2 * \author Rickard E. (Rik) Faith <faith@valinux.com>
3 * \author Daryll Strauss <daryll@valinux.com>
4 * \author Gareth Hughes <gareth@valinux.com>
8 * Created: Mon Jan 4 08:58:31 1999 by faith@valinux.com
10 * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
11 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
12 * All Rights Reserved.
14 * Permission is hereby granted, free of charge, to any person obtaining a
15 * copy of this software and associated documentation files (the "Software"),
16 * to deal in the Software without restriction, including without limitation
17 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
18 * and/or sell copies of the Software, and to permit persons to whom the
19 * Software is furnished to do so, subject to the following conditions:
21 * The above copyright notice and this permission notice (including the next
22 * paragraph) shall be included in all copies or substantial portions of the
25 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
26 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
27 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
28 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
29 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
30 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
31 * OTHER DEALINGS IN THE SOFTWARE.
34 #include <linux/anon_inodes.h>
35 #include <linux/dma-fence.h>
36 #include <linux/file.h>
37 #include <linux/module.h>
38 #include <linux/pci.h>
39 #include <linux/poll.h>
40 #include <linux/slab.h>
42 #include <drm/drm_client.h>
43 #include <drm/drm_drv.h>
44 #include <drm/drm_file.h>
45 #include <drm/drm_print.h>
47 #include "drm_crtc_internal.h"
48 #include "drm_internal.h"
49 #include "drm_legacy.h"
51 #if defined(CONFIG_MMU) && defined(CONFIG_TRANSPARENT_HUGEPAGE)
52 #include <uapi/asm/mman.h>
53 #include <drm/drm_vma_manager.h>
56 /* from BKL pushdown */
57 DEFINE_MUTEX(drm_global_mutex);
59 bool drm_dev_needs_global_mutex(struct drm_device *dev)
62 * Legacy drivers rely on all kinds of BKL locking semantics, don't
63 * bother. They also still need BKL locking for their ioctls, so better
66 if (drm_core_check_feature(dev, DRIVER_LEGACY))
70 * The deprecated ->load callback must be called after the driver is
71 * already registered. This means such drivers rely on the BKL to make
72 * sure an open can't proceed until the driver is actually fully set up.
73 * Similar hilarity holds for the unload callback.
75 if (dev->driver->load || dev->driver->unload)
79 * Drivers with the lastclose callback assume that it's synchronized
80 * against concurrent opens, which again needs the BKL. The proper fix
81 * is to use the drm_client infrastructure with proper locking for each
84 if (dev->driver->lastclose)
91 * DOC: file operations
93 * Drivers must define the file operations structure that forms the DRM
94 * userspace API entry point, even though most of those operations are
95 * implemented in the DRM core. The resulting &struct file_operations must be
96 * stored in the &drm_driver.fops field. The mandatory functions are drm_open(),
97 * drm_read(), drm_ioctl() and drm_compat_ioctl() if CONFIG_COMPAT is enabled
98 * Note that drm_compat_ioctl will be NULL if CONFIG_COMPAT=n, so there's no
99 * need to sprinkle #ifdef into the code. Drivers which implement private ioctls
100 * that require 32/64 bit compatibility support must provide their own
101 * &file_operations.compat_ioctl handler that processes private ioctls and calls
102 * drm_compat_ioctl() for core ioctls.
104 * In addition drm_read() and drm_poll() provide support for DRM events. DRM
105 * events are a generic and extensible means to send asynchronous events to
106 * userspace through the file descriptor. They are used to send vblank event and
107 * page flip completions by the KMS API. But drivers can also use it for their
108 * own needs, e.g. to signal completion of rendering.
110 * For the driver-side event interface see drm_event_reserve_init() and
111 * drm_send_event() as the main starting points.
113 * The memory mapping implementation will vary depending on how the driver
114 * manages memory. Legacy drivers will use the deprecated drm_legacy_mmap()
115 * function, modern drivers should use one of the provided memory-manager
116 * specific implementations. For GEM-based drivers this is drm_gem_mmap().
118 * No other file operations are supported by the DRM userspace API. Overall the
119 * following is an example &file_operations structure::
121 * static const example_drm_fops = {
122 * .owner = THIS_MODULE,
124 * .release = drm_release,
125 * .unlocked_ioctl = drm_ioctl,
126 * .compat_ioctl = drm_compat_ioctl, // NULL if CONFIG_COMPAT=n
129 * .llseek = no_llseek,
130 * .mmap = drm_gem_mmap,
133 * For plain GEM based drivers there is the DEFINE_DRM_GEM_FOPS() macro, and for
134 * CMA based drivers there is the DEFINE_DRM_GEM_CMA_FOPS() macro to make this
137 * The driver's &file_operations must be stored in &drm_driver.fops.
139 * For driver-private IOCTL handling see the more detailed discussion in
140 * :ref:`IOCTL support in the userland interfaces chapter<drm_driver_ioctl>`.
144 * drm_file_alloc - allocate file context
145 * @minor: minor to allocate on
147 * This allocates a new DRM file context. It is not linked into any context and
148 * can be used by the caller freely. Note that the context keeps a pointer to
149 * @minor, so it must be freed before @minor is.
152 * Pointer to newly allocated context, ERR_PTR on failure.
154 struct drm_file *drm_file_alloc(struct drm_minor *minor)
156 struct drm_device *dev = minor->dev;
157 struct drm_file *file;
160 file = kzalloc(sizeof(*file), GFP_KERNEL);
162 return ERR_PTR(-ENOMEM);
164 file->pid = get_pid(task_pid(current));
167 /* for compatibility root is always authenticated */
168 file->authenticated = capable(CAP_SYS_ADMIN);
170 INIT_LIST_HEAD(&file->lhead);
171 INIT_LIST_HEAD(&file->fbs);
172 mutex_init(&file->fbs_lock);
173 INIT_LIST_HEAD(&file->blobs);
174 INIT_LIST_HEAD(&file->pending_event_list);
175 INIT_LIST_HEAD(&file->event_list);
176 init_waitqueue_head(&file->event_wait);
177 file->event_space = 4096; /* set aside 4k for event buffer */
179 mutex_init(&file->event_read_lock);
181 if (drm_core_check_feature(dev, DRIVER_GEM))
182 drm_gem_open(dev, file);
184 if (drm_core_check_feature(dev, DRIVER_SYNCOBJ))
185 drm_syncobj_open(file);
187 drm_prime_init_file_private(&file->prime);
189 if (dev->driver->open) {
190 ret = dev->driver->open(dev, file);
192 goto out_prime_destroy;
198 drm_prime_destroy_file_private(&file->prime);
199 if (drm_core_check_feature(dev, DRIVER_SYNCOBJ))
200 drm_syncobj_release(file);
201 if (drm_core_check_feature(dev, DRIVER_GEM))
202 drm_gem_release(dev, file);
209 static void drm_events_release(struct drm_file *file_priv)
211 struct drm_device *dev = file_priv->minor->dev;
212 struct drm_pending_event *e, *et;
215 spin_lock_irqsave(&dev->event_lock, flags);
217 /* Unlink pending events */
218 list_for_each_entry_safe(e, et, &file_priv->pending_event_list,
220 list_del(&e->pending_link);
224 /* Remove unconsumed events */
225 list_for_each_entry_safe(e, et, &file_priv->event_list, link) {
230 spin_unlock_irqrestore(&dev->event_lock, flags);
234 * drm_file_free - free file context
235 * @file: context to free, or NULL
237 * This destroys and deallocates a DRM file context previously allocated via
238 * drm_file_alloc(). The caller must make sure to unlink it from any contexts
239 * before calling this.
241 * If NULL is passed, this is a no-op.
243 void drm_file_free(struct drm_file *file)
245 struct drm_device *dev;
250 dev = file->minor->dev;
252 DRM_DEBUG("comm=\"%s\", pid=%d, dev=0x%lx, open_count=%d\n",
253 current->comm, task_pid_nr(current),
254 (long)old_encode_dev(file->minor->kdev->devt),
255 atomic_read(&dev->open_count));
257 #ifdef CONFIG_DRM_LEGACY
258 if (drm_core_check_feature(dev, DRIVER_LEGACY) &&
259 dev->driver->preclose)
260 dev->driver->preclose(dev, file);
263 if (drm_core_check_feature(dev, DRIVER_LEGACY))
264 drm_legacy_lock_release(dev, file->filp);
266 if (drm_core_check_feature(dev, DRIVER_HAVE_DMA))
267 drm_legacy_reclaim_buffers(dev, file);
269 drm_events_release(file);
271 if (drm_core_check_feature(dev, DRIVER_MODESET)) {
272 drm_fb_release(file);
273 drm_property_destroy_user_blobs(dev, file);
276 if (drm_core_check_feature(dev, DRIVER_SYNCOBJ))
277 drm_syncobj_release(file);
279 if (drm_core_check_feature(dev, DRIVER_GEM))
280 drm_gem_release(dev, file);
282 drm_legacy_ctxbitmap_flush(dev, file);
284 if (drm_is_primary_client(file))
285 drm_master_release(file);
287 if (dev->driver->postclose)
288 dev->driver->postclose(dev, file);
290 drm_prime_destroy_file_private(&file->prime);
292 WARN_ON(!list_empty(&file->event_list));
298 static void drm_close_helper(struct file *filp)
300 struct drm_file *file_priv = filp->private_data;
301 struct drm_device *dev = file_priv->minor->dev;
303 mutex_lock(&dev->filelist_mutex);
304 list_del(&file_priv->lhead);
305 mutex_unlock(&dev->filelist_mutex);
307 drm_file_free(file_priv);
311 * Check whether DRI will run on this CPU.
313 * \return non-zero if the DRI will run on this CPU, or zero otherwise.
315 static int drm_cpu_valid(void)
317 #if defined(__sparc__) && !defined(__sparc_v9__)
318 return 0; /* No cmpxchg before v9 sparc. */
324 * Called whenever a process opens a drm node
326 * \param filp file pointer.
327 * \param minor acquired minor-object.
328 * \return zero on success or a negative number on failure.
330 * Creates and initializes a drm_file structure for the file private data in \p
331 * filp and add it into the double linked list in \p dev.
333 static int drm_open_helper(struct file *filp, struct drm_minor *minor)
335 struct drm_device *dev = minor->dev;
336 struct drm_file *priv;
339 if (filp->f_flags & O_EXCL)
340 return -EBUSY; /* No exclusive opens */
341 if (!drm_cpu_valid())
343 if (dev->switch_power_state != DRM_SWITCH_POWER_ON &&
344 dev->switch_power_state != DRM_SWITCH_POWER_DYNAMIC_OFF)
347 DRM_DEBUG("comm=\"%s\", pid=%d, minor=%d\n", current->comm,
348 task_pid_nr(current), minor->index);
350 priv = drm_file_alloc(minor);
352 return PTR_ERR(priv);
354 if (drm_is_primary_client(priv)) {
355 ret = drm_master_open(priv);
362 filp->private_data = priv;
363 filp->f_mode |= FMODE_UNSIGNED_OFFSET;
366 mutex_lock(&dev->filelist_mutex);
367 list_add(&priv->lhead, &dev->filelist);
368 mutex_unlock(&dev->filelist_mutex);
375 struct pci_dev *pci_dev;
377 pci_dev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, NULL);
379 dev->hose = pci_dev->sysdata;
380 pci_dev_put(pci_dev);
383 struct pci_bus *b = list_entry(pci_root_buses.next,
384 struct pci_bus, node);
386 dev->hose = b->sysdata;
395 * drm_open - open method for DRM file
396 * @inode: device inode
397 * @filp: file pointer.
399 * This function must be used by drivers as their &file_operations.open method.
400 * It looks up the correct DRM device and instantiates all the per-file
401 * resources for it. It also calls the &drm_driver.open driver callback.
405 * 0 on success or negative errno value on falure.
407 int drm_open(struct inode *inode, struct file *filp)
409 struct drm_device *dev;
410 struct drm_minor *minor;
414 minor = drm_minor_acquire(iminor(inode));
416 return PTR_ERR(minor);
419 if (drm_dev_needs_global_mutex(dev))
420 mutex_lock(&drm_global_mutex);
422 if (!atomic_fetch_inc(&dev->open_count))
425 /* share address_space across all char-devs of a single device */
426 filp->f_mapping = dev->anon_inode->i_mapping;
428 retcode = drm_open_helper(filp, minor);
432 retcode = drm_legacy_setup(dev);
434 drm_close_helper(filp);
439 if (drm_dev_needs_global_mutex(dev))
440 mutex_unlock(&drm_global_mutex);
445 atomic_dec(&dev->open_count);
446 if (drm_dev_needs_global_mutex(dev))
447 mutex_unlock(&drm_global_mutex);
448 drm_minor_release(minor);
451 EXPORT_SYMBOL(drm_open);
453 void drm_lastclose(struct drm_device * dev)
457 if (dev->driver->lastclose)
458 dev->driver->lastclose(dev);
459 DRM_DEBUG("driver lastclose completed\n");
461 if (drm_core_check_feature(dev, DRIVER_LEGACY))
462 drm_legacy_dev_reinit(dev);
464 drm_client_dev_restore(dev);
468 * drm_release - release method for DRM file
469 * @inode: device inode
470 * @filp: file pointer.
472 * This function must be used by drivers as their &file_operations.release
473 * method. It frees any resources associated with the open file, and calls the
474 * &drm_driver.postclose driver callback. If this is the last open file for the
475 * DRM device also proceeds to call the &drm_driver.lastclose driver callback.
479 * Always succeeds and returns 0.
481 int drm_release(struct inode *inode, struct file *filp)
483 struct drm_file *file_priv = filp->private_data;
484 struct drm_minor *minor = file_priv->minor;
485 struct drm_device *dev = minor->dev;
487 if (drm_dev_needs_global_mutex(dev))
488 mutex_lock(&drm_global_mutex);
490 DRM_DEBUG("open_count = %d\n", atomic_read(&dev->open_count));
492 drm_close_helper(filp);
494 if (atomic_dec_and_test(&dev->open_count))
497 if (drm_dev_needs_global_mutex(dev))
498 mutex_unlock(&drm_global_mutex);
500 drm_minor_release(minor);
504 EXPORT_SYMBOL(drm_release);
507 * drm_release_noglobal - release method for DRM file
508 * @inode: device inode
509 * @filp: file pointer.
511 * This function may be used by drivers as their &file_operations.release
512 * method. It frees any resources associated with the open file prior to taking
513 * the drm_global_mutex, which then calls the &drm_driver.postclose driver
514 * callback. If this is the last open file for the DRM device also proceeds to
515 * call the &drm_driver.lastclose driver callback.
519 * Always succeeds and returns 0.
521 int drm_release_noglobal(struct inode *inode, struct file *filp)
523 struct drm_file *file_priv = filp->private_data;
524 struct drm_minor *minor = file_priv->minor;
525 struct drm_device *dev = minor->dev;
527 drm_close_helper(filp);
529 if (atomic_dec_and_mutex_lock(&dev->open_count, &drm_global_mutex)) {
531 mutex_unlock(&drm_global_mutex);
534 drm_minor_release(minor);
538 EXPORT_SYMBOL(drm_release_noglobal);
541 * drm_read - read method for DRM file
542 * @filp: file pointer
543 * @buffer: userspace destination pointer for the read
544 * @count: count in bytes to read
545 * @offset: offset to read
547 * This function must be used by drivers as their &file_operations.read
548 * method iff they use DRM events for asynchronous signalling to userspace.
549 * Since events are used by the KMS API for vblank and page flip completion this
550 * means all modern display drivers must use it.
552 * @offset is ignored, DRM events are read like a pipe. Therefore drivers also
553 * must set the &file_operation.llseek to no_llseek(). Polling support is
554 * provided by drm_poll().
556 * This function will only ever read a full event. Therefore userspace must
557 * supply a big enough buffer to fit any event to ensure forward progress. Since
558 * the maximum event space is currently 4K it's recommended to just use that for
563 * Number of bytes read (always aligned to full events, and can be 0) or a
564 * negative error code on failure.
566 ssize_t drm_read(struct file *filp, char __user *buffer,
567 size_t count, loff_t *offset)
569 struct drm_file *file_priv = filp->private_data;
570 struct drm_device *dev = file_priv->minor->dev;
573 ret = mutex_lock_interruptible(&file_priv->event_read_lock);
578 struct drm_pending_event *e = NULL;
580 spin_lock_irq(&dev->event_lock);
581 if (!list_empty(&file_priv->event_list)) {
582 e = list_first_entry(&file_priv->event_list,
583 struct drm_pending_event, link);
584 file_priv->event_space += e->event->length;
587 spin_unlock_irq(&dev->event_lock);
593 if (filp->f_flags & O_NONBLOCK) {
598 mutex_unlock(&file_priv->event_read_lock);
599 ret = wait_event_interruptible(file_priv->event_wait,
600 !list_empty(&file_priv->event_list));
602 ret = mutex_lock_interruptible(&file_priv->event_read_lock);
606 unsigned length = e->event->length;
608 if (length > count - ret) {
610 spin_lock_irq(&dev->event_lock);
611 file_priv->event_space -= length;
612 list_add(&e->link, &file_priv->event_list);
613 spin_unlock_irq(&dev->event_lock);
614 wake_up_interruptible_poll(&file_priv->event_wait,
615 EPOLLIN | EPOLLRDNORM);
619 if (copy_to_user(buffer + ret, e->event, length)) {
629 mutex_unlock(&file_priv->event_read_lock);
633 EXPORT_SYMBOL(drm_read);
636 * drm_poll - poll method for DRM file
637 * @filp: file pointer
638 * @wait: poll waiter table
640 * This function must be used by drivers as their &file_operations.read method
641 * iff they use DRM events for asynchronous signalling to userspace. Since
642 * events are used by the KMS API for vblank and page flip completion this means
643 * all modern display drivers must use it.
645 * See also drm_read().
649 * Mask of POLL flags indicating the current status of the file.
651 __poll_t drm_poll(struct file *filp, struct poll_table_struct *wait)
653 struct drm_file *file_priv = filp->private_data;
656 poll_wait(filp, &file_priv->event_wait, wait);
658 if (!list_empty(&file_priv->event_list))
659 mask |= EPOLLIN | EPOLLRDNORM;
663 EXPORT_SYMBOL(drm_poll);
666 * drm_event_reserve_init_locked - init a DRM event and reserve space for it
668 * @file_priv: DRM file private data
669 * @p: tracking structure for the pending event
670 * @e: actual event data to deliver to userspace
672 * This function prepares the passed in event for eventual delivery. If the event
673 * doesn't get delivered (because the IOCTL fails later on, before queuing up
674 * anything) then the even must be cancelled and freed using
675 * drm_event_cancel_free(). Successfully initialized events should be sent out
676 * using drm_send_event() or drm_send_event_locked() to signal completion of the
677 * asynchronous event to userspace.
679 * If callers embedded @p into a larger structure it must be allocated with
680 * kmalloc and @p must be the first member element.
682 * This is the locked version of drm_event_reserve_init() for callers which
683 * already hold &drm_device.event_lock.
687 * 0 on success or a negative error code on failure.
689 int drm_event_reserve_init_locked(struct drm_device *dev,
690 struct drm_file *file_priv,
691 struct drm_pending_event *p,
694 if (file_priv->event_space < e->length)
697 file_priv->event_space -= e->length;
700 list_add(&p->pending_link, &file_priv->pending_event_list);
701 p->file_priv = file_priv;
705 EXPORT_SYMBOL(drm_event_reserve_init_locked);
708 * drm_event_reserve_init - init a DRM event and reserve space for it
710 * @file_priv: DRM file private data
711 * @p: tracking structure for the pending event
712 * @e: actual event data to deliver to userspace
714 * This function prepares the passed in event for eventual delivery. If the event
715 * doesn't get delivered (because the IOCTL fails later on, before queuing up
716 * anything) then the even must be cancelled and freed using
717 * drm_event_cancel_free(). Successfully initialized events should be sent out
718 * using drm_send_event() or drm_send_event_locked() to signal completion of the
719 * asynchronous event to userspace.
721 * If callers embedded @p into a larger structure it must be allocated with
722 * kmalloc and @p must be the first member element.
724 * Callers which already hold &drm_device.event_lock should use
725 * drm_event_reserve_init_locked() instead.
729 * 0 on success or a negative error code on failure.
731 int drm_event_reserve_init(struct drm_device *dev,
732 struct drm_file *file_priv,
733 struct drm_pending_event *p,
739 spin_lock_irqsave(&dev->event_lock, flags);
740 ret = drm_event_reserve_init_locked(dev, file_priv, p, e);
741 spin_unlock_irqrestore(&dev->event_lock, flags);
745 EXPORT_SYMBOL(drm_event_reserve_init);
748 * drm_event_cancel_free - free a DRM event and release its space
750 * @p: tracking structure for the pending event
752 * This function frees the event @p initialized with drm_event_reserve_init()
753 * and releases any allocated space. It is used to cancel an event when the
754 * nonblocking operation could not be submitted and needed to be aborted.
756 void drm_event_cancel_free(struct drm_device *dev,
757 struct drm_pending_event *p)
761 spin_lock_irqsave(&dev->event_lock, flags);
763 p->file_priv->event_space += p->event->length;
764 list_del(&p->pending_link);
766 spin_unlock_irqrestore(&dev->event_lock, flags);
769 dma_fence_put(p->fence);
773 EXPORT_SYMBOL(drm_event_cancel_free);
776 * drm_send_event_locked - send DRM event to file descriptor
778 * @e: DRM event to deliver
780 * This function sends the event @e, initialized with drm_event_reserve_init(),
781 * to its associated userspace DRM file. Callers must already hold
782 * &drm_device.event_lock, see drm_send_event() for the unlocked version.
784 * Note that the core will take care of unlinking and disarming events when the
785 * corresponding DRM file is closed. Drivers need not worry about whether the
786 * DRM file for this event still exists and can call this function upon
787 * completion of the asynchronous work unconditionally.
789 void drm_send_event_locked(struct drm_device *dev, struct drm_pending_event *e)
791 assert_spin_locked(&dev->event_lock);
794 complete_all(e->completion);
795 e->completion_release(e->completion);
796 e->completion = NULL;
800 dma_fence_signal(e->fence);
801 dma_fence_put(e->fence);
809 list_del(&e->pending_link);
810 list_add_tail(&e->link,
811 &e->file_priv->event_list);
812 wake_up_interruptible_poll(&e->file_priv->event_wait,
813 EPOLLIN | EPOLLRDNORM);
815 EXPORT_SYMBOL(drm_send_event_locked);
818 * drm_send_event - send DRM event to file descriptor
820 * @e: DRM event to deliver
822 * This function sends the event @e, initialized with drm_event_reserve_init(),
823 * to its associated userspace DRM file. This function acquires
824 * &drm_device.event_lock, see drm_send_event_locked() for callers which already
827 * Note that the core will take care of unlinking and disarming events when the
828 * corresponding DRM file is closed. Drivers need not worry about whether the
829 * DRM file for this event still exists and can call this function upon
830 * completion of the asynchronous work unconditionally.
832 void drm_send_event(struct drm_device *dev, struct drm_pending_event *e)
834 unsigned long irqflags;
836 spin_lock_irqsave(&dev->event_lock, irqflags);
837 drm_send_event_locked(dev, e);
838 spin_unlock_irqrestore(&dev->event_lock, irqflags);
840 EXPORT_SYMBOL(drm_send_event);
843 * mock_drm_getfile - Create a new struct file for the drm device
844 * @minor: drm minor to wrap (e.g. #drm_device.primary)
845 * @flags: file creation mode (O_RDWR etc)
847 * This create a new struct file that wraps a DRM file context around a
848 * DRM minor. This mimicks userspace opening e.g. /dev/dri/card0, but without
849 * invoking userspace. The struct file may be operated on using its f_op
850 * (the drm_device.driver.fops) to mimick userspace operations, or be supplied
851 * to userspace facing functions as an internal/anonymous client.
854 * Pointer to newly created struct file, ERR_PTR on failure.
856 struct file *mock_drm_getfile(struct drm_minor *minor, unsigned int flags)
858 struct drm_device *dev = minor->dev;
859 struct drm_file *priv;
862 priv = drm_file_alloc(minor);
864 return ERR_CAST(priv);
866 file = anon_inode_getfile("drm", dev->driver->fops, priv, flags);
872 /* Everyone shares a single global address space */
873 file->f_mapping = dev->anon_inode->i_mapping;
880 EXPORT_SYMBOL_FOR_TESTS_ONLY(mock_drm_getfile);
883 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
885 * drm_addr_inflate() attempts to construct an aligned area by inflating
886 * the area size and skipping the unaligned start of the area.
887 * adapted from shmem_get_unmapped_area()
889 static unsigned long drm_addr_inflate(unsigned long addr,
893 unsigned long huge_size)
895 unsigned long offset, inflated_len;
896 unsigned long inflated_addr;
897 unsigned long inflated_offset;
899 offset = (pgoff << PAGE_SHIFT) & (huge_size - 1);
900 if (offset && offset + len < 2 * huge_size)
902 if ((addr & (huge_size - 1)) == offset)
905 inflated_len = len + huge_size - PAGE_SIZE;
906 if (inflated_len > TASK_SIZE)
908 if (inflated_len < len)
911 inflated_addr = current->mm->get_unmapped_area(NULL, 0, inflated_len,
913 if (IS_ERR_VALUE(inflated_addr))
915 if (inflated_addr & ~PAGE_MASK)
918 inflated_offset = inflated_addr & (huge_size - 1);
919 inflated_addr += offset - inflated_offset;
920 if (inflated_offset > offset)
921 inflated_addr += huge_size;
923 if (inflated_addr > TASK_SIZE - len)
926 return inflated_addr;
930 * drm_get_unmapped_area() - Get an unused user-space virtual memory area
931 * suitable for huge page table entries.
932 * @file: The struct file representing the address space being mmap()'d.
933 * @uaddr: Start address suggested by user-space.
934 * @len: Length of the area.
935 * @pgoff: The page offset into the address space.
937 * @mgr: The address space manager used by the drm driver. This argument can
938 * probably be removed at some point when all drivers use the same
939 * address space manager.
941 * This function attempts to find an unused user-space virtual memory area
942 * that can accommodate the size we want to map, and that is properly
943 * aligned to facilitate huge page table entries matching actual
944 * huge pages or huge page aligned memory in buffer objects. Buffer objects
945 * are assumed to start at huge page boundary pfns (io memory) or be
946 * populated by huge pages aligned to the start of the buffer object
947 * (system- or coherent memory). Adapted from shmem_get_unmapped_area.
949 * Return: aligned user-space address.
951 unsigned long drm_get_unmapped_area(struct file *file,
952 unsigned long uaddr, unsigned long len,
953 unsigned long pgoff, unsigned long flags,
954 struct drm_vma_offset_manager *mgr)
957 unsigned long inflated_addr;
958 struct drm_vma_offset_node *node;
964 * @pgoff is the file page-offset the huge page boundaries of
965 * which typically aligns to physical address huge page boundaries.
966 * That's not true for DRM, however, where physical address huge
967 * page boundaries instead are aligned with the offset from
968 * buffer object start. So adjust @pgoff to be the offset from
969 * buffer object start.
971 drm_vma_offset_lock_lookup(mgr);
972 node = drm_vma_offset_lookup_locked(mgr, pgoff, 1);
974 pgoff -= node->vm_node.start;
975 drm_vma_offset_unlock_lookup(mgr);
977 addr = current->mm->get_unmapped_area(file, uaddr, len, pgoff, flags);
978 if (IS_ERR_VALUE(addr))
980 if (addr & ~PAGE_MASK)
982 if (addr > TASK_SIZE - len)
985 if (len < HPAGE_PMD_SIZE)
987 if (flags & MAP_FIXED)
990 * Our priority is to support MAP_SHARED mapped hugely;
991 * and support MAP_PRIVATE mapped hugely too, until it is COWed.
992 * But if caller specified an address hint, respect that as before.
997 inflated_addr = drm_addr_inflate(addr, len, pgoff, flags,
1000 if (IS_ENABLED(CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD) &&
1001 len >= HPAGE_PUD_SIZE)
1002 inflated_addr = drm_addr_inflate(inflated_addr, len, pgoff,
1003 flags, HPAGE_PUD_SIZE);
1004 return inflated_addr;
1006 #else /* CONFIG_TRANSPARENT_HUGEPAGE */
1007 unsigned long drm_get_unmapped_area(struct file *file,
1008 unsigned long uaddr, unsigned long len,
1009 unsigned long pgoff, unsigned long flags,
1010 struct drm_vma_offset_manager *mgr)
1012 return current->mm->get_unmapped_area(file, uaddr, len, pgoff, flags);
1014 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
1015 EXPORT_SYMBOL_GPL(drm_get_unmapped_area);
1016 #endif /* CONFIG_MMU */