LXR qemu/include/hw/block/block.h

   1/*
   2 * Common code for block device models
   3 *
   4 * Copyright (C) 2012 Red Hat, Inc.
   5 * Copyright (c) 2003-2008 Fabrice Bellard
   6 *
   7 * This work is licensed under the terms of the GNU GPL, version 2 or
   8 * later.  See the COPYING file in the top-level directory.
   9 */
  10
  11#ifndef HW_BLOCK_H
  12#define HW_BLOCK_H
  13
  14#include "exec/hwaddr.h"
  15#include "qapi/qapi-types-block-core.h"
  16
  17/* Configuration */
  18
  19typedef struct BlockConf {
  20    BlockBackend *blk;
  21    uint16_t physical_block_size;
  22    uint16_t logical_block_size;
  23    uint16_t min_io_size;
  24    uint32_t opt_io_size;
  25    int32_t bootindex;
  26    uint32_t discard_granularity;
  27    /* geometry, not all devices use this */
  28    uint32_t cyls, heads, secs;
  29    OnOffAuto wce;
  30    bool share_rw;
  31    BlockdevOnError rerror;
  32    BlockdevOnError werror;
  33} BlockConf;
  34
  35static inline unsigned int get_physical_block_exp(BlockConf *conf)
  36{
  37    unsigned int exp = 0, size;
  38
  39    for (size = conf->physical_block_size;
  40        size > conf->logical_block_size;
  41        size >>= 1) {
  42        exp++;
  43    }
  44
  45    return exp;
  46}
  47
  48#define DEFINE_BLOCK_PROPERTIES(_state, _conf)                          \
  49    DEFINE_PROP_DRIVE("drive", _state, _conf.blk),                      \
  50    DEFINE_PROP_BLOCKSIZE("logical_block_size", _state,                 \
  51                          _conf.logical_block_size),                    \
  52    DEFINE_PROP_BLOCKSIZE("physical_block_size", _state,                \
  53                          _conf.physical_block_size),                   \
  54    DEFINE_PROP_UINT16("min_io_size", _state, _conf.min_io_size, 0),  \
  55    DEFINE_PROP_UINT32("opt_io_size", _state, _conf.opt_io_size, 0),    \
  56    DEFINE_PROP_UINT32("discard_granularity", _state, \
  57                       _conf.discard_granularity, -1), \
  58    DEFINE_PROP_ON_OFF_AUTO("write-cache", _state, _conf.wce, \
  59                            ON_OFF_AUTO_AUTO), \
  60    DEFINE_PROP_BOOL("share-rw", _state, _conf.share_rw, false)
  61
  62#define DEFINE_BLOCK_CHS_PROPERTIES(_state, _conf)      \
  63    DEFINE_PROP_UINT32("cyls", _state, _conf.cyls, 0),  \
  64    DEFINE_PROP_UINT32("heads", _state, _conf.heads, 0), \
  65    DEFINE_PROP_UINT32("secs", _state, _conf.secs, 0)
  66
  67#define DEFINE_BLOCK_ERROR_PROPERTIES(_state, _conf)                    \
  68    DEFINE_PROP_BLOCKDEV_ON_ERROR("rerror", _state, _conf.rerror,       \
  69                                  BLOCKDEV_ON_ERROR_AUTO),              \
  70    DEFINE_PROP_BLOCKDEV_ON_ERROR("werror", _state, _conf.werror,       \
  71                                  BLOCKDEV_ON_ERROR_AUTO)
  72
  73/* Backend access helpers */
  74
  75bool blk_check_size_and_read_all(BlockBackend *blk, void *buf, hwaddr size,
  76                                 Error **errp);
  77
  78/* Configuration helpers */
  79
  80bool blkconf_geometry(BlockConf *conf, int *trans,
  81                      unsigned cyls_max, unsigned heads_max, unsigned secs_max,
  82                      Error **errp);
  83void blkconf_blocksizes(BlockConf *conf);
  84bool blkconf_apply_backend_options(BlockConf *conf, bool readonly,
  85                                   bool resizable, Error **errp);
  86
  87/* Hard disk geometry */
  88
  89void hd_geometry_guess(BlockBackend *blk,
  90                       uint32_t *pcyls, uint32_t *pheads, uint32_t *psecs,
  91                       int *ptrans);
  92int hd_bios_chs_auto_trans(uint32_t cyls, uint32_t heads, uint32_t secs);
  93
  94#endif
  95