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/**************************************************************************
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 *
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 * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., 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 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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 * 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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 **************************************************************************/
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/*
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 * Authors: Thomas Hellstrom
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 */
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#ifndef _TTM_EXECBUF_UTIL_H_
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#define _TTM_EXECBUF_UTIL_H_
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#include
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#include
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/**
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 * struct ttm_validate_buffer
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 *
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 * @head:           list head for thread-private list.
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 * @bo:             refcounted buffer object pointer.
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 * @reserved:       Indicates whether @bo has been reserved for validation.
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 * @removed:        Indicates whether @bo has been removed from lru lists.
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 * @put_count:      Number of outstanding references on bo::list_kref.
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 * @old_sync_obj:   Pointer to a sync object about to be unreferenced
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 */
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struct ttm_validate_buffer {
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	struct list_head head;
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	struct ttm_buffer_object *bo;
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	bool reserved;
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	bool removed;
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	int put_count;
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	void *old_sync_obj;
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};
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/**
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 * function ttm_eu_backoff_reservation
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 *
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 * @list:     thread private list of ttm_validate_buffer structs.
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 *
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 * Undoes all buffer validation reservations for bos pointed to by
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 * the list entries.
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 */
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extern void ttm_eu_backoff_reservation(struct list_head *list);
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/**
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 * function ttm_eu_reserve_buffers
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 *
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 * @list:    thread private list of ttm_validate_buffer structs.
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 *
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 * Tries to reserve bos pointed to by the list entries for validation.
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 * If the function returns 0, all buffers are marked as "unfenced",
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 * taken off the lru lists and are not synced for write CPU usage.
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 *
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 * If the function detects a deadlock due to multiple threads trying to
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 * reserve the same buffers in reverse order, all threads except one will
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 * back off and retry. This function may sleep while waiting for
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 * CPU write reservations to be cleared, and for other threads to
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 * unreserve their buffers.
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 *
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 * This function may return -ERESTART or -EAGAIN if the calling process
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 * receives a signal while waiting. In that case, no buffers on the list
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 * will be reserved upon return.
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 *
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 * Buffers reserved by this function should be unreserved by
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 * a call to either ttm_eu_backoff_reservation() or
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 * ttm_eu_fence_buffer_objects() when command submission is complete or
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 * has failed.
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 */
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extern int ttm_eu_reserve_buffers(struct list_head *list);
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/**
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 * function ttm_eu_fence_buffer_objects.
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 *
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 * @list:        thread private list of ttm_validate_buffer structs.
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 * @sync_obj:    The new sync object for the buffers.
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 *
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 * This function should be called when command submission is complete, and
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 * it will add a new sync object to bos pointed to by entries on @list.
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 * It also unreserves all buffers, putting them on lru lists.
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 *
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 */
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extern void ttm_eu_fence_buffer_objects(struct list_head *list, void *sync_obj);
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#endif