summaryrefslogtreecommitdiffstats
path: root/drivers/char/drm/gamma_old_dma.h
blob: abdd454aab9f1f7c70af3f4f01361142b37fd0dc (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
/* drm_dma.c -- DMA IOCTL and function support -*- linux-c -*-
 * Created: Fri Mar 19 14:30:16 1999 by faith@valinux.com
 *
 * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.
 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
 * All Rights Reserved.
 *
 * 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.
 *
 * Authors:
 *    Rickard E. (Rik) Faith <faith@valinux.com>
 *    Gareth Hughes <gareth@valinux.com>
 */


/* Gamma-specific code pulled from drm_dma.h:
 */

void DRM(clear_next_buffer)(drm_device_t *dev)
{
	drm_device_dma_t *dma = dev->dma;

	dma->next_buffer = NULL;
	if (dma->next_queue && !DRM_BUFCOUNT(&dma->next_queue->waitlist)) {
		wake_up_interruptible(&dma->next_queue->flush_queue);
	}
	dma->next_queue	 = NULL;
}

int DRM(select_queue)(drm_device_t *dev, void (*wrapper)(unsigned long))
{
	int	   i;
	int	   candidate = -1;
	int	   j	     = jiffies;

	if (!dev) {
		DRM_ERROR("No device\n");
		return -1;
	}
	if (!dev->queuelist || !dev->queuelist[DRM_KERNEL_CONTEXT]) {
				/* This only happens between the time the
				   interrupt is initialized and the time
				   the queues are initialized. */
		return -1;
	}

				/* Doing "while locked" DMA? */
	if (DRM_WAITCOUNT(dev, DRM_KERNEL_CONTEXT)) {
		return DRM_KERNEL_CONTEXT;
	}

				/* If there are buffers on the last_context
				   queue, and we have not been executing
				   this context very long, continue to
				   execute this context. */
	if (dev->last_switch <= j
	    && dev->last_switch + DRM_TIME_SLICE > j
	    && DRM_WAITCOUNT(dev, dev->last_context)) {
		return dev->last_context;
	}

				/* Otherwise, find a candidate */
	for (i = dev->last_checked + 1; i < dev->queue_count; i++) {
		if (DRM_WAITCOUNT(dev, i)) {
			candidate = dev->last_checked = i;
			break;
		}
	}

	if (candidate < 0) {
		for (i = 0; i < dev->queue_count; i++) {
			if (DRM_WAITCOUNT(dev, i)) {
				candidate = dev->last_checked = i;
				break;
			}
		}
	}

	if (wrapper
	    && candidate >= 0
	    && candidate != dev->last_context
	    && dev->last_switch <= j
	    && dev->last_switch + DRM_TIME_SLICE > j) {
		if (dev->timer.expires != dev->last_switch + DRM_TIME_SLICE) {
			del_timer(&dev->timer);
			dev->timer.function = wrapper;
			dev->timer.data	    = (unsigned long)dev;
			dev->timer.expires  = dev->last_switch+DRM_TIME_SLICE;
			add_timer(&dev->timer);
		}
		return -1;
	}

	return candidate;
}


int DRM(dma_enqueue)(struct file *filp, drm_dma_t *d)
{
	drm_file_t    *priv   = filp->private_data;
	drm_device_t  *dev    = priv->dev;
	int		  i;
	drm_queue_t	  *q;
	drm_buf_t	  *buf;
	int		  idx;
	int		  while_locked = 0;
	drm_device_dma_t  *dma = dev->dma;
	int		  *ind;
	int		  err;
	DECLARE_WAITQUEUE(entry, current);

	DRM_DEBUG("%d\n", d->send_count);

	if (d->flags & _DRM_DMA_WHILE_LOCKED) {
		int context = dev->lock.hw_lock->lock;

		if (!_DRM_LOCK_IS_HELD(context)) {
			DRM_ERROR("No lock held during \"while locked\""
				  " request\n");
			return -EINVAL;
		}
		if (d->context != _DRM_LOCKING_CONTEXT(context)
		    && _DRM_LOCKING_CONTEXT(context) != DRM_KERNEL_CONTEXT) {
			DRM_ERROR("Lock held by %d while %d makes"
				  " \"while locked\" request\n",
				  _DRM_LOCKING_CONTEXT(context),
				  d->context);
			return -EINVAL;
		}
		q = dev->queuelist[DRM_KERNEL_CONTEXT];
		while_locked = 1;
	} else {
		q = dev->queuelist[d->context];
	}


	atomic_inc(&q->use_count);
	if (atomic_read(&q->block_write)) {
		add_wait_queue(&q->write_queue, &entry);
		atomic_inc(&q->block_count);
		for (;;) {
			current->state = TASK_INTERRUPTIBLE;
			if (!atomic_read(&q->block_write)) break;
			schedule();
			if (signal_pending(current)) {
				atomic_dec(&q->use_count);
				remove_wait_queue(&q->write_queue, &entry);
				return -EINTR;
			}
		}
		atomic_dec(&q->block_count);
		current->state = TASK_RUNNING;
		remove_wait_queue(&q->write_queue, &entry);
	}

	ind = DRM(alloc)(d->send_count * sizeof(int), DRM_MEM_DRIVER);
	if (!ind)
		return -ENOMEM;

	if (copy_from_user(ind, d->send_indices, d->send_count * sizeof(int))) {
		err = -EFAULT;
                goto out;
	}

	err = -EINVAL;
	for (i = 0; i < d->send_count; i++) {
		idx = ind[i];
		if (idx < 0 || idx >= dma->buf_count) {
			DRM_ERROR("Index %d (of %d max)\n",
				  ind[i], dma->buf_count - 1);
			goto out;
		}
		buf = dma->buflist[ idx ];
		if (buf->filp != filp) {
			DRM_ERROR("Process %d using buffer not owned\n",
				  current->pid);
			goto out;
		}
		if (buf->list != DRM_LIST_NONE) {
			DRM_ERROR("Process %d using buffer %d on list %d\n",
				  current->pid, buf->idx, buf->list);
			goto out;
		}
		buf->used	  = ind[i];
		buf->while_locked = while_locked;
		buf->context	  = d->context;
		if (!buf->used) {
			DRM_ERROR("Queueing 0 length buffer\n");
		}
		if (buf->pending) {
			DRM_ERROR("Queueing pending buffer:"
				  " buffer %d, offset %d\n",
				  ind[i], i);
			goto out;
		}
		if (buf->waiting) {
			DRM_ERROR("Queueing waiting buffer:"
				  " buffer %d, offset %d\n",
				  ind[i], i);
			goto out;
		}
		buf->waiting = 1;
		if (atomic_read(&q->use_count) == 1
		    || atomic_read(&q->finalization)) {
			DRM(free_buffer)(dev, buf);
		} else {
			DRM(waitlist_put)(&q->waitlist, buf);
			atomic_inc(&q->total_queued);
		}
	}
	atomic_dec(&q->use_count);

	return 0;

out:
	DRM(free)(ind, d->send_count * sizeof(int), DRM_MEM_DRIVER);
	atomic_dec(&q->use_count);
	return err;
}

static int DRM(dma_get_buffers_of_order)(struct file *filp, drm_dma_t *d,
					 int order)
{
	drm_file_t    *priv   = filp->private_data;
	drm_device_t  *dev    = priv->dev;
	int		  i;
	drm_buf_t	  *buf;
	drm_device_dma_t  *dma = dev->dma;

	for (i = d->granted_count; i < d->request_count; i++) {
		buf = DRM(freelist_get)(&dma->bufs[order].freelist,
					d->flags & _DRM_DMA_WAIT);
		if (!buf) break;
		if (buf->pending || buf->waiting) {
			DRM_ERROR("Free buffer %d in use: filp %p (w%d, p%d)\n",
				  buf->idx,
				  buf->filp,
				  buf->waiting,
				  buf->pending);
		}
		buf->filp     = filp;
		if (copy_to_user(&d->request_indices[i],
				 &buf->idx,
				 sizeof(buf->idx)))
			return -EFAULT;

		if (copy_to_user(&d->request_sizes[i],
				 &buf->total,
				 sizeof(buf->total)))
			return -EFAULT;

		++d->granted_count;
	}
	return 0;
}


int DRM(dma_get_buffers)(struct file *filp, drm_dma_t *dma)
{
	int		  order;
	int		  retcode = 0;
	int		  tmp_order;

	order = DRM(order)(dma->request_size);

	dma->granted_count = 0;
	retcode		   = DRM(dma_get_buffers_of_order)(filp, dma, order);

	if (dma->granted_count < dma->request_count
	    && (dma->flags & _DRM_DMA_SMALLER_OK)) {
		for (tmp_order = order - 1;
		     !retcode
			     && dma->granted_count < dma->request_count
			     && tmp_order >= DRM_MIN_ORDER;
		     --tmp_order) {

			retcode = DRM(dma_get_buffers_of_order)(filp, dma,
								tmp_order);
		}
	}

	if (dma->granted_count < dma->request_count
	    && (dma->flags & _DRM_DMA_LARGER_OK)) {
		for (tmp_order = order + 1;
		     !retcode
			     && dma->granted_count < dma->request_count
			     && tmp_order <= DRM_MAX_ORDER;
		     ++tmp_order) {

			retcode = DRM(dma_get_buffers_of_order)(filp, dma,
								tmp_order);
		}
	}
	return 0;
}