diff options
Diffstat (limited to 'arch/ia64/sn/kernel/sn2/sn2_smp.c')
| -rw-r--r-- | arch/ia64/sn/kernel/sn2/sn2_smp.c | 577 |
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 */ - |