/* 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; }