1 /*- 2 * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas. 3 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California. 4 * All Rights Reserved. 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a 7 * copy of this software and associated documentation files (the "Software"), 8 * to deal in the Software without restriction, including without limitation 9 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 10 * and/or sell copies of the Software, and to permit persons to whom the 11 * Software is furnished to do so, subject to the following conditions: 12 * 13 * The above copyright notice and this permission notice (including the next 14 * paragraph) shall be included in all copies or substantial portions of the 15 * Software. 16 * 17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 20 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR 21 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 22 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 23 * OTHER DEALINGS IN THE SOFTWARE. 24 * 25 * Authors: 26 * Rickard E. (Rik) Faith <faith@valinux.com> 27 * Daryll Strauss <daryll@valinux.com> 28 * Gareth Hughes <gareth@valinux.com> 29 * 30 */ 31 32 #include <sys/cdefs.h> 33 __FBSDID("$FreeBSD$"); 34 35 /** @file drm_fops.c 36 * Support code for dealing with the file privates associated with each 37 * open of the DRM device. 38 */ 39 40 #include <dev/drm2/drmP.h> 41 42 /* drm_open_helper is called whenever a process opens /dev/drm. */ 43 int drm_open_helper(struct cdev *kdev, int flags, int fmt, DRM_STRUCTPROC *p, 44 struct drm_device *dev) 45 { 46 struct drm_file *priv; 47 int retcode; 48 49 if (flags & O_EXCL) 50 return EBUSY; /* No exclusive opens */ 51 dev->flags = flags; 52 53 DRM_DEBUG("pid = %d, device = %s\n", DRM_CURRENTPID, devtoname(kdev)); 54 55 priv = malloc(sizeof(*priv), DRM_MEM_FILES, M_NOWAIT | M_ZERO); 56 if (priv == NULL) { 57 return ENOMEM; 58 } 59 60 DRM_LOCK(dev); 61 priv->dev = dev; 62 priv->uid = p->td_ucred->cr_svuid; 63 priv->pid = p->td_proc->p_pid; 64 priv->ioctl_count = 0; 65 66 /* for compatibility root is always authenticated */ 67 priv->authenticated = DRM_SUSER(p); 68 69 INIT_LIST_HEAD(&priv->fbs); 70 INIT_LIST_HEAD(&priv->event_list); 71 priv->event_space = 4096; /* set aside 4k for event buffer */ 72 73 if (dev->driver->driver_features & DRIVER_GEM) 74 drm_gem_open(dev, priv); 75 76 if (dev->driver->open) { 77 /* shared code returns -errno */ 78 retcode = -dev->driver->open(dev, priv); 79 if (retcode != 0) { 80 free(priv, DRM_MEM_FILES); 81 DRM_UNLOCK(dev); 82 return retcode; 83 } 84 } 85 86 /* first opener automatically becomes master */ 87 priv->master = TAILQ_EMPTY(&dev->files); 88 89 TAILQ_INSERT_TAIL(&dev->files, priv, link); 90 DRM_UNLOCK(dev); 91 kdev->si_drv1 = dev; 92 93 retcode = devfs_set_cdevpriv(priv, drm_close); 94 if (retcode != 0) 95 drm_close(priv); 96 97 return (retcode); 98 } 99 100 static bool 101 drm_dequeue_event(struct drm_device *dev, struct drm_file *file_priv, 102 struct uio *uio, struct drm_pending_event **out) 103 { 104 struct drm_pending_event *e; 105 106 if (list_empty(&file_priv->event_list)) 107 return (false); 108 e = list_first_entry(&file_priv->event_list, 109 struct drm_pending_event, link); 110 if (e->event->length > uio->uio_resid) 111 return (false); 112 113 file_priv->event_space += e->event->length; 114 list_del(&e->link); 115 *out = e; 116 return (true); 117 } 118 119 int 120 drm_read(struct cdev *kdev, struct uio *uio, int ioflag) 121 { 122 struct drm_file *file_priv; 123 struct drm_device *dev; 124 struct drm_pending_event *e; 125 int error; 126 127 error = devfs_get_cdevpriv((void **)&file_priv); 128 if (error != 0) { 129 DRM_ERROR("can't find authenticator\n"); 130 return (EINVAL); 131 } 132 dev = drm_get_device_from_kdev(kdev); 133 mtx_lock(&dev->event_lock); 134 while (list_empty(&file_priv->event_list)) { 135 if ((ioflag & O_NONBLOCK) != 0) { 136 error = EAGAIN; 137 goto out; 138 } 139 error = msleep(&file_priv->event_space, &dev->event_lock, 140 PCATCH, "drmrea", 0); 141 if (error != 0) 142 goto out; 143 } 144 while (drm_dequeue_event(dev, file_priv, uio, &e)) { 145 mtx_unlock(&dev->event_lock); 146 error = uiomove(e->event, e->event->length, uio); 147 CTR3(KTR_DRM, "drm_event_dequeued %d %d %d", curproc->p_pid, 148 e->event->type, e->event->length); 149 e->destroy(e); 150 if (error != 0) 151 return (error); 152 mtx_lock(&dev->event_lock); 153 } 154 out: 155 mtx_unlock(&dev->event_lock); 156 return (error); 157 } 158 159 void 160 drm_event_wakeup(struct drm_pending_event *e) 161 { 162 struct drm_file *file_priv; 163 struct drm_device *dev; 164 165 file_priv = e->file_priv; 166 dev = file_priv->dev; 167 mtx_assert(&dev->event_lock, MA_OWNED); 168 169 wakeup(&file_priv->event_space); 170 selwakeup(&file_priv->event_poll); 171 } 172 173 int 174 drm_poll(struct cdev *kdev, int events, struct thread *td) 175 { 176 struct drm_file *file_priv; 177 struct drm_device *dev; 178 int error, revents; 179 180 error = devfs_get_cdevpriv((void **)&file_priv); 181 if (error != 0) { 182 DRM_ERROR("can't find authenticator\n"); 183 return (EINVAL); 184 } 185 dev = drm_get_device_from_kdev(kdev); 186 187 revents = 0; 188 mtx_lock(&dev->event_lock); 189 if ((events & (POLLIN | POLLRDNORM)) != 0) { 190 if (list_empty(&file_priv->event_list)) { 191 CTR0(KTR_DRM, "drm_poll empty list"); 192 selrecord(td, &file_priv->event_poll); 193 } else { 194 revents |= events & (POLLIN | POLLRDNORM); 195 CTR1(KTR_DRM, "drm_poll revents %x", revents); 196 } 197 } 198 mtx_unlock(&dev->event_lock); 199 return (revents); 200 } 201