forked from luck/tmp_suning_uos_patched
drm: provide management functions for drm_file
Rather than doing drm_file allocation/destruction right in the fops, lets provide separate helpers. This decouples drm_file management from the still-mandatory drm-fops. It prepares for use of drm_file without the fops, both by possible separate fops implementations and APIs (not that I am aware of any such plans), and more importantly from in-kernel use where no real file is available. Signed-off-by: David Herrmann <dh.herrmann@gmail.com> Signed-off-by: Noralf Trønnes <noralf@tronnes.org> Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: https://patchwork.freedesktop.org/patch/msgid/20180618141739.48151-2-noralf@tronnes.org
This commit is contained in:
David Herrmann
Noralf Trønnes
parent
46d8f405e1
commit
1572042a4a
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@ -101,6 +101,175 @@ DEFINE_MUTEX(drm_global_mutex);
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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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if (drm_is_primary_client(file)) {
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ret = drm_master_open(file);
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if (ret)
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goto out_close;
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}
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return file;
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out_close:
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if (dev->driver->postclose)
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dev->driver->postclose(dev, 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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@ -196,7 +365,6 @@ 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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@ -207,51 +375,13 @@ static int drm_open_helper(struct file *filp, struct drm_minor *minor)
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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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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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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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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_SYNCOBJ))
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drm_syncobj_open(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 (drm_is_primary_client(priv)) {
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ret = drm_master_open(priv);
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if (ret)
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goto out_close;
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}
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mutex_lock(&dev->filelist_mutex);
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list_add(&priv->lhead, &dev->filelist);
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@ -278,45 +408,6 @@ static int drm_open_helper(struct file *filp, struct drm_minor *minor)
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#endif
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return 0;
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out_close:
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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_SYNCOBJ))
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drm_syncobj_release(priv);
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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_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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static void drm_legacy_dev_reinit(struct drm_device *dev)
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@ -383,57 +474,7 @@ int drm_release(struct inode *inode, struct file *filp)
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list_del(&file_priv->lhead);
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mutex_unlock(&dev->filelist_mutex);
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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_priv);
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/* ========================================================
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* Begin inline drm_release
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*/
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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_priv->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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drm_legacy_lock_release(dev, filp);
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if (drm_core_check_feature(dev, DRIVER_HAVE_DMA))
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drm_legacy_reclaim_buffers(dev, file_priv);
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drm_events_release(file_priv);
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if (drm_core_check_feature(dev, DRIVER_MODESET)) {
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drm_fb_release(file_priv);
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drm_property_destroy_user_blobs(dev, file_priv);
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}
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if (drm_core_check_feature(dev, DRIVER_SYNCOBJ))
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drm_syncobj_release(file_priv);
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if (drm_core_check_feature(dev, DRIVER_GEM))
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drm_gem_release(dev, file_priv);
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drm_legacy_ctxbitmap_flush(dev, file_priv);
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if (drm_is_primary_client(file_priv))
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drm_master_release(file_priv);
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if (dev->driver->postclose)
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dev->driver->postclose(dev, file_priv);
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if (drm_core_check_feature(dev, DRIVER_PRIME))
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drm_prime_destroy_file_private(&file_priv->prime);
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WARN_ON(!list_empty(&file_priv->event_list));
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put_pid(file_priv->pid);
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kfree(file_priv);
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/* ========================================================
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* End inline drm_release
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*/
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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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@ -26,6 +26,8 @@
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/* drm_file.c */
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extern struct mutex drm_global_mutex;
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struct drm_file *drm_file_alloc(struct drm_minor *minor);
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void drm_file_free(struct drm_file *file);
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void drm_lastclose(struct drm_device *dev);
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/* drm_pci.c */
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