OSCL-LXR linux-6.0.1/​drivers/​gpu/​drm/​drm_file.c	Source navigation Diff markup Identifier search General search
	Version: linux-6.0.1 spark-3.0.0 hadoop-3.2.0-src hadoop-3.3.0-src spark-2.4.7 linux-4.15.13 hadoop-2.7.4-src Revert   Change

 /*
  * \author Rickard E. (Rik) Faith <faith@valinux.com>
  * \author Daryll Strauss <daryll@valinux.com>
  * \author Gareth Hughes <gareth@valinux.com>
  */
 
 /*
  * Created: Mon Jan  4 08:58:31 1999 by faith@valinux.com
  *
  * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
  * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
  * All Rights Reserved.
  *
  * Permission is hereby granted, free of charge, to any person obtaining a
  * copy of this software and associated documentation files (the "Software"),
  * to deal in the Software without restriction, including without limitation
  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  * and/or sell copies of the Software, and to permit persons to whom the
  * Software is furnished to do so, subject to the following conditions:
  *
  * The above copyright notice and this permission notice (including the next
  * paragraph) shall be included in all copies or substantial portions of the
  * Software.
  *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  * OTHER DEALINGS IN THE SOFTWARE.
  */
 
 #include <linux/anon_inodes.h>
 #include <linux/dma-fence.h>
 #include <linux/file.h>
 #include <linux/module.h>
 #include <linux/pci.h>
 #include <linux/poll.h>
 #include <linux/slab.h>
 
 #include <drm/drm_client.h>
 #include <drm/drm_drv.h>
 #include <drm/drm_file.h>
 #include <drm/drm_print.h>
 
 #include "drm_crtc_internal.h"
 #include "drm_internal.h"
 #include "drm_legacy.h"
 
 #if defined(CONFIG_MMU) && defined(CONFIG_TRANSPARENT_HUGEPAGE)
 #include <uapi/asm/mman.h>
 #include <drm/drm_vma_manager.h>
 #endif
 
 /* from BKL pushdown */
 DEFINE_MUTEX(drm_global_mutex);
 
 bool drm_dev_needs_global_mutex(struct drm_device *dev)
 {
     /*
      * Legacy drivers rely on all kinds of BKL locking semantics, don't
      * bother. They also still need BKL locking for their ioctls, so better
      * safe than sorry.
      */
     if (drm_core_check_feature(dev, DRIVER_LEGACY))
         return true;
 
     /*
      * The deprecated ->load callback must be called after the driver is
      * already registered. This means such drivers rely on the BKL to make
      * sure an open can't proceed until the driver is actually fully set up.
      * Similar hilarity holds for the unload callback.
      */
     if (dev->driver->load || dev->driver->unload)
         return true;
 
     /*
      * Drivers with the lastclose callback assume that it's synchronized
      * against concurrent opens, which again needs the BKL. The proper fix
      * is to use the drm_client infrastructure with proper locking for each
      * client.
      */
     if (dev->driver->lastclose)
         return true;
 
     return false;
 }
 
 /**
  * DOC: file operations
  *
  * Drivers must define the file operations structure that forms the DRM
  * userspace API entry point, even though most of those operations are
  * implemented in the DRM core. The resulting &struct file_operations must be
  * stored in the &drm_driver.fops field. The mandatory functions are drm_open(),
  * drm_read(), drm_ioctl() and drm_compat_ioctl() if CONFIG_COMPAT is enabled
  * Note that drm_compat_ioctl will be NULL if CONFIG_COMPAT=n, so there's no
  * need to sprinkle #ifdef into the code. Drivers which implement private ioctls
  * that require 32/64 bit compatibility support must provide their own
  * &file_operations.compat_ioctl handler that processes private ioctls and calls
  * drm_compat_ioctl() for core ioctls.
  *
  * In addition drm_read() and drm_poll() provide support for DRM events. DRM
  * events are a generic and extensible means to send asynchronous events to
  * userspace through the file descriptor. They are used to send vblank event and
  * page flip completions by the KMS API. But drivers can also use it for their
  * own needs, e.g. to signal completion of rendering.
  *
  * For the driver-side event interface see drm_event_reserve_init() and
  * drm_send_event() as the main starting points.
  *
  * The memory mapping implementation will vary depending on how the driver
  * manages memory. Legacy drivers will use the deprecated drm_legacy_mmap()
  * function, modern drivers should use one of the provided memory-manager
  * specific implementations. For GEM-based drivers this is drm_gem_mmap().
  *
  * No other file operations are supported by the DRM userspace API. Overall the
  * following is an example &file_operations structure::
  *
  *     static const example_drm_fops = {
  *             .owner = THIS_MODULE,
  *             .open = drm_open,
  *             .release = drm_release,
  *             .unlocked_ioctl = drm_ioctl,
  *             .compat_ioctl = drm_compat_ioctl, // NULL if CONFIG_COMPAT=n
  *             .poll = drm_poll,
  *             .read = drm_read,
  *             .llseek = no_llseek,
  *             .mmap = drm_gem_mmap,
  *     };
  *
  * For plain GEM based drivers there is the DEFINE_DRM_GEM_FOPS() macro, and for
  * CMA based drivers there is the DEFINE_DRM_GEM_CMA_FOPS() macro to make this
  * simpler.
  *
  * The driver's &file_operations must be stored in &drm_driver.fops.
  *
  * For driver-private IOCTL handling see the more detailed discussion in
  * :ref:`IOCTL support in the userland interfaces chapter<drm_driver_ioctl>`.
  */
 
 /**
  * drm_file_alloc - allocate file context
  * @minor: minor to allocate on
  *
  * This allocates a new DRM file context. It is not linked into any context and
  * can be used by the caller freely. Note that the context keeps a pointer to
  * @minor, so it must be freed before @minor is.
  *
  * RETURNS:
  * Pointer to newly allocated context, ERR_PTR on failure.
  */
 struct drm_file *drm_file_alloc(struct drm_minor *minor)
 {
     struct drm_device *dev = minor->dev;
     struct drm_file *file;
     int ret;
 
     file = kzalloc(sizeof(*file), GFP_KERNEL);
     if (!file)
         return ERR_PTR(-ENOMEM);
 
     file->pid = get_pid(task_pid(current));
     file->minor = minor;
 
     /* for compatibility root is always authenticated */
     file->authenticated = capable(CAP_SYS_ADMIN);
 
     INIT_LIST_HEAD(&file->lhead);
     INIT_LIST_HEAD(&file->fbs);
     mutex_init(&file->fbs_lock);
     INIT_LIST_HEAD(&file->blobs);
     INIT_LIST_HEAD(&file->pending_event_list);
     INIT_LIST_HEAD(&file->event_list);
     init_waitqueue_head(&file->event_wait);
     file->event_space = 4096; /* set aside 4k for event buffer */
 
     spin_lock_init(&file->master_lookup_lock);
     mutex_init(&file->event_read_lock);
 
     if (drm_core_check_feature(dev, DRIVER_GEM))
         drm_gem_open(dev, file);
 
     if (drm_core_check_feature(dev, DRIVER_SYNCOBJ))
         drm_syncobj_open(file);
 
     drm_prime_init_file_private(&file->prime);
 
     if (dev->driver->open) {
         ret = dev->driver->open(dev, file);
         if (ret < 0)
             goto out_prime_destroy;
     }
 
     return file;
 
 out_prime_destroy:
     drm_prime_destroy_file_private(&file->prime);
     if (drm_core_check_feature(dev, DRIVER_SYNCOBJ))
         drm_syncobj_release(file);
     if (drm_core_check_feature(dev, DRIVER_GEM))
         drm_gem_release(dev, file);
     put_pid(file->pid);
     kfree(file);
 
     return ERR_PTR(ret);
 }
 
 static void drm_events_release(struct drm_file *file_priv)
 {
     struct drm_device *dev = file_priv->minor->dev;
     struct drm_pending_event *e, *et;
     unsigned long flags;
 
     spin_lock_irqsave(&dev->event_lock, flags);
 
     /* Unlink pending events */
     list_for_each_entry_safe(e, et, &file_priv->pending_event_list,
                  pending_link) {
         list_del(&e->pending_link);
         e->file_priv = NULL;
     }
 
     /* Remove unconsumed events */
     list_for_each_entry_safe(e, et, &file_priv->event_list, link) {
         list_del(&e->link);
         kfree(e);
     }
 
     spin_unlock_irqrestore(&dev->event_lock, flags);
 }
 
 /**
  * drm_file_free - free file context
  * @file: context to free, or NULL
  *
  * This destroys and deallocates a DRM file context previously allocated via
  * drm_file_alloc(). The caller must make sure to unlink it from any contexts
  * before calling this.
  *
  * If NULL is passed, this is a no-op.
  */
 void drm_file_free(struct drm_file *file)
 {
     struct drm_device *dev;
 
     if (!file)
         return;
 
     dev = file->minor->dev;
 
     DRM_DEBUG("comm=\"%s\", pid=%d, dev=0x%lx, open_count=%d\n",
           current->comm, task_pid_nr(current),
           (long)old_encode_dev(file->minor->kdev->devt),
           atomic_read(&dev->open_count));
 
 #ifdef CONFIG_DRM_LEGACY
     if (drm_core_check_feature(dev, DRIVER_LEGACY) &&
         dev->driver->preclose)
         dev->driver->preclose(dev, file);
 #endif
 
     if (drm_core_check_feature(dev, DRIVER_LEGACY))
         drm_legacy_lock_release(dev, file->filp);
 
     if (drm_core_check_feature(dev, DRIVER_HAVE_DMA))
         drm_legacy_reclaim_buffers(dev, file);
 
     drm_events_release(file);
 
     if (drm_core_check_feature(dev, DRIVER_MODESET)) {
         drm_fb_release(file);
         drm_property_destroy_user_blobs(dev, file);
     }
 
     if (drm_core_check_feature(dev, DRIVER_SYNCOBJ))
         drm_syncobj_release(file);
 
     if (drm_core_check_feature(dev, DRIVER_GEM))
         drm_gem_release(dev, file);
 
     drm_legacy_ctxbitmap_flush(dev, file);
 
     if (drm_is_primary_client(file))
         drm_master_release(file);
 
     if (dev->driver->postclose)
         dev->driver->postclose(dev, file);
 
     drm_prime_destroy_file_private(&file->prime);
 
     WARN_ON(!list_empty(&file->event_list));
 
     put_pid(file->pid);
     kfree(file);
 }
 
 static void drm_close_helper(struct file *filp)
 {
     struct drm_file *file_priv = filp->private_data;
     struct drm_device *dev = file_priv->minor->dev;
 
     mutex_lock(&dev->filelist_mutex);
     list_del(&file_priv->lhead);
     mutex_unlock(&dev->filelist_mutex);
 
     drm_file_free(file_priv);
 }
 
 /*
  * Check whether DRI will run on this CPU.
  *
  * \return non-zero if the DRI will run on this CPU, or zero otherwise.
  */
 static int drm_cpu_valid(void)
 {
 #if defined(__sparc__) && !defined(__sparc_v9__)
     return 0;       /* No cmpxchg before v9 sparc. */
 #endif
     return 1;
 }
 
 /*
  * Called whenever a process opens a drm node
  *
  * \param filp file pointer.
  * \param minor acquired minor-object.
  * \return zero on success or a negative number on failure.
  *
  * Creates and initializes a drm_file structure for the file private data in \p
  * filp and add it into the double linked list in \p dev.
  */
 static int drm_open_helper(struct file *filp, struct drm_minor *minor)
 {
     struct drm_device *dev = minor->dev;
     struct drm_file *priv;
     int ret;
 
     if (filp->f_flags & O_EXCL)
         return -EBUSY;  /* No exclusive opens */
     if (!drm_cpu_valid())
         return -EINVAL;
     if (dev->switch_power_state != DRM_SWITCH_POWER_ON &&
         dev->switch_power_state != DRM_SWITCH_POWER_DYNAMIC_OFF)
         return -EINVAL;
 
     DRM_DEBUG("comm=\"%s\", pid=%d, minor=%d\n", current->comm,
           task_pid_nr(current), minor->index);
 
     priv = drm_file_alloc(minor);
     if (IS_ERR(priv))
         return PTR_ERR(priv);
 
     if (drm_is_primary_client(priv)) {
         ret = drm_master_open(priv);
         if (ret) {
             drm_file_free(priv);
             return ret;
         }
     }
 
     filp->private_data = priv;
     filp->f_mode |= FMODE_UNSIGNED_OFFSET;
     priv->filp = filp;
 
     mutex_lock(&dev->filelist_mutex);
     list_add(&priv->lhead, &dev->filelist);
     mutex_unlock(&dev->filelist_mutex);
 
 #ifdef CONFIG_DRM_LEGACY
 #ifdef __alpha__
     /*
      * Default the hose
      */
     if (!dev->hose) {
         struct pci_dev *pci_dev;
 
         pci_dev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, NULL);
         if (pci_dev) {
             dev->hose = pci_dev->sysdata;
             pci_dev_put(pci_dev);
         }
         if (!dev->hose) {
             struct pci_bus *b = list_entry(pci_root_buses.next,
                 struct pci_bus, node);
             if (b)
                 dev->hose = b->sysdata;
         }
     }
 #endif
 #endif
 
     return 0;
 }
 
 /**
  * drm_open - open method for DRM file
  * @inode: device inode
  * @filp: file pointer.
  *
  * This function must be used by drivers as their &file_operations.open method.
  * It looks up the correct DRM device and instantiates all the per-file
  * resources for it. It also calls the &drm_driver.open driver callback.
  *
  * RETURNS:
  *
  * 0 on success or negative errno value on failure.
  */
 int drm_open(struct inode *inode, struct file *filp)
 {
     struct drm_device *dev;
     struct drm_minor *minor;
     int retcode;
     int need_setup = 0;
 
     minor = drm_minor_acquire(iminor(inode));
     if (IS_ERR(minor))
         return PTR_ERR(minor);
 
     dev = minor->dev;
     if (drm_dev_needs_global_mutex(dev))
         mutex_lock(&drm_global_mutex);
 
     if (!atomic_fetch_inc(&dev->open_count))
         need_setup = 1;
 
     /* share address_space across all char-devs of a single device */
     filp->f_mapping = dev->anon_inode->i_mapping;
 
     retcode = drm_open_helper(filp, minor);
     if (retcode)
         goto err_undo;
     if (need_setup) {
         retcode = drm_legacy_setup(dev);
         if (retcode) {
             drm_close_helper(filp);
             goto err_undo;
         }
     }
 
     if (drm_dev_needs_global_mutex(dev))
         mutex_unlock(&drm_global_mutex);
 
     return 0;
 
 err_undo:
     atomic_dec(&dev->open_count);
     if (drm_dev_needs_global_mutex(dev))
         mutex_unlock(&drm_global_mutex);
     drm_minor_release(minor);
     return retcode;
 }
 EXPORT_SYMBOL(drm_open);
 
 void drm_lastclose(struct drm_device * dev)
 {
     DRM_DEBUG("\n");
 
     if (dev->driver->lastclose)
         dev->driver->lastclose(dev);
     DRM_DEBUG("driver lastclose completed\n");
 
     if (drm_core_check_feature(dev, DRIVER_LEGACY))
         drm_legacy_dev_reinit(dev);
 
     drm_client_dev_restore(dev);
 }
 
 /**
  * drm_release - release method for DRM file
  * @inode: device inode
  * @filp: file pointer.
  *
  * This function must be used by drivers as their &file_operations.release
  * method. It frees any resources associated with the open file, and calls the
  * &drm_driver.postclose driver callback. If this is the last open file for the
  * DRM device also proceeds to call the &drm_driver.lastclose driver callback.
  *
  * RETURNS:
  *
  * Always succeeds and returns 0.
  */
 int drm_release(struct inode *inode, struct file *filp)
 {
     struct drm_file *file_priv = filp->private_data;
     struct drm_minor *minor = file_priv->minor;
     struct drm_device *dev = minor->dev;
 
     if (drm_dev_needs_global_mutex(dev))
         mutex_lock(&drm_global_mutex);
 
     DRM_DEBUG("open_count = %d\n", atomic_read(&dev->open_count));
 
     drm_close_helper(filp);
 
     if (atomic_dec_and_test(&dev->open_count))
         drm_lastclose(dev);
 
     if (drm_dev_needs_global_mutex(dev))
         mutex_unlock(&drm_global_mutex);
 
     drm_minor_release(minor);
 
     return 0;
 }
 EXPORT_SYMBOL(drm_release);
 
 /**
  * drm_release_noglobal - release method for DRM file
  * @inode: device inode
  * @filp: file pointer.
  *
  * This function may be used by drivers as their &file_operations.release
  * method. It frees any resources associated with the open file prior to taking
  * the drm_global_mutex, which then calls the &drm_driver.postclose driver
  * callback. If this is the last open file for the DRM device also proceeds to
  * call the &drm_driver.lastclose driver callback.
  *
  * RETURNS:
  *
  * Always succeeds and returns 0.
  */
 int drm_release_noglobal(struct inode *inode, struct file *filp)
 {
     struct drm_file *file_priv = filp->private_data;
     struct drm_minor *minor = file_priv->minor;
     struct drm_device *dev = minor->dev;
 
     drm_close_helper(filp);
 
     if (atomic_dec_and_mutex_lock(&dev->open_count, &drm_global_mutex)) {
         drm_lastclose(dev);
         mutex_unlock(&drm_global_mutex);
     }
 
     drm_minor_release(minor);
 
     return 0;
 }
 EXPORT_SYMBOL(drm_release_noglobal);
 
 /**
  * drm_read - read method for DRM file
  * @filp: file pointer
  * @buffer: userspace destination pointer for the read
  * @count: count in bytes to read
  * @offset: offset to read
  *
  * This function must be used by drivers as their &file_operations.read
  * method if they use DRM events for asynchronous signalling to userspace.
  * Since events are used by the KMS API for vblank and page flip completion this
  * means all modern display drivers must use it.
  *
  * @offset is ignored, DRM events are read like a pipe. Polling support is
  * provided by drm_poll().
  *
  * This function will only ever read a full event. Therefore userspace must
  * supply a big enough buffer to fit any event to ensure forward progress. Since
  * the maximum event space is currently 4K it's recommended to just use that for
  * safety.
  *
  * RETURNS:
  *
  * Number of bytes read (always aligned to full events, and can be 0) or a
  * negative error code on failure.
  */
 ssize_t drm_read(struct file *filp, char __user *buffer,
          size_t count, loff_t *offset)
 {
     struct drm_file *file_priv = filp->private_data;
     struct drm_device *dev = file_priv->minor->dev;
     ssize_t ret;
 
     ret = mutex_lock_interruptible(&file_priv->event_read_lock);
     if (ret)
         return ret;
 
     for (;;) {
         struct drm_pending_event *e = NULL;
 
         spin_lock_irq(&dev->event_lock);
         if (!list_empty(&file_priv->event_list)) {
             e = list_first_entry(&file_priv->event_list,
                     struct drm_pending_event, link);
             file_priv->event_space += e->event->length;
             list_del(&e->link);
         }
         spin_unlock_irq(&dev->event_lock);
 
         if (e == NULL) {
             if (ret)
                 break;
 
             if (filp->f_flags & O_NONBLOCK) {
                 ret = -EAGAIN;
                 break;
             }
 
             mutex_unlock(&file_priv->event_read_lock);
             ret = wait_event_interruptible(file_priv->event_wait,
                                !list_empty(&file_priv->event_list));
             if (ret >= 0)
                 ret = mutex_lock_interruptible(&file_priv->event_read_lock);
             if (ret)
                 return ret;
         } else {
             unsigned length = e->event->length;
 
             if (length > count - ret) {
 put_back_event:
                 spin_lock_irq(&dev->event_lock);
                 file_priv->event_space -= length;
                 list_add(&e->link, &file_priv->event_list);
                 spin_unlock_irq(&dev->event_lock);
                 wake_up_interruptible_poll(&file_priv->event_wait,
                     EPOLLIN | EPOLLRDNORM);
                 break;
             }
 
             if (copy_to_user(buffer + ret, e->event, length)) {
                 if (ret == 0)
                     ret = -EFAULT;
                 goto put_back_event;
             }
 
             ret += length;
             kfree(e);
         }
     }
     mutex_unlock(&file_priv->event_read_lock);
 
     return ret;
 }
 EXPORT_SYMBOL(drm_read);
 
 /**
  * drm_poll - poll method for DRM file
  * @filp: file pointer
  * @wait: poll waiter table
  *
  * This function must be used by drivers as their &file_operations.read method
  * if they use DRM events for asynchronous signalling to userspace.  Since
  * events are used by the KMS API for vblank and page flip completion this means
  * all modern display drivers must use it.
  *
  * See also drm_read().
  *
  * RETURNS:
  *
  * Mask of POLL flags indicating the current status of the file.
  */
 __poll_t drm_poll(struct file *filp, struct poll_table_struct *wait)
 {
     struct drm_file *file_priv = filp->private_data;
     __poll_t mask = 0;
 
     poll_wait(filp, &file_priv->event_wait, wait);
 
     if (!list_empty(&file_priv->event_list))
         mask |= EPOLLIN | EPOLLRDNORM;
 
     return mask;
 }
 EXPORT_SYMBOL(drm_poll);
 
 /**
  * drm_event_reserve_init_locked - init a DRM event and reserve space for it
  * @dev: DRM device
  * @file_priv: DRM file private data
  * @p: tracking structure for the pending event
  * @e: actual event data to deliver to userspace
  *
  * This function prepares the passed in event for eventual delivery. If the event
  * doesn't get delivered (because the IOCTL fails later on, before queuing up
  * anything) then the even must be cancelled and freed using
  * drm_event_cancel_free(). Successfully initialized events should be sent out
  * using drm_send_event() or drm_send_event_locked() to signal completion of the
  * asynchronous event to userspace.
  *
  * If callers embedded @p into a larger structure it must be allocated with
  * kmalloc and @p must be the first member element.
  *
  * This is the locked version of drm_event_reserve_init() for callers which
  * already hold &drm_device.event_lock.
  *
  * RETURNS:
  *
  * 0 on success or a negative error code on failure.
  */
 int drm_event_reserve_init_locked(struct drm_device *dev,
                   struct drm_file *file_priv,
                   struct drm_pending_event *p,
                   struct drm_event *e)
 {
     if (file_priv->event_space < e->length)
         return -ENOMEM;
 
     file_priv->event_space -= e->length;
 
     p->event = e;
     list_add(&p->pending_link, &file_priv->pending_event_list);
     p->file_priv = file_priv;
 
     return 0;
 }
 EXPORT_SYMBOL(drm_event_reserve_init_locked);
 
 /**
  * drm_event_reserve_init - init a DRM event and reserve space for it
  * @dev: DRM device
  * @file_priv: DRM file private data
  * @p: tracking structure for the pending event
  * @e: actual event data to deliver to userspace
  *
  * This function prepares the passed in event for eventual delivery. If the event
  * doesn't get delivered (because the IOCTL fails later on, before queuing up
  * anything) then the even must be cancelled and freed using
  * drm_event_cancel_free(). Successfully initialized events should be sent out
  * using drm_send_event() or drm_send_event_locked() to signal completion of the
  * asynchronous event to userspace.
  *
  * If callers embedded @p into a larger structure it must be allocated with
  * kmalloc and @p must be the first member element.
  *
  * Callers which already hold &drm_device.event_lock should use
  * drm_event_reserve_init_locked() instead.
  *
  * RETURNS:
  *
  * 0 on success or a negative error code on failure.
  */
 int drm_event_reserve_init(struct drm_device *dev,
                struct drm_file *file_priv,
                struct drm_pending_event *p,
                struct drm_event *e)
 {
     unsigned long flags;
     int ret;
 
     spin_lock_irqsave(&dev->event_lock, flags);
     ret = drm_event_reserve_init_locked(dev, file_priv, p, e);
     spin_unlock_irqrestore(&dev->event_lock, flags);
 
     return ret;
 }
 EXPORT_SYMBOL(drm_event_reserve_init);
 
 /**
  * drm_event_cancel_free - free a DRM event and release its space
  * @dev: DRM device
  * @p: tracking structure for the pending event
  *
  * This function frees the event @p initialized with drm_event_reserve_init()
  * and releases any allocated space. It is used to cancel an event when the
  * nonblocking operation could not be submitted and needed to be aborted.
  */
 void drm_event_cancel_free(struct drm_device *dev,
                struct drm_pending_event *p)
 {
     unsigned long flags;
 
     spin_lock_irqsave(&dev->event_lock, flags);
     if (p->file_priv) {
         p->file_priv->event_space += p->event->length;
         list_del(&p->pending_link);
     }
     spin_unlock_irqrestore(&dev->event_lock, flags);
 
     if (p->fence)
         dma_fence_put(p->fence);
 
     kfree(p);
 }
 EXPORT_SYMBOL(drm_event_cancel_free);
 
 static void drm_send_event_helper(struct drm_device *dev,
                struct drm_pending_event *e, ktime_t timestamp)
 {
     assert_spin_locked(&dev->event_lock);
 
     if (e->completion) {
         complete_all(e->completion);
         e->completion_release(e->completion);
         e->completion = NULL;
     }
 
     if (e->fence) {
         if (timestamp)
             dma_fence_signal_timestamp(e->fence, timestamp);
         else
             dma_fence_signal(e->fence);
         dma_fence_put(e->fence);
     }
 
     if (!e->file_priv) {
         kfree(e);
         return;
     }
 
     list_del(&e->pending_link);
     list_add_tail(&e->link,
               &e->file_priv->event_list);
     wake_up_interruptible_poll(&e->file_priv->event_wait,
         EPOLLIN | EPOLLRDNORM);
 }
 
 /**
  * drm_send_event_timestamp_locked - send DRM event to file descriptor
  * @dev: DRM device
  * @e: DRM event to deliver
  * @timestamp: timestamp to set for the fence event in kernel's CLOCK_MONOTONIC
  * time domain
  *
  * This function sends the event @e, initialized with drm_event_reserve_init(),
  * to its associated userspace DRM file. Callers must already hold
  * &drm_device.event_lock.
  *
  * Note that the core will take care of unlinking and disarming events when the
  * corresponding DRM file is closed. Drivers need not worry about whether the
  * DRM file for this event still exists and can call this function upon
  * completion of the asynchronous work unconditionally.
  */
 void drm_send_event_timestamp_locked(struct drm_device *dev,
                      struct drm_pending_event *e, ktime_t timestamp)
 {
     drm_send_event_helper(dev, e, timestamp);
 }
 EXPORT_SYMBOL(drm_send_event_timestamp_locked);
 
 /**
  * drm_send_event_locked - send DRM event to file descriptor
  * @dev: DRM device
  * @e: DRM event to deliver
  *
  * This function sends the event @e, initialized with drm_event_reserve_init(),
  * to its associated userspace DRM file. Callers must already hold
  * &drm_device.event_lock, see drm_send_event() for the unlocked version.
  *
  * Note that the core will take care of unlinking and disarming events when the
  * corresponding DRM file is closed. Drivers need not worry about whether the
  * DRM file for this event still exists and can call this function upon
  * completion of the asynchronous work unconditionally.
  */
 void drm_send_event_locked(struct drm_device *dev, struct drm_pending_event *e)
 {
     drm_send_event_helper(dev, e, 0);
 }
 EXPORT_SYMBOL(drm_send_event_locked);
 
 /**
  * drm_send_event - send DRM event to file descriptor
  * @dev: DRM device
  * @e: DRM event to deliver
  *
  * This function sends the event @e, initialized with drm_event_reserve_init(),
  * to its associated userspace DRM file. This function acquires
  * &drm_device.event_lock, see drm_send_event_locked() for callers which already
  * hold this lock.
  *
  * Note that the core will take care of unlinking and disarming events when the
  * corresponding DRM file is closed. Drivers need not worry about whether the
  * DRM file for this event still exists and can call this function upon
  * completion of the asynchronous work unconditionally.
  */
 void drm_send_event(struct drm_device *dev, struct drm_pending_event *e)
 {
     unsigned long irqflags;
 
     spin_lock_irqsave(&dev->event_lock, irqflags);
     drm_send_event_helper(dev, e, 0);
     spin_unlock_irqrestore(&dev->event_lock, irqflags);
 }
 EXPORT_SYMBOL(drm_send_event);
 
 /**
  * mock_drm_getfile - Create a new struct file for the drm device
  * @minor: drm minor to wrap (e.g. #drm_device.primary)
  * @flags: file creation mode (O_RDWR etc)
  *
  * This create a new struct file that wraps a DRM file context around a
  * DRM minor. This mimicks userspace opening e.g. /dev/dri/card0, but without
  * invoking userspace. The struct file may be operated on using its f_op
  * (the drm_device.driver.fops) to mimick userspace operations, or be supplied
  * to userspace facing functions as an internal/anonymous client.
  *
  * RETURNS:
  * Pointer to newly created struct file, ERR_PTR on failure.
  */
 struct file *mock_drm_getfile(struct drm_minor *minor, unsigned int flags)
 {
     struct drm_device *dev = minor->dev;
     struct drm_file *priv;
     struct file *file;
 
     priv = drm_file_alloc(minor);
     if (IS_ERR(priv))
         return ERR_CAST(priv);
 
     file = anon_inode_getfile("drm", dev->driver->fops, priv, flags);
     if (IS_ERR(file)) {
         drm_file_free(priv);
         return file;
     }
 
     /* Everyone shares a single global address space */
     file->f_mapping = dev->anon_inode->i_mapping;
 
     drm_dev_get(dev);
     priv->filp = file;
 
     return file;
 }
 EXPORT_SYMBOL_FOR_TESTS_ONLY(mock_drm_getfile);
 
 #ifdef CONFIG_MMU
 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
 /*
  * drm_addr_inflate() attempts to construct an aligned area by inflating
  * the area size and skipping the unaligned start of the area.
  * adapted from shmem_get_unmapped_area()
  */
 static unsigned long drm_addr_inflate(unsigned long addr,
                       unsigned long len,
                       unsigned long pgoff,
                       unsigned long flags,
                       unsigned long huge_size)
 {
     unsigned long offset, inflated_len;
     unsigned long inflated_addr;
     unsigned long inflated_offset;
 
     offset = (pgoff << PAGE_SHIFT) & (huge_size - 1);
     if (offset && offset + len < 2 * huge_size)
         return addr;
     if ((addr & (huge_size - 1)) == offset)
         return addr;
 
     inflated_len = len + huge_size - PAGE_SIZE;
     if (inflated_len > TASK_SIZE)
         return addr;
     if (inflated_len < len)
         return addr;
 
     inflated_addr = current->mm->get_unmapped_area(NULL, 0, inflated_len,
                                0, flags);
     if (IS_ERR_VALUE(inflated_addr))
         return addr;
     if (inflated_addr & ~PAGE_MASK)
         return addr;
 
     inflated_offset = inflated_addr & (huge_size - 1);
     inflated_addr += offset - inflated_offset;
     if (inflated_offset > offset)
         inflated_addr += huge_size;
 
     if (inflated_addr > TASK_SIZE - len)
         return addr;
 
     return inflated_addr;
 }
 
 /**
  * drm_get_unmapped_area() - Get an unused user-space virtual memory area
  * suitable for huge page table entries.
  * @file: The struct file representing the address space being mmap()'d.
  * @uaddr: Start address suggested by user-space.
  * @len: Length of the area.
  * @pgoff: The page offset into the address space.
  * @flags: mmap flags
  * @mgr: The address space manager used by the drm driver. This argument can
  * probably be removed at some point when all drivers use the same
  * address space manager.
  *
  * This function attempts to find an unused user-space virtual memory area
  * that can accommodate the size we want to map, and that is properly
  * aligned to facilitate huge page table entries matching actual
  * huge pages or huge page aligned memory in buffer objects. Buffer objects
  * are assumed to start at huge page boundary pfns (io memory) or be
  * populated by huge pages aligned to the start of the buffer object
  * (system- or coherent memory). Adapted from shmem_get_unmapped_area.
  *
  * Return: aligned user-space address.
  */
 unsigned long drm_get_unmapped_area(struct file *file,
                     unsigned long uaddr, unsigned long len,
                     unsigned long pgoff, unsigned long flags,
                     struct drm_vma_offset_manager *mgr)
 {
     unsigned long addr;
     unsigned long inflated_addr;
     struct drm_vma_offset_node *node;
 
     if (len > TASK_SIZE)
         return -ENOMEM;
 
     /*
      * @pgoff is the file page-offset the huge page boundaries of
      * which typically aligns to physical address huge page boundaries.
      * That's not true for DRM, however, where physical address huge
      * page boundaries instead are aligned with the offset from
      * buffer object start. So adjust @pgoff to be the offset from
      * buffer object start.
      */
     drm_vma_offset_lock_lookup(mgr);
     node = drm_vma_offset_lookup_locked(mgr, pgoff, 1);
     if (node)
         pgoff -= node->vm_node.start;
     drm_vma_offset_unlock_lookup(mgr);
 
     addr = current->mm->get_unmapped_area(file, uaddr, len, pgoff, flags);
     if (IS_ERR_VALUE(addr))
         return addr;
     if (addr & ~PAGE_MASK)
         return addr;
     if (addr > TASK_SIZE - len)
         return addr;
 
     if (len < HPAGE_PMD_SIZE)
         return addr;
     if (flags & MAP_FIXED)
         return addr;
     /*
      * Our priority is to support MAP_SHARED mapped hugely;
      * and support MAP_PRIVATE mapped hugely too, until it is COWed.
      * But if caller specified an address hint, respect that as before.
      */
     if (uaddr)
         return addr;
 
     inflated_addr = drm_addr_inflate(addr, len, pgoff, flags,
                      HPAGE_PMD_SIZE);
 
     if (IS_ENABLED(CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD) &&
         len >= HPAGE_PUD_SIZE)
         inflated_addr = drm_addr_inflate(inflated_addr, len, pgoff,
                          flags, HPAGE_PUD_SIZE);
     return inflated_addr;
 }
 #else /* CONFIG_TRANSPARENT_HUGEPAGE */
 unsigned long drm_get_unmapped_area(struct file *file,
                     unsigned long uaddr, unsigned long len,
                     unsigned long pgoff, unsigned long flags,
                     struct drm_vma_offset_manager *mgr)
 {
     return current->mm->get_unmapped_area(file, uaddr, len, pgoff, flags);
 }
 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
 EXPORT_SYMBOL_GPL(drm_get_unmapped_area);
 #endif /* CONFIG_MMU */

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