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,
44 static int drm_setup(drm_device_t * dev)
51 if (dev->driver->firstopen) {
52 ret = dev->driver->firstopen(dev);
57 dev->magicfree.next = NULL;
59 /* prebuild the SAREA */
61 i = drm_addmap(dev, 0, SAREA_MAX, _DRM_SHM, _DRM_CONTAINS_LOCK, &map);
65 atomic_set(&dev->ioctl_count, 0);
66 atomic_set(&dev->vma_count, 0);
68 atomic_set(&dev->buf_alloc, 0);
70 if (drm_core_check_feature(dev, DRIVER_HAVE_DMA)) {
71 i = drm_dma_setup(dev);
76 for (i = 0; i < ARRAY_SIZE(dev->counts); i++)
77 atomic_set(&dev->counts[i], 0);
79 drm_ht_create(&dev->magiclist, DRM_MAGIC_HASH_ORDER);
80 INIT_LIST_HEAD(&dev->magicfree);
82 dev->ctxlist = drm_alloc(sizeof(*dev->ctxlist), DRM_MEM_CTXLIST);
83 if (dev->ctxlist == NULL)
85 memset(dev->ctxlist, 0, sizeof(*dev->ctxlist));
86 INIT_LIST_HEAD(&dev->ctxlist->head);
89 dev->sigdata.lock = NULL;
90 init_waitqueue_head(&dev->lock.lock_queue);
92 dev->queue_reserved = 0;
94 dev->queuelist = NULL;
96 dev->context_flag = 0;
97 dev->interrupt_flag = 0;
99 dev->last_context = 0;
100 dev->last_switch = 0;
101 dev->last_checked = 0;
102 init_waitqueue_head(&dev->context_wait);
108 dev->buf_async = NULL;
109 init_waitqueue_head(&dev->buf_readers);
110 init_waitqueue_head(&dev->buf_writers);
115 * The kernel's context could be created here, but is now created
116 * in drm_dma_enqueue. This is more resource-efficient for
117 * hardware that does not do DMA, but may mean that
118 * drm_select_queue fails between the time the interrupt is
119 * initialized and the time the queues are initialized.
128 * \param inode device inode
129 * \param filp file pointer.
130 * \return zero on success or a negative number on failure.
132 * Searches the DRM device with the same minor number, calls open_helper(), and
133 * increments the device open count. If the open count was previous at zero,
134 * i.e., it's the first that the device is open, then calls setup().
136 int drm_open(struct inode *inode, struct file *filp)
138 drm_device_t *dev = NULL;
139 int minor = iminor(inode);
142 if (!((minor >= 0) && (minor < drm_cards_limit)))
145 if (!drm_heads[minor])
148 if (!(dev = drm_heads[minor]->dev))
151 retcode = drm_open_helper(inode, filp, dev);
153 atomic_inc(&dev->counts[_DRM_STAT_OPENS]);
154 spin_lock(&dev->count_lock);
155 if (!dev->open_count++) {
156 spin_unlock(&dev->count_lock);
157 return drm_setup(dev);
159 spin_unlock(&dev->count_lock);
164 EXPORT_SYMBOL(drm_open);
167 * File \c open operation.
169 * \param inode device inode.
170 * \param filp file pointer.
172 * Puts the dev->fops corresponding to the device minor number into
173 * \p filp, call the \c open method, and restore the file operations.
175 int drm_stub_open(struct inode *inode, struct file *filp)
177 drm_device_t *dev = NULL;
178 int minor = iminor(inode);
180 const struct file_operations *old_fops;
184 if (!((minor >= 0) && (minor < drm_cards_limit)))
187 if (!drm_heads[minor])
190 if (!(dev = drm_heads[minor]->dev))
193 old_fops = filp->f_op;
194 filp->f_op = fops_get(&dev->driver->fops);
195 if (filp->f_op->open && (err = filp->f_op->open(inode, filp))) {
196 fops_put(filp->f_op);
197 filp->f_op = fops_get(old_fops);
205 * Check whether DRI will run on this CPU.
207 * \return non-zero if the DRI will run on this CPU, or zero otherwise.
209 static int drm_cpu_valid(void)
211 #if defined(__i386__)
212 if (boot_cpu_data.x86 == 3)
213 return 0; /* No cmpxchg on a 386 */
215 #if defined(__sparc__) && !defined(__sparc_v9__)
216 return 0; /* No cmpxchg before v9 sparc. */
222 * Called whenever a process opens /dev/drm.
224 * \param inode device inode.
225 * \param filp file pointer.
227 * \return zero on success or a negative number on failure.
229 * Creates and initializes a drm_file structure for the file private data in \p
230 * filp and add it into the double linked list in \p dev.
232 static int drm_open_helper(struct inode *inode, struct file *filp,
235 int minor = iminor(inode);
240 if (filp->f_flags & O_EXCL)
241 return -EBUSY; /* No exclusive opens */
242 if (!drm_cpu_valid())
245 DRM_DEBUG("pid = %d, minor = %d\n", current->pid, minor);
247 priv = drm_alloc(sizeof(*priv), DRM_MEM_FILES);
251 memset(priv, 0, sizeof(*priv));
252 filp->private_data = priv;
253 priv->uid = current->euid;
254 priv->pid = current->pid;
256 priv->head = drm_heads[minor];
257 priv->ioctl_count = 0;
258 /* for compatibility root is always authenticated */
259 priv->authenticated = capable(CAP_SYS_ADMIN);
260 priv->lock_count = 0;
262 INIT_LIST_HEAD(&priv->user_objects);
263 INIT_LIST_HEAD(&priv->refd_objects);
265 for (i=0; i<_DRM_NO_REF_TYPES; ++i) {
266 ret = drm_ht_create(&priv->refd_object_hash[i], DRM_FILE_HASH_ORDER);
273 drm_ht_remove(&priv->refd_object_hash[j]);
278 if (dev->driver->open) {
279 ret = dev->driver->open(dev, priv);
284 mutex_lock(&dev->struct_mutex);
285 if (!dev->file_last) {
288 dev->file_first = priv;
289 dev->file_last = priv;
290 /* first opener automatically becomes master */
294 priv->prev = dev->file_last;
295 dev->file_last->next = priv;
296 dev->file_last = priv;
298 mutex_unlock(&dev->struct_mutex);
305 struct pci_dev *pci_dev;
306 pci_dev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, NULL);
308 dev->hose = pci_dev->sysdata;
309 pci_dev_put(pci_dev);
312 struct pci_bus *b = pci_bus_b(pci_root_buses.next);
314 dev->hose = b->sysdata;
321 drm_free(priv, sizeof(*priv), DRM_MEM_FILES);
322 filp->private_data = NULL;
327 int drm_fasync(int fd, struct file *filp, int on)
329 drm_file_t *priv = filp->private_data;
330 drm_device_t *dev = priv->head->dev;
333 DRM_DEBUG("fd = %d, device = 0x%lx\n", fd,
334 (long)old_encode_dev(priv->head->device));
335 retcode = fasync_helper(fd, filp, on, &dev->buf_async);
340 EXPORT_SYMBOL(drm_fasync);
342 static void drm_object_release(struct file *filp) {
344 drm_file_t *priv = filp->private_data;
345 struct list_head *head;
346 drm_user_object_t *user_object;
347 drm_ref_object_t *ref_object;
351 * Free leftover ref objects created by me. Note that we cannot use
352 * list_for_each() here, as the struct_mutex may be temporarily released
353 * by the remove_() functions, and thus the lists may be altered.
354 * Also, a drm_remove_ref_object() will not remove it
355 * from the list unless its refcount is 1.
358 head = &priv->refd_objects;
359 while (head->next != head) {
360 ref_object = list_entry(head->next, drm_ref_object_t, list);
361 drm_remove_ref_object(priv, ref_object);
362 head = &priv->refd_objects;
366 * Free leftover user objects created by me.
369 head = &priv->user_objects;
370 while (head->next != head) {
371 user_object = list_entry(head->next, drm_user_object_t, list);
372 drm_remove_user_object(priv, user_object);
373 head = &priv->user_objects;
379 for(i=0; i<_DRM_NO_REF_TYPES; ++i) {
380 drm_ht_remove(&priv->refd_object_hash[i]);
392 * \param inode device inode
393 * \param filp file pointer.
394 * \return zero on success or a negative number on failure.
396 * If the hardware lock is held then free it, and take it again for the kernel
397 * context since it's necessary to reclaim buffers. Unlink the file private
398 * data from its list and free it. Decreases the open count and if it reaches
399 * zero calls drm_lastclose().
401 int drm_release(struct inode *inode, struct file *filp)
403 drm_file_t *priv = filp->private_data;
408 dev = priv->head->dev;
410 DRM_DEBUG("open_count = %d\n", dev->open_count);
412 if (dev->driver->preclose)
413 dev->driver->preclose(dev, filp);
415 /* ========================================================
416 * Begin inline drm_release
419 DRM_DEBUG("pid = %d, device = 0x%lx, open_count = %d\n",
420 current->pid, (long)old_encode_dev(priv->head->device),
423 if (dev->driver->reclaim_buffers_locked) {
424 unsigned long _end = jiffies + DRM_HZ*3;
427 retcode = drm_kernel_take_hw_lock(filp);
428 } while(retcode && !time_after_eq(jiffies,_end));
431 dev->driver->reclaim_buffers_locked(dev, filp);
433 drm_lock_free(dev, &dev->lock.hw_lock->lock,
434 _DRM_LOCKING_CONTEXT(dev->lock.hw_lock->lock));
438 * FIXME: This is not a good solution. We should perhaps associate the
439 * DRM lock with a process context, and check whether the current process
440 * holds the lock. Then we can run reclaim buffers locked anyway.
443 DRM_ERROR("Reclaim buffers locked deadlock.\n");
444 DRM_ERROR("This is probably a single thread having multiple\n");
445 DRM_ERROR("DRM file descriptors open either dying or "
446 "closing file descriptors\n");
447 DRM_ERROR("while having the lock. I will not reclaim buffers.\n");
448 DRM_ERROR("Locking context is 0x%08x\n",
449 _DRM_LOCKING_CONTEXT(dev->lock.hw_lock->lock));
451 } else if (drm_i_have_hw_lock(filp)) {
452 DRM_DEBUG("File %p released, freeing lock for context %d\n",
453 filp, _DRM_LOCKING_CONTEXT(dev->lock.hw_lock->lock));
455 drm_lock_free(dev, &dev->lock.hw_lock->lock,
456 _DRM_LOCKING_CONTEXT(dev->lock.hw_lock->lock));
460 if (drm_core_check_feature(dev, DRIVER_HAVE_DMA) &&
461 !dev->driver->reclaim_buffers_locked) {
462 dev->driver->reclaim_buffers(dev, filp);
465 drm_fasync(-1, filp, 0);
467 mutex_lock(&dev->ctxlist_mutex);
468 if (dev->ctxlist && (!list_empty(&dev->ctxlist->head))) {
469 drm_ctx_list_t *pos, *n;
471 list_for_each_entry_safe(pos, n, &dev->ctxlist->head, head) {
472 if (pos->tag == priv &&
473 pos->handle != DRM_KERNEL_CONTEXT) {
474 if (dev->driver->context_dtor)
475 dev->driver->context_dtor(dev,
478 drm_ctxbitmap_free(dev, pos->handle);
480 list_del(&pos->head);
481 drm_free(pos, sizeof(*pos), DRM_MEM_CTXLIST);
486 mutex_unlock(&dev->ctxlist_mutex);
488 mutex_lock(&dev->struct_mutex);
489 drm_object_release(filp);
490 if (priv->remove_auth_on_close == 1) {
491 drm_file_t *temp = dev->file_first;
493 temp->authenticated = 0;
498 priv->prev->next = priv->next;
500 dev->file_first = priv->next;
503 priv->next->prev = priv->prev;
505 dev->file_last = priv->prev;
507 mutex_unlock(&dev->struct_mutex);
509 if (dev->driver->postclose)
510 dev->driver->postclose(dev, priv);
511 drm_free(priv, sizeof(*priv), DRM_MEM_FILES);
513 /* ========================================================
514 * End inline drm_release
517 atomic_inc(&dev->counts[_DRM_STAT_CLOSES]);
518 spin_lock(&dev->count_lock);
519 if (!--dev->open_count) {
520 if (atomic_read(&dev->ioctl_count) || dev->blocked) {
521 DRM_ERROR("Device busy: %d %d\n",
522 atomic_read(&dev->ioctl_count), dev->blocked);
523 spin_unlock(&dev->count_lock);
527 spin_unlock(&dev->count_lock);
529 return drm_lastclose(dev);
531 spin_unlock(&dev->count_lock);
537 EXPORT_SYMBOL(drm_release);
540 /* This is to deal with older X servers that believe 0 means data is
541 * available which is not the correct return for a poll function.
542 * This cannot be fixed until the Xserver is fixed. Xserver will need
543 * to set a newer interface version to avoid breaking older Xservers.
544 * Without fixing the Xserver you get: "WaitForSomething(): select: errno=22"
545 * http://freedesktop.org/bugzilla/show_bug.cgi?id=1505 if you try
546 * to return the correct response.
548 unsigned int drm_poll(struct file *filp, struct poll_table_struct *wait)
550 /* return (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM); */
553 EXPORT_SYMBOL(drm_poll);