include/drm/ttm/ttm_execbuf_util.h

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   3  * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
   4  * All Rights Reserved.
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  15  * next paragraph) shall be included in all copies or substantial portions
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  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  */
  43
  44 struct ttm_validate_buffer {
  45         struct list_head head;
  46         struct ttm_buffer_object *bo;
  47 };
  48
  49 /**
  50  * function ttm_eu_backoff_reservation
  51  *
  52  * @ticket:   ww_acquire_ctx from reserve call
  53  * @list:     thread private list of ttm_validate_buffer structs.
  54  *
  55  * Undoes all buffer validation reservations for bos pointed to by
  56  * the list entries.
  57  */
  58
  59 extern void ttm_eu_backoff_reservation(struct ww_acquire_ctx *ticket,
  60                                        struct list_head *list);
  61
  62 /**
  63  * function ttm_eu_reserve_buffers
  64  *
  65  * @ticket:  [out] ww_acquire_ctx filled in by call, or NULL if only
  66  *           non-blocking reserves should be tried.
  67  * @list:    thread private list of ttm_validate_buffer structs.
  68  * @intr:    should the wait be interruptible
  69  *
  70  * Tries to reserve bos pointed to by the list entries for validation.
  71  * If the function returns 0, all buffers are marked as "unfenced",
  72  * taken off the lru lists and are not synced for write CPU usage.
  73  *
  74  * If the function detects a deadlock due to multiple threads trying to
  75  * reserve the same buffers in reverse order, all threads except one will
  76  * back off and retry. This function may sleep while waiting for
  77  * CPU write reservations to be cleared, and for other threads to
  78  * unreserve their buffers.
  79  *
  80  * If intr is set to true, this function may return -ERESTARTSYS if the
  81  * calling process receives a signal while waiting. In that case, no
  82  * buffers on the list will be reserved upon return.
  83  *
  84  * Buffers reserved by this function should be unreserved by
  85  * a call to either ttm_eu_backoff_reservation() or
  86  * ttm_eu_fence_buffer_objects() when command submission is complete or
  87  * has failed.
  88  */
  89
  90 extern int ttm_eu_reserve_buffers(struct ww_acquire_ctx *ticket,
  91                                   struct list_head *list, bool intr);
  92
  93 /**
  94  * function ttm_eu_fence_buffer_objects.
  95  *
  96  * @ticket:      ww_acquire_ctx from reserve call
  97  * @list:        thread private list of ttm_validate_buffer structs.
  98  * @fence:       The new exclusive fence for the buffers.
  99  *
 100  * This function should be called when command submission is complete, and
 101  * it will add a new sync object to bos pointed to by entries on @list.
 102  * It also unreserves all buffers, putting them on lru lists.
 103  *
 104  */
 105
 106 extern void ttm_eu_fence_buffer_objects(struct ww_acquire_ctx *ticket,
 107                                         struct list_head *list,
 108                                         struct fence *fence);
 109
 110 #endif