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
  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     uint32_t lcyls, lheads, lsecs;
  30     OnOffAuto wce;
  31     bool share_rw;
  32     BlockdevOnError rerror;
  33     BlockdevOnError werror;
  34 } BlockConf;
  35
  36 static inline unsigned int get_physical_block_exp(BlockConf *conf)
  37 {
  38     unsigned int exp = 0, size;
  39
  40     for (size = conf->physical_block_size;
  41         size > conf->logical_block_size;
  42         size >>= 1) {
  43         exp++;
  44     }
  45
  46     return exp;
  47 }
  48
  49 #define DEFINE_BLOCK_PROPERTIES_BASE(_state, _conf)                     \
  50     DEFINE_PROP_BLOCKSIZE("logical_block_size", _state,                 \
  51                           _conf.logical_block_size),                    \
  52     DEFINE_PROP_BLOCKSIZE("physical_block_size", _state,                \
  53                           _conf.physical_block_size),                   \
  54     DEFINE_PROP_UINT16("min_io_size", _state, _conf.min_io_size, 0),    \
  55     DEFINE_PROP_UINT32("opt_io_size", _state, _conf.opt_io_size, 0),    \
  56     DEFINE_PROP_UINT32("discard_granularity", _state,                   \
  57                        _conf.discard_granularity, -1),                  \
  58     DEFINE_PROP_ON_OFF_AUTO("write-cache", _state, _conf.wce,           \
  59                             ON_OFF_AUTO_AUTO),                          \
  60     DEFINE_PROP_BOOL("share-rw", _state, _conf.share_rw, false)
  61
  62 #define DEFINE_BLOCK_PROPERTIES(_state, _conf)                          \
  63     DEFINE_PROP_DRIVE("drive", _state, _conf.blk),                      \
  64     DEFINE_BLOCK_PROPERTIES_BASE(_state, _conf)
  65
  66 #define DEFINE_BLOCK_CHS_PROPERTIES(_state, _conf)                      \
  67     DEFINE_PROP_UINT32("cyls", _state, _conf.cyls, 0),                  \
  68     DEFINE_PROP_UINT32("heads", _state, _conf.heads, 0),                \
  69     DEFINE_PROP_UINT32("secs", _state, _conf.secs, 0),                  \
  70     DEFINE_PROP_UINT32("lcyls", _state, _conf.lcyls, 0),                \
  71     DEFINE_PROP_UINT32("lheads", _state, _conf.lheads, 0),              \
  72     DEFINE_PROP_UINT32("lsecs", _state, _conf.lsecs, 0)
  73
  74 #define DEFINE_BLOCK_ERROR_PROPERTIES(_state, _conf)                    \
  75     DEFINE_PROP_BLOCKDEV_ON_ERROR("rerror", _state, _conf.rerror,       \
  76                                   BLOCKDEV_ON_ERROR_AUTO),              \
  77     DEFINE_PROP_BLOCKDEV_ON_ERROR("werror", _state, _conf.werror,       \
  78                                   BLOCKDEV_ON_ERROR_AUTO)
  79
  80 /* Backend access helpers */
  81
  82 bool blk_check_size_and_read_all(BlockBackend *blk, void *buf, hwaddr size,
  83                                  Error **errp);
  84
  85 /* Configuration helpers */
  86
  87 bool blkconf_geometry(BlockConf *conf, int *trans,
  88                       unsigned cyls_max, unsigned heads_max, unsigned secs_max,
  89                       Error **errp);
  90 void blkconf_blocksizes(BlockConf *conf);
  91 bool blkconf_apply_backend_options(BlockConf *conf, bool readonly,
  92                                    bool resizable, Error **errp);
  93
  94 /* Hard disk geometry */
  95
  96 void hd_geometry_guess(BlockBackend *blk,
  97                        uint32_t *pcyls, uint32_t *pheads, uint32_t *psecs,
  98                        int *ptrans);
  99 int hd_bios_chs_auto_trans(uint32_t cyls, uint32_t heads, uint32_t secs);
 100
 101 #endif