summaryrefslogtreecommitdiff
path: root/linux-core/drm_bo_move.c
blob: 9ab28b03370f6ceff7e7aabe5b85df025814cbb4 (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
/**************************************************************************
 *
 * Copyright (c) 2007 Tungsten Graphics, Inc., Cedar Park, TX., USA
 * All Rights Reserved.
 *
 * 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, sub license, 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 (including the
 * next paragraph) 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 NON-INFRINGEMENT. IN NO EVENT SHALL
 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS 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.
 *
 **************************************************************************/
/*
 * Authors: Thomas Hellström <thomas-at-tungstengraphics-dot-com>
 */

#include "drmP.h"

/**
 * Free the old memory node unless it's a pinned region and we
 * have not been requested to free also pinned regions.
 */

static void drm_bo_free_old_node(struct drm_buffer_object * bo)
{
	struct drm_bo_mem_reg *old_mem = &bo->mem;

	if (old_mem->mm_node && (old_mem->mm_node != bo->pinned_node)) {
		mutex_lock(&bo->dev->struct_mutex);
		drm_mm_put_block(old_mem->mm_node);
		old_mem->mm_node = NULL;
		mutex_unlock(&bo->dev->struct_mutex);
	}
	old_mem->mm_node = NULL;
}

int drm_bo_move_ttm(struct drm_buffer_object * bo,
		    int evict, int no_wait, struct drm_bo_mem_reg * new_mem)
{
	struct drm_ttm *ttm = bo->ttm;
	struct drm_bo_mem_reg *old_mem = &bo->mem;
	uint64_t save_flags = old_mem->flags;
	uint64_t save_mask = old_mem->mask;
	int ret;

	if (old_mem->mem_type == DRM_BO_MEM_TT) {
		if (evict)
			drm_ttm_evict(ttm);
		else
			drm_ttm_unbind(ttm);

		drm_bo_free_old_node(bo);
		DRM_FLAG_MASKED(old_mem->flags,
				DRM_BO_FLAG_CACHED | DRM_BO_FLAG_MAPPABLE |
				DRM_BO_FLAG_MEM_LOCAL, DRM_BO_MASK_MEMTYPE);
		old_mem->mem_type = DRM_BO_MEM_LOCAL;
		save_flags = old_mem->flags;
	}
	if (new_mem->mem_type != DRM_BO_MEM_LOCAL) {
		ret = drm_bind_ttm(ttm, new_mem);
		if (ret)
			return ret;
	}

	*old_mem = *new_mem;
	new_mem->mm_node = NULL;
	old_mem->mask = save_mask;
	DRM_FLAG_MASKED(save_flags, new_mem->flags, DRM_BO_MASK_MEMTYPE);
	return 0;
}

EXPORT_SYMBOL(drm_bo_move_ttm);

/**
 * \c Return a kernel virtual address to the buffer object PCI memory.
 *
 * \param bo The buffer object.
 * \return Failure indication.
 *
 * Returns -EINVAL if the buffer object is currently not mappable.
 * Returns -ENOMEM if the ioremap operation failed.
 * Otherwise returns zero.
 *
 * After a successfull call, bo->iomap contains the virtual address, or NULL
 * if the buffer object content is not accessible through PCI space.
 * Call bo->mutex locked.
 */

int drm_mem_reg_ioremap(struct drm_device * dev, struct drm_bo_mem_reg * mem,
			void **virtual)
{
	struct drm_buffer_manager *bm = &dev->bm;
	struct drm_mem_type_manager *man = &bm->man[mem->mem_type];
	unsigned long bus_offset;
	unsigned long bus_size;
	unsigned long bus_base;
	int ret;
	void *addr;

	*virtual = NULL;
	ret = drm_bo_pci_offset(dev, mem, &bus_base, &bus_offset, &bus_size);
	if (ret || bus_size == 0)
		return ret;

	if (!(man->flags & _DRM_FLAG_NEEDS_IOREMAP))
		addr = (void *)(((u8 *) man->io_addr) + bus_offset);
	else {
		addr = ioremap_nocache(bus_base + bus_offset, bus_size);
		if (!addr)
			return -ENOMEM;
	}
	*virtual = addr;
	return 0;
}
EXPORT_SYMBOL(drm_mem_reg_ioremap);

/**
 * \c Unmap mapping obtained using drm_bo_ioremap
 *
 * \param bo The buffer object.
 *
 * Call bo->mutex locked.
 */

void drm_mem_reg_iounmap(struct drm_device * dev, struct drm_bo_mem_reg * mem,
			 void *virtual)
{
	struct drm_buffer_manager *bm;
	struct drm_mem_type_manager *man;

	bm = &dev->bm;
	man = &bm->man[mem->mem_type];

	if (virtual && (man->flags & _DRM_FLAG_NEEDS_IOREMAP)) {
		iounmap(virtual);
	}
}

static int drm_copy_io_page(void *dst, void *src, unsigned long page)
{
	uint32_t *dstP =
	    (uint32_t *) ((unsigned long)dst + (page << PAGE_SHIFT));
	uint32_t *srcP =
	    (uint32_t *) ((unsigned long)src + (page << PAGE_SHIFT));

	int i;
	for (i = 0; i < PAGE_SIZE / sizeof(uint32_t); ++i)
		iowrite32(ioread32(srcP++), dstP++);
	return 0;
}

static int drm_copy_io_ttm_page(struct drm_ttm * ttm, void *src, unsigned long page)
{
	struct page *d = drm_ttm_get_page(ttm, page);
	void *dst;

	if (!d)
		return -ENOMEM;

	src = (void *)((unsigned long)src + (page << PAGE_SHIFT));
	dst = kmap(d);
	if (!dst)
		return -ENOMEM;

	memcpy_fromio(dst, src, PAGE_SIZE);
	kunmap(d);
	return 0;
}

static int drm_copy_ttm_io_page(struct drm_ttm * ttm, void *dst, unsigned long page)
{
	struct page *s = drm_ttm_get_page(ttm, page);
	void *src;

	if (!s)
		return -ENOMEM;

	dst = (void *)((unsigned long)dst + (page << PAGE_SHIFT));
	src = kmap(s);
	if (!src)
		return -ENOMEM;

	memcpy_toio(dst, src, PAGE_SIZE);
	kunmap(s);
	return 0;
}

int drm_bo_move_memcpy(struct drm_buffer_object * bo,
		       int evict, int no_wait, struct drm_bo_mem_reg * new_mem)
{
	struct drm_device *dev = bo->dev;
	struct drm_mem_type_manager *man = &dev->bm.man[new_mem->mem_type];
	struct drm_ttm *ttm = bo->ttm;
	struct drm_bo_mem_reg *old_mem = &bo->mem;
	struct drm_bo_mem_reg old_copy = *old_mem;
	void *old_iomap;
	void *new_iomap;
	int ret;
	uint64_t save_flags = old_mem->flags;
	uint64_t save_mask = old_mem->mask;
	unsigned long i;
	unsigned long page;
	unsigned long add = 0;
	int dir;

	ret = drm_mem_reg_ioremap(dev, old_mem, &old_iomap);
	if (ret)
		return ret;
	ret = drm_mem_reg_ioremap(dev, new_mem, &new_iomap);
	if (ret)
		goto out;

	if (old_iomap == NULL && new_iomap == NULL)
		goto out2;
	if (old_iomap == NULL && ttm == NULL)
		goto out2;

	add = 0;
	dir = 1;

	if ((old_mem->mem_type == new_mem->mem_type) &&
	    (new_mem->mm_node->start <
	     old_mem->mm_node->start + old_mem->mm_node->size)) {
		dir = -1;
		add = new_mem->num_pages - 1;
	}

	for (i = 0; i < new_mem->num_pages; ++i) {
		page = i * dir + add;
		if (old_iomap == NULL)
			ret = drm_copy_ttm_io_page(ttm, new_iomap, page);
		else if (new_iomap == NULL)
			ret = drm_copy_io_ttm_page(ttm, old_iomap, page);
		else
			ret = drm_copy_io_page(new_iomap, old_iomap, page);
		if (ret)
			goto out1;
	}
	mb();
      out2:
	drm_bo_free_old_node(bo);

	*old_mem = *new_mem;
	new_mem->mm_node = NULL;
	old_mem->mask = save_mask;
	DRM_FLAG_MASKED(save_flags, new_mem->flags, DRM_BO_MASK_MEMTYPE);

	if ((man->flags & _DRM_FLAG_MEMTYPE_FIXED) && (ttm != NULL)) {
		drm_ttm_unbind(ttm);
		drm_destroy_ttm(ttm);
		bo->ttm = NULL;
	}

      out1:
	drm_mem_reg_iounmap(dev, new_mem, new_iomap);
      out:
	drm_mem_reg_iounmap(dev, &old_copy, old_iomap);
	return ret;
}

EXPORT_SYMBOL(drm_bo_move_memcpy);

/*
 * Transfer a buffer object's memory and LRU status to a newly
 * created object. User-space references remains with the old
 * object. Call bo->mutex locked.
 */

int drm_buffer_object_transfer(struct drm_buffer_object * bo,
			       struct drm_buffer_object ** new_obj)
{
	struct drm_buffer_object *fbo;
	struct drm_device *dev = bo->dev;
	struct drm_buffer_manager *bm = &dev->bm;

	fbo = drm_ctl_calloc(1, sizeof(*fbo), DRM_MEM_BUFOBJ);
	if (!fbo)
		return -ENOMEM;

	*fbo = *bo;
	mutex_init(&fbo->mutex);
	mutex_lock(&fbo->mutex);
	mutex_lock(&dev->struct_mutex);

	DRM_INIT_WAITQUEUE(&bo->event_queue);
	INIT_LIST_HEAD(&fbo->ddestroy);
	INIT_LIST_HEAD(&fbo->lru);
	INIT_LIST_HEAD(&fbo->pinned_lru);
#ifdef DRM_ODD_MM_COMPAT
	INIT_LIST_HEAD(&fbo->vma_list);
	INIT_LIST_HEAD(&fbo->p_mm_list);
#endif

	drm_fence_reference_unlocked(&fbo->fence, bo->fence);
	fbo->pinned_node = NULL;
	fbo->mem.mm_node->private = (void *)fbo;
	atomic_set(&fbo->usage, 1);
	atomic_inc(&bm->count);
	mutex_unlock(&dev->struct_mutex);
	mutex_unlock(&fbo->mutex);

	*new_obj = fbo;
	return 0;
}

/*
 * Since move is underway, we need to block signals in this function.
 * We cannot restart until it has finished.
 */

int drm_bo_move_accel_cleanup(struct drm_buffer_object * bo,
			      int evict,
			      int no_wait,
			      uint32_t fence_class,
			      uint32_t fence_type,
			      uint32_t fence_flags, struct drm_bo_mem_reg * new_mem)
{
	struct drm_device *dev = bo->dev;
	struct drm_mem_type_manager *man = &dev->bm.man[new_mem->mem_type];
	struct drm_bo_mem_reg *old_mem = &bo->mem;
	int ret;
	uint64_t save_flags = old_mem->flags;
	uint64_t save_mask = old_mem->mask;
	struct drm_buffer_object *old_obj;

	if (bo->fence)
		drm_fence_usage_deref_unlocked(&bo->fence);
	ret = drm_fence_object_create(dev, fence_class, fence_type,
				      fence_flags | DRM_FENCE_FLAG_EMIT,
				      &bo->fence);
	bo->fence_type = fence_type;
	if (ret)
		return ret;

#ifdef DRM_ODD_MM_COMPAT
	/*
	 * In this mode, we don't allow pipelining a copy blit,
	 * since the buffer will be accessible from user space
	 * the moment we return and rebuild the page tables.
	 *
	 * With normal vm operation, page tables are rebuilt
	 * on demand using fault(), which waits for buffer idle.
	 */
	if (1)
#else
	if (evict || ((bo->mem.mm_node == bo->pinned_node) &&
		      bo->mem.mm_node != NULL))
#endif
	{
		ret = drm_bo_wait(bo, 0, 1, 0);
		if (ret)
			return ret;

		drm_bo_free_old_node(bo);

		if ((man->flags & _DRM_FLAG_MEMTYPE_FIXED) && (bo->ttm != NULL)) {
			drm_ttm_unbind(bo->ttm);
			drm_destroy_ttm(bo->ttm);
			bo->ttm = NULL;
		}
	} else {

		/* This should help pipeline ordinary buffer moves.
		 *
		 * Hang old buffer memory on a new buffer object,
		 * and leave it to be released when the GPU
		 * operation has completed.
		 */

		ret = drm_buffer_object_transfer(bo, &old_obj);

		if (ret)
			return ret;

		if (!(man->flags & _DRM_FLAG_MEMTYPE_FIXED))
			old_obj->ttm = NULL;
		else
			bo->ttm = NULL;

		mutex_lock(&dev->struct_mutex);
		list_del_init(&old_obj->lru);
		DRM_FLAG_MASKED(bo->priv_flags, 0, _DRM_BO_FLAG_UNFENCED);
		drm_bo_add_to_lru(old_obj);

		drm_bo_usage_deref_locked(&old_obj);
		mutex_unlock(&dev->struct_mutex);

	}

	*old_mem = *new_mem;
	new_mem->mm_node = NULL;
	old_mem->mask = save_mask;
	DRM_FLAG_MASKED(save_flags, new_mem->flags, DRM_BO_MASK_MEMTYPE);
	return 0;
}

EXPORT_SYMBOL(drm_bo_move_accel_cleanup);

int drm_bo_same_page(unsigned long offset,
		     unsigned long offset2)
{
	return (offset & PAGE_MASK) == (offset2 & PAGE_MASK);
}
EXPORT_SYMBOL(drm_bo_same_page);

unsigned long drm_bo_offset_end(unsigned long offset,
				unsigned long end)
{

	offset = (offset + PAGE_SIZE) & PAGE_MASK;
	return (end < offset) ? end : offset;
}
EXPORT_SYMBOL(drm_bo_offset_end);


static pgprot_t drm_kernel_io_prot(uint32_t map_type)
{
	pgprot_t tmp = PAGE_KERNEL;

#if defined(__i386__) || defined(__x86_64__)
#ifdef USE_PAT_WC
#warning using pat
	if (drm_use_pat() && map_type == _DRM_TTM) {
		pgprot_val(tmp) |= _PAGE_PAT;
		return tmp;
	}
#endif
	if (boot_cpu_data.x86 > 3 && map_type != _DRM_AGP) {
		pgprot_val(tmp) |= _PAGE_PCD;
		pgprot_val(tmp) &= ~_PAGE_PWT;
	}
#elif defined(__powerpc__)
	pgprot_val(tmp) |= _PAGE_NO_CACHE;
	if (map_type == _DRM_REGISTERS)
		pgprot_val(tmp) |= _PAGE_GUARDED;
#endif
#if defined(__ia64__)
	if (map_type == _DRM_TTM)
		tmp = pgprot_writecombine(tmp);
	else
		tmp = pgprot_noncached(tmp);
#endif
	return tmp;
}

static int drm_bo_ioremap(struct drm_buffer_object *bo, unsigned long bus_base,
			  unsigned long bus_offset, unsigned long bus_size,
			  struct drm_bo_kmap_obj *map)
{
	struct drm_device *dev = bo->dev;
	struct drm_bo_mem_reg *mem = &bo->mem;
	struct drm_mem_type_manager *man = &dev->bm.man[mem->mem_type];

	if (!(man->flags & _DRM_FLAG_NEEDS_IOREMAP)) {
		map->bo_kmap_type = bo_map_premapped;
		map->virtual = (void *)(((u8 *) man->io_addr) + bus_offset);
	} else {
		map->bo_kmap_type = bo_map_iomap;
		map->virtual = ioremap_nocache(bus_base + bus_offset, bus_size);
	}
	return (!map->virtual) ? -ENOMEM : 0;
}

static int drm_bo_kmap_ttm(struct drm_buffer_object *bo, unsigned long start_page,
			   unsigned long num_pages, struct drm_bo_kmap_obj *map)
{
	struct drm_device *dev = bo->dev;
	struct drm_bo_mem_reg *mem = &bo->mem;
	struct drm_mem_type_manager *man = &dev->bm.man[mem->mem_type];
	pgprot_t prot;
	struct drm_ttm *ttm = bo->ttm;
	struct page *d;
	int i;

	BUG_ON(!ttm);

	if (num_pages == 1 && (mem->flags & DRM_BO_FLAG_CACHED)) {

		/*
		 * We're mapping a single page, and the desired
		 * page protection is consistent with the bo.
		 */

		map->bo_kmap_type = bo_map_kmap;
		map->page = drm_ttm_get_page(ttm, start_page);
		map->virtual = kmap(map->page);
	} else {
		/*
		 * Populate the part we're mapping;
		 */

		for (i = start_page; i< start_page + num_pages; ++i) {
			d = drm_ttm_get_page(ttm, i);
			if (!d)
				return -ENOMEM;
		}

		/*
		 * We need to use vmap to get the desired page protection
		 * or to make the buffer object look contigous.
		 */

		prot = (mem->flags & DRM_BO_FLAG_CACHED) ?
			PAGE_KERNEL :
			drm_kernel_io_prot(man->drm_bus_maptype);
		map->bo_kmap_type = bo_map_vmap;
		map->virtual = vmap(ttm->pages + start_page,
				    num_pages, 0, prot);
	}
	return (!map->virtual) ? -ENOMEM : 0;
}

/*
 * This function is to be used for kernel mapping of buffer objects.
 * It chooses the appropriate mapping method depending on the memory type
 * and caching policy the buffer currently has.
 * Mapping multiple pages or buffers that live in io memory is a bit slow and
 * consumes vmalloc space. Be restrictive with such mappings.
 * Mapping single pages usually returns the logical kernel address, (which is fast)
 * BUG may use slower temporary mappings for high memory pages or
 * uncached / write-combined pages.
 *
 * The function fills in a drm_bo_kmap_obj which can be used to return the
 * kernel virtual address of the buffer.
 *
 * Code servicing a non-priviliged user request is only allowed to map one
 * page at a time. We might need to implement a better scheme to stop such
 * processes from consuming all vmalloc space.
 */

int drm_bo_kmap(struct drm_buffer_object *bo, unsigned long start_page,
		unsigned long num_pages, struct drm_bo_kmap_obj *map)
{
	int ret;
	unsigned long bus_base;
	unsigned long bus_offset;
	unsigned long bus_size;

	map->virtual = NULL;

	if (num_pages > bo->num_pages)
		return -EINVAL;
	if (start_page > bo->num_pages)
		return -EINVAL;
#if 0
	if (num_pages > 1 && !DRM_SUSER(DRM_CURPROC))
		return -EPERM;
#endif
	ret = drm_bo_pci_offset(bo->dev, &bo->mem, &bus_base,
				&bus_offset, &bus_size);

	if (ret)
		return ret;

	if (bus_size == 0) {
		return drm_bo_kmap_ttm(bo, start_page, num_pages, map);
	} else {
		bus_offset += start_page << PAGE_SHIFT;
		bus_size = num_pages << PAGE_SHIFT;
		return drm_bo_ioremap(bo, bus_base, bus_offset, bus_size, map);
	}
}
EXPORT_SYMBOL(drm_bo_kmap);

void drm_bo_kunmap(struct drm_bo_kmap_obj *map)
{
	if (!map->virtual)
		return;

	switch(map->bo_kmap_type) {
	case bo_map_iomap:
		iounmap(map->virtual);
		break;
	case bo_map_vmap:
		vunmap(map->virtual);
		break;
	case bo_map_kmap:
		kunmap(map->page);
		break;
	case bo_map_premapped:
		break;
	default:
		BUG();
	}
	map->virtual = NULL;
	map->page = NULL;
}
EXPORT_SYMBOL(drm_bo_kunmap);