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 "qemu-common.h"
  15
  16/* Configuration */
  17
  18typedef struct BlockConf {
  19    BlockBackend *blk;
  20    uint16_t physical_block_size;
  21    uint16_t logical_block_size;
  22    uint16_t min_io_size;
  23    uint32_t opt_io_size;
  24    int32_t bootindex;
  25    uint32_t discard_granularity;
  26    /* geometry, not all devices use this */
  27    uint32_t cyls, heads, secs;
  28    OnOffAuto wce;
  29    BlockdevOnError rerror;
  30    BlockdevOnError werror;
  31} BlockConf;
  32
  33static inline unsigned int get_physical_block_exp(BlockConf *conf)
  34{
  35    unsigned int exp = 0, size;
  36
  37    for (size = conf->physical_block_size;
  38        size > conf->logical_block_size;
  39        size >>= 1) {
  40        exp++;
  41    }
  42
  43    return exp;
  44}
  45
  46#define DEFINE_BLOCK_PROPERTIES(_state, _conf)                          \
  47    DEFINE_PROP_DRIVE("drive", _state, _conf.blk),                      \
  48    DEFINE_PROP_BLOCKSIZE("logical_block_size", _state,                 \
  49                          _conf.logical_block_size),                    \
  50    DEFINE_PROP_BLOCKSIZE("physical_block_size", _state,                \
  51                          _conf.physical_block_size),                   \
  52    DEFINE_PROP_UINT16("min_io_size", _state, _conf.min_io_size, 0),  \
  53    DEFINE_PROP_UINT32("opt_io_size", _state, _conf.opt_io_size, 0),    \
  54    DEFINE_PROP_UINT32("discard_granularity", _state, \
  55                       _conf.discard_granularity, -1), \
  56    DEFINE_PROP_ON_OFF_AUTO("write-cache", _state, _conf.wce, ON_OFF_AUTO_AUTO)
  57
  58#define DEFINE_BLOCK_CHS_PROPERTIES(_state, _conf)      \
  59    DEFINE_PROP_UINT32("cyls", _state, _conf.cyls, 0),  \
  60    DEFINE_PROP_UINT32("heads", _state, _conf.heads, 0), \
  61    DEFINE_PROP_UINT32("secs", _state, _conf.secs, 0)
  62
  63#define DEFINE_BLOCK_ERROR_PROPERTIES(_state, _conf)                    \
  64    DEFINE_PROP_BLOCKDEV_ON_ERROR("rerror", _state, _conf.rerror,       \
  65                                  BLOCKDEV_ON_ERROR_AUTO),              \
  66    DEFINE_PROP_BLOCKDEV_ON_ERROR("werror", _state, _conf.werror,       \
  67                                  BLOCKDEV_ON_ERROR_AUTO)
  68
  69/* Configuration helpers */
  70
  71void blkconf_serial(BlockConf *conf, char **serial);
  72void blkconf_geometry(BlockConf *conf, int *trans,
  73                      unsigned cyls_max, unsigned heads_max, unsigned secs_max,
  74                      Error **errp);
  75void blkconf_blocksizes(BlockConf *conf);
  76void blkconf_apply_backend_options(BlockConf *conf);
  77
  78/* Hard disk geometry */
  79
  80void hd_geometry_guess(BlockBackend *blk,
  81                       uint32_t *pcyls, uint32_t *pheads, uint32_t *psecs,
  82                       int *ptrans);
  83int hd_bios_chs_auto_trans(uint32_t cyls, uint32_t heads, uint32_t secs);
  84
  85#endif
  86