v4.19.13 snapshot.
diff --git a/drivers/gpu/drm/drm_file.c b/drivers/gpu/drm/drm_file.c
new file mode 100644
index 0000000..ffa8dc3
--- /dev/null
+++ b/drivers/gpu/drm/drm_file.c
@@ -0,0 +1,794 @@
+/*
+ * \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/poll.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+
+#include <drm/drm_client.h>
+#include <drm/drm_file.h>
+#include <drm/drmP.h>
+
+#include "drm_legacy.h"
+#include "drm_internal.h"
+#include "drm_crtc_internal.h"
+
+/* from BKL pushdown */
+DEFINE_MUTEX(drm_global_mutex);
+
+/**
+ * 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(), and
+ * for drivers which use the CMA GEM helpers it's drm_gem_cma_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>`.
+ */
+
+static int drm_open_helper(struct file *filp, struct drm_minor *minor);
+
+/**
+ * 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);
+ file->lock_count = 0;
+
+ 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 */
+
+ 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);
+
+ if (drm_core_check_feature(dev, DRIVER_PRIME))
+ 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:
+ if (drm_core_check_feature(dev, DRIVER_PRIME))
+ 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.
+ *
+ * RETURNS:
+ * 0 on success, or error code on failure.
+ */
+void drm_file_free(struct drm_file *file)
+{
+ struct drm_device *dev;
+
+ if (!file)
+ return;
+
+ dev = file->minor->dev;
+
+ DRM_DEBUG("pid = %d, device = 0x%lx, open_count = %d\n",
+ task_pid_nr(current),
+ (long)old_encode_dev(file->minor->kdev->devt),
+ dev->open_count);
+
+ if (drm_core_check_feature(dev, DRIVER_LEGACY) &&
+ dev->driver->preclose)
+ dev->driver->preclose(dev, file);
+
+ 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);
+
+ if (drm_core_check_feature(dev, DRIVER_PRIME))
+ drm_prime_destroy_file_private(&file->prime);
+
+ WARN_ON(!list_empty(&file->event_list));
+
+ put_pid(file->pid);
+ kfree(file);
+}
+
+static int drm_setup(struct drm_device * dev)
+{
+ int ret;
+
+ if (dev->driver->firstopen &&
+ drm_core_check_feature(dev, DRIVER_LEGACY)) {
+ ret = dev->driver->firstopen(dev);
+ if (ret != 0)
+ return ret;
+ }
+
+ ret = drm_legacy_dma_setup(dev);
+ if (ret < 0)
+ return ret;
+
+
+ DRM_DEBUG("\n");
+ 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 falure.
+ */
+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 (!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_setup(dev);
+ if (retcode)
+ goto err_undo;
+ }
+ return 0;
+
+err_undo:
+ dev->open_count--;
+ drm_minor_release(minor);
+ return retcode;
+}
+EXPORT_SYMBOL(drm_open);
+
+/*
+ * 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 /dev/drm.
+ *
+ * \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("pid = %d, minor = %d\n", 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 __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
+
+ return 0;
+}
+
+static void drm_legacy_dev_reinit(struct drm_device *dev)
+{
+ if (dev->irq_enabled)
+ drm_irq_uninstall(dev);
+
+ mutex_lock(&dev->struct_mutex);
+
+ drm_legacy_agp_clear(dev);
+
+ drm_legacy_sg_cleanup(dev);
+ drm_legacy_vma_flush(dev);
+ drm_legacy_dma_takedown(dev);
+
+ mutex_unlock(&dev->struct_mutex);
+
+ dev->sigdata.lock = NULL;
+
+ dev->context_flag = 0;
+ dev->last_context = 0;
+ dev->if_version = 0;
+
+ DRM_DEBUG("lastclose completed\n");
+}
+
+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;
+
+ mutex_lock(&drm_global_mutex);
+
+ DRM_DEBUG("open_count = %d\n", dev->open_count);
+
+ mutex_lock(&dev->filelist_mutex);
+ list_del(&file_priv->lhead);
+ mutex_unlock(&dev->filelist_mutex);
+
+ drm_file_free(file_priv);
+
+ if (!--dev->open_count) {
+ drm_lastclose(dev);
+ if (drm_dev_is_unplugged(dev))
+ drm_put_dev(dev);
+ }
+ mutex_unlock(&drm_global_mutex);
+
+ drm_minor_release(minor);
+
+ return 0;
+}
+EXPORT_SYMBOL(drm_release);
+
+/**
+ * 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 iff 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. Therefore drivers also
+ * must set the &file_operation.llseek to no_llseek(). 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;
+
+ if (!access_ok(VERIFY_WRITE, buffer, count))
+ return -EFAULT;
+
+ 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);
+ 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
+ * iff 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 it's 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);
+
+/**
+ * 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)
+{
+ assert_spin_locked(&dev->event_lock);
+
+ if (e->completion) {
+ complete_all(e->completion);
+ e->completion_release(e->completion);
+ e->completion = NULL;
+ }
+
+ if (e->fence) {
+ 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(&e->file_priv->event_wait);
+}
+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_locked(dev, e);
+ spin_unlock_irqrestore(&dev->event_lock, irqflags);
+}
+EXPORT_SYMBOL(drm_send_event);