x86: Move uv to platform

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Mike Travis <travis@sgi.com>

1 files changed, 0 insertions, 1661 deletions

diff --git a/arch/x86/kernel/tlb_uv.c b/arch/x86/kernel/tlb_uv.c
deleted file mode 100644
index 20ea20a39e2a..000000000000
--- a/arch/x86/kernel/tlb_uv.c
+++ /dev/null
@@ -1,1661 +0,0 @@
-/*
- *	SGI UltraViolet TLB flush routines.
- *
- *	(c) 2008-2010 Cliff Wickman <cpw@sgi.com>, SGI.
- *
- *	This code is released under the GNU General Public License version 2 or
- *	later.
- */
-#include <linux/seq_file.h>
-#include <linux/proc_fs.h>
-#include <linux/debugfs.h>
-#include <linux/kernel.h>
-#include <linux/slab.h>
-
-#include <asm/mmu_context.h>
-#include <asm/uv/uv.h>
-#include <asm/uv/uv_mmrs.h>
-#include <asm/uv/uv_hub.h>
-#include <asm/uv/uv_bau.h>
-#include <asm/apic.h>
-#include <asm/idle.h>
-#include <asm/tsc.h>
-#include <asm/irq_vectors.h>
-#include <asm/timer.h>
-
-/* timeouts in nanoseconds (indexed by UVH_AGING_PRESCALE_SEL urgency7 30:28) */
-static int timeout_base_ns[] = {
-		20,
-		160,
-		1280,
-		10240,
-		81920,
-		655360,
-		5242880,
-		167772160
-};
-static int timeout_us;
-static int nobau;
-static int baudisabled;
-static spinlock_t disable_lock;
-static cycles_t congested_cycles;
-
-/* tunables: */
-static int max_bau_concurrent = MAX_BAU_CONCURRENT;
-static int max_bau_concurrent_constant = MAX_BAU_CONCURRENT;
-static int plugged_delay = PLUGGED_DELAY;
-static int plugsb4reset = PLUGSB4RESET;
-static int timeoutsb4reset = TIMEOUTSB4RESET;
-static int ipi_reset_limit = IPI_RESET_LIMIT;
-static int complete_threshold = COMPLETE_THRESHOLD;
-static int congested_response_us = CONGESTED_RESPONSE_US;
-static int congested_reps = CONGESTED_REPS;
-static int congested_period = CONGESTED_PERIOD;
-static struct dentry *tunables_dir;
-static struct dentry *tunables_file;
-
-static int __init setup_nobau(char *arg)
-{
-	nobau = 1;
-	return 0;
-}
-early_param("nobau", setup_nobau);
-
-/* base pnode in this partition */
-static int uv_partition_base_pnode __read_mostly;
-/* position of pnode (which is nasid>>1): */
-static int uv_nshift __read_mostly;
-static unsigned long uv_mmask __read_mostly;
-
-static DEFINE_PER_CPU(struct ptc_stats, ptcstats);
-static DEFINE_PER_CPU(struct bau_control, bau_control);
-static DEFINE_PER_CPU(cpumask_var_t, uv_flush_tlb_mask);
-
-/*
- * Determine the first node on a uvhub. 'Nodes' are used for kernel
- * memory allocation.
- */
-static int __init uvhub_to_first_node(int uvhub)
-{
-	int node, b;
-
-	for_each_online_node(node) {
-		b = uv_node_to_blade_id(node);
-		if (uvhub == b)
-			return node;
-	}
-	return -1;
-}
-
-/*
- * Determine the apicid of the first cpu on a uvhub.
- */
-static int __init uvhub_to_first_apicid(int uvhub)
-{
-	int cpu;
-
-	for_each_present_cpu(cpu)
-		if (uvhub == uv_cpu_to_blade_id(cpu))
-			return per_cpu(x86_cpu_to_apicid, cpu);
-	return -1;
-}
-
-/*
- * Free a software acknowledge hardware resource by clearing its Pending
- * bit. This will return a reply to the sender.
- * If the message has timed out, a reply has already been sent by the
- * hardware but the resource has not been released. In that case our
- * clear of the Timeout bit (as well) will free the resource. No reply will
- * be sent (the hardware will only do one reply per message).
- */
-static inline void uv_reply_to_message(struct msg_desc *mdp,
-				       struct bau_control *bcp)
-{
-	unsigned long dw;
-	struct bau_payload_queue_entry *msg;
-
-	msg = mdp->msg;
-	if (!msg->canceled) {
-		dw = (msg->sw_ack_vector << UV_SW_ACK_NPENDING) |
-						msg->sw_ack_vector;
-		uv_write_local_mmr(
-				UVH_LB_BAU_INTD_SOFTWARE_ACKNOWLEDGE_ALIAS, dw);
-	}
-	msg->replied_to = 1;
-	msg->sw_ack_vector = 0;
-}
-
-/*
- * Process the receipt of a RETRY message
- */
-static inline void uv_bau_process_retry_msg(struct msg_desc *mdp,
-					    struct bau_control *bcp)
-{
-	int i;
-	int cancel_count = 0;
-	int slot2;
-	unsigned long msg_res;
-	unsigned long mmr = 0;
-	struct bau_payload_queue_entry *msg;
-	struct bau_payload_queue_entry *msg2;
-	struct ptc_stats *stat;
-
-	msg = mdp->msg;
-	stat = bcp->statp;
-	stat->d_retries++;
-	/*
-	 * cancel any message from msg+1 to the retry itself
-	 */
-	for (msg2 = msg+1, i = 0; i < DEST_Q_SIZE; msg2++, i++) {
-		if (msg2 > mdp->va_queue_last)
-			msg2 = mdp->va_queue_first;
-		if (msg2 == msg)
-			break;
-
-		/* same conditions for cancellation as uv_do_reset */
-		if ((msg2->replied_to == 0) && (msg2->canceled == 0) &&
-		    (msg2->sw_ack_vector) && ((msg2->sw_ack_vector &
-			msg->sw_ack_vector) == 0) &&
-		    (msg2->sending_cpu == msg->sending_cpu) &&
-		    (msg2->msg_type != MSG_NOOP)) {
-			slot2 = msg2 - mdp->va_queue_first;
-			mmr = uv_read_local_mmr
-				(UVH_LB_BAU_INTD_SOFTWARE_ACKNOWLEDGE);
-			msg_res = msg2->sw_ack_vector;
-			/*
-			 * This is a message retry; clear the resources held
-			 * by the previous message only if they timed out.
-			 * If it has not timed out we have an unexpected
-			 * situation to report.
-			 */
-			if (mmr & (msg_res << UV_SW_ACK_NPENDING)) {
-				/*
-				 * is the resource timed out?
-				 * make everyone ignore the cancelled message.
-				 */
-				msg2->canceled = 1;
-				stat->d_canceled++;
-				cancel_count++;
-				uv_write_local_mmr(
-				    UVH_LB_BAU_INTD_SOFTWARE_ACKNOWLEDGE_ALIAS,
-					(msg_res << UV_SW_ACK_NPENDING) |
-					 msg_res);
-			}
-		}
-	}
-	if (!cancel_count)
-		stat->d_nocanceled++;
-}
-
-/*
- * Do all the things a cpu should do for a TLB shootdown message.
- * Other cpu's may come here at the same time for this message.
- */
-static void uv_bau_process_message(struct msg_desc *mdp,
-				   struct bau_control *bcp)
-{
-	int msg_ack_count;
-	short socket_ack_count = 0;
-	struct ptc_stats *stat;
-	struct bau_payload_queue_entry *msg;
-	struct bau_control *smaster = bcp->socket_master;
-
-	/*
-	 * This must be a normal message, or retry of a normal message
-	 */
-	msg = mdp->msg;
-	stat = bcp->statp;
-	if (msg->address == TLB_FLUSH_ALL) {
-		local_flush_tlb();
-		stat->d_alltlb++;
-	} else {
-		__flush_tlb_one(msg->address);
-		stat->d_onetlb++;
-	}
-	stat->d_requestee++;
-
-	/*
-	 * One cpu on each uvhub has the additional job on a RETRY
-	 * of releasing the resource held by the message that is
-	 * being retried.  That message is identified by sending
-	 * cpu number.
-	 */
-	if (msg->msg_type == MSG_RETRY && bcp == bcp->uvhub_master)
-		uv_bau_process_retry_msg(mdp, bcp);
-
-	/*
-	 * This is a sw_ack message, so we have to reply to it.
-	 * Count each responding cpu on the socket. This avoids
-	 * pinging the count's cache line back and forth between
-	 * the sockets.
-	 */
-	socket_ack_count = atomic_add_short_return(1, (struct atomic_short *)
-			&smaster->socket_acknowledge_count[mdp->msg_slot]);
-	if (socket_ack_count == bcp->cpus_in_socket) {
-		/*
-		 * Both sockets dump their completed count total into
-		 * the message's count.
-		 */
-		smaster->socket_acknowledge_count[mdp->msg_slot] = 0;
-		msg_ack_count = atomic_add_short_return(socket_ack_count,
-				(struct atomic_short *)&msg->acknowledge_count);
-
-		if (msg_ack_count == bcp->cpus_in_uvhub) {
-			/*
-			 * All cpus in uvhub saw it; reply
-			 */
-			uv_reply_to_message(mdp, bcp);
-		}
-	}
-
-	return;
-}
-
-/*
- * Determine the first cpu on a uvhub.
- */
-static int uvhub_to_first_cpu(int uvhub)
-{
-	int cpu;
-	for_each_present_cpu(cpu)
-		if (uvhub == uv_cpu_to_blade_id(cpu))
-			return cpu;
-	return -1;
-}
-
-/*
- * Last resort when we get a large number of destination timeouts is
- * to clear resources held by a given cpu.
- * Do this with IPI so that all messages in the BAU message queue
- * can be identified by their nonzero sw_ack_vector field.
- *
- * This is entered for a single cpu on the uvhub.
- * The sender want's this uvhub to free a specific message's
- * sw_ack resources.
- */
-static void
-uv_do_reset(void *ptr)
-{
-	int i;
-	int slot;
-	int count = 0;
-	unsigned long mmr;
-	unsigned long msg_res;
-	struct bau_control *bcp;
-	struct reset_args *rap;
-	struct bau_payload_queue_entry *msg;
-	struct ptc_stats *stat;
-
-	bcp = &per_cpu(bau_control, smp_processor_id());
-	rap = (struct reset_args *)ptr;
-	stat = bcp->statp;
-	stat->d_resets++;
-
-	/*
-	 * We're looking for the given sender, and
-	 * will free its sw_ack resource.
-	 * If all cpu's finally responded after the timeout, its
-	 * message 'replied_to' was set.
-	 */
-	for (msg = bcp->va_queue_first, i = 0; i < DEST_Q_SIZE; msg++, i++) {
-		/* uv_do_reset: same conditions for cancellation as
-		   uv_bau_process_retry_msg() */
-		if ((msg->replied_to == 0) &&
-		    (msg->canceled == 0) &&
-		    (msg->sending_cpu == rap->sender) &&
-		    (msg->sw_ack_vector) &&
-		    (msg->msg_type != MSG_NOOP)) {
-			/*
-			 * make everyone else ignore this message
-			 */
-			msg->canceled = 1;
-			slot = msg - bcp->va_queue_first;
-			count++;
-			/*
-			 * only reset the resource if it is still pending
-			 */
-			mmr = uv_read_local_mmr
-					(UVH_LB_BAU_INTD_SOFTWARE_ACKNOWLEDGE);
-			msg_res = msg->sw_ack_vector;
-			if (mmr & msg_res) {
-				stat->d_rcanceled++;
-				uv_write_local_mmr(
-				    UVH_LB_BAU_INTD_SOFTWARE_ACKNOWLEDGE_ALIAS,
-					(msg_res << UV_SW_ACK_NPENDING) |
-					 msg_res);
-			}
-		}
-	}
-	return;
-}
-
-/*
- * Use IPI to get all target uvhubs to release resources held by
- * a given sending cpu number.
- */
-static void uv_reset_with_ipi(struct bau_target_uvhubmask *distribution,
-			      int sender)
-{
-	int uvhub;
-	int cpu;
-	cpumask_t mask;
-	struct reset_args reset_args;
-
-	reset_args.sender = sender;
-
-	cpus_clear(mask);
-	/* find a single cpu for each uvhub in this distribution mask */
-	for (uvhub = 0;
-		    uvhub < sizeof(struct bau_target_uvhubmask) * BITSPERBYTE;
-		    uvhub++) {
-		if (!bau_uvhub_isset(uvhub, distribution))
-			continue;
-		/* find a cpu for this uvhub */
-		cpu = uvhub_to_first_cpu(uvhub);
-		cpu_set(cpu, mask);
-	}
-	/* IPI all cpus; Preemption is already disabled */
-	smp_call_function_many(&mask, uv_do_reset, (void *)&reset_args, 1);
-	return;
-}
-
-static inline unsigned long
-cycles_2_us(unsigned long long cyc)
-{
-	unsigned long long ns;
-	unsigned long us;
-	ns =  (cyc * per_cpu(cyc2ns, smp_processor_id()))
-						>> CYC2NS_SCALE_FACTOR;
-	us = ns / 1000;
-	return us;
-}
-
-/*
- * wait for all cpus on this hub to finish their sends and go quiet
- * leaves uvhub_quiesce set so that no new broadcasts are started by
- * bau_flush_send_and_wait()
- */
-static inline void
-quiesce_local_uvhub(struct bau_control *hmaster)
-{
-	atomic_add_short_return(1, (struct atomic_short *)
-		 &hmaster->uvhub_quiesce);
-}
-
-/*
- * mark this quiet-requestor as done
- */
-static inline void
-end_uvhub_quiesce(struct bau_control *hmaster)
-{
-	atomic_add_short_return(-1, (struct atomic_short *)
-		&hmaster->uvhub_quiesce);
-}
-
-/*
- * Wait for completion of a broadcast software ack message
- * return COMPLETE, RETRY(PLUGGED or TIMEOUT) or GIVEUP
- */
-static int uv_wait_completion(struct bau_desc *bau_desc,
-	unsigned long mmr_offset, int right_shift, int this_cpu,
-	struct bau_control *bcp, struct bau_control *smaster, long try)
-{
-	unsigned long descriptor_status;
-	cycles_t ttime;
-	struct ptc_stats *stat = bcp->statp;
-	struct bau_control *hmaster;
-
-	hmaster = bcp->uvhub_master;
-
-	/* spin on the status MMR, waiting for it to go idle */
-	while ((descriptor_status = (((unsigned long)
-		uv_read_local_mmr(mmr_offset) >>
-			right_shift) & UV_ACT_STATUS_MASK)) !=
-			DESC_STATUS_IDLE) {
-		/*
-		 * Our software ack messages may be blocked because there are
-		 * no swack resources available.  As long as none of them
-		 * has timed out hardware will NACK our message and its
-		 * state will stay IDLE.
-		 */
-		if (descriptor_status == DESC_STATUS_SOURCE_TIMEOUT) {
-			stat->s_stimeout++;
-			return FLUSH_GIVEUP;
-		} else if (descriptor_status ==
-					DESC_STATUS_DESTINATION_TIMEOUT) {
-			stat->s_dtimeout++;
-			ttime = get_cycles();
-
-			/*
-			 * Our retries may be blocked by all destination
-			 * swack resources being consumed, and a timeout
-			 * pending.  In that case hardware returns the
-			 * ERROR that looks like a destination timeout.
-			 */
-			if (cycles_2_us(ttime - bcp->send_message) <
-							timeout_us) {
-				bcp->conseccompletes = 0;
-				return FLUSH_RETRY_PLUGGED;
-			}
-
-			bcp->conseccompletes = 0;
-			return FLUSH_RETRY_TIMEOUT;
-		} else {
-			/*
-			 * descriptor_status is still BUSY
-			 */
-			cpu_relax();
-		}
-	}
-	bcp->conseccompletes++;
-	return FLUSH_COMPLETE;
-}
-
-static inline cycles_t
-sec_2_cycles(unsigned long sec)
-{
-	unsigned long ns;
-	cycles_t cyc;
-
-	ns = sec * 1000000000;
-	cyc = (ns << CYC2NS_SCALE_FACTOR)/(per_cpu(cyc2ns, smp_processor_id()));
-	return cyc;
-}
-
-/*
- * conditionally add 1 to *v, unless *v is >= u
- * return 0 if we cannot add 1 to *v because it is >= u
- * return 1 if we can add 1 to *v because it is < u
- * the add is atomic
- *
- * This is close to atomic_add_unless(), but this allows the 'u' value
- * to be lowered below the current 'v'.  atomic_add_unless can only stop
- * on equal.
- */
-static inline int atomic_inc_unless_ge(spinlock_t *lock, atomic_t *v, int u)
-{
-	spin_lock(lock);
-	if (atomic_read(v) >= u) {
-		spin_unlock(lock);
-		return 0;
-	}
-	atomic_inc(v);
-	spin_unlock(lock);
-	return 1;
-}
-
-/*
- * Our retries are blocked by all destination swack resources being
- * in use, and a timeout is pending. In that case hardware immediately
- * returns the ERROR that looks like a destination timeout.
- */
-static void
-destination_plugged(struct bau_desc *bau_desc, struct bau_control *bcp,
-			struct bau_control *hmaster, struct ptc_stats *stat)
-{
-	udelay(bcp->plugged_delay);
-	bcp->plugged_tries++;
-	if (bcp->plugged_tries >= bcp->plugsb4reset) {
-		bcp->plugged_tries = 0;
-		quiesce_local_uvhub(hmaster);
-		spin_lock(&hmaster->queue_lock);
-		uv_reset_with_ipi(&bau_desc->distribution, bcp->cpu);
-		spin_unlock(&hmaster->queue_lock);
-		end_uvhub_quiesce(hmaster);
-		bcp->ipi_attempts++;
-		stat->s_resets_plug++;
-	}
-}
-
-static void
-destination_timeout(struct bau_desc *bau_desc, struct bau_control *bcp,
-			struct bau_control *hmaster, struct ptc_stats *stat)
-{
-	hmaster->max_bau_concurrent = 1;
-	bcp->timeout_tries++;
-	if (bcp->timeout_tries >= bcp->timeoutsb4reset) {
-		bcp->timeout_tries = 0;
-		quiesce_local_uvhub(hmaster);
-		spin_lock(&hmaster->queue_lock);
-		uv_reset_with_ipi(&bau_desc->distribution, bcp->cpu);
-		spin_unlock(&hmaster->queue_lock);
-		end_uvhub_quiesce(hmaster);
-		bcp->ipi_attempts++;
-		stat->s_resets_timeout++;
-	}
-}
-
-/*
- * Completions are taking a very long time due to a congested numalink
- * network.
- */
-static void
-disable_for_congestion(struct bau_control *bcp, struct ptc_stats *stat)
-{
-	int tcpu;
-	struct bau_control *tbcp;
-
-	/* let only one cpu do this disabling */
-	spin_lock(&disable_lock);
-	if (!baudisabled && bcp->period_requests &&
-	    ((bcp->period_time / bcp->period_requests) > congested_cycles)) {
-		/* it becomes this cpu's job to turn on the use of the
-		   BAU again */
-		baudisabled = 1;
-		bcp->set_bau_off = 1;
-		bcp->set_bau_on_time = get_cycles() +
-			sec_2_cycles(bcp->congested_period);
-		stat->s_bau_disabled++;
-		for_each_present_cpu(tcpu) {
-			tbcp = &per_cpu(bau_control, tcpu);
-				tbcp->baudisabled = 1;
-		}
-	}
-	spin_unlock(&disable_lock);
-}
-
-/**
- * uv_flush_send_and_wait
- *
- * Send a broadcast and wait for it to complete.
- *
- * The flush_mask contains the cpus the broadcast is to be sent to including
- * cpus that are on the local uvhub.
- *
- * Returns 0 if all flushing represented in the mask was done.
- * Returns 1 if it gives up entirely and the original cpu mask is to be
- * returned to the kernel.
- */
-int uv_flush_send_and_wait(struct bau_desc *bau_desc,
-			   struct cpumask *flush_mask, struct bau_control *bcp)
-{
-	int right_shift;
-	int completion_status = 0;
-	int seq_number = 0;
-	long try = 0;
-	int cpu = bcp->uvhub_cpu;
-	int this_cpu = bcp->cpu;
-	unsigned long mmr_offset;
-	unsigned long index;
-	cycles_t time1;
-	cycles_t time2;
-	cycles_t elapsed;
-	struct ptc_stats *stat = bcp->statp;
-	struct bau_control *smaster = bcp->socket_master;
-	struct bau_control *hmaster = bcp->uvhub_master;
-
-	if (!atomic_inc_unless_ge(&hmaster->uvhub_lock,
-			&hmaster->active_descriptor_count,
-			hmaster->max_bau_concurrent)) {
-		stat->s_throttles++;
-		do {
-			cpu_relax();
-		} while (!atomic_inc_unless_ge(&hmaster->uvhub_lock,
-			&hmaster->active_descriptor_count,
-			hmaster->max_bau_concurrent));
-	}
-	while (hmaster->uvhub_quiesce)
-		cpu_relax();
-
-	if (cpu < UV_CPUS_PER_ACT_STATUS) {
-		mmr_offset = UVH_LB_BAU_SB_ACTIVATION_STATUS_0;
-		right_shift = cpu * UV_ACT_STATUS_SIZE;
-	} else {
-		mmr_offset = UVH_LB_BAU_SB_ACTIVATION_STATUS_1;
-		right_shift =
-		    ((cpu - UV_CPUS_PER_ACT_STATUS) * UV_ACT_STATUS_SIZE);
-	}
-	time1 = get_cycles();
-	do {
-		if (try == 0) {
-			bau_desc->header.msg_type = MSG_REGULAR;
-			seq_number = bcp->message_number++;
-		} else {
-			bau_desc->header.msg_type = MSG_RETRY;
-			stat->s_retry_messages++;
-		}
-		bau_desc->header.sequence = seq_number;
-		index = (1UL << UVH_LB_BAU_SB_ACTIVATION_CONTROL_PUSH_SHFT) |
-			bcp->uvhub_cpu;
-		bcp->send_message = get_cycles();
-		uv_write_local_mmr(UVH_LB_BAU_SB_ACTIVATION_CONTROL, index);
-		try++;
-		completion_status = uv_wait_completion(bau_desc, mmr_offset,
-			right_shift, this_cpu, bcp, smaster, try);
-
-		if (completion_status == FLUSH_RETRY_PLUGGED) {
-			destination_plugged(bau_desc, bcp, hmaster, stat);
-		} else if (completion_status == FLUSH_RETRY_TIMEOUT) {
-			destination_timeout(bau_desc, bcp, hmaster, stat);
-		}
-		if (bcp->ipi_attempts >= bcp->ipi_reset_limit) {
-			bcp->ipi_attempts = 0;
-			completion_status = FLUSH_GIVEUP;
-			break;
-		}
-		cpu_relax();
-	} while ((completion_status == FLUSH_RETRY_PLUGGED) ||
-		 (completion_status == FLUSH_RETRY_TIMEOUT));
-	time2 = get_cycles();
-	bcp->plugged_tries = 0;
-	bcp->timeout_tries = 0;
-	if ((completion_status == FLUSH_COMPLETE) &&
-	    (bcp->conseccompletes > bcp->complete_threshold) &&
-	    (hmaster->max_bau_concurrent <
-					hmaster->max_bau_concurrent_constant))
-			hmaster->max_bau_concurrent++;
-	while (hmaster->uvhub_quiesce)
-		cpu_relax();
-	atomic_dec(&hmaster->active_descriptor_count);
-	if (time2 > time1) {
-		elapsed = time2 - time1;
-		stat->s_time += elapsed;
-		if ((completion_status == FLUSH_COMPLETE) && (try == 1)) {
-			bcp->period_requests++;
-			bcp->period_time += elapsed;
-			if ((elapsed > congested_cycles) &&
-			    (bcp->period_requests > bcp->congested_reps)) {
-				disable_for_congestion(bcp, stat);
-			}
-		}
-	} else
-		stat->s_requestor--;
-	if (completion_status == FLUSH_COMPLETE && try > 1)
-		stat->s_retriesok++;
-	else if (completion_status == FLUSH_GIVEUP) {
-		stat->s_giveup++;
-		return 1;
-	}
-	return 0;
-}
-
-/**
- * uv_flush_tlb_others - globally purge translation cache of a virtual
- * address or all TLB's
- * @cpumask: mask of all cpu's in which the address is to be removed
- * @mm: mm_struct containing virtual address range
- * @va: virtual address to be removed (or TLB_FLUSH_ALL for all TLB's on cpu)
- * @cpu: the current cpu
- *
- * This is the entry point for initiating any UV global TLB shootdown.
- *
- * Purges the translation caches of all specified processors of the given
- * virtual address, or purges all TLB's on specified processors.
- *
- * The caller has derived the cpumask from the mm_struct.  This function
- * is called only if there are bits set in the mask. (e.g. flush_tlb_page())
- *
- * The cpumask is converted into a uvhubmask of the uvhubs containing
- * those cpus.
- *
- * Note that this function should be called with preemption disabled.
- *
- * Returns NULL if all remote flushing was done.
- * Returns pointer to cpumask if some remote flushing remains to be
- * done.  The returned pointer is valid till preemption is re-enabled.
- */
-const struct cpumask *uv_flush_tlb_others(const struct cpumask *cpumask,
-					  struct mm_struct *mm,
-					  unsigned long va, unsigned int cpu)
-{
-	int tcpu;
-	int uvhub;
-	int locals = 0;
-	int remotes = 0;
-	int hubs = 0;
-	struct bau_desc *bau_desc;
-	struct cpumask *flush_mask;
-	struct ptc_stats *stat;
-	struct bau_control *bcp;
-	struct bau_control *tbcp;
-
-	/* kernel was booted 'nobau' */
-	if (nobau)
-		return cpumask;
-
-	bcp = &per_cpu(bau_control, cpu);
-	stat = bcp->statp;
-
-	/* bau was disabled due to slow response */
-	if (bcp->baudisabled) {
-		/* the cpu that disabled it must re-enable it */
-		if (bcp->set_bau_off) {
-			if (get_cycles() >= bcp->set_bau_on_time) {
-				stat->s_bau_reenabled++;
-				baudisabled = 0;
-				for_each_present_cpu(tcpu) {
-					tbcp = &per_cpu(bau_control, tcpu);
-					tbcp->baudisabled = 0;
-					tbcp->period_requests = 0;
-					tbcp->period_time = 0;
-				}
-			}
-		}
-		return cpumask;
-	}
-
-	/*
-	 * Each sending cpu has a per-cpu mask which it fills from the caller's
-	 * cpu mask.  All cpus are converted to uvhubs and copied to the
-	 * activation descriptor.
-	 */
-	flush_mask = (struct cpumask *)per_cpu(uv_flush_tlb_mask, cpu);
-	/* don't actually do a shootdown of the local cpu */
-	cpumask_andnot(flush_mask, cpumask, cpumask_of(cpu));
-	if (cpu_isset(cpu, *cpumask))
-		stat->s_ntargself++;
-
-	bau_desc = bcp->descriptor_base;
-	bau_desc += UV_ITEMS_PER_DESCRIPTOR * bcp->uvhub_cpu;
-	bau_uvhubs_clear(&bau_desc->distribution, UV_DISTRIBUTION_SIZE);
-
-	/* cpu statistics */
-	for_each_cpu(tcpu, flush_mask) {
-		uvhub = uv_cpu_to_blade_id(tcpu);
-		bau_uvhub_set(uvhub, &bau_desc->distribution);
-		if (uvhub == bcp->uvhub)
-			locals++;
-		else
-			remotes++;
-	}
-	if ((locals + remotes) == 0)
-		return NULL;
-	stat->s_requestor++;
-	stat->s_ntargcpu += remotes + locals;
-	stat->s_ntargremotes += remotes;
-	stat->s_ntarglocals += locals;
-	remotes = bau_uvhub_weight(&bau_desc->distribution);
-
-	/* uvhub statistics */
-	hubs = bau_uvhub_weight(&bau_desc->distribution);
-	if (locals) {
-		stat->s_ntarglocaluvhub++;
-		stat->s_ntargremoteuvhub += (hubs - 1);
-	} else
-		stat->s_ntargremoteuvhub += hubs;
-	stat->s_ntarguvhub += hubs;
-	if (hubs >= 16)
-		stat->s_ntarguvhub16++;
-	else if (hubs >= 8)
-		stat->s_ntarguvhub8++;
-	else if (hubs >= 4)
-		stat->s_ntarguvhub4++;
-	else if (hubs >= 2)
-		stat->s_ntarguvhub2++;
-	else
-		stat->s_ntarguvhub1++;
-
-	bau_desc->payload.address = va;
-	bau_desc->payload.sending_cpu = cpu;
-
-	/*
-	 * uv_flush_send_and_wait returns 0 if all cpu's were messaged,
-	 * or 1 if it gave up and the original cpumask should be returned.
-	 */
-	if (!uv_flush_send_and_wait(bau_desc, flush_mask, bcp))
-		return NULL;
-	else
-		return cpumask;
-}
-
-/*
- * The BAU message interrupt comes here. (registered by set_intr_gate)
- * See entry_64.S
- *
- * We received a broadcast assist message.
- *
- * Interrupts are disabled; this interrupt could represent
- * the receipt of several messages.
- *
- * All cores/threads on this hub get this interrupt.
- * The last one to see it does the software ack.
- * (the resource will not be freed until noninterruptable cpus see this
- *  interrupt; hardware may timeout the s/w ack and reply ERROR)
- */
-void uv_bau_message_interrupt(struct pt_regs *regs)
-{
-	int count = 0;
-	cycles_t time_start;
-	struct bau_payload_queue_entry *msg;
-	struct bau_control *bcp;
-	struct ptc_stats *stat;
-	struct msg_desc msgdesc;
-
-	time_start = get_cycles();
-	bcp = &per_cpu(bau_control, smp_processor_id());
-	stat = bcp->statp;
-	msgdesc.va_queue_first = bcp->va_queue_first;
-	msgdesc.va_queue_last = bcp->va_queue_last;
-	msg = bcp->bau_msg_head;
-	while (msg->sw_ack_vector) {
-		count++;
-		msgdesc.msg_slot = msg - msgdesc.va_queue_first;
-		msgdesc.sw_ack_slot = ffs(msg->sw_ack_vector) - 1;
-		msgdesc.msg = msg;
-		uv_bau_process_message(&msgdesc, bcp);
-		msg++;
-		if (msg > msgdesc.va_queue_last)
-			msg = msgdesc.va_queue_first;
-		bcp->bau_msg_head = msg;
-	}
-	stat->d_time += (get_cycles() - time_start);
-	if (!count)
-		stat->d_nomsg++;
-	else if (count > 1)
-		stat->d_multmsg++;
-	ack_APIC_irq();
-}
-
-/*
- * uv_enable_timeouts
- *
- * Each target uvhub (i.e. a uvhub that has no cpu's) needs to have
- * shootdown message timeouts enabled.  The timeout does not cause
- * an interrupt, but causes an error message to be returned to
- * the sender.
- */
-static void uv_enable_timeouts(void)
-{
-	int uvhub;
-	int nuvhubs;
-	int pnode;
-	unsigned long mmr_image;
-
-	nuvhubs = uv_num_possible_blades();
-
-	for (uvhub = 0; uvhub < nuvhubs; uvhub++) {
-		if (!uv_blade_nr_possible_cpus(uvhub))
-			continue;
-
-		pnode = uv_blade_to_pnode(uvhub);
-		mmr_image =
-		    uv_read_global_mmr64(pnode, UVH_LB_BAU_MISC_CONTROL);
-		/*
-		 * Set the timeout period and then lock it in, in three
-		 * steps; captures and locks in the period.
-		 *
-		 * To program the period, the SOFT_ACK_MODE must be off.
-		 */
-		mmr_image &= ~((unsigned long)1 <<
-		    UVH_LB_BAU_MISC_CONTROL_ENABLE_INTD_SOFT_ACK_MODE_SHFT);
-		uv_write_global_mmr64
-		    (pnode, UVH_LB_BAU_MISC_CONTROL, mmr_image);
-		/*
-		 * Set the 4-bit period.
-		 */
-		mmr_image &= ~((unsigned long)0xf <<
-		     UVH_LB_BAU_MISC_CONTROL_INTD_SOFT_ACK_TIMEOUT_PERIOD_SHFT);
-		mmr_image |= (UV_INTD_SOFT_ACK_TIMEOUT_PERIOD <<
-		     UVH_LB_BAU_MISC_CONTROL_INTD_SOFT_ACK_TIMEOUT_PERIOD_SHFT);
-		uv_write_global_mmr64
-		    (pnode, UVH_LB_BAU_MISC_CONTROL, mmr_image);
-		/*
-		 * Subsequent reversals of the timebase bit (3) cause an
-		 * immediate timeout of one or all INTD resources as
-		 * indicated in bits 2:0 (7 causes all of them to timeout).
-		 */
-		mmr_image |= ((unsigned long)1 <<
-		    UVH_LB_BAU_MISC_CONTROL_ENABLE_INTD_SOFT_ACK_MODE_SHFT);
-		uv_write_global_mmr64
-		    (pnode, UVH_LB_BAU_MISC_CONTROL, mmr_image);
-	}
-}
-
-static void *uv_ptc_seq_start(struct seq_file *file, loff_t *offset)
-{
-	if (*offset < num_possible_cpus())
-		return offset;
-	return NULL;
-}
-
-static void *uv_ptc_seq_next(struct seq_file *file, void *data, loff_t *offset)
-{
-	(*offset)++;
-	if (*offset < num_possible_cpus())
-		return offset;
-	return NULL;
-}
-
-static void uv_ptc_seq_stop(struct seq_file *file, void *data)
-{
-}
-
-static inline unsigned long long
-microsec_2_cycles(unsigned long microsec)
-{
-	unsigned long ns;
-	unsigned long long cyc;
-
-	ns = microsec * 1000;
-	cyc = (ns << CYC2NS_SCALE_FACTOR)/(per_cpu(cyc2ns, smp_processor_id()));
-	return cyc;
-}
-
-/*
- * Display the statistics thru /proc.
- * 'data' points to the cpu number
- */
-static int uv_ptc_seq_show(struct seq_file *file, void *data)
-{
-	struct ptc_stats *stat;
-	int cpu;
-
-	cpu = *(loff_t *)data;
-
-	if (!cpu) {
-		seq_printf(file,
-			"# cpu sent stime self locals remotes ncpus localhub ");
-		seq_printf(file,
-			"remotehub numuvhubs numuvhubs16 numuvhubs8 ");
-		seq_printf(file,
-			"numuvhubs4 numuvhubs2 numuvhubs1 dto ");
-		seq_printf(file,
-			"retries rok resetp resett giveup sto bz throt ");
-		seq_printf(file,
-			"sw_ack recv rtime all ");
-		seq_printf(file,
-			"one mult none retry canc nocan reset rcan ");
-		seq_printf(file,
-			"disable enable\n");
-	}
-	if (cpu < num_possible_cpus() && cpu_online(cpu)) {
-		stat = &per_cpu(ptcstats, cpu);
-		/* source side statistics */
-		seq_printf(file,
-			"cpu %d %ld %ld %ld %ld %ld %ld %ld %ld %ld %ld ",
-			   cpu, stat->s_requestor, cycles_2_us(stat->s_time),
-			   stat->s_ntargself, stat->s_ntarglocals,
-			   stat->s_ntargremotes, stat->s_ntargcpu,
-			   stat->s_ntarglocaluvhub, stat->s_ntargremoteuvhub,
-			   stat->s_ntarguvhub, stat->s_ntarguvhub16);
-		seq_printf(file, "%ld %ld %ld %ld %ld ",
-			   stat->s_ntarguvhub8, stat->s_ntarguvhub4,
-			   stat->s_ntarguvhub2, stat->s_ntarguvhub1,
-			   stat->s_dtimeout);
-		seq_printf(file, "%ld %ld %ld %ld %ld %ld %ld %ld ",
-			   stat->s_retry_messages, stat->s_retriesok,
-			   stat->s_resets_plug, stat->s_resets_timeout,
-			   stat->s_giveup, stat->s_stimeout,
-			   stat->s_busy, stat->s_throttles);
-
-		/* destination side statistics */
-		seq_printf(file,
-			   "%lx %ld %ld %ld %ld %ld %ld %ld %ld %ld %ld %ld ",
-			   uv_read_global_mmr64(uv_cpu_to_pnode(cpu),
-					UVH_LB_BAU_INTD_SOFTWARE_ACKNOWLEDGE),
-			   stat->d_requestee, cycles_2_us(stat->d_time),
-			   stat->d_alltlb, stat->d_onetlb, stat->d_multmsg,
-			   stat->d_nomsg, stat->d_retries, stat->d_canceled,
-			   stat->d_nocanceled, stat->d_resets,
-			   stat->d_rcanceled);
-		seq_printf(file, "%ld %ld\n",
-			stat->s_bau_disabled, stat->s_bau_reenabled);
-	}
-
-	return 0;
-}
-
-/*
- * Display the tunables thru debugfs
- */
-static ssize_t tunables_read(struct file *file, char __user *userbuf,
-						size_t count, loff_t *ppos)
-{
-	char *buf;
-	int ret;
-
-	buf = kasprintf(GFP_KERNEL, "%s %s %s\n%d %d %d %d %d %d %d %d %d\n",
-		"max_bau_concurrent plugged_delay plugsb4reset",
-		"timeoutsb4reset ipi_reset_limit complete_threshold",
-		"congested_response_us congested_reps congested_period",
-		max_bau_concurrent, plugged_delay, plugsb4reset,
-		timeoutsb4reset, ipi_reset_limit, complete_threshold,
-		congested_response_us, congested_reps, congested_period);
-
-	if (!buf)
-		return -ENOMEM;
-
-	ret = simple_read_from_buffer(userbuf, count, ppos, buf, strlen(buf));
-	kfree(buf);
-	return ret;
-}
-
-/*
- * -1: resetf the statistics
- *  0: display meaning of the statistics
- */
-static ssize_t uv_ptc_proc_write(struct file *file, const char __user *user,
-				 size_t count, loff_t *data)
-{
-	int cpu;
-	long input_arg;
-	char optstr[64];
-	struct ptc_stats *stat;
-
-	if (count == 0 || count > sizeof(optstr))
-		return -EINVAL;
-	if (copy_from_user(optstr, user, count))
-		return -EFAULT;
-	optstr[count - 1] = '\0';
-	if (strict_strtol(optstr, 10, &input_arg) < 0) {
-		printk(KERN_DEBUG "%s is invalid\n", optstr);
-		return -EINVAL;
-	}
-
-	if (input_arg == 0) {
-		printk(KERN_DEBUG "# cpu:      cpu number\n");
-		printk(KERN_DEBUG "Sender statistics:\n");
-		printk(KERN_DEBUG
-		"sent:     number of shootdown messages sent\n");
-		printk(KERN_DEBUG
-		"stime:    time spent sending messages\n");
-		printk(KERN_DEBUG
-		"numuvhubs: number of hubs targeted with shootdown\n");
-		printk(KERN_DEBUG
-		"numuvhubs16: number times 16 or more hubs targeted\n");
-		printk(KERN_DEBUG
-		"numuvhubs8: number times 8 or more hubs targeted\n");
-		printk(KERN_DEBUG
-		"numuvhubs4: number times 4 or more hubs targeted\n");
-		printk(KERN_DEBUG
-		"numuvhubs2: number times 2 or more hubs targeted\n");
-		printk(KERN_DEBUG
-		"numuvhubs1: number times 1 hub targeted\n");
-		printk(KERN_DEBUG
-		"numcpus:  number of cpus targeted with shootdown\n");
-		printk(KERN_DEBUG
-		"dto:      number of destination timeouts\n");
-		printk(KERN_DEBUG
-		"retries:  destination timeout retries sent\n");
-		printk(KERN_DEBUG
-		"rok:   :  destination timeouts successfully retried\n");
-		printk(KERN_DEBUG
-		"resetp:   ipi-style resource resets for plugs\n");
-		printk(KERN_DEBUG
-		"resett:   ipi-style resource resets for timeouts\n");
-		printk(KERN_DEBUG
-		"giveup:   fall-backs to ipi-style shootdowns\n");
-		printk(KERN_DEBUG
-		"sto:      number of source timeouts\n");
-		printk(KERN_DEBUG
-		"bz:       number of stay-busy's\n");
-		printk(KERN_DEBUG
-		"throt:    number times spun in throttle\n");
-		printk(KERN_DEBUG "Destination side statistics:\n");
-		printk(KERN_DEBUG
-		"sw_ack:   image of UVH_LB_BAU_INTD_SOFTWARE_ACKNOWLEDGE\n");
-		printk(KERN_DEBUG
-		"recv:     shootdown messages received\n");
-		printk(KERN_DEBUG
-		"rtime:    time spent processing messages\n");
-		printk(KERN_DEBUG
-		"all:      shootdown all-tlb messages\n");
-		printk(KERN_DEBUG
-		"one:      shootdown one-tlb messages\n");
-		printk(KERN_DEBUG
-		"mult:     interrupts that found multiple messages\n");
-		printk(KERN_DEBUG
-		"none:     interrupts that found no messages\n");
-		printk(KERN_DEBUG
-		"retry:    number of retry messages processed\n");
-		printk(KERN_DEBUG
-		"canc:     number messages canceled by retries\n");
-		printk(KERN_DEBUG
-		"nocan:    number retries that found nothing to cancel\n");
-		printk(KERN_DEBUG
-		"reset:    number of ipi-style reset requests processed\n");
-		printk(KERN_DEBUG
-		"rcan:     number messages canceled by reset requests\n");
-		printk(KERN_DEBUG
-		"disable:  number times use of the BAU was disabled\n");
-		printk(KERN_DEBUG
-		"enable:   number times use of the BAU was re-enabled\n");
-	} else if (input_arg == -1) {
-		for_each_present_cpu(cpu) {
-			stat = &per_cpu(ptcstats, cpu);
-			memset(stat, 0, sizeof(struct ptc_stats));
-		}
-	}
-
-	return count;
-}
-
-static int local_atoi(const char *name)
-{
-	int val = 0;
-
-	for (;; name++) {
-		switch (*name) {
-		case '0' ... '9':
-			val = 10*val+(*name-'0');
-			break;
-		default:
-			return val;
-		}
-	}
-}
-
-/*
- * set the tunables
- * 0 values reset them to defaults
- */
-static ssize_t tunables_write(struct file *file, const char __user *user,
-				 size_t count, loff_t *data)
-{
-	int cpu;
-	int cnt = 0;
-	int val;
-	char *p;
-	char *q;
-	char instr[64];
-	struct bau_control *bcp;
-
-	if (count == 0 || count > sizeof(instr)-1)
-		return -EINVAL;
-	if (copy_from_user(instr, user, count))
-		return -EFAULT;
-
-	instr[count] = '\0';
-	/* count the fields */
-	p = instr + strspn(instr, WHITESPACE);
-	q = p;
-	for (; *p; p = q + strspn(q, WHITESPACE)) {
-		q = p + strcspn(p, WHITESPACE);
-		cnt++;
-		if (q == p)
-			break;
-	}
-	if (cnt != 9) {
-		printk(KERN_INFO "bau tunable error: should be 9 numbers\n");
-		return -EINVAL;
-	}
-
-	p = instr + strspn(instr, WHITESPACE);
-	q = p;
-	for (cnt = 0; *p; p = q + strspn(q, WHITESPACE), cnt++) {
-		q = p + strcspn(p, WHITESPACE);
-		val = local_atoi(p);
-		switch (cnt) {
-		case 0:
-			if (val == 0) {
-				max_bau_concurrent = MAX_BAU_CONCURRENT;
-				max_bau_concurrent_constant =
-							MAX_BAU_CONCURRENT;
-				continue;
-			}
-			bcp = &per_cpu(bau_control, smp_processor_id());
-			if (val < 1 || val > bcp->cpus_in_uvhub) {
-				printk(KERN_DEBUG
-				"Error: BAU max concurrent %d is invalid\n",
-				val);
-				return -EINVAL;
-			}
-			max_bau_concurrent = val;
-			max_bau_concurrent_constant = val;
-			continue;
-		case 1:
-			if (val == 0)
-				plugged_delay = PLUGGED_DELAY;
-			else
-				plugged_delay = val;
-			continue;
-		case 2:
-			if (val == 0)
-				plugsb4reset = PLUGSB4RESET;
-			else
-				plugsb4reset = val;
-			continue;
-		case 3:
-			if (val == 0)
-				timeoutsb4reset = TIMEOUTSB4RESET;
-			else
-				timeoutsb4reset = val;
-			continue;
-		case 4:
-			if (val == 0)
-				ipi_reset_limit = IPI_RESET_LIMIT;
-			else
-				ipi_reset_limit = val;
-			continue;
-		case 5:
-			if (val == 0)
-				complete_threshold = COMPLETE_THRESHOLD;
-			else
-				complete_threshold = val;
-			continue;
-		case 6:
-			if (val == 0)
-				congested_response_us = CONGESTED_RESPONSE_US;
-			else
-				congested_response_us = val;
-			continue;
-		case 7:
-			if (val == 0)
-				congested_reps = CONGESTED_REPS;
-			else
-				congested_reps = val;
-			continue;
-		case 8:
-			if (val == 0)
-				congested_period = CONGESTED_PERIOD;
-			else
-				congested_period = val;
-			continue;
-		}
-		if (q == p)
-			break;
-	}
-	for_each_present_cpu(cpu) {
-		bcp = &per_cpu(bau_control, cpu);
-		bcp->max_bau_concurrent = max_bau_concurrent;
-		bcp->max_bau_concurrent_constant = max_bau_concurrent;
-		bcp->plugged_delay = plugged_delay;
-		bcp->plugsb4reset = plugsb4reset;
-		bcp->timeoutsb4reset = timeoutsb4reset;
-		bcp->ipi_reset_limit = ipi_reset_limit;
-		bcp->complete_threshold = complete_threshold;
-		bcp->congested_response_us = congested_response_us;
-		bcp->congested_reps = congested_reps;
-		bcp->congested_period = congested_period;
-	}
-	return count;
-}
-
-static const struct seq_operations uv_ptc_seq_ops = {
-	.start		= uv_ptc_seq_start,
-	.next		= uv_ptc_seq_next,
-	.stop		= uv_ptc_seq_stop,
-	.show		= uv_ptc_seq_show
-};
-
-static int uv_ptc_proc_open(struct inode *inode, struct file *file)
-{
-	return seq_open(file, &uv_ptc_seq_ops);
-}
-
-static int tunables_open(struct inode *inode, struct file *file)
-{
-	return 0;
-}
-
-static const struct file_operations proc_uv_ptc_operations = {
-	.open		= uv_ptc_proc_open,
-	.read		= seq_read,
-	.write		= uv_ptc_proc_write,
-	.llseek		= seq_lseek,
-	.release	= seq_release,
-};
-
-static const struct file_operations tunables_fops = {
-	.open		= tunables_open,
-	.read		= tunables_read,
-	.write		= tunables_write,
-	.llseek		= default_llseek,
-};
-
-static int __init uv_ptc_init(void)
-{
-	struct proc_dir_entry *proc_uv_ptc;
-
-	if (!is_uv_system())
-		return 0;
-
-	proc_uv_ptc = proc_create(UV_PTC_BASENAME, 0444, NULL,
-				  &proc_uv_ptc_operations);
-	if (!proc_uv_ptc) {
-		printk(KERN_ERR "unable to create %s proc entry\n",
-		       UV_PTC_BASENAME);
-		return -EINVAL;
-	}
-
-	tunables_dir = debugfs_create_dir(UV_BAU_TUNABLES_DIR, NULL);
-	if (!tunables_dir) {
-		printk(KERN_ERR "unable to create debugfs directory %s\n",
-		       UV_BAU_TUNABLES_DIR);
-		return -EINVAL;
-	}
-	tunables_file = debugfs_create_file(UV_BAU_TUNABLES_FILE, 0600,
-			tunables_dir, NULL, &tunables_fops);
-	if (!tunables_file) {
-		printk(KERN_ERR "unable to create debugfs file %s\n",
-		       UV_BAU_TUNABLES_FILE);
-		return -EINVAL;
-	}
-	return 0;
-}
-
-/*
- * initialize the sending side's sending buffers
- */
-static void
-uv_activation_descriptor_init(int node, int pnode)
-{
-	int i;
-	int cpu;
-	unsigned long pa;
-	unsigned long m;
-	unsigned long n;
-	struct bau_desc *bau_desc;
-	struct bau_desc *bd2;
-	struct bau_control *bcp;
-
-	/*
-	 * each bau_desc is 64 bytes; there are 8 (UV_ITEMS_PER_DESCRIPTOR)
-	 * per cpu; and up to 32 (UV_ADP_SIZE) cpu's per uvhub
-	 */
-	bau_desc = (struct bau_desc *)kmalloc_node(sizeof(struct bau_desc)*
-		UV_ADP_SIZE*UV_ITEMS_PER_DESCRIPTOR, GFP_KERNEL, node);
-	BUG_ON(!bau_desc);
-
-	pa = uv_gpa(bau_desc); /* need the real nasid*/
-	n = pa >> uv_nshift;
-	m = pa & uv_mmask;
-
-	uv_write_global_mmr64(pnode, UVH_LB_BAU_SB_DESCRIPTOR_BASE,
-			      (n << UV_DESC_BASE_PNODE_SHIFT | m));
-
-	/*
-	 * initializing all 8 (UV_ITEMS_PER_DESCRIPTOR) descriptors for each
-	 * cpu even though we only use the first one; one descriptor can
-	 * describe a broadcast to 256 uv hubs.
-	 */
-	for (i = 0, bd2 = bau_desc; i < (UV_ADP_SIZE*UV_ITEMS_PER_DESCRIPTOR);
-		i++, bd2++) {
-		memset(bd2, 0, sizeof(struct bau_desc));
-		bd2->header.sw_ack_flag = 1;
-		/*
-		 * base_dest_nodeid is the nasid (pnode<<1) of the first uvhub
-		 * in the partition. The bit map will indicate uvhub numbers,
-		 * which are 0-N in a partition. Pnodes are unique system-wide.
-		 */
-		bd2->header.base_dest_nodeid = uv_partition_base_pnode << 1;
-		bd2->header.dest_subnodeid = 0x10; /* the LB */
-		bd2->header.command = UV_NET_ENDPOINT_INTD;
-		bd2->header.int_both = 1;
-		/*
-		 * all others need to be set to zero:
-		 *   fairness chaining multilevel count replied_to
-		 */
-	}
-	for_each_present_cpu(cpu) {
-		if (pnode != uv_blade_to_pnode(uv_cpu_to_blade_id(cpu)))
-			continue;
-		bcp = &per_cpu(bau_control, cpu);
-		bcp->descriptor_base = bau_desc;
-	}
-}
-
-/*
- * initialize the destination side's receiving buffers
- * entered for each uvhub in the partition
- * - node is first node (kernel memory notion) on the uvhub
- * - pnode is the uvhub's physical identifier
- */
-static void
-uv_payload_queue_init(int node, int pnode)
-{
-	int pn;
-	int cpu;
-	char *cp;
-	unsigned long pa;
-	struct bau_payload_queue_entry *pqp;
-	struct bau_payload_queue_entry *pqp_malloc;
-	struct bau_control *bcp;
-
-	pqp = (struct bau_payload_queue_entry *) kmalloc_node(
-		(DEST_Q_SIZE + 1) * sizeof(struct bau_payload_queue_entry),
-		GFP_KERNEL, node);
-	BUG_ON(!pqp);
-	pqp_malloc = pqp;
-
-	cp = (char *)pqp + 31;
-	pqp = (struct bau_payload_queue_entry *)(((unsigned long)cp >> 5) << 5);
-
-	for_each_present_cpu(cpu) {
-		if (pnode != uv_cpu_to_pnode(cpu))
-			continue;
-		/* for every cpu on this pnode: */
-		bcp = &per_cpu(bau_control, cpu);
-		bcp->va_queue_first = pqp;
-		bcp->bau_msg_head = pqp;
-		bcp->va_queue_last = pqp + (DEST_Q_SIZE - 1);
-	}
-	/*
-	 * need the pnode of where the memory was really allocated
-	 */
-	pa = uv_gpa(pqp);
-	pn = pa >> uv_nshift;
-	uv_write_global_mmr64(pnode,
-			      UVH_LB_BAU_INTD_PAYLOAD_QUEUE_FIRST,
-			      ((unsigned long)pn << UV_PAYLOADQ_PNODE_SHIFT) |
-			      uv_physnodeaddr(pqp));
-	uv_write_global_mmr64(pnode, UVH_LB_BAU_INTD_PAYLOAD_QUEUE_TAIL,
-			      uv_physnodeaddr(pqp));
-	uv_write_global_mmr64(pnode, UVH_LB_BAU_INTD_PAYLOAD_QUEUE_LAST,
-			      (unsigned long)
-			      uv_physnodeaddr(pqp + (DEST_Q_SIZE - 1)));
-	/* in effect, all msg_type's are set to MSG_NOOP */
-	memset(pqp, 0, sizeof(struct bau_payload_queue_entry) * DEST_Q_SIZE);
-}
-
-/*
- * Initialization of each UV hub's structures
- */
-static void __init uv_init_uvhub(int uvhub, int vector)
-{
-	int node;
-	int pnode;
-	unsigned long apicid;
-
-	node = uvhub_to_first_node(uvhub);
-	pnode = uv_blade_to_pnode(uvhub);
-	uv_activation_descriptor_init(node, pnode);
-	uv_payload_queue_init(node, pnode);
-	/*
-	 * the below initialization can't be in firmware because the
-	 * messaging IRQ will be determined by the OS
-	 */
-	apicid = uvhub_to_first_apicid(uvhub);
-	uv_write_global_mmr64(pnode, UVH_BAU_DATA_CONFIG,
-				      ((apicid << 32) | vector));
-}
-
-/*
- * We will set BAU_MISC_CONTROL with a timeout period.
- * But the BIOS has set UVH_AGING_PRESCALE_SEL and UVH_TRANSACTION_TIMEOUT.
- * So the destination timeout period has be be calculated from them.
- */
-static int
-calculate_destination_timeout(void)
-{
-	unsigned long mmr_image;
-	int mult1;
-	int mult2;
-	int index;
-	int base;
-	int ret;
-	unsigned long ts_ns;
-
-	mult1 = UV_INTD_SOFT_ACK_TIMEOUT_PERIOD & BAU_MISC_CONTROL_MULT_MASK;
-	mmr_image = uv_read_local_mmr(UVH_AGING_PRESCALE_SEL);
-	index = (mmr_image >> BAU_URGENCY_7_SHIFT) & BAU_URGENCY_7_MASK;
-	mmr_image = uv_read_local_mmr(UVH_TRANSACTION_TIMEOUT);
-	mult2 = (mmr_image >> BAU_TRANS_SHIFT) & BAU_TRANS_MASK;
-	base = timeout_base_ns[index];
-	ts_ns = base * mult1 * mult2;
-	ret = ts_ns / 1000;
-	return ret;
-}
-
-/*
- * initialize the bau_control structure for each cpu
- */
-static void __init uv_init_per_cpu(int nuvhubs)
-{
-	int i;
-	int cpu;
-	int pnode;
-	int uvhub;
-	int have_hmaster;
-	short socket = 0;
-	unsigned short socket_mask;
-	unsigned char *uvhub_mask;
-	struct bau_control *bcp;
-	struct uvhub_desc *bdp;
-	struct socket_desc *sdp;
-	struct bau_control *hmaster = NULL;
-	struct bau_control *smaster = NULL;
-	struct socket_desc {
-		short num_cpus;
-		short cpu_number[16];
-	};
-	struct uvhub_desc {
-		unsigned short socket_mask;
-		short num_cpus;
-		short uvhub;
-		short pnode;
-		struct socket_desc socket[2];
-	};
-	struct uvhub_desc *uvhub_descs;
-
-	timeout_us = calculate_destination_timeout();
-
-	uvhub_descs = (struct uvhub_desc *)
-		kmalloc(nuvhubs * sizeof(struct uvhub_desc), GFP_KERNEL);
-	memset(uvhub_descs, 0, nuvhubs * sizeof(struct uvhub_desc));
-	uvhub_mask = kzalloc((nuvhubs+7)/8, GFP_KERNEL);
-	for_each_present_cpu(cpu) {
-		bcp = &per_cpu(bau_control, cpu);
-		memset(bcp, 0, sizeof(struct bau_control));
-		pnode = uv_cpu_hub_info(cpu)->pnode;
-		uvhub = uv_cpu_hub_info(cpu)->numa_blade_id;
-		*(uvhub_mask + (uvhub/8)) |= (1 << (uvhub%8));
-		bdp = &uvhub_descs[uvhub];
-		bdp->num_cpus++;
-		bdp->uvhub = uvhub;
-		bdp->pnode = pnode;
-		/* kludge: 'assuming' one node per socket, and assuming that
-		   disabling a socket just leaves a gap in node numbers */
-		socket = (cpu_to_node(cpu) & 1);
-		bdp->socket_mask |= (1 << socket);
-		sdp = &bdp->socket[socket];
-		sdp->cpu_number[sdp->num_cpus] = cpu;
-		sdp->num_cpus++;
-	}
-	for (uvhub = 0; uvhub < nuvhubs; uvhub++) {
-		if (!(*(uvhub_mask + (uvhub/8)) & (1 << (uvhub%8))))
-			continue;
-		have_hmaster = 0;
-		bdp = &uvhub_descs[uvhub];
-		socket_mask = bdp->socket_mask;
-		socket = 0;
-		while (socket_mask) {
-			if (!(socket_mask & 1))
-				goto nextsocket;
-			sdp = &bdp->socket[socket];
-			for (i = 0; i < sdp->num_cpus; i++) {
-				cpu = sdp->cpu_number[i];
-				bcp = &per_cpu(bau_control, cpu);
-				bcp->cpu = cpu;
-				if (i == 0) {
-					smaster = bcp;
-					if (!have_hmaster) {
-						have_hmaster++;
-						hmaster = bcp;
-					}
-				}
-				bcp->cpus_in_uvhub = bdp->num_cpus;
-				bcp->cpus_in_socket = sdp->num_cpus;
-				bcp->socket_master = smaster;
-				bcp->uvhub = bdp->uvhub;
-				bcp->uvhub_master = hmaster;
-				bcp->uvhub_cpu = uv_cpu_hub_info(cpu)->
-						blade_processor_id;
-			}
-nextsocket:
-			socket++;
-			socket_mask = (socket_mask >> 1);
-		}
-	}
-	kfree(uvhub_descs);
-	kfree(uvhub_mask);
-	for_each_present_cpu(cpu) {
-		bcp = &per_cpu(bau_control, cpu);
-		bcp->baudisabled = 0;
-		bcp->statp = &per_cpu(ptcstats, cpu);
-		/* time interval to catch a hardware stay-busy bug */
-		bcp->timeout_interval = microsec_2_cycles(2*timeout_us);
-		bcp->max_bau_concurrent = max_bau_concurrent;
-		bcp->max_bau_concurrent_constant = max_bau_concurrent;
-		bcp->plugged_delay = plugged_delay;
-		bcp->plugsb4reset = plugsb4reset;
-		bcp->timeoutsb4reset = timeoutsb4reset;
-		bcp->ipi_reset_limit = ipi_reset_limit;
-		bcp->complete_threshold = complete_threshold;
-		bcp->congested_response_us = congested_response_us;
-		bcp->congested_reps = congested_reps;
-		bcp->congested_period = congested_period;
-	}
-}
-
-/*
- * Initialization of BAU-related structures
- */
-static int __init uv_bau_init(void)
-{
-	int uvhub;
-	int pnode;
-	int nuvhubs;
-	int cur_cpu;
-	int vector;
-	unsigned long mmr;
-
-	if (!is_uv_system())
-		return 0;
-
-	if (nobau)
-		return 0;
-
-	for_each_possible_cpu(cur_cpu)
-		zalloc_cpumask_var_node(&per_cpu(uv_flush_tlb_mask, cur_cpu),
-				       GFP_KERNEL, cpu_to_node(cur_cpu));
-
-	uv_nshift = uv_hub_info->m_val;
-	uv_mmask = (1UL << uv_hub_info->m_val) - 1;
-	nuvhubs = uv_num_possible_blades();
-	spin_lock_init(&disable_lock);
-	congested_cycles = microsec_2_cycles(congested_response_us);
-
-	uv_init_per_cpu(nuvhubs);
-
-	uv_partition_base_pnode = 0x7fffffff;
-	for (uvhub = 0; uvhub < nuvhubs; uvhub++)
-		if (uv_blade_nr_possible_cpus(uvhub) &&
-			(uv_blade_to_pnode(uvhub) < uv_partition_base_pnode))
-			uv_partition_base_pnode = uv_blade_to_pnode(uvhub);
-
-	vector = UV_BAU_MESSAGE;
-	for_each_possible_blade(uvhub)
-		if (uv_blade_nr_possible_cpus(uvhub))
-			uv_init_uvhub(uvhub, vector);
-
-	uv_enable_timeouts();
-	alloc_intr_gate(vector, uv_bau_message_intr1);
-
-	for_each_possible_blade(uvhub) {
-		if (uv_blade_nr_possible_cpus(uvhub)) {
-			pnode = uv_blade_to_pnode(uvhub);
-			/* INIT the bau */
-			uv_write_global_mmr64(pnode,
-					UVH_LB_BAU_SB_ACTIVATION_CONTROL,
-					((unsigned long)1 << 63));
-			mmr = 1; /* should be 1 to broadcast to both sockets */
-			uv_write_global_mmr64(pnode, UVH_BAU_DATA_BROADCAST,
-						mmr);
-		}
-	}
-
-	return 0;
-}
-core_initcall(uv_bau_init);
-fs_initcall(uv_ptc_init);