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 retcode = devfs_set_cdevpriv(priv, drm_close); 61 if (retcode != 0) { 62 free(priv, DRM_MEM_FILES); 63 return retcode; 64 } 65 66 DRM_LOCK(dev); 67 priv->dev = dev; 68 priv->uid = p->td_ucred->cr_svuid; 69 priv->pid = p->td_proc->p_pid; 70 priv->ioctl_count = 0; 71 72 /* for compatibility root is always authenticated */ 73 priv->authenticated = DRM_SUSER(p); 74 75 INIT_LIST_HEAD(&priv->fbs); 76 INIT_LIST_HEAD(&priv->event_list); 77 priv->event_space = 4096; /* set aside 4k for event buffer */ 78 79 if (dev->driver->driver_features & DRIVER_GEM) 80 drm_gem_open(dev, priv); 81 82 if (dev->driver->open) { 83 /* shared code returns -errno */ 84 retcode = -dev->driver->open(dev, priv); 85 if (retcode != 0) { 86 devfs_clear_cdevpriv(); 87 free(priv, DRM_MEM_FILES); 88 DRM_UNLOCK(dev); 89 return retcode; 90 } 91 } 92 93 /* first opener automatically becomes master */ 94 priv->master = TAILQ_EMPTY(&dev->files); 95 96 TAILQ_INSERT_TAIL(&dev->files, priv, link); 97 DRM_UNLOCK(dev); 98 kdev->si_drv1 = dev; 99 return 0; 100 } 101 102 static bool 103 drm_dequeue_event(struct drm_device *dev, struct drm_file *file_priv, 104 struct uio *uio, struct drm_pending_event **out) 105 { 106 struct drm_pending_event *e; 107 108 if (list_empty(&file_priv->event_list)) 109 return (false); 110 e = list_first_entry(&file_priv->event_list, 111 struct drm_pending_event, link); 112 if (e->event->length > uio->uio_resid) 113 return (false); 114 115 file_priv->event_space += e->event->length; 116 list_del(&e->link); 117 *out = e; 118 return (true); 119 } 120 121 int 122 drm_read(struct cdev *kdev, struct uio *uio, int ioflag) 123 { 124 struct drm_file *file_priv; 125 struct drm_device *dev; 126 struct drm_pending_event *e; 127 int error; 128 129 error = devfs_get_cdevpriv((void **)&file_priv); 130 if (error != 0) { 131 DRM_ERROR("can't find authenticator\n"); 132 return (EINVAL); 133 } 134 dev = drm_get_device_from_kdev(kdev); 135 mtx_lock(&dev->event_lock); 136 while (list_empty(&file_priv->event_list)) { 137 if ((ioflag & O_NONBLOCK) != 0) { 138 error = EAGAIN; 139 goto out; 140 } 141 error = msleep(&file_priv->event_space, &dev->event_lock, 142 PCATCH, "drmrea", 0); 143 if (error != 0) 144 goto out; 145 } 146 while (drm_dequeue_event(dev, file_priv, uio, &e)) { 147 mtx_unlock(&dev->event_lock); 148 error = uiomove(e->event, e->event->length, uio); 149 CTR3(KTR_DRM, "drm_event_dequeued %d %d %d", curproc->p_pid, 150 e->event->type, e->event->length); 151 e->destroy(e); 152 if (error != 0) 153 return (error); 154 mtx_lock(&dev->event_lock); 155 } 156 out: 157 mtx_unlock(&dev->event_lock); 158 return (error); 159 } 160 161 void 162 drm_event_wakeup(struct drm_pending_event *e) 163 { 164 struct drm_file *file_priv; 165 struct drm_device *dev; 166 167 file_priv = e->file_priv; 168 dev = file_priv->dev; 169 mtx_assert(&dev->event_lock, MA_OWNED); 170 171 wakeup(&file_priv->event_space); 172 selwakeup(&file_priv->event_poll); 173 } 174 175 int 176 drm_poll(struct cdev *kdev, int events, struct thread *td) 177 { 178 struct drm_file *file_priv; 179 struct drm_device *dev; 180 int error, revents; 181 182 error = devfs_get_cdevpriv((void **)&file_priv); 183 if (error != 0) { 184 DRM_ERROR("can't find authenticator\n"); 185 return (EINVAL); 186 } 187 dev = drm_get_device_from_kdev(kdev); 188 189 revents = 0; 190 mtx_lock(&dev->event_lock); 191 if ((events & (POLLIN | POLLRDNORM)) != 0) { 192 if (list_empty(&file_priv->event_list)) { 193 CTR0(KTR_DRM, "drm_poll empty list"); 194 selrecord(td, &file_priv->event_poll); 195 } else { 196 revents |= events & (POLLIN | POLLRDNORM); 197 CTR1(KTR_DRM, "drm_poll revents %x", revents); 198 } 199 } 200 mtx_unlock(&dev->event_lock); 201 return (revents); 202 } 203