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
  18 typedef 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
  30 static 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
  61 void blkconf_serial(BlockConf *conf, char **serial);
  62 void blkconf_geometry(BlockConf *conf, int *trans,
  63                       unsigned cyls_max, unsigned heads_max, unsigned secs_max,
  64                       Error **errp);
  65 void blkconf_blocksizes(BlockConf *conf);
  66
  67 /* Hard disk geometry */
  68
  69 void hd_geometry_guess(BlockBackend *blk,
  70                        uint32_t *pcyls, uint32_t *pheads, uint32_t *psecs,
  71                        int *ptrans);
  72 int hd_bios_chs_auto_trans(uint32_t cyls, uint32_t heads, uint32_t secs);
  73
  74 #endif