summaryrefslogtreecommitdiffstats
path: root/drivers/gpu/drm/virtio/virtgpu_ttm.c
blob: 11f8ae5b53328bde98cf9f2471b9402cd9cea969 (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
/*
 * Copyright (C) 2015 Red Hat, Inc.
 * All Rights Reserved.
 *
 * Authors:
 *    Dave Airlie
 *    Alon Levy
 *
 * 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 <drm/ttm/ttm_bo_api.h>
#include <drm/ttm/ttm_bo_driver.h>
#include <drm/ttm/ttm_placement.h>
#include <drm/ttm/ttm_page_alloc.h>
#include <drm/ttm/ttm_module.h>
#include <drm/drmP.h>
#include <drm/drm.h>
#include <drm/virtgpu_drm.h>
#include "virtgpu_drv.h"

#include <linux/delay.h>

#define DRM_FILE_PAGE_OFFSET (0x100000000ULL >> PAGE_SHIFT)

static struct
virtio_gpu_device *virtio_gpu_get_vgdev(struct ttm_bo_device *bdev)
{
	struct virtio_gpu_mman *mman;
	struct virtio_gpu_device *vgdev;

	mman = container_of(bdev, struct virtio_gpu_mman, bdev);
	vgdev = container_of(mman, struct virtio_gpu_device, mman);
	return vgdev;
}

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

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

static int virtio_gpu_ttm_global_init(struct virtio_gpu_device *vgdev)
{
	struct drm_global_reference *global_ref;
	int r;

	vgdev->mman.mem_global_referenced = false;
	global_ref = &vgdev->mman.mem_global_ref;
	global_ref->global_type = DRM_GLOBAL_TTM_MEM;
	global_ref->size = sizeof(struct ttm_mem_global);
	global_ref->init = &virtio_gpu_ttm_mem_global_init;
	global_ref->release = &virtio_gpu_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;
	}

	vgdev->mman.bo_global_ref.mem_glob =
		vgdev->mman.mem_global_ref.object;
	global_ref = &vgdev->mman.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(&vgdev->mman.mem_global_ref);
		return r;
	}

	vgdev->mman.mem_global_referenced = true;
	return 0;
}

static void virtio_gpu_ttm_global_fini(struct virtio_gpu_device *vgdev)
{
	if (vgdev->mman.mem_global_referenced) {
		drm_global_item_unref(&vgdev->mman.bo_global_ref.ref);
		drm_global_item_unref(&vgdev->mman.mem_global_ref);
		vgdev->mman.mem_global_referenced = false;
	}
}

#if 0
/*
 * Hmm, seems to not do anything useful.  Leftover debug hack?
 * Something like printing pagefaults to kernel log?
 */
static struct vm_operations_struct virtio_gpu_ttm_vm_ops;
static const struct vm_operations_struct *ttm_vm_ops;

static int virtio_gpu_ttm_fault(struct vm_fault *vmf)
{
	struct ttm_buffer_object *bo;
	struct virtio_gpu_device *vgdev;
	int r;

	bo = (struct ttm_buffer_object *)vmf->vma->vm_private_data;
	if (bo == NULL)
		return VM_FAULT_NOPAGE;
	vgdev = virtio_gpu_get_vgdev(bo->bdev);
	r = ttm_vm_ops->fault(vmf);
	return r;
}
#endif

int virtio_gpu_mmap(struct file *filp, struct vm_area_struct *vma)
{
	struct drm_file *file_priv;
	struct virtio_gpu_device *vgdev;
	int r;

	file_priv = filp->private_data;
	vgdev = file_priv->minor->dev->dev_private;
	if (vgdev == NULL) {
		DRM_ERROR(
		 "filp->private_data->minor->dev->dev_private == NULL\n");
		return -EINVAL;
	}
	r = ttm_bo_mmap(filp, vma, &vgdev->mman.bdev);
#if 0
	if (unlikely(r != 0))
		return r;
	if (unlikely(ttm_vm_ops == NULL)) {
		ttm_vm_ops = vma->vm_ops;
		virtio_gpu_ttm_vm_ops = *ttm_vm_ops;
		virtio_gpu_ttm_vm_ops.fault = &virtio_gpu_ttm_fault;
	}
	vma->vm_ops = &virtio_gpu_ttm_vm_ops;
	return 0;
#else
	return r;
#endif
}

static int virtio_gpu_invalidate_caches(struct ttm_bo_device *bdev,
					uint32_t flags)
{
	return 0;
}

static int ttm_bo_man_get_node(struct ttm_mem_type_manager *man,
			       struct ttm_buffer_object *bo,
			       const struct ttm_place *place,
			       struct ttm_mem_reg *mem)
{
	mem->mm_node = (void *)1;
	return 0;
}

static void ttm_bo_man_put_node(struct ttm_mem_type_manager *man,
				struct ttm_mem_reg *mem)
{
	mem->mm_node = (void *)NULL;
}

static int ttm_bo_man_init(struct ttm_mem_type_manager *man,
			   unsigned long p_size)
{
	return 0;
}

static int ttm_bo_man_takedown(struct ttm_mem_type_manager *man)
{
	return 0;
}

static void ttm_bo_man_debug(struct ttm_mem_type_manager *man,
			     struct drm_printer *printer)
{
}

static const struct ttm_mem_type_manager_func virtio_gpu_bo_manager_func = {
	.init = ttm_bo_man_init,
	.takedown = ttm_bo_man_takedown,
	.get_node = ttm_bo_man_get_node,
	.put_node = ttm_bo_man_put_node,
	.debug = ttm_bo_man_debug
};

static int virtio_gpu_init_mem_type(struct ttm_bo_device *bdev, uint32_t type,
				    struct ttm_mem_type_manager *man)
{
	struct virtio_gpu_device *vgdev;

	vgdev = virtio_gpu_get_vgdev(bdev);

	switch (type) {
	case TTM_PL_SYSTEM:
		/* System memory */
		man->flags = TTM_MEMTYPE_FLAG_MAPPABLE;
		man->available_caching = TTM_PL_MASK_CACHING;
		man->default_caching = TTM_PL_FLAG_CACHED;
		break;
	case TTM_PL_TT:
		man->func = &virtio_gpu_bo_manager_func;
		man->flags = TTM_MEMTYPE_FLAG_MAPPABLE;
		man->available_caching = TTM_PL_MASK_CACHING;
		man->default_caching = TTM_PL_FLAG_CACHED;
		break;
	default:
		DRM_ERROR("Unsupported memory type %u\n", (unsigned int)type);
		return -EINVAL;
	}
	return 0;
}

static void virtio_gpu_evict_flags(struct ttm_buffer_object *bo,
				struct ttm_placement *placement)
{
	static const struct ttm_place placements = {
		.fpfn  = 0,
		.lpfn  = 0,
		.flags = TTM_PL_MASK_CACHING | TTM_PL_FLAG_SYSTEM,
	};

	placement->placement = &placements;
	placement->busy_placement = &placements;
	placement->num_placement = 1;
	placement->num_busy_placement = 1;
}

static int virtio_gpu_verify_access(struct ttm_buffer_object *bo,
				    struct file *filp)
{
	return 0;
}

static int virtio_gpu_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];

	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:
	case TTM_PL_TT:
		/* system memory */
		return 0;
	default:
		return -EINVAL;
	}
	return 0;
}

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

/*
 * TTM backend functions.
 */
struct virtio_gpu_ttm_tt {
	struct ttm_dma_tt		ttm;
	struct virtio_gpu_device	*vgdev;
	u64				offset;
};

static int virtio_gpu_ttm_backend_bind(struct ttm_tt *ttm,
				       struct ttm_mem_reg *bo_mem)
{
	struct virtio_gpu_ttm_tt *gtt = (void *)ttm;

	gtt->offset = (unsigned long)(bo_mem->start << PAGE_SHIFT);
	if (!ttm->num_pages)
		WARN(1, "nothing to bind %lu pages for mreg %p back %p!\n",
		     ttm->num_pages, bo_mem, ttm);

	/* Not implemented */
	return 0;
}

static int virtio_gpu_ttm_backend_unbind(struct ttm_tt *ttm)
{
	/* Not implemented */
	return 0;
}

static void virtio_gpu_ttm_backend_destroy(struct ttm_tt *ttm)
{
	struct virtio_gpu_ttm_tt *gtt = (void *)ttm;

	ttm_dma_tt_fini(&gtt->ttm);
	kfree(gtt);
}

static struct ttm_backend_func virtio_gpu_backend_func = {
	.bind = &virtio_gpu_ttm_backend_bind,
	.unbind = &virtio_gpu_ttm_backend_unbind,
	.destroy = &virtio_gpu_ttm_backend_destroy,
};

static struct ttm_tt *virtio_gpu_ttm_tt_create(struct ttm_buffer_object *bo,
					       uint32_t page_flags)
{
	struct virtio_gpu_device *vgdev;
	struct virtio_gpu_ttm_tt *gtt;

	vgdev = virtio_gpu_get_vgdev(bo->bdev);
	gtt = kzalloc(sizeof(struct virtio_gpu_ttm_tt), GFP_KERNEL);
	if (gtt == NULL)
		return NULL;
	gtt->ttm.ttm.func = &virtio_gpu_backend_func;
	gtt->vgdev = vgdev;
	if (ttm_dma_tt_init(&gtt->ttm, bo, page_flags)) {
		kfree(gtt);
		return NULL;
	}
	return &gtt->ttm.ttm;
}

static void virtio_gpu_move_null(struct ttm_buffer_object *bo,
				 struct ttm_mem_reg *new_mem)
{
	struct ttm_mem_reg *old_mem = &bo->mem;

	BUG_ON(old_mem->mm_node != NULL);
	*old_mem = *new_mem;
	new_mem->mm_node = NULL;
}

static int virtio_gpu_bo_move(struct ttm_buffer_object *bo, bool evict,
			      struct ttm_operation_ctx *ctx,
			      struct ttm_mem_reg *new_mem)
{
	int ret;

	ret = ttm_bo_wait(bo, ctx->interruptible, ctx->no_wait_gpu);
	if (ret)
		return ret;

	virtio_gpu_move_null(bo, new_mem);
	return 0;
}

static void virtio_gpu_bo_move_notify(struct ttm_buffer_object *tbo,
				      bool evict,
				      struct ttm_mem_reg *new_mem)
{
	struct virtio_gpu_object *bo;
	struct virtio_gpu_device *vgdev;

	bo = container_of(tbo, struct virtio_gpu_object, tbo);
	vgdev = (struct virtio_gpu_device *)bo->gem_base.dev->dev_private;

	if (!new_mem || (new_mem->placement & TTM_PL_FLAG_SYSTEM)) {
		if (bo->hw_res_handle)
			virtio_gpu_cmd_resource_inval_backing(vgdev,
							   bo->hw_res_handle);

	} else if (new_mem->placement & TTM_PL_FLAG_TT) {
		if (bo->hw_res_handle) {
			virtio_gpu_object_attach(vgdev, bo, bo->hw_res_handle,
						 NULL);
		}
	}
}

static void virtio_gpu_bo_swap_notify(struct ttm_buffer_object *tbo)
{
	struct virtio_gpu_object *bo;
	struct virtio_gpu_device *vgdev;

	bo = container_of(tbo, struct virtio_gpu_object, tbo);
	vgdev = (struct virtio_gpu_device *)bo->gem_base.dev->dev_private;

	if (bo->pages)
		virtio_gpu_object_free_sg_table(bo);
}

static struct ttm_bo_driver virtio_gpu_bo_driver = {
	.ttm_tt_create = &virtio_gpu_ttm_tt_create,
	.invalidate_caches = &virtio_gpu_invalidate_caches,
	.init_mem_type = &virtio_gpu_init_mem_type,
	.eviction_valuable = ttm_bo_eviction_valuable,
	.evict_flags = &virtio_gpu_evict_flags,
	.move = &virtio_gpu_bo_move,
	.verify_access = &virtio_gpu_verify_access,
	.io_mem_reserve = &virtio_gpu_ttm_io_mem_reserve,
	.io_mem_free = &virtio_gpu_ttm_io_mem_free,
	.move_notify = &virtio_gpu_bo_move_notify,
	.swap_notify = &virtio_gpu_bo_swap_notify,
};

int virtio_gpu_ttm_init(struct virtio_gpu_device *vgdev)
{
	int r;

	r = virtio_gpu_ttm_global_init(vgdev);
	if (r)
		return r;
	/* No others user of address space so set it to 0 */
	r = ttm_bo_device_init(&vgdev->mman.bdev,
			       vgdev->mman.bo_global_ref.ref.object,
			       &virtio_gpu_bo_driver,
			       vgdev->ddev->anon_inode->i_mapping,
			       DRM_FILE_PAGE_OFFSET, 0);
	if (r) {
		DRM_ERROR("failed initializing buffer object driver(%d).\n", r);
		goto err_dev_init;
	}

	r = ttm_bo_init_mm(&vgdev->mman.bdev, TTM_PL_TT, 0);
	if (r) {
		DRM_ERROR("Failed initializing GTT heap.\n");
		goto err_mm_init;
	}
	return 0;

err_mm_init:
	ttm_bo_device_release(&vgdev->mman.bdev);
err_dev_init:
	virtio_gpu_ttm_global_fini(vgdev);
	return r;
}

void virtio_gpu_ttm_fini(struct virtio_gpu_device *vgdev)
{
	ttm_bo_device_release(&vgdev->mman.bdev);
	virtio_gpu_ttm_global_fini(vgdev);
	DRM_INFO("virtio_gpu: ttm finalized\n");
}