summaryrefslogtreecommitdiffstats
path: root/drivers/gpu/drm/exynos/exynos_drm_gem.c
blob: a8e7a88906ed22e43fb23d23a859dc825a335451 (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
/* exynos_drm_gem.c
 *
 * Copyright (c) 2011 Samsung Electronics Co., Ltd.
 * Author: Inki Dae <inki.dae@samsung.com>
 *
 * 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 (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 NONINFRINGEMENT.  IN NO EVENT SHALL
 * VA LINUX SYSTEMS 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.
 */

#include "drmP.h"
#include "drm.h"

#include <drm/exynos_drm.h>

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

static unsigned int convert_to_vm_err_msg(int msg)
{
	unsigned int out_msg;

	switch (msg) {
	case 0:
	case -ERESTARTSYS:
	case -EINTR:
		out_msg = VM_FAULT_NOPAGE;
		break;

	case -ENOMEM:
		out_msg = VM_FAULT_OOM;
		break;

	default:
		out_msg = VM_FAULT_SIGBUS;
		break;
	}

	return out_msg;
}

static unsigned int get_gem_mmap_offset(struct drm_gem_object *obj)
{
	DRM_DEBUG_KMS("%s\n", __FILE__);

	return (unsigned int)obj->map_list.hash.key << PAGE_SHIFT;
}

struct exynos_drm_gem_obj *exynos_drm_gem_create(struct drm_file *file_priv,
		struct drm_device *dev, unsigned int size,
		unsigned int *handle)
{
	struct exynos_drm_gem_obj *exynos_gem_obj;
	struct exynos_drm_buf_entry *entry;
	struct drm_gem_object *obj;
	int ret;

	DRM_DEBUG_KMS("%s\n", __FILE__);

	size = roundup(size, PAGE_SIZE);

	exynos_gem_obj = kzalloc(sizeof(*exynos_gem_obj), GFP_KERNEL);
	if (!exynos_gem_obj) {
		DRM_ERROR("failed to allocate exynos gem object.\n");
		return ERR_PTR(-ENOMEM);
	}

	/* allocate the new buffer object and memory region. */
	entry = exynos_drm_buf_create(dev, size);
	if (!entry) {
		kfree(exynos_gem_obj);
		return ERR_PTR(-ENOMEM);
	}

	exynos_gem_obj->entry = entry;

	obj = &exynos_gem_obj->base;

	ret = drm_gem_object_init(dev, obj, size);
	if (ret < 0) {
		DRM_ERROR("failed to initailize gem object.\n");
		goto err_obj_init;
	}

	DRM_DEBUG_KMS("created file object = 0x%x\n", (unsigned int)obj->filp);

	ret = drm_gem_create_mmap_offset(obj);
	if (ret < 0) {
		DRM_ERROR("failed to allocate mmap offset.\n");
		goto err_create_mmap_offset;
	}

	/*
	 * 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)
		goto err_handle_create;

	DRM_DEBUG_KMS("gem handle = 0x%x\n", *handle);

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

	return exynos_gem_obj;

err_handle_create:
	drm_gem_free_mmap_offset(obj);

err_create_mmap_offset:
	drm_gem_object_release(obj);

err_obj_init:
	exynos_drm_buf_destroy(dev, exynos_gem_obj->entry);

	kfree(exynos_gem_obj);

	return ERR_PTR(ret);
}

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_obj *exynos_gem_obj;

	DRM_DEBUG_KMS("%s : size = 0x%x\n", __FILE__, args->size);

	exynos_gem_obj = exynos_drm_gem_create(file_priv, dev, args->size,
			&args->handle);
	if (IS_ERR(exynos_gem_obj))
		return PTR_ERR(exynos_gem_obj);

	return 0;
}

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

	DRM_DEBUG_KMS("%s\n", __FILE__);

	DRM_DEBUG_KMS("handle = 0x%x, offset = 0x%lx\n",
			args->handle, (unsigned long)args->offset);

	if (!(dev->driver->driver_features & DRIVER_GEM)) {
		DRM_ERROR("does not support GEM.\n");
		return -ENODEV;
	}

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

static int exynos_drm_gem_mmap_buffer(struct file *filp,
		struct vm_area_struct *vma)
{
	struct drm_gem_object *obj = filp->private_data;
	struct exynos_drm_gem_obj *exynos_gem_obj = to_exynos_gem_obj(obj);
	struct exynos_drm_buf_entry *entry;
	unsigned long pfn, vm_size;

	DRM_DEBUG_KMS("%s\n", __FILE__);

	vma->vm_flags |= (VM_IO | VM_RESERVED);

	vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
	vma->vm_file = filp;

	vm_size = vma->vm_end - vma->vm_start;
	/*
	 * a entry contains information to physically continuous memory
	 * allocated by user request or at framebuffer creation.
	 */
	entry = exynos_gem_obj->entry;

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

	/*
	 * get page frame number to physical memory to be mapped
	 * to user space.
	 */
	pfn = exynos_gem_obj->entry->paddr >> PAGE_SHIFT;

	DRM_DEBUG_KMS("pfn = 0x%lx\n", pfn);

	if (remap_pfn_range(vma, vma->vm_start, pfn, vm_size,
				vma->vm_page_prot)) {
		DRM_ERROR("failed to remap pfn range.\n");
		return -EAGAIN;
	}

	return 0;
}

static const struct file_operations exynos_drm_gem_fops = {
	.mmap = exynos_drm_gem_mmap_buffer,
};

int exynos_drm_gem_mmap_ioctl(struct drm_device *dev, void *data,
		struct drm_file *file_priv)
{
	struct drm_exynos_gem_mmap *args = data;
	struct drm_gem_object *obj;
	unsigned int addr;

	DRM_DEBUG_KMS("%s\n", __FILE__);

	if (!(dev->driver->driver_features & DRIVER_GEM)) {
		DRM_ERROR("does not support GEM.\n");
		return -ENODEV;
	}

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

	obj->filp->f_op = &exynos_drm_gem_fops;
	obj->filp->private_data = obj;

	down_write(&current->mm->mmap_sem);
	addr = do_mmap(obj->filp, 0, args->size,
			PROT_READ | PROT_WRITE, MAP_SHARED, 0);
	up_write(&current->mm->mmap_sem);

	drm_gem_object_unreference_unlocked(obj);

	if (IS_ERR((void *)addr))
		return PTR_ERR((void *)addr);

	args->mapped = addr;

	DRM_DEBUG_KMS("mapped = 0x%lx\n", (unsigned long)args->mapped);

	return 0;
}

int exynos_drm_gem_init_object(struct drm_gem_object *obj)
{
	DRM_DEBUG_KMS("%s\n", __FILE__);

	return 0;
}

void exynos_drm_gem_free_object(struct drm_gem_object *gem_obj)
{
	struct exynos_drm_gem_obj *exynos_gem_obj;

	DRM_DEBUG_KMS("%s\n", __FILE__);

	DRM_DEBUG_KMS("handle count = %d\n",
			atomic_read(&gem_obj->handle_count));

	if (gem_obj->map_list.map)
		drm_gem_free_mmap_offset(gem_obj);

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

	exynos_gem_obj = to_exynos_gem_obj(gem_obj);

	exynos_drm_buf_destroy(gem_obj->dev, exynos_gem_obj->entry);

	kfree(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_obj *exynos_gem_obj;

	DRM_DEBUG_KMS("%s\n", __FILE__);

	/*
	 * alocate 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 >> 3;
	args->size = args->pitch * args->height;

	exynos_gem_obj = exynos_drm_gem_create(file_priv, dev, args->size,
							&args->handle);
	if (IS_ERR(exynos_gem_obj))
		return PTR_ERR(exynos_gem_obj);

	return 0;
}

int exynos_drm_gem_dumb_map_offset(struct drm_file *file_priv,
		struct drm_device *dev, uint32_t handle, uint64_t *offset)
{
	struct exynos_drm_gem_obj *exynos_gem_obj;
	struct drm_gem_object *obj;

	DRM_DEBUG_KMS("%s\n", __FILE__);

	mutex_lock(&dev->struct_mutex);

	/*
	 * get offset of memory allocated for drm framebuffer.
	 * - this callback would be called by user application
	 *	with DRM_IOCTL_MODE_MAP_DUMB command.
	 */

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

	exynos_gem_obj = to_exynos_gem_obj(obj);

	*offset = get_gem_mmap_offset(&exynos_gem_obj->base);

	drm_gem_object_unreference(obj);

	DRM_DEBUG_KMS("offset = 0x%lx\n", (unsigned long)*offset);

	mutex_unlock(&dev->struct_mutex);

	return 0;
}

int exynos_drm_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
{
	struct drm_gem_object *obj = vma->vm_private_data;
	struct exynos_drm_gem_obj *exynos_gem_obj = to_exynos_gem_obj(obj);
	struct drm_device *dev = obj->dev;
	unsigned long pfn;
	pgoff_t page_offset;
	int ret;

	page_offset = ((unsigned long)vmf->virtual_address -
			vma->vm_start) >> PAGE_SHIFT;

	mutex_lock(&dev->struct_mutex);

	pfn = (exynos_gem_obj->entry->paddr >> PAGE_SHIFT) + page_offset;

	ret = vm_insert_mixed(vma, (unsigned long)vmf->virtual_address, pfn);

	mutex_unlock(&dev->struct_mutex);

	return convert_to_vm_err_msg(ret);
}

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

	DRM_DEBUG_KMS("%s\n", __FILE__);

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

	vma->vm_flags &= ~VM_PFNMAP;
	vma->vm_flags |= VM_MIXEDMAP;

	return ret;
}


int exynos_drm_gem_dumb_destroy(struct drm_file *file_priv,
		struct drm_device *dev, unsigned int handle)
{
	int ret;

	DRM_DEBUG_KMS("%s\n", __FILE__);

	/*
	 * obj->refcount and obj->handle_count are decreased and
	 * if both them are 0 then exynos_drm_gem_free_object()
	 * would be called by callback to release resources.
	 */
	ret = drm_gem_handle_delete(file_priv, handle);
	if (ret < 0) {
		DRM_ERROR("failed to delete drm_gem_handle.\n");
		return ret;
	}

	return 0;
}

MODULE_AUTHOR("Inki Dae <inki.dae@samsung.com>");
MODULE_DESCRIPTION("Samsung SoC DRM GEM Module");
MODULE_LICENSE("GPL");