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 OnOffAuto wce; 30 bool share_rw; 31 BlockdevOnError rerror; 32 BlockdevOnError werror; 33 } BlockConf; 34 35 static inline unsigned int get_physical_block_exp(BlockConf *conf) 36 { 37 unsigned int exp = 0, size; 38 39 for (size = conf->physical_block_size; 40 size > conf->logical_block_size; 41 size >>= 1) { 42 exp++; 43 } 44 45 return exp; 46 } 47 48 #define DEFINE_BLOCK_PROPERTIES(_state, _conf) \ 49 DEFINE_PROP_DRIVE("drive", _state, _conf.blk), \ 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_CHS_PROPERTIES(_state, _conf) \ 63 DEFINE_PROP_UINT32("cyls", _state, _conf.cyls, 0), \ 64 DEFINE_PROP_UINT32("heads", _state, _conf.heads, 0), \ 65 DEFINE_PROP_UINT32("secs", _state, _conf.secs, 0) 66 67 #define DEFINE_BLOCK_ERROR_PROPERTIES(_state, _conf) \ 68 DEFINE_PROP_BLOCKDEV_ON_ERROR("rerror", _state, _conf.rerror, \ 69 BLOCKDEV_ON_ERROR_AUTO), \ 70 DEFINE_PROP_BLOCKDEV_ON_ERROR("werror", _state, _conf.werror, \ 71 BLOCKDEV_ON_ERROR_AUTO) 72 73 /* Backend access helpers */ 74 75 bool blk_check_size_and_read_all(BlockBackend *blk, void *buf, hwaddr size, 76 Error **errp); 77 78 /* Configuration helpers */ 79 80 bool blkconf_geometry(BlockConf *conf, int *trans, 81 unsigned cyls_max, unsigned heads_max, unsigned secs_max, 82 Error **errp); 83 void blkconf_blocksizes(BlockConf *conf); 84 bool blkconf_apply_backend_options(BlockConf *conf, bool readonly, 85 bool resizable, Error **errp); 86 87 /* Hard disk geometry */ 88 89 void hd_geometry_guess(BlockBackend *blk, 90 uint32_t *pcyls, uint32_t *pheads, uint32_t *psecs, 91 int *ptrans); 92 int hd_bios_chs_auto_trans(uint32_t cyls, uint32_t heads, uint32_t secs); 93 94 #endif 95