and fail */
			list_for_each_entry_safe(m, n, &list, scan_node)
				BUG_ON(drm_mm_scan_remove_block(&scan, &m->vram_node));
			break;
		}

		/*
		 * drm_mm does not allow any other operations while
		 * scanning, so we have to remove all blocks first.
		 * If drm_mm_scan_remove_block() returns false, we
		 * can leave the block pinned.
		 */
		list_for_each_entry_safe(m, n, &list, scan_node)
			if (!drm_mm_scan_remove_block(&scan, &m->vram_node))
				list_del_init(&m->scan_node);

		/*
		 * Unmap the blocks which need to be reaped from the MMU.
		 * Clear the mmu pointer to prevent the mapping_get finding
		 * this mapping.
		 */
		list_for_each_entry_safe(m, n, &list, scan_node) {
			etnaviv_iommu_reap_mapping(m);
			list_del_init(&m->scan_node);
		}

		mode = DRM_MM_INSERT_EVICT;

		/*
		 * We removed enough mappings so that the new allocation will
		 * succeed, retry the allocation one more time.
		 */
	}

	return ret;
}

static int etnaviv_iommu_insert_exact(struct etnaviv_iommu_context *context,
		   struct drm_mm_node *node, size_t size, u64 va)
{
	struct etnaviv_vram_mapping *m, *n;
	struct drm_mm_node *scan_node;
	LIST_HEAD(scan_list);
	int ret;

	lockdep_assert_held(&context->lock);

	ret = drm_mm_insert_node_in_range(&context->mm, node, size, 0, 0, va,
					  va + size, DRM_MM_INSERT_LOWEST);
	if (ret != -ENOSPC)
		return ret;

	/*
	 * When we can't insert the node, due to a existing mapping blocking
	 * the address space, there are two possible reasons:
	 * 1. Userspace genuinely messed up and tried to reuse address space
	 * before the last job using this VMA has finished executing.
	 * 2. The existing buffer mappings are idle, but the buffers are not
	 * destroyed yet (likely due to being referenced by another context) in
	 * which case the mappings will not be cleaned up and we must reap them
	 * here to make space for the new mapping.
	 */

	drm_mm_for_each_node_in_range(scan_node, &context->mm, va, va + size) {
		m = container_of(scan_node, struct etnaviv_vram_mapping,
				 vram_node);

		if (m->use)
			return -ENOSPC;

		list_add(&m->scan_node, &scan_list);
	}

	list_for_each_entry_safe(m, n, &scan_list, scan_node) {
		etnaviv_iommu_reap_mapping(m);
		list_del_init(&m->scan_node);
	}

	return drm_mm_insert_node_in_range(&context->mm, node, size, 0, 0, va,
					   va + size, DRM_MM_INSERT_LOWEST);
}

int etnaviv_iommu_map_gem(struct etnaviv_iommu_context *context,
	struct etnaviv_gem_object *etnaviv_obj, u32 memory_base,
	struct etnaviv_vram_mapping *mapping, u64 va)
{
	struct sg_table *sgt = etnaviv_obj->sgt;
	struct drm_mm_node *node;
	int ret;

	lockdep_assert_held(&etnaviv_obj->lock);

	mutex_lock(&context->lock);

	/* v1 MMU can optimize single entry (contiguous) scatterlists */
	if (context->global->version == ETNAVIV_IOMMU_V1 &&
	    sgt->nents == 1 && !(etnaviv_obj->flags & ETNA_BO_FORCE_MMU)) {
		u32 iova;

		iova = sg_dma_address(sgt->sgl) - memory_base;
		if (iova < 0x80000000 - sg_dma_len(sgt->sgl)) {
			mapping->iova = iova;
			mapping->context = etnaviv_iommu_context_get(context);
			list_add_tail(&mapping->mmu_node, &context->mappings);
			ret = 0;
			goto unlock;
		}
	}

	node = &mapping->vram_node;

	if (va)
		ret = etnaviv_iommu_insert_exact(context, node,
						 etnaviv_obj->base.size, va);
	else
		ret = etnaviv_iommu_find_iova(context, node,
					      etnaviv_obj->base.size);
	if (ret < 0)
		goto unlock;

	mapping->iova = node->start;
	ret = etnaviv_iommu_map(context, node->start, sgt, etnaviv_obj->base.size,
				ETNAVIV_PROT_READ | ETNAVIV_PROT_WRITE);

	if (ret < 0) {
		drm_mm_remove_node(node);
		goto unlock;
	}

	mapping->context = etnaviv_iommu_context_get(context);
	list_add_tail(&mapping->mmu_node, &context->mappings);
unlock:
	mutex_unlock(&context->lock);

	return ret;
}

void etnaviv_iommu_unmap_gem(struct etnaviv_iommu_context *context,
	struct etnaviv_vram_mapping *mapping)
{
	WARN_ON(mapping->use);

	mutex_lock(&context->lock);

	/* Bail if the mapping has been reaped by another thread */
	if (!mapping->context) {
		mutex_unlock(&context->lock);
		return;
	}

	/* If the vram node is on the mm, unmap and remove the node */
	if (mapping->vram_node.mm == &context->mm)
		etnaviv_iommu_remove_mapping(context, mapping);

	list_del(&mapping->mmu_node);
	mutex_unlock(&context->lock);
	etnaviv_iommu_context_put(context);
}

static void etnaviv_iommu_context_free(struct kref *kref)
{
	struct etnaviv_iommu_context *context =
		container_of(kref, struct etnaviv_iommu_context, refcount);

	etnaviv_cmdbuf_suballoc_unmap(context, &context->cmdbuf_mapping);

	context->global->ops->free(context);
}
void etnaviv_iommu_context_put(struct etnaviv_iommu_context *context)
{
	kref_put(&context->refcount, etnaviv_iommu_context_free);
}

struct etnaviv_iommu_context *
etnaviv_iommu_context_init(struct etnaviv_iommu_global *global,
			   struct etnaviv_cmdbuf_suballoc *suballoc)
{
	struct etnaviv_iommu_context *ctx;
	int ret;

	if (global->version == ETNAVIV_IOMMU_V1)
		ctx = etnaviv_iommuv1_context_alloc(global);
	else
		ctx = etnaviv_iommuv2_context_alloc(global);

	if (!ctx)
		return NULL;

	ret = etnaviv_cmdbuf_suballoc_map(suballoc, ctx, &ctx->cmdbuf_mapping,
					  global->memory_base);
	if (ret)
		goto out_free;

	if (global->version == ETNAVIV_IOMMU_V1 &&
	    ctx->cmdbuf_mapping.iova > 0x80000000) {
		dev_err(global->dev,
		        "command buffer outside valid memory window\n");
		goto out_unmap;
	}

	return ctx;

out_unmap:
	etnaviv_cmdbuf_suballoc_unmap(ctx, &ctx->cmdbuf_mapping);
out_free:
	global->ops->free(ctx);
	return NULL;
}

void etnaviv_iommu_restore(struct etnaviv_gpu *gpu,
			   struct etnaviv_iommu_context *context)
{
	context->global->ops->restore(gpu, context);
}

int etnaviv_iommu_get_suballoc_va(struct etnaviv_iommu_context *context,
				  struct etnaviv_vram_mapping *mapping,
				  u32 memory_base, dma_addr_t paddr,
				  size_t size)
{
	mutex_lock(&context->lock);

	if (mapping->use > 0) {
		mapping->use++;
		mutex_unlock(&context->lock);
		return 0;
	}

	/*
	 * For MMUv1 we don't add the suballoc region to the pagetables, as
	 * those GPUs can only work with cmdbufs accessed through the linear
	 * window. Instead we manufacture a mapping to make it look uniform
	 * to the upper layers.
	 */
	if (context->global->version == ETNAVIV_IOMMU_V1) {
		mapping->iova = paddr - memory_base;
	} else {
		struct drm_mm_node *node = &mapping->vram_node;
		int ret;

		ret = etnaviv_iommu_find_iova(context, node, size);
		if (ret < 0) {
			mutex_unlock(&context->lock);
			return ret;
		}

		mapping->iova = node->start;
		ret = etnaviv_context_map(context, node->start, paddr, size,
					  ETNAVIV_PROT_READ);
		if (ret < 0) {
			drm_mm_remove_node(node);
			mutex_unlock(&context->lock);
			return ret;
		}

		context->flush_seq++;
	}

	list_add_tail(&mapping->mmu_node, &context->mappings);
	mapping->use = 1;

	mutex_unlock(&context->lock);

	return 0;
}

void etnaviv_iommu_put_suballoc_va(struct etnaviv_iommu_context *context,
		  struct etnaviv_vram_mapping *mapping)
{
	struct drm_mm_node *node = &mapping->vram_node;

	mutex_lock(&context->lock);
	mapping->use--;

	if (mapping->use > 0 || context->global->version == ETNAVIV_IOMMU_V1) {
		mutex_unlock(&context->lock);
		return;
	}

	etnaviv_context_unmap(context, node->start, node->size);
	drm_mm_remove_node(node);
	mutex_unlock(&context->lock);
}

size_t etnaviv_iommu_dump_size(struct etnaviv_iommu_context *context)
{
	return context->global->ops->dump_size(context);
}

void etnaviv_iommu_dump(struct etnaviv_iommu_context *context, void *buf)
{
	context->global->ops->dump(context, buf);
}

int etnaviv_iommu_global_init(struct etnaviv_gpu *gpu)
{
	enum etnaviv_iommu_version version = ETNAVIV_IOMMU_V1;
	struct etnaviv_drm_private *priv = gpu->drm->dev_private;
	struct etnaviv_iommu_global *global;
	struct device *dev = gpu->drm->dev;

	if (gpu->identity.minor_features1 & chipMinorFeatures1_MMU_VERSION)
		version = ETNAVIV_IOMMU_V2;

	if (priv->mmu_global) {
		if (priv->mmu_global->version != version) {
			dev_err(gpu->dev,
				"MMU version doesn't match global version\n");
			return -ENXIO;
		}

		priv->mmu_global->use++;
		return 0;
	}

	global = kzalloc(sizeof(*global), GFP_KERNEL);
	if (!global)
		return -ENOMEM;

	global->bad_page_cpu = dma_alloc_wc(dev, SZ_4K, &global->bad_page_dma,
					    GFP_KERNEL);
	if (!global->bad_page_cpu)
		goto free_global;

	memset32(global->bad_page_cpu, 0xdead55aa, SZ_4K / sizeof(u32));

	if (version == ETNAVIV_IOMMU_V2) {
		global->v2.pta_cpu = dma_alloc_wc(dev, ETNAVIV_PTA_SIZE,
					       &global->v2.pta_dma, GFP_KERNEL);
		if (!global->v2.pta_cpu)
			goto free_bad_page;
	}

	global->dev = dev;
	global->version = version;
	global->use = 1;
	mutex_init(&global->lock);

	if (version == ETNAVIV_IOMMU_V1)
		global->ops = &etnaviv_iommuv1_ops;
	else
		global->ops = &etnaviv_iommuv2_ops;

	priv->mmu_global = global;

	return 0;

free_bad_page:
	dma_free_wc(dev, SZ_4K, global->bad_page_cpu, global->bad_page_dma);
free_global:
	kfree(global);

	return -ENOMEM;
}

void etnaviv_iommu_global_fini(struct etnaviv_gpu *gpu)
{
	struct etnaviv_drm_private *priv = gpu->drm->dev_private;
	struct etnaviv_iommu_global *global = priv->mmu_global;

	if (--global->use > 0)
		return;

	if (global->v2.pta_cpu)
		dma_free_wc(global->dev, ETNAVIV_PTA_SIZE,
			    global->v2.pta_cpu, global->v2.pta_dma);

	if (global->bad_page_cpu)
		dma_free_wc(global->dev, SZ_4K,
			    global->bad_page_cpu, global->bad_page_dma);

	mutex_destroy(&global->lock);
	kfree(global);

	priv->mmu_global = NULL;
}