1 /*
2 * Copyright (c) 2006, 2013, Oracle and/or its affiliates. All rights reserved.
3 */
4
5 /**
6 * \file drm_fops.c
7 * File operations for DRM
8 *
9 * \author Rickard E. (Rik) Faith <faith@valinux.com>
10 * \author Daryll Strauss <daryll@valinux.com>
11 * \author Gareth Hughes <gareth@valinux.com>
12 */
13
14 /*
15 * Created: Mon Jan 4 08:58:31 1999 by faith@valinux.com
16 *
17 * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
18 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
19 * Copyright (c) 2009, 2013, Intel Corporation.
20 * All Rights Reserved.
21 *
22 * Permission is hereby granted, free of charge, to any person obtaining a
23 * copy of this software and associated documentation files (the "Software"),
24 * to deal in the Software without restriction, including without limitation
25 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
26 * and/or sell copies of the Software, and to permit persons to whom the
27 * Software is furnished to do so, subject to the following conditions:
28 *
29 * The above copyright notice and this permission notice (including the next
30 * paragraph) shall be included in all copies or substantial portions of the
31 * Software.
32 *
33 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
34 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
35 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
36 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
37 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
38 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
39 * OTHER DEALINGS IN THE SOFTWARE.
40 */
41
42 #include "drmP.h"
43
44 static int drm_open_helper(struct drm_minor *minor,
45 int clone_id, int flags, cred_t *credp);
46
drm_device_is_agp(struct drm_device * dev)47 static __inline__ int drm_device_is_agp(struct drm_device *dev)
48 {
49 if (drm_core_check_feature(dev, DRIVER_USE_PLATFORM_DEVICE))
50 return 0;
51 if (dev->driver->device_is_agp != NULL) {
52 int err = (*dev->driver->device_is_agp) (dev);
53
54 if (err != 2) {
55 return err;
56 }
57 }
58
59 return pci_find_capability(dev->pdev, PCI_CAP_ID_AGP);
60 }
61
drm_setup(struct drm_device * dev)62 static int drm_setup(struct drm_device * dev)
63 {
64 int i;
65 int ret;
66 static bool first_call = true;
67
68 if (first_call) {
69 /* OSOL_drm: moved from drm_fill_in_dev */
70 if (drm_core_has_AGP(dev)) {
71 if (drm_device_is_agp(dev))
72 dev->agp = drm_agp_init(dev);
73 if (drm_core_check_feature(dev, DRIVER_REQUIRE_AGP)
74 && (dev->agp == NULL)) {
75 DRM_ERROR("Cannot initialize the agpgart module.\n");
76 return -EINVAL;
77 }
78 }
79 }
80
81 if (dev->driver->firstopen) {
82 ret = dev->driver->firstopen(dev);
83 if (ret != 0)
84 return ret;
85 }
86
87 if (first_call) {
88 /* OSOL_drm: moved from drm_get_dev */
89 /* setup the grouping for the legacy output */
90 if (drm_core_check_feature(dev, DRIVER_MODESET)) {
91 ret = drm_mode_group_init_legacy_group(dev, &dev->primary->mode_group);
92 if (ret)
93 return ret;
94 }
95 }
96
97 atomic_set(&dev->ioctl_count, 0);
98
99 if (drm_core_check_feature(dev, DRIVER_HAVE_DMA) &&
100 !drm_core_check_feature(dev, DRIVER_MODESET)) {
101 dev->buf_use = 0;
102 atomic_set(&dev->buf_alloc, 0);
103
104 i = drm_dma_setup(dev);
105 if (i < 0)
106 return i;
107 }
108
109 for (i = 0; i < DRM_ARRAY_SIZE(dev->counts); i++)
110 atomic_set(&dev->counts[i], 0);
111
112 dev->context_flag = 0;
113 dev->last_context = 0;
114 dev->if_version = 0;
115
116
117 DRM_DEBUG("\n");
118
119 /*
120 * The kernel's context could be created here, but is now created
121 * in drm_dma_enqueue. This is more resource-efficient for
122 * hardware that does not do DMA, but may mean that
123 * drm_select_queue fails between the time the interrupt is
124 * initialized and the time the queues are initialized.
125 */
126
127 first_call = false;
128 return 0;
129 }
130
131 /**
132 * Open file.
133 *
134 * \return zero on success or a negative number on failure.
135 *
136 * Searches the DRM device with the same minor number, calls open_helper(), and
137 * increments the device open count. If the open count was previous at zero,
138 * i.e., it's the first that the device is open, then calls setup().
139 */
drm_open(struct drm_minor * minor,int clone_id,int flags,cred_t * credp)140 int drm_open(struct drm_minor *minor, int clone_id, int flags, cred_t *credp)
141 {
142 struct drm_device *dev = minor->dev;
143 int retcode = 0;
144
145 DRM_DEBUG("minor->index=%d, clone_id=%d", minor->index, clone_id);
146
147 retcode = drm_open_helper(minor, clone_id, flags, credp);
148 if (!retcode) {
149 atomic_inc(&dev->counts[_DRM_STAT_OPENS]);
150 spin_lock(&dev->count_lock);
151 if (!dev->open_count++) {
152 spin_unlock(&dev->count_lock);
153 retcode = drm_setup(dev);
154 goto out;
155 }
156 spin_unlock(&dev->count_lock);
157 }
158 out:
159 return retcode;
160 }
161
162 /**
163 * Called whenever a process opens /dev/drm.
164 *
165 * Creates and initializes a drm_file structure for the file private data in \p
166 * filp and add it into the double linked list in \p dev.
167 */
drm_open_helper(struct drm_minor * minor,int clone_id,int flags,cred_t * credp)168 static int drm_open_helper(struct drm_minor *minor,
169 int clone_id, int flags, cred_t *credp)
170 {
171 struct drm_device *dev = minor->dev;
172 struct drm_file *priv;
173 int minor_id = minor->index;
174 int ret;
175
176 if (flags & FEXCL)
177 return -EBUSY; /* No exclusive opens */
178
179 if (dev->switch_power_state != DRM_SWITCH_POWER_ON)
180 return -EINVAL;
181
182 DRM_DEBUG("pid = %d, minor = %d\n", ddi_get_pid(), minor_id);
183
184 priv = kmalloc(sizeof(*priv), GFP_KERNEL);
185 if (!priv)
186 return -ENOMEM;
187
188 (void) memset(priv, 0, sizeof(*priv));
189 (void) idr_replace(&minor->clone_idr, priv, clone_id); /* OSOL_drm */
190 priv->uid = crgetsuid(credp);
191 priv->pid = ddi_get_pid();
192 priv->minor = minor;
193 priv->ioctl_count = 0;
194 /* for compatibility root is always authenticated */
195 priv->authenticated = DRM_SUSER(credp);
196 priv->lock_count = 0;
197
198 INIT_LIST_HEAD(&priv->lhead);
199 INIT_LIST_HEAD(&priv->fbs);
200 mutex_init(&priv->fbs_lock, NULL, MUTEX_DRIVER, NULL);
201 INIT_LIST_HEAD(&priv->event_list);
202 DRM_INIT_WAITQUEUE(&priv->event_wait, DRM_INTR_PRI(dev));
203 priv->event_space = 4096; /* set aside 4k for event buffer */
204
205 if (dev->driver->driver_features & DRIVER_GEM)
206 drm_gem_open(dev, priv);
207
208 if (dev->driver->open) {
209 ret = dev->driver->open(dev, priv);
210 if (ret < 0)
211 goto out_free;
212 }
213
214
215 /* if there is no current master make this fd it */
216 mutex_lock(&dev->struct_mutex);
217 if (!priv->minor->master) {
218 /* create a new master */
219 priv->minor->master = drm_master_create(priv->minor);
220 if (!priv->minor->master) {
221 mutex_unlock(&dev->struct_mutex);
222 ret = -ENOMEM;
223 goto out_free;
224 }
225
226 priv->is_master = 1;
227 /* take another reference for the copy in the local file priv */
228 priv->master = drm_master_get(priv->minor->master);
229
230 priv->authenticated = 1;
231
232 mutex_unlock(&dev->struct_mutex);
233 if (dev->driver->master_create) {
234 ret = dev->driver->master_create(dev, priv->master);
235 if (ret) {
236 mutex_lock(&dev->struct_mutex);
237 /* drop both references if this fails */
238 drm_master_put(&priv->minor->master);
239 drm_master_put(&priv->master);
240 mutex_unlock(&dev->struct_mutex);
241 goto out_free;
242 }
243 }
244 mutex_lock(&dev->struct_mutex);
245 if (dev->driver->master_set) {
246 ret = dev->driver->master_set(dev, priv, true);
247 if (ret) {
248 /* drop both references if this fails */
249 drm_master_put(&priv->minor->master);
250 drm_master_put(&priv->master);
251 mutex_unlock(&dev->struct_mutex);
252 goto out_free;
253 }
254 }
255 mutex_unlock(&dev->struct_mutex);
256 } else {
257 /* get a reference to the master */
258 priv->master = drm_master_get(priv->minor->master);
259 mutex_unlock(&dev->struct_mutex);
260 }
261
262 mutex_lock(&dev->struct_mutex);
263 list_add(&priv->lhead, &dev->filelist, (caddr_t)priv);
264 mutex_unlock(&dev->struct_mutex);
265
266 return 0;
267 out_free:
268 kfree(priv, sizeof (*priv));
269 return ret;
270 }
271
drm_master_release(struct drm_device * dev,struct drm_file * fpriv)272 void drm_master_release(struct drm_device *dev, struct drm_file *fpriv)
273 {
274 struct drm_master *master = fpriv->master;
275
276 if (drm_i_have_hw_lock(dev, fpriv)) {
277 DRM_DEBUG("Process %d dead, freeing lock for context %d",
278 DRM_CURRENTPID, _DRM_LOCKING_CONTEXT(master->lock.hw_lock->lock));
279 (void) drm_lock_free(&master->lock,
280 _DRM_LOCKING_CONTEXT(master->lock.hw_lock->lock));
281 }
282
283 }
284
drm_events_release(struct drm_file * file_priv)285 static void drm_events_release(struct drm_file *file_priv)
286 {
287 struct drm_device *dev = file_priv->minor->dev;
288 struct drm_pending_event *e, *et;
289 struct drm_pending_vblank_event *v, *vt;
290 unsigned long flags;
291
292 spin_lock_irqsave(&dev->event_lock, flags);
293
294 /* Remove pending flips */
295 list_for_each_entry_safe(v, vt, struct drm_pending_vblank_event, &dev->vblank_event_list, base.link)
296 if (v->base.file_priv == file_priv) {
297 list_del(&v->base.link);
298 drm_vblank_put(dev, v->pipe);
299 v->base.destroy(&v->base, sizeof(struct drm_pending_vblank_event));
300 }
301
302 /* Remove unconsumed events */
303 list_for_each_entry_safe(e, et, struct drm_pending_event, &file_priv->event_list, link)
304 e->destroy(e, sizeof(struct drm_pending_vblank_event));
305
306 spin_unlock_irqrestore(&dev->event_lock, flags);
307 }
308
309 /**
310 * Release file.
311 *
312 * \return zero on success or a negative number on failure.
313 *
314 * If the hardware lock is held then free it, and take it again for the kernel
315 * context since it's necessary to reclaim buffers. Unlink the file private
316 * data from its list and free it. Decreases the open count and if it reaches
317 * zero calls drm_lastclose().
318 */
319 int
drm_release(struct drm_file * file_priv)320 drm_release(struct drm_file *file_priv)
321 {
322 struct drm_device *dev = file_priv->minor->dev;
323 int retcode = 0;
324
325
326
327 DRM_DEBUG("open_count = %d\n", dev->open_count);
328
329 if (dev->driver->preclose)
330 dev->driver->preclose(dev, file_priv);
331
332 /* ========================================================
333 * Begin inline drm_release
334 */
335
336 /* Release any auth tokens that might point to this file_priv,
337 (do that under the drm_global_mutex) */
338 if (file_priv->magic)
339 (void) drm_remove_magic(file_priv->master, file_priv->magic);
340
341 /* if the master has gone away we can't do anything with the lock */
342 if (file_priv->minor->master)
343 drm_master_release(dev, file_priv);
344
345 if (drm_core_check_feature(dev, DRIVER_HAVE_DMA))
346 drm_core_reclaim_buffers(dev, file_priv);
347
348 drm_events_release(file_priv);
349
350 if (dev->driver->driver_features & DRIVER_MODESET)
351 drm_fb_release(file_priv);
352
353 if (dev->driver->driver_features & DRIVER_GEM)
354 drm_gem_release(dev, file_priv);
355
356 mutex_lock(&dev->ctxlist_mutex);
357 if (!list_empty(&dev->ctxlist)) {
358 struct drm_ctx_list *pos, *n;
359
360 list_for_each_entry_safe(pos, n, struct drm_ctx_list, &dev->ctxlist, head) {
361 if (pos->tag == file_priv &&
362 pos->handle != DRM_KERNEL_CONTEXT) {
363 if (dev->driver->context_dtor)
364 dev->driver->context_dtor(dev,
365 pos->handle);
366
367 drm_ctxbitmap_free(dev, pos->handle);
368
369 list_del(&pos->head);
370 kfree(pos, sizeof (*pos));
371 --dev->ctx_count;
372 }
373 }
374 }
375 mutex_unlock(&dev->ctxlist_mutex);
376
377 mutex_lock(&dev->struct_mutex);
378
379 if (file_priv->is_master) {
380 struct drm_master *master = file_priv->master;
381 struct drm_file *temp;
382 list_for_each_entry(temp, struct drm_file, &dev->filelist, lhead) {
383 if ((temp->master == file_priv->master) &&
384 (temp != file_priv))
385 temp->authenticated = 0;
386 }
387
388 /**
389 * Since the master is disappearing, so is the
390 * possibility to lock.
391 */
392
393 if (master->lock.hw_lock) {
394 master->lock.hw_lock = NULL;
395 master->lock.file_priv = NULL;
396 }
397
398 if (file_priv->minor->master == file_priv->master) {
399 /* drop the reference held my the minor */
400 if (dev->driver->master_drop)
401 dev->driver->master_drop(dev, file_priv, true);
402 drm_master_put(&file_priv->minor->master);
403 }
404 }
405
406 /* drop the reference held my the file priv */
407 drm_master_put(&file_priv->master);
408 file_priv->is_master = 0;
409 list_del(&file_priv->lhead);
410 mutex_unlock(&dev->struct_mutex);
411
412 if (dev->driver->postclose)
413 dev->driver->postclose(dev, file_priv);
414 kfree(file_priv, sizeof (*file_priv));
415
416 /* ========================================================
417 * End inline drm_release
418 */
419
420 atomic_inc(&dev->counts[_DRM_STAT_CLOSES]);
421 spin_lock(&dev->count_lock);
422 if (!--dev->open_count) {
423 if (atomic_read(&dev->ioctl_count)) {
424 DRM_ERROR("Device busy: %d\n",
425 atomic_read(&dev->ioctl_count));
426 spin_unlock(&dev->count_lock);
427 return -EBUSY;
428 }
429 spin_unlock(&dev->count_lock);
430 return drm_lastclose(dev);
431 }
432 spin_unlock(&dev->count_lock);
433
434 return retcode;
435 }
436
437 static bool
drm_dequeue_event(struct drm_file * file_priv,size_t total,size_t max,struct drm_pending_event ** out)438 drm_dequeue_event(struct drm_file *file_priv,
439 size_t total, size_t max, struct drm_pending_event **out)
440 {
441 struct drm_device *dev = file_priv->minor->dev;
442 struct drm_pending_event *e;
443 unsigned long flags;
444 bool ret = false;
445
446 spin_lock_irqsave(&dev->event_lock, flags);
447
448 *out = NULL;
449 if (list_empty(&file_priv->event_list))
450 goto out;
451 e = list_first_entry(&file_priv->event_list,
452 struct drm_pending_event, link);
453 if (e->event->length + total > max)
454 goto out;
455
456 file_priv->event_space += e->event->length;
457 list_del(&e->link);
458 *out = e;
459 ret = true;
460
461 out:
462 spin_unlock_irqrestore(&dev->event_lock, flags);
463 return ret;
464 }
465
drm_read(struct drm_file * file_priv,struct uio * uiop)466 ssize_t drm_read(struct drm_file *file_priv, struct uio *uiop)
467 {
468 struct drm_pending_event *e;
469 size_t total;
470 int ret = 0;
471
472 DRM_WAIT(ret, &file_priv->event_wait,
473 !list_empty(&file_priv->event_list));
474 if (ret < 0) {
475 DRM_ERROR("returns %d event_list is %d", ret, list_empty(&file_priv->event_list));
476 return ret;
477 }
478
479 total = 0;
480 while (drm_dequeue_event(file_priv, total, uiop->uio_iov->iov_len, &e)) {
481 ret = uiomove((caddr_t)e->event, e->event->length, UIO_READ, uiop);
482 if (ret) {
483 DRM_ERROR("Failed to copy to user: %d", ret);
484 return (0);
485 }
486 total += e->event->length;
487 e->destroy(e, sizeof(struct drm_pending_vblank_event));
488 }
489
490 return total;
491 }
492
drm_poll(struct drm_file * file_priv,short events)493 short drm_poll(struct drm_file *file_priv, short events)
494 {
495 short revent = 0;
496
497 if (!list_empty(&file_priv->event_list)) {
498 if (events & POLLIN)
499 revent |= POLLIN;
500 if (events & POLLRDNORM)
501 revent |= POLLRDNORM;
502 }
503
504 return revent;
505 }
506
507
508