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![Gustavo Padovan](/assets/img/avatar_default.png)
Now a drm_pending_event can either send a real drm_event or signal a fence, or both. It allow us to signal via fences when the buffer is displayed on the screen. Which in turn means that the previous buffer is not in use anymore and can be freed or sent back to another driver for processing. v2: Comments from Daniel Vetter - call fence_signal in drm_send_event_locked() - remove unneeded !e->event check v3: Remove drm_pending_event->destroy to fix a leak when e->file_priv is not set. Reviewed-by: Sean Paul <seanpaul@chromium.org> Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk> (v2) [danvet: fix one e->destroy in arcpgu due to rebasing.] Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: http://patchwork.freedesktop.org/patch/msgid/1464818821-5736-13-git-send-email-daniel.vetter@ffwll.ch
839 lines
23 KiB
C
839 lines
23 KiB
C
/*
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* \file drm_fops.c
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* File operations for DRM
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*
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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 <drm/drmP.h>
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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_legacy.h"
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#include "drm_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 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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* Drivers which implement private ioctls that require 32/64 bit compatibility
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* support must provided their onw .compat_ioctl() handler that processes
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* private ioctls and calls 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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* 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().
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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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* #ifdef CONFIG_COMPAT
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* .compat_ioctl = drm_compat_ioctl,
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* #endif
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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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static int drm_open_helper(struct file *filp, struct drm_minor *minor);
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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_MODESET)) {
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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 .open() #file_operations
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* method. It looks up the correct DRM device and instantiates all the per-file
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* resources for it.
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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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* drm_new_set_master - Allocate a new master object and become master for the
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* associated master realm.
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*
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* @dev: The associated device.
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* @fpriv: File private identifying the client.
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*
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* This function must be called with dev::struct_mutex held.
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* Returns negative error code on failure. Zero on success.
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*/
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int drm_new_set_master(struct drm_device *dev, struct drm_file *fpriv)
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{
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struct drm_master *old_master;
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int ret;
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lockdep_assert_held_once(&dev->master_mutex);
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/* create a new master */
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fpriv->minor->master = drm_master_create(fpriv->minor);
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if (!fpriv->minor->master)
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return -ENOMEM;
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/* take another reference for the copy in the local file priv */
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old_master = fpriv->master;
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fpriv->master = drm_master_get(fpriv->minor->master);
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if (dev->driver->master_create) {
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ret = dev->driver->master_create(dev, fpriv->master);
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if (ret)
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goto out_err;
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}
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if (dev->driver->master_set) {
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ret = dev->driver->master_set(dev, fpriv, true);
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if (ret)
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goto out_err;
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}
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fpriv->is_master = 1;
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fpriv->allowed_master = 1;
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fpriv->authenticated = 1;
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if (old_master)
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drm_master_put(&old_master);
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return 0;
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out_err:
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/* drop both references and restore old master on failure */
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drm_master_put(&fpriv->minor->master);
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drm_master_put(&fpriv->master);
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fpriv->master = old_master;
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return ret;
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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 = kzalloc(sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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filp->private_data = priv;
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priv->filp = filp;
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priv->uid = current_euid();
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priv->pid = get_pid(task_pid(current));
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priv->minor = minor;
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/* for compatibility root is always authenticated */
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priv->authenticated = capable(CAP_SYS_ADMIN);
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priv->lock_count = 0;
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INIT_LIST_HEAD(&priv->lhead);
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INIT_LIST_HEAD(&priv->fbs);
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mutex_init(&priv->fbs_lock);
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INIT_LIST_HEAD(&priv->blobs);
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INIT_LIST_HEAD(&priv->pending_event_list);
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INIT_LIST_HEAD(&priv->event_list);
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init_waitqueue_head(&priv->event_wait);
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priv->event_space = 4096; /* set aside 4k for event buffer */
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mutex_init(&priv->event_read_lock);
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if (drm_core_check_feature(dev, DRIVER_GEM))
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drm_gem_open(dev, priv);
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if (drm_core_check_feature(dev, DRIVER_PRIME))
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drm_prime_init_file_private(&priv->prime);
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if (dev->driver->open) {
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ret = dev->driver->open(dev, priv);
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if (ret < 0)
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goto out_prime_destroy;
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}
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/* if there is no current master make this fd it, but do not create
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* any master object for render clients */
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mutex_lock(&dev->master_mutex);
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if (drm_is_primary_client(priv) && !priv->minor->master) {
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/* create a new master */
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ret = drm_new_set_master(dev, priv);
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if (ret)
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goto out_close;
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} else if (drm_is_primary_client(priv)) {
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/* get a reference to the master */
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priv->master = drm_master_get(priv->minor->master);
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}
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mutex_unlock(&dev->master_mutex);
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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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out_close:
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mutex_unlock(&dev->master_mutex);
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if (dev->driver->postclose)
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dev->driver->postclose(dev, priv);
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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(&priv->prime);
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if (drm_core_check_feature(dev, DRIVER_GEM))
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drm_gem_release(dev, priv);
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put_pid(priv->pid);
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kfree(priv);
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filp->private_data = NULL;
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return ret;
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}
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static void drm_master_release(struct drm_device *dev, struct file *filp)
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{
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struct drm_file *file_priv = filp->private_data;
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if (drm_legacy_i_have_hw_lock(dev, file_priv)) {
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DRM_DEBUG("File %p released, freeing lock for context %d\n",
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filp, _DRM_LOCKING_CONTEXT(file_priv->master->lock.hw_lock->lock));
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drm_legacy_lock_free(&file_priv->master->lock,
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_DRM_LOCKING_CONTEXT(file_priv->master->lock.hw_lock->lock));
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}
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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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/*
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* drm_legacy_dev_reinit
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*
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* Reinitializes a legacy/ums drm device in it's lastclose function.
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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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|
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mutex_unlock(&dev->struct_mutex);
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dev->sigdata.lock = NULL;
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|
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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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|
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/*
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* Take down the DRM device.
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*
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* \param dev DRM device structure.
|
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*
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* Frees every resource in \p dev.
|
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*
|
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* \sa drm_device
|
|
*/
|
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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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|
|
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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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|
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if (!drm_core_check_feature(dev, DRIVER_MODESET))
|
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drm_legacy_dev_reinit(dev);
|
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}
|
|
|
|
/**
|
|
* drm_release - release method for DRM file
|
|
* @inode: device inode
|
|
* @filp: file pointer.
|
|
*
|
|
* This function must be used by drivers as their .release() #file_operations
|
|
* method. It frees any resources associated with the open file, and if this is
|
|
* the last open file for the DRM device also proceeds to call drm_lastclose().
|
|
*
|
|
* 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);
|
|
|
|
mutex_lock(&dev->struct_mutex);
|
|
if (file_priv->magic)
|
|
idr_remove(&file_priv->master->magic_map, file_priv->magic);
|
|
mutex_unlock(&dev->struct_mutex);
|
|
|
|
if (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 the master has gone away we can't do anything with the lock */
|
|
if (file_priv->minor->master)
|
|
drm_master_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_GEM))
|
|
drm_gem_release(dev, file_priv);
|
|
|
|
drm_legacy_ctxbitmap_flush(dev, file_priv);
|
|
|
|
mutex_lock(&dev->master_mutex);
|
|
|
|
if (file_priv->is_master) {
|
|
struct drm_master *master = file_priv->master;
|
|
|
|
/*
|
|
* Since the master is disappearing, so is the
|
|
* possibility to lock.
|
|
*/
|
|
mutex_lock(&dev->struct_mutex);
|
|
if (master->lock.hw_lock) {
|
|
if (dev->sigdata.lock == master->lock.hw_lock)
|
|
dev->sigdata.lock = NULL;
|
|
master->lock.hw_lock = NULL;
|
|
master->lock.file_priv = NULL;
|
|
wake_up_interruptible_all(&master->lock.lock_queue);
|
|
}
|
|
mutex_unlock(&dev->struct_mutex);
|
|
|
|
if (file_priv->minor->master == file_priv->master) {
|
|
/* drop the reference held my the minor */
|
|
if (dev->driver->master_drop)
|
|
dev->driver->master_drop(dev, file_priv, true);
|
|
drm_master_put(&file_priv->minor->master);
|
|
}
|
|
}
|
|
|
|
/* drop the master reference held by the file priv */
|
|
if (file_priv->master)
|
|
drm_master_put(&file_priv->master);
|
|
file_priv->is_master = 0;
|
|
mutex_unlock(&dev->master_mutex);
|
|
|
|
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_device_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 .read() #file_operations
|
|
* 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 ignore, DRM events are read like a pipe. Therefore drivers also
|
|
* must set the .llseek() #file_operation 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 .read() #file_operations
|
|
* 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.
|
|
*/
|
|
unsigned int drm_poll(struct file *filp, struct poll_table_struct *wait)
|
|
{
|
|
struct drm_file *file_priv = filp->private_data;
|
|
unsigned int mask = 0;
|
|
|
|
poll_wait(filp, &file_priv->event_wait, wait);
|
|
|
|
if (!list_empty(&file_priv->event_list))
|
|
mask |= POLLIN | POLLRDNORM;
|
|
|
|
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 dev->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 dev->event_lock should use
|
|
* drm_event_reserve_init() 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.
|
|
*/
|
|
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);
|
|
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
|
|
* dev->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->fence) {
|
|
fence_signal(e->fence);
|
|
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 dev->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);
|