ide: Update ide_drive_get to be HBA agnostic
Instead of duplicating the logic for the if_ide
(bus,unit) mappings, rely on the blockdev layer
for managing those mappings for us, and use the
drive_get_by_index call instead.
This allows ide_drive_get to work for AHCI HBAs
as well, and can be used in the Q35 initialization.
Lastly, change the nature of the argument to
ide_drive_get so that represents the number of
total drives we can support, and not the total
number of buses. This will prevent array overflows
if the units-per-default-bus property ever needs
to be adjusted for compatibility reasons.
Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Message-id: 1412187569-23452-5-git-send-email-jsnow@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
diff --git a/blockdev.c b/blockdev.c
index 1780d77..e595910 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -135,6 +135,23 @@
}
}
+/**
+ * Returns the current mapping of how many units per bus
+ * a particular interface can support.
+ *
+ * A positive integer indicates n units per bus.
+ * 0 implies the mapping has not been established.
+ * -1 indicates an invalid BlockInterfaceType was given.
+ */
+int drive_get_max_devs(BlockInterfaceType type)
+{
+ if (type >= IF_IDE && type < IF_COUNT) {
+ return if_max_devs[type];
+ }
+
+ return -1;
+}
+
static int drive_index_to_bus_id(BlockInterfaceType type, int index)
{
int max_devs = if_max_devs[type];
