summaryrefslogtreecommitdiff
path: root/drivers/gpu/drm/bochs/bochs_mm.c
blob: c4cadb638460eb86f06488f4ab5f8a75d3be8701 (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
/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

#include "bochs.h"

static void bochs_ttm_placement(struct bochs_bo *bo, int domain);

/* ---------------------------------------------------------------------- */

static inline struct bochs_device *bochs_bdev(struct ttm_bo_device *bd)
{
	return container_of(bd, struct bochs_device, ttm.bdev);
}

static int bochs_ttm_mem_global_init(struct drm_global_reference *ref)
{
	return ttm_mem_global_init(ref->object);
}

static void bochs_ttm_mem_global_release(struct drm_global_reference *ref)
{
	ttm_mem_global_release(ref->object);
}

static int bochs_ttm_global_init(struct bochs_device *bochs)
{
	struct drm_global_reference *global_ref;
	int r;

	global_ref = &bochs->ttm.mem_global_ref;
	global_ref->global_type = DRM_GLOBAL_TTM_MEM;
	global_ref->size = sizeof(struct ttm_mem_global);
	global_ref->init = &bochs_ttm_mem_global_init;
	global_ref->release = &bochs_ttm_mem_global_release;
	r = drm_global_item_ref(global_ref);
	if (r != 0) {
		DRM_ERROR("Failed setting up TTM memory accounting "
			  "subsystem.\n");
		return r;
	}

	bochs->ttm.bo_global_ref.mem_glob =
		bochs->ttm.mem_global_ref.object;
	global_ref = &bochs->ttm.bo_global_ref.ref;
	global_ref->global_type = DRM_GLOBAL_TTM_BO;
	global_ref->size = sizeof(struct ttm_bo_global);
	global_ref->init = &ttm_bo_global_init;
	global_ref->release = &ttm_bo_global_release;
	r = drm_global_item_ref(global_ref);
	if (r != 0) {
		DRM_ERROR("Failed setting up TTM BO subsystem.\n");
		drm_global_item_unref(&bochs->ttm.mem_global_ref);
		return r;
	}

	return 0;
}

static void bochs_ttm_global_release(struct bochs_device *bochs)
{
	if (bochs->ttm.mem_global_ref.release == NULL)
		return;

	drm_global_item_unref(&bochs->ttm.bo_global_ref.ref);
	drm_global_item_unref(&bochs->ttm.mem_global_ref);
	bochs->ttm.mem_global_ref.release = NULL;
}


static void bochs_bo_ttm_destroy(struct ttm_buffer_object *tbo)
{
	struct bochs_bo *bo;

	bo = container_of(tbo, struct bochs_bo, bo);
	drm_gem_object_release(&bo->gem);
	kfree(bo);
}

static bool bochs_ttm_bo_is_bochs_bo(struct ttm_buffer_object *bo)
{
	if (bo->destroy == &bochs_bo_ttm_destroy)
		return true;
	return false;
}

static int bochs_bo_init_mem_type(struct ttm_bo_device *bdev, uint32_t type,
				  struct ttm_mem_type_manager *man)
{
	switch (type) {
	case TTM_PL_SYSTEM:
		man->flags = TTM_MEMTYPE_FLAG_MAPPABLE;
		man->available_caching = TTM_PL_MASK_CACHING;
		man->default_caching = TTM_PL_FLAG_CACHED;
		break;
	case TTM_PL_VRAM:
		man->func = &ttm_bo_manager_func;
		man->flags = TTM_MEMTYPE_FLAG_FIXED |
			TTM_MEMTYPE_FLAG_MAPPABLE;
		man->available_caching = TTM_PL_FLAG_UNCACHED |
			TTM_PL_FLAG_WC;
		man->default_caching = TTM_PL_FLAG_WC;
		break;
	default:
		DRM_ERROR("Unsupported memory type %u\n", (unsigned)type);
		return -EINVAL;
	}
	return 0;
}

static void
bochs_bo_evict_flags(struct ttm_buffer_object *bo, struct ttm_placement *pl)
{
	struct bochs_bo *bochsbo = bochs_bo(bo);

	if (!bochs_ttm_bo_is_bochs_bo(bo))
		return;

	bochs_ttm_placement(bochsbo, TTM_PL_FLAG_SYSTEM);
	*pl = bochsbo->placement;
}

static int bochs_bo_verify_access(struct ttm_buffer_object *bo,
				  struct file *filp)
{
	struct bochs_bo *bochsbo = bochs_bo(bo);

	return drm_vma_node_verify_access(&bochsbo->gem.vma_node,
					  filp->private_data);
}

static int bochs_ttm_io_mem_reserve(struct ttm_bo_device *bdev,
				    struct ttm_mem_reg *mem)
{
	struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
	struct bochs_device *bochs = bochs_bdev(bdev);

	mem->bus.addr = NULL;
	mem->bus.offset = 0;
	mem->bus.size = mem->num_pages << PAGE_SHIFT;
	mem->bus.base = 0;
	mem->bus.is_iomem = false;
	if (!(man->flags & TTM_MEMTYPE_FLAG_MAPPABLE))
		return -EINVAL;
	switch (mem->mem_type) {
	case TTM_PL_SYSTEM:
		/* system memory */
		return 0;
	case TTM_PL_VRAM:
		mem->bus.offset = mem->start << PAGE_SHIFT;
		mem->bus.base = bochs->fb_base;
		mem->bus.is_iomem = true;
		break;
	default:
		return -EINVAL;
		break;
	}
	return 0;
}

static void bochs_ttm_io_mem_free(struct ttm_bo_device *bdev,
				  struct ttm_mem_reg *mem)
{
}

static void bochs_ttm_backend_destroy(struct ttm_tt *tt)
{
	ttm_tt_fini(tt);
	kfree(tt);
}

static struct ttm_backend_func bochs_tt_backend_func = {
	.destroy = &bochs_ttm_backend_destroy,
};

static struct ttm_tt *bochs_ttm_tt_create(struct ttm_bo_device *bdev,
					  unsigned long size,
					  uint32_t page_flags,
					  struct page *dummy_read_page)
{
	struct ttm_tt *tt;

	tt = kzalloc(sizeof(struct ttm_tt), GFP_KERNEL);
	if (tt == NULL)
		return NULL;
	tt->func = &bochs_tt_backend_func;
	if (ttm_tt_init(tt, bdev, size, page_flags, dummy_read_page)) {
		kfree(tt);
		return NULL;
	}
	return tt;
}

struct ttm_bo_driver bochs_bo_driver = {
	.ttm_tt_create = bochs_ttm_tt_create,
	.ttm_tt_populate = ttm_pool_populate,
	.ttm_tt_unpopulate = ttm_pool_unpopulate,
	.init_mem_type = bochs_bo_init_mem_type,
	.eviction_valuable = ttm_bo_eviction_valuable,
	.evict_flags = bochs_bo_evict_flags,
	.move = NULL,
	.verify_access = bochs_bo_verify_access,
	.io_mem_reserve = &bochs_ttm_io_mem_reserve,
	.io_mem_free = &bochs_ttm_io_mem_free,
	.io_mem_pfn = ttm_bo_default_io_mem_pfn,
};

int bochs_mm_init(struct bochs_device *bochs)
{
	struct ttm_bo_device *bdev = &bochs->ttm.bdev;
	int ret;

	ret = bochs_ttm_global_init(bochs);
	if (ret)
		return ret;

	ret = ttm_bo_device_init(&bochs->ttm.bdev,
				 bochs->ttm.bo_global_ref.ref.object,
				 &bochs_bo_driver,
				 bochs->dev->anon_inode->i_mapping,
				 DRM_FILE_PAGE_OFFSET,
				 true);
	if (ret) {
		DRM_ERROR("Error initialising bo driver; %d\n", ret);
		return ret;
	}

	ret = ttm_bo_init_mm(bdev, TTM_PL_VRAM,
			     bochs->fb_size >> PAGE_SHIFT);
	if (ret) {
		DRM_ERROR("Failed ttm VRAM init: %d\n", ret);
		return ret;
	}

	bochs->ttm.initialized = true;
	return 0;
}

void bochs_mm_fini(struct bochs_device *bochs)
{
	if (!bochs->ttm.initialized)
		return;

	ttm_bo_device_release(&bochs->ttm.bdev);
	bochs_ttm_global_release(bochs);
	bochs->ttm.initialized = false;
}

static void bochs_ttm_placement(struct bochs_bo *bo, int domain)
{
	unsigned i;
	u32 c = 0;
	bo->placement.placement = bo->placements;
	bo->placement.busy_placement = bo->placements;
	if (domain & TTM_PL_FLAG_VRAM) {
		bo->placements[c++].flags = TTM_PL_FLAG_WC
			| TTM_PL_FLAG_UNCACHED
			| TTM_PL_FLAG_VRAM;
	}
	if (domain & TTM_PL_FLAG_SYSTEM) {
		bo->placements[c++].flags = TTM_PL_MASK_CACHING
			| TTM_PL_FLAG_SYSTEM;
	}
	if (!c) {
		bo->placements[c++].flags = TTM_PL_MASK_CACHING
			| TTM_PL_FLAG_SYSTEM;
	}
	for (i = 0; i < c; ++i) {
		bo->placements[i].fpfn = 0;
		bo->placements[i].lpfn = 0;
	}
	bo->placement.num_placement = c;
	bo->placement.num_busy_placement = c;
}

static inline u64 bochs_bo_gpu_offset(struct bochs_bo *bo)
{
	return bo->bo.offset;
}

int bochs_bo_pin(struct bochs_bo *bo, u32 pl_flag, u64 *gpu_addr)
{
	int i, ret;

	if (bo->pin_count) {
		bo->pin_count++;
		if (gpu_addr)
			*gpu_addr = bochs_bo_gpu_offset(bo);
		return 0;
	}

	bochs_ttm_placement(bo, pl_flag);
	for (i = 0; i < bo->placement.num_placement; i++)
		bo->placements[i].flags |= TTM_PL_FLAG_NO_EVICT;
	ret = ttm_bo_validate(&bo->bo, &bo->placement, false, false);
	if (ret)
		return ret;

	bo->pin_count = 1;
	if (gpu_addr)
		*gpu_addr = bochs_bo_gpu_offset(bo);
	return 0;
}

int bochs_bo_unpin(struct bochs_bo *bo)
{
	int i, ret;

	if (!bo->pin_count) {
		DRM_ERROR("unpin bad %p\n", bo);
		return 0;
	}
	bo->pin_count--;

	if (bo->pin_count)
		return 0;

	for (i = 0; i < bo->placement.num_placement; i++)
		bo->placements[i].flags &= ~TTM_PL_FLAG_NO_EVICT;
	ret = ttm_bo_validate(&bo->bo, &bo->placement, false, false);
	if (ret)
		return ret;

	return 0;
}

int bochs_mmap(struct file *filp, struct vm_area_struct *vma)
{
	struct drm_file *file_priv;
	struct bochs_device *bochs;

	if (unlikely(vma->vm_pgoff < DRM_FILE_PAGE_OFFSET))
		return -EINVAL;

	file_priv = filp->private_data;
	bochs = file_priv->minor->dev->dev_private;
	return ttm_bo_mmap(filp, vma, &bochs->ttm.bdev);
}

/* ---------------------------------------------------------------------- */

static int bochs_bo_create(struct drm_device *dev, int size, int align,
			   uint32_t flags, struct bochs_bo **pbochsbo)
{
	struct bochs_device *bochs = dev->dev_private;
	struct bochs_bo *bochsbo;
	size_t acc_size;
	int ret;

	bochsbo = kzalloc(sizeof(struct bochs_bo), GFP_KERNEL);
	if (!bochsbo)
		return -ENOMEM;

	ret = drm_gem_object_init(dev, &bochsbo->gem, size);
	if (ret) {
		kfree(bochsbo);
		return ret;
	}

	bochsbo->bo.bdev = &bochs->ttm.bdev;
	bochsbo->bo.bdev->dev_mapping = dev->anon_inode->i_mapping;

	bochs_ttm_placement(bochsbo, TTM_PL_FLAG_VRAM | TTM_PL_FLAG_SYSTEM);

	acc_size = ttm_bo_dma_acc_size(&bochs->ttm.bdev, size,
				       sizeof(struct bochs_bo));

	ret = ttm_bo_init(&bochs->ttm.bdev, &bochsbo->bo, size,
			  ttm_bo_type_device, &bochsbo->placement,
			  align >> PAGE_SHIFT, false, NULL, acc_size,
			  NULL, NULL, bochs_bo_ttm_destroy);
	if (ret)
		return ret;

	*pbochsbo = bochsbo;
	return 0;
}

int bochs_gem_create(struct drm_device *dev, u32 size, bool iskernel,
		     struct drm_gem_object **obj)
{
	struct bochs_bo *bochsbo;
	int ret;

	*obj = NULL;

	size = PAGE_ALIGN(size);
	if (size == 0)
		return -EINVAL;

	ret = bochs_bo_create(dev, size, 0, 0, &bochsbo);
	if (ret) {
		if (ret != -ERESTARTSYS)
			DRM_ERROR("failed to allocate GEM object\n");
		return ret;
	}
	*obj = &bochsbo->gem;
	return 0;
}

int bochs_dumb_create(struct drm_file *file, struct drm_device *dev,
		      struct drm_mode_create_dumb *args)
{
	struct drm_gem_object *gobj;
	u32 handle;
	int ret;

	args->pitch = args->width * ((args->bpp + 7) / 8);
	args->size = args->pitch * args->height;

	ret = bochs_gem_create(dev, args->size, false,
			       &gobj);
	if (ret)
		return ret;

	ret = drm_gem_handle_create(file, gobj, &handle);
	drm_gem_object_unreference_unlocked(gobj);
	if (ret)
		return ret;

	args->handle = handle;
	return 0;
}

static void bochs_bo_unref(struct bochs_bo **bo)
{
	struct ttm_buffer_object *tbo;

	if ((*bo) == NULL)
		return;

	tbo = &((*bo)->bo);
	ttm_bo_unref(&tbo);
	*bo = NULL;
}

void bochs_gem_free_object(struct drm_gem_object *obj)
{
	struct bochs_bo *bochs_bo = gem_to_bochs_bo(obj);

	bochs_bo_unref(&bochs_bo);
}

int bochs_dumb_mmap_offset(struct drm_file *file, struct drm_device *dev,
			   uint32_t handle, uint64_t *offset)
{
	struct drm_gem_object *obj;
	struct bochs_bo *bo;

	obj = drm_gem_object_lookup(file, handle);
	if (obj == NULL)
		return -ENOENT;

	bo = gem_to_bochs_bo(obj);
	*offset = bochs_bo_mmap_offset(bo);

	drm_gem_object_unreference_unlocked(obj);
	return 0;
}

/* ---------------------------------------------------------------------- */

static void bochs_user_framebuffer_destroy(struct drm_framebuffer *fb)
{
	struct bochs_framebuffer *bochs_fb = to_bochs_framebuffer(fb);

	drm_gem_object_unreference_unlocked(bochs_fb->obj);
	drm_framebuffer_cleanup(fb);
	kfree(fb);
}

static const struct drm_framebuffer_funcs bochs_fb_funcs = {
	.destroy = bochs_user_framebuffer_destroy,
};

int bochs_framebuffer_init(struct drm_device *dev,
			   struct bochs_framebuffer *gfb,
			   const struct drm_mode_fb_cmd2 *mode_cmd,
			   struct drm_gem_object *obj)
{
	int ret;

	drm_helper_mode_fill_fb_struct(dev, &gfb->base, mode_cmd);
	gfb->obj = obj;
	ret = drm_framebuffer_init(dev, &gfb->base, &bochs_fb_funcs);
	if (ret) {
		DRM_ERROR("drm_framebuffer_init failed: %d\n", ret);
		return ret;
	}
	return 0;
}

static struct drm_framebuffer *
bochs_user_framebuffer_create(struct drm_device *dev,
			      struct drm_file *filp,
			      const struct drm_mode_fb_cmd2 *mode_cmd)
{
	struct drm_gem_object *obj;
	struct bochs_framebuffer *bochs_fb;
	int ret;

	DRM_DEBUG_DRIVER("%dx%d, format %c%c%c%c\n",
	       mode_cmd->width, mode_cmd->height,
	       (mode_cmd->pixel_format)       & 0xff,
	       (mode_cmd->pixel_format >> 8)  & 0xff,
	       (mode_cmd->pixel_format >> 16) & 0xff,
	       (mode_cmd->pixel_format >> 24) & 0xff);

	if (mode_cmd->pixel_format != DRM_FORMAT_XRGB8888)
		return ERR_PTR(-ENOENT);

	obj = drm_gem_object_lookup(filp, mode_cmd->handles[0]);
	if (obj == NULL)
		return ERR_PTR(-ENOENT);

	bochs_fb = kzalloc(sizeof(*bochs_fb), GFP_KERNEL);
	if (!bochs_fb) {
		drm_gem_object_unreference_unlocked(obj);
		return ERR_PTR(-ENOMEM);
	}

	ret = bochs_framebuffer_init(dev, bochs_fb, mode_cmd, obj);
	if (ret) {
		drm_gem_object_unreference_unlocked(obj);
		kfree(bochs_fb);
		return ERR_PTR(ret);
	}
	return &bochs_fb->base;
}

const struct drm_mode_config_funcs bochs_mode_funcs = {
	.fb_create = bochs_user_framebuffer_create,
};