diff options
| -rw-r--r-- | blockdev.c | 26 | ||||
| -rw-r--r-- | include/sysemu/blockdev.h | 2 |
2 files changed, 27 insertions, 1 deletions
diff --git a/blockdev.c b/blockdev.c index 48da1a7e0f..1780d7723a 100644 --- a/blockdev.c +++ b/blockdev.c @@ -60,7 +60,7 @@ static const char *const if_name[IF_COUNT] = { [IF_XEN] = "xen", }; -static const int if_max_devs[IF_COUNT] = { +static int if_max_devs[IF_COUNT] = { /* * Do not change these numbers! They govern how drive option * index maps to unit and bus. That mapping is ABI. @@ -79,6 +79,30 @@ static const int if_max_devs[IF_COUNT] = { [IF_SCSI] = 7, }; +/** + * Boards may call this to offer board-by-board overrides + * of the default, global values. + */ +void override_max_devs(BlockInterfaceType type, int max_devs) +{ + DriveInfo *dinfo; + + if (max_devs <= 0) { + return; + } + + QTAILQ_FOREACH(dinfo, &drives, next) { + if (dinfo->type == type) { + fprintf(stderr, "Cannot override units-per-bus property of" + " the %s interface, because a drive of that type has" + " already been added.\n", if_name[type]); + g_assert_not_reached(); + } + } + + if_max_devs[type] = max_devs; +} + /* * We automatically delete the drive when a device using it gets * unplugged. Questionable feature, but we can't just drop it. diff --git a/include/sysemu/blockdev.h b/include/sysemu/blockdev.h index 30402867b9..a4033d4c29 100644 --- a/include/sysemu/blockdev.h +++ b/include/sysemu/blockdev.h @@ -46,6 +46,8 @@ struct DriveInfo { QTAILQ_ENTRY(DriveInfo) next; }; +void override_max_devs(BlockInterfaceType type, int max_devs); + DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit); bool drive_check_orphaned(void); DriveInfo *drive_get_by_index(BlockInterfaceType type, int index); |