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 #include "qapi/error.h"
  16
  17 /* Configuration */
  18
  19 typedef 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 } BlockConf;
  30
  31 static inline unsigned int get_physical_block_exp(BlockConf *conf)
  32 {
  33     unsigned int exp = 0, size;
  34
  35     for (size = conf->physical_block_size;
  36         size > conf->logical_block_size;
  37         size >>= 1) {
  38         exp++;
  39     }
  40
  41     return exp;
  42 }
  43
  44 #define DEFINE_BLOCK_PROPERTIES(_state, _conf)                          \
  45     DEFINE_PROP_DRIVE("drive", _state, _conf.blk),                      \
  46     DEFINE_PROP_BLOCKSIZE("logical_block_size", _state,                 \
  47                           _conf.logical_block_size),                    \
  48     DEFINE_PROP_BLOCKSIZE("physical_block_size", _state,                \
  49                           _conf.physical_block_size),                   \
  50     DEFINE_PROP_UINT16("min_io_size", _state, _conf.min_io_size, 0),  \
  51     DEFINE_PROP_UINT32("opt_io_size", _state, _conf.opt_io_size, 0),    \
  52     DEFINE_PROP_UINT32("discard_granularity", _state, \
  53                        _conf.discard_granularity, -1)
  54
  55 #define DEFINE_BLOCK_CHS_PROPERTIES(_state, _conf)      \
  56     DEFINE_PROP_UINT32("cyls", _state, _conf.cyls, 0),  \
  57     DEFINE_PROP_UINT32("heads", _state, _conf.heads, 0), \
  58     DEFINE_PROP_UINT32("secs", _state, _conf.secs, 0)
  59
  60 /* Configuration helpers */
  61
  62 void blkconf_serial(BlockConf *conf, char **serial);
  63 void blkconf_geometry(BlockConf *conf, int *trans,
  64                       unsigned cyls_max, unsigned heads_max, unsigned secs_max,
  65                       Error **errp);
  66 void blkconf_blocksizes(BlockConf *conf);
  67
  68 /* Hard disk geometry */
  69
  70 void hd_geometry_guess(BlockBackend *blk,
  71                        uint32_t *pcyls, uint32_t *pheads, uint32_t *psecs,
  72                        int *ptrans);
  73 int hd_bios_chs_auto_trans(uint32_t cyls, uint32_t heads, uint32_t secs);
  74
  75 #endif