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    uint32_t lcyls, lheads, lsecs;
  30    OnOffAuto wce;
  31    bool share_rw;
  32    BlockdevOnError rerror;
  33    BlockdevOnError werror;
  34} BlockConf;
  35
  36static inline unsigned int get_physical_block_exp(BlockConf *conf)
  37{
  38    unsigned int exp = 0, size;
  39
  40    for (size = conf->physical_block_size;
  41        size > conf->logical_block_size;
  42        size >>= 1) {
  43        exp++;
  44    }
  45
  46    return exp;
  47}
  48
  49#define DEFINE_BLOCK_PROPERTIES_BASE(_state, _conf)                     \
  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_PROPERTIES(_state, _conf)                          \
  63    DEFINE_PROP_DRIVE("drive", _state, _conf.blk),                      \
  64    DEFINE_BLOCK_PROPERTIES_BASE(_state, _conf)
  65
  66#define DEFINE_BLOCK_CHS_PROPERTIES(_state, _conf)                      \
  67    DEFINE_PROP_UINT32("cyls", _state, _conf.cyls, 0),                  \
  68    DEFINE_PROP_UINT32("heads", _state, _conf.heads, 0),                \
  69    DEFINE_PROP_UINT32("secs", _state, _conf.secs, 0),                  \
  70    DEFINE_PROP_UINT32("lcyls", _state, _conf.lcyls, 0),                \
  71    DEFINE_PROP_UINT32("lheads", _state, _conf.lheads, 0),              \
  72    DEFINE_PROP_UINT32("lsecs", _state, _conf.lsecs, 0)
  73
  74#define DEFINE_BLOCK_ERROR_PROPERTIES(_state, _conf)                    \
  75    DEFINE_PROP_BLOCKDEV_ON_ERROR("rerror", _state, _conf.rerror,       \
  76                                  BLOCKDEV_ON_ERROR_AUTO),              \
  77    DEFINE_PROP_BLOCKDEV_ON_ERROR("werror", _state, _conf.werror,       \
  78                                  BLOCKDEV_ON_ERROR_AUTO)
  79
  80/* Backend access helpers */
  81
  82bool blk_check_size_and_read_all(BlockBackend *blk, void *buf, hwaddr size,
  83                                 Error **errp);
  84
  85/* Configuration helpers */
  86
  87bool blkconf_geometry(BlockConf *conf, int *trans,
  88                      unsigned cyls_max, unsigned heads_max, unsigned secs_max,
  89                      Error **errp);
  90void blkconf_blocksizes(BlockConf *conf);
  91bool blkconf_apply_backend_options(BlockConf *conf, bool readonly,
  92                                   bool resizable, Error **errp);
  93
  94/* Hard disk geometry */
  95
  96void hd_geometry_guess(BlockBackend *blk,
  97                       uint32_t *pcyls, uint32_t *pheads, uint32_t *psecs,
  98                       int *ptrans);
  99int hd_bios_chs_auto_trans(uint32_t cyls, uint32_t heads, uint32_t secs);
 100
 101#endif
 102