| /* |
| * \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_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); |
| |
| 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 = kzalloc(sizeof(*priv), GFP_KERNEL); |
| if (!priv) |
| return -ENOMEM; |
| |
| filp->private_data = priv; |
| priv->filp = filp; |
| priv->pid = get_pid(task_pid(current)); |
| priv->minor = minor; |
| |
| /* for compatibility root is always authenticated */ |
| priv->authenticated = capable(CAP_SYS_ADMIN); |
| priv->lock_count = 0; |
| |
| INIT_LIST_HEAD(&priv->lhead); |
| INIT_LIST_HEAD(&priv->fbs); |
| mutex_init(&priv->fbs_lock); |
| INIT_LIST_HEAD(&priv->blobs); |
| INIT_LIST_HEAD(&priv->pending_event_list); |
| INIT_LIST_HEAD(&priv->event_list); |
| init_waitqueue_head(&priv->event_wait); |
| priv->event_space = 4096; /* set aside 4k for event buffer */ |
| |
| mutex_init(&priv->event_read_lock); |
| |
| if (drm_core_check_feature(dev, DRIVER_GEM)) |
| drm_gem_open(dev, priv); |
| |
| if (drm_core_check_feature(dev, DRIVER_SYNCOBJ)) |
| drm_syncobj_open(priv); |
| |
| if (drm_core_check_feature(dev, DRIVER_PRIME)) |
| drm_prime_init_file_private(&priv->prime); |
| |
| if (dev->driver->open) { |
| ret = dev->driver->open(dev, priv); |
| if (ret < 0) |
| goto out_prime_destroy; |
| } |
| |
| if (drm_is_primary_client(priv)) { |
| ret = drm_master_open(priv); |
| if (ret) |
| goto out_close; |
| } |
| |
| 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; |
| |
| out_close: |
| if (dev->driver->postclose) |
| dev->driver->postclose(dev, priv); |
| out_prime_destroy: |
| if (drm_core_check_feature(dev, DRIVER_PRIME)) |
| drm_prime_destroy_file_private(&priv->prime); |
| if (drm_core_check_feature(dev, DRIVER_SYNCOBJ)) |
| drm_syncobj_release(priv); |
| if (drm_core_check_feature(dev, DRIVER_GEM)) |
| drm_gem_release(dev, priv); |
| put_pid(priv->pid); |
| kfree(priv); |
| filp->private_data = NULL; |
| return 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); |
| } |
| |
| 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_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); |
| |
| if (drm_core_check_feature(dev, DRIVER_LEGACY) && |
| dev->driver->preclose) |
| dev->driver->preclose(dev, file_priv); |
| |
| /* ======================================================== |
| * Begin inline drm_release |
| */ |
| |
| DRM_DEBUG("pid = %d, device = 0x%lx, open_count = %d\n", |
| task_pid_nr(current), |
| (long)old_encode_dev(file_priv->minor->kdev->devt), |
| dev->open_count); |
| |
| if (drm_core_check_feature(dev, DRIVER_LEGACY)) |
| drm_legacy_lock_release(dev, filp); |
| |
| if (drm_core_check_feature(dev, DRIVER_HAVE_DMA)) |
| drm_legacy_reclaim_buffers(dev, file_priv); |
| |
| drm_events_release(file_priv); |
| |
| if (drm_core_check_feature(dev, DRIVER_MODESET)) { |
| drm_fb_release(file_priv); |
| drm_property_destroy_user_blobs(dev, file_priv); |
| } |
| |
| if (drm_core_check_feature(dev, DRIVER_SYNCOBJ)) |
| drm_syncobj_release(file_priv); |
| |
| if (drm_core_check_feature(dev, DRIVER_GEM)) |
| drm_gem_release(dev, file_priv); |
| |
| drm_legacy_ctxbitmap_flush(dev, file_priv); |
| |
| if (drm_is_primary_client(file_priv)) |
| drm_master_release(file_priv); |
| |
| if (dev->driver->postclose) |
| dev->driver->postclose(dev, file_priv); |
| |
| if (drm_core_check_feature(dev, DRIVER_PRIME)) |
| drm_prime_destroy_file_private(&file_priv->prime); |
| |
| WARN_ON(!list_empty(&file_priv->event_list)); |
| |
| put_pid(file_priv->pid); |
| kfree(file_priv); |
| |
| /* ======================================================== |
| * End inline drm_release |
| */ |
| |
| 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); |