3 * File operations for DRM
5 * \author Rickard E. (Rik) Faith <faith@valinux.com>
6 * \author Daryll Strauss <daryll@valinux.com>
7 * \author Gareth Hughes <gareth@valinux.com>
11 * Created: Mon Jan 4 08:58:31 1999 by faith@valinux.com
13 * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
14 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
15 * All Rights Reserved.
17 * Permission is hereby granted, free of charge, to any person obtaining a
18 * copy of this software and associated documentation files (the "Software"),
19 * to deal in the Software without restriction, including without limitation
20 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
21 * and/or sell copies of the Software, and to permit persons to whom the
22 * Software is furnished to do so, subject to the following conditions:
24 * The above copyright notice and this permission notice (including the next
25 * paragraph) shall be included in all copies or substantial portions of the
28 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
29 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
30 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
31 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
32 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
33 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
34 * OTHER DEALINGS IN THE SOFTWARE.
38 #include "drm_sarea.h"
39 #include <linux/poll.h>
41 static int drm_open_helper(struct inode *inode, struct file *filp,
42 struct drm_device * dev);
44 static int drm_setup(struct drm_device * dev)
49 if (dev->driver->firstopen) {
50 ret = dev->driver->firstopen(dev);
55 atomic_set(&dev->ioctl_count, 0);
56 atomic_set(&dev->vma_count, 0);
58 if (drm_core_check_feature(dev, DRIVER_HAVE_DMA) && !drm_core_check_feature(dev, DRIVER_MODESET)) {
60 atomic_set(&dev->buf_alloc, 0);
62 i = drm_dma_setup(dev);
67 for (i = 0; i < ARRAY_SIZE(dev->counts); i++)
68 atomic_set(&dev->counts[i], 0);
70 dev->sigdata.lock = NULL;
73 dev->queue_reserved = 0;
75 dev->queuelist = NULL;
76 dev->context_flag = 0;
77 dev->interrupt_flag = 0;
79 dev->last_context = 0;
81 dev->last_checked = 0;
82 init_waitqueue_head(&dev->context_wait);
88 dev->buf_async = NULL;
89 init_waitqueue_head(&dev->buf_readers);
90 init_waitqueue_head(&dev->buf_writers);
95 * The kernel's context could be created here, but is now created
96 * in drm_dma_enqueue. This is more resource-efficient for
97 * hardware that does not do DMA, but may mean that
98 * drm_select_queue fails between the time the interrupt is
99 * initialized and the time the queues are initialized.
108 * \param inode device inode
109 * \param filp file pointer.
110 * \return zero on success or a negative number on failure.
112 * Searches the DRM device with the same minor number, calls open_helper(), and
113 * increments the device open count. If the open count was previous at zero,
114 * i.e., it's the first that the device is open, then calls setup().
116 int drm_open(struct inode *inode, struct file *filp)
118 struct drm_device *dev = NULL;
119 int minor_id = iminor(inode);
120 struct drm_minor *minor;
123 minor = idr_find(&drm_minors_idr, minor_id);
127 if (!(dev = minor->dev))
130 retcode = drm_open_helper(inode, filp, dev);
132 atomic_inc(&dev->counts[_DRM_STAT_OPENS]);
133 spin_lock(&dev->count_lock);
134 if (!dev->open_count++) {
135 spin_unlock(&dev->count_lock);
136 retcode = drm_setup(dev);
139 spin_unlock(&dev->count_lock);
143 mutex_lock(&dev->struct_mutex);
144 BUG_ON((dev->dev_mapping != NULL) &&
145 (dev->dev_mapping != inode->i_mapping));
146 if (dev->dev_mapping == NULL)
147 dev->dev_mapping = inode->i_mapping;
148 mutex_unlock(&dev->struct_mutex);
152 EXPORT_SYMBOL(drm_open);
155 * File \c open operation.
157 * \param inode device inode.
158 * \param filp file pointer.
160 * Puts the dev->fops corresponding to the device minor number into
161 * \p filp, call the \c open method, and restore the file operations.
163 int drm_stub_open(struct inode *inode, struct file *filp)
165 struct drm_device *dev = NULL;
166 struct drm_minor *minor;
167 int minor_id = iminor(inode);
169 const struct file_operations *old_fops;
173 minor = idr_find(&drm_minors_idr, minor_id);
177 if (!(dev = minor->dev))
180 old_fops = filp->f_op;
181 filp->f_op = fops_get(&dev->driver->fops);
182 if (filp->f_op->open && (err = filp->f_op->open(inode, filp))) {
183 fops_put(filp->f_op);
184 filp->f_op = fops_get(old_fops);
192 * Check whether DRI will run on this CPU.
194 * \return non-zero if the DRI will run on this CPU, or zero otherwise.
196 static int drm_cpu_valid(void)
198 #if defined(__i386__)
199 if (boot_cpu_data.x86 == 3)
200 return 0; /* No cmpxchg on a 386 */
202 #if defined(__sparc__) && !defined(__sparc_v9__)
203 return 0; /* No cmpxchg before v9 sparc. */
209 * Called whenever a process opens /dev/drm.
211 * \param inode device inode.
212 * \param filp file pointer.
214 * \return zero on success or a negative number on failure.
216 * Creates and initializes a drm_file structure for the file private data in \p
217 * filp and add it into the double linked list in \p dev.
219 static int drm_open_helper(struct inode *inode, struct file *filp,
220 struct drm_device * dev)
222 int minor_id = iminor(inode);
223 struct drm_file *priv;
226 if (filp->f_flags & O_EXCL)
227 return -EBUSY; /* No exclusive opens */
228 if (!drm_cpu_valid())
231 DRM_DEBUG("pid = %d, minor = %d\n", current->pid, minor_id);
233 priv = drm_alloc(sizeof(*priv), DRM_MEM_FILES);
237 memset(priv, 0, sizeof(*priv));
238 filp->private_data = priv;
240 priv->uid = current->euid;
241 priv->pid = current->pid;
242 priv->minor = idr_find(&drm_minors_idr, minor_id);
243 priv->ioctl_count = 0;
244 /* for compatibility root is always authenticated */
245 priv->authenticated = capable(CAP_SYS_ADMIN);
246 priv->lock_count = 0;
248 INIT_LIST_HEAD(&priv->lhead);
249 INIT_LIST_HEAD(&priv->fbs);
251 if (dev->driver->driver_features & DRIVER_GEM)
252 drm_gem_open(dev, priv);
254 if (dev->driver->open) {
255 ret = dev->driver->open(dev, priv);
261 /* if there is no current master make this fd it */
262 mutex_lock(&dev->struct_mutex);
263 if (!priv->minor->master) {
264 /* create a new master */
265 priv->minor->master = drm_master_create(priv->minor);
266 if (!priv->minor->master) {
272 /* take another reference for the copy in the local file priv */
273 priv->master = drm_master_get(priv->minor->master);
275 priv->authenticated = 1;
277 mutex_unlock(&dev->struct_mutex);
278 if (dev->driver->master_create) {
279 ret = dev->driver->master_create(dev, priv->master);
281 mutex_lock(&dev->struct_mutex);
282 /* drop both references if this fails */
283 drm_master_put(&priv->minor->master);
284 drm_master_put(&priv->master);
285 mutex_unlock(&dev->struct_mutex);
290 /* get a reference to the master */
291 priv->master = drm_master_get(priv->minor->master);
292 mutex_unlock(&dev->struct_mutex);
295 mutex_lock(&dev->struct_mutex);
296 list_add(&priv->lhead, &dev->filelist);
297 mutex_unlock(&dev->struct_mutex);
304 struct pci_dev *pci_dev;
305 pci_dev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, NULL);
307 dev->hose = pci_dev->sysdata;
308 pci_dev_put(pci_dev);
311 struct pci_bus *b = pci_bus_b(pci_root_buses.next);
313 dev->hose = b->sysdata;
320 drm_free(priv, sizeof(*priv), DRM_MEM_FILES);
321 filp->private_data = NULL;
326 int drm_fasync(int fd, struct file *filp, int on)
328 struct drm_file *priv = filp->private_data;
329 struct drm_device *dev = priv->minor->dev;
332 DRM_DEBUG("fd = %d, device = 0x%lx\n", fd,
333 (long)old_encode_dev(priv->minor->device));
334 retcode = fasync_helper(fd, filp, on, &dev->buf_async);
339 EXPORT_SYMBOL(drm_fasync);
344 * \param inode device inode
345 * \param file_priv DRM file private.
346 * \return zero on success or a negative number on failure.
348 * If the hardware lock is held then free it, and take it again for the kernel
349 * context since it's necessary to reclaim buffers. Unlink the file private
350 * data from its list and free it. Decreases the open count and if it reaches
351 * zero calls drm_lastclose().
353 int drm_release(struct inode *inode, struct file *filp)
355 struct drm_file *file_priv = filp->private_data;
356 struct drm_device *dev = file_priv->minor->dev;
361 DRM_DEBUG("open_count = %d\n", dev->open_count);
363 if (dev->driver->preclose)
364 dev->driver->preclose(dev, file_priv);
366 /* ========================================================
367 * Begin inline drm_release
370 DRM_DEBUG("pid = %d, device = 0x%lx, open_count = %d\n",
371 current->pid, (long)old_encode_dev(file_priv->minor->device),
374 /* if the master has gone away we can't do anything with the lock */
375 if (file_priv->minor->master) {
376 if (dev->driver->reclaim_buffers_locked && file_priv->master->lock.hw_lock) {
377 if (drm_i_have_hw_lock(dev, file_priv)) {
378 dev->driver->reclaim_buffers_locked(dev, file_priv);
380 unsigned long _end=jiffies + 3*DRM_HZ;
383 drm_idlelock_take(&file_priv->master->lock);
390 spin_lock_bh(&file_priv->master->lock.spinlock);
391 locked = file_priv->master->lock.idle_has_lock;
392 spin_unlock_bh(&file_priv->master->lock.spinlock);
396 } while (!time_after_eq(jiffies, _end));
399 DRM_ERROR("reclaim_buffers_locked() deadlock. Please rework this\n"
400 "\tdriver to use reclaim_buffers_idlelocked() instead.\n"
401 "\tI will go on reclaiming the buffers anyway.\n");
404 dev->driver->reclaim_buffers_locked(dev, file_priv);
405 drm_idlelock_release(&file_priv->master->lock);
409 if (dev->driver->reclaim_buffers_idlelocked && file_priv->master->lock.hw_lock) {
411 drm_idlelock_take(&file_priv->master->lock);
412 dev->driver->reclaim_buffers_idlelocked(dev, file_priv);
413 drm_idlelock_release(&file_priv->master->lock);
418 if (drm_i_have_hw_lock(dev, file_priv)) {
419 DRM_DEBUG("File %p released, freeing lock for context %d\n",
420 filp, _DRM_LOCKING_CONTEXT(file_priv->master->lock.hw_lock->lock));
422 drm_lock_free(&file_priv->master->lock,
423 _DRM_LOCKING_CONTEXT(file_priv->master->lock.hw_lock->lock));
427 if (drm_core_check_feature(dev, DRIVER_HAVE_DMA) &&
428 !dev->driver->reclaim_buffers_locked) {
429 dev->driver->reclaim_buffers(dev, file_priv);
433 if (dev->driver->driver_features & DRIVER_GEM)
434 drm_gem_release(dev, file_priv);
436 drm_fasync(-1, filp, 0);
438 mutex_lock(&dev->ctxlist_mutex);
440 if (!list_empty(&dev->ctxlist)) {
441 struct drm_ctx_list *pos, *n;
443 list_for_each_entry_safe(pos, n, &dev->ctxlist, head) {
444 if (pos->tag == file_priv &&
445 pos->handle != DRM_KERNEL_CONTEXT) {
446 if (dev->driver->context_dtor)
447 dev->driver->context_dtor(dev,
450 drm_ctxbitmap_free(dev, pos->handle);
452 list_del(&pos->head);
453 drm_free(pos, sizeof(*pos), DRM_MEM_CTXLIST);
458 mutex_unlock(&dev->ctxlist_mutex);
460 if (drm_core_check_feature(dev, DRIVER_MODESET))
461 drm_fb_release(filp);
463 mutex_lock(&dev->struct_mutex);
465 if (file_priv->is_master) {
466 struct drm_file *temp;
467 list_for_each_entry(temp, &dev->filelist, lhead) {
468 if ((temp->master == file_priv->master) &&
470 temp->authenticated = 0;
473 if (file_priv->minor->master == file_priv->master) {
474 /* drop the reference held my the minor */
475 drm_master_put(&file_priv->minor->master);
479 /* drop the reference held my the file priv */
480 drm_master_put(&file_priv->master);
481 file_priv->is_master = 0;
483 list_del(&file_priv->lhead);
484 mutex_unlock(&dev->struct_mutex);
486 if (dev->driver->postclose)
487 dev->driver->postclose(dev, file_priv);
488 drm_free(file_priv, sizeof(*file_priv), DRM_MEM_FILES);
490 /* ========================================================
491 * End inline drm_release
494 atomic_inc(&dev->counts[_DRM_STAT_CLOSES]);
495 spin_lock(&dev->count_lock);
496 if (!--dev->open_count) {
497 if (atomic_read(&dev->ioctl_count)) {
498 DRM_ERROR("Device busy: %d\n",
499 atomic_read(&dev->ioctl_count));
500 spin_unlock(&dev->count_lock);
504 spin_unlock(&dev->count_lock);
506 return drm_lastclose(dev);
508 spin_unlock(&dev->count_lock);
514 EXPORT_SYMBOL(drm_release);
517 /* This is to deal with older X servers that believe 0 means data is
518 * available which is not the correct return for a poll function.
519 * This cannot be fixed until the Xserver is fixed. Xserver will need
520 * to set a newer interface version to avoid breaking older Xservers.
521 * Without fixing the Xserver you get: "WaitForSomething(): select: errno=22"
522 * http://freedesktop.org/bugzilla/show_bug.cgi?id=1505 if you try
523 * to return the correct response.
525 unsigned int drm_poll(struct file *filp, struct poll_table_struct *wait)
527 /* return (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM); */
530 EXPORT_SYMBOL(drm_poll);