Moved, renamed, and deleted files

The original directory structure was scattered and unorganized.
Changes are basically to make it look like kernel structure.

1 files changed, 0 insertions, 1011 deletions

diff --git a/ANDROID_3.4.5/drivers/misc/sgi-xp/xpc_channel.c b/ANDROID_3.4.5/drivers/misc/sgi-xp/xpc_channel.c
deleted file mode 100644
index 652593fc..00000000
--- a/ANDROID_3.4.5/drivers/misc/sgi-xp/xpc_channel.c
+++ /dev/null
@@ -1,1011 +0,0 @@
-/*
- * This file is subject to the terms and conditions of the GNU General Public
- * License.  See the file "COPYING" in the main directory of this archive
- * for more details.
- *
- * Copyright (c) 2004-2009 Silicon Graphics, Inc.  All Rights Reserved.
- */
-
-/*
- * Cross Partition Communication (XPC) channel support.
- *
- *	This is the part of XPC that manages the channels and
- *	sends/receives messages across them to/from other partitions.
- *
- */
-
-#include <linux/device.h>
-#include "xpc.h"
-
-/*
- * Process a connect message from a remote partition.
- *
- * Note: xpc_process_connect() is expecting to be called with the
- * spin_lock_irqsave held and will leave it locked upon return.
- */
-static void
-xpc_process_connect(struct xpc_channel *ch, unsigned long *irq_flags)
-{
-	enum xp_retval ret;
-
-	DBUG_ON(!spin_is_locked(&ch->lock));
-
-	if (!(ch->flags & XPC_C_OPENREQUEST) ||
-	    !(ch->flags & XPC_C_ROPENREQUEST)) {
-		/* nothing more to do for now */
-		return;
-	}
-	DBUG_ON(!(ch->flags & XPC_C_CONNECTING));
-
-	if (!(ch->flags & XPC_C_SETUP)) {
-		spin_unlock_irqrestore(&ch->lock, *irq_flags);
-		ret = xpc_arch_ops.setup_msg_structures(ch);
-		spin_lock_irqsave(&ch->lock, *irq_flags);
-
-		if (ret != xpSuccess)
-			XPC_DISCONNECT_CHANNEL(ch, ret, irq_flags);
-		else
-			ch->flags |= XPC_C_SETUP;
-
-		if (ch->flags & XPC_C_DISCONNECTING)
-			return;
-	}
-
-	if (!(ch->flags & XPC_C_OPENREPLY)) {
-		ch->flags |= XPC_C_OPENREPLY;
-		xpc_arch_ops.send_chctl_openreply(ch, irq_flags);
-	}
-
-	if (!(ch->flags & XPC_C_ROPENREPLY))
-		return;
-
-	if (!(ch->flags & XPC_C_OPENCOMPLETE)) {
-		ch->flags |= (XPC_C_OPENCOMPLETE | XPC_C_CONNECTED);
-		xpc_arch_ops.send_chctl_opencomplete(ch, irq_flags);
-	}
-
-	if (!(ch->flags & XPC_C_ROPENCOMPLETE))
-		return;
-
-	dev_info(xpc_chan, "channel %d to partition %d connected\n",
-		 ch->number, ch->partid);
-
-	ch->flags = (XPC_C_CONNECTED | XPC_C_SETUP);	/* clear all else */
-}
-
-/*
- * spin_lock_irqsave() is expected to be held on entry.
- */
-static void
-xpc_process_disconnect(struct xpc_channel *ch, unsigned long *irq_flags)
-{
-	struct xpc_partition *part = &xpc_partitions[ch->partid];
-	u32 channel_was_connected = (ch->flags & XPC_C_WASCONNECTED);
-
-	DBUG_ON(!spin_is_locked(&ch->lock));
-
-	if (!(ch->flags & XPC_C_DISCONNECTING))
-		return;
-
-	DBUG_ON(!(ch->flags & XPC_C_CLOSEREQUEST));
-
-	/* make sure all activity has settled down first */
-
-	if (atomic_read(&ch->kthreads_assigned) > 0 ||
-	    atomic_read(&ch->references) > 0) {
-		return;
-	}
-	DBUG_ON((ch->flags & XPC_C_CONNECTEDCALLOUT_MADE) &&
-		!(ch->flags & XPC_C_DISCONNECTINGCALLOUT_MADE));
-
-	if (part->act_state == XPC_P_AS_DEACTIVATING) {
-		/* can't proceed until the other side disengages from us */
-		if (xpc_arch_ops.partition_engaged(ch->partid))
-			return;
-
-	} else {
-
-		/* as long as the other side is up do the full protocol */
-
-		if (!(ch->flags & XPC_C_RCLOSEREQUEST))
-			return;
-
-		if (!(ch->flags & XPC_C_CLOSEREPLY)) {
-			ch->flags |= XPC_C_CLOSEREPLY;
-			xpc_arch_ops.send_chctl_closereply(ch, irq_flags);
-		}
-
-		if (!(ch->flags & XPC_C_RCLOSEREPLY))
-			return;
-	}
-
-	/* wake those waiting for notify completion */
-	if (atomic_read(&ch->n_to_notify) > 0) {
-		/* we do callout while holding ch->lock, callout can't block */
-		xpc_arch_ops.notify_senders_of_disconnect(ch);
-	}
-
-	/* both sides are disconnected now */
-
-	if (ch->flags & XPC_C_DISCONNECTINGCALLOUT_MADE) {
-		spin_unlock_irqrestore(&ch->lock, *irq_flags);
-		xpc_disconnect_callout(ch, xpDisconnected);
-		spin_lock_irqsave(&ch->lock, *irq_flags);
-	}
-
-	DBUG_ON(atomic_read(&ch->n_to_notify) != 0);
-
-	/* it's now safe to free the channel's message queues */
-	xpc_arch_ops.teardown_msg_structures(ch);
-
-	ch->func = NULL;
-	ch->key = NULL;
-	ch->entry_size = 0;
-	ch->local_nentries = 0;
-	ch->remote_nentries = 0;
-	ch->kthreads_assigned_limit = 0;
-	ch->kthreads_idle_limit = 0;
-
-	/*
-	 * Mark the channel disconnected and clear all other flags, including
-	 * XPC_C_SETUP (because of call to
-	 * xpc_arch_ops.teardown_msg_structures()) but not including
-	 * XPC_C_WDISCONNECT (if it was set).
-	 */
-	ch->flags = (XPC_C_DISCONNECTED | (ch->flags & XPC_C_WDISCONNECT));
-
-	atomic_dec(&part->nchannels_active);
-
-	if (channel_was_connected) {
-		dev_info(xpc_chan, "channel %d to partition %d disconnected, "
-			 "reason=%d\n", ch->number, ch->partid, ch->reason);
-	}
-
-	if (ch->flags & XPC_C_WDISCONNECT) {
-		/* we won't lose the CPU since we're holding ch->lock */
-		complete(&ch->wdisconnect_wait);
-	} else if (ch->delayed_chctl_flags) {
-		if (part->act_state != XPC_P_AS_DEACTIVATING) {
-			/* time to take action on any delayed chctl flags */
-			spin_lock(&part->chctl_lock);
-			part->chctl.flags[ch->number] |=
-			    ch->delayed_chctl_flags;
-			spin_unlock(&part->chctl_lock);
-		}
-		ch->delayed_chctl_flags = 0;
-	}
-}
-
-/*
- * Process a change in the channel's remote connection state.
- */
-static void
-xpc_process_openclose_chctl_flags(struct xpc_partition *part, int ch_number,
-				  u8 chctl_flags)
-{
-	unsigned long irq_flags;
-	struct xpc_openclose_args *args =
-	    &part->remote_openclose_args[ch_number];
-	struct xpc_channel *ch = &part->channels[ch_number];
-	enum xp_retval reason;
-	enum xp_retval ret;
-	int create_kthread = 0;
-
-	spin_lock_irqsave(&ch->lock, irq_flags);
-
-again:
-
-	if ((ch->flags & XPC_C_DISCONNECTED) &&
-	    (ch->flags & XPC_C_WDISCONNECT)) {
-		/*
-		 * Delay processing chctl flags until thread waiting disconnect
-		 * has had a chance to see that the channel is disconnected.
-		 */
-		ch->delayed_chctl_flags |= chctl_flags;
-		goto out;
-	}
-
-	if (chctl_flags & XPC_CHCTL_CLOSEREQUEST) {
-
-		dev_dbg(xpc_chan, "XPC_CHCTL_CLOSEREQUEST (reason=%d) received "
-			"from partid=%d, channel=%d\n", args->reason,
-			ch->partid, ch->number);
-
-		/*
-		 * If RCLOSEREQUEST is set, we're probably waiting for
-		 * RCLOSEREPLY. We should find it and a ROPENREQUEST packed
-		 * with this RCLOSEREQUEST in the chctl_flags.
-		 */
-
-		if (ch->flags & XPC_C_RCLOSEREQUEST) {
-			DBUG_ON(!(ch->flags & XPC_C_DISCONNECTING));
-			DBUG_ON(!(ch->flags & XPC_C_CLOSEREQUEST));
-			DBUG_ON(!(ch->flags & XPC_C_CLOSEREPLY));
-			DBUG_ON(ch->flags & XPC_C_RCLOSEREPLY);
-
-			DBUG_ON(!(chctl_flags & XPC_CHCTL_CLOSEREPLY));
-			chctl_flags &= ~XPC_CHCTL_CLOSEREPLY;
-			ch->flags |= XPC_C_RCLOSEREPLY;
-
-			/* both sides have finished disconnecting */
-			xpc_process_disconnect(ch, &irq_flags);
-			DBUG_ON(!(ch->flags & XPC_C_DISCONNECTED));
-			goto again;
-		}
-
-		if (ch->flags & XPC_C_DISCONNECTED) {
-			if (!(chctl_flags & XPC_CHCTL_OPENREQUEST)) {
-				if (part->chctl.flags[ch_number] &
-				    XPC_CHCTL_OPENREQUEST) {
-
-					DBUG_ON(ch->delayed_chctl_flags != 0);
-					spin_lock(&part->chctl_lock);
-					part->chctl.flags[ch_number] |=
-					    XPC_CHCTL_CLOSEREQUEST;
-					spin_unlock(&part->chctl_lock);
-				}
-				goto out;
-			}
-
-			XPC_SET_REASON(ch, 0, 0);
-			ch->flags &= ~XPC_C_DISCONNECTED;
-
-			atomic_inc(&part->nchannels_active);
-			ch->flags |= (XPC_C_CONNECTING | XPC_C_ROPENREQUEST);
-		}
-
-		chctl_flags &= ~(XPC_CHCTL_OPENREQUEST | XPC_CHCTL_OPENREPLY |
-		    XPC_CHCTL_OPENCOMPLETE);
-
-		/*
-		 * The meaningful CLOSEREQUEST connection state fields are:
-		 *      reason = reason connection is to be closed
-		 */
-
-		ch->flags |= XPC_C_RCLOSEREQUEST;
-
-		if (!(ch->flags & XPC_C_DISCONNECTING)) {
-			reason = args->reason;
-			if (reason <= xpSuccess || reason > xpUnknownReason)
-				reason = xpUnknownReason;
-			else if (reason == xpUnregistering)
-				reason = xpOtherUnregistering;
-
-			XPC_DISCONNECT_CHANNEL(ch, reason, &irq_flags);
-
-			DBUG_ON(chctl_flags & XPC_CHCTL_CLOSEREPLY);
-			goto out;
-		}
-
-		xpc_process_disconnect(ch, &irq_flags);
-	}
-
-	if (chctl_flags & XPC_CHCTL_CLOSEREPLY) {
-
-		dev_dbg(xpc_chan, "XPC_CHCTL_CLOSEREPLY received from partid="
-			"%d, channel=%d\n", ch->partid, ch->number);
-
-		if (ch->flags & XPC_C_DISCONNECTED) {
-			DBUG_ON(part->act_state != XPC_P_AS_DEACTIVATING);
-			goto out;
-		}
-
-		DBUG_ON(!(ch->flags & XPC_C_CLOSEREQUEST));
-
-		if (!(ch->flags & XPC_C_RCLOSEREQUEST)) {
-			if (part->chctl.flags[ch_number] &
-			    XPC_CHCTL_CLOSEREQUEST) {
-
-				DBUG_ON(ch->delayed_chctl_flags != 0);
-				spin_lock(&part->chctl_lock);
-				part->chctl.flags[ch_number] |=
-				    XPC_CHCTL_CLOSEREPLY;
-				spin_unlock(&part->chctl_lock);
-			}
-			goto out;
-		}
-
-		ch->flags |= XPC_C_RCLOSEREPLY;
-
-		if (ch->flags & XPC_C_CLOSEREPLY) {
-			/* both sides have finished disconnecting */
-			xpc_process_disconnect(ch, &irq_flags);
-		}
-	}
-
-	if (chctl_flags & XPC_CHCTL_OPENREQUEST) {
-
-		dev_dbg(xpc_chan, "XPC_CHCTL_OPENREQUEST (entry_size=%d, "
-			"local_nentries=%d) received from partid=%d, "
-			"channel=%d\n", args->entry_size, args->local_nentries,
-			ch->partid, ch->number);
-
-		if (part->act_state == XPC_P_AS_DEACTIVATING ||
-		    (ch->flags & XPC_C_ROPENREQUEST)) {
-			goto out;
-		}
-
-		if (ch->flags & (XPC_C_DISCONNECTING | XPC_C_WDISCONNECT)) {
-			ch->delayed_chctl_flags |= XPC_CHCTL_OPENREQUEST;
-			goto out;
-		}
-		DBUG_ON(!(ch->flags & (XPC_C_DISCONNECTED |
-				       XPC_C_OPENREQUEST)));
-		DBUG_ON(ch->flags & (XPC_C_ROPENREQUEST | XPC_C_ROPENREPLY |
-				     XPC_C_OPENREPLY | XPC_C_CONNECTED));
-
-		/*
-		 * The meaningful OPENREQUEST connection state fields are:
-		 *      entry_size = size of channel's messages in bytes
-		 *      local_nentries = remote partition's local_nentries
-		 */
-		if (args->entry_size == 0 || args->local_nentries == 0) {
-			/* assume OPENREQUEST was delayed by mistake */
-			goto out;
-		}
-
-		ch->flags |= (XPC_C_ROPENREQUEST | XPC_C_CONNECTING);
-		ch->remote_nentries = args->local_nentries;
-
-		if (ch->flags & XPC_C_OPENREQUEST) {
-			if (args->entry_size != ch->entry_size) {
-				XPC_DISCONNECT_CHANNEL(ch, xpUnequalMsgSizes,
-						       &irq_flags);
-				goto out;
-			}
-		} else {
-			ch->entry_size = args->entry_size;
-
-			XPC_SET_REASON(ch, 0, 0);
-			ch->flags &= ~XPC_C_DISCONNECTED;
-
-			atomic_inc(&part->nchannels_active);
-		}
-
-		xpc_process_connect(ch, &irq_flags);
-	}
-
-	if (chctl_flags & XPC_CHCTL_OPENREPLY) {
-
-		dev_dbg(xpc_chan, "XPC_CHCTL_OPENREPLY (local_msgqueue_pa="
-			"0x%lx, local_nentries=%d, remote_nentries=%d) "
-			"received from partid=%d, channel=%d\n",
-			args->local_msgqueue_pa, args->local_nentries,
-			args->remote_nentries, ch->partid, ch->number);
-
-		if (ch->flags & (XPC_C_DISCONNECTING | XPC_C_DISCONNECTED))
-			goto out;
-
-		if (!(ch->flags & XPC_C_OPENREQUEST)) {
-			XPC_DISCONNECT_CHANNEL(ch, xpOpenCloseError,
-					       &irq_flags);
-			goto out;
-		}
-
-		DBUG_ON(!(ch->flags & XPC_C_ROPENREQUEST));
-		DBUG_ON(ch->flags & XPC_C_CONNECTED);
-
-		/*
-		 * The meaningful OPENREPLY connection state fields are:
-		 *      local_msgqueue_pa = physical address of remote
-		 *                          partition's local_msgqueue
-		 *      local_nentries = remote partition's local_nentries
-		 *      remote_nentries = remote partition's remote_nentries
-		 */
-		DBUG_ON(args->local_msgqueue_pa == 0);
-		DBUG_ON(args->local_nentries == 0);
-		DBUG_ON(args->remote_nentries == 0);
-
-		ret = xpc_arch_ops.save_remote_msgqueue_pa(ch,
-						      args->local_msgqueue_pa);
-		if (ret != xpSuccess) {
-			XPC_DISCONNECT_CHANNEL(ch, ret, &irq_flags);
-			goto out;
-		}
-		ch->flags |= XPC_C_ROPENREPLY;
-
-		if (args->local_nentries < ch->remote_nentries) {
-			dev_dbg(xpc_chan, "XPC_CHCTL_OPENREPLY: new "
-				"remote_nentries=%d, old remote_nentries=%d, "
-				"partid=%d, channel=%d\n",
-				args->local_nentries, ch->remote_nentries,
-				ch->partid, ch->number);
-
-			ch->remote_nentries = args->local_nentries;
-		}
-		if (args->remote_nentries < ch->local_nentries) {
-			dev_dbg(xpc_chan, "XPC_CHCTL_OPENREPLY: new "
-				"local_nentries=%d, old local_nentries=%d, "
-				"partid=%d, channel=%d\n",
-				args->remote_nentries, ch->local_nentries,
-				ch->partid, ch->number);
-
-			ch->local_nentries = args->remote_nentries;
-		}
-
-		xpc_process_connect(ch, &irq_flags);
-	}
-
-	if (chctl_flags & XPC_CHCTL_OPENCOMPLETE) {
-
-		dev_dbg(xpc_chan, "XPC_CHCTL_OPENCOMPLETE received from "
-			"partid=%d, channel=%d\n", ch->partid, ch->number);
-
-		if (ch->flags & (XPC_C_DISCONNECTING | XPC_C_DISCONNECTED))
-			goto out;
-
-		if (!(ch->flags & XPC_C_OPENREQUEST) ||
-		    !(ch->flags & XPC_C_OPENREPLY)) {
-			XPC_DISCONNECT_CHANNEL(ch, xpOpenCloseError,
-					       &irq_flags);
-			goto out;
-		}
-
-		DBUG_ON(!(ch->flags & XPC_C_ROPENREQUEST));
-		DBUG_ON(!(ch->flags & XPC_C_ROPENREPLY));
-		DBUG_ON(!(ch->flags & XPC_C_CONNECTED));
-
-		ch->flags |= XPC_C_ROPENCOMPLETE;
-
-		xpc_process_connect(ch, &irq_flags);
-		create_kthread = 1;
-	}
-
-out:
-	spin_unlock_irqrestore(&ch->lock, irq_flags);
-
-	if (create_kthread)
-		xpc_create_kthreads(ch, 1, 0);
-}
-
-/*
- * Attempt to establish a channel connection to a remote partition.
- */
-static enum xp_retval
-xpc_connect_channel(struct xpc_channel *ch)
-{
-	unsigned long irq_flags;
-	struct xpc_registration *registration = &xpc_registrations[ch->number];
-
-	if (mutex_trylock(&registration->mutex) == 0)
-		return xpRetry;
-
-	if (!XPC_CHANNEL_REGISTERED(ch->number)) {
-		mutex_unlock(&registration->mutex);
-		return xpUnregistered;
-	}
-
-	spin_lock_irqsave(&ch->lock, irq_flags);
-
-	DBUG_ON(ch->flags & XPC_C_CONNECTED);
-	DBUG_ON(ch->flags & XPC_C_OPENREQUEST);
-
-	if (ch->flags & XPC_C_DISCONNECTING) {
-		spin_unlock_irqrestore(&ch->lock, irq_flags);
-		mutex_unlock(&registration->mutex);
-		return ch->reason;
-	}
-
-	/* add info from the channel connect registration to the channel */
-
-	ch->kthreads_assigned_limit = registration->assigned_limit;
-	ch->kthreads_idle_limit = registration->idle_limit;
-	DBUG_ON(atomic_read(&ch->kthreads_assigned) != 0);
-	DBUG_ON(atomic_read(&ch->kthreads_idle) != 0);
-	DBUG_ON(atomic_read(&ch->kthreads_active) != 0);
-
-	ch->func = registration->func;
-	DBUG_ON(registration->func == NULL);
-	ch->key = registration->key;
-
-	ch->local_nentries = registration->nentries;
-
-	if (ch->flags & XPC_C_ROPENREQUEST) {
-		if (registration->entry_size != ch->entry_size) {
-			/* the local and remote sides aren't the same */
-
-			/*
-			 * Because XPC_DISCONNECT_CHANNEL() can block we're
-			 * forced to up the registration sema before we unlock
-			 * the channel lock. But that's okay here because we're
-			 * done with the part that required the registration
-			 * sema. XPC_DISCONNECT_CHANNEL() requires that the
-			 * channel lock be locked and will unlock and relock
-			 * the channel lock as needed.
-			 */
-			mutex_unlock(&registration->mutex);
-			XPC_DISCONNECT_CHANNEL(ch, xpUnequalMsgSizes,
-					       &irq_flags);
-			spin_unlock_irqrestore(&ch->lock, irq_flags);
-			return xpUnequalMsgSizes;
-		}
-	} else {
-		ch->entry_size = registration->entry_size;
-
-		XPC_SET_REASON(ch, 0, 0);
-		ch->flags &= ~XPC_C_DISCONNECTED;
-
-		atomic_inc(&xpc_partitions[ch->partid].nchannels_active);
-	}
-
-	mutex_unlock(&registration->mutex);
-
-	/* initiate the connection */
-
-	ch->flags |= (XPC_C_OPENREQUEST | XPC_C_CONNECTING);
-	xpc_arch_ops.send_chctl_openrequest(ch, &irq_flags);
-
-	xpc_process_connect(ch, &irq_flags);
-
-	spin_unlock_irqrestore(&ch->lock, irq_flags);
-
-	return xpSuccess;
-}
-
-void
-xpc_process_sent_chctl_flags(struct xpc_partition *part)
-{
-	unsigned long irq_flags;
-	union xpc_channel_ctl_flags chctl;
-	struct xpc_channel *ch;
-	int ch_number;
-	u32 ch_flags;
-
-	chctl.all_flags = xpc_arch_ops.get_chctl_all_flags(part);
-
-	/*
-	 * Initiate channel connections for registered channels.
-	 *
-	 * For each connected channel that has pending messages activate idle
-	 * kthreads and/or create new kthreads as needed.
-	 */
-
-	for (ch_number = 0; ch_number < part->nchannels; ch_number++) {
-		ch = &part->channels[ch_number];
-
-		/*
-		 * Process any open or close related chctl flags, and then deal
-		 * with connecting or disconnecting the channel as required.
-		 */
-
-		if (chctl.flags[ch_number] & XPC_OPENCLOSE_CHCTL_FLAGS) {
-			xpc_process_openclose_chctl_flags(part, ch_number,
-							chctl.flags[ch_number]);
-		}
-
-		ch_flags = ch->flags;	/* need an atomic snapshot of flags */
-
-		if (ch_flags & XPC_C_DISCONNECTING) {
-			spin_lock_irqsave(&ch->lock, irq_flags);
-			xpc_process_disconnect(ch, &irq_flags);
-			spin_unlock_irqrestore(&ch->lock, irq_flags);
-			continue;
-		}
-
-		if (part->act_state == XPC_P_AS_DEACTIVATING)
-			continue;
-
-		if (!(ch_flags & XPC_C_CONNECTED)) {
-			if (!(ch_flags & XPC_C_OPENREQUEST)) {
-				DBUG_ON(ch_flags & XPC_C_SETUP);
-				(void)xpc_connect_channel(ch);
-			}
-			continue;
-		}
-
-		/*
-		 * Process any message related chctl flags, this may involve
-		 * the activation of kthreads to deliver any pending messages
-		 * sent from the other partition.
-		 */
-
-		if (chctl.flags[ch_number] & XPC_MSG_CHCTL_FLAGS)
-			xpc_arch_ops.process_msg_chctl_flags(part, ch_number);
-	}
-}
-
-/*
- * XPC's heartbeat code calls this function to inform XPC that a partition is
- * going down.  XPC responds by tearing down the XPartition Communication
- * infrastructure used for the just downed partition.
- *
- * XPC's heartbeat code will never call this function and xpc_partition_up()
- * at the same time. Nor will it ever make multiple calls to either function
- * at the same time.
- */
-void
-xpc_partition_going_down(struct xpc_partition *part, enum xp_retval reason)
-{
-	unsigned long irq_flags;
-	int ch_number;
-	struct xpc_channel *ch;
-
-	dev_dbg(xpc_chan, "deactivating partition %d, reason=%d\n",
-		XPC_PARTID(part), reason);
-
-	if (!xpc_part_ref(part)) {
-		/* infrastructure for this partition isn't currently set up */
-		return;
-	}
-
-	/* disconnect channels associated with the partition going down */
-
-	for (ch_number = 0; ch_number < part->nchannels; ch_number++) {
-		ch = &part->channels[ch_number];
-
-		xpc_msgqueue_ref(ch);
-		spin_lock_irqsave(&ch->lock, irq_flags);
-
-		XPC_DISCONNECT_CHANNEL(ch, reason, &irq_flags);
-
-		spin_unlock_irqrestore(&ch->lock, irq_flags);
-		xpc_msgqueue_deref(ch);
-	}
-
-	xpc_wakeup_channel_mgr(part);
-
-	xpc_part_deref(part);
-}
-
-/*
- * Called by XP at the time of channel connection registration to cause
- * XPC to establish connections to all currently active partitions.
- */
-void
-xpc_initiate_connect(int ch_number)
-{
-	short partid;
-	struct xpc_partition *part;
-	struct xpc_channel *ch;
-
-	DBUG_ON(ch_number < 0 || ch_number >= XPC_MAX_NCHANNELS);
-
-	for (partid = 0; partid < xp_max_npartitions; partid++) {
-		part = &xpc_partitions[partid];
-
-		if (xpc_part_ref(part)) {
-			ch = &part->channels[ch_number];
-
-			/*
-			 * Initiate the establishment of a connection on the
-			 * newly registered channel to the remote partition.
-			 */
-			xpc_wakeup_channel_mgr(part);
-			xpc_part_deref(part);
-		}
-	}
-}
-
-void
-xpc_connected_callout(struct xpc_channel *ch)
-{
-	/* let the registerer know that a connection has been established */
-
-	if (ch->func != NULL) {
-		dev_dbg(xpc_chan, "ch->func() called, reason=xpConnected, "
-			"partid=%d, channel=%d\n", ch->partid, ch->number);
-
-		ch->func(xpConnected, ch->partid, ch->number,
-			 (void *)(u64)ch->local_nentries, ch->key);
-
-		dev_dbg(xpc_chan, "ch->func() returned, reason=xpConnected, "
-			"partid=%d, channel=%d\n", ch->partid, ch->number);
-	}
-}
-
-/*
- * Called by XP at the time of channel connection unregistration to cause
- * XPC to teardown all current connections for the specified channel.
- *
- * Before returning xpc_initiate_disconnect() will wait until all connections
- * on the specified channel have been closed/torndown. So the caller can be
- * assured that they will not be receiving any more callouts from XPC to the
- * function they registered via xpc_connect().
- *
- * Arguments:
- *
- *	ch_number - channel # to unregister.
- */
-void
-xpc_initiate_disconnect(int ch_number)
-{
-	unsigned long irq_flags;
-	short partid;
-	struct xpc_partition *part;
-	struct xpc_channel *ch;
-
-	DBUG_ON(ch_number < 0 || ch_number >= XPC_MAX_NCHANNELS);
-
-	/* initiate the channel disconnect for every active partition */
-	for (partid = 0; partid < xp_max_npartitions; partid++) {
-		part = &xpc_partitions[partid];
-
-		if (xpc_part_ref(part)) {
-			ch = &part->channels[ch_number];
-			xpc_msgqueue_ref(ch);
-
-			spin_lock_irqsave(&ch->lock, irq_flags);
-
-			if (!(ch->flags & XPC_C_DISCONNECTED)) {
-				ch->flags |= XPC_C_WDISCONNECT;
-
-				XPC_DISCONNECT_CHANNEL(ch, xpUnregistering,
-						       &irq_flags);
-			}
-
-			spin_unlock_irqrestore(&ch->lock, irq_flags);
-
-			xpc_msgqueue_deref(ch);
-			xpc_part_deref(part);
-		}
-	}
-
-	xpc_disconnect_wait(ch_number);
-}
-
-/*
- * To disconnect a channel, and reflect it back to all who may be waiting.
- *
- * An OPEN is not allowed until XPC_C_DISCONNECTING is cleared by
- * xpc_process_disconnect(), and if set, XPC_C_WDISCONNECT is cleared by
- * xpc_disconnect_wait().
- *
- * THE CHANNEL IS TO BE LOCKED BY THE CALLER AND WILL REMAIN LOCKED UPON RETURN.
- */
-void
-xpc_disconnect_channel(const int line, struct xpc_channel *ch,
-		       enum xp_retval reason, unsigned long *irq_flags)
-{
-	u32 channel_was_connected = (ch->flags & XPC_C_CONNECTED);
-
-	DBUG_ON(!spin_is_locked(&ch->lock));
-
-	if (ch->flags & (XPC_C_DISCONNECTING | XPC_C_DISCONNECTED))
-		return;
-
-	DBUG_ON(!(ch->flags & (XPC_C_CONNECTING | XPC_C_CONNECTED)));
-
-	dev_dbg(xpc_chan, "reason=%d, line=%d, partid=%d, channel=%d\n",
-		reason, line, ch->partid, ch->number);
-
-	XPC_SET_REASON(ch, reason, line);
-
-	ch->flags |= (XPC_C_CLOSEREQUEST | XPC_C_DISCONNECTING);
-	/* some of these may not have been set */
-	ch->flags &= ~(XPC_C_OPENREQUEST | XPC_C_OPENREPLY |
-		       XPC_C_ROPENREQUEST | XPC_C_ROPENREPLY |
-		       XPC_C_CONNECTING | XPC_C_CONNECTED);
-
-	xpc_arch_ops.send_chctl_closerequest(ch, irq_flags);
-
-	if (channel_was_connected)
-		ch->flags |= XPC_C_WASCONNECTED;
-
-	spin_unlock_irqrestore(&ch->lock, *irq_flags);
-
-	/* wake all idle kthreads so they can exit */
-	if (atomic_read(&ch->kthreads_idle) > 0) {
-		wake_up_all(&ch->idle_wq);
-
-	} else if ((ch->flags & XPC_C_CONNECTEDCALLOUT_MADE) &&
-		   !(ch->flags & XPC_C_DISCONNECTINGCALLOUT)) {
-		/* start a kthread that will do the xpDisconnecting callout */
-		xpc_create_kthreads(ch, 1, 1);
-	}
-
-	/* wake those waiting to allocate an entry from the local msg queue */
-	if (atomic_read(&ch->n_on_msg_allocate_wq) > 0)
-		wake_up(&ch->msg_allocate_wq);
-
-	spin_lock_irqsave(&ch->lock, *irq_flags);
-}
-
-void
-xpc_disconnect_callout(struct xpc_channel *ch, enum xp_retval reason)
-{
-	/*
-	 * Let the channel's registerer know that the channel is being
-	 * disconnected. We don't want to do this if the registerer was never
-	 * informed of a connection being made.
-	 */
-
-	if (ch->func != NULL) {
-		dev_dbg(xpc_chan, "ch->func() called, reason=%d, partid=%d, "
-			"channel=%d\n", reason, ch->partid, ch->number);
-
-		ch->func(reason, ch->partid, ch->number, NULL, ch->key);
-
-		dev_dbg(xpc_chan, "ch->func() returned, reason=%d, partid=%d, "
-			"channel=%d\n", reason, ch->partid, ch->number);
-	}
-}
-
-/*
- * Wait for a message entry to become available for the specified channel,
- * but don't wait any longer than 1 jiffy.
- */
-enum xp_retval
-xpc_allocate_msg_wait(struct xpc_channel *ch)
-{
-	enum xp_retval ret;
-
-	if (ch->flags & XPC_C_DISCONNECTING) {
-		DBUG_ON(ch->reason == xpInterrupted);
-		return ch->reason;
-	}
-
-	atomic_inc(&ch->n_on_msg_allocate_wq);
-	ret = interruptible_sleep_on_timeout(&ch->msg_allocate_wq, 1);
-	atomic_dec(&ch->n_on_msg_allocate_wq);
-
-	if (ch->flags & XPC_C_DISCONNECTING) {
-		ret = ch->reason;
-		DBUG_ON(ch->reason == xpInterrupted);
-	} else if (ret == 0) {
-		ret = xpTimeout;
-	} else {
-		ret = xpInterrupted;
-	}
-
-	return ret;
-}
-
-/*
- * Send a message that contains the user's payload on the specified channel
- * connected to the specified partition.
- *
- * NOTE that this routine can sleep waiting for a message entry to become
- * available. To not sleep, pass in the XPC_NOWAIT flag.
- *
- * Once sent, this routine will not wait for the message to be received, nor
- * will notification be given when it does happen.
- *
- * Arguments:
- *
- *	partid - ID of partition to which the channel is connected.
- *	ch_number - channel # to send message on.
- *	flags - see xp.h for valid flags.
- *	payload - pointer to the payload which is to be sent.
- *	payload_size - size of the payload in bytes.
- */
-enum xp_retval
-xpc_initiate_send(short partid, int ch_number, u32 flags, void *payload,
-		  u16 payload_size)
-{
-	struct xpc_partition *part = &xpc_partitions[partid];
-	enum xp_retval ret = xpUnknownReason;
-
-	dev_dbg(xpc_chan, "payload=0x%p, partid=%d, channel=%d\n", payload,
-		partid, ch_number);
-
-	DBUG_ON(partid < 0 || partid >= xp_max_npartitions);
-	DBUG_ON(ch_number < 0 || ch_number >= part->nchannels);
-	DBUG_ON(payload == NULL);
-
-	if (xpc_part_ref(part)) {
-		ret = xpc_arch_ops.send_payload(&part->channels[ch_number],
-				  flags, payload, payload_size, 0, NULL, NULL);
-		xpc_part_deref(part);
-	}
-
-	return ret;
-}
-
-/*
- * Send a message that contains the user's payload on the specified channel
- * connected to the specified partition.
- *
- * NOTE that this routine can sleep waiting for a message entry to become
- * available. To not sleep, pass in the XPC_NOWAIT flag.
- *
- * This routine will not wait for the message to be sent or received.
- *
- * Once the remote end of the channel has received the message, the function
- * passed as an argument to xpc_initiate_send_notify() will be called. This
- * allows the sender to free up or re-use any buffers referenced by the
- * message, but does NOT mean the message has been processed at the remote
- * end by a receiver.
- *
- * If this routine returns an error, the caller's function will NOT be called.
- *
- * Arguments:
- *
- *	partid - ID of partition to which the channel is connected.
- *	ch_number - channel # to send message on.
- *	flags - see xp.h for valid flags.
- *	payload - pointer to the payload which is to be sent.
- *	payload_size - size of the payload in bytes.
- *	func - function to call with asynchronous notification of message
- *		  receipt. THIS FUNCTION MUST BE NON-BLOCKING.
- *	key - user-defined key to be passed to the function when it's called.
- */
-enum xp_retval
-xpc_initiate_send_notify(short partid, int ch_number, u32 flags, void *payload,
-			 u16 payload_size, xpc_notify_func func, void *key)
-{
-	struct xpc_partition *part = &xpc_partitions[partid];
-	enum xp_retval ret = xpUnknownReason;
-
-	dev_dbg(xpc_chan, "payload=0x%p, partid=%d, channel=%d\n", payload,
-		partid, ch_number);
-
-	DBUG_ON(partid < 0 || partid >= xp_max_npartitions);
-	DBUG_ON(ch_number < 0 || ch_number >= part->nchannels);
-	DBUG_ON(payload == NULL);
-	DBUG_ON(func == NULL);
-
-	if (xpc_part_ref(part)) {
-		ret = xpc_arch_ops.send_payload(&part->channels[ch_number],
-			  flags, payload, payload_size, XPC_N_CALL, func, key);
-		xpc_part_deref(part);
-	}
-	return ret;
-}
-
-/*
- * Deliver a message's payload to its intended recipient.
- */
-void
-xpc_deliver_payload(struct xpc_channel *ch)
-{
-	void *payload;
-
-	payload = xpc_arch_ops.get_deliverable_payload(ch);
-	if (payload != NULL) {
-
-		/*
-		 * This ref is taken to protect the payload itself from being
-		 * freed before the user is finished with it, which the user
-		 * indicates by calling xpc_initiate_received().
-		 */
-		xpc_msgqueue_ref(ch);
-
-		atomic_inc(&ch->kthreads_active);
-
-		if (ch->func != NULL) {
-			dev_dbg(xpc_chan, "ch->func() called, payload=0x%p "
-				"partid=%d channel=%d\n", payload, ch->partid,
-				ch->number);
-
-			/* deliver the message to its intended recipient */
-			ch->func(xpMsgReceived, ch->partid, ch->number, payload,
-				 ch->key);
-
-			dev_dbg(xpc_chan, "ch->func() returned, payload=0x%p "
-				"partid=%d channel=%d\n", payload, ch->partid,
-				ch->number);
-		}
-
-		atomic_dec(&ch->kthreads_active);
-	}
-}
-
-/*
- * Acknowledge receipt of a delivered message's payload.
- *
- * This function, although called by users, does not call xpc_part_ref() to
- * ensure that the partition infrastructure is in place. It relies on the
- * fact that we called xpc_msgqueue_ref() in xpc_deliver_payload().
- *
- * Arguments:
- *
- *	partid - ID of partition to which the channel is connected.
- *	ch_number - channel # message received on.
- *	payload - pointer to the payload area allocated via
- *			xpc_initiate_send() or xpc_initiate_send_notify().
- */
-void
-xpc_initiate_received(short partid, int ch_number, void *payload)
-{
-	struct xpc_partition *part = &xpc_partitions[partid];
-	struct xpc_channel *ch;
-
-	DBUG_ON(partid < 0 || partid >= xp_max_npartitions);
-	DBUG_ON(ch_number < 0 || ch_number >= part->nchannels);
-
-	ch = &part->channels[ch_number];
-	xpc_arch_ops.received_payload(ch, payload);
-
-	/* the call to xpc_msgqueue_ref() was done by xpc_deliver_payload()  */
-	xpc_msgqueue_deref(ch);
-}