summaryrefslogtreecommitdiffstats
path: root/omap/omap_drm.c
blob: aa2736604954232c12d9a922c0d64a60b6a25514 (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
/* -*- mode: C; c-file-style: "k&r"; tab-width 4; indent-tabs-mode: t; -*- */

/*
 * Copyright (C) 2011 Texas Instruments, Inc
 *
 * 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
 * THE AUTHORS OR COPYRIGHT HOLDERS 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:
 *    Rob Clark <rob@ti.com>
 */

#include <stdlib.h>
#include <linux/stddef.h>
#include <linux/types.h>
#include <errno.h>
#include <sys/mman.h>
#include <fcntl.h>
#include <unistd.h>
#include <pthread.h>

#include <libdrm_macros.h>
#include <xf86drm.h>
#include <xf86atomic.h>

#include "omap_drm.h"
#include "omap_drmif.h"

#define __round_mask(x, y) ((__typeof__(x))((y)-1))
#define round_up(x, y) ((((x)-1) | __round_mask(x, y))+1)
#define PAGE_SIZE 4096

static pthread_mutex_t table_lock = PTHREAD_MUTEX_INITIALIZER;
static void * dev_table;

struct omap_device {
	int fd;
	atomic_t refcnt;

	/* The handle_table is used to track GEM bo handles associated w/
	 * this fd.  This is needed, in particular, when importing
	 * dmabuf's because we don't want multiple 'struct omap_bo's
	 * floating around with the same handle.  Otherwise, when the
	 * first one is omap_bo_del()'d the handle becomes no longer
	 * valid, and the remaining 'struct omap_bo's are left pointing
	 * to an invalid handle (and possible a GEM bo that is already
	 * free'd).
	 */
	void *handle_table;
};

/* a GEM buffer object allocated from the DRM device */
struct omap_bo {
	struct omap_device	*dev;
	void		*map;		/* userspace mmap'ing (if there is one) */
	uint32_t	size;
	uint32_t	handle;
	uint32_t	name;		/* flink global handle (DRI2 name) */
	uint64_t	offset;		/* offset to mmap() */
	int		fd;		/* dmabuf handle */
	atomic_t	refcnt;
};

static struct omap_device * omap_device_new_impl(int fd)
{
	struct omap_device *dev = calloc(sizeof(*dev), 1);
	if (!dev)
		return NULL;
	dev->fd = fd;
	atomic_set(&dev->refcnt, 1);
	dev->handle_table = drmHashCreate();
	return dev;
}

drm_public struct omap_device * omap_device_new(int fd)
{
	struct omap_device *dev = NULL;

	pthread_mutex_lock(&table_lock);

	if (!dev_table)
		dev_table = drmHashCreate();

	if (drmHashLookup(dev_table, fd, (void **)&dev)) {
		/* not found, create new device */
		dev = omap_device_new_impl(fd);
		drmHashInsert(dev_table, fd, dev);
	} else {
		/* found, just incr refcnt */
		dev = omap_device_ref(dev);
	}

	pthread_mutex_unlock(&table_lock);

	return dev;
}

drm_public struct omap_device * omap_device_ref(struct omap_device *dev)
{
	atomic_inc(&dev->refcnt);
	return dev;
}

drm_public void omap_device_del(struct omap_device *dev)
{
	if (!atomic_dec_and_test(&dev->refcnt))
		return;
	pthread_mutex_lock(&table_lock);
	drmHashDestroy(dev->handle_table);
	drmHashDelete(dev_table, dev->fd);
	pthread_mutex_unlock(&table_lock);
	free(dev);
}

drm_public int
omap_get_param(struct omap_device *dev, uint64_t param, uint64_t *value)
{
	struct drm_omap_param req = {
			.param = param,
	};
	int ret;

	ret = drmCommandWriteRead(dev->fd, DRM_OMAP_GET_PARAM, &req, sizeof(req));
	if (ret) {
		return ret;
	}

	*value = req.value;

	return 0;
}

drm_public int
omap_set_param(struct omap_device *dev, uint64_t param, uint64_t value)
{
	struct drm_omap_param req = {
			.param = param,
			.value = value,
	};
	return drmCommandWrite(dev->fd, DRM_OMAP_SET_PARAM, &req, sizeof(req));
}

/* lookup a buffer from it's handle, call w/ table_lock held: */
static struct omap_bo * lookup_bo(struct omap_device *dev,
		uint32_t handle)
{
	struct omap_bo *bo = NULL;
	if (!drmHashLookup(dev->handle_table, handle, (void **)&bo)) {
		/* found, incr refcnt and return: */
		bo = omap_bo_ref(bo);
	}
	return bo;
}

/* allocate a new buffer object, call w/ table_lock held */
static struct omap_bo * bo_from_handle(struct omap_device *dev,
		uint32_t handle)
{
	struct omap_bo *bo = calloc(sizeof(*bo), 1);
	if (!bo) {
		drmCloseBufferHandle(dev->fd, handle);
		return NULL;
	}
	bo->dev = omap_device_ref(dev);
	bo->handle = handle;
	bo->fd = -1;
	atomic_set(&bo->refcnt, 1);
	/* add ourselves to the handle table: */
	drmHashInsert(dev->handle_table, handle, bo);
	return bo;
}

/* allocate a new buffer object */
static struct omap_bo * omap_bo_new_impl(struct omap_device *dev,
		union omap_gem_size size, uint32_t flags)
{
	struct omap_bo *bo = NULL;
	struct drm_omap_gem_new req = {
			.size = size,
			.flags = flags,
	};

	if (size.bytes == 0) {
		goto fail;
	}

	if (drmCommandWriteRead(dev->fd, DRM_OMAP_GEM_NEW, &req, sizeof(req))) {
		goto fail;
	}

	pthread_mutex_lock(&table_lock);
	bo = bo_from_handle(dev, req.handle);
	pthread_mutex_unlock(&table_lock);

	if (flags & OMAP_BO_TILED) {
		bo->size = round_up(size.tiled.width, PAGE_SIZE) * size.tiled.height;
	} else {
		bo->size = size.bytes;
	}

	return bo;

fail:
	free(bo);
	return NULL;
}


/* allocate a new (un-tiled) buffer object */
drm_public struct omap_bo *
omap_bo_new(struct omap_device *dev, uint32_t size, uint32_t flags)
{
	union omap_gem_size gsize = {
			.bytes = size,
	};
	if (flags & OMAP_BO_TILED) {
		return NULL;
	}
	return omap_bo_new_impl(dev, gsize, flags);
}

/* allocate a new buffer object */
drm_public struct omap_bo *
omap_bo_new_tiled(struct omap_device *dev, uint32_t width,
		  uint32_t height, uint32_t flags)
{
	union omap_gem_size gsize = {
			.tiled = {
				.width = width,
				.height = height,
			},
	};
	if (!(flags & OMAP_BO_TILED)) {
		return NULL;
	}
	return omap_bo_new_impl(dev, gsize, flags);
}

drm_public struct omap_bo *omap_bo_ref(struct omap_bo *bo)
{
	atomic_inc(&bo->refcnt);
	return bo;
}

/* get buffer info */
static int get_buffer_info(struct omap_bo *bo)
{
	struct drm_omap_gem_info req = {
			.handle = bo->handle,
	};
	int ret = drmCommandWriteRead(bo->dev->fd, DRM_OMAP_GEM_INFO,
			&req, sizeof(req));
	if (ret) {
		return ret;
	}

	/* really all we need for now is mmap offset */
	bo->offset = req.offset;
	bo->size = req.size;

	return 0;
}

/* import a buffer object from DRI2 name */
drm_public struct omap_bo *
omap_bo_from_name(struct omap_device *dev, uint32_t name)
{
	struct omap_bo *bo = NULL;
	struct drm_gem_open req = {
			.name = name,
	};

	pthread_mutex_lock(&table_lock);

	if (drmIoctl(dev->fd, DRM_IOCTL_GEM_OPEN, &req)) {
		goto fail;
	}

	bo = lookup_bo(dev, req.handle);
	if (!bo) {
		bo = bo_from_handle(dev, req.handle);
		bo->name = name;
	}

	pthread_mutex_unlock(&table_lock);

	return bo;

fail:
	pthread_mutex_unlock(&table_lock);
	free(bo);
	return NULL;
}

/* import a buffer from dmabuf fd, does not take ownership of the
 * fd so caller should close() the fd when it is otherwise done
 * with it (even if it is still using the 'struct omap_bo *')
 */
drm_public struct omap_bo *
omap_bo_from_dmabuf(struct omap_device *dev, int fd)
{
	struct omap_bo *bo = NULL;
	struct drm_prime_handle req = {
			.fd = fd,
	};
	int ret;

	pthread_mutex_lock(&table_lock);

	ret = drmIoctl(dev->fd, DRM_IOCTL_PRIME_FD_TO_HANDLE, &req);
	if (ret) {
		goto fail;
	}

	bo = lookup_bo(dev, req.handle);
	if (!bo) {
		bo = bo_from_handle(dev, req.handle);
	}

	pthread_mutex_unlock(&table_lock);

	return bo;

fail:
	pthread_mutex_unlock(&table_lock);
	free(bo);
	return NULL;
}

/* destroy a buffer object */
drm_public void omap_bo_del(struct omap_bo *bo)
{
	if (!bo) {
		return;
	}

	if (!atomic_dec_and_test(&bo->refcnt))
		return;

	if (bo->map) {
		munmap(bo->map, bo->size);
	}

	if (bo->fd >= 0) {
		close(bo->fd);
	}

	if (bo->handle) {
		pthread_mutex_lock(&table_lock);
		drmHashDelete(bo->dev->handle_table, bo->handle);
		drmCloseBufferHandle(bo->dev->fd, bo->handle);
		pthread_mutex_unlock(&table_lock);
	}

	omap_device_del(bo->dev);

	free(bo);
}

/* get the global flink/DRI2 buffer name */
drm_public int omap_bo_get_name(struct omap_bo *bo, uint32_t *name)
{
	if (!bo->name) {
		struct drm_gem_flink req = {
				.handle = bo->handle,
		};
		int ret;

		ret = drmIoctl(bo->dev->fd, DRM_IOCTL_GEM_FLINK, &req);
		if (ret) {
			return ret;
		}

		bo->name = req.name;
	}

	*name = bo->name;

	return 0;
}

drm_public uint32_t omap_bo_handle(struct omap_bo *bo)
{
	return bo->handle;
}

/* caller owns the dmabuf fd that is returned and is responsible
 * to close() it when done
 */
drm_public int omap_bo_dmabuf(struct omap_bo *bo)
{
	if (bo->fd < 0) {
		struct drm_prime_handle req = {
				.handle = bo->handle,
				.flags = DRM_CLOEXEC | DRM_RDWR,
		};
		int ret;

		ret = drmIoctl(bo->dev->fd, DRM_IOCTL_PRIME_HANDLE_TO_FD, &req);
		if (ret) {
			return ret;
		}

		bo->fd = req.fd;
	}
	return dup(bo->fd);
}

drm_public uint32_t omap_bo_size(struct omap_bo *bo)
{
	if (!bo->size) {
		get_buffer_info(bo);
	}
	return bo->size;
}

drm_public void *omap_bo_map(struct omap_bo *bo)
{
	if (!bo->map) {
		if (!bo->offset) {
			get_buffer_info(bo);
		}

		bo->map = mmap(0, bo->size, PROT_READ | PROT_WRITE,
				MAP_SHARED, bo->dev->fd, bo->offset);
		if (bo->map == MAP_FAILED) {
			bo->map = NULL;
		}
	}
	return bo->map;
}

drm_public int omap_bo_cpu_prep(struct omap_bo *bo, enum omap_gem_op op)
{
	struct drm_omap_gem_cpu_prep req = {
			.handle = bo->handle,
			.op = op,
	};
	return drmCommandWrite(bo->dev->fd,
			DRM_OMAP_GEM_CPU_PREP, &req, sizeof(req));
}

drm_public int omap_bo_cpu_fini(struct omap_bo *bo, enum omap_gem_op op)
{
	struct drm_omap_gem_cpu_fini req = {
			.handle = bo->handle,
			.op = op,
			.nregions = 0,
	};
	return drmCommandWrite(bo->dev->fd,
			DRM_OMAP_GEM_CPU_FINI, &req, sizeof(req));
}