diff options
Diffstat (limited to 'bsd/drm_fops.h')
| -rw-r--r-- | bsd/drm_fops.h | 223 |
1 files changed, 223 insertions, 0 deletions
diff --git a/bsd/drm_fops.h b/bsd/drm_fops.h new file mode 100644 index 00000000..53af39cd --- /dev/null +++ b/bsd/drm_fops.h @@ -0,0 +1,223 @@ +/* drm_fops.h -- File operations for DRM -*- linux-c -*- + * Created: Mon Jan 4 08:58:31 1999 by faith@valinux.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 + * VA LINUX SYSTEMS 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 <faith@valinux.com> + * Daryll Strauss <daryll@valinux.com> + * Gareth Hughes <gareth@valinux.com> + */ + +#define __NO_VERSION__ +#include "drmP.h" + + +#include <sys/signalvar.h> +#include <sys/poll.h> + +drm_file_t *DRM(find_file_by_proc)(drm_device_t *dev, DRM_OS_STRUCTPROC *p) +{ +#if __FreeBSD_version >= 500021 + uid_t uid = p->td_proc->p_ucred->cr_svuid; + pid_t pid = p->td_proc->p_pid; +#else + uid_t uid = p->p_cred->p_svuid; + pid_t pid = p->p_pid; +#endif + 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, DRM_OS_STRUCTPROC *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; + if (!DRM(cpu_valid)()) + DRM_OS_RETURN(EINVAL); + + DRM_DEBUG("pid = %d, minor = %d\n", DRM_OS_CURRENTPID, m); + + /* FIXME: linux mallocs and bzeros here */ + priv = (drm_file_t *) DRM(find_file_by_proc)(dev, p); + if (priv) { + priv->refs++; + } else { + priv = (drm_file_t *) DRM(alloc)(sizeof(*priv), DRM_MEM_FILES); + bzero(priv, sizeof(*priv)); +#if __FreeBSD_version >= 500000 + priv->uid = p->td_proc->p_ucred->cr_svuid; + priv->pid = p->td_proc->p_pid; +#else + priv->uid = p->p_cred->p_svuid; + priv->pid = p->p_pid; +#endif + + priv->refs = 1; + priv->minor = m; + priv->devXX = dev; + priv->ioctl_count = 0; + priv->authenticated = !DRM_OS_CHECKSUSER; + 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; +} + + +/* 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_OS_DEVICE; + 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, DRM_OS_STRUCTPROC *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; +} + +int DRM(write)(dev_t kdev, struct uio *uio, int ioflag) +{ + DRM_DEBUG("pid = %d, device = %p, open_count = %d\n", + curproc->p_pid, ((drm_device_t *)kdev->si_drv1)->device, ((drm_device_t *)kdev->si_drv1)->open_count); + return 0; +} |