The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/dev/drm2/ttm/ttm_execbuf_util.h

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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 /* $FreeBSD$ */
   31 
   32 #ifndef _TTM_EXECBUF_UTIL_H_
   33 #define _TTM_EXECBUF_UTIL_H_
   34 
   35 #include <dev/drm2/ttm/ttm_bo_api.h>
   36 
   37 /**
   38  * struct ttm_validate_buffer
   39  *
   40  * @head:           list head for thread-private list.
   41  * @bo:             refcounted buffer object pointer.
   42  * @reserved:       Indicates whether @bo has been reserved for validation.
   43  * @removed:        Indicates whether @bo has been removed from lru lists.
   44  * @put_count:      Number of outstanding references on bo::list_kref.
   45  * @old_sync_obj:   Pointer to a sync object about to be unreferenced
   46  */
   47 
   48 struct ttm_validate_buffer {
   49         struct list_head head;
   50         struct ttm_buffer_object *bo;
   51         bool reserved;
   52         bool removed;
   53         int put_count;
   54         void *old_sync_obj;
   55 };
   56 
   57 /**
   58  * function ttm_eu_backoff_reservation
   59  *
   60  * @list:     thread private list of ttm_validate_buffer structs.
   61  *
   62  * Undoes all buffer validation reservations for bos pointed to by
   63  * the list entries.
   64  */
   65 
   66 extern void ttm_eu_backoff_reservation(struct list_head *list);
   67 
   68 /**
   69  * function ttm_eu_reserve_buffers
   70  *
   71  * @list:    thread private list of ttm_validate_buffer structs.
   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  * This function may return -ERESTART or -EAGAIN if the calling process
   84  * receives a signal while waiting. In that case, no buffers on the list
   85  * will be reserved upon return.
   86  *
   87  * Buffers reserved by this function should be unreserved by
   88  * a call to either ttm_eu_backoff_reservation() or
   89  * ttm_eu_fence_buffer_objects() when command submission is complete or
   90  * has failed.
   91  */
   92 
   93 extern int ttm_eu_reserve_buffers(struct list_head *list);
   94 
   95 /**
   96  * function ttm_eu_fence_buffer_objects.
   97  *
   98  * @list:        thread private list of ttm_validate_buffer structs.
   99  * @sync_obj:    The new sync object for the buffers.
  100  *
  101  * This function should be called when command submission is complete, and
  102  * it will add a new sync object to bos pointed to by entries on @list.
  103  * It also unreserves all buffers, putting them on lru lists.
  104  *
  105  */
  106 
  107 extern void ttm_eu_fence_buffer_objects(struct list_head *list, void *sync_obj);
  108 
  109 #endif

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