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