| /************************************************************************** |
| * |
| * 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. |
| * @new_sync_obj_arg: New sync_obj_arg for @bo, to be used once |
| * adding a new sync object. |
| * @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. |
| */ |
| |
| struct ttm_validate_buffer { |
| struct list_head head; |
| struct ttm_buffer_object *bo; |
| void *new_sync_obj_arg; |
| bool reserved; |
| bool removed; |
| int put_count; |
| }; |
| |
| /** |
| * 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. |
| * @val_seq: A unique sequence number. |
| * |
| * 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, uint32_t val_seq); |
| |
| /** |
| * 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 |