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  1. /**************************************************************************
  2.  *
  3.  * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
  4.  * All Rights Reserved.
  5.  *
  6.  * Permission is hereby granted, free of charge, to any person obtaining a
  7.  * copy of this software and associated documentation files (the
  8.  * "Software"), to deal in the Software without restriction, including
  9.  * without limitation the rights to use, copy, modify, merge, publish,
  10.  * distribute, sub license, and/or sell copies of the Software, and to
  11.  * permit persons to whom the Software is furnished to do so, subject to
  12.  * the following conditions:
  13.  *
  14.  * The above copyright notice and this permission notice (including the
  15.  * next paragraph) shall be included in all copies or substantial portions
  16.  * of the Software.
  17.  *
  18.  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  19.  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20.  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  21.  * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
  22.  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  23.  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  24.  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  25.  *
  26.  **************************************************************************/
  27. /*
  28.  * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
  29.  */
  30.  
  31. #ifndef _TTM_EXECBUF_UTIL_H_
  32. #define _TTM_EXECBUF_UTIL_H_
  33.  
  34. #include <ttm/ttm_bo_api.h>
  35. #include <linux/list.h>
  36.  
  37. /**
  38.  * struct ttm_validate_buffer
  39.  *
  40.  * @head:           list head for thread-private list.
  41.  * @bo:             refcounted buffer object pointer.
  42.  * @shared:         should the fence be added shared?
  43.  */
  44.  
  45. struct ttm_validate_buffer {
  46.         struct list_head head;
  47.         struct ttm_buffer_object *bo;
  48.         bool shared;
  49. };
  50.  
  51. /**
  52.  * function ttm_eu_backoff_reservation
  53.  *
  54.  * @ticket:   ww_acquire_ctx from reserve call
  55.  * @list:     thread private list of ttm_validate_buffer structs.
  56.  *
  57.  * Undoes all buffer validation reservations for bos pointed to by
  58.  * the list entries.
  59.  */
  60.  
  61. extern void ttm_eu_backoff_reservation(struct ww_acquire_ctx *ticket,
  62.                                        struct list_head *list);
  63.  
  64. /**
  65.  * function ttm_eu_reserve_buffers
  66.  *
  67.  * @ticket:  [out] ww_acquire_ctx filled in by call, or NULL if only
  68.  *           non-blocking reserves should be tried.
  69.  * @list:    thread private list of ttm_validate_buffer structs.
  70.  * @intr:    should the wait be interruptible
  71.  * @dups:    [out] optional list of duplicates.
  72.  *
  73.  * Tries to reserve bos pointed to by the list entries for validation.
  74.  * If the function returns 0, all buffers are marked as "unfenced",
  75.  * taken off the lru lists and are not synced for write CPU usage.
  76.  *
  77.  * If the function detects a deadlock due to multiple threads trying to
  78.  * reserve the same buffers in reverse order, all threads except one will
  79.  * back off and retry. This function may sleep while waiting for
  80.  * CPU write reservations to be cleared, and for other threads to
  81.  * unreserve their buffers.
  82.  *
  83.  * If intr is set to true, this function may return -ERESTARTSYS if the
  84.  * calling process receives a signal while waiting. In that case, no
  85.  * buffers on the list will be reserved upon return.
  86.  *
  87.  * If dups is non NULL all buffers already reserved by the current thread
  88.  * (e.g. duplicates) are added to this list, otherwise -EALREADY is returned
  89.  * on the first already reserved buffer and all buffers from the list are
  90.  * unreserved again.
  91.  *
  92.  * Buffers reserved by this function should be unreserved by
  93.  * a call to either ttm_eu_backoff_reservation() or
  94.  * ttm_eu_fence_buffer_objects() when command submission is complete or
  95.  * has failed.
  96.  */
  97.  
  98. extern int ttm_eu_reserve_buffers(struct ww_acquire_ctx *ticket,
  99.                                   struct list_head *list, bool intr,
  100.                                   struct list_head *dups);
  101.  
  102. /**
  103.  * function ttm_eu_fence_buffer_objects.
  104.  *
  105.  * @ticket:      ww_acquire_ctx from reserve call
  106.  * @list:        thread private list of ttm_validate_buffer structs.
  107.  * @fence:       The new exclusive fence for the buffers.
  108.  *
  109.  * This function should be called when command submission is complete, and
  110.  * it will add a new sync object to bos pointed to by entries on @list.
  111.  * It also unreserves all buffers, putting them on lru lists.
  112.  *
  113.  */
  114.  
  115. extern void ttm_eu_fence_buffer_objects(struct ww_acquire_ctx *ticket,
  116.                                         struct list_head *list,
  117.                                         struct fence *fence);
  118.  
  119. #endif
  120.