Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6 into for-rmk

1 files changed, 792 insertions, 0 deletions

diff --git a/arch/x86/kernel/tlb_uv.c b/arch/x86/kernel/tlb_uv.c
new file mode 100644
index 00000000000..d0fbb7712ab
--- /dev/null
+++ b/arch/x86/kernel/tlb_uv.c
@@ -0,0 +1,792 @@
+/*
+ *	SGI UltraViolet TLB flush routines.
+ *
+ *	(c) 2008 Cliff Wickman <cpw@sgi.com>, SGI.
+ *
+ *	This code is released under the GNU General Public License version 2 or
+ *	later.
+ */
+#include <linux/mc146818rtc.h>
+#include <linux/proc_fs.h>
+#include <linux/kernel.h>
+
+#include <asm/mmu_context.h>
+#include <asm/uv/uv_mmrs.h>
+#include <asm/uv/uv_hub.h>
+#include <asm/uv/uv_bau.h>
+#include <asm/genapic.h>
+#include <asm/idle.h>
+#include <asm/tsc.h>
+
+#include <mach_apic.h>
+
+static struct bau_control	**uv_bau_table_bases __read_mostly;
+static int			uv_bau_retry_limit __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);
+
+/*
+ * 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 void uv_reply_to_message(int resource,
+				struct bau_payload_queue_entry *msg,
+				struct bau_msg_status *msp)
+{
+	unsigned long dw;
+
+	dw = (1 << (resource + UV_SW_ACK_NPENDING)) | (1 << resource);
+	msg->replied_to = 1;
+	msg->sw_ack_vector = 0;
+	if (msp)
+		msp->seen_by.bits = 0;
+	uv_write_local_mmr(UVH_LB_BAU_INTD_SOFTWARE_ACKNOWLEDGE_ALIAS, dw);
+}
+
+/*
+ * 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 bau_payload_queue_entry *msg,
+				   int msg_slot, int sw_ack_slot)
+{
+	unsigned long this_cpu_mask;
+	struct bau_msg_status *msp;
+	int cpu;
+
+	msp = __get_cpu_var(bau_control).msg_statuses + msg_slot;
+	cpu = uv_blade_processor_id();
+	msg->number_of_cpus =
+	    uv_blade_nr_online_cpus(uv_node_to_blade_id(numa_node_id()));
+	this_cpu_mask = 1UL << cpu;
+	if (msp->seen_by.bits & this_cpu_mask)
+		return;
+	atomic_or_long(&msp->seen_by.bits, this_cpu_mask);
+
+	if (msg->replied_to == 1)
+		return;
+
+	if (msg->address == TLB_FLUSH_ALL) {
+		local_flush_tlb();
+		__get_cpu_var(ptcstats).alltlb++;
+	} else {
+		__flush_tlb_one(msg->address);
+		__get_cpu_var(ptcstats).onetlb++;
+	}
+
+	__get_cpu_var(ptcstats).requestee++;
+
+	atomic_inc_short(&msg->acknowledge_count);
+	if (msg->number_of_cpus == msg->acknowledge_count)
+		uv_reply_to_message(sw_ack_slot, msg, msp);
+}
+
+/*
+ * Examine the payload queue on one distribution node to see
+ * which messages have not been seen, and which cpu(s) have not seen them.
+ *
+ * Returns the number of cpu's that have not responded.
+ */
+static int uv_examine_destination(struct bau_control *bau_tablesp, int sender)
+{
+	struct bau_payload_queue_entry *msg;
+	struct bau_msg_status *msp;
+	int count = 0;
+	int i;
+	int j;
+
+	for (msg = bau_tablesp->va_queue_first, i = 0; i < DEST_Q_SIZE;
+	     msg++, i++) {
+		if ((msg->sending_cpu == sender) && (!msg->replied_to)) {
+			msp = bau_tablesp->msg_statuses + i;
+			printk(KERN_DEBUG
+			       "blade %d: address:%#lx %d of %d, not cpu(s): ",
+			       i, msg->address, msg->acknowledge_count,
+			       msg->number_of_cpus);
+			for (j = 0; j < msg->number_of_cpus; j++) {
+				if (!((1L << j) & msp->seen_by.bits)) {
+					count++;
+					printk("%d ", j);
+				}
+			}
+			printk("\n");
+		}
+	}
+	return count;
+}
+
+/*
+ * Examine the payload queue on all the distribution nodes to see
+ * which messages have not been seen, and which cpu(s) have not seen them.
+ *
+ * Returns the number of cpu's that have not responded.
+ */
+static int uv_examine_destinations(struct bau_target_nodemask *distribution)
+{
+	int sender;
+	int i;
+	int count = 0;
+
+	sender = smp_processor_id();
+	for (i = 0; i < sizeof(struct bau_target_nodemask) * BITSPERBYTE; i++) {
+		if (!bau_node_isset(i, distribution))
+			continue;
+		count += uv_examine_destination(uv_bau_table_bases[i], sender);
+	}
+	return count;
+}
+
+/*
+ * wait for completion of a broadcast message
+ *
+ * return COMPLETE, RETRY or GIVEUP
+ */
+static int uv_wait_completion(struct bau_desc *bau_desc,
+			      unsigned long mmr_offset, int right_shift)
+{
+	int exams = 0;
+	long destination_timeouts = 0;
+	long source_timeouts = 0;
+	unsigned long descriptor_status;
+
+	while ((descriptor_status = (((unsigned long)
+		uv_read_local_mmr(mmr_offset) >>
+			right_shift) & UV_ACT_STATUS_MASK)) !=
+			DESC_STATUS_IDLE) {
+		if (descriptor_status == DESC_STATUS_SOURCE_TIMEOUT) {
+			source_timeouts++;
+			if (source_timeouts > SOURCE_TIMEOUT_LIMIT)
+				source_timeouts = 0;
+			__get_cpu_var(ptcstats).s_retry++;
+			return FLUSH_RETRY;
+		}
+		/*
+		 * spin here looking for progress at the destinations
+		 */
+		if (descriptor_status == DESC_STATUS_DESTINATION_TIMEOUT) {
+			destination_timeouts++;
+			if (destination_timeouts > DESTINATION_TIMEOUT_LIMIT) {
+				/*
+				 * returns number of cpus not responding
+				 */
+				if (uv_examine_destinations
+				    (&bau_desc->distribution) == 0) {
+					__get_cpu_var(ptcstats).d_retry++;
+					return FLUSH_RETRY;
+				}
+				exams++;
+				if (exams >= uv_bau_retry_limit) {
+					printk(KERN_DEBUG
+					       "uv_flush_tlb_others");
+					printk("giving up on cpu %d\n",
+					       smp_processor_id());
+					return FLUSH_GIVEUP;
+				}
+				/*
+				 * delays can hang the simulator
+				   udelay(1000);
+				 */
+				destination_timeouts = 0;
+			}
+		}
+	}
+	return FLUSH_COMPLETE;
+}
+
+/**
+ * uv_flush_send_and_wait
+ *
+ * Send a broadcast and wait for a broadcast message to complete.
+ *
+ * The cpumaskp mask contains the cpus the broadcast was sent to.
+ *
+ * Returns 1 if all remote flushing was done. The mask is zeroed.
+ * Returns 0 if some remote flushing remains to be done. The mask is left
+ * unchanged.
+ */
+int uv_flush_send_and_wait(int cpu, int this_blade, struct bau_desc *bau_desc,
+			   cpumask_t *cpumaskp)
+{
+	int completion_status = 0;
+	int right_shift;
+	int tries = 0;
+	int blade;
+	int bit;
+	unsigned long mmr_offset;
+	unsigned long index;
+	cycles_t time1;
+	cycles_t time2;
+
+	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 {
+		tries++;
+		index = (1UL << UVH_LB_BAU_SB_ACTIVATION_CONTROL_PUSH_SHFT) |
+			cpu;
+		uv_write_local_mmr(UVH_LB_BAU_SB_ACTIVATION_CONTROL, index);
+		completion_status = uv_wait_completion(bau_desc, mmr_offset,
+					right_shift);
+	} while (completion_status == FLUSH_RETRY);
+	time2 = get_cycles();
+	__get_cpu_var(ptcstats).sflush += (time2 - time1);
+	if (tries > 1)
+		__get_cpu_var(ptcstats).retriesok++;
+
+	if (completion_status == FLUSH_GIVEUP) {
+		/*
+		 * Cause the caller to do an IPI-style TLB shootdown on
+		 * the cpu's, all of which are still in the mask.
+		 */
+		__get_cpu_var(ptcstats).ptc_i++;
+		return 0;
+	}
+
+	/*
+	 * Success, so clear the remote cpu's from the mask so we don't
+	 * use the IPI method of shootdown on them.
+	 */
+	for_each_cpu_mask(bit, *cpumaskp) {
+		blade = uv_cpu_to_blade_id(bit);
+		if (blade == this_blade)
+			continue;
+		cpu_clear(bit, *cpumaskp);
+	}
+	if (!cpus_empty(*cpumaskp))
+		return 0;
+	return 1;
+}
+
+/**
+ * uv_flush_tlb_others - globally purge translation cache of a virtual
+ * address or all TLB's
+ * @cpumaskp: 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)
+ *
+ * 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 cpumaskp from the mm_struct and has subtracted
+ * the local cpu from the mask.  This function is called only if there
+ * are bits set in the mask. (e.g. flush_tlb_page())
+ *
+ * The cpumaskp is converted into a nodemask of the nodes containing
+ * the cpus.
+ *
+ * Returns 1 if all remote flushing was done.
+ * Returns 0 if some remote flushing remains to be done.
+ */
+int uv_flush_tlb_others(cpumask_t *cpumaskp, struct mm_struct *mm,
+			unsigned long va)
+{
+	int i;
+	int bit;
+	int blade;
+	int cpu;
+	int this_blade;
+	int locals = 0;
+	struct bau_desc *bau_desc;
+
+	cpu = uv_blade_processor_id();
+	this_blade = uv_numa_blade_id();
+	bau_desc = __get_cpu_var(bau_control).descriptor_base;
+	bau_desc += UV_ITEMS_PER_DESCRIPTOR * cpu;
+
+	bau_nodes_clear(&bau_desc->distribution, UV_DISTRIBUTION_SIZE);
+
+	i = 0;
+	for_each_cpu_mask(bit, *cpumaskp) {
+		blade = uv_cpu_to_blade_id(bit);
+		BUG_ON(blade > (UV_DISTRIBUTION_SIZE - 1));
+		if (blade == this_blade) {
+			locals++;
+			continue;
+		}
+		bau_node_set(blade, &bau_desc->distribution);
+		i++;
+	}
+	if (i == 0) {
+		/*
+		 * no off_node flushing; return status for local node
+		 */
+		if (locals)
+			return 0;
+		else
+			return 1;
+	}
+	__get_cpu_var(ptcstats).requestor++;
+	__get_cpu_var(ptcstats).ntargeted += i;
+
+	bau_desc->payload.address = va;
+	bau_desc->payload.sending_cpu = smp_processor_id();
+
+	return uv_flush_send_and_wait(cpu, this_blade, bau_desc, cpumaskp);
+}
+
+/*
+ * The BAU message interrupt comes here. (registered by set_intr_gate)
+ * See entry_64.S
+ *
+ * We received a broadcast assist message.
+ *
+ * Interrupts may have been disabled; this interrupt could represent
+ * the receipt of several messages.
+ *
+ * All cores/threads on this node get this interrupt.
+ * The last one to see it does the s/w ack.
+ * (the resource will not be freed until noninterruptable cpus see this
+ *  interrupt; hardware will timeout the s/w ack and reply ERROR)
+ */
+void uv_bau_message_interrupt(struct pt_regs *regs)
+{
+	struct bau_payload_queue_entry *va_queue_first;
+	struct bau_payload_queue_entry *va_queue_last;
+	struct bau_payload_queue_entry *msg;
+	struct pt_regs *old_regs = set_irq_regs(regs);
+	cycles_t time1;
+	cycles_t time2;
+	int msg_slot;
+	int sw_ack_slot;
+	int fw;
+	int count = 0;
+	unsigned long local_pnode;
+
+	ack_APIC_irq();
+	exit_idle();
+	irq_enter();
+
+	time1 = get_cycles();
+
+	local_pnode = uv_blade_to_pnode(uv_numa_blade_id());
+
+	va_queue_first = __get_cpu_var(bau_control).va_queue_first;
+	va_queue_last = __get_cpu_var(bau_control).va_queue_last;
+
+	msg = __get_cpu_var(bau_control).bau_msg_head;
+	while (msg->sw_ack_vector) {
+		count++;
+		fw = msg->sw_ack_vector;
+		msg_slot = msg - va_queue_first;
+		sw_ack_slot = ffs(fw) - 1;
+
+		uv_bau_process_message(msg, msg_slot, sw_ack_slot);
+
+		msg++;
+		if (msg > va_queue_last)
+			msg = va_queue_first;
+		__get_cpu_var(bau_control).bau_msg_head = msg;
+	}
+	if (!count)
+		__get_cpu_var(ptcstats).nomsg++;
+	else if (count > 1)
+		__get_cpu_var(ptcstats).multmsg++;
+
+	time2 = get_cycles();
+	__get_cpu_var(ptcstats).dflush += (time2 - time1);
+
+	irq_exit();
+	set_irq_regs(old_regs);
+}
+
+static void uv_enable_timeouts(void)
+{
+	int i;
+	int blade;
+	int last_blade;
+	int pnode;
+	int cur_cpu = 0;
+	unsigned long apicid;
+
+	last_blade = -1;
+	for_each_online_node(i) {
+		blade = uv_node_to_blade_id(i);
+		if (blade == last_blade)
+			continue;
+		last_blade = blade;
+		apicid = per_cpu(x86_cpu_to_apicid, cur_cpu);
+		pnode = uv_blade_to_pnode(blade);
+		cur_cpu += uv_blade_nr_possible_cpus(i);
+	}
+}
+
+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)
+{
+}
+
+/*
+ * 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 requestor requestee one all sretry dretry ptc_i ");
+		seq_printf(file,
+		"sw_ack sflush dflush sok dnomsg dmult starget\n");
+	}
+	if (cpu < num_possible_cpus() && cpu_online(cpu)) {
+		stat = &per_cpu(ptcstats, cpu);
+		seq_printf(file, "cpu %d %ld %ld %ld %ld %ld %ld %ld ",
+			   cpu, stat->requestor,
+			   stat->requestee, stat->onetlb, stat->alltlb,
+			   stat->s_retry, stat->d_retry, stat->ptc_i);
+		seq_printf(file, "%lx %ld %ld %ld %ld %ld %ld\n",
+			   uv_read_global_mmr64(uv_blade_to_pnode
+					(uv_cpu_to_blade_id(cpu)),
+					UVH_LB_BAU_INTD_SOFTWARE_ACKNOWLEDGE),
+			   stat->sflush, stat->dflush,
+			   stat->retriesok, stat->nomsg,
+			   stat->multmsg, stat->ntargeted);
+	}
+
+	return 0;
+}
+
+/*
+ *  0: display meaning of the statistics
+ * >0: retry limit
+ */
+static ssize_t uv_ptc_proc_write(struct file *file, const char __user *user,
+				 size_t count, loff_t *data)
+{
+	long newmode;
+	char optstr[64];
+
+	if (count == 0 || count > sizeof(optstr))
+		return -EINVAL;
+	if (copy_from_user(optstr, user, count))
+		return -EFAULT;
+	optstr[count - 1] = '\0';
+	if (strict_strtoul(optstr, 10, &newmode) < 0) {
+		printk(KERN_DEBUG "%s is invalid\n", optstr);
+		return -EINVAL;
+	}
+
+	if (newmode == 0) {
+		printk(KERN_DEBUG "# cpu:      cpu number\n");
+		printk(KERN_DEBUG
+		"requestor:  times this cpu was the flush requestor\n");
+		printk(KERN_DEBUG
+		"requestee:  times this cpu was requested to flush its TLBs\n");
+		printk(KERN_DEBUG
+		"one:        times requested to flush a single address\n");
+		printk(KERN_DEBUG
+		"all:        times requested to flush all TLB's\n");
+		printk(KERN_DEBUG
+		"sretry:     number of retries of source-side timeouts\n");
+		printk(KERN_DEBUG
+		"dretry:     number of retries of destination-side timeouts\n");
+		printk(KERN_DEBUG
+		"ptc_i:      times UV fell through to IPI-style flushes\n");
+		printk(KERN_DEBUG
+		"sw_ack:     image of UVH_LB_BAU_INTD_SOFTWARE_ACKNOWLEDGE\n");
+		printk(KERN_DEBUG
+		"sflush_us:  cycles spent in uv_flush_tlb_others()\n");
+		printk(KERN_DEBUG
+		"dflush_us:  cycles spent in handling flush requests\n");
+		printk(KERN_DEBUG "sok:        successes on retry\n");
+		printk(KERN_DEBUG "dnomsg:     interrupts with no message\n");
+		printk(KERN_DEBUG
+		"dmult:      interrupts with multiple messages\n");
+		printk(KERN_DEBUG "starget:    nodes targeted\n");
+	} else {
+		uv_bau_retry_limit = newmode;
+		printk(KERN_DEBUG "timeout retry limit:%d\n",
+		       uv_bau_retry_limit);
+	}
+
+	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 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 int __init uv_ptc_init(void)
+{
+	struct proc_dir_entry *proc_uv_ptc;
+
+	if (!is_uv_system())
+		return 0;
+
+	if (!proc_mkdir("sgi_uv", NULL))
+		return -EINVAL;
+
+	proc_uv_ptc = create_proc_entry(UV_PTC_BASENAME, 0444, NULL);
+	if (!proc_uv_ptc) {
+		printk(KERN_ERR "unable to create %s proc entry\n",
+		       UV_PTC_BASENAME);
+		remove_proc_entry("sgi_uv", NULL);
+		return -EINVAL;
+	}
+	proc_uv_ptc->proc_fops = &proc_uv_ptc_operations;
+	return 0;
+}
+
+/*
+ * begin the initialization of the per-blade control structures
+ */
+static struct bau_control * __init uv_table_bases_init(int blade, int node)
+{
+	int i;
+	int *ip;
+	struct bau_msg_status *msp;
+	struct bau_control *bau_tabp;
+
+	bau_tabp =
+	    kmalloc_node(sizeof(struct bau_control), GFP_KERNEL, node);
+	BUG_ON(!bau_tabp);
+
+	bau_tabp->msg_statuses =
+	    kmalloc_node(sizeof(struct bau_msg_status) *
+			 DEST_Q_SIZE, GFP_KERNEL, node);
+	BUG_ON(!bau_tabp->msg_statuses);
+
+	for (i = 0, msp = bau_tabp->msg_statuses; i < DEST_Q_SIZE; i++, msp++)
+		bau_cpubits_clear(&msp->seen_by, (int)
+				  uv_blade_nr_possible_cpus(blade));
+
+	bau_tabp->watching =
+	    kmalloc_node(sizeof(int) * DEST_NUM_RESOURCES, GFP_KERNEL, node);
+	BUG_ON(!bau_tabp->watching);
+
+	for (i = 0, ip = bau_tabp->watching; i < DEST_Q_SIZE; i++, ip++)
+		*ip = 0;
+
+	uv_bau_table_bases[blade] = bau_tabp;
+
+	return bau_tabp;
+}
+
+/*
+ * finish the initialization of the per-blade control structures
+ */
+static void __init
+uv_table_bases_finish(int blade, int node, int cur_cpu,
+		      struct bau_control *bau_tablesp,
+		      struct bau_desc *adp)
+{
+	struct bau_control *bcp;
+	int i;
+
+	for (i = cur_cpu; i < cur_cpu + uv_blade_nr_possible_cpus(blade); i++) {
+		bcp = (struct bau_control *)&per_cpu(bau_control, i);
+
+		bcp->bau_msg_head	= bau_tablesp->va_queue_first;
+		bcp->va_queue_first	= bau_tablesp->va_queue_first;
+		bcp->va_queue_last	= bau_tablesp->va_queue_last;
+		bcp->watching		= bau_tablesp->watching;
+		bcp->msg_statuses	= bau_tablesp->msg_statuses;
+		bcp->descriptor_base	= adp;
+	}
+}
+
+/*
+ * initialize the sending side's sending buffers
+ */
+static struct bau_desc * __init
+uv_activation_descriptor_init(int node, int pnode)
+{
+	int i;
+	unsigned long pa;
+	unsigned long m;
+	unsigned long n;
+	unsigned long mmr_image;
+	struct bau_desc *adp;
+	struct bau_desc *ad2;
+
+	adp = (struct bau_desc *)
+	    kmalloc_node(16384, GFP_KERNEL, node);
+	BUG_ON(!adp);
+
+	pa = __pa((unsigned long)adp);
+	n = pa >> uv_nshift;
+	m = pa & uv_mmask;
+
+	mmr_image = uv_read_global_mmr64(pnode, UVH_LB_BAU_SB_DESCRIPTOR_BASE);
+	if (mmr_image) {
+		uv_write_global_mmr64(pnode, (unsigned long)
+				      UVH_LB_BAU_SB_DESCRIPTOR_BASE,
+				      (n << UV_DESC_BASE_PNODE_SHIFT | m));
+	}
+
+	for (i = 0, ad2 = adp; i < UV_ACTIVATION_DESCRIPTOR_SIZE; i++, ad2++) {
+		memset(ad2, 0, sizeof(struct bau_desc));
+		ad2->header.sw_ack_flag = 1;
+		ad2->header.base_dest_nodeid =
+		    uv_blade_to_pnode(uv_cpu_to_blade_id(0));
+		ad2->header.command = UV_NET_ENDPOINT_INTD;
+		ad2->header.int_both = 1;
+		/*
+		 * all others need to be set to zero:
+		 *   fairness chaining multilevel count replied_to
+		 */
+	}
+	return adp;
+}
+
+/*
+ * initialize the destination side's receiving buffers
+ */
+static struct bau_payload_queue_entry * __init
+uv_payload_queue_init(int node, int pnode, struct bau_control *bau_tablesp)
+{
+	struct bau_payload_queue_entry *pqp;
+	char *cp;
+
+	pqp = (struct bau_payload_queue_entry *) kmalloc_node(
+		(DEST_Q_SIZE + 1) * sizeof(struct bau_payload_queue_entry),
+		GFP_KERNEL, node);
+	BUG_ON(!pqp);
+
+	cp = (char *)pqp + 31;
+	pqp = (struct bau_payload_queue_entry *)(((unsigned long)cp >> 5) << 5);
+	bau_tablesp->va_queue_first = pqp;
+	uv_write_global_mmr64(pnode,
+			      UVH_LB_BAU_INTD_PAYLOAD_QUEUE_FIRST,
+			      ((unsigned long)pnode <<
+			       UV_PAYLOADQ_PNODE_SHIFT) |
+			      uv_physnodeaddr(pqp));
+	uv_write_global_mmr64(pnode, UVH_LB_BAU_INTD_PAYLOAD_QUEUE_TAIL,
+			      uv_physnodeaddr(pqp));
+	bau_tablesp->va_queue_last = pqp + (DEST_Q_SIZE - 1);
+	uv_write_global_mmr64(pnode, UVH_LB_BAU_INTD_PAYLOAD_QUEUE_LAST,
+			      (unsigned long)
+			      uv_physnodeaddr(bau_tablesp->va_queue_last));
+	memset(pqp, 0, sizeof(struct bau_payload_queue_entry) * DEST_Q_SIZE);
+
+	return pqp;
+}
+
+/*
+ * Initialization of each UV blade's structures
+ */
+static int __init uv_init_blade(int blade, int node, int cur_cpu)
+{
+	int pnode;
+	unsigned long pa;
+	unsigned long apicid;
+	struct bau_desc *adp;
+	struct bau_payload_queue_entry *pqp;
+	struct bau_control *bau_tablesp;
+
+	bau_tablesp = uv_table_bases_init(blade, node);
+	pnode = uv_blade_to_pnode(blade);
+	adp = uv_activation_descriptor_init(node, pnode);
+	pqp = uv_payload_queue_init(node, pnode, bau_tablesp);
+	uv_table_bases_finish(blade, node, cur_cpu, bau_tablesp, adp);
+	/*
+	 * the below initialization can't be in firmware because the
+	 * messaging IRQ will be determined by the OS
+	 */
+	apicid = per_cpu(x86_cpu_to_apicid, cur_cpu);
+	pa = uv_read_global_mmr64(pnode, UVH_BAU_DATA_CONFIG);
+	if ((pa & 0xff) != UV_BAU_MESSAGE) {
+		uv_write_global_mmr64(pnode, UVH_BAU_DATA_CONFIG,
+				      ((apicid << 32) | UV_BAU_MESSAGE));
+	}
+	return 0;
+}
+
+/*
+ * Initialization of BAU-related structures
+ */
+static int __init uv_bau_init(void)
+{
+	int blade;
+	int node;
+	int nblades;
+	int last_blade;
+	int cur_cpu = 0;
+
+	if (!is_uv_system())
+		return 0;
+
+	uv_bau_retry_limit = 1;
+	uv_nshift = uv_hub_info->n_val;
+	uv_mmask = (1UL << uv_hub_info->n_val) - 1;
+	nblades = 0;
+	last_blade = -1;
+	for_each_online_node(node) {
+		blade = uv_node_to_blade_id(node);
+		if (blade == last_blade)
+			continue;
+		last_blade = blade;
+		nblades++;
+	}
+	uv_bau_table_bases = (struct bau_control **)
+	    kmalloc(nblades * sizeof(struct bau_control *), GFP_KERNEL);
+	BUG_ON(!uv_bau_table_bases);
+
+	last_blade = -1;
+	for_each_online_node(node) {
+		blade = uv_node_to_blade_id(node);
+		if (blade == last_blade)
+			continue;
+		last_blade = blade;
+		uv_init_blade(blade, node, cur_cpu);
+		cur_cpu += uv_blade_nr_possible_cpus(blade);
+	}
+	set_intr_gate(UV_BAU_MESSAGE, uv_bau_message_intr1);
+	uv_enable_timeouts();
+
+	return 0;
+}
+__initcall(uv_bau_init);
+__initcall(uv_ptc_init);