summaryrefslogtreecommitdiff
path: root/drivers/gpu/drm/exynos/exynos_drm_gem.c
blob: 7777f19c9d38ff879434140ff44ce44f45c448db (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
// SPDX-License-Identifier: GPL-2.0-or-later
/* exynos_drm_gem.c
 *
 * Copyright (c) 2011 Samsung Electronics Co., Ltd.
 * Author: Inki Dae <inki.dae@samsung.com>
 */


#include <linux/dma-buf.h>
#include <linux/pfn_t.h>
#include <linux/shmem_fs.h>

#include <drm/drm_prime.h>
#include <drm/drm_vma_manager.h>
#include <drm/exynos_drm.h>

#include "exynos_drm_drv.h"
#include "exynos_drm_gem.h"

static int exynos_drm_alloc_buf(struct exynos_drm_gem *exynos_gem, bool kvmap)
{
	struct drm_device *dev = exynos_gem->base.dev;
	unsigned long attr = 0;

	if (exynos_gem->dma_addr) {
		DRM_DEV_DEBUG_KMS(to_dma_dev(dev), "already allocated.\n");
		return 0;
	}

	/*
	 * if EXYNOS_BO_CONTIG, fully physically contiguous memory
	 * region will be allocated else physically contiguous
	 * as possible.
	 */
	if (!(exynos_gem->flags & EXYNOS_BO_NONCONTIG))
		attr |= DMA_ATTR_FORCE_CONTIGUOUS;

	/*
	 * if EXYNOS_BO_WC or EXYNOS_BO_NONCACHABLE, writecombine mapping
	 * else cachable mapping.
	 */
	if (exynos_gem->flags & EXYNOS_BO_WC ||
			!(exynos_gem->flags & EXYNOS_BO_CACHABLE))
		attr |= DMA_ATTR_WRITE_COMBINE;

	/* FBDev emulation requires kernel mapping */
	if (!kvmap)
		attr |= DMA_ATTR_NO_KERNEL_MAPPING;

	exynos_gem->dma_attrs = attr;
	exynos_gem->cookie = dma_alloc_attrs(to_dma_dev(dev), exynos_gem->size,
					     &exynos_gem->dma_addr, GFP_KERNEL,
					     exynos_gem->dma_attrs);
	if (!exynos_gem->cookie) {
		DRM_DEV_ERROR(to_dma_dev(dev), "failed to allocate buffer.\n");
		return -ENOMEM;
	}

	if (kvmap)
		exynos_gem->kvaddr = exynos_gem->cookie;

	DRM_DEV_DEBUG_KMS(to_dma_dev(dev), "dma_addr(0x%lx), size(0x%lx)\n",
			(unsigned long)exynos_gem->dma_addr, exynos_gem->size);
	return 0;
}

static void exynos_drm_free_buf(struct exynos_drm_gem *exynos_gem)
{
	struct drm_device *dev = exynos_gem->base.dev;

	if (!exynos_gem->dma_addr) {
		DRM_DEV_DEBUG_KMS(dev->dev, "dma_addr is invalid.\n");
		return;
	}

	DRM_DEV_DEBUG_KMS(dev->dev, "dma_addr(0x%lx), size(0x%lx)\n",
			(unsigned long)exynos_gem->dma_addr, exynos_gem->size);

	dma_free_attrs(to_dma_dev(dev), exynos_gem->size, exynos_gem->cookie,
			(dma_addr_t)exynos_gem->dma_addr,
			exynos_gem->dma_attrs);
}

static int exynos_drm_gem_handle_create(struct drm_gem_object *obj,
					struct drm_file *file_priv,
					unsigned int *handle)
{
	int ret;

	/*
	 * allocate a id of idr table where the obj is registered
	 * and handle has the id what user can see.
	 */
	ret = drm_gem_handle_create(file_priv, obj, handle);
	if (ret)
		return ret;

	DRM_DEV_DEBUG_KMS(to_dma_dev(obj->dev), "gem handle = 0x%x\n", *handle);

	/* drop reference from allocate - handle holds it now. */
	drm_gem_object_put(obj);

	return 0;
}

void exynos_drm_gem_destroy(struct exynos_drm_gem *exynos_gem)
{
	struct drm_gem_object *obj = &exynos_gem->base;

	DRM_DEV_DEBUG_KMS(to_dma_dev(obj->dev), "handle count = %d\n",
			  obj->handle_count);

	/*
	 * do not release memory region from exporter.
	 *
	 * the region will be released by exporter
	 * once dmabuf's refcount becomes 0.
	 */
	if (obj->import_attach)
		drm_prime_gem_destroy(obj, exynos_gem->sgt);
	else
		exynos_drm_free_buf(exynos_gem);

	/* release file pointer to gem object. */
	drm_gem_object_release(obj);

	kfree(exynos_gem);
}

static struct exynos_drm_gem *exynos_drm_gem_init(struct drm_device *dev,
						  unsigned long size)
{
	struct exynos_drm_gem *exynos_gem;
	struct drm_gem_object *obj;
	int ret;

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

	exynos_gem->size = size;
	obj = &exynos_gem->base;

	ret = drm_gem_object_init(dev, obj, size);
	if (ret < 0) {
		DRM_DEV_ERROR(dev->dev, "failed to initialize gem object\n");
		kfree(exynos_gem);
		return ERR_PTR(ret);
	}

	ret = drm_gem_create_mmap_offset(obj);
	if (ret < 0) {
		drm_gem_object_release(obj);
		kfree(exynos_gem);
		return ERR_PTR(ret);
	}

	DRM_DEV_DEBUG_KMS(dev->dev, "created file object = %pK\n", obj->filp);

	return exynos_gem;
}

struct exynos_drm_gem *exynos_drm_gem_create(struct drm_device *dev,
					     unsigned int flags,
					     unsigned long size,
					     bool kvmap)
{
	struct exynos_drm_gem *exynos_gem;
	int ret;

	if (flags & ~(EXYNOS_BO_MASK)) {
		DRM_DEV_ERROR(dev->dev,
			      "invalid GEM buffer flags: %u\n", flags);
		return ERR_PTR(-EINVAL);
	}

	if (!size) {
		DRM_DEV_ERROR(dev->dev, "invalid GEM buffer size: %lu\n", size);
		return ERR_PTR(-EINVAL);
	}

	size = roundup(size, PAGE_SIZE);

	exynos_gem = exynos_drm_gem_init(dev, size);
	if (IS_ERR(exynos_gem))
		return exynos_gem;

	if (!is_drm_iommu_supported(dev) && (flags & EXYNOS_BO_NONCONTIG)) {
		/*
		 * when no IOMMU is available, all allocated buffers are
		 * contiguous anyway, so drop EXYNOS_BO_NONCONTIG flag
		 */
		flags &= ~EXYNOS_BO_NONCONTIG;
		DRM_WARN("Non-contiguous allocation is not supported without IOMMU, falling back to contiguous buffer\n");
	}

	/* set memory type and cache attribute from user side. */
	exynos_gem->flags = flags;

	ret = exynos_drm_alloc_buf(exynos_gem, kvmap);
	if (ret < 0) {
		drm_gem_object_release(&exynos_gem->base);
		kfree(exynos_gem);
		return ERR_PTR(ret);
	}

	return exynos_gem;
}

int exynos_drm_gem_create_ioctl(struct drm_device *dev, void *data,
				struct drm_file *file_priv)
{
	struct drm_exynos_gem_create *args = data;
	struct exynos_drm_gem *exynos_gem;
	int ret;

	exynos_gem = exynos_drm_gem_create(dev, args->flags, args->size, false);
	if (IS_ERR(exynos_gem))
		return PTR_ERR(exynos_gem);

	ret = exynos_drm_gem_handle_create(&exynos_gem->base, file_priv,
					   &args->handle);
	if (ret) {
		exynos_drm_gem_destroy(exynos_gem);
		return ret;
	}

	return 0;
}

int exynos_drm_gem_map_ioctl(struct drm_device *dev, void *data,
			     struct drm_file *file_priv)
{
	struct drm_exynos_gem_map *args = data;

	return drm_gem_dumb_map_offset(file_priv, dev, args->handle,
				       &args->offset);
}

struct exynos_drm_gem *exynos_drm_gem_get(struct drm_file *filp,
					  unsigned int gem_handle)
{
	struct drm_gem_object *obj;

	obj = drm_gem_object_lookup(filp, gem_handle);
	if (!obj)
		return NULL;
	return to_exynos_gem(obj);
}

static int exynos_drm_gem_mmap_buffer(struct exynos_drm_gem *exynos_gem,
				      struct vm_area_struct *vma)
{
	struct drm_device *drm_dev = exynos_gem->base.dev;
	unsigned long vm_size;
	int ret;

	vma->vm_flags &= ~VM_PFNMAP;
	vma->vm_pgoff = 0;

	vm_size = vma->vm_end - vma->vm_start;

	/* check if user-requested size is valid. */
	if (vm_size > exynos_gem->size)
		return -EINVAL;

	ret = dma_mmap_attrs(to_dma_dev(drm_dev), vma, exynos_gem->cookie,
			     exynos_gem->dma_addr, exynos_gem->size,
			     exynos_gem->dma_attrs);
	if (ret < 0) {
		DRM_ERROR("failed to mmap.\n");
		return ret;
	}

	return 0;
}

int exynos_drm_gem_get_ioctl(struct drm_device *dev, void *data,
				      struct drm_file *file_priv)
{
	struct exynos_drm_gem *exynos_gem;
	struct drm_exynos_gem_info *args = data;
	struct drm_gem_object *obj;

	obj = drm_gem_object_lookup(file_priv, args->handle);
	if (!obj) {
		DRM_DEV_ERROR(dev->dev, "failed to lookup gem object.\n");
		return -EINVAL;
	}

	exynos_gem = to_exynos_gem(obj);

	args->flags = exynos_gem->flags;
	args->size = exynos_gem->size;

	drm_gem_object_put(obj);

	return 0;
}

void exynos_drm_gem_free_object(struct drm_gem_object *obj)
{
	exynos_drm_gem_destroy(to_exynos_gem(obj));
}

int exynos_drm_gem_dumb_create(struct drm_file *file_priv,
			       struct drm_device *dev,
			       struct drm_mode_create_dumb *args)
{
	struct exynos_drm_gem *exynos_gem;
	unsigned int flags;
	int ret;

	/*
	 * allocate memory to be used for framebuffer.
	 * - this callback would be called by user application
	 *	with DRM_IOCTL_MODE_CREATE_DUMB command.
	 */

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

	if (is_drm_iommu_supported(dev))
		flags = EXYNOS_BO_NONCONTIG | EXYNOS_BO_WC;
	else
		flags = EXYNOS_BO_CONTIG | EXYNOS_BO_WC;

	exynos_gem = exynos_drm_gem_create(dev, flags, args->size, false);
	if (IS_ERR(exynos_gem)) {
		dev_warn(dev->dev, "FB allocation failed.\n");
		return PTR_ERR(exynos_gem);
	}

	ret = exynos_drm_gem_handle_create(&exynos_gem->base, file_priv,
					   &args->handle);
	if (ret) {
		exynos_drm_gem_destroy(exynos_gem);
		return ret;
	}

	return 0;
}

static int exynos_drm_gem_mmap_obj(struct drm_gem_object *obj,
				   struct vm_area_struct *vma)
{
	struct exynos_drm_gem *exynos_gem = to_exynos_gem(obj);
	int ret;

	DRM_DEV_DEBUG_KMS(to_dma_dev(obj->dev), "flags = 0x%x\n",
			  exynos_gem->flags);

	/* non-cachable as default. */
	if (exynos_gem->flags & EXYNOS_BO_CACHABLE)
		vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
	else if (exynos_gem->flags & EXYNOS_BO_WC)
		vma->vm_page_prot =
			pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
	else
		vma->vm_page_prot =
			pgprot_noncached(vm_get_page_prot(vma->vm_flags));

	ret = exynos_drm_gem_mmap_buffer(exynos_gem, vma);
	if (ret)
		goto err_close_vm;

	return ret;

err_close_vm:
	drm_gem_vm_close(vma);

	return ret;
}

int exynos_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma)
{
	struct drm_gem_object *obj;
	int ret;

	/* set vm_area_struct. */
	ret = drm_gem_mmap(filp, vma);
	if (ret < 0) {
		DRM_ERROR("failed to mmap.\n");
		return ret;
	}

	obj = vma->vm_private_data;

	if (obj->import_attach)
		return dma_buf_mmap(obj->dma_buf, vma, 0);

	return exynos_drm_gem_mmap_obj(obj, vma);
}

/* low-level interface prime helpers */
struct drm_gem_object *exynos_drm_gem_prime_import(struct drm_device *dev,
					    struct dma_buf *dma_buf)
{
	return drm_gem_prime_import_dev(dev, dma_buf, to_dma_dev(dev));
}

struct sg_table *exynos_drm_gem_prime_get_sg_table(struct drm_gem_object *obj)
{
	struct exynos_drm_gem *exynos_gem = to_exynos_gem(obj);
	struct drm_device *drm_dev = obj->dev;
	struct sg_table *sgt;
	int ret;

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

	ret = dma_get_sgtable_attrs(to_dma_dev(drm_dev), sgt, exynos_gem->cookie,
				    exynos_gem->dma_addr, exynos_gem->size,
				    exynos_gem->dma_attrs);
	if (ret) {
		DRM_ERROR("failed to get sgtable, %d\n", ret);
		kfree(sgt);
		return ERR_PTR(ret);
	}

	return sgt;
}

struct drm_gem_object *
exynos_drm_gem_prime_import_sg_table(struct drm_device *dev,
				     struct dma_buf_attachment *attach,
				     struct sg_table *sgt)
{
	struct exynos_drm_gem *exynos_gem;

	/* check if the entries in the sg_table are contiguous */
	if (drm_prime_get_contiguous_size(sgt) < attach->dmabuf->size) {
		DRM_ERROR("buffer chunks must be mapped contiguously");
		return ERR_PTR(-EINVAL);
	}

	exynos_gem = exynos_drm_gem_init(dev, attach->dmabuf->size);
	if (IS_ERR(exynos_gem))
		return ERR_CAST(exynos_gem);

	/*
	 * Buffer has been mapped as contiguous into DMA address space,
	 * but if there is IOMMU, it can be either CONTIG or NONCONTIG.
	 * We assume a simplified logic below:
	 */
	if (is_drm_iommu_supported(dev))
		exynos_gem->flags |= EXYNOS_BO_NONCONTIG;
	else
		exynos_gem->flags |= EXYNOS_BO_CONTIG;

	exynos_gem->dma_addr = sg_dma_address(sgt->sgl);
	exynos_gem->sgt = sgt;
	return &exynos_gem->base;
}

void *exynos_drm_gem_prime_vmap(struct drm_gem_object *obj)
{
	return NULL;
}

void exynos_drm_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr)
{
	/* Nothing to do */
}

int exynos_drm_gem_prime_mmap(struct drm_gem_object *obj,
			      struct vm_area_struct *vma)
{
	int ret;

	ret = drm_gem_mmap_obj(obj, obj->size, vma);
	if (ret < 0)
		return ret;

	return exynos_drm_gem_mmap_obj(obj, vma);
}