1 /* drm_fops.h -- File operations for DRM -*- linux-c -*-
2 * Created: Mon Jan 4 08:58:31 1999 by faith@valinux.com
4 * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
5 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
8 * Permission is hereby granted, free of charge, to any person obtaining a
9 * copy of this software and associated documentation files (the "Software"),
10 * to deal in the Software without restriction, including without limitation
11 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
12 * and/or sell copies of the Software, and to permit persons to whom the
13 * Software is furnished to do so, subject to the following conditions:
15 * The above copyright notice and this permission notice (including the next
16 * paragraph) shall be included in all copies or substantial portions of the
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
20 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
22 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
23 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
24 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
25 * OTHER DEALINGS IN THE SOFTWARE.
28 * Rickard E. (Rik) Faith <faith@valinux.com>
29 * Daryll Strauss <daryll@valinux.com>
30 * Gareth Hughes <gareth@valinux.com>
35 #define __NO_VERSION__
36 #include "dev/drm/drmP.h"
39 #include <linux/poll.h>
40 #endif /* __linux__ */
43 #include <sys/signalvar.h>
46 drm_file_t *DRM(find_file_by_proc)(drm_device_t *dev, DRM_OS_STRUCTPROC *p)
48 #if __FreeBSD_version >= 500021
49 uid_t uid = p->td_proc->p_ucred->cr_svuid;
50 pid_t pid = p->td_proc->p_pid;
52 uid_t uid = p->p_cred->p_svuid;
57 TAILQ_FOREACH(priv, &dev->files, link)
58 if (priv->pid == pid && priv->uid == uid)
62 #endif /* __FreeBSD__ */
64 /* DRM(open) is called whenever a process opens /dev/drm. */
67 int DRM(open_helper)(struct inode *inode, struct file *filp, drm_device_t *dev)
69 kdev_t m = MINOR(inode->i_rdev);
70 #endif /* __linux__ */
72 int DRM(open_helper)(dev_t kdev, int flags, int fmt, DRM_OS_STRUCTPROC *p,
76 #endif /* __FreeBSD__ */
80 if (filp->f_flags & O_EXCL) return -EBUSY; /* No exclusive opens */
81 #endif /* __linux__ */
84 return EBUSY; /* No exclusive opens */
86 #endif /* __FreeBSD__ */
87 if (!DRM(cpu_valid)())
88 return DRM_OS_ERR(EINVAL);
90 DRM_DEBUG("pid = %d, minor = %d\n", DRM_OS_CURRENTPID, m);
93 priv = (drm_file_t *) DRM(alloc)(sizeof(*priv), DRM_MEM_FILES);
94 if(!priv) return DRM_OS_ERR(ENOMEM);
96 memset(priv, 0, sizeof(*priv));
97 filp->private_data = priv;
98 priv->uid = current->euid;
99 priv->pid = current->pid;
102 priv->ioctl_count = 0;
103 priv->authenticated = capable(CAP_SYS_ADMIN);
105 down(&dev->struct_sem);
106 if (!dev->file_last) {
109 dev->file_first = priv;
110 dev->file_last = priv;
113 priv->prev = dev->file_last;
114 dev->file_last->next = priv;
115 dev->file_last = priv;
117 up(&dev->struct_sem);
118 #endif /* __linux__ */
120 priv = (drm_file_t *) DRM(find_file_by_proc)(dev, p);
124 priv = (drm_file_t *) DRM(alloc)(sizeof(*priv), DRM_MEM_FILES);
125 bzero(priv, sizeof(*priv));
126 #if __FreeBSD_version >= 500000
127 priv->uid = p->td_proc->p_ucred->cr_svuid;
128 priv->pid = p->td_proc->p_pid;
130 priv->uid = p->p_cred->p_svuid;
131 priv->pid = p->p_pid;
137 priv->ioctl_count = 0;
138 priv->authenticated = !DRM_OS_CHECKSUSER;
139 lockmgr(&dev->dev_lock, LK_EXCLUSIVE, 0, p);
140 TAILQ_INSERT_TAIL(&dev->files, priv, link);
141 lockmgr(&dev->dev_lock, LK_RELEASE, 0, p);
145 #endif /* __FreeBSD__ */
153 struct pci_dev *pci_dev;
154 pci_dev = pci_find_class(PCI_CLASS_DISPLAY_VGA << 8, NULL);
155 if (pci_dev) dev->hose = pci_dev->sysdata;
157 struct pci_bus *b = pci_bus_b(pci_root_buses.next);
158 if (b) dev->hose = b->sysdata;
162 #endif /* __linux__ */
168 int DRM(flush)(struct file *filp)
170 drm_file_t *priv = filp->private_data;
171 drm_device_t *dev = priv->dev;
173 DRM_DEBUG("pid = %d, device = 0x%x, open_count = %d\n",
174 current->pid, dev->device, dev->open_count);
178 int DRM(fasync)(int fd, struct file *filp, int on)
180 drm_file_t *priv = filp->private_data;
181 drm_device_t *dev = priv->dev;
184 DRM_DEBUG("fd = %d, device = 0x%x\n", fd, dev->device);
185 retcode = fasync_helper(fd, filp, on, &dev->buf_async);
186 if (retcode < 0) return retcode;
189 #endif /* __linux__ */
191 /* The drm_read and drm_write_string code (especially that which manages
192 the circular buffer), is based on Alessandro Rubini's LINUX DEVICE
193 DRIVERS (Cambridge: O'Reilly, 1998), pages 111-113. */
196 ssize_t DRM(read)(struct file *filp, char *buf, size_t count, loff_t *off)
197 #endif /* __linux__ */
199 ssize_t DRM(read)(dev_t kdev, struct uio *uio, int ioflag)
200 #endif /* __FreeBSD__ */
209 #endif /* __FreeBSD__ */
211 DRM_DEBUG("%p, %p\n", dev->buf_rp, dev->buf_wp);
213 while (dev->buf_rp == dev->buf_wp) {
214 DRM_DEBUG(" sleeping\n");
216 if (filp->f_flags & O_NONBLOCK)
218 interruptible_sleep_on(&dev->buf_readers);
219 if (signal_pending(current)) {
220 DRM_DEBUG(" interrupted\n");
223 #endif /* __linux__ */
225 if (dev->flags & FASYNC)
227 error = tsleep(&dev->buf_rp, PZERO|PCATCH, "drmrd", 0);
229 DRM_DEBUG(" interrupted\n");
232 #endif /* __FreeBSD__ */
233 DRM_DEBUG(" awake\n");
236 left = (dev->buf_rp + DRM_BSZ - dev->buf_wp) % DRM_BSZ;
237 avail = DRM_BSZ - left;
239 send = DRM_MIN(avail, count);
240 #endif /* __linux__ */
242 send = DRM_MIN(avail, uio->uio_resid);
243 #endif /* __FreeBSD__ */
246 if (dev->buf_wp > dev->buf_rp) {
247 cur = DRM_MIN(send, dev->buf_wp - dev->buf_rp);
249 cur = DRM_MIN(send, dev->buf_end - dev->buf_rp);
252 if (copy_to_user(buf, dev->buf_rp, cur))
254 #endif /* __linux__ */
256 error = uiomove(dev->buf_rp, cur, uio);
259 #endif /* __FreeBSD__ */
261 if (dev->buf_rp == dev->buf_end) dev->buf_rp = dev->buf;
266 wake_up_interruptible(&dev->buf_writers);
267 return DRM_MIN(avail, count);
268 #endif /* __linux__ */
270 wakeup(&dev->buf_wp);
272 #endif /* __FreeBSD__ */
275 int DRM(write_string)(drm_device_t *dev, const char *s)
277 int left = (dev->buf_rp + DRM_BSZ - dev->buf_wp) % DRM_BSZ;
278 int send = strlen(s);
281 DRM_DEBUG("%d left, %d to send (%p, %p)\n",
282 left, send, dev->buf_rp, dev->buf_wp);
284 if (left == 1 || dev->buf_wp != dev->buf_rp) {
285 DRM_ERROR("Buffer not empty (%d left, wp = %p, rp = %p)\n",
292 if (dev->buf_wp >= dev->buf_rp) {
293 count = DRM_MIN(send, dev->buf_end - dev->buf_wp);
294 if (count == left) --count; /* Leave a hole */
296 count = DRM_MIN(send, dev->buf_rp - dev->buf_wp - 1);
298 strncpy(dev->buf_wp, s, count);
299 dev->buf_wp += count;
300 if (dev->buf_wp == dev->buf_end) dev->buf_wp = dev->buf;
305 if (dev->buf_async) kill_fasync(&dev->buf_async, SIGIO, POLL_IN);
306 DRM_DEBUG("waking\n");
307 wake_up_interruptible(&dev->buf_readers);
308 #endif /* __linux__ */
310 if (dev->buf_selecting) {
311 dev->buf_selecting = 0;
312 selwakeup(&dev->buf_sel);
315 DRM_DEBUG("dev->buf_sigio=%p\n", dev->buf_sigio);
316 if (dev->buf_sigio) {
317 DRM_DEBUG("dev->buf_sigio->sio_pgid=%d\n", dev->buf_sigio->sio_pgid);
318 pgsigio(&dev->buf_sigio, SIGIO, 0);
320 DRM_DEBUG("waking\n");
321 wakeup(&dev->buf_rp);
322 #endif /* __FreeBSD__ */
328 unsigned int DRM(poll)(struct file *filp, struct poll_table_struct *wait)
332 poll_wait(filp, &dev->buf_readers, wait);
333 if (dev->buf_wp != dev->buf_rp) return POLLIN | POLLRDNORM;
336 #endif /* __linux__ */
338 int DRM(poll)(dev_t kdev, int events, DRM_OS_STRUCTPROC *p)
340 drm_device_t *dev = kdev->si_drv1;
345 if (events & (POLLIN | POLLRDNORM)) {
346 int left = (dev->buf_rp + DRM_BSZ - dev->buf_wp) % DRM_BSZ;
348 revents |= events & (POLLIN | POLLRDNORM);
350 selrecord(p, &dev->buf_sel);
357 int DRM(write)(dev_t kdev, struct uio *uio, int ioflag)
359 DRM_DEBUG("pid = %d, device = %p, open_count = %d\n",
360 curproc->p_pid, ((drm_device_t *)kdev->si_drv1)->device, ((drm_device_t *)kdev->si_drv1)->open_count);
363 #endif /* __FreeBSD__ */