/* fops.c -- File operations for DRM -*- c -*- * Created: Mon Jan 4 08:58:31 1999 by faith@precisioninsight.com * * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas. * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California. * All Rights Reserved. * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), * to deal in the Software without restriction, including without limitation * the rights to use, copy, modify, merge, publish, distribute, sublicense, * and/or sell copies of the Software, and to permit persons to whom the * Software is furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice (including the next * paragraph) shall be included in all copies or substantial portions of the * Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER * DEALINGS IN THE SOFTWARE. * * Authors: * Rickard E. (Rik) Faith * Daryll Strauss * */ #define __NO_VERSION__ #include "drmP.h" #include #include drm_file_t *drm_find_file_by_proc(drm_device_t *dev, struct proc *p) { uid_t uid = p->p_cred->p_svuid; pid_t pid = p->p_pid; drm_file_t *priv; TAILQ_FOREACH(priv, &dev->files, link) if (priv->pid == pid && priv->uid == uid) return priv; return NULL; } /* drm_open is called whenever a process opens /dev/drm. */ int drm_open_helper(dev_t kdev, int flags, int fmt, struct proc *p, drm_device_t *dev) { int m = minor(kdev); drm_file_t *priv; if (flags & O_EXCL) return EBUSY; /* No exclusive opens */ dev->flags = flags; DRM_DEBUG("pid = %d, device = %p, minor = %d\n", p->p_pid, dev->device, m); priv = drm_find_file_by_proc(dev, p); if (priv) { priv->refs++; } else { priv = drm_alloc(sizeof(*priv), DRM_MEM_FILES); memset(priv, 0, sizeof(*priv)); priv->uid = p->p_cred->p_svuid; priv->pid = p->p_pid; priv->refs = 1; priv->minor = m; priv->devXX = dev; priv->ioctl_count = 0; priv->authenticated = !suser(p); lockmgr(&dev->dev_lock, LK_EXCLUSIVE, 0, p); TAILQ_INSERT_TAIL(&dev->files, priv, link); lockmgr(&dev->dev_lock, LK_RELEASE, 0, p); } kdev->si_drv1 = dev; return 0; } int drm_write(dev_t kdev, struct uio *uio, int ioflag) { struct proc *p = curproc; drm_device_t *dev = kdev->si_drv1; DRM_DEBUG("pid = %d, device = %p, open_count = %d\n", p->p_pid, dev->device, dev->open_count); return 0; } /* drm_release is called whenever a process closes /dev/drm*. */ int drm_close(dev_t kdev, int fflag, int devtype, struct proc *p) { drm_device_t *dev = kdev->si_drv1; drm_file_t *priv; DRM_DEBUG("pid = %d, device = %p, open_count = %d\n", p->p_pid, dev->device, dev->open_count); priv = drm_find_file_by_proc(dev, p); if (!priv) { DRM_DEBUG("can't find authenticator\n"); return EINVAL; } if (dev->lock.hw_lock && _DRM_LOCK_IS_HELD(dev->lock.hw_lock->lock) && dev->lock.pid == p->p_pid) { DRM_ERROR("Process %d dead, freeing lock for context %d\n", p->p_pid, _DRM_LOCKING_CONTEXT(dev->lock.hw_lock->lock)); drm_lock_free(dev, &dev->lock.hw_lock->lock, _DRM_LOCKING_CONTEXT(dev->lock.hw_lock->lock)); /* FIXME: may require heavy-handed reset of hardware at this point, possibly processed via a callback to the X server. */ } drm_reclaim_buffers(dev, priv->pid); funsetown(dev->buf_sigio); lockmgr(&dev->dev_lock, LK_EXCLUSIVE, 0, p); priv = drm_find_file_by_proc(dev, p); if (priv) { priv->refs--; if (!priv->refs) { TAILQ_REMOVE(&dev->files, priv, link); drm_free(priv, sizeof(*priv), DRM_MEM_FILES); } } lockmgr(&dev->dev_lock, LK_RELEASE, 0, p); return 0; } /* The drm_read and drm_write_string code (especially that which manages the circular buffer), is based on Alessandro Rubini's LINUX DEVICE DRIVERS (Cambridge: O'Reilly, 1998), pages 111-113. */ ssize_t drm_read(dev_t kdev, struct uio *uio, int ioflag) { drm_device_t *dev = kdev->si_drv1; int left; int avail; int send; int cur; int error = 0; DRM_DEBUG("%p, %p\n", dev->buf_rp, dev->buf_wp); while (dev->buf_rp == dev->buf_wp) { DRM_DEBUG(" sleeping\n"); if (dev->flags & FASYNC) { return EWOULDBLOCK; } error = tsleep(&dev->buf_rp, PZERO|PCATCH, "drmrd", 0); if (error) { DRM_DEBUG(" interrupted\n"); return error; } DRM_DEBUG(" awake\n"); } left = (dev->buf_rp + DRM_BSZ - dev->buf_wp) % DRM_BSZ; avail = DRM_BSZ - left; send = DRM_MIN(avail, uio->uio_resid); while (send) { if (dev->buf_wp > dev->buf_rp) { cur = DRM_MIN(send, dev->buf_wp - dev->buf_rp); } else { cur = DRM_MIN(send, dev->buf_end - dev->buf_rp); } error = uiomove(dev->buf_rp, cur, uio); if (error) break; dev->buf_rp += cur; if (dev->buf_rp == dev->buf_end) dev->buf_rp = dev->buf; send -= cur; } wakeup(&dev->buf_wp); return error; } int drm_write_string(drm_device_t *dev, const char *s) { int left = (dev->buf_rp + DRM_BSZ - dev->buf_wp) % DRM_BSZ; int send = strlen(s); int count; DRM_DEBUG("%d left, %d to send (%p, %p)\n", left, send, dev->buf_rp, dev->buf_wp); if (left == 1 || dev->buf_wp != dev->buf_rp) { DRM_ERROR("Buffer not empty (%d left, wp = %p, rp = %p)\n", left, dev->buf_wp, dev->buf_rp); } while (send) { if (dev->buf_wp >= dev->buf_rp) { count = DRM_MIN(send, dev->buf_end - dev->buf_wp); if (count == left) --count; /* Leave a hole */ } else { count = DRM_MIN(send, dev->buf_rp - dev->buf_wp - 1); } strncpy(dev->buf_wp, s, count); dev->buf_wp += count; if (dev->buf_wp == dev->buf_end) dev->buf_wp = dev->buf; send -= count; } if (dev->buf_selecting) { dev->buf_selecting = 0; selwakeup(&dev->buf_sel); } DRM_DEBUG("dev->buf_sigio=%p\n", dev->buf_sigio); if (dev->buf_sigio) { DRM_DEBUG("dev->buf_sigio->sio_pgid=%d\n", dev->buf_sigio->sio_pgid); pgsigio(dev->buf_sigio, SIGIO, 0); } DRM_DEBUG("waking\n"); wakeup(&dev->buf_rp); return 0; } int drm_poll(dev_t kdev, int events, struct proc *p) { drm_device_t *dev = kdev->si_drv1; int s; int revents = 0; s = spldrm(); if (events & (POLLIN | POLLRDNORM)) { int left = (dev->buf_rp + DRM_BSZ - dev->buf_wp) % DRM_BSZ; if (left > 0) revents |= events & (POLLIN | POLLRDNORM); else selrecord(p, &dev->buf_sel); } splx(s); return revents; } '#n135'>135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217