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![Noralf Trønnes](/assets/img/avatar_default.png)
This the beginning of an API for in-kernel clients. First out is a way to get a framebuffer backed by a dumb buffer. Only GEM drivers are supported. The original idea of using an exported dma-buf was dropped because it also creates an anonomous file descriptor which doesn't work when the buffer is created from a kernel thread. The easy way out is to use drm_driver.gem_prime_vmap to get the virtual address, which requires a GEM object. This excludes the vmwgfx driver which is the only non-GEM driver apart from the legacy ones. A solution for vmwgfx will have to be worked out later if it wants to support the client API which it probably will when we have a bootsplash client. Suggested-by: Daniel Vetter <daniel.vetter@ffwll.ch> Signed-off-by: Noralf Trønnes <noralf@tronnes.org> Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: https://patchwork.freedesktop.org/patch/msgid/20180703160354.59955-2-noralf@tronnes.org
794 lines
22 KiB
C
794 lines
22 KiB
C
/*
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* \author Rickard E. (Rik) Faith <faith@valinux.com>
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* \author Daryll Strauss <daryll@valinux.com>
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* \author Gareth Hughes <gareth@valinux.com>
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*/
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/*
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* Created: Mon Jan 4 08:58:31 1999 by faith@valinux.com
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*
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* Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
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* Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <linux/poll.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <drm/drm_client.h>
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#include <drm/drm_file.h>
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#include <drm/drmP.h>
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#include "drm_legacy.h"
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#include "drm_internal.h"
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#include "drm_crtc_internal.h"
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/* from BKL pushdown */
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DEFINE_MUTEX(drm_global_mutex);
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/**
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* DOC: file operations
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*
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* Drivers must define the file operations structure that forms the DRM
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* userspace API entry point, even though most of those operations are
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* implemented in the DRM core. The resulting &struct file_operations must be
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* stored in the &drm_driver.fops field. The mandatory functions are drm_open(),
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* drm_read(), drm_ioctl() and drm_compat_ioctl() if CONFIG_COMPAT is enabled
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* Note that drm_compat_ioctl will be NULL if CONFIG_COMPAT=n, so there's no
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* need to sprinkle #ifdef into the code. Drivers which implement private ioctls
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* that require 32/64 bit compatibility support must provide their own
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* &file_operations.compat_ioctl handler that processes private ioctls and calls
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* drm_compat_ioctl() for core ioctls.
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*
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* In addition drm_read() and drm_poll() provide support for DRM events. DRM
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* events are a generic and extensible means to send asynchronous events to
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* userspace through the file descriptor. They are used to send vblank event and
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* page flip completions by the KMS API. But drivers can also use it for their
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* own needs, e.g. to signal completion of rendering.
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*
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* For the driver-side event interface see drm_event_reserve_init() and
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* drm_send_event() as the main starting points.
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*
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* The memory mapping implementation will vary depending on how the driver
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* manages memory. Legacy drivers will use the deprecated drm_legacy_mmap()
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* function, modern drivers should use one of the provided memory-manager
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* specific implementations. For GEM-based drivers this is drm_gem_mmap(), and
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* for drivers which use the CMA GEM helpers it's drm_gem_cma_mmap().
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*
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* No other file operations are supported by the DRM userspace API. Overall the
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* following is an example &file_operations structure::
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*
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* static const example_drm_fops = {
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* .owner = THIS_MODULE,
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* .open = drm_open,
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* .release = drm_release,
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* .unlocked_ioctl = drm_ioctl,
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* .compat_ioctl = drm_compat_ioctl, // NULL if CONFIG_COMPAT=n
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* .poll = drm_poll,
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* .read = drm_read,
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* .llseek = no_llseek,
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* .mmap = drm_gem_mmap,
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* };
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*
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* For plain GEM based drivers there is the DEFINE_DRM_GEM_FOPS() macro, and for
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* CMA based drivers there is the DEFINE_DRM_GEM_CMA_FOPS() macro to make this
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* simpler.
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*
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* The driver's &file_operations must be stored in &drm_driver.fops.
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*
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* For driver-private IOCTL handling see the more detailed discussion in
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* :ref:`IOCTL support in the userland interfaces chapter<drm_driver_ioctl>`.
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*/
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static int drm_open_helper(struct file *filp, struct drm_minor *minor);
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/**
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* drm_file_alloc - allocate file context
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* @minor: minor to allocate on
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*
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* This allocates a new DRM file context. It is not linked into any context and
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* can be used by the caller freely. Note that the context keeps a pointer to
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* @minor, so it must be freed before @minor is.
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*
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* RETURNS:
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* Pointer to newly allocated context, ERR_PTR on failure.
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*/
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struct drm_file *drm_file_alloc(struct drm_minor *minor)
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{
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struct drm_device *dev = minor->dev;
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struct drm_file *file;
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int ret;
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file = kzalloc(sizeof(*file), GFP_KERNEL);
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if (!file)
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return ERR_PTR(-ENOMEM);
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file->pid = get_pid(task_pid(current));
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file->minor = minor;
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/* for compatibility root is always authenticated */
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file->authenticated = capable(CAP_SYS_ADMIN);
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file->lock_count = 0;
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INIT_LIST_HEAD(&file->lhead);
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INIT_LIST_HEAD(&file->fbs);
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mutex_init(&file->fbs_lock);
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INIT_LIST_HEAD(&file->blobs);
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INIT_LIST_HEAD(&file->pending_event_list);
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INIT_LIST_HEAD(&file->event_list);
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init_waitqueue_head(&file->event_wait);
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file->event_space = 4096; /* set aside 4k for event buffer */
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mutex_init(&file->event_read_lock);
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if (drm_core_check_feature(dev, DRIVER_GEM))
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drm_gem_open(dev, file);
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if (drm_core_check_feature(dev, DRIVER_SYNCOBJ))
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drm_syncobj_open(file);
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if (drm_core_check_feature(dev, DRIVER_PRIME))
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drm_prime_init_file_private(&file->prime);
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if (dev->driver->open) {
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ret = dev->driver->open(dev, file);
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if (ret < 0)
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goto out_prime_destroy;
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}
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return file;
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out_prime_destroy:
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if (drm_core_check_feature(dev, DRIVER_PRIME))
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drm_prime_destroy_file_private(&file->prime);
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if (drm_core_check_feature(dev, DRIVER_SYNCOBJ))
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drm_syncobj_release(file);
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if (drm_core_check_feature(dev, DRIVER_GEM))
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drm_gem_release(dev, file);
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put_pid(file->pid);
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kfree(file);
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return ERR_PTR(ret);
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}
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static void drm_events_release(struct drm_file *file_priv)
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{
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struct drm_device *dev = file_priv->minor->dev;
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struct drm_pending_event *e, *et;
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unsigned long flags;
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spin_lock_irqsave(&dev->event_lock, flags);
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/* Unlink pending events */
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list_for_each_entry_safe(e, et, &file_priv->pending_event_list,
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pending_link) {
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list_del(&e->pending_link);
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e->file_priv = NULL;
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}
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/* Remove unconsumed events */
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list_for_each_entry_safe(e, et, &file_priv->event_list, link) {
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list_del(&e->link);
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kfree(e);
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}
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spin_unlock_irqrestore(&dev->event_lock, flags);
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}
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/**
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* drm_file_free - free file context
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* @file: context to free, or NULL
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*
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* This destroys and deallocates a DRM file context previously allocated via
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* drm_file_alloc(). The caller must make sure to unlink it from any contexts
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* before calling this.
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*
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* If NULL is passed, this is a no-op.
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*
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* RETURNS:
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* 0 on success, or error code on failure.
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*/
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void drm_file_free(struct drm_file *file)
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{
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struct drm_device *dev;
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if (!file)
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return;
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dev = file->minor->dev;
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DRM_DEBUG("pid = %d, device = 0x%lx, open_count = %d\n",
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task_pid_nr(current),
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(long)old_encode_dev(file->minor->kdev->devt),
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dev->open_count);
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if (drm_core_check_feature(dev, DRIVER_LEGACY) &&
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dev->driver->preclose)
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dev->driver->preclose(dev, file);
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if (drm_core_check_feature(dev, DRIVER_LEGACY))
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drm_legacy_lock_release(dev, file->filp);
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if (drm_core_check_feature(dev, DRIVER_HAVE_DMA))
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drm_legacy_reclaim_buffers(dev, file);
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drm_events_release(file);
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if (drm_core_check_feature(dev, DRIVER_MODESET)) {
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drm_fb_release(file);
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drm_property_destroy_user_blobs(dev, file);
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}
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if (drm_core_check_feature(dev, DRIVER_SYNCOBJ))
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drm_syncobj_release(file);
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if (drm_core_check_feature(dev, DRIVER_GEM))
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drm_gem_release(dev, file);
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drm_legacy_ctxbitmap_flush(dev, file);
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if (drm_is_primary_client(file))
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drm_master_release(file);
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if (dev->driver->postclose)
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dev->driver->postclose(dev, file);
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if (drm_core_check_feature(dev, DRIVER_PRIME))
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drm_prime_destroy_file_private(&file->prime);
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WARN_ON(!list_empty(&file->event_list));
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put_pid(file->pid);
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kfree(file);
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}
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static int drm_setup(struct drm_device * dev)
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{
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int ret;
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if (dev->driver->firstopen &&
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drm_core_check_feature(dev, DRIVER_LEGACY)) {
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ret = dev->driver->firstopen(dev);
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if (ret != 0)
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return ret;
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}
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ret = drm_legacy_dma_setup(dev);
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if (ret < 0)
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return ret;
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DRM_DEBUG("\n");
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return 0;
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}
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/**
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* drm_open - open method for DRM file
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* @inode: device inode
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* @filp: file pointer.
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*
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* This function must be used by drivers as their &file_operations.open method.
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* It looks up the correct DRM device and instantiates all the per-file
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* resources for it. It also calls the &drm_driver.open driver callback.
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*
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* RETURNS:
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*
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* 0 on success or negative errno value on falure.
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*/
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int drm_open(struct inode *inode, struct file *filp)
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{
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struct drm_device *dev;
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struct drm_minor *minor;
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int retcode;
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int need_setup = 0;
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minor = drm_minor_acquire(iminor(inode));
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if (IS_ERR(minor))
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return PTR_ERR(minor);
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dev = minor->dev;
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if (!dev->open_count++)
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need_setup = 1;
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/* share address_space across all char-devs of a single device */
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filp->f_mapping = dev->anon_inode->i_mapping;
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retcode = drm_open_helper(filp, minor);
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if (retcode)
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goto err_undo;
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if (need_setup) {
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retcode = drm_setup(dev);
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if (retcode)
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goto err_undo;
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}
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return 0;
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err_undo:
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dev->open_count--;
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drm_minor_release(minor);
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return retcode;
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}
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EXPORT_SYMBOL(drm_open);
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/*
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* Check whether DRI will run on this CPU.
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*
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* \return non-zero if the DRI will run on this CPU, or zero otherwise.
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*/
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static int drm_cpu_valid(void)
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{
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#if defined(__sparc__) && !defined(__sparc_v9__)
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return 0; /* No cmpxchg before v9 sparc. */
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#endif
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return 1;
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}
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/*
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* Called whenever a process opens /dev/drm.
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*
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* \param filp file pointer.
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* \param minor acquired minor-object.
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* \return zero on success or a negative number on failure.
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*
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* Creates and initializes a drm_file structure for the file private data in \p
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* filp and add it into the double linked list in \p dev.
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*/
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static int drm_open_helper(struct file *filp, struct drm_minor *minor)
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{
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struct drm_device *dev = minor->dev;
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struct drm_file *priv;
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int ret;
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if (filp->f_flags & O_EXCL)
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return -EBUSY; /* No exclusive opens */
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if (!drm_cpu_valid())
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return -EINVAL;
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if (dev->switch_power_state != DRM_SWITCH_POWER_ON && dev->switch_power_state != DRM_SWITCH_POWER_DYNAMIC_OFF)
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return -EINVAL;
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DRM_DEBUG("pid = %d, minor = %d\n", task_pid_nr(current), minor->index);
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priv = drm_file_alloc(minor);
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if (IS_ERR(priv))
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return PTR_ERR(priv);
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if (drm_is_primary_client(priv)) {
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ret = drm_master_open(priv);
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if (ret) {
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drm_file_free(priv);
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return ret;
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}
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}
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filp->private_data = priv;
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filp->f_mode |= FMODE_UNSIGNED_OFFSET;
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priv->filp = filp;
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mutex_lock(&dev->filelist_mutex);
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list_add(&priv->lhead, &dev->filelist);
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mutex_unlock(&dev->filelist_mutex);
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#ifdef __alpha__
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/*
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* Default the hose
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*/
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if (!dev->hose) {
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struct pci_dev *pci_dev;
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pci_dev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, NULL);
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if (pci_dev) {
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dev->hose = pci_dev->sysdata;
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pci_dev_put(pci_dev);
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}
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if (!dev->hose) {
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struct pci_bus *b = list_entry(pci_root_buses.next,
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struct pci_bus, node);
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if (b)
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dev->hose = b->sysdata;
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}
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}
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#endif
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return 0;
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}
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static void drm_legacy_dev_reinit(struct drm_device *dev)
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{
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if (dev->irq_enabled)
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drm_irq_uninstall(dev);
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mutex_lock(&dev->struct_mutex);
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drm_legacy_agp_clear(dev);
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drm_legacy_sg_cleanup(dev);
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drm_legacy_vma_flush(dev);
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drm_legacy_dma_takedown(dev);
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mutex_unlock(&dev->struct_mutex);
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dev->sigdata.lock = NULL;
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dev->context_flag = 0;
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dev->last_context = 0;
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dev->if_version = 0;
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DRM_DEBUG("lastclose completed\n");
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}
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void drm_lastclose(struct drm_device * dev)
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{
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DRM_DEBUG("\n");
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if (dev->driver->lastclose)
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dev->driver->lastclose(dev);
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DRM_DEBUG("driver lastclose completed\n");
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if (drm_core_check_feature(dev, DRIVER_LEGACY))
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drm_legacy_dev_reinit(dev);
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drm_client_dev_restore(dev);
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}
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/**
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* drm_release - release method for DRM file
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* @inode: device inode
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* @filp: file pointer.
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*
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* This function must be used by drivers as their &file_operations.release
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* method. It frees any resources associated with the open file, and calls the
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* &drm_driver.postclose driver callback. If this is the last open file for the
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* DRM device also proceeds to call the &drm_driver.lastclose driver callback.
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*
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* RETURNS:
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*
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* Always succeeds and returns 0.
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*/
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int drm_release(struct inode *inode, struct file *filp)
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{
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struct drm_file *file_priv = filp->private_data;
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struct drm_minor *minor = file_priv->minor;
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struct drm_device *dev = minor->dev;
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mutex_lock(&drm_global_mutex);
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DRM_DEBUG("open_count = %d\n", dev->open_count);
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mutex_lock(&dev->filelist_mutex);
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list_del(&file_priv->lhead);
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mutex_unlock(&dev->filelist_mutex);
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drm_file_free(file_priv);
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if (!--dev->open_count) {
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drm_lastclose(dev);
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if (drm_dev_is_unplugged(dev))
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drm_put_dev(dev);
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}
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mutex_unlock(&drm_global_mutex);
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drm_minor_release(minor);
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return 0;
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}
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EXPORT_SYMBOL(drm_release);
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/**
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* drm_read - read method for DRM file
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* @filp: file pointer
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* @buffer: userspace destination pointer for the read
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* @count: count in bytes to read
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* @offset: offset to read
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*
|
|
* 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);
|