64d032ba43
In preparation for supporting greater than 64 partitions replace partid_t by short in drivers/misc/sgi-xp. Signed-off-by: Dean Nelson <dcn@sgi.com> Acked-by: Robin Holt <holt@sgi.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
280 lines
8.1 KiB
C
280 lines
8.1 KiB
C
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (c) 2004-2008 Silicon Graphics, Inc. All Rights Reserved.
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*/
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/*
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* Cross Partition (XP) base.
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*
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* XP provides a base from which its users can interact
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* with XPC, yet not be dependent on XPC.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/interrupt.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <asm/sn/intr.h>
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#include <asm/sn/sn_sal.h>
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#include "xp.h"
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/*
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* The export of xp_nofault_PIOR needs to happen here since it is defined
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* in drivers/misc/sgi-xp/xp_nofault.S. The target of the nofault read is
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* defined here.
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*/
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EXPORT_SYMBOL_GPL(xp_nofault_PIOR);
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u64 xp_nofault_PIOR_target;
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EXPORT_SYMBOL_GPL(xp_nofault_PIOR_target);
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/*
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* xpc_registrations[] keeps track of xpc_connect()'s done by the kernel-level
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* users of XPC.
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*/
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struct xpc_registration xpc_registrations[XPC_NCHANNELS];
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EXPORT_SYMBOL_GPL(xpc_registrations);
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/*
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* Initialize the XPC interface to indicate that XPC isn't loaded.
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*/
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static enum xp_retval
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xpc_notloaded(void)
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{
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return xpNotLoaded;
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}
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struct xpc_interface xpc_interface = {
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(void (*)(int))xpc_notloaded,
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(void (*)(int))xpc_notloaded,
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(enum xp_retval(*)(short, int, u32, void **))xpc_notloaded,
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(enum xp_retval(*)(short, int, void *))xpc_notloaded,
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(enum xp_retval(*)(short, int, void *, xpc_notify_func, void *))
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xpc_notloaded,
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(void (*)(short, int, void *))xpc_notloaded,
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(enum xp_retval(*)(short, void *))xpc_notloaded
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};
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EXPORT_SYMBOL_GPL(xpc_interface);
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/*
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* XPC calls this when it (the XPC module) has been loaded.
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*/
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void
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xpc_set_interface(void (*connect) (int),
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void (*disconnect) (int),
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enum xp_retval (*allocate) (short, int, u32, void **),
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enum xp_retval (*send) (short, int, void *),
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enum xp_retval (*send_notify) (short, int, void *,
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xpc_notify_func, void *),
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void (*received) (short, int, void *),
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enum xp_retval (*partid_to_nasids) (short, void *))
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{
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xpc_interface.connect = connect;
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xpc_interface.disconnect = disconnect;
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xpc_interface.allocate = allocate;
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xpc_interface.send = send;
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xpc_interface.send_notify = send_notify;
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xpc_interface.received = received;
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xpc_interface.partid_to_nasids = partid_to_nasids;
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}
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EXPORT_SYMBOL_GPL(xpc_set_interface);
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/*
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* XPC calls this when it (the XPC module) is being unloaded.
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*/
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void
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xpc_clear_interface(void)
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{
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xpc_interface.connect = (void (*)(int))xpc_notloaded;
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xpc_interface.disconnect = (void (*)(int))xpc_notloaded;
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xpc_interface.allocate = (enum xp_retval(*)(short, int, u32,
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void **))xpc_notloaded;
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xpc_interface.send = (enum xp_retval(*)(short, int, void *))
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xpc_notloaded;
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xpc_interface.send_notify = (enum xp_retval(*)(short, int, void *,
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xpc_notify_func,
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void *))xpc_notloaded;
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xpc_interface.received = (void (*)(short, int, void *))
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xpc_notloaded;
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xpc_interface.partid_to_nasids = (enum xp_retval(*)(short, void *))
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xpc_notloaded;
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}
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EXPORT_SYMBOL_GPL(xpc_clear_interface);
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/*
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* Register for automatic establishment of a channel connection whenever
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* a partition comes up.
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*
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* Arguments:
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*
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* ch_number - channel # to register for connection.
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* func - function to call for asynchronous notification of channel
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* state changes (i.e., connection, disconnection, error) and
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* the arrival of incoming messages.
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* key - pointer to optional user-defined value that gets passed back
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* to the user on any callouts made to func.
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* payload_size - size in bytes of the XPC message's payload area which
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* contains a user-defined message. The user should make
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* this large enough to hold their largest message.
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* nentries - max #of XPC message entries a message queue can contain.
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* The actual number, which is determined when a connection
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* is established and may be less then requested, will be
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* passed to the user via the xpConnected callout.
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* assigned_limit - max number of kthreads allowed to be processing
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* messages (per connection) at any given instant.
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* idle_limit - max number of kthreads allowed to be idle at any given
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* instant.
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*/
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enum xp_retval
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xpc_connect(int ch_number, xpc_channel_func func, void *key, u16 payload_size,
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u16 nentries, u32 assigned_limit, u32 idle_limit)
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{
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struct xpc_registration *registration;
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DBUG_ON(ch_number < 0 || ch_number >= XPC_NCHANNELS);
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DBUG_ON(payload_size == 0 || nentries == 0);
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DBUG_ON(func == NULL);
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DBUG_ON(assigned_limit == 0 || idle_limit > assigned_limit);
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registration = &xpc_registrations[ch_number];
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if (mutex_lock_interruptible(®istration->mutex) != 0)
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return xpInterrupted;
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/* if XPC_CHANNEL_REGISTERED(ch_number) */
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if (registration->func != NULL) {
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mutex_unlock(®istration->mutex);
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return xpAlreadyRegistered;
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}
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/* register the channel for connection */
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registration->msg_size = XPC_MSG_SIZE(payload_size);
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registration->nentries = nentries;
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registration->assigned_limit = assigned_limit;
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registration->idle_limit = idle_limit;
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registration->key = key;
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registration->func = func;
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mutex_unlock(®istration->mutex);
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xpc_interface.connect(ch_number);
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return xpSuccess;
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}
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EXPORT_SYMBOL_GPL(xpc_connect);
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/*
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* Remove the registration for automatic connection of the specified channel
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* when a partition comes up.
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*
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* Before returning this xpc_disconnect() will wait for all connections on the
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* specified channel have been closed/torndown. So the caller can be assured
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* that they will not be receiving any more callouts from XPC to their
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* function registered via xpc_connect().
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*
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* Arguments:
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*
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* ch_number - channel # to unregister.
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*/
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void
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xpc_disconnect(int ch_number)
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{
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struct xpc_registration *registration;
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DBUG_ON(ch_number < 0 || ch_number >= XPC_NCHANNELS);
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registration = &xpc_registrations[ch_number];
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/*
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* We've decided not to make this a down_interruptible(), since we
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* figured XPC's users will just turn around and call xpc_disconnect()
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* again anyways, so we might as well wait, if need be.
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*/
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mutex_lock(®istration->mutex);
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/* if !XPC_CHANNEL_REGISTERED(ch_number) */
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if (registration->func == NULL) {
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mutex_unlock(®istration->mutex);
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return;
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}
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/* remove the connection registration for the specified channel */
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registration->func = NULL;
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registration->key = NULL;
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registration->nentries = 0;
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registration->msg_size = 0;
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registration->assigned_limit = 0;
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registration->idle_limit = 0;
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xpc_interface.disconnect(ch_number);
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mutex_unlock(®istration->mutex);
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return;
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}
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EXPORT_SYMBOL_GPL(xpc_disconnect);
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int __init
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xp_init(void)
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{
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int ret, ch_number;
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u64 func_addr = *(u64 *)xp_nofault_PIOR;
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u64 err_func_addr = *(u64 *)xp_error_PIOR;
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if (!ia64_platform_is("sn2"))
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return -ENODEV;
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/*
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* Register a nofault code region which performs a cross-partition
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* PIO read. If the PIO read times out, the MCA handler will consume
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* the error and return to a kernel-provided instruction to indicate
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* an error. This PIO read exists because it is guaranteed to timeout
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* if the destination is down (AMO operations do not timeout on at
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* least some CPUs on Shubs <= v1.2, which unfortunately we have to
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* work around).
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*/
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ret = sn_register_nofault_code(func_addr, err_func_addr, err_func_addr,
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1, 1);
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if (ret != 0) {
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printk(KERN_ERR "XP: can't register nofault code, error=%d\n",
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ret);
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}
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/*
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* Setup the nofault PIO read target. (There is no special reason why
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* SH_IPI_ACCESS was selected.)
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*/
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if (is_shub2())
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xp_nofault_PIOR_target = SH2_IPI_ACCESS0;
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else
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xp_nofault_PIOR_target = SH1_IPI_ACCESS;
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/* initialize the connection registration mutex */
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for (ch_number = 0; ch_number < XPC_NCHANNELS; ch_number++)
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mutex_init(&xpc_registrations[ch_number].mutex);
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return 0;
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}
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module_init(xp_init);
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void __exit
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xp_exit(void)
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{
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u64 func_addr = *(u64 *)xp_nofault_PIOR;
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u64 err_func_addr = *(u64 *)xp_error_PIOR;
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/* unregister the PIO read nofault code region */
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(void)sn_register_nofault_code(func_addr, err_func_addr,
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err_func_addr, 1, 0);
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}
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module_exit(xp_exit);
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MODULE_AUTHOR("Silicon Graphics, Inc.");
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MODULE_DESCRIPTION("Cross Partition (XP) base");
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MODULE_LICENSE("GPL");
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