rapidio: update enumerator registration mechanism
Update enumeration/discovery method registration mechanism to allow
loading enumeration/discovery methods before all mports are registered.
Existing statically linked RapidIO subsystem expects that all available
RapidIO mport devices are initialized and registered before the
enumeration/discovery method is registered. Switching to loadable mport
device drivers creates situation when mport device driver can be loaded
after enumeration/discovery method is attached (e.g., loadable mport
driver in a system with statically linked RapidIO core and enumerator).
This also will happen in a system with hot-pluggable RapidIO controllers.
To remove the dependency on the initialization/registration order this
patch introduces enumeration/discovery registration mechanism that
supports arbitrary registration order of mports and enumerator/discovery
methods.
The following registration rules are implemented:
- only one enumeration/discovery method can be registered for given mport ID
(including RIO_MPORT_ANY);
- when new enumeration/discovery methods tries to attach to the registered mport
device, method with matching mport ID will replace a default method previously
registered for given mport (if any);
- enumeration/discovery method with target ID=RIO_MPORT_ANY will be attached
only to mports that do not have another enumerator attached to them;
- when new mport device is registered with RapidIO subsystem, registration
routine searches for the enumeration/discovery method with the best matching
mport ID;
Signed-off-by: Alexandre Bounine <alexandre.bounine@idt.com>
Cc: Matt Porter <mporter@kernel.crashing.org>
Cc: Li Yang <leoli@freescale.com>
Cc: Kumar Gala <galak@kernel.crashing.org>
Cc: Andre van Herk <andre.van.herk@Prodrive.nl>
Cc: Micha Nelissen <micha.nelissen@Prodrive.nl>
Cc: Stef van Os <stef.van.os@Prodrive.nl>
Cc: Jean Delvare <jdelvare@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/rapidio/rio.h b/drivers/rapidio/rio.h
index d595877..085215c 100644
--- a/drivers/rapidio/rio.h
+++ b/drivers/rapidio/rio.h
@@ -42,9 +42,10 @@
extern int rio_enable_rx_tx_port(struct rio_mport *port, int local, u16 destid,
u8 hopcount, u8 port_num);
extern int rio_register_scan(int mport_id, struct rio_scan *scan_ops);
-extern int rio_unregister_scan(int mport_id);
+extern int rio_unregister_scan(int mport_id, struct rio_scan *scan_ops);
extern void rio_attach_device(struct rio_dev *rdev);
extern struct rio_mport *rio_find_mport(int mport_id);
+extern int rio_mport_scan(int mport_id);
/* Structures internal to the RIO core code */
extern struct device_attribute rio_dev_attrs[];