hw/block/block.c

   1 /*
   2  * Common code for block device models
   3  *
   4  * Copyright (C) 2012 Red Hat, Inc.
   5  *
   6  * This work is licensed under the terms of the GNU GPL, version 2 or
   7  * later.  See the COPYING file in the top-level directory.
   8  */
   9
  10 #include "sysemu/blockdev.h"
  11 #include "sysemu/block-backend.h"
  12 #include "hw/block/block.h"
  13 #include "qemu/error-report.h"
  14
  15 void blkconf_serial(BlockConf *conf, char **serial)
  16 {
  17     DriveInfo *dinfo;
  18
  19     if (!*serial) {
  20         /* try to fall back to value set with legacy -drive serial=... */
  21         dinfo = blk_legacy_dinfo(conf->blk);
  22         if (dinfo) {
  23             *serial = g_strdup(dinfo->serial);
  24         }
  25     }
  26 }
  27
  28 void blkconf_blocksizes(BlockConf *conf)
  29 {
  30     BlockBackend *blk = conf->blk;
  31     BlockSizes blocksizes;
  32     int backend_ret;
  33
  34     backend_ret = blk_probe_blocksizes(blk, &blocksizes);
  35     /* fill in detected values if they are not defined via qemu command line */
  36     if (!conf->physical_block_size) {
  37         if (!backend_ret) {
  38            conf->physical_block_size = blocksizes.phys;
  39         } else {
  40             conf->physical_block_size = BDRV_SECTOR_SIZE;
  41         }
  42     }
  43     if (!conf->logical_block_size) {
  44         if (!backend_ret) {
  45             conf->logical_block_size = blocksizes.log;
  46         } else {
  47             conf->logical_block_size = BDRV_SECTOR_SIZE;
  48         }
  49     }
  50 }
  51
  52 void blkconf_geometry(BlockConf *conf, int *ptrans,
  53                       unsigned cyls_max, unsigned heads_max, unsigned secs_max,
  54                       Error **errp)
  55 {
  56     DriveInfo *dinfo;
  57
  58     if (!conf->cyls && !conf->heads && !conf->secs) {
  59         /* try to fall back to value set with legacy -drive cyls=... */
  60         dinfo = blk_legacy_dinfo(conf->blk);
  61         if (dinfo) {
  62             conf->cyls  = dinfo->cyls;
  63             conf->heads = dinfo->heads;
  64             conf->secs  = dinfo->secs;
  65             if (ptrans) {
  66                 *ptrans = dinfo->trans;
  67             }
  68         }
  69     }
  70     if (!conf->cyls && !conf->heads && !conf->secs) {
  71         hd_geometry_guess(conf->blk,
  72                           &conf->cyls, &conf->heads, &conf->secs,
  73                           ptrans);
  74     } else if (ptrans && *ptrans == BIOS_ATA_TRANSLATION_AUTO) {
  75         *ptrans = hd_bios_chs_auto_trans(conf->cyls, conf->heads, conf->secs);
  76     }
  77     if (conf->cyls || conf->heads || conf->secs) {
  78         if (conf->cyls < 1 || conf->cyls > cyls_max) {
  79             error_setg(errp, "cyls must be between 1 and %u", cyls_max);
  80             return;
  81         }
  82         if (conf->heads < 1 || conf->heads > heads_max) {
  83             error_setg(errp, "heads must be between 1 and %u", heads_max);
  84             return;
  85         }
  86         if (conf->secs < 1 || conf->secs > secs_max) {
  87             error_setg(errp, "secs must be between 1 and %u", secs_max);
  88             return;
  89         }
  90     }
  91 }