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>
44 extern drm_pci_id_list_t *drm_find_description(int vendor, int device,
45 drm_pci_id_list_t *idlist);
46 extern devclass_t drm_devclass;
48 struct drm_file *drm_find_file_by_proc(struct drm_device *dev, DRM_STRUCTPROC *p)
50 uid_t uid = p->td_proc->p_ucred->cr_svuid;
51 pid_t pid = p->td_proc->p_pid;
52 struct drm_file *priv;
54 TAILQ_FOREACH(priv, &dev->files, link)
55 if (priv->pid == pid && priv->uid == uid)
60 static int drm_setup(struct drm_device *dev)
67 /* prebuild the SAREA */
68 i = drm_addmap(dev, 0, SAREA_MAX, _DRM_SHM,
69 _DRM_CONTAINS_LOCK, &map);
73 if (dev->driver->firstopen)
74 dev->driver->firstopen(dev);
78 if (drm_core_check_feature(dev, DRIVER_HAVE_DMA)) {
79 i = drm_dma_setup(dev);
84 for (i = 0; i < DRM_HASH_SIZE; i++) {
85 dev->magiclist[i].head = NULL;
86 dev->magiclist[i].tail = NULL;
89 dev->lock.lock_queue = 0;
90 if (!drm_core_check_feature(dev, DRIVER_MODESET))
92 dev->context_flag = 0;
93 dev->last_context = 0;
96 dev->buf_sigio = NULL;
103 #define DRIVER_SOFTC(unit) \
104 ((struct drm_device *)devclass_get_softc(drm_devclass, unit))
107 drm_open(struct dev_open_args *ap)
109 struct cdev *kdev = ap->a_head.a_dev;
110 int flags = ap->a_oflags;
112 struct thread *p = curthread;
113 struct drm_device *dev;
116 dev = DRIVER_SOFTC(minor(kdev));
120 DRM_DEBUG("open_count = %d\n", dev->open_count);
122 retcode = drm_open_helper(kdev, flags, fmt, p, dev);
125 atomic_inc(&dev->counts[_DRM_STAT_OPENS]);
127 device_busy(dev->dev);
128 if (!dev->open_count++)
129 retcode = drm_setup(dev);
133 DRM_DEBUG("return %d\n", retcode);
138 /* drm_open_helper is called whenever a process opens /dev/drm. */
139 int drm_open_helper(struct cdev *kdev, int flags, int fmt, DRM_STRUCTPROC *p,
140 struct drm_device *dev)
142 struct drm_file *priv;
146 return EBUSY; /* No exclusive opens */
149 DRM_DEBUG("pid = %d, device = %s\n", DRM_CURRENTPID, devtoname(kdev));
152 priv = drm_find_file_by_proc(dev, p);
157 priv = kmalloc(sizeof(*priv), DRM_MEM_FILES, M_NOWAIT | M_ZERO);
165 priv->uid = p->td_proc->p_ucred->cr_svuid;
166 priv->pid = p->td_proc->p_pid;
167 priv->ioctl_count = 0;
169 /* for compatibility root is always authenticated */
170 priv->authenticated = DRM_SUSER(p);
172 INIT_LIST_HEAD(&priv->fbs);
173 INIT_LIST_HEAD(&priv->event_list);
174 priv->event_space = 4096; /* set aside 4k for event buffer */
176 if (dev->driver->driver_features & DRIVER_GEM)
177 drm_gem_open(dev, priv);
179 if (dev->driver->open) {
180 /* shared code returns -errno */
181 retcode = -dev->driver->open(dev, priv);
183 drm_free(priv, DRM_MEM_FILES);
189 /* first opener automatically becomes master */
190 priv->master = TAILQ_EMPTY(&dev->files);
192 TAILQ_INSERT_TAIL(&dev->files, priv, link);
199 drm_dequeue_event(struct drm_device *dev, struct drm_file *file_priv,
200 struct uio *uio, struct drm_pending_event **out)
202 struct drm_pending_event *e;
204 if (list_empty(&file_priv->event_list))
206 e = list_first_entry(&file_priv->event_list,
207 struct drm_pending_event, link);
208 if (e->event->length > uio->uio_resid)
211 file_priv->event_space += e->event->length;
218 drm_read(struct dev_read_args *ap)
220 struct cdev *kdev = ap->a_head.a_dev;
221 struct uio *uio = ap->a_uio;
222 int ioflag = ap->a_ioflag;
223 struct drm_file *file_priv;
224 struct drm_device *dev;
225 struct drm_pending_event *e;
228 dev = drm_get_device_from_kdev(kdev);
229 file_priv = drm_find_file_by_proc(dev, curthread);
231 lockmgr(&dev->event_lock, LK_EXCLUSIVE);
232 while (list_empty(&file_priv->event_list)) {
233 if ((ioflag & O_NONBLOCK) != 0) {
237 error = lksleep(&file_priv->event_space, &dev->event_lock,
238 PCATCH, "drmrea", 0);
242 while (drm_dequeue_event(dev, file_priv, uio, &e)) {
243 lockmgr(&dev->event_lock, LK_RELEASE);
244 error = uiomove((caddr_t)e->event, e->event->length, uio);
248 lockmgr(&dev->event_lock, LK_EXCLUSIVE);
251 lockmgr(&dev->event_lock, LK_RELEASE);
256 drm_event_wakeup(struct drm_pending_event *e)
258 struct drm_file *file_priv;
259 struct drm_device *dev;
261 file_priv = e->file_priv;
262 dev = file_priv->dev;
263 KKASSERT(lockstatus(&dev->event_lock, curthread) != 0);
265 wakeup(&file_priv->event_space);
269 drmfilt(struct knote *kn, long hint)
275 drmfilt_detach(struct knote *kn) {}
277 static struct filterops drmfiltops =
278 { FILTEROP_ISFD, NULL, drmfilt_detach, drmfilt };
281 drm_kqfilter(struct dev_kqfilter_args *ap)
283 struct knote *kn = ap->a_kn;
287 switch (kn->kn_filter) {
290 kn->kn_fop = &drmfiltops;
293 ap->a_result = EOPNOTSUPP;