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#include "hw/qdev-properties-system.h"
  17
  18/* Configuration */
  19
  20typedef struct BlockConf {
  21    BlockBackend *blk;
  22    uint32_t physical_block_size;
  23    uint32_t logical_block_size;
  24    uint32_t min_io_size;
  25    uint32_t opt_io_size;
  26    int32_t bootindex;
  27    uint32_t discard_granularity;
  28    /* geometry, not all devices use this */
  29    uint32_t cyls, heads, secs;
  30    uint32_t lcyls, lheads, lsecs;
  31    OnOffAuto wce;
  32    bool share_rw;
  33    BlockdevOnError rerror;
  34    BlockdevOnError werror;
  35} BlockConf;
  36
  37static inline unsigned int get_physical_block_exp(BlockConf *conf)
  38{
  39    unsigned int exp = 0, size;
  40
  41    for (size = conf->physical_block_size;
  42        size > conf->logical_block_size;
  43        size >>= 1) {
  44        exp++;
  45    }
  46
  47    return exp;
  48}
  49
  50#define DEFINE_BLOCK_PROPERTIES_BASE(_state, _conf)                     \
  51    DEFINE_PROP_BLOCKSIZE("logical_block_size", _state,                 \
  52                          _conf.logical_block_size),                    \
  53    DEFINE_PROP_BLOCKSIZE("physical_block_size", _state,                \
  54                          _conf.physical_block_size),                   \
  55    DEFINE_PROP_SIZE32("min_io_size", _state, _conf.min_io_size, 0),    \
  56    DEFINE_PROP_SIZE32("opt_io_size", _state, _conf.opt_io_size, 0),    \
  57    DEFINE_PROP_SIZE32("discard_granularity", _state,                   \
  58                       _conf.discard_granularity, -1),                  \
  59    DEFINE_PROP_ON_OFF_AUTO("write-cache", _state, _conf.wce,           \
  60                            ON_OFF_AUTO_AUTO),                          \
  61    DEFINE_PROP_BOOL("share-rw", _state, _conf.share_rw, false)
  62
  63#define DEFINE_BLOCK_PROPERTIES(_state, _conf)                          \
  64    DEFINE_PROP_DRIVE("drive", _state, _conf.blk),                      \
  65    DEFINE_BLOCK_PROPERTIES_BASE(_state, _conf)
  66
  67#define DEFINE_BLOCK_CHS_PROPERTIES(_state, _conf)                      \
  68    DEFINE_PROP_UINT32("cyls", _state, _conf.cyls, 0),                  \
  69    DEFINE_PROP_UINT32("heads", _state, _conf.heads, 0),                \
  70    DEFINE_PROP_UINT32("secs", _state, _conf.secs, 0),                  \
  71    DEFINE_PROP_UINT32("lcyls", _state, _conf.lcyls, 0),                \
  72    DEFINE_PROP_UINT32("lheads", _state, _conf.lheads, 0),              \
  73    DEFINE_PROP_UINT32("lsecs", _state, _conf.lsecs, 0)
  74
  75#define DEFINE_BLOCK_ERROR_PROPERTIES(_state, _conf)                    \
  76    DEFINE_PROP_BLOCKDEV_ON_ERROR("rerror", _state, _conf.rerror,       \
  77                                  BLOCKDEV_ON_ERROR_AUTO),              \
  78    DEFINE_PROP_BLOCKDEV_ON_ERROR("werror", _state, _conf.werror,       \
  79                                  BLOCKDEV_ON_ERROR_AUTO)
  80
  81/* Backend access helpers */
  82
  83bool blk_check_size_and_read_all(BlockBackend *blk, void *buf, hwaddr size,
  84                                 Error **errp);
  85
  86/* Configuration helpers */
  87
  88bool blkconf_geometry(BlockConf *conf, int *trans,
  89                      unsigned cyls_max, unsigned heads_max, unsigned secs_max,
  90                      Error **errp);
  91bool blkconf_blocksizes(BlockConf *conf, Error **errp);
  92bool blkconf_apply_backend_options(BlockConf *conf, bool readonly,
  93                                   bool resizable, Error **errp);
  94
  95/* Hard disk geometry */
  96
  97void hd_geometry_guess(BlockBackend *blk,
  98                       uint32_t *pcyls, uint32_t *pheads, uint32_t *psecs,
  99                       int *ptrans);
 100int hd_bios_chs_auto_trans(uint32_t cyls, uint32_t heads, uint32_t secs);
 101
 102#endif
 103