diff options
Diffstat (limited to 'arch/ia64/kernel/smp.c')
| -rw-r--r-- | arch/ia64/kernel/smp.c | 335 |
1 files changed, 0 insertions, 335 deletions
diff --git a/arch/ia64/kernel/smp.c b/arch/ia64/kernel/smp.c deleted file mode 100644 index ea4f009a232b..000000000000 --- a/arch/ia64/kernel/smp.c +++ /dev/null @@ -1,335 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-only -/* - * SMP Support - * - * Copyright (C) 1999 Walt Drummond <drummond@valinux.com> - * Copyright (C) 1999, 2001, 2003 David Mosberger-Tang <davidm@hpl.hp.com> - * - * Lots of stuff stolen from arch/alpha/kernel/smp.c - * - * 01/05/16 Rohit Seth <rohit.seth@intel.com> IA64-SMP functions. Reorganized - * the existing code (on the lines of x86 port). - * 00/09/11 David Mosberger <davidm@hpl.hp.com> Do loops_per_jiffy - * calibration on each CPU. - * 00/08/23 Asit Mallick <asit.k.mallick@intel.com> fixed logical processor id - * 00/03/31 Rohit Seth <rohit.seth@intel.com> Fixes for Bootstrap Processor - * & cpu_online_map now gets done here (instead of setup.c) - * 99/10/05 davidm Update to bring it in sync with new command-line processing - * scheme. - * 10/13/00 Goutham Rao <goutham.rao@intel.com> Updated smp_call_function and - * smp_call_function_single to resend IPI on timeouts - */ -#include <linux/module.h> -#include <linux/kernel.h> -#include <linux/sched.h> -#include <linux/init.h> -#include <linux/interrupt.h> -#include <linux/smp.h> -#include <linux/kernel_stat.h> -#include <linux/mm.h> -#include <linux/cache.h> -#include <linux/delay.h> -#include <linux/efi.h> -#include <linux/bitops.h> -#include <linux/kexec.h> - -#include <linux/atomic.h> -#include <asm/current.h> -#include <asm/delay.h> -#include <asm/io.h> -#include <asm/irq.h> -#include <asm/page.h> -#include <asm/processor.h> -#include <asm/ptrace.h> -#include <asm/sal.h> -#include <asm/tlbflush.h> -#include <asm/unistd.h> -#include <asm/mca.h> -#include <asm/xtp.h> - -/* - * Note: alignment of 4 entries/cacheline was empirically determined - * to be a good tradeoff between hot cachelines & spreading the array - * across too many cacheline. - */ -static struct local_tlb_flush_counts { - unsigned int count; -} __attribute__((__aligned__(32))) local_tlb_flush_counts[NR_CPUS]; - -static DEFINE_PER_CPU_SHARED_ALIGNED(unsigned short [NR_CPUS], - shadow_flush_counts); - -#define IPI_CALL_FUNC 0 -#define IPI_CPU_STOP 1 -#define IPI_CALL_FUNC_SINGLE 2 -#define IPI_KDUMP_CPU_STOP 3 - -/* This needs to be cacheline aligned because it is written to by *other* CPUs. */ -static DEFINE_PER_CPU_SHARED_ALIGNED(unsigned long, ipi_operation); - -extern void cpu_halt (void); - -static void -stop_this_cpu(void) -{ - /* - * Remove this CPU: - */ - set_cpu_online(smp_processor_id(), false); - max_xtp(); - local_irq_disable(); - cpu_halt(); -} - -void -cpu_die(void) -{ - max_xtp(); - local_irq_disable(); - cpu_halt(); - /* Should never be here */ - BUG(); - for (;;); -} - -irqreturn_t -handle_IPI (int irq, void *dev_id) -{ - int this_cpu = get_cpu(); - unsigned long *pending_ipis = &__ia64_per_cpu_var(ipi_operation); - unsigned long ops; - - mb(); /* Order interrupt and bit testing. */ - while ((ops = xchg(pending_ipis, 0)) != 0) { - mb(); /* Order bit clearing and data access. */ - do { - unsigned long which; - - which = ffz(~ops); - ops &= ~(1 << which); - - switch (which) { - case IPI_CPU_STOP: - stop_this_cpu(); - break; - case IPI_CALL_FUNC: - generic_smp_call_function_interrupt(); - break; - case IPI_CALL_FUNC_SINGLE: - generic_smp_call_function_single_interrupt(); - break; -#ifdef CONFIG_KEXEC - case IPI_KDUMP_CPU_STOP: - unw_init_running(kdump_cpu_freeze, NULL); - break; -#endif - default: - printk(KERN_CRIT "Unknown IPI on CPU %d: %lu\n", - this_cpu, which); - break; - } - } while (ops); - mb(); /* Order data access and bit testing. */ - } - put_cpu(); - return IRQ_HANDLED; -} - - - -/* - * Called with preemption disabled. - */ -static inline void -send_IPI_single (int dest_cpu, int op) -{ - set_bit(op, &per_cpu(ipi_operation, dest_cpu)); - ia64_send_ipi(dest_cpu, IA64_IPI_VECTOR, IA64_IPI_DM_INT, 0); -} - -/* - * Called with preemption disabled. - */ -static inline void -send_IPI_allbutself (int op) -{ - unsigned int i; - - for_each_online_cpu(i) { - if (i != smp_processor_id()) - send_IPI_single(i, op); - } -} - -/* - * Called with preemption disabled. - */ -static inline void -send_IPI_mask(const struct cpumask *mask, int op) -{ - unsigned int cpu; - - for_each_cpu(cpu, mask) { - send_IPI_single(cpu, op); - } -} - -/* - * Called with preemption disabled. - */ -static inline void -send_IPI_all (int op) -{ - int i; - - for_each_online_cpu(i) { - send_IPI_single(i, op); - } -} - -/* - * Called with preemption disabled. - */ -static inline void -send_IPI_self (int op) -{ - send_IPI_single(smp_processor_id(), op); -} - -#ifdef CONFIG_KEXEC -void -kdump_smp_send_stop(void) -{ - send_IPI_allbutself(IPI_KDUMP_CPU_STOP); -} - -void -kdump_smp_send_init(void) -{ - unsigned int cpu, self_cpu; - self_cpu = smp_processor_id(); - for_each_online_cpu(cpu) { - if (cpu != self_cpu) { - if(kdump_status[cpu] == 0) - ia64_send_ipi(cpu, 0, IA64_IPI_DM_INIT, 0); - } - } -} -#endif -/* - * Called with preemption disabled. - */ -void -arch_smp_send_reschedule (int cpu) -{ - ia64_send_ipi(cpu, IA64_IPI_RESCHEDULE, IA64_IPI_DM_INT, 0); -} -EXPORT_SYMBOL_GPL(arch_smp_send_reschedule); - -/* - * Called with preemption disabled. - */ -static void -smp_send_local_flush_tlb (int cpu) -{ - ia64_send_ipi(cpu, IA64_IPI_LOCAL_TLB_FLUSH, IA64_IPI_DM_INT, 0); -} - -void -smp_local_flush_tlb(void) -{ - /* - * Use atomic ops. Otherwise, the load/increment/store sequence from - * a "++" operation can have the line stolen between the load & store. - * The overhead of the atomic op in negligible in this case & offers - * significant benefit for the brief periods where lots of cpus - * are simultaneously flushing TLBs. - */ - ia64_fetchadd(1, &local_tlb_flush_counts[smp_processor_id()].count, acq); - local_flush_tlb_all(); -} - -#define FLUSH_DELAY 5 /* Usec backoff to eliminate excessive cacheline bouncing */ - -void -smp_flush_tlb_cpumask(cpumask_t xcpumask) -{ - unsigned short *counts = __ia64_per_cpu_var(shadow_flush_counts); - cpumask_t cpumask = xcpumask; - int mycpu, cpu, flush_mycpu = 0; - - preempt_disable(); - mycpu = smp_processor_id(); - - for_each_cpu(cpu, &cpumask) - counts[cpu] = local_tlb_flush_counts[cpu].count & 0xffff; - - mb(); - for_each_cpu(cpu, &cpumask) { - if (cpu == mycpu) - flush_mycpu = 1; - else - smp_send_local_flush_tlb(cpu); - } - - if (flush_mycpu) - smp_local_flush_tlb(); - - for_each_cpu(cpu, &cpumask) - while(counts[cpu] == (local_tlb_flush_counts[cpu].count & 0xffff)) - udelay(FLUSH_DELAY); - - preempt_enable(); -} - -void -smp_flush_tlb_all (void) -{ - on_each_cpu((void (*)(void *))local_flush_tlb_all, NULL, 1); -} - -void -smp_flush_tlb_mm (struct mm_struct *mm) -{ - cpumask_var_t cpus; - preempt_disable(); - /* this happens for the common case of a single-threaded fork(): */ - if (likely(mm == current->active_mm && atomic_read(&mm->mm_users) == 1)) - { - local_finish_flush_tlb_mm(mm); - preempt_enable(); - return; - } - if (!alloc_cpumask_var(&cpus, GFP_ATOMIC)) { - smp_call_function((void (*)(void *))local_finish_flush_tlb_mm, - mm, 1); - } else { - cpumask_copy(cpus, mm_cpumask(mm)); - smp_call_function_many(cpus, - (void (*)(void *))local_finish_flush_tlb_mm, mm, 1); - free_cpumask_var(cpus); - } - local_irq_disable(); - local_finish_flush_tlb_mm(mm); - local_irq_enable(); - preempt_enable(); -} - -void arch_send_call_function_single_ipi(int cpu) -{ - send_IPI_single(cpu, IPI_CALL_FUNC_SINGLE); -} - -void arch_send_call_function_ipi_mask(const struct cpumask *mask) -{ - send_IPI_mask(mask, IPI_CALL_FUNC); -} - -/* - * this function calls the 'stop' function on all other CPUs in the system. - */ -void -smp_send_stop (void) -{ - send_IPI_allbutself(IPI_CPU_STOP); -} |