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fdc: add pick_drive

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Split apart pick_geometry by creating a pick_drive routine that will only
ever called during device bring-up instead of relying on pick_geometry to
be used in both cases.

With this change, the drive field is changed to be 'write once'. It is
not altered after the initialization routines exit.

media_validated does not need to be migrated. The target VM
will just revalidate the media on post_load anyway.

Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: John Snow <jsnow@redhat.com>
Message-id: 1453495865-9649-7-git-send-email-jsnow@redhat.com
This commit is contained in:
John Snow 2016-01-22 15:50:59 -05:00
parent 69ce1ac26d
commit d5d47efc85
1 changed files with 46 additions and 10 deletions
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56
hw/block/fdc.c
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@ -151,6 +151,7 @@ typedef struct FDrive {
uint8_t media_rate; /* Data rate of medium */
bool media_inserted; /* Is there a medium in the tray */
bool media_validated; /* Have we validated the media? */
} FDrive;
static void fd_init(FDrive *drv)
@ -162,6 +163,8 @@ static void fd_init(FDrive *drv)
drv->disk = FLOPPY_DRIVE_TYPE_NONE;
drv->last_sect = 0;
drv->max_track = 0;
drv->ro = true;
drv->media_changed = 1;
}
#define NUM_SIDES(drv) ((drv)->flags & FDISK_DBL_SIDES ? 2 : 1)
@ -244,13 +247,24 @@ static void fd_recalibrate(FDrive *drv)
fd_seek(drv, 0, 0, 1, 1);
}
static void pick_geometry(FDrive *drv)
/**
* Determine geometry based on inserted diskette.
* Will not operate on an empty drive.
*
* @return: 0 on success, -1 if the drive is empty.
*/
static int pick_geometry(FDrive *drv)
{
BlockBackend *blk = drv->blk;
const FDFormat *parse;
uint64_t nb_sectors, size;
int i, first_match, match;
/* We can only pick a geometry if we have a diskette. */
if (!drv->media_inserted) {
return -1;
}
blk_get_geometry(blk, &nb_sectors);
match = -1;
first_match = -1;
@ -290,31 +304,51 @@ static void pick_geometry(FDrive *drv)
}
drv->max_track = parse->max_track;
drv->last_sect = parse->last_sect;
drv->drive = parse->drive;
drv->disk = drv->media_inserted ? parse->drive : FLOPPY_DRIVE_TYPE_NONE;
drv->disk = parse->drive;
drv->media_rate = parse->rate;
return 0;
}
static void pick_drive_type(FDrive *drv)
{
if (pick_geometry(drv) == 0) {
drv->drive = drv->disk;
} else {
/* Legacy behavior: default to 1.44MB floppy */
drv->drive = FLOPPY_DRIVE_TYPE_144;
}
}
/* Revalidate a disk drive after a disk change */
static void fd_revalidate(FDrive *drv)
{
int rc;
FLOPPY_DPRINTF("revalidate\n");
if (drv->blk != NULL) {
drv->ro = blk_is_read_only(drv->blk);
pick_geometry(drv);
if (!drv->media_inserted) {
FLOPPY_DPRINTF("No disk in drive\n");
} else {
FLOPPY_DPRINTF("Floppy disk (%d h %d t %d s) %s\n",
(drv->flags & FDISK_DBL_SIDES) ? 2 : 1,
drv->max_track, drv->last_sect,
drv->ro ? "ro" : "rw");
drv->disk = FLOPPY_DRIVE_TYPE_NONE;
} else if (!drv->media_validated) {
rc = pick_geometry(drv);
if (rc) {
FLOPPY_DPRINTF("Could not validate floppy drive media");
} else {
drv->media_validated = true;
FLOPPY_DPRINTF("Floppy disk (%d h %d t %d s) %s\n",
(drv->flags & FDISK_DBL_SIDES) ? 2 : 1,
drv->max_track, drv->last_sect,
drv->ro ? "ro" : "rw");
}
}
} else {
FLOPPY_DPRINTF("No drive connected\n");
drv->last_sect = 0;
drv->max_track = 0;
drv->flags &= ~FDISK_DBL_SIDES;
drv->drive = FLOPPY_DRIVE_TYPE_NONE;
drv->disk = FLOPPY_DRIVE_TYPE_NONE;
}
}
@ -2185,6 +2219,7 @@ static void fdctrl_change_cb(void *opaque, bool load)
drive->media_inserted = load && drive->blk && blk_is_inserted(drive->blk);
drive->media_changed = 1;
drive->media_validated = false;
fd_revalidate(drive);
}
@ -2221,11 +2256,12 @@ static void fdctrl_connect_drives(FDCtrl *fdctrl, Error **errp)
}
fd_init(drive);
fdctrl_change_cb(drive, 0);
if (drive->blk) {
blk_set_dev_ops(drive->blk, &fdctrl_block_ops, drive);
drive->media_inserted = blk_is_inserted(drive->blk);
pick_drive_type(drive);
}
fd_revalidate(drive);
}
}