1 /* drm_dma.c -- DMA IOCTL and function support -*- linux-c -*-
2 * Created: Fri Mar 19 14:30:16 1999 by faith@valinux.com
3 *
4 * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.
5 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
6 * All Rights Reserved.
7 *
8 * Permission is hereby granted, free of charge, to any person obtaining a
9 * copy of this software and associated documentation files (the "Software"),
10 * to deal in the Software without restriction, including without limitation
11 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
12 * and/or sell copies of the Software, and to permit persons to whom the
13 * Software is furnished to do so, subject to the following conditions:
14 *
15 * The above copyright notice and this permission notice (including the next
16 * paragraph) shall be included in all copies or substantial portions of the
17 * Software.
18 *
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
20 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
22 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
23 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
24 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
25 * OTHER DEALINGS IN THE SOFTWARE.
26 *
27 * Authors:
28 * Rickard E. (Rik) Faith <faith@valinux.com>
29 * Gareth Hughes <gareth@valinux.com>
30 */
31
32
33 /* Gamma-specific code pulled from drm_dma.h:
34 */
35
36 void DRM(clear_next_buffer)(drm_device_t *dev)
37 {
38 drm_device_dma_t *dma = dev->dma;
39
40 dma->next_buffer = NULL;
41 if (dma->next_queue && !DRM_BUFCOUNT(&dma->next_queue->waitlist)) {
42 wake_up_interruptible(&dma->next_queue->flush_queue);
43 }
44 dma->next_queue = NULL;
45 }
46
47 int DRM(select_queue)(drm_device_t *dev, void (*wrapper)(unsigned long))
48 {
49 int i;
50 int candidate = -1;
51 int j = jiffies;
52
53 if (!dev) {
54 DRM_ERROR("No device\n");
55 return -1;
56 }
57 if (!dev->queuelist || !dev->queuelist[DRM_KERNEL_CONTEXT]) {
58 /* This only happens between the time the
59 interrupt is initialized and the time
60 the queues are initialized. */
61 return -1;
62 }
63
64 /* Doing "while locked" DMA? */
65 if (DRM_WAITCOUNT(dev, DRM_KERNEL_CONTEXT)) {
66 return DRM_KERNEL_CONTEXT;
67 }
68
69 /* If there are buffers on the last_context
70 queue, and we have not been executing
71 this context very long, continue to
72 execute this context. */
73 if (dev->last_switch <= j
74 && dev->last_switch + DRM_TIME_SLICE > j
75 && DRM_WAITCOUNT(dev, dev->last_context)) {
76 return dev->last_context;
77 }
78
79 /* Otherwise, find a candidate */
80 for (i = dev->last_checked + 1; i < dev->queue_count; i++) {
81 if (DRM_WAITCOUNT(dev, i)) {
82 candidate = dev->last_checked = i;
83 break;
84 }
85 }
86
87 if (candidate < 0) {
88 for (i = 0; i < dev->queue_count; i++) {
89 if (DRM_WAITCOUNT(dev, i)) {
90 candidate = dev->last_checked = i;
91 break;
92 }
93 }
94 }
95
96 if (wrapper
97 && candidate >= 0
98 && candidate != dev->last_context
99 && dev->last_switch <= j
100 && dev->last_switch + DRM_TIME_SLICE > j) {
101 if (dev->timer.expires != dev->last_switch + DRM_TIME_SLICE) {
102 del_timer(&dev->timer);
103 dev->timer.function = wrapper;
104 dev->timer.data = (unsigned long)dev;
105 dev->timer.expires = dev->last_switch+DRM_TIME_SLICE;
106 add_timer(&dev->timer);
107 }
108 return -1;
109 }
110
111 return candidate;
112 }
113
114
115 int DRM(dma_enqueue)(struct file *filp, drm_dma_t *d)
116 {
117 drm_file_t *priv = filp->private_data;
118 drm_device_t *dev = priv->dev;
119 int i;
120 drm_queue_t *q;
121 drm_buf_t *buf;
122 int idx;
123 int while_locked = 0;
124 drm_device_dma_t *dma = dev->dma;
125 int *ind;
126 int err;
127 DECLARE_WAITQUEUE(entry, current);
128
129 DRM_DEBUG("%d\n", d->send_count);
130
131 if (d->flags & _DRM_DMA_WHILE_LOCKED) {
132 int context = dev->lock.hw_lock->lock;
133
134 if (!_DRM_LOCK_IS_HELD(context)) {
135 DRM_ERROR("No lock held during \"while locked\""
136 " request\n");
137 return -EINVAL;
138 }
139 if (d->context != _DRM_LOCKING_CONTEXT(context)
140 && _DRM_LOCKING_CONTEXT(context) != DRM_KERNEL_CONTEXT) {
141 DRM_ERROR("Lock held by %d while %d makes"
142 " \"while locked\" request\n",
143 _DRM_LOCKING_CONTEXT(context),
144 d->context);
145 return -EINVAL;
146 }
147 q = dev->queuelist[DRM_KERNEL_CONTEXT];
148 while_locked = 1;
149 } else {
150 q = dev->queuelist[d->context];
151 }
152
153
154 atomic_inc(&q->use_count);
155 if (atomic_read(&q->block_write)) {
156 add_wait_queue(&q->write_queue, &entry);
157 atomic_inc(&q->block_count);
158 for (;;) {
159 current->state = TASK_INTERRUPTIBLE;
160 if (!atomic_read(&q->block_write)) break;
161 schedule();
162 if (signal_pending(current)) {
163 atomic_dec(&q->use_count);
164 remove_wait_queue(&q->write_queue, &entry);
165 return -EINTR;
166 }
167 }
168 atomic_dec(&q->block_count);
169 current->state = TASK_RUNNING;
170 remove_wait_queue(&q->write_queue, &entry);
171 }
172
173 ind = DRM(alloc)(d->send_count * sizeof(int), DRM_MEM_DRIVER);
174 if (!ind)
175 return -ENOMEM;
176
177 if (copy_from_user(ind, d->send_indices, d->send_count * sizeof(int))) {
178 err = -EFAULT;
179 goto out;
180 }
181
182 err = -EINVAL;
183 for (i = 0; i < d->send_count; i++) {
184 idx = ind[i];
185 if (idx < 0 || idx >= dma->buf_count) {
186 DRM_ERROR("Index %d (of %d max)\n",
187 ind[i], dma->buf_count - 1);
188 goto out;
189 }
190 buf = dma->buflist[ idx ];
191 if (buf->filp != filp) {
192 DRM_ERROR("Process %d using buffer not owned\n",
193 current->pid);
194 goto out;
195 }
196 if (buf->list != DRM_LIST_NONE) {
197 DRM_ERROR("Process %d using buffer %d on list %d\n",
198 current->pid, buf->idx, buf->list);
199 goto out;
200 }
201 buf->used = ind[i];
202 buf->while_locked = while_locked;
203 buf->context = d->context;
204 if (!buf->used) {
205 DRM_ERROR("Queueing 0 length buffer\n");
206 }
207 if (buf->pending) {
208 DRM_ERROR("Queueing pending buffer:"
209 " buffer %d, offset %d\n",
210 ind[i], i);
211 goto out;
212 }
213 if (buf->waiting) {
214 DRM_ERROR("Queueing waiting buffer:"
215 " buffer %d, offset %d\n",
216 ind[i], i);
217 goto out;
218 }
219 buf->waiting = 1;
220 if (atomic_read(&q->use_count) == 1
221 || atomic_read(&q->finalization)) {
222 DRM(free_buffer)(dev, buf);
223 } else {
224 DRM(waitlist_put)(&q->waitlist, buf);
225 atomic_inc(&q->total_queued);
226 }
227 }
228 atomic_dec(&q->use_count);
229
230 return 0;
231
232 out:
233 DRM(free)(ind, d->send_count * sizeof(int), DRM_MEM_DRIVER);
234 atomic_dec(&q->use_count);
235 return err;
236 }
237
238 static int DRM(dma_get_buffers_of_order)(struct file *filp, drm_dma_t *d,
239 int order)
240 {
241 drm_file_t *priv = filp->private_data;
242 drm_device_t *dev = priv->dev;
243 int i;
244 drm_buf_t *buf;
245 drm_device_dma_t *dma = dev->dma;
246
247 for (i = d->granted_count; i < d->request_count; i++) {
248 buf = DRM(freelist_get)(&dma->bufs[order].freelist,
249 d->flags & _DRM_DMA_WAIT);
250 if (!buf) break;
251 if (buf->pending || buf->waiting) {
252 DRM_ERROR("Free buffer %d in use: filp %p (w%d, p%d)\n",
253 buf->idx,
254 buf->filp,
255 buf->waiting,
256 buf->pending);
257 }
258 buf->filp = filp;
259 if (copy_to_user(&d->request_indices[i],
260 &buf->idx,
261 sizeof(buf->idx)))
262 return -EFAULT;
263
264 if (copy_to_user(&d->request_sizes[i],
265 &buf->total,
266 sizeof(buf->total)))
267 return -EFAULT;
268
269 ++d->granted_count;
270 }
271 return 0;
272 }
273
274
275 int DRM(dma_get_buffers)(struct file *filp, drm_dma_t *dma)
276 {
277 int order;
278 int retcode = 0;
279 int tmp_order;
280
281 order = DRM(order)(dma->request_size);
282
283 dma->granted_count = 0;
284 retcode = DRM(dma_get_buffers_of_order)(filp, dma, order);
285
286 if (dma->granted_count < dma->request_count
287 && (dma->flags & _DRM_DMA_SMALLER_OK)) {
288 for (tmp_order = order - 1;
289 !retcode
290 && dma->granted_count < dma->request_count
291 && tmp_order >= DRM_MIN_ORDER;
292 --tmp_order) {
293
294 retcode = DRM(dma_get_buffers_of_order)(filp, dma,
295 tmp_order);
296 }
297 }
298
299 if (dma->granted_count < dma->request_count
300 && (dma->flags & _DRM_DMA_LARGER_OK)) {
301 for (tmp_order = order + 1;
302 !retcode
303 && dma->granted_count < dma->request_count
304 && tmp_order <= DRM_MAX_ORDER;
305 ++tmp_order) {
306
307 retcode = DRM(dma_get_buffers_of_order)(filp, dma,
308 tmp_order);
309 }
310 }
311 return 0;
312 }
313
314
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