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>
40 #include <linux/smp_lock.h>
42 static int drm_open_helper(struct inode
*inode
, struct file
*filp
,
43 struct drm_device
* dev
);
45 static int drm_setup(struct drm_device
* dev
)
50 if (dev
->driver
->firstopen
) {
51 ret
= dev
->driver
->firstopen(dev
);
56 atomic_set(&dev
->ioctl_count
, 0);
57 atomic_set(&dev
->vma_count
, 0);
59 atomic_set(&dev
->buf_alloc
, 0);
61 if (drm_core_check_feature(dev
, DRIVER_HAVE_DMA
)) {
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 return drm_setup(dev
);
138 spin_unlock(&dev
->count_lock
);
143 EXPORT_SYMBOL(drm_open
);
146 * File \c open operation.
148 * \param inode device inode.
149 * \param filp file pointer.
151 * Puts the dev->fops corresponding to the device minor number into
152 * \p filp, call the \c open method, and restore the file operations.
154 int drm_stub_open(struct inode
*inode
, struct file
*filp
)
156 struct drm_device
*dev
= NULL
;
157 struct drm_minor
*minor
;
158 int minor_id
= iminor(inode
);
160 const struct file_operations
*old_fops
;
164 /* BKL pushdown: note that nothing else serializes idr_find() */
166 minor
= idr_find(&drm_minors_idr
, minor_id
);
170 if (!(dev
= minor
->dev
))
173 old_fops
= filp
->f_op
;
174 filp
->f_op
= fops_get(&dev
->driver
->fops
);
175 if (filp
->f_op
->open
&& (err
= filp
->f_op
->open(inode
, filp
))) {
176 fops_put(filp
->f_op
);
177 filp
->f_op
= fops_get(old_fops
);
187 * Check whether DRI will run on this CPU.
189 * \return non-zero if the DRI will run on this CPU, or zero otherwise.
191 static int drm_cpu_valid(void)
193 #if defined(__i386__)
194 if (boot_cpu_data
.x86
== 3)
195 return 0; /* No cmpxchg on a 386 */
197 #if defined(__sparc__) && !defined(__sparc_v9__)
198 return 0; /* No cmpxchg before v9 sparc. */
204 * Called whenever a process opens /dev/drm.
206 * \param inode device inode.
207 * \param filp file pointer.
209 * \return zero on success or a negative number on failure.
211 * Creates and initializes a drm_file structure for the file private data in \p
212 * filp and add it into the double linked list in \p dev.
214 static int drm_open_helper(struct inode
*inode
, struct file
*filp
,
215 struct drm_device
* dev
)
217 int minor_id
= iminor(inode
);
218 struct drm_file
*priv
;
221 if (filp
->f_flags
& O_EXCL
)
222 return -EBUSY
; /* No exclusive opens */
223 if (!drm_cpu_valid())
226 DRM_DEBUG("pid = %d, minor = %d\n", task_pid_nr(current
), minor_id
);
228 priv
= drm_alloc(sizeof(*priv
), DRM_MEM_FILES
);
232 memset(priv
, 0, sizeof(*priv
));
233 filp
->private_data
= priv
;
235 priv
->uid
= current_euid();
236 priv
->pid
= task_pid_nr(current
);
237 priv
->minor
= idr_find(&drm_minors_idr
, minor_id
);
238 priv
->ioctl_count
= 0;
239 /* for compatibility root is always authenticated */
240 priv
->authenticated
= capable(CAP_SYS_ADMIN
);
241 priv
->lock_count
= 0;
243 INIT_LIST_HEAD(&priv
->lhead
);
245 if (dev
->driver
->driver_features
& DRIVER_GEM
)
246 drm_gem_open(dev
, priv
);
248 if (dev
->driver
->open
) {
249 ret
= dev
->driver
->open(dev
, priv
);
255 /* if there is no current master make this fd it */
256 mutex_lock(&dev
->struct_mutex
);
257 if (!priv
->minor
->master
) {
258 /* create a new master */
259 priv
->minor
->master
= drm_master_create(priv
->minor
);
260 if (!priv
->minor
->master
) {
266 /* take another reference for the copy in the local file priv */
267 priv
->master
= drm_master_get(priv
->minor
->master
);
269 priv
->authenticated
= 1;
271 mutex_unlock(&dev
->struct_mutex
);
272 if (dev
->driver
->master_create
) {
273 ret
= dev
->driver
->master_create(dev
, priv
->master
);
275 mutex_lock(&dev
->struct_mutex
);
276 /* drop both references if this fails */
277 drm_master_put(&priv
->minor
->master
);
278 drm_master_put(&priv
->master
);
279 mutex_unlock(&dev
->struct_mutex
);
284 /* get a reference to the master */
285 priv
->master
= drm_master_get(priv
->minor
->master
);
286 mutex_unlock(&dev
->struct_mutex
);
289 mutex_lock(&dev
->struct_mutex
);
290 list_add(&priv
->lhead
, &dev
->filelist
);
291 mutex_unlock(&dev
->struct_mutex
);
298 struct pci_dev
*pci_dev
;
299 pci_dev
= pci_get_class(PCI_CLASS_DISPLAY_VGA
<< 8, NULL
);
301 dev
->hose
= pci_dev
->sysdata
;
302 pci_dev_put(pci_dev
);
305 struct pci_bus
*b
= pci_bus_b(pci_root_buses
.next
);
307 dev
->hose
= b
->sysdata
;
314 drm_free(priv
, sizeof(*priv
), DRM_MEM_FILES
);
315 filp
->private_data
= NULL
;
320 int drm_fasync(int fd
, struct file
*filp
, int on
)
322 struct drm_file
*priv
= filp
->private_data
;
323 struct drm_device
*dev
= priv
->minor
->dev
;
326 DRM_DEBUG("fd = %d, device = 0x%lx\n", fd
,
327 (long)old_encode_dev(priv
->minor
->device
));
328 retcode
= fasync_helper(fd
, filp
, on
, &dev
->buf_async
);
333 EXPORT_SYMBOL(drm_fasync
);
336 * Reclaim locked buffers; note that this may be a bad idea if the current
337 * context doesn't have the hw lock...
339 static void drm_reclaim_locked_buffers(struct drm_device
*dev
, struct file
*f
)
341 struct drm_file
*file_priv
= f
->private_data
;
343 if (drm_i_have_hw_lock(dev
, file_priv
)) {
344 dev
->driver
->reclaim_buffers_locked(dev
, file_priv
);
346 unsigned long _end
= jiffies
+ 3 * DRM_HZ
;
349 drm_idlelock_take(&file_priv
->master
->lock
);
355 spin_lock_bh(&file_priv
->master
->lock
.spinlock
);
356 locked
= file_priv
->master
->lock
.idle_has_lock
;
357 spin_unlock_bh(&file_priv
->master
->lock
.spinlock
);
361 } while (!time_after_eq(jiffies
, _end
));
364 DRM_ERROR("reclaim_buffers_locked() deadlock. Please rework this\n"
365 "\tdriver to use reclaim_buffers_idlelocked() instead.\n"
366 "\tI will go on reclaiming the buffers anyway.\n");
369 dev
->driver
->reclaim_buffers_locked(dev
, file_priv
);
370 drm_idlelock_release(&file_priv
->master
->lock
);
374 static void drm_master_release(struct drm_device
*dev
, struct file
*filp
)
376 struct drm_file
*file_priv
= filp
->private_data
;
378 if (dev
->driver
->reclaim_buffers_locked
&&
379 file_priv
->master
->lock
.hw_lock
)
380 drm_reclaim_locked_buffers(dev
, filp
);
382 if (dev
->driver
->reclaim_buffers_idlelocked
&&
383 file_priv
->master
->lock
.hw_lock
) {
384 drm_idlelock_take(&file_priv
->master
->lock
);
385 dev
->driver
->reclaim_buffers_idlelocked(dev
, file_priv
);
386 drm_idlelock_release(&file_priv
->master
->lock
);
390 if (drm_i_have_hw_lock(dev
, file_priv
)) {
391 DRM_DEBUG("File %p released, freeing lock for context %d\n",
392 filp
, _DRM_LOCKING_CONTEXT(file_priv
->master
->lock
.hw_lock
->lock
));
393 drm_lock_free(&file_priv
->master
->lock
,
394 _DRM_LOCKING_CONTEXT(file_priv
->master
->lock
.hw_lock
->lock
));
397 if (drm_core_check_feature(dev
, DRIVER_HAVE_DMA
) &&
398 !dev
->driver
->reclaim_buffers_locked
) {
399 dev
->driver
->reclaim_buffers(dev
, file_priv
);
406 * \param inode device inode
407 * \param file_priv DRM file private.
408 * \return zero on success or a negative number on failure.
410 * If the hardware lock is held then free it, and take it again for the kernel
411 * context since it's necessary to reclaim buffers. Unlink the file private
412 * data from its list and free it. Decreases the open count and if it reaches
413 * zero calls drm_lastclose().
415 int drm_release(struct inode
*inode
, struct file
*filp
)
417 struct drm_file
*file_priv
= filp
->private_data
;
418 struct drm_device
*dev
= file_priv
->minor
->dev
;
423 DRM_DEBUG("open_count = %d\n", dev
->open_count
);
425 if (dev
->driver
->preclose
)
426 dev
->driver
->preclose(dev
, file_priv
);
428 /* ========================================================
429 * Begin inline drm_release
432 DRM_DEBUG("pid = %d, device = 0x%lx, open_count = %d\n",
433 task_pid_nr(current
),
434 (long)old_encode_dev(file_priv
->minor
->device
),
437 /* if the master has gone away we can't do anything with the lock */
438 if (file_priv
->minor
->master
)
439 drm_master_release(dev
, filp
);
441 if (dev
->driver
->driver_features
& DRIVER_GEM
)
442 drm_gem_release(dev
, file_priv
);
444 mutex_lock(&dev
->ctxlist_mutex
);
445 if (!list_empty(&dev
->ctxlist
)) {
446 struct drm_ctx_list
*pos
, *n
;
448 list_for_each_entry_safe(pos
, n
, &dev
->ctxlist
, head
) {
449 if (pos
->tag
== file_priv
&&
450 pos
->handle
!= DRM_KERNEL_CONTEXT
) {
451 if (dev
->driver
->context_dtor
)
452 dev
->driver
->context_dtor(dev
,
455 drm_ctxbitmap_free(dev
, pos
->handle
);
457 list_del(&pos
->head
);
458 drm_free(pos
, sizeof(*pos
), DRM_MEM_CTXLIST
);
463 mutex_unlock(&dev
->ctxlist_mutex
);
465 mutex_lock(&dev
->struct_mutex
);
467 if (file_priv
->is_master
) {
468 struct drm_file
*temp
;
469 list_for_each_entry(temp
, &dev
->filelist
, lhead
) {
470 if ((temp
->master
== file_priv
->master
) &&
472 temp
->authenticated
= 0;
475 if (file_priv
->minor
->master
== file_priv
->master
) {
476 /* drop the reference held my the minor */
477 drm_master_put(&file_priv
->minor
->master
);
481 /* drop the reference held my the file priv */
482 drm_master_put(&file_priv
->master
);
483 file_priv
->is_master
= 0;
484 list_del(&file_priv
->lhead
);
485 mutex_unlock(&dev
->struct_mutex
);
487 if (dev
->driver
->postclose
)
488 dev
->driver
->postclose(dev
, file_priv
);
489 drm_free(file_priv
, sizeof(*file_priv
), DRM_MEM_FILES
);
491 /* ========================================================
492 * End inline drm_release
495 atomic_inc(&dev
->counts
[_DRM_STAT_CLOSES
]);
496 spin_lock(&dev
->count_lock
);
497 if (!--dev
->open_count
) {
498 if (atomic_read(&dev
->ioctl_count
)) {
499 DRM_ERROR("Device busy: %d\n",
500 atomic_read(&dev
->ioctl_count
));
501 spin_unlock(&dev
->count_lock
);
505 spin_unlock(&dev
->count_lock
);
507 return drm_lastclose(dev
);
509 spin_unlock(&dev
->count_lock
);
515 EXPORT_SYMBOL(drm_release
);
518 unsigned int drm_poll(struct file
*filp
, struct poll_table_struct
*wait
)
522 EXPORT_SYMBOL(drm_poll
);