include/drm/ttm/ttm_execbuf_util.h

   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,
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  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 <linux/list.h>
  35
  36 #include "ttm_bo_api.h"
  37
  38 /**
  39  * struct ttm_validate_buffer
  40  *
  41  * @head:           list head for thread-private list.
  42  * @bo:             refcounted buffer object pointer.
  43  * @shared:         should the fence be added shared?
  44  */
  45
  46 struct ttm_validate_buffer {
  47         struct list_head head;
  48         struct ttm_buffer_object *bo;
  49         bool shared;
  50 };
  51
  52 /**
  53  * function ttm_eu_backoff_reservation
  54  *
  55  * @ticket:   ww_acquire_ctx from reserve call
  56  * @list:     thread private list of ttm_validate_buffer structs.
  57  *
  58  * Undoes all buffer validation reservations for bos pointed to by
  59  * the list entries.
  60  */
  61
  62 extern void ttm_eu_backoff_reservation(struct ww_acquire_ctx *ticket,
  63                                        struct list_head *list);
  64
  65 /**
  66  * function ttm_eu_reserve_buffers
  67  *
  68  * @ticket:  [out] ww_acquire_ctx filled in by call, or NULL if only
  69  *           non-blocking reserves should be tried.
  70  * @list:    thread private list of ttm_validate_buffer structs.
  71  * @intr:    should the wait be interruptible
  72  * @dups:    [out] optional list of duplicates.
  73  *
  74  * Tries to reserve bos pointed to by the list entries for validation.
  75  * If the function returns 0, all buffers are marked as "unfenced",
  76  * taken off the lru lists and are not synced for write CPU usage.
  77  *
  78  * If the function detects a deadlock due to multiple threads trying to
  79  * reserve the same buffers in reverse order, all threads except one will
  80  * back off and retry. This function may sleep while waiting for
  81  * CPU write reservations to be cleared, and for other threads to
  82  * unreserve their buffers.
  83  *
  84  * If intr is set to true, this function may return -ERESTARTSYS if the
  85  * calling process receives a signal while waiting. In that case, no
  86  * buffers on the list will be reserved upon return.
  87  *
  88  * If dups is non NULL all buffers already reserved by the current thread
  89  * (e.g. duplicates) are added to this list, otherwise -EALREADY is returned
  90  * on the first already reserved buffer and all buffers from the list are
  91  * unreserved again.
  92  *
  93  * Buffers reserved by this function should be unreserved by
  94  * a call to either ttm_eu_backoff_reservation() or
  95  * ttm_eu_fence_buffer_objects() when command submission is complete or
  96  * has failed.
  97  */
  98
  99 extern int ttm_eu_reserve_buffers(struct ww_acquire_ctx *ticket,
 100                                   struct list_head *list, bool intr,
 101                                   struct list_head *dups);
 102
 103 /**
 104  * function ttm_eu_fence_buffer_objects.
 105  *
 106  * @ticket:      ww_acquire_ctx from reserve call
 107  * @list:        thread private list of ttm_validate_buffer structs.
 108  * @fence:       The new exclusive fence for the buffers.
 109  *
 110  * This function should be called when command submission is complete, and
 111  * it will add a new sync object to bos pointed to by entries on @list.
 112  * It also unreserves all buffers, putting them on lru lists.
 113  *
 114  */
 115
 116 extern void ttm_eu_fence_buffer_objects(struct ww_acquire_ctx *ticket,
 117                                         struct list_head *list,
 118                                         struct dma_fence *fence);
 119
 120 #endif