3 * File operations for DRM
5 * \author Rickard E. (Rik) Faith <faith@valinux.com>
6 * \author Daryll Strauss <daryll@valinux.com>
7 * \author Gareth Hughes <gareth@valinux.com>
11 * Created: Mon Jan 4 08:58:31 1999 by faith@valinux.com
13 * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
14 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
15 * All Rights Reserved.
17 * Permission is hereby granted, free of charge, to any person obtaining a
18 * copy of this software and associated documentation files (the "Software"),
19 * to deal in the Software without restriction, including without limitation
20 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
21 * and/or sell copies of the Software, and to permit persons to whom the
22 * Software is furnished to do so, subject to the following conditions:
24 * The above copyright notice and this permission notice (including the next
25 * paragraph) shall be included in all copies or substantial portions of the
28 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
29 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
30 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
31 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
32 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
33 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
34 * OTHER DEALINGS IN THE SOFTWARE.
36 * $FreeBSD: src/sys/dev/drm2/drm_fops.c,v 1.1 2012/05/22 11:07:44 kib Exp $
39 #include <sys/types.h>
41 #include <sys/devfs.h>
45 extern drm_pci_id_list_t *drm_find_description(int vendor, int device,
46 drm_pci_id_list_t *idlist);
47 extern devclass_t drm_devclass;
49 static int drm_setup(struct drm_device *dev)
56 /* prebuild the SAREA */
57 i = drm_addmap(dev, 0, SAREA_MAX, _DRM_SHM,
58 _DRM_CONTAINS_LOCK, &map);
62 if (dev->driver->firstopen)
63 dev->driver->firstopen(dev);
67 if (drm_core_check_feature(dev, DRIVER_HAVE_DMA)) {
68 i = drm_dma_setup(dev);
73 for (i = 0; i < DRM_HASH_SIZE; i++) {
74 dev->magiclist[i].head = NULL;
75 dev->magiclist[i].tail = NULL;
78 init_waitqueue_head(&dev->lock.lock_queue);
79 if (!drm_core_check_feature(dev, DRIVER_MODESET))
81 dev->context_flag = 0;
82 dev->last_context = 0;
85 dev->buf_sigio = NULL;
92 #define DRIVER_SOFTC(unit) \
93 ((struct drm_device *)devclass_get_softc(drm_devclass, unit))
96 drm_open(struct dev_open_args *ap)
98 struct cdev *kdev = ap->a_head.a_dev;
99 int flags = ap->a_oflags;
101 struct thread *p = curthread;
102 struct drm_device *dev;
105 dev = DRIVER_SOFTC(minor(kdev));
109 DRM_DEBUG("open_count = %d\n", dev->open_count);
111 retcode = drm_open_helper(kdev, flags, fmt, p, dev, ap->a_fp);
114 atomic_inc(&dev->counts[_DRM_STAT_OPENS]);
116 device_busy(dev->dev);
117 if (!dev->open_count++)
118 retcode = drm_setup(dev);
122 DRM_DEBUG("return %d\n", retcode);
127 /* drm_open_helper is called whenever a process opens /dev/drm. */
128 int drm_open_helper(struct cdev *kdev, int flags, int fmt, DRM_STRUCTPROC *p,
129 struct drm_device *dev, struct file *fp)
131 struct drm_file *priv;
135 return EBUSY; /* No exclusive opens */
138 DRM_DEBUG("pid = %d, device = %s\n", DRM_CURRENTPID, devtoname(kdev));
140 priv = kmalloc(sizeof(*priv), M_DRM, M_WAITOK | M_NULLOK | M_ZERO);
147 priv->uid = p->td_proc->p_ucred->cr_svuid;
148 priv->pid = p->td_proc->p_pid;
149 priv->ioctl_count = 0;
151 /* for compatibility root is always authenticated */
152 priv->authenticated = DRM_SUSER(p);
154 INIT_LIST_HEAD(&priv->fbs);
155 INIT_LIST_HEAD(&priv->event_list);
156 init_waitqueue_head(&priv->event_wait);
157 priv->event_space = 4096; /* set aside 4k for event buffer */
159 if (dev->driver->driver_features & DRIVER_GEM)
160 drm_gem_open(dev, priv);
162 if (dev->driver->open) {
163 /* shared code returns -errno */
164 retcode = -dev->driver->open(dev, priv);
166 drm_free(priv, M_DRM);
172 /* first opener automatically becomes master */
173 priv->master = list_empty(&dev->filelist);
175 list_add(&priv->lhead, &dev->filelist);
179 retcode = devfs_set_cdevpriv(fp, priv, &drm_cdevpriv_dtor);
181 drm_cdevpriv_dtor(priv);
189 * \param inode device inode
190 * \param file_priv DRM file private.
191 * \return zero on success or a negative number on failure.
193 * If the hardware lock is held then free it, and take it again for the kernel
194 * context since it's necessary to reclaim buffers. Unlink the file private
195 * data from its list and free it. Decreases the open count and if it reaches
196 * zero calls drm_lastclose().
199 #if 0 /* old drm_release equivalent from DragonFly */
200 void drm_cdevpriv_dtor(void *cd)
202 struct drm_file *file_priv = cd;
203 struct drm_device *dev = file_priv->dev;
206 DRM_DEBUG("open_count = %d\n", dev->open_count);
210 if (dev->driver->preclose != NULL)
211 dev->driver->preclose(dev, file_priv);
213 /* ========================================================
214 * Begin inline drm_release
217 DRM_DEBUG("pid = %d, device = 0x%lx, open_count = %d\n",
218 DRM_CURRENTPID, (long)dev->dev, dev->open_count);
220 if (dev->driver->driver_features & DRIVER_GEM)
221 drm_gem_release(dev, file_priv);
223 if (dev->primary->master->lock.hw_lock
224 && _DRM_LOCK_IS_HELD(dev->primary->master->lock.hw_lock->lock)
225 && dev->primary->master->lock.file_priv == file_priv) {
226 DRM_DEBUG("Process %d dead, freeing lock for context %d\n",
228 _DRM_LOCKING_CONTEXT(dev->primary->master->lock.hw_lock->lock));
229 if (dev->driver->reclaim_buffers_locked != NULL)
230 dev->driver->reclaim_buffers_locked(dev, file_priv);
232 drm_lock_free(&dev->primary->master->lock,
233 _DRM_LOCKING_CONTEXT(dev->primary->master->lock.hw_lock->lock));
235 /* FIXME: may require heavy-handed reset of
236 hardware at this point, possibly
237 processed via a callback to the X
239 } else if (dev->driver->reclaim_buffers_locked != NULL &&
240 dev->primary->master->lock.hw_lock != NULL) {
241 /* The lock is required to reclaim buffers */
243 if (!dev->primary->master->lock.hw_lock) {
244 /* Device has been unregistered */
248 if (drm_lock_take(&dev->primary->master->lock, DRM_KERNEL_CONTEXT)) {
249 dev->primary->master->lock.file_priv = file_priv;
250 dev->primary->master->lock.lock_time = jiffies;
251 atomic_inc(&dev->counts[_DRM_STAT_LOCKS]);
252 break; /* Got lock */
255 retcode = DRM_LOCK_SLEEP(dev, &dev->primary->master->lock.lock_queue,
256 PCATCH, "drmlk2", 0);
261 dev->driver->reclaim_buffers_locked(dev, file_priv);
262 drm_lock_free(&dev->primary->master->lock, DRM_KERNEL_CONTEXT);
266 if (drm_core_check_feature(dev, DRIVER_HAVE_DMA) &&
267 !dev->driver->reclaim_buffers_locked)
268 drm_reclaim_buffers(dev, file_priv);
270 funsetown(&dev->buf_sigio);
272 if (dev->driver->postclose != NULL)
273 dev->driver->postclose(dev, file_priv);
274 list_del(&file_priv->lhead);
277 /* ========================================================
278 * End inline drm_release
281 atomic_inc(&dev->counts[_DRM_STAT_CLOSES]);
282 device_unbusy(dev->dev);
283 if (--dev->open_count == 0) {
284 retcode = drm_lastclose(dev);
291 static void drm_unload(struct drm_device *dev)
297 drm_sysctl_cleanup(dev);
298 if (dev->devnode != NULL)
299 destroy_dev(dev->devnode);
301 drm_ctxbitmap_cleanup(dev);
303 if (dev->driver->driver_features & DRIVER_GEM)
304 drm_gem_destroy(dev);
306 if (dev->agp && dev->agp->agp_mtrr) {
307 int __unused retcode;
309 retcode = drm_mtrr_del(0, dev->agp->agp_info.ai_aperture_base,
310 dev->agp->agp_info.ai_aperture_size, DRM_MTRR_WC);
311 DRM_DEBUG("mtrr_del = %d", retcode);
314 drm_vblank_cleanup(dev);
320 /* Clean up PCI resources allocated by drm_bufs.c. We're not really
321 * worried about resource consumption while the DRM is inactive (between
322 * lastclose and firstopen or unload) because these aren't actually
323 * taking up KVA, just keeping the PCI resource allocated.
325 for (i = 0; i < DRM_MAX_PCI_RESOURCE; i++) {
326 if (dev->pcir[i] == NULL)
328 bus_release_resource(dev->dev, SYS_RES_MEMORY,
329 dev->pcirid[i], dev->pcir[i]);
334 drm_free(dev->agp, M_DRM);
338 if (dev->driver->unload != NULL) {
340 dev->driver->unload(dev);
346 if (pci_disable_busmaster(dev->dev))
347 DRM_ERROR("Request to disable bus-master failed.\n");
349 lockuninit(&dev->vbl_lock);
350 lockuninit(&dev->dev_lock);
351 lockuninit(&dev->event_lock);
352 lockuninit(&dev->struct_mutex);
355 int drm_release(device_t kdev)
357 struct drm_device *dev;
359 dev = device_get_softc(kdev);
362 bus_release_resource(dev->dev, SYS_RES_IRQ, dev->irqrid,
364 if (dev->msi_enabled) {
365 pci_release_msi(dev->dev);
366 DRM_INFO("MSI released\n");
373 drm_dequeue_event(struct drm_device *dev, struct drm_file *file_priv,
374 struct uio *uio, struct drm_pending_event **out)
376 struct drm_pending_event *e;
378 if (list_empty(&file_priv->event_list))
380 e = list_first_entry(&file_priv->event_list,
381 struct drm_pending_event, link);
382 if (e->event->length > uio->uio_resid)
385 file_priv->event_space += e->event->length;
392 drm_read(struct dev_read_args *ap)
394 struct cdev *kdev = ap->a_head.a_dev;
395 struct uio *uio = ap->a_uio;
396 int ioflag = ap->a_ioflag;
397 struct drm_file *file_priv;
398 struct drm_device *dev;
399 struct drm_pending_event *e;
402 error = devfs_get_cdevpriv(ap->a_fp, (void **)&file_priv);
404 DRM_ERROR("can't find authenticator\n");
407 dev = drm_get_device_from_kdev(kdev);
408 lockmgr(&dev->event_lock, LK_EXCLUSIVE);
409 while (list_empty(&file_priv->event_list)) {
410 if ((ioflag & O_NONBLOCK) != 0) {
414 error = lksleep(&file_priv->event_space, &dev->event_lock,
415 PCATCH, "drmrea", 0);
419 while (drm_dequeue_event(dev, file_priv, uio, &e)) {
420 lockmgr(&dev->event_lock, LK_RELEASE);
421 error = uiomove((caddr_t)e->event, e->event->length, uio);
425 lockmgr(&dev->event_lock, LK_EXCLUSIVE);
428 lockmgr(&dev->event_lock, LK_RELEASE);
433 drm_event_wakeup(struct drm_pending_event *e)
435 struct drm_file *file_priv;
436 struct drm_device *dev;
438 file_priv = e->file_priv;
439 dev = file_priv->dev;
440 KKASSERT(lockstatus(&dev->event_lock, curthread) != 0);
442 wakeup(&file_priv->event_space);
443 KNOTE(&file_priv->dkq.ki_note, 0);
447 drmfilt(struct knote *kn, long hint)
449 struct drm_file *file_priv;
450 struct drm_device *dev;
453 file_priv = (struct drm_file *)kn->kn_hook;
454 dev = file_priv->dev;
455 lockmgr(&dev->event_lock, LK_EXCLUSIVE);
456 if (!list_empty(&file_priv->event_list))
458 lockmgr(&dev->event_lock, LK_RELEASE);
464 drmfilt_detach(struct knote *kn)
466 struct drm_file *file_priv;
467 struct drm_device *dev;
470 file_priv = (struct drm_file *)kn->kn_hook;
471 dev = file_priv->dev;
473 lockmgr(&dev->event_lock, LK_EXCLUSIVE);
474 klist = &file_priv->dkq.ki_note;
475 knote_remove(klist, kn);
476 lockmgr(&dev->event_lock, LK_RELEASE);
479 static struct filterops drmfiltops =
480 { FILTEROP_ISFD, NULL, drmfilt_detach, drmfilt };
483 drm_kqfilter(struct dev_kqfilter_args *ap)
485 struct cdev *kdev = ap->a_head.a_dev;
486 struct drm_file *file_priv;
487 struct drm_device *dev;
488 struct knote *kn = ap->a_kn;
492 error = devfs_get_cdevpriv(ap->a_fp, (void **)&file_priv);
494 DRM_ERROR("can't find authenticator\n");
497 dev = drm_get_device_from_kdev(kdev);
501 switch (kn->kn_filter) {
504 kn->kn_fop = &drmfiltops;
505 kn->kn_hook = (caddr_t)file_priv;
508 ap->a_result = EOPNOTSUPP;
512 lockmgr(&dev->event_lock, LK_EXCLUSIVE);
513 klist = &file_priv->dkq.ki_note;
514 knote_insert(klist, kn);
515 lockmgr(&dev->event_lock, LK_RELEASE);