288 lines
7.4 KiB
C
288 lines
7.4 KiB
C
/**************************************************************************
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*
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* Copyright 2006 Tungsten Graphics, Inc., Bismarck, ND., USA
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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
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sub license, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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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 NON-INFRINGEMENT. IN NO EVENT SHALL
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* THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
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* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
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* USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial portions
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* of the Software.
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*
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*
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**************************************************************************/
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#include "drmP.h"
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int drm_add_user_object(drm_file_t * priv, drm_user_object_t * item,
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int shareable)
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{
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drm_device_t *dev = priv->head->dev;
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int ret;
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atomic_set(&item->refcount, 1);
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item->shareable = shareable;
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item->owner = priv;
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ret = drm_ht_just_insert_please(&dev->object_hash, &item->hash,
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(unsigned long)item, 32, 0, 0);
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if (ret)
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return ret;
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list_add_tail(&item->list, &priv->user_objects);
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return 0;
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}
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drm_user_object_t *drm_lookup_user_object(drm_file_t * priv, uint32_t key)
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{
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drm_device_t *dev = priv->head->dev;
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drm_hash_item_t *hash;
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int ret;
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drm_user_object_t *item;
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ret = drm_ht_find_item(&dev->object_hash, key, &hash);
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if (ret) {
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return NULL;
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}
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item = drm_hash_entry(hash, drm_user_object_t, hash);
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if (priv != item->owner) {
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drm_open_hash_t *ht = &priv->refd_object_hash[_DRM_REF_USE];
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ret = drm_ht_find_item(ht, (unsigned long)item, &hash);
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if (ret) {
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DRM_ERROR("Object not registered for usage\n");
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return NULL;
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}
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}
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return item;
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}
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static void drm_deref_user_object(drm_file_t * priv, drm_user_object_t * item)
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{
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drm_device_t *dev = priv->head->dev;
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int ret;
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if (atomic_dec_and_test(&item->refcount)) {
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ret = drm_ht_remove_item(&dev->object_hash, &item->hash);
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BUG_ON(ret);
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list_del_init(&item->list);
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item->remove(priv, item);
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}
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}
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int drm_remove_user_object(drm_file_t * priv, drm_user_object_t * item)
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{
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if (item->owner != priv) {
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DRM_ERROR("Cannot destroy object not owned by you.\n");
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return -EINVAL;
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}
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item->owner = 0;
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item->shareable = 0;
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list_del_init(&item->list);
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drm_deref_user_object(priv, item);
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return 0;
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}
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static int drm_object_ref_action(drm_file_t * priv, drm_user_object_t * ro,
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drm_ref_t action)
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{
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int ret = 0;
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switch (action) {
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case _DRM_REF_USE:
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atomic_inc(&ro->refcount);
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break;
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default:
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if (!ro->ref_struct_locked) {
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break;
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} else {
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ro->ref_struct_locked(priv, ro, action);
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}
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}
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return ret;
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}
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int drm_add_ref_object(drm_file_t * priv, drm_user_object_t * referenced_object,
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drm_ref_t ref_action)
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{
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int ret = 0;
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drm_ref_object_t *item;
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drm_open_hash_t *ht = &priv->refd_object_hash[ref_action];
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if (!referenced_object->shareable && priv != referenced_object->owner) {
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DRM_ERROR("Not allowed to reference this object\n");
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return -EINVAL;
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}
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/*
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* If this is not a usage reference, Check that usage has been registered
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* first. Otherwise strange things may happen on destruction.
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*/
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if ((ref_action != _DRM_REF_USE) && priv != referenced_object->owner) {
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item =
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drm_lookup_ref_object(priv, referenced_object,
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_DRM_REF_USE);
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if (!item) {
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DRM_ERROR
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("Object not registered for usage by this client\n");
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return -EINVAL;
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}
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}
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if (NULL !=
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(item =
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drm_lookup_ref_object(priv, referenced_object, ref_action))) {
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atomic_inc(&item->refcount);
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return drm_object_ref_action(priv, referenced_object,
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ref_action);
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}
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item = drm_calloc(1, sizeof(*item), DRM_MEM_OBJECTS);
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if (item == NULL) {
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DRM_ERROR("Could not allocate reference object\n");
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return -ENOMEM;
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}
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atomic_set(&item->refcount, 1);
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item->hash.key = (unsigned long)referenced_object;
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ret = drm_ht_insert_item(ht, &item->hash);
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item->unref_action = ref_action;
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if (ret)
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goto out;
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list_add(&item->list, &priv->refd_objects);
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ret = drm_object_ref_action(priv, referenced_object, ref_action);
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out:
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return ret;
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}
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drm_ref_object_t *drm_lookup_ref_object(drm_file_t * priv,
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drm_user_object_t * referenced_object,
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drm_ref_t ref_action)
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{
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drm_hash_item_t *hash;
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int ret;
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ret = drm_ht_find_item(&priv->refd_object_hash[ref_action],
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(unsigned long)referenced_object, &hash);
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if (ret)
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return NULL;
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return drm_hash_entry(hash, drm_ref_object_t, hash);
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}
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static void drm_remove_other_references(drm_file_t * priv,
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drm_user_object_t * ro)
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{
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int i;
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drm_open_hash_t *ht;
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drm_hash_item_t *hash;
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drm_ref_object_t *item;
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for (i = _DRM_REF_USE + 1; i < _DRM_NO_REF_TYPES; ++i) {
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ht = &priv->refd_object_hash[i];
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while (!drm_ht_find_item(ht, (unsigned long)ro, &hash)) {
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item = drm_hash_entry(hash, drm_ref_object_t, hash);
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drm_remove_ref_object(priv, item);
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}
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}
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}
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void drm_remove_ref_object(drm_file_t * priv, drm_ref_object_t * item)
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{
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int ret;
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drm_user_object_t *user_object = (drm_user_object_t *) item->hash.key;
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drm_open_hash_t *ht = &priv->refd_object_hash[item->unref_action];
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drm_ref_t unref_action;
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unref_action = item->unref_action;
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if (atomic_dec_and_test(&item->refcount)) {
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ret = drm_ht_remove_item(ht, &item->hash);
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BUG_ON(ret);
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list_del_init(&item->list);
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if (unref_action == _DRM_REF_USE)
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drm_remove_other_references(priv, user_object);
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drm_free(item, sizeof(*item), DRM_MEM_OBJECTS);
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}
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switch (unref_action) {
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case _DRM_REF_USE:
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drm_deref_user_object(priv, user_object);
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break;
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default:
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BUG_ON(!user_object->unref);
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user_object->unref(priv, user_object, unref_action);
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break;
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}
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}
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int drm_user_object_ref(drm_file_t * priv, uint32_t user_token,
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drm_object_type_t type, drm_user_object_t ** object)
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{
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drm_device_t *dev = priv->head->dev;
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drm_user_object_t *uo;
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int ret;
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mutex_lock(&dev->struct_mutex);
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uo = drm_lookup_user_object(priv, user_token);
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if (!uo || (uo->type != type)) {
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ret = -EINVAL;
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goto out_err;
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}
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ret = drm_add_ref_object(priv, uo, _DRM_REF_USE);
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if (ret)
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goto out_err;
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mutex_unlock(&dev->struct_mutex);
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*object = uo;
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DRM_ERROR("Referenced an object\n");
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return 0;
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out_err:
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mutex_unlock(&dev->struct_mutex);
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return ret;
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}
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int drm_user_object_unref(drm_file_t * priv, uint32_t user_token,
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drm_object_type_t type)
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{
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drm_device_t *dev = priv->head->dev;
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drm_user_object_t *uo;
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drm_ref_object_t *ro;
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int ret;
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mutex_lock(&dev->struct_mutex);
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uo = drm_lookup_user_object(priv, user_token);
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if (!uo || (uo->type != type)) {
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ret = -EINVAL;
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goto out_err;
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}
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ro = drm_lookup_ref_object(priv, uo, _DRM_REF_USE);
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if (!ro) {
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ret = -EINVAL;
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goto out_err;
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}
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drm_remove_ref_object(priv, ro);
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mutex_unlock(&dev->struct_mutex);
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DRM_ERROR("Unreferenced an object\n");
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return 0;
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out_err:
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mutex_unlock(&dev->struct_mutex);
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return ret;
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}
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