cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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ttm_execbuf_util.h (4481B)

      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 <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 * @num_shared:     How many shared fences we want to add.
     44 */
     45
     46struct ttm_validate_buffer {
     47	struct list_head head;
     48	struct ttm_buffer_object *bo;
     49	unsigned int num_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 */
     61void 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 * @del_lru: true if BOs should be removed from the LRU.
     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 */
     98int 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 */
    114void ttm_eu_fence_buffer_objects(struct ww_acquire_ctx *ticket,
    115				 struct list_head *list,
    116				 struct dma_fence *fence);
    117
    118#endif