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, 1344 deletions

diff --git a/ANDROID_3.4.5/drivers/misc/sgi-xp/xpc_main.c b/ANDROID_3.4.5/drivers/misc/sgi-xp/xpc_main.c
deleted file mode 100644
index 8d082b46..00000000
--- a/ANDROID_3.4.5/drivers/misc/sgi-xp/xpc_main.c
+++ /dev/null
@@ -1,1344 +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) support - standard version.
- *
- *	XPC provides a message passing capability that crosses partition
- *	boundaries. This module is made up of two parts:
- *
- *	    partition	This part detects the presence/absence of other
- *			partitions. It provides a heartbeat and monitors
- *			the heartbeats of other partitions.
- *
- *	    channel	This part manages the channels and sends/receives
- *			messages across them to/from other partitions.
- *
- *	There are a couple of additional functions residing in XP, which
- *	provide an interface to XPC for its users.
- *
- *
- *	Caveats:
- *
- *	  . Currently on sn2, we have no way to determine which nasid an IRQ
- *	    came from. Thus, xpc_send_IRQ_sn2() does a remote amo write
- *	    followed by an IPI. The amo indicates where data is to be pulled
- *	    from, so after the IPI arrives, the remote partition checks the amo
- *	    word. The IPI can actually arrive before the amo however, so other
- *	    code must periodically check for this case. Also, remote amo
- *	    operations do not reliably time out. Thus we do a remote PIO read
- *	    solely to know whether the remote partition is down and whether we
- *	    should stop sending IPIs to it. This remote PIO read operation is
- *	    set up in a special nofault region so SAL knows to ignore (and
- *	    cleanup) any errors due to the remote amo write, PIO read, and/or
- *	    PIO write operations.
- *
- *	    If/when new hardware solves this IPI problem, we should abandon
- *	    the current approach.
- *
- */
-
-#include <linux/module.h>
-#include <linux/slab.h>
-#include <linux/sysctl.h>
-#include <linux/device.h>
-#include <linux/delay.h>
-#include <linux/reboot.h>
-#include <linux/kdebug.h>
-#include <linux/kthread.h>
-#include "xpc.h"
-
-/* define two XPC debug device structures to be used with dev_dbg() et al */
-
-struct device_driver xpc_dbg_name = {
-	.name = "xpc"
-};
-
-struct device xpc_part_dbg_subname = {
-	.init_name = "",	/* set to "part" at xpc_init() time */
-	.driver = &xpc_dbg_name
-};
-
-struct device xpc_chan_dbg_subname = {
-	.init_name = "",	/* set to "chan" at xpc_init() time */
-	.driver = &xpc_dbg_name
-};
-
-struct device *xpc_part = &xpc_part_dbg_subname;
-struct device *xpc_chan = &xpc_chan_dbg_subname;
-
-static int xpc_kdebug_ignore;
-
-/* systune related variables for /proc/sys directories */
-
-static int xpc_hb_interval = XPC_HB_DEFAULT_INTERVAL;
-static int xpc_hb_min_interval = 1;
-static int xpc_hb_max_interval = 10;
-
-static int xpc_hb_check_interval = XPC_HB_CHECK_DEFAULT_INTERVAL;
-static int xpc_hb_check_min_interval = 10;
-static int xpc_hb_check_max_interval = 120;
-
-int xpc_disengage_timelimit = XPC_DISENGAGE_DEFAULT_TIMELIMIT;
-static int xpc_disengage_min_timelimit;	/* = 0 */
-static int xpc_disengage_max_timelimit = 120;
-
-static ctl_table xpc_sys_xpc_hb_dir[] = {
-	{
-	 .procname = "hb_interval",
-	 .data = &xpc_hb_interval,
-	 .maxlen = sizeof(int),
-	 .mode = 0644,
-	 .proc_handler = proc_dointvec_minmax,
-	 .extra1 = &xpc_hb_min_interval,
-	 .extra2 = &xpc_hb_max_interval},
-	{
-	 .procname = "hb_check_interval",
-	 .data = &xpc_hb_check_interval,
-	 .maxlen = sizeof(int),
-	 .mode = 0644,
-	 .proc_handler = proc_dointvec_minmax,
-	 .extra1 = &xpc_hb_check_min_interval,
-	 .extra2 = &xpc_hb_check_max_interval},
-	{}
-};
-static ctl_table xpc_sys_xpc_dir[] = {
-	{
-	 .procname = "hb",
-	 .mode = 0555,
-	 .child = xpc_sys_xpc_hb_dir},
-	{
-	 .procname = "disengage_timelimit",
-	 .data = &xpc_disengage_timelimit,
-	 .maxlen = sizeof(int),
-	 .mode = 0644,
-	 .proc_handler = proc_dointvec_minmax,
-	 .extra1 = &xpc_disengage_min_timelimit,
-	 .extra2 = &xpc_disengage_max_timelimit},
-	{}
-};
-static ctl_table xpc_sys_dir[] = {
-	{
-	 .procname = "xpc",
-	 .mode = 0555,
-	 .child = xpc_sys_xpc_dir},
-	{}
-};
-static struct ctl_table_header *xpc_sysctl;
-
-/* non-zero if any remote partition disengage was timed out */
-int xpc_disengage_timedout;
-
-/* #of activate IRQs received and not yet processed */
-int xpc_activate_IRQ_rcvd;
-DEFINE_SPINLOCK(xpc_activate_IRQ_rcvd_lock);
-
-/* IRQ handler notifies this wait queue on receipt of an IRQ */
-DECLARE_WAIT_QUEUE_HEAD(xpc_activate_IRQ_wq);
-
-static unsigned long xpc_hb_check_timeout;
-static struct timer_list xpc_hb_timer;
-
-/* notification that the xpc_hb_checker thread has exited */
-static DECLARE_COMPLETION(xpc_hb_checker_exited);
-
-/* notification that the xpc_discovery thread has exited */
-static DECLARE_COMPLETION(xpc_discovery_exited);
-
-static void xpc_kthread_waitmsgs(struct xpc_partition *, struct xpc_channel *);
-
-static int xpc_system_reboot(struct notifier_block *, unsigned long, void *);
-static struct notifier_block xpc_reboot_notifier = {
-	.notifier_call = xpc_system_reboot,
-};
-
-static int xpc_system_die(struct notifier_block *, unsigned long, void *);
-static struct notifier_block xpc_die_notifier = {
-	.notifier_call = xpc_system_die,
-};
-
-struct xpc_arch_operations xpc_arch_ops;
-
-/*
- * Timer function to enforce the timelimit on the partition disengage.
- */
-static void
-xpc_timeout_partition_disengage(unsigned long data)
-{
-	struct xpc_partition *part = (struct xpc_partition *)data;
-
-	DBUG_ON(time_is_after_jiffies(part->disengage_timeout));
-
-	(void)xpc_partition_disengaged(part);
-
-	DBUG_ON(part->disengage_timeout != 0);
-	DBUG_ON(xpc_arch_ops.partition_engaged(XPC_PARTID(part)));
-}
-
-/*
- * Timer to produce the heartbeat.  The timer structures function is
- * already set when this is initially called.  A tunable is used to
- * specify when the next timeout should occur.
- */
-static void
-xpc_hb_beater(unsigned long dummy)
-{
-	xpc_arch_ops.increment_heartbeat();
-
-	if (time_is_before_eq_jiffies(xpc_hb_check_timeout))
-		wake_up_interruptible(&xpc_activate_IRQ_wq);
-
-	xpc_hb_timer.expires = jiffies + (xpc_hb_interval * HZ);
-	add_timer(&xpc_hb_timer);
-}
-
-static void
-xpc_start_hb_beater(void)
-{
-	xpc_arch_ops.heartbeat_init();
-	init_timer(&xpc_hb_timer);
-	xpc_hb_timer.function = xpc_hb_beater;
-	xpc_hb_beater(0);
-}
-
-static void
-xpc_stop_hb_beater(void)
-{
-	del_timer_sync(&xpc_hb_timer);
-	xpc_arch_ops.heartbeat_exit();
-}
-
-/*
- * At periodic intervals, scan through all active partitions and ensure
- * their heartbeat is still active.  If not, the partition is deactivated.
- */
-static void
-xpc_check_remote_hb(void)
-{
-	struct xpc_partition *part;
-	short partid;
-	enum xp_retval ret;
-
-	for (partid = 0; partid < xp_max_npartitions; partid++) {
-
-		if (xpc_exiting)
-			break;
-
-		if (partid == xp_partition_id)
-			continue;
-
-		part = &xpc_partitions[partid];
-
-		if (part->act_state == XPC_P_AS_INACTIVE ||
-		    part->act_state == XPC_P_AS_DEACTIVATING) {
-			continue;
-		}
-
-		ret = xpc_arch_ops.get_remote_heartbeat(part);
-		if (ret != xpSuccess)
-			XPC_DEACTIVATE_PARTITION(part, ret);
-	}
-}
-
-/*
- * This thread is responsible for nearly all of the partition
- * activation/deactivation.
- */
-static int
-xpc_hb_checker(void *ignore)
-{
-	int force_IRQ = 0;
-
-	/* this thread was marked active by xpc_hb_init() */
-
-	set_cpus_allowed_ptr(current, cpumask_of(XPC_HB_CHECK_CPU));
-
-	/* set our heartbeating to other partitions into motion */
-	xpc_hb_check_timeout = jiffies + (xpc_hb_check_interval * HZ);
-	xpc_start_hb_beater();
-
-	while (!xpc_exiting) {
-
-		dev_dbg(xpc_part, "woke up with %d ticks rem; %d IRQs have "
-			"been received\n",
-			(int)(xpc_hb_check_timeout - jiffies),
-			xpc_activate_IRQ_rcvd);
-
-		/* checking of remote heartbeats is skewed by IRQ handling */
-		if (time_is_before_eq_jiffies(xpc_hb_check_timeout)) {
-			xpc_hb_check_timeout = jiffies +
-			    (xpc_hb_check_interval * HZ);
-
-			dev_dbg(xpc_part, "checking remote heartbeats\n");
-			xpc_check_remote_hb();
-
-			/*
-			 * On sn2 we need to periodically recheck to ensure no
-			 * IRQ/amo pairs have been missed.
-			 */
-			if (is_shub())
-				force_IRQ = 1;
-		}
-
-		/* check for outstanding IRQs */
-		if (xpc_activate_IRQ_rcvd > 0 || force_IRQ != 0) {
-			force_IRQ = 0;
-			dev_dbg(xpc_part, "processing activate IRQs "
-				"received\n");
-			xpc_arch_ops.process_activate_IRQ_rcvd();
-		}
-
-		/* wait for IRQ or timeout */
-		(void)wait_event_interruptible(xpc_activate_IRQ_wq,
-					       (time_is_before_eq_jiffies(
-						xpc_hb_check_timeout) ||
-						xpc_activate_IRQ_rcvd > 0 ||
-						xpc_exiting));
-	}
-
-	xpc_stop_hb_beater();
-
-	dev_dbg(xpc_part, "heartbeat checker is exiting\n");
-
-	/* mark this thread as having exited */
-	complete(&xpc_hb_checker_exited);
-	return 0;
-}
-
-/*
- * This thread will attempt to discover other partitions to activate
- * based on info provided by SAL. This new thread is short lived and
- * will exit once discovery is complete.
- */
-static int
-xpc_initiate_discovery(void *ignore)
-{
-	xpc_discovery();
-
-	dev_dbg(xpc_part, "discovery thread is exiting\n");
-
-	/* mark this thread as having exited */
-	complete(&xpc_discovery_exited);
-	return 0;
-}
-
-/*
- * The first kthread assigned to a newly activated partition is the one
- * created by XPC HB with which it calls xpc_activating(). XPC hangs on to
- * that kthread until the partition is brought down, at which time that kthread
- * returns back to XPC HB. (The return of that kthread will signify to XPC HB
- * that XPC has dismantled all communication infrastructure for the associated
- * partition.) This kthread becomes the channel manager for that partition.
- *
- * Each active partition has a channel manager, who, besides connecting and
- * disconnecting channels, will ensure that each of the partition's connected
- * channels has the required number of assigned kthreads to get the work done.
- */
-static void
-xpc_channel_mgr(struct xpc_partition *part)
-{
-	while (part->act_state != XPC_P_AS_DEACTIVATING ||
-	       atomic_read(&part->nchannels_active) > 0 ||
-	       !xpc_partition_disengaged(part)) {
-
-		xpc_process_sent_chctl_flags(part);
-
-		/*
-		 * Wait until we've been requested to activate kthreads or
-		 * all of the channel's message queues have been torn down or
-		 * a signal is pending.
-		 *
-		 * The channel_mgr_requests is set to 1 after being awakened,
-		 * This is done to prevent the channel mgr from making one pass
-		 * through the loop for each request, since he will
-		 * be servicing all the requests in one pass. The reason it's
-		 * set to 1 instead of 0 is so that other kthreads will know
-		 * that the channel mgr is running and won't bother trying to
-		 * wake him up.
-		 */
-		atomic_dec(&part->channel_mgr_requests);
-		(void)wait_event_interruptible(part->channel_mgr_wq,
-				(atomic_read(&part->channel_mgr_requests) > 0 ||
-				 part->chctl.all_flags != 0 ||
-				 (part->act_state == XPC_P_AS_DEACTIVATING &&
-				 atomic_read(&part->nchannels_active) == 0 &&
-				 xpc_partition_disengaged(part))));
-		atomic_set(&part->channel_mgr_requests, 1);
-	}
-}
-
-/*
- * Guarantee that the kzalloc'd memory is cacheline aligned.
- */
-void *
-xpc_kzalloc_cacheline_aligned(size_t size, gfp_t flags, void **base)
-{
-	/* see if kzalloc will give us cachline aligned memory by default */
-	*base = kzalloc(size, flags);
-	if (*base == NULL)
-		return NULL;
-
-	if ((u64)*base == L1_CACHE_ALIGN((u64)*base))
-		return *base;
-
-	kfree(*base);
-
-	/* nope, we'll have to do it ourselves */
-	*base = kzalloc(size + L1_CACHE_BYTES, flags);
-	if (*base == NULL)
-		return NULL;
-
-	return (void *)L1_CACHE_ALIGN((u64)*base);
-}
-
-/*
- * Setup the channel structures necessary to support XPartition Communication
- * between the specified remote partition and the local one.
- */
-static enum xp_retval
-xpc_setup_ch_structures(struct xpc_partition *part)
-{
-	enum xp_retval ret;
-	int ch_number;
-	struct xpc_channel *ch;
-	short partid = XPC_PARTID(part);
-
-	/*
-	 * Allocate all of the channel structures as a contiguous chunk of
-	 * memory.
-	 */
-	DBUG_ON(part->channels != NULL);
-	part->channels = kzalloc(sizeof(struct xpc_channel) * XPC_MAX_NCHANNELS,
-				 GFP_KERNEL);
-	if (part->channels == NULL) {
-		dev_err(xpc_chan, "can't get memory for channels\n");
-		return xpNoMemory;
-	}
-
-	/* allocate the remote open and close args */
-
-	part->remote_openclose_args =
-	    xpc_kzalloc_cacheline_aligned(XPC_OPENCLOSE_ARGS_SIZE,
-					  GFP_KERNEL, &part->
-					  remote_openclose_args_base);
-	if (part->remote_openclose_args == NULL) {
-		dev_err(xpc_chan, "can't get memory for remote connect args\n");
-		ret = xpNoMemory;
-		goto out_1;
-	}
-
-	part->chctl.all_flags = 0;
-	spin_lock_init(&part->chctl_lock);
-
-	atomic_set(&part->channel_mgr_requests, 1);
-	init_waitqueue_head(&part->channel_mgr_wq);
-
-	part->nchannels = XPC_MAX_NCHANNELS;
-
-	atomic_set(&part->nchannels_active, 0);
-	atomic_set(&part->nchannels_engaged, 0);
-
-	for (ch_number = 0; ch_number < part->nchannels; ch_number++) {
-		ch = &part->channels[ch_number];
-
-		ch->partid = partid;
-		ch->number = ch_number;
-		ch->flags = XPC_C_DISCONNECTED;
-
-		atomic_set(&ch->kthreads_assigned, 0);
-		atomic_set(&ch->kthreads_idle, 0);
-		atomic_set(&ch->kthreads_active, 0);
-
-		atomic_set(&ch->references, 0);
-		atomic_set(&ch->n_to_notify, 0);
-
-		spin_lock_init(&ch->lock);
-		init_completion(&ch->wdisconnect_wait);
-
-		atomic_set(&ch->n_on_msg_allocate_wq, 0);
-		init_waitqueue_head(&ch->msg_allocate_wq);
-		init_waitqueue_head(&ch->idle_wq);
-	}
-
-	ret = xpc_arch_ops.setup_ch_structures(part);
-	if (ret != xpSuccess)
-		goto out_2;
-
-	/*
-	 * With the setting of the partition setup_state to XPC_P_SS_SETUP,
-	 * we're declaring that this partition is ready to go.
-	 */
-	part->setup_state = XPC_P_SS_SETUP;
-
-	return xpSuccess;
-
-	/* setup of ch structures failed */
-out_2:
-	kfree(part->remote_openclose_args_base);
-	part->remote_openclose_args = NULL;
-out_1:
-	kfree(part->channels);
-	part->channels = NULL;
-	return ret;
-}
-
-/*
- * Teardown the channel structures necessary to support XPartition Communication
- * between the specified remote partition and the local one.
- */
-static void
-xpc_teardown_ch_structures(struct xpc_partition *part)
-{
-	DBUG_ON(atomic_read(&part->nchannels_engaged) != 0);
-	DBUG_ON(atomic_read(&part->nchannels_active) != 0);
-
-	/*
-	 * Make this partition inaccessible to local processes by marking it
-	 * as no longer setup. Then wait before proceeding with the teardown
-	 * until all existing references cease.
-	 */
-	DBUG_ON(part->setup_state != XPC_P_SS_SETUP);
-	part->setup_state = XPC_P_SS_WTEARDOWN;
-
-	wait_event(part->teardown_wq, (atomic_read(&part->references) == 0));
-
-	/* now we can begin tearing down the infrastructure */
-
-	xpc_arch_ops.teardown_ch_structures(part);
-
-	kfree(part->remote_openclose_args_base);
-	part->remote_openclose_args = NULL;
-	kfree(part->channels);
-	part->channels = NULL;
-
-	part->setup_state = XPC_P_SS_TORNDOWN;
-}
-
-/*
- * When XPC HB determines that a partition has come up, it will create a new
- * kthread and that kthread will call this function to attempt to set up the
- * basic infrastructure used for Cross Partition Communication with the newly
- * upped partition.
- *
- * The kthread that was created by XPC HB and which setup the XPC
- * infrastructure will remain assigned to the partition becoming the channel
- * manager for that partition until the partition is deactivating, at which
- * time the kthread will teardown the XPC infrastructure and then exit.
- */
-static int
-xpc_activating(void *__partid)
-{
-	short partid = (u64)__partid;
-	struct xpc_partition *part = &xpc_partitions[partid];
-	unsigned long irq_flags;
-
-	DBUG_ON(partid < 0 || partid >= xp_max_npartitions);
-
-	spin_lock_irqsave(&part->act_lock, irq_flags);
-
-	if (part->act_state == XPC_P_AS_DEACTIVATING) {
-		part->act_state = XPC_P_AS_INACTIVE;
-		spin_unlock_irqrestore(&part->act_lock, irq_flags);
-		part->remote_rp_pa = 0;
-		return 0;
-	}
-
-	/* indicate the thread is activating */
-	DBUG_ON(part->act_state != XPC_P_AS_ACTIVATION_REQ);
-	part->act_state = XPC_P_AS_ACTIVATING;
-
-	XPC_SET_REASON(part, 0, 0);
-	spin_unlock_irqrestore(&part->act_lock, irq_flags);
-
-	dev_dbg(xpc_part, "activating partition %d\n", partid);
-
-	xpc_arch_ops.allow_hb(partid);
-
-	if (xpc_setup_ch_structures(part) == xpSuccess) {
-		(void)xpc_part_ref(part);	/* this will always succeed */
-
-		if (xpc_arch_ops.make_first_contact(part) == xpSuccess) {
-			xpc_mark_partition_active(part);
-			xpc_channel_mgr(part);
-			/* won't return until partition is deactivating */
-		}
-
-		xpc_part_deref(part);
-		xpc_teardown_ch_structures(part);
-	}
-
-	xpc_arch_ops.disallow_hb(partid);
-	xpc_mark_partition_inactive(part);
-
-	if (part->reason == xpReactivating) {
-		/* interrupting ourselves results in activating partition */
-		xpc_arch_ops.request_partition_reactivation(part);
-	}
-
-	return 0;
-}
-
-void
-xpc_activate_partition(struct xpc_partition *part)
-{
-	short partid = XPC_PARTID(part);
-	unsigned long irq_flags;
-	struct task_struct *kthread;
-
-	spin_lock_irqsave(&part->act_lock, irq_flags);
-
-	DBUG_ON(part->act_state != XPC_P_AS_INACTIVE);
-
-	part->act_state = XPC_P_AS_ACTIVATION_REQ;
-	XPC_SET_REASON(part, xpCloneKThread, __LINE__);
-
-	spin_unlock_irqrestore(&part->act_lock, irq_flags);
-
-	kthread = kthread_run(xpc_activating, (void *)((u64)partid), "xpc%02d",
-			      partid);
-	if (IS_ERR(kthread)) {
-		spin_lock_irqsave(&part->act_lock, irq_flags);
-		part->act_state = XPC_P_AS_INACTIVE;
-		XPC_SET_REASON(part, xpCloneKThreadFailed, __LINE__);
-		spin_unlock_irqrestore(&part->act_lock, irq_flags);
-	}
-}
-
-void
-xpc_activate_kthreads(struct xpc_channel *ch, int needed)
-{
-	int idle = atomic_read(&ch->kthreads_idle);
-	int assigned = atomic_read(&ch->kthreads_assigned);
-	int wakeup;
-
-	DBUG_ON(needed <= 0);
-
-	if (idle > 0) {
-		wakeup = (needed > idle) ? idle : needed;
-		needed -= wakeup;
-
-		dev_dbg(xpc_chan, "wakeup %d idle kthreads, partid=%d, "
-			"channel=%d\n", wakeup, ch->partid, ch->number);
-
-		/* only wakeup the requested number of kthreads */
-		wake_up_nr(&ch->idle_wq, wakeup);
-	}
-
-	if (needed <= 0)
-		return;
-
-	if (needed + assigned > ch->kthreads_assigned_limit) {
-		needed = ch->kthreads_assigned_limit - assigned;
-		if (needed <= 0)
-			return;
-	}
-
-	dev_dbg(xpc_chan, "create %d new kthreads, partid=%d, channel=%d\n",
-		needed, ch->partid, ch->number);
-
-	xpc_create_kthreads(ch, needed, 0);
-}
-
-/*
- * This function is where XPC's kthreads wait for messages to deliver.
- */
-static void
-xpc_kthread_waitmsgs(struct xpc_partition *part, struct xpc_channel *ch)
-{
-	int (*n_of_deliverable_payloads) (struct xpc_channel *) =
-		xpc_arch_ops.n_of_deliverable_payloads;
-
-	do {
-		/* deliver messages to their intended recipients */
-
-		while (n_of_deliverable_payloads(ch) > 0 &&
-		       !(ch->flags & XPC_C_DISCONNECTING)) {
-			xpc_deliver_payload(ch);
-		}
-
-		if (atomic_inc_return(&ch->kthreads_idle) >
-		    ch->kthreads_idle_limit) {
-			/* too many idle kthreads on this channel */
-			atomic_dec(&ch->kthreads_idle);
-			break;
-		}
-
-		dev_dbg(xpc_chan, "idle kthread calling "
-			"wait_event_interruptible_exclusive()\n");
-
-		(void)wait_event_interruptible_exclusive(ch->idle_wq,
-				(n_of_deliverable_payloads(ch) > 0 ||
-				 (ch->flags & XPC_C_DISCONNECTING)));
-
-		atomic_dec(&ch->kthreads_idle);
-
-	} while (!(ch->flags & XPC_C_DISCONNECTING));
-}
-
-static int
-xpc_kthread_start(void *args)
-{
-	short partid = XPC_UNPACK_ARG1(args);
-	u16 ch_number = XPC_UNPACK_ARG2(args);
-	struct xpc_partition *part = &xpc_partitions[partid];
-	struct xpc_channel *ch;
-	int n_needed;
-	unsigned long irq_flags;
-	int (*n_of_deliverable_payloads) (struct xpc_channel *) =
-		xpc_arch_ops.n_of_deliverable_payloads;
-
-	dev_dbg(xpc_chan, "kthread starting, partid=%d, channel=%d\n",
-		partid, ch_number);
-
-	ch = &part->channels[ch_number];
-
-	if (!(ch->flags & XPC_C_DISCONNECTING)) {
-
-		/* let registerer know that connection has been established */
-
-		spin_lock_irqsave(&ch->lock, irq_flags);
-		if (!(ch->flags & XPC_C_CONNECTEDCALLOUT)) {
-			ch->flags |= XPC_C_CONNECTEDCALLOUT;
-			spin_unlock_irqrestore(&ch->lock, irq_flags);
-
-			xpc_connected_callout(ch);
-
-			spin_lock_irqsave(&ch->lock, irq_flags);
-			ch->flags |= XPC_C_CONNECTEDCALLOUT_MADE;
-			spin_unlock_irqrestore(&ch->lock, irq_flags);
-
-			/*
-			 * It is possible that while the callout was being
-			 * made that the remote partition sent some messages.
-			 * If that is the case, we may need to activate
-			 * additional kthreads to help deliver them. We only
-			 * need one less than total #of messages to deliver.
-			 */
-			n_needed = n_of_deliverable_payloads(ch) - 1;
-			if (n_needed > 0 && !(ch->flags & XPC_C_DISCONNECTING))
-				xpc_activate_kthreads(ch, n_needed);
-
-		} else {
-			spin_unlock_irqrestore(&ch->lock, irq_flags);
-		}
-
-		xpc_kthread_waitmsgs(part, ch);
-	}
-
-	/* let registerer know that connection is disconnecting */
-
-	spin_lock_irqsave(&ch->lock, irq_flags);
-	if ((ch->flags & XPC_C_CONNECTEDCALLOUT_MADE) &&
-	    !(ch->flags & XPC_C_DISCONNECTINGCALLOUT)) {
-		ch->flags |= XPC_C_DISCONNECTINGCALLOUT;
-		spin_unlock_irqrestore(&ch->lock, irq_flags);
-
-		xpc_disconnect_callout(ch, xpDisconnecting);
-
-		spin_lock_irqsave(&ch->lock, irq_flags);
-		ch->flags |= XPC_C_DISCONNECTINGCALLOUT_MADE;
-	}
-	spin_unlock_irqrestore(&ch->lock, irq_flags);
-
-	if (atomic_dec_return(&ch->kthreads_assigned) == 0 &&
-	    atomic_dec_return(&part->nchannels_engaged) == 0) {
-		xpc_arch_ops.indicate_partition_disengaged(part);
-	}
-
-	xpc_msgqueue_deref(ch);
-
-	dev_dbg(xpc_chan, "kthread exiting, partid=%d, channel=%d\n",
-		partid, ch_number);
-
-	xpc_part_deref(part);
-	return 0;
-}
-
-/*
- * For each partition that XPC has established communications with, there is
- * a minimum of one kernel thread assigned to perform any operation that
- * may potentially sleep or block (basically the callouts to the asynchronous
- * functions registered via xpc_connect()).
- *
- * Additional kthreads are created and destroyed by XPC as the workload
- * demands.
- *
- * A kthread is assigned to one of the active channels that exists for a given
- * partition.
- */
-void
-xpc_create_kthreads(struct xpc_channel *ch, int needed,
-		    int ignore_disconnecting)
-{
-	unsigned long irq_flags;
-	u64 args = XPC_PACK_ARGS(ch->partid, ch->number);
-	struct xpc_partition *part = &xpc_partitions[ch->partid];
-	struct task_struct *kthread;
-	void (*indicate_partition_disengaged) (struct xpc_partition *) =
-		xpc_arch_ops.indicate_partition_disengaged;
-
-	while (needed-- > 0) {
-
-		/*
-		 * The following is done on behalf of the newly created
-		 * kthread. That kthread is responsible for doing the
-		 * counterpart to the following before it exits.
-		 */
-		if (ignore_disconnecting) {
-			if (!atomic_inc_not_zero(&ch->kthreads_assigned)) {
-				/* kthreads assigned had gone to zero */
-				BUG_ON(!(ch->flags &
-					 XPC_C_DISCONNECTINGCALLOUT_MADE));
-				break;
-			}
-
-		} else if (ch->flags & XPC_C_DISCONNECTING) {
-			break;
-
-		} else if (atomic_inc_return(&ch->kthreads_assigned) == 1 &&
-			   atomic_inc_return(&part->nchannels_engaged) == 1) {
-			xpc_arch_ops.indicate_partition_engaged(part);
-		}
-		(void)xpc_part_ref(part);
-		xpc_msgqueue_ref(ch);
-
-		kthread = kthread_run(xpc_kthread_start, (void *)args,
-				      "xpc%02dc%d", ch->partid, ch->number);
-		if (IS_ERR(kthread)) {
-			/* the fork failed */
-
-			/*
-			 * NOTE: if (ignore_disconnecting &&
-			 * !(ch->flags & XPC_C_DISCONNECTINGCALLOUT)) is true,
-			 * then we'll deadlock if all other kthreads assigned
-			 * to this channel are blocked in the channel's
-			 * registerer, because the only thing that will unblock
-			 * them is the xpDisconnecting callout that this
-			 * failed kthread_run() would have made.
-			 */
-
-			if (atomic_dec_return(&ch->kthreads_assigned) == 0 &&
-			    atomic_dec_return(&part->nchannels_engaged) == 0) {
-				indicate_partition_disengaged(part);
-			}
-			xpc_msgqueue_deref(ch);
-			xpc_part_deref(part);
-
-			if (atomic_read(&ch->kthreads_assigned) <
-			    ch->kthreads_idle_limit) {
-				/*
-				 * Flag this as an error only if we have an
-				 * insufficient #of kthreads for the channel
-				 * to function.
-				 */
-				spin_lock_irqsave(&ch->lock, irq_flags);
-				XPC_DISCONNECT_CHANNEL(ch, xpLackOfResources,
-						       &irq_flags);
-				spin_unlock_irqrestore(&ch->lock, irq_flags);
-			}
-			break;
-		}
-	}
-}
-
-void
-xpc_disconnect_wait(int ch_number)
-{
-	unsigned long irq_flags;
-	short partid;
-	struct xpc_partition *part;
-	struct xpc_channel *ch;
-	int wakeup_channel_mgr;
-
-	/* now wait for all callouts to the caller's function to cease */
-	for (partid = 0; partid < xp_max_npartitions; partid++) {
-		part = &xpc_partitions[partid];
-
-		if (!xpc_part_ref(part))
-			continue;
-
-		ch = &part->channels[ch_number];
-
-		if (!(ch->flags & XPC_C_WDISCONNECT)) {
-			xpc_part_deref(part);
-			continue;
-		}
-
-		wait_for_completion(&ch->wdisconnect_wait);
-
-		spin_lock_irqsave(&ch->lock, irq_flags);
-		DBUG_ON(!(ch->flags & XPC_C_DISCONNECTED));
-		wakeup_channel_mgr = 0;
-
-		if (ch->delayed_chctl_flags) {
-			if (part->act_state != XPC_P_AS_DEACTIVATING) {
-				spin_lock(&part->chctl_lock);
-				part->chctl.flags[ch->number] |=
-				    ch->delayed_chctl_flags;
-				spin_unlock(&part->chctl_lock);
-				wakeup_channel_mgr = 1;
-			}
-			ch->delayed_chctl_flags = 0;
-		}
-
-		ch->flags &= ~XPC_C_WDISCONNECT;
-		spin_unlock_irqrestore(&ch->lock, irq_flags);
-
-		if (wakeup_channel_mgr)
-			xpc_wakeup_channel_mgr(part);
-
-		xpc_part_deref(part);
-	}
-}
-
-static int
-xpc_setup_partitions(void)
-{
-	short partid;
-	struct xpc_partition *part;
-
-	xpc_partitions = kzalloc(sizeof(struct xpc_partition) *
-				 xp_max_npartitions, GFP_KERNEL);
-	if (xpc_partitions == NULL) {
-		dev_err(xpc_part, "can't get memory for partition structure\n");
-		return -ENOMEM;
-	}
-
-	/*
-	 * The first few fields of each entry of xpc_partitions[] need to
-	 * be initialized now so that calls to xpc_connect() and
-	 * xpc_disconnect() can be made prior to the activation of any remote
-	 * partition. NOTE THAT NONE OF THE OTHER FIELDS BELONGING TO THESE
-	 * ENTRIES ARE MEANINGFUL UNTIL AFTER AN ENTRY'S CORRESPONDING
-	 * PARTITION HAS BEEN ACTIVATED.
-	 */
-	for (partid = 0; partid < xp_max_npartitions; partid++) {
-		part = &xpc_partitions[partid];
-
-		DBUG_ON((u64)part != L1_CACHE_ALIGN((u64)part));
-
-		part->activate_IRQ_rcvd = 0;
-		spin_lock_init(&part->act_lock);
-		part->act_state = XPC_P_AS_INACTIVE;
-		XPC_SET_REASON(part, 0, 0);
-
-		init_timer(&part->disengage_timer);
-		part->disengage_timer.function =
-		    xpc_timeout_partition_disengage;
-		part->disengage_timer.data = (unsigned long)part;
-
-		part->setup_state = XPC_P_SS_UNSET;
-		init_waitqueue_head(&part->teardown_wq);
-		atomic_set(&part->references, 0);
-	}
-
-	return xpc_arch_ops.setup_partitions();
-}
-
-static void
-xpc_teardown_partitions(void)
-{
-	xpc_arch_ops.teardown_partitions();
-	kfree(xpc_partitions);
-}
-
-static void
-xpc_do_exit(enum xp_retval reason)
-{
-	short partid;
-	int active_part_count, printed_waiting_msg = 0;
-	struct xpc_partition *part;
-	unsigned long printmsg_time, disengage_timeout = 0;
-
-	/* a 'rmmod XPC' and a 'reboot' cannot both end up here together */
-	DBUG_ON(xpc_exiting == 1);
-
-	/*
-	 * Let the heartbeat checker thread and the discovery thread
-	 * (if one is running) know that they should exit. Also wake up
-	 * the heartbeat checker thread in case it's sleeping.
-	 */
-	xpc_exiting = 1;
-	wake_up_interruptible(&xpc_activate_IRQ_wq);
-
-	/* wait for the discovery thread to exit */
-	wait_for_completion(&xpc_discovery_exited);
-
-	/* wait for the heartbeat checker thread to exit */
-	wait_for_completion(&xpc_hb_checker_exited);
-
-	/* sleep for a 1/3 of a second or so */
-	(void)msleep_interruptible(300);
-
-	/* wait for all partitions to become inactive */
-
-	printmsg_time = jiffies + (XPC_DEACTIVATE_PRINTMSG_INTERVAL * HZ);
-	xpc_disengage_timedout = 0;
-
-	do {
-		active_part_count = 0;
-
-		for (partid = 0; partid < xp_max_npartitions; partid++) {
-			part = &xpc_partitions[partid];
-
-			if (xpc_partition_disengaged(part) &&
-			    part->act_state == XPC_P_AS_INACTIVE) {
-				continue;
-			}
-
-			active_part_count++;
-
-			XPC_DEACTIVATE_PARTITION(part, reason);
-
-			if (part->disengage_timeout > disengage_timeout)
-				disengage_timeout = part->disengage_timeout;
-		}
-
-		if (xpc_arch_ops.any_partition_engaged()) {
-			if (time_is_before_jiffies(printmsg_time)) {
-				dev_info(xpc_part, "waiting for remote "
-					 "partitions to deactivate, timeout in "
-					 "%ld seconds\n", (disengage_timeout -
-					 jiffies) / HZ);
-				printmsg_time = jiffies +
-				    (XPC_DEACTIVATE_PRINTMSG_INTERVAL * HZ);
-				printed_waiting_msg = 1;
-			}
-
-		} else if (active_part_count > 0) {
-			if (printed_waiting_msg) {
-				dev_info(xpc_part, "waiting for local partition"
-					 " to deactivate\n");
-				printed_waiting_msg = 0;
-			}
-
-		} else {
-			if (!xpc_disengage_timedout) {
-				dev_info(xpc_part, "all partitions have "
-					 "deactivated\n");
-			}
-			break;
-		}
-
-		/* sleep for a 1/3 of a second or so */
-		(void)msleep_interruptible(300);
-
-	} while (1);
-
-	DBUG_ON(xpc_arch_ops.any_partition_engaged());
-
-	xpc_teardown_rsvd_page();
-
-	if (reason == xpUnloading) {
-		(void)unregister_die_notifier(&xpc_die_notifier);
-		(void)unregister_reboot_notifier(&xpc_reboot_notifier);
-	}
-
-	/* clear the interface to XPC's functions */
-	xpc_clear_interface();
-
-	if (xpc_sysctl)
-		unregister_sysctl_table(xpc_sysctl);
-
-	xpc_teardown_partitions();
-
-	if (is_shub())
-		xpc_exit_sn2();
-	else if (is_uv())
-		xpc_exit_uv();
-}
-
-/*
- * This function is called when the system is being rebooted.
- */
-static int
-xpc_system_reboot(struct notifier_block *nb, unsigned long event, void *unused)
-{
-	enum xp_retval reason;
-
-	switch (event) {
-	case SYS_RESTART:
-		reason = xpSystemReboot;
-		break;
-	case SYS_HALT:
-		reason = xpSystemHalt;
-		break;
-	case SYS_POWER_OFF:
-		reason = xpSystemPoweroff;
-		break;
-	default:
-		reason = xpSystemGoingDown;
-	}
-
-	xpc_do_exit(reason);
-	return NOTIFY_DONE;
-}
-
-/*
- * Notify other partitions to deactivate from us by first disengaging from all
- * references to our memory.
- */
-static void
-xpc_die_deactivate(void)
-{
-	struct xpc_partition *part;
-	short partid;
-	int any_engaged;
-	long keep_waiting;
-	long wait_to_print;
-
-	/* keep xpc_hb_checker thread from doing anything (just in case) */
-	xpc_exiting = 1;
-
-	xpc_arch_ops.disallow_all_hbs();   /*indicate we're deactivated */
-
-	for (partid = 0; partid < xp_max_npartitions; partid++) {
-		part = &xpc_partitions[partid];
-
-		if (xpc_arch_ops.partition_engaged(partid) ||
-		    part->act_state != XPC_P_AS_INACTIVE) {
-			xpc_arch_ops.request_partition_deactivation(part);
-			xpc_arch_ops.indicate_partition_disengaged(part);
-		}
-	}
-
-	/*
-	 * Though we requested that all other partitions deactivate from us,
-	 * we only wait until they've all disengaged or we've reached the
-	 * defined timelimit.
-	 *
-	 * Given that one iteration through the following while-loop takes
-	 * approximately 200 microseconds, calculate the #of loops to take
-	 * before bailing and the #of loops before printing a waiting message.
-	 */
-	keep_waiting = xpc_disengage_timelimit * 1000 * 5;
-	wait_to_print = XPC_DEACTIVATE_PRINTMSG_INTERVAL * 1000 * 5;
-
-	while (1) {
-		any_engaged = xpc_arch_ops.any_partition_engaged();
-		if (!any_engaged) {
-			dev_info(xpc_part, "all partitions have deactivated\n");
-			break;
-		}
-
-		if (!keep_waiting--) {
-			for (partid = 0; partid < xp_max_npartitions;
-			     partid++) {
-				if (xpc_arch_ops.partition_engaged(partid)) {
-					dev_info(xpc_part, "deactivate from "
-						 "remote partition %d timed "
-						 "out\n", partid);
-				}
-			}
-			break;
-		}
-
-		if (!wait_to_print--) {
-			dev_info(xpc_part, "waiting for remote partitions to "
-				 "deactivate, timeout in %ld seconds\n",
-				 keep_waiting / (1000 * 5));
-			wait_to_print = XPC_DEACTIVATE_PRINTMSG_INTERVAL *
-			    1000 * 5;
-		}
-
-		udelay(200);
-	}
-}
-
-/*
- * This function is called when the system is being restarted or halted due
- * to some sort of system failure. If this is the case we need to notify the
- * other partitions to disengage from all references to our memory.
- * This function can also be called when our heartbeater could be offlined
- * for a time. In this case we need to notify other partitions to not worry
- * about the lack of a heartbeat.
- */
-static int
-xpc_system_die(struct notifier_block *nb, unsigned long event, void *unused)
-{
-#ifdef CONFIG_IA64		/* !!! temporary kludge */
-	switch (event) {
-	case DIE_MACHINE_RESTART:
-	case DIE_MACHINE_HALT:
-		xpc_die_deactivate();
-		break;
-
-	case DIE_KDEBUG_ENTER:
-		/* Should lack of heartbeat be ignored by other partitions? */
-		if (!xpc_kdebug_ignore)
-			break;
-
-		/* fall through */
-	case DIE_MCA_MONARCH_ENTER:
-	case DIE_INIT_MONARCH_ENTER:
-		xpc_arch_ops.offline_heartbeat();
-		break;
-
-	case DIE_KDEBUG_LEAVE:
-		/* Is lack of heartbeat being ignored by other partitions? */
-		if (!xpc_kdebug_ignore)
-			break;
-
-		/* fall through */
-	case DIE_MCA_MONARCH_LEAVE:
-	case DIE_INIT_MONARCH_LEAVE:
-		xpc_arch_ops.online_heartbeat();
-		break;
-	}
-#else
-	xpc_die_deactivate();
-#endif
-
-	return NOTIFY_DONE;
-}
-
-int __init
-xpc_init(void)
-{
-	int ret;
-	struct task_struct *kthread;
-
-	dev_set_name(xpc_part, "part");
-	dev_set_name(xpc_chan, "chan");
-
-	if (is_shub()) {
-		/*
-		 * The ia64-sn2 architecture supports at most 64 partitions.
-		 * And the inability to unregister remote amos restricts us
-		 * further to only support exactly 64 partitions on this
-		 * architecture, no less.
-		 */
-		if (xp_max_npartitions != 64) {
-			dev_err(xpc_part, "max #of partitions not set to 64\n");
-			ret = -EINVAL;
-		} else {
-			ret = xpc_init_sn2();
-		}
-
-	} else if (is_uv()) {
-		ret = xpc_init_uv();
-
-	} else {
-		ret = -ENODEV;
-	}
-
-	if (ret != 0)
-		return ret;
-
-	ret = xpc_setup_partitions();
-	if (ret != 0) {
-		dev_err(xpc_part, "can't get memory for partition structure\n");
-		goto out_1;
-	}
-
-	xpc_sysctl = register_sysctl_table(xpc_sys_dir);
-
-	/*
-	 * Fill the partition reserved page with the information needed by
-	 * other partitions to discover we are alive and establish initial
-	 * communications.
-	 */
-	ret = xpc_setup_rsvd_page();
-	if (ret != 0) {
-		dev_err(xpc_part, "can't setup our reserved page\n");
-		goto out_2;
-	}
-
-	/* add ourselves to the reboot_notifier_list */
-	ret = register_reboot_notifier(&xpc_reboot_notifier);
-	if (ret != 0)
-		dev_warn(xpc_part, "can't register reboot notifier\n");
-
-	/* add ourselves to the die_notifier list */
-	ret = register_die_notifier(&xpc_die_notifier);
-	if (ret != 0)
-		dev_warn(xpc_part, "can't register die notifier\n");
-
-	/*
-	 * The real work-horse behind xpc.  This processes incoming
-	 * interrupts and monitors remote heartbeats.
-	 */
-	kthread = kthread_run(xpc_hb_checker, NULL, XPC_HB_CHECK_THREAD_NAME);
-	if (IS_ERR(kthread)) {
-		dev_err(xpc_part, "failed while forking hb check thread\n");
-		ret = -EBUSY;
-		goto out_3;
-	}
-
-	/*
-	 * Startup a thread that will attempt to discover other partitions to
-	 * activate based on info provided by SAL. This new thread is short
-	 * lived and will exit once discovery is complete.
-	 */
-	kthread = kthread_run(xpc_initiate_discovery, NULL,
-			      XPC_DISCOVERY_THREAD_NAME);
-	if (IS_ERR(kthread)) {
-		dev_err(xpc_part, "failed while forking discovery thread\n");
-
-		/* mark this new thread as a non-starter */
-		complete(&xpc_discovery_exited);
-
-		xpc_do_exit(xpUnloading);
-		return -EBUSY;
-	}
-
-	/* set the interface to point at XPC's functions */
-	xpc_set_interface(xpc_initiate_connect, xpc_initiate_disconnect,
-			  xpc_initiate_send, xpc_initiate_send_notify,
-			  xpc_initiate_received, xpc_initiate_partid_to_nasids);
-
-	return 0;
-
-	/* initialization was not successful */
-out_3:
-	xpc_teardown_rsvd_page();
-
-	(void)unregister_die_notifier(&xpc_die_notifier);
-	(void)unregister_reboot_notifier(&xpc_reboot_notifier);
-out_2:
-	if (xpc_sysctl)
-		unregister_sysctl_table(xpc_sysctl);
-
-	xpc_teardown_partitions();
-out_1:
-	if (is_shub())
-		xpc_exit_sn2();
-	else if (is_uv())
-		xpc_exit_uv();
-	return ret;
-}
-
-module_init(xpc_init);
-
-void __exit
-xpc_exit(void)
-{
-	xpc_do_exit(xpUnloading);
-}
-
-module_exit(xpc_exit);
-
-MODULE_AUTHOR("Silicon Graphics, Inc.");
-MODULE_DESCRIPTION("Cross Partition Communication (XPC) support");
-MODULE_LICENSE("GPL");
-
-module_param(xpc_hb_interval, int, 0);
-MODULE_PARM_DESC(xpc_hb_interval, "Number of seconds between "
-		 "heartbeat increments.");
-
-module_param(xpc_hb_check_interval, int, 0);
-MODULE_PARM_DESC(xpc_hb_check_interval, "Number of seconds between "
-		 "heartbeat checks.");
-
-module_param(xpc_disengage_timelimit, int, 0);
-MODULE_PARM_DESC(xpc_disengage_timelimit, "Number of seconds to wait "
-		 "for disengage to complete.");
-
-module_param(xpc_kdebug_ignore, int, 0);
-MODULE_PARM_DESC(xpc_kdebug_ignore, "Should lack of heartbeat be ignored by "
-		 "other partitions when dropping into kdebug.");