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-rw-r--r--arch/ia64/sn/kernel/sn2/sn2_smp.c577
1 files changed, 0 insertions, 577 deletions
diff --git a/arch/ia64/sn/kernel/sn2/sn2_smp.c b/arch/ia64/sn/kernel/sn2/sn2_smp.c
deleted file mode 100644
index b510f4f17fd4..000000000000
--- a/arch/ia64/sn/kernel/sn2/sn2_smp.c
+++ /dev/null
@@ -1,577 +0,0 @@
-/*
- * SN2 Platform specific SMP Support
- *
- * This file is subject to the terms and conditions of the GNU General Public
- * License. See the file "COPYING" in the main directory of this archive
- * for more details.
- *
- * Copyright (C) 2000-2006 Silicon Graphics, Inc. All rights reserved.
- */
-
-#include <linux/init.h>
-#include <linux/kernel.h>
-#include <linux/spinlock.h>
-#include <linux/threads.h>
-#include <linux/sched.h>
-#include <linux/mm_types.h>
-#include <linux/smp.h>
-#include <linux/interrupt.h>
-#include <linux/irq.h>
-#include <linux/mmzone.h>
-#include <linux/module.h>
-#include <linux/bitops.h>
-#include <linux/nodemask.h>
-#include <linux/proc_fs.h>
-#include <linux/seq_file.h>
-
-#include <asm/processor.h>
-#include <asm/irq.h>
-#include <asm/sal.h>
-#include <asm/delay.h>
-#include <asm/io.h>
-#include <asm/smp.h>
-#include <asm/tlb.h>
-#include <asm/numa.h>
-#include <asm/hw_irq.h>
-#include <asm/current.h>
-#include <asm/sn/sn_cpuid.h>
-#include <asm/sn/sn_sal.h>
-#include <asm/sn/addrs.h>
-#include <asm/sn/shub_mmr.h>
-#include <asm/sn/nodepda.h>
-#include <asm/sn/rw_mmr.h>
-#include <asm/sn/sn_feature_sets.h>
-
-DEFINE_PER_CPU(struct ptc_stats, ptcstats);
-DECLARE_PER_CPU(struct ptc_stats, ptcstats);
-
-static __cacheline_aligned DEFINE_SPINLOCK(sn2_global_ptc_lock);
-
-/* 0 = old algorithm (no IPI flushes), 1 = ipi deadlock flush, 2 = ipi instead of SHUB ptc, >2 = always ipi */
-static int sn2_flush_opt = 0;
-
-extern unsigned long
-sn2_ptc_deadlock_recovery_core(volatile unsigned long *, unsigned long,
- volatile unsigned long *, unsigned long,
- volatile unsigned long *, unsigned long);
-void
-sn2_ptc_deadlock_recovery(nodemask_t, short, short, int,
- volatile unsigned long *, unsigned long,
- volatile unsigned long *, unsigned long);
-
-/*
- * Note: some is the following is captured here to make degugging easier
- * (the macros make more sense if you see the debug patch - not posted)
- */
-#define sn2_ptctest 0
-#define local_node_uses_ptc_ga(sh1) ((sh1) ? 1 : 0)
-#define max_active_pio(sh1) ((sh1) ? 32 : 7)
-#define reset_max_active_on_deadlock() 1
-#define PTC_LOCK(sh1) ((sh1) ? &sn2_global_ptc_lock : &sn_nodepda->ptc_lock)
-
-struct ptc_stats {
- unsigned long ptc_l;
- unsigned long change_rid;
- unsigned long shub_ptc_flushes;
- unsigned long nodes_flushed;
- unsigned long deadlocks;
- unsigned long deadlocks2;
- unsigned long lock_itc_clocks;
- unsigned long shub_itc_clocks;
- unsigned long shub_itc_clocks_max;
- unsigned long shub_ptc_flushes_not_my_mm;
- unsigned long shub_ipi_flushes;
- unsigned long shub_ipi_flushes_itc_clocks;
-};
-
-#define sn2_ptctest 0
-
-static inline unsigned long wait_piowc(void)
-{
- volatile unsigned long *piows;
- unsigned long zeroval, ws;
-
- piows = pda->pio_write_status_addr;
- zeroval = pda->pio_write_status_val;
- do {
- cpu_relax();
- } while (((ws = *piows) & SH_PIO_WRITE_STATUS_PENDING_WRITE_COUNT_MASK) != zeroval);
- return (ws & SH_PIO_WRITE_STATUS_WRITE_DEADLOCK_MASK) != 0;
-}
-
-/**
- * sn_migrate - SN-specific task migration actions
- * @task: Task being migrated to new CPU
- *
- * SN2 PIO writes from separate CPUs are not guaranteed to arrive in order.
- * Context switching user threads which have memory-mapped MMIO may cause
- * PIOs to issue from separate CPUs, thus the PIO writes must be drained
- * from the previous CPU's Shub before execution resumes on the new CPU.
- */
-void sn_migrate(struct task_struct *task)
-{
- pda_t *last_pda = pdacpu(task_thread_info(task)->last_cpu);
- volatile unsigned long *adr = last_pda->pio_write_status_addr;
- unsigned long val = last_pda->pio_write_status_val;
-
- /* Drain PIO writes from old CPU's Shub */
- while (unlikely((*adr & SH_PIO_WRITE_STATUS_PENDING_WRITE_COUNT_MASK)
- != val))
- cpu_relax();
-}
-
-static void
-sn2_ipi_flush_all_tlb(struct mm_struct *mm)
-{
- unsigned long itc;
-
- itc = ia64_get_itc();
- smp_flush_tlb_cpumask(*mm_cpumask(mm));
- itc = ia64_get_itc() - itc;
- __this_cpu_add(ptcstats.shub_ipi_flushes_itc_clocks, itc);
- __this_cpu_inc(ptcstats.shub_ipi_flushes);
-}
-
-/**
- * sn2_global_tlb_purge - globally purge translation cache of virtual address range
- * @mm: mm_struct containing virtual address range
- * @start: start of virtual address range
- * @end: end of virtual address range
- * @nbits: specifies number of bytes to purge per instruction (num = 1<<(nbits & 0xfc))
- *
- * Purges the translation caches of all processors of the given virtual address
- * range.
- *
- * Note:
- * - cpu_vm_mask is a bit mask that indicates which cpus have loaded the context.
- * - cpu_vm_mask is converted into a nodemask of the nodes containing the
- * cpus in cpu_vm_mask.
- * - if only one bit is set in cpu_vm_mask & it is the current cpu & the
- * process is purging its own virtual address range, then only the
- * local TLB needs to be flushed. This flushing can be done using
- * ptc.l. This is the common case & avoids the global spinlock.
- * - if multiple cpus have loaded the context, then flushing has to be
- * done with ptc.g/MMRs under protection of the global ptc_lock.
- */
-
-void
-sn2_global_tlb_purge(struct mm_struct *mm, unsigned long start,
- unsigned long end, unsigned long nbits)
-{
- int i, ibegin, shub1, cnode, mynasid, cpu, lcpu = 0, nasid;
- int mymm = (mm == current->active_mm && mm == current->mm);
- int use_cpu_ptcga;
- volatile unsigned long *ptc0, *ptc1;
- unsigned long itc, itc2, flags, data0 = 0, data1 = 0, rr_value, old_rr = 0;
- short nix;
- nodemask_t nodes_flushed;
- int active, max_active, deadlock, flush_opt = sn2_flush_opt;
-
- if (flush_opt > 2) {
- sn2_ipi_flush_all_tlb(mm);
- return;
- }
-
- nodes_clear(nodes_flushed);
- i = 0;
-
- for_each_cpu(cpu, mm_cpumask(mm)) {
- cnode = cpu_to_node(cpu);
- node_set(cnode, nodes_flushed);
- lcpu = cpu;
- i++;
- }
-
- if (i == 0)
- return;
-
- preempt_disable();
-
- if (likely(i == 1 && lcpu == smp_processor_id() && mymm)) {
- do {
- ia64_ptcl(start, nbits << 2);
- start += (1UL << nbits);
- } while (start < end);
- ia64_srlz_i();
- __this_cpu_inc(ptcstats.ptc_l);
- preempt_enable();
- return;
- }
-
- if (atomic_read(&mm->mm_users) == 1 && mymm) {
- flush_tlb_mm(mm);
- __this_cpu_inc(ptcstats.change_rid);
- preempt_enable();
- return;
- }
-
- if (flush_opt == 2) {
- sn2_ipi_flush_all_tlb(mm);
- preempt_enable();
- return;
- }
-
- itc = ia64_get_itc();
- nix = nodes_weight(nodes_flushed);
-
- rr_value = (mm->context << 3) | REGION_NUMBER(start);
-
- shub1 = is_shub1();
- if (shub1) {
- data0 = (1UL << SH1_PTC_0_A_SHFT) |
- (nbits << SH1_PTC_0_PS_SHFT) |
- (rr_value << SH1_PTC_0_RID_SHFT) |
- (1UL << SH1_PTC_0_START_SHFT);
- ptc0 = (long *)GLOBAL_MMR_PHYS_ADDR(0, SH1_PTC_0);
- ptc1 = (long *)GLOBAL_MMR_PHYS_ADDR(0, SH1_PTC_1);
- } else {
- data0 = (1UL << SH2_PTC_A_SHFT) |
- (nbits << SH2_PTC_PS_SHFT) |
- (1UL << SH2_PTC_START_SHFT);
- ptc0 = (long *)GLOBAL_MMR_PHYS_ADDR(0, SH2_PTC +
- (rr_value << SH2_PTC_RID_SHFT));
- ptc1 = NULL;
- }
-
-
- mynasid = get_nasid();
- use_cpu_ptcga = local_node_uses_ptc_ga(shub1);
- max_active = max_active_pio(shub1);
-
- itc = ia64_get_itc();
- spin_lock_irqsave(PTC_LOCK(shub1), flags);
- itc2 = ia64_get_itc();
-
- __this_cpu_add(ptcstats.lock_itc_clocks, itc2 - itc);
- __this_cpu_inc(ptcstats.shub_ptc_flushes);
- __this_cpu_add(ptcstats.nodes_flushed, nix);
- if (!mymm)
- __this_cpu_inc(ptcstats.shub_ptc_flushes_not_my_mm);
-
- if (use_cpu_ptcga && !mymm) {
- old_rr = ia64_get_rr(start);
- ia64_set_rr(start, (old_rr & 0xff) | (rr_value << 8));
- ia64_srlz_d();
- }
-
- wait_piowc();
- do {
- if (shub1)
- data1 = start | (1UL << SH1_PTC_1_START_SHFT);
- else
- data0 = (data0 & ~SH2_PTC_ADDR_MASK) | (start & SH2_PTC_ADDR_MASK);
- deadlock = 0;
- active = 0;
- ibegin = 0;
- i = 0;
- for_each_node_mask(cnode, nodes_flushed) {
- nasid = cnodeid_to_nasid(cnode);
- if (use_cpu_ptcga && unlikely(nasid == mynasid)) {
- ia64_ptcga(start, nbits << 2);
- ia64_srlz_i();
- } else {
- ptc0 = CHANGE_NASID(nasid, ptc0);
- if (ptc1)
- ptc1 = CHANGE_NASID(nasid, ptc1);
- pio_atomic_phys_write_mmrs(ptc0, data0, ptc1, data1);
- active++;
- }
- if (active >= max_active || i == (nix - 1)) {
- if ((deadlock = wait_piowc())) {
- if (flush_opt == 1)
- goto done;
- sn2_ptc_deadlock_recovery(nodes_flushed, ibegin, i, mynasid, ptc0, data0, ptc1, data1);
- if (reset_max_active_on_deadlock())
- max_active = 1;
- }
- active = 0;
- ibegin = i + 1;
- }
- i++;
- }
- start += (1UL << nbits);
- } while (start < end);
-
-done:
- itc2 = ia64_get_itc() - itc2;
- __this_cpu_add(ptcstats.shub_itc_clocks, itc2);
- if (itc2 > __this_cpu_read(ptcstats.shub_itc_clocks_max))
- __this_cpu_write(ptcstats.shub_itc_clocks_max, itc2);
-
- if (old_rr) {
- ia64_set_rr(start, old_rr);
- ia64_srlz_d();
- }
-
- spin_unlock_irqrestore(PTC_LOCK(shub1), flags);
-
- if (flush_opt == 1 && deadlock) {
- __this_cpu_inc(ptcstats.deadlocks);
- sn2_ipi_flush_all_tlb(mm);
- }
-
- preempt_enable();
-}
-
-/*
- * sn2_ptc_deadlock_recovery
- *
- * Recover from PTC deadlocks conditions. Recovery requires stepping thru each
- * TLB flush transaction. The recovery sequence is somewhat tricky & is
- * coded in assembly language.
- */
-
-void
-sn2_ptc_deadlock_recovery(nodemask_t nodes, short ib, short ie, int mynasid,
- volatile unsigned long *ptc0, unsigned long data0,
- volatile unsigned long *ptc1, unsigned long data1)
-{
- short nasid, i;
- int cnode;
- unsigned long *piows, zeroval, n;
-
- __this_cpu_inc(ptcstats.deadlocks);
-
- piows = (unsigned long *) pda->pio_write_status_addr;
- zeroval = pda->pio_write_status_val;
-
- i = 0;
- for_each_node_mask(cnode, nodes) {
- if (i < ib)
- goto next;
-
- if (i > ie)
- break;
-
- nasid = cnodeid_to_nasid(cnode);
- if (local_node_uses_ptc_ga(is_shub1()) && nasid == mynasid)
- goto next;
-
- ptc0 = CHANGE_NASID(nasid, ptc0);
- if (ptc1)
- ptc1 = CHANGE_NASID(nasid, ptc1);
-
- n = sn2_ptc_deadlock_recovery_core(ptc0, data0, ptc1, data1, piows, zeroval);
- __this_cpu_add(ptcstats.deadlocks2, n);
-next:
- i++;
- }
-
-}
-
-/**
- * sn_send_IPI_phys - send an IPI to a Nasid and slice
- * @nasid: nasid to receive the interrupt (may be outside partition)
- * @physid: physical cpuid to receive the interrupt.
- * @vector: command to send
- * @delivery_mode: delivery mechanism
- *
- * Sends an IPI (interprocessor interrupt) to the processor specified by
- * @physid
- *
- * @delivery_mode can be one of the following
- *
- * %IA64_IPI_DM_INT - pend an interrupt
- * %IA64_IPI_DM_PMI - pend a PMI
- * %IA64_IPI_DM_NMI - pend an NMI
- * %IA64_IPI_DM_INIT - pend an INIT interrupt
- */
-void sn_send_IPI_phys(int nasid, long physid, int vector, int delivery_mode)
-{
- long val;
- unsigned long flags = 0;
- volatile long *p;
-
- p = (long *)GLOBAL_MMR_PHYS_ADDR(nasid, SH_IPI_INT);
- val = (1UL << SH_IPI_INT_SEND_SHFT) |
- (physid << SH_IPI_INT_PID_SHFT) |
- ((long)delivery_mode << SH_IPI_INT_TYPE_SHFT) |
- ((long)vector << SH_IPI_INT_IDX_SHFT) |
- (0x000feeUL << SH_IPI_INT_BASE_SHFT);
-
- mb();
- if (enable_shub_wars_1_1()) {
- spin_lock_irqsave(&sn2_global_ptc_lock, flags);
- }
- pio_phys_write_mmr(p, val);
- if (enable_shub_wars_1_1()) {
- wait_piowc();
- spin_unlock_irqrestore(&sn2_global_ptc_lock, flags);
- }
-
-}
-
-EXPORT_SYMBOL(sn_send_IPI_phys);
-
-/**
- * sn2_send_IPI - send an IPI to a processor
- * @cpuid: target of the IPI
- * @vector: command to send
- * @delivery_mode: delivery mechanism
- * @redirect: redirect the IPI?
- *
- * Sends an IPI (InterProcessor Interrupt) to the processor specified by
- * @cpuid. @vector specifies the command to send, while @delivery_mode can
- * be one of the following
- *
- * %IA64_IPI_DM_INT - pend an interrupt
- * %IA64_IPI_DM_PMI - pend a PMI
- * %IA64_IPI_DM_NMI - pend an NMI
- * %IA64_IPI_DM_INIT - pend an INIT interrupt
- */
-void sn2_send_IPI(int cpuid, int vector, int delivery_mode, int redirect)
-{
- long physid;
- int nasid;
-
- physid = cpu_physical_id(cpuid);
- nasid = cpuid_to_nasid(cpuid);
-
- /* the following is used only when starting cpus at boot time */
- if (unlikely(nasid == -1))
- ia64_sn_get_sapic_info(physid, &nasid, NULL, NULL);
-
- sn_send_IPI_phys(nasid, physid, vector, delivery_mode);
-}
-
-#ifdef CONFIG_HOTPLUG_CPU
-/**
- * sn_cpu_disable_allowed - Determine if a CPU can be disabled.
- * @cpu - CPU that is requested to be disabled.
- *
- * CPU disable is only allowed on SHub2 systems running with a PROM
- * that supports CPU disable. It is not permitted to disable the boot processor.
- */
-bool sn_cpu_disable_allowed(int cpu)
-{
- if (is_shub2() && sn_prom_feature_available(PRF_CPU_DISABLE_SUPPORT)) {
- if (cpu != 0)
- return true;
- else
- printk(KERN_WARNING
- "Disabling the boot processor is not allowed.\n");
-
- } else
- printk(KERN_WARNING
- "CPU disable is not supported on this system.\n");
-
- return false;
-}
-#endif /* CONFIG_HOTPLUG_CPU */
-
-#ifdef CONFIG_PROC_FS
-
-#define PTC_BASENAME "sgi_sn/ptc_statistics"
-
-static void *sn2_ptc_seq_start(struct seq_file *file, loff_t * offset)
-{
- if (*offset < nr_cpu_ids)
- return offset;
- return NULL;
-}
-
-static void *sn2_ptc_seq_next(struct seq_file *file, void *data, loff_t * offset)
-{
- (*offset)++;
- if (*offset < nr_cpu_ids)
- return offset;
- return NULL;
-}
-
-static void sn2_ptc_seq_stop(struct seq_file *file, void *data)
-{
-}
-
-static int sn2_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 ptc_l newrid ptc_flushes nodes_flushed deadlocks lock_nsec shub_nsec shub_nsec_max not_my_mm deadlock2 ipi_fluches ipi_nsec\n");
- seq_printf(file, "# ptctest %d, flushopt %d\n", sn2_ptctest, sn2_flush_opt);
- }
-
- if (cpu < nr_cpu_ids && cpu_online(cpu)) {
- stat = &per_cpu(ptcstats, cpu);
- seq_printf(file, "cpu %d %ld %ld %ld %ld %ld %ld %ld %ld %ld %ld %ld %ld\n", cpu, stat->ptc_l,
- stat->change_rid, stat->shub_ptc_flushes, stat->nodes_flushed,
- stat->deadlocks,
- 1000 * stat->lock_itc_clocks / per_cpu(ia64_cpu_info, cpu).cyc_per_usec,
- 1000 * stat->shub_itc_clocks / per_cpu(ia64_cpu_info, cpu).cyc_per_usec,
- 1000 * stat->shub_itc_clocks_max / per_cpu(ia64_cpu_info, cpu).cyc_per_usec,
- stat->shub_ptc_flushes_not_my_mm,
- stat->deadlocks2,
- stat->shub_ipi_flushes,
- 1000 * stat->shub_ipi_flushes_itc_clocks / per_cpu(ia64_cpu_info, cpu).cyc_per_usec);
- }
- return 0;
-}
-
-static ssize_t sn2_ptc_proc_write(struct file *file, const char __user *user, size_t count, loff_t *data)
-{
- int cpu;
- char optstr[64];
-
- if (count == 0 || count > sizeof(optstr))
- return -EINVAL;
- if (copy_from_user(optstr, user, count))
- return -EFAULT;
- optstr[count - 1] = '\0';
- sn2_flush_opt = simple_strtoul(optstr, NULL, 0);
-
- for_each_online_cpu(cpu)
- memset(&per_cpu(ptcstats, cpu), 0, sizeof(struct ptc_stats));
-
- return count;
-}
-
-static const struct seq_operations sn2_ptc_seq_ops = {
- .start = sn2_ptc_seq_start,
- .next = sn2_ptc_seq_next,
- .stop = sn2_ptc_seq_stop,
- .show = sn2_ptc_seq_show
-};
-
-static int sn2_ptc_proc_open(struct inode *inode, struct file *file)
-{
- return seq_open(file, &sn2_ptc_seq_ops);
-}
-
-static const struct file_operations proc_sn2_ptc_operations = {
- .open = sn2_ptc_proc_open,
- .read = seq_read,
- .write = sn2_ptc_proc_write,
- .llseek = seq_lseek,
- .release = seq_release,
-};
-
-static struct proc_dir_entry *proc_sn2_ptc;
-
-static int __init sn2_ptc_init(void)
-{
- if (!ia64_platform_is("sn2"))
- return 0;
-
- proc_sn2_ptc = proc_create(PTC_BASENAME, 0444,
- NULL, &proc_sn2_ptc_operations);
- if (!proc_sn2_ptc) {
- printk(KERN_ERR "unable to create %s proc entry", PTC_BASENAME);
- return -EINVAL;
- }
- spin_lock_init(&sn2_global_ptc_lock);
- return 0;
-}
-
-static void __exit sn2_ptc_exit(void)
-{
- remove_proc_entry(PTC_BASENAME, NULL);
-}
-
-module_init(sn2_ptc_init);
-module_exit(sn2_ptc_exit);
-#endif /* CONFIG_PROC_FS */
-