include/drm/ttm/ttm_execbuf_util.h

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   3  * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
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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  * @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