0,0 → 1,109 |
/************************************************************************** |
* |
* 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 |