7 files changed, 806 insertions, 6 deletions

diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile
index 8ef4dbf32cf9..9a71be827927 100644
--- a/arch/x86/kernel/Makefile
+++ b/arch/x86/kernel/Makefile
@@ -93,7 +93,7 @@ obj-$(CONFIG_OLPC)		+= olpc.o
 ###
 # 64 bit specific files
 ifeq ($(CONFIG_X86_64),y)
-        obj-y                           += genapic_64.o genapic_flat_64.o genx2apic_uv_x.o
+        obj-y                           += genapic_64.o genapic_flat_64.o genx2apic_uv_x.o tlb_uv.o
         obj-$(CONFIG_X86_PM_TIMER)      += pmtimer_64.o
         obj-$(CONFIG_AUDIT)             += audit_64.o
 
diff --git a/arch/x86/kernel/apic_32.c b/arch/x86/kernel/apic_32.c
index 84ce106b33c8..dd8de26b2786 100644
--- a/arch/x86/kernel/apic_32.c
+++ b/arch/x86/kernel/apic_32.c
@@ -1267,7 +1267,7 @@ int __init APIC_init_uniprocessor(void)
 #ifdef CONFIG_CRASH_DUMP
         boot_cpu_physical_apicid = GET_APIC_ID(read_apic_id());
 #endif
-        phys_cpu_present_map = physid_mask_of_physid(boot_cpu_physical_apicid);
+        physid_set_mask_of_physid(boot_cpu_physical_apicid, &phys_cpu_present_map);
 
         setup_local_APIC();
 
diff --git a/arch/x86/kernel/apic_64.c b/arch/x86/kernel/apic_64.c
index e494809fc508..d9d663ffa641 100644
--- a/arch/x86/kernel/apic_64.c
+++ b/arch/x86/kernel/apic_64.c
@@ -918,7 +918,7 @@ int __init APIC_init_uniprocessor(void)
 
         verify_local_APIC();
 
-        phys_cpu_present_map = physid_mask_of_physid(boot_cpu_physical_apicid);
+        physid_set_mask_of_physid(boot_cpu_physical_apicid, &phys_cpu_present_map);
         apic_write(APIC_ID, SET_APIC_ID(boot_cpu_physical_apicid));
 
         setup_local_APIC();
diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S
index e4c5f951e68d..ff15ab552280 100644
--- a/arch/x86/kernel/entry_64.S
+++ b/arch/x86/kernel/entry_64.S
@@ -719,6 +719,10 @@ ENTRY(apic_timer_interrupt)
         apicinterrupt LOCAL_TIMER_VECTOR,smp_apic_timer_interrupt
 END(apic_timer_interrupt)
 
+ENTRY(uv_bau_message_intr1)
+        apicinterrupt 220,uv_bau_message_interrupt
+END(uv_bau_message_intr1)
+
 ENTRY(error_interrupt)
         apicinterrupt ERROR_APIC_VECTOR,smp_error_interrupt
 END(error_interrupt)
diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index ae0a7a200421..d3ad4e09455b 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -1090,10 +1090,9 @@ static __init void disable_smp(void)
         smpboot_clear_io_apic_irqs();
 #endif
         if (smp_found_config)
-                phys_cpu_present_map =
-                                physid_mask_of_physid(boot_cpu_physical_apicid);
+                physid_set_mask_of_physid(boot_cpu_physical_apicid, &phys_cpu_present_map);
         else
-                phys_cpu_present_map = physid_mask_of_physid(0);
+                physid_set_mask_of_physid(0, &phys_cpu_present_map);
         map_cpu_to_logical_apicid();
         cpu_set(0, per_cpu(cpu_sibling_map, 0));
         cpu_set(0, per_cpu(cpu_core_map, 0));
diff --git a/arch/x86/kernel/tlb_64.c b/arch/x86/kernel/tlb_64.c
index a1f07d793202..5039d0f097a2 100644
--- a/arch/x86/kernel/tlb_64.c
+++ b/arch/x86/kernel/tlb_64.c
@@ -15,6 +15,8 @@
 #include <asm/proto.h>
 #include <asm/apicdef.h>
 #include <asm/idle.h>
+#include <asm/uv/uv_hub.h>
+#include <asm/uv/uv_bau.h>
 
 #include <mach_ipi.h>
 /*
@@ -162,6 +164,9 @@ void native_flush_tlb_others(const cpumask_t *cpumaskp, struct mm_struct *mm,
         union smp_flush_state *f;
         cpumask_t cpumask = *cpumaskp;
 
+        if (is_uv_system() && uv_flush_tlb_others(&cpumask, mm, va))
+                return;
+
         /* Caller has disabled preemption */
         sender = smp_processor_id() % NUM_INVALIDATE_TLB_VECTORS;
         f = &per_cpu(flush_state, sender);
diff --git a/arch/x86/kernel/tlb_uv.c b/arch/x86/kernel/tlb_uv.c
new file mode 100644
index 000000000000..d0fbb7712ab0
--- /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);