LXR qemu/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 "qemu/osdep.h"
  11#include "sysemu/blockdev.h"
  12#include "sysemu/block-backend.h"
  13#include "hw/block/block.h"
  14#include "qapi/error.h"
  15#include "qemu/error-report.h"
  16
  17void blkconf_serial(BlockConf *conf, char **serial)
  18{
  19    DriveInfo *dinfo;
  20
  21    if (!*serial) {
  22        /* try to fall back to value set with legacy -drive serial=... */
  23        dinfo = blk_legacy_dinfo(conf->blk);
  24        if (dinfo) {
  25            *serial = g_strdup(dinfo->serial);
  26        }
  27    }
  28}
  29
  30void blkconf_blocksizes(BlockConf *conf)
  31{
  32    BlockBackend *blk = conf->blk;
  33    BlockSizes blocksizes;
  34    int backend_ret;
  35
  36    backend_ret = blk_probe_blocksizes(blk, &blocksizes);
  37    /* fill in detected values if they are not defined via qemu command line */
  38    if (!conf->physical_block_size) {
  39        if (!backend_ret) {
  40           conf->physical_block_size = blocksizes.phys;
  41        } else {
  42            conf->physical_block_size = BDRV_SECTOR_SIZE;
  43        }
  44    }
  45    if (!conf->logical_block_size) {
  46        if (!backend_ret) {
  47            conf->logical_block_size = blocksizes.log;
  48        } else {
  49            conf->logical_block_size = BDRV_SECTOR_SIZE;
  50        }
  51    }
  52}
  53
  54void blkconf_geometry(BlockConf *conf, int *ptrans,
  55                      unsigned cyls_max, unsigned heads_max, unsigned secs_max,
  56                      Error **errp)
  57{
  58    DriveInfo *dinfo;
  59
  60    if (!conf->cyls && !conf->heads && !conf->secs) {
  61        /* try to fall back to value set with legacy -drive cyls=... */
  62        dinfo = blk_legacy_dinfo(conf->blk);
  63        if (dinfo) {
  64            conf->cyls  = dinfo->cyls;
  65            conf->heads = dinfo->heads;
  66            conf->secs  = dinfo->secs;
  67            if (ptrans) {
  68                *ptrans = dinfo->trans;
  69            }
  70        }
  71    }
  72    if (!conf->cyls && !conf->heads && !conf->secs) {
  73        hd_geometry_guess(conf->blk,
  74                          &conf->cyls, &conf->heads, &conf->secs,
  75                          ptrans);
  76    } else if (ptrans && *ptrans == BIOS_ATA_TRANSLATION_AUTO) {
  77        *ptrans = hd_bios_chs_auto_trans(conf->cyls, conf->heads, conf->secs);
  78    }
  79    if (conf->cyls || conf->heads || conf->secs) {
  80        if (conf->cyls < 1 || conf->cyls > cyls_max) {
  81            error_setg(errp, "cyls must be between 1 and %u", cyls_max);
  82            return;
  83        }
  84        if (conf->heads < 1 || conf->heads > heads_max) {
  85            error_setg(errp, "heads must be between 1 and %u", heads_max);
  86            return;
  87        }
  88        if (conf->secs < 1 || conf->secs > secs_max) {
  89            error_setg(errp, "secs must be between 1 and %u", secs_max);
  90            return;
  91        }
  92    }
  93}
  94