renesas/drm.git - libdrm, cloned from git://anongit.freedesktop.org/mesa/drm

Age	Commit message (Expand)	Author
2006-12-01	Track linux-core symlinks in git.	Michel DÃ¤nzer

/************************************************************************** * * Copyright (c) 2006-2007 Tungsten Graphics, Inc., Cedar Park, TX., USA * All Rights Reserved. * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the * "Software"), to deal in the Software without restriction, including * without limitation the rights to use, copy, modify, merge, publish, * distribute, sub license, and/or sell copies of the Software, and to * permit persons to whom the Software is furnished to do so, subject to * the following conditions: * * The above copyright notice and this permission notice (including the * next paragraph) shall be included in all copies or substantial portions * of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE * USE OR OTHER DEALINGS IN THE SOFTWARE. * **************************************************************************/ /* * Authors: Thomas Hellström <thomas-at-tungstengraphics-dot-com> */ #include "drmP.h" int drm_add_user_object(struct drm_file *priv, struct drm_user_object *item, int shareable) { struct drm_device *dev = priv->minor->dev; int ret; DRM_ASSERT_LOCKED(&dev->struct_mutex); /* The refcount will be bumped to 1 when we add the ref object below. */ atomic_set(&item->refcount, 0); item->shareable = shareable; item->owner = priv; ret = drm_ht_just_insert_please(&dev->object_hash, &item->hash, (unsigned long)item, 31, 0, 0); if (ret) return ret; ret = drm_add_ref_object(priv, item, _DRM_REF_USE); if (ret) ret = drm_ht_remove_item(&dev->object_hash, &item->hash); return ret; } EXPORT_SYMBOL(drm_add_user_object); struct drm_user_object *drm_lookup_user_object(struct drm_file *priv, uint32_t key) { struct drm_device *dev = priv->minor->dev; struct drm_hash_item *hash; int ret; struct drm_user_object *item; DRM_ASSERT_LOCKED(&dev->struct_mutex); ret = drm_ht_find_item(&dev->object_hash, key, &hash); if (ret) return NULL; item = drm_hash_entry(hash, struct drm_user_object, hash); if (priv != item->owner) { struct drm_open_hash *ht = &priv->refd_object_hash[_DRM_REF_USE]; ret = drm_ht_find_item(ht, (unsigned long)item, &hash); if (ret) { DRM_ERROR("Object not registered for usage\n"); return NULL; } } return item; } EXPORT_SYMBOL(drm_lookup_user_object); static void drm_deref_user_object(struct drm_file *priv, struct drm_user_object *item) { struct drm_device *dev = priv->minor->dev; int ret; if (atomic_dec_and_test(&item->refcount)) { ret = drm_ht_remove_item(&dev->object_hash, &item->hash); BUG_ON(ret); item->remove(priv, item); } } static int drm_object_ref_action(struct drm_file *priv, struct drm_user_object *ro, enum drm_ref_type action) { int ret = 0; switch (action) { case _DRM_REF_USE: atomic_inc(&ro->refcount); break; default: if (!ro->ref_struct_locked) { break; } else { ro->ref_struct_locked(priv, ro, action); } } return ret; } int drm_add_ref_object(struct drm_file *priv, struct drm_user_object *referenced_object, enum drm_ref_type ref_action) { int ret = 0; struct drm_ref_object *item; struct drm_open_hash *ht = &priv->refd_object_hash[ref_action]; DRM_ASSERT_LOCKED(&priv->minor->dev->struct_mutex); if (!referenced_object->shareable && priv != referenced_object->owner) { DRM_ERROR("Not allowed to reference this object\n"); return -EINVAL; } /* * If this is not a usage reference, Check that usage has been registered * first. Otherwise strange things may happen on destruction. */ if ((ref_action != _DRM_REF_USE) && priv != referenced_object->owner) { item = drm_lookup_ref_object(priv, referenced_object, _DRM_REF_USE); if (!item) { DRM_ERROR ("Object not registered for usage by this client\n"); return -EINVAL; } } if (NULL != (item = drm_lookup_ref_object(priv, referenced_object, ref_action))) { atomic_inc(&item->refcount); return drm_object_ref_action(priv, referenced_object, ref_action); } item = drm_ctl_calloc(1, sizeof(*item), DRM_MEM_OBJECTS); if (item == NULL) { DRM_ERROR("Could not allocate reference object\n"); return -ENOMEM; } atomic_set(&item->refcount, 1); item->hash.key = (unsigned long)referenced_object; ret = drm_ht_insert_item(ht, &item->hash); item->unref_action = ref_action; if (ret) goto out; list_add(&item->list, &priv->refd_objects); ret = drm_object_ref_action(priv, referenced_object, ref_action); out: return ret; } struct drm_ref_object *drm_lookup_ref_object(struct drm_file *priv, struct drm_user_object *referenced_object, enum drm_ref_type ref_action) { struct drm_hash_item *hash; int ret; DRM_ASSERT_LOCKED(&priv->minor->dev->struct_mutex); ret = drm_ht_find_item(&priv->refd_object_hash[ref_action], (unsigned long)referenced_object, &hash); if (ret) return NULL; return drm_hash_entry(hash, struct drm_ref_object, hash); } EXPORT_SYMBOL(drm_lookup_ref_object); static void drm_remove_other_references(struct drm_file *priv, struct drm_user_object *ro) { int i; struct drm_open_hash *ht; struct drm_hash_item *hash; struct drm_ref_object *item; for (i = _DRM_REF_USE + 1; i < _DRM_NO_REF_TYPES; ++i) { ht = &priv->refd_object_hash[i]; while (!drm_ht_find_item(ht, (unsigned long)ro, &hash)) { item = drm_hash_entry(hash, struct drm_ref_object, hash); drm_remove_ref_object(priv, item); } } } void drm_remove_ref_object(struct drm_file *priv, struct drm_ref_object *item) { int ret; struct drm_user_object *user_object = (struct drm_user_object *) item->hash.key; struct drm_open_hash *ht = &priv->refd_object_hash[item->unref_action]; enum drm_ref_type unref_action; DRM_ASSERT_LOCKED(&priv->minor->dev->struct_mutex); unref_action = item->unref_action; if (atomic_dec_and_test(&item->refcount)) { ret = drm_ht_remove_item(ht, &item->hash); BUG_ON(ret); list_del_init(&item->list); if (unref_action == _DRM_REF_USE) drm_remove_other_references(priv, user_object); drm_ctl_free(item, sizeof(*item), DRM_MEM_OBJECTS); } switch (unref_action) { case _DRM_REF_USE: drm_deref_user_object(priv, user_object); break; default: BUG_ON(!user_object->unref); user_object->unref(priv, user_object, unref_action); break; } } EXPORT_SYMBOL(drm_remove_ref_object); int drm_user_object_ref(struct drm_file *priv, uint32_t user_token, enum drm_object_type type, struct drm_user_object **object) { struct drm_device *dev = priv->minor->dev; struct drm_user_object *uo; struct drm_hash_item *hash; int ret; mutex_lock(&dev->struct_mutex); ret = drm_ht_find_item(&dev->object_hash, user_token, &hash); if (ret) { DRM_ERROR("Could not find user object to reference.\n"); goto out_err; } uo = drm_hash_entry(hash, struct drm_user_object, hash); if (uo->type != type) { ret = -EINVAL; goto out_err; } ret = drm_add_ref_object(priv, uo, _DRM_REF_USE); if (ret) goto out_err; mutex_unlock(&dev->struct_mutex); *object = uo; return 0; out_err: mutex_unlock(&dev->struct_mutex); return ret; } int drm_user_object_unref(struct drm_file *priv, uint32_t user_token, enum drm_object_type type) { struct drm_device *dev = priv->minor->dev; struct drm_user_object *uo; struct drm_ref_object *ro; int ret; mutex_lock(&dev->struct_mutex); uo = drm_lookup_user_object(priv, user_token); if (!uo || (uo->type != type)) { ret = -EINVAL; goto out_err; } ro = drm_lookup_ref_object(priv, uo, _DRM_REF_USE); if (!ro) { ret = -EINVAL; goto out_err; } drm_remove_ref_object(priv, ro); mutex_unlock(&dev->struct_mutex); return 0; out_err: mutex_unlock(&dev->struct_mutex); return ret; }