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 "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     OnOffAuto wce;
  29     BlockdevOnError rerror;
  30     BlockdevOnError werror;
  31 } BlockConf;
  32
  33 static inline unsigned int get_physical_block_exp(BlockConf *conf)
  34 {
  35     unsigned int exp = 0, size;
  36
  37     for (size = conf->physical_block_size;
  38         size > conf->logical_block_size;
  39         size >>= 1) {
  40         exp++;
  41     }
  42
  43     return exp;
  44 }
  45
  46 #define DEFINE_BLOCK_PROPERTIES(_state, _conf)                          \
  47     DEFINE_PROP_DRIVE("drive", _state, _conf.blk),                      \
  48     DEFINE_PROP_BLOCKSIZE("logical_block_size", _state,                 \
  49                           _conf.logical_block_size),                    \
  50     DEFINE_PROP_BLOCKSIZE("physical_block_size", _state,                \
  51                           _conf.physical_block_size),                   \
  52     DEFINE_PROP_UINT16("min_io_size", _state, _conf.min_io_size, 0),  \
  53     DEFINE_PROP_UINT32("opt_io_size", _state, _conf.opt_io_size, 0),    \
  54     DEFINE_PROP_UINT32("discard_granularity", _state, \
  55                        _conf.discard_granularity, -1), \
  56     DEFINE_PROP_ON_OFF_AUTO("write-cache", _state, _conf.wce, ON_OFF_AUTO_AUTO)
  57
  58 #define DEFINE_BLOCK_CHS_PROPERTIES(_state, _conf)      \
  59     DEFINE_PROP_UINT32("cyls", _state, _conf.cyls, 0),  \
  60     DEFINE_PROP_UINT32("heads", _state, _conf.heads, 0), \
  61     DEFINE_PROP_UINT32("secs", _state, _conf.secs, 0)
  62
  63 #define DEFINE_BLOCK_ERROR_PROPERTIES(_state, _conf)                    \
  64     DEFINE_PROP_BLOCKDEV_ON_ERROR("rerror", _state, _conf.rerror,       \
  65                                   BLOCKDEV_ON_ERROR_AUTO),              \
  66     DEFINE_PROP_BLOCKDEV_ON_ERROR("werror", _state, _conf.werror,       \
  67                                   BLOCKDEV_ON_ERROR_AUTO)
  68
  69 /* Configuration helpers */
  70
  71 void blkconf_serial(BlockConf *conf, char **serial);
  72 void blkconf_geometry(BlockConf *conf, int *trans,
  73                       unsigned cyls_max, unsigned heads_max, unsigned secs_max,
  74                       Error **errp);
  75 void blkconf_blocksizes(BlockConf *conf);
  76 void blkconf_apply_backend_options(BlockConf *conf);
  77
  78 /* Hard disk geometry */
  79
  80 void hd_geometry_guess(BlockBackend *blk,
  81                        uint32_t *pcyls, uint32_t *pheads, uint32_t *psecs,
  82                        int *ptrans);
  83 int hd_bios_chs_auto_trans(uint32_t cyls, uint32_t heads, uint32_t secs);
  84
  85 #endif