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_COMMON_H
  12#define HW_BLOCK_COMMON_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} BlockConf;
  29
  30static inline unsigned int get_physical_block_exp(BlockConf *conf)
  31{
  32    unsigned int exp = 0, size;
  33
  34    for (size = conf->physical_block_size;
  35        size > conf->logical_block_size;
  36        size >>= 1) {
  37        exp++;
  38    }
  39
  40    return exp;
  41}
  42
  43#define DEFINE_BLOCK_PROPERTIES(_state, _conf)                          \
  44    DEFINE_PROP_DRIVE("drive", _state, _conf.blk),                      \
  45    DEFINE_PROP_BLOCKSIZE("logical_block_size", _state,                 \
  46                          _conf.logical_block_size),                    \
  47    DEFINE_PROP_BLOCKSIZE("physical_block_size", _state,                \
  48                          _conf.physical_block_size),                   \
  49    DEFINE_PROP_UINT16("min_io_size", _state, _conf.min_io_size, 0),  \
  50    DEFINE_PROP_UINT32("opt_io_size", _state, _conf.opt_io_size, 0),    \
  51    DEFINE_PROP_UINT32("discard_granularity", _state, \
  52                       _conf.discard_granularity, -1)
  53
  54#define DEFINE_BLOCK_CHS_PROPERTIES(_state, _conf)      \
  55    DEFINE_PROP_UINT32("cyls", _state, _conf.cyls, 0),  \
  56    DEFINE_PROP_UINT32("heads", _state, _conf.heads, 0), \
  57    DEFINE_PROP_UINT32("secs", _state, _conf.secs, 0)
  58
  59/* Configuration helpers */
  60
  61void blkconf_serial(BlockConf *conf, char **serial);
  62void blkconf_geometry(BlockConf *conf, int *trans,
  63                      unsigned cyls_max, unsigned heads_max, unsigned secs_max,
  64                      Error **errp);
  65void blkconf_blocksizes(BlockConf *conf);
  66
  67/* Hard disk geometry */
  68
  69void hd_geometry_guess(BlockBackend *blk,
  70                       uint32_t *pcyls, uint32_t *pheads, uint32_t *psecs,
  71                       int *ptrans);
  72int hd_bios_chs_auto_trans(uint32_t cyls, uint32_t heads, uint32_t secs);
  73
  74#endif
  75