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_placement.h (3487B)


      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,
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     25 *
     26 **************************************************************************/
     27/*
     28 * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
     29 */
     30
     31#ifndef _TTM_PLACEMENT_H_
     32#define _TTM_PLACEMENT_H_
     33
     34#include <linux/types.h>
     35
     36/*
     37 * Memory regions for data placement.
     38 *
     39 * Buffers placed in TTM_PL_SYSTEM are considered under TTMs control and can
     40 * be swapped out whenever TTMs thinks it is a good idea.
     41 * In cases where drivers would like to use TTM_PL_SYSTEM as a valid
     42 * placement they need to be able to handle the issues that arise due to the
     43 * above manually.
     44 *
     45 * For BO's which reside in system memory but for which the accelerator
     46 * requires direct access (i.e. their usage needs to be synchronized
     47 * between the CPU and accelerator via fences) a new, driver private
     48 * placement that can handle such scenarios is a good idea.
     49 */
     50
     51#define TTM_PL_SYSTEM           0
     52#define TTM_PL_TT               1
     53#define TTM_PL_VRAM             2
     54#define TTM_PL_PRIV             3
     55
     56/*
     57 * TTM_PL_FLAG_TOPDOWN requests to be placed from the
     58 * top of the memory area, instead of the bottom.
     59 */
     60
     61#define TTM_PL_FLAG_CONTIGUOUS  (1 << 0)
     62#define TTM_PL_FLAG_TOPDOWN     (1 << 1)
     63
     64/* For multihop handling */
     65#define TTM_PL_FLAG_TEMPORARY   (1 << 2)
     66
     67/**
     68 * struct ttm_place
     69 *
     70 * @fpfn:	first valid page frame number to put the object
     71 * @lpfn:	last valid page frame number to put the object
     72 * @mem_type:	One of TTM_PL_* where the resource should be allocated from.
     73 * @flags:	memory domain and caching flags for the object
     74 *
     75 * Structure indicating a possible place to put an object.
     76 */
     77struct ttm_place {
     78	unsigned	fpfn;
     79	unsigned	lpfn;
     80	uint32_t	mem_type;
     81	uint32_t	flags;
     82};
     83
     84/**
     85 * struct ttm_placement
     86 *
     87 * @num_placement:	number of preferred placements
     88 * @placement:		preferred placements
     89 * @num_busy_placement:	number of preferred placements when need to evict buffer
     90 * @busy_placement:	preferred placements when need to evict buffer
     91 *
     92 * Structure indicating the placement you request for an object.
     93 */
     94struct ttm_placement {
     95	unsigned		num_placement;
     96	const struct ttm_place	*placement;
     97	unsigned		num_busy_placement;
     98	const struct ttm_place	*busy_placement;
     99};
    100
    101#endif