| // SPDX-License-Identifier: GPL-2.0 |
| /* smp.c: Sparc SMP support. |
| * |
| * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu) |
| * Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) |
| * Copyright (C) 2004 Keith M Wesolowski (wesolows@foobazco.org) |
| */ |
| |
| #include <asm/head.h> |
| |
| #include <linux/kernel.h> |
| #include <linux/sched.h> |
| #include <linux/threads.h> |
| #include <linux/smp.h> |
| #include <linux/interrupt.h> |
| #include <linux/kernel_stat.h> |
| #include <linux/init.h> |
| #include <linux/spinlock.h> |
| #include <linux/mm.h> |
| #include <linux/fs.h> |
| #include <linux/seq_file.h> |
| #include <linux/cache.h> |
| #include <linux/delay.h> |
| #include <linux/profile.h> |
| #include <linux/cpu.h> |
| |
| #include <asm/ptrace.h> |
| #include <linux/atomic.h> |
| |
| #include <asm/irq.h> |
| #include <asm/page.h> |
| #include <asm/oplib.h> |
| #include <asm/cacheflush.h> |
| #include <asm/tlbflush.h> |
| #include <asm/cpudata.h> |
| #include <asm/timer.h> |
| #include <asm/leon.h> |
| |
| #include "kernel.h" |
| #include "irq.h" |
| |
| volatile unsigned long cpu_callin_map[NR_CPUS] = {0,}; |
| |
| cpumask_t smp_commenced_mask = CPU_MASK_NONE; |
| |
| const struct sparc32_ipi_ops *sparc32_ipi_ops; |
| |
| /* The only guaranteed locking primitive available on all Sparc |
| * processors is 'ldstub [%reg + immediate], %dest_reg' which atomically |
| * places the current byte at the effective address into dest_reg and |
| * places 0xff there afterwards. Pretty lame locking primitive |
| * compared to the Alpha and the Intel no? Most Sparcs have 'swap' |
| * instruction which is much better... |
| */ |
| |
| void smp_store_cpu_info(int id) |
| { |
| int cpu_node; |
| int mid; |
| |
| cpu_data(id).udelay_val = loops_per_jiffy; |
| |
| cpu_find_by_mid(id, &cpu_node); |
| cpu_data(id).clock_tick = prom_getintdefault(cpu_node, |
| "clock-frequency", 0); |
| cpu_data(id).prom_node = cpu_node; |
| mid = cpu_get_hwmid(cpu_node); |
| |
| if (mid < 0) { |
| printk(KERN_NOTICE "No MID found for CPU%d at node 0x%08x", id, cpu_node); |
| mid = 0; |
| } |
| cpu_data(id).mid = mid; |
| } |
| |
| void __init smp_cpus_done(unsigned int max_cpus) |
| { |
| unsigned long bogosum = 0; |
| int cpu, num = 0; |
| |
| for_each_online_cpu(cpu) { |
| num++; |
| bogosum += cpu_data(cpu).udelay_val; |
| } |
| |
| printk("Total of %d processors activated (%lu.%02lu BogoMIPS).\n", |
| num, bogosum/(500000/HZ), |
| (bogosum/(5000/HZ))%100); |
| |
| switch(sparc_cpu_model) { |
| case sun4m: |
| smp4m_smp_done(); |
| break; |
| case sun4d: |
| smp4d_smp_done(); |
| break; |
| case sparc_leon: |
| leon_smp_done(); |
| break; |
| case sun4e: |
| printk("SUN4E\n"); |
| BUG(); |
| break; |
| case sun4u: |
| printk("SUN4U\n"); |
| BUG(); |
| break; |
| default: |
| printk("UNKNOWN!\n"); |
| BUG(); |
| break; |
| } |
| } |
| |
| void cpu_panic(void) |
| { |
| printk("CPU[%d]: Returns from cpu_idle!\n", smp_processor_id()); |
| panic("SMP bolixed\n"); |
| } |
| |
| struct linux_prom_registers smp_penguin_ctable = { 0 }; |
| |
| void smp_send_reschedule(int cpu) |
| { |
| /* |
| * CPU model dependent way of implementing IPI generation targeting |
| * a single CPU. The trap handler needs only to do trap entry/return |
| * to call schedule. |
| */ |
| sparc32_ipi_ops->resched(cpu); |
| } |
| |
| void smp_send_stop(void) |
| { |
| } |
| |
| void arch_send_call_function_single_ipi(int cpu) |
| { |
| /* trigger one IPI single call on one CPU */ |
| sparc32_ipi_ops->single(cpu); |
| } |
| |
| void arch_send_call_function_ipi_mask(const struct cpumask *mask) |
| { |
| int cpu; |
| |
| /* trigger IPI mask call on each CPU */ |
| for_each_cpu(cpu, mask) |
| sparc32_ipi_ops->mask_one(cpu); |
| } |
| |
| void smp_resched_interrupt(void) |
| { |
| irq_enter(); |
| scheduler_ipi(); |
| local_cpu_data().irq_resched_count++; |
| irq_exit(); |
| /* re-schedule routine called by interrupt return code. */ |
| } |
| |
| void smp_call_function_single_interrupt(void) |
| { |
| irq_enter(); |
| generic_smp_call_function_single_interrupt(); |
| local_cpu_data().irq_call_count++; |
| irq_exit(); |
| } |
| |
| void smp_call_function_interrupt(void) |
| { |
| irq_enter(); |
| generic_smp_call_function_interrupt(); |
| local_cpu_data().irq_call_count++; |
| irq_exit(); |
| } |
| |
| int setup_profiling_timer(unsigned int multiplier) |
| { |
| return -EINVAL; |
| } |
| |
| void __init smp_prepare_cpus(unsigned int max_cpus) |
| { |
| int i, cpuid, extra; |
| |
| printk("Entering SMP Mode...\n"); |
| |
| extra = 0; |
| for (i = 0; !cpu_find_by_instance(i, NULL, &cpuid); i++) { |
| if (cpuid >= NR_CPUS) |
| extra++; |
| } |
| /* i = number of cpus */ |
| if (extra && max_cpus > i - extra) |
| printk("Warning: NR_CPUS is too low to start all cpus\n"); |
| |
| smp_store_cpu_info(boot_cpu_id); |
| |
| switch(sparc_cpu_model) { |
| case sun4m: |
| smp4m_boot_cpus(); |
| break; |
| case sun4d: |
| smp4d_boot_cpus(); |
| break; |
| case sparc_leon: |
| leon_boot_cpus(); |
| break; |
| case sun4e: |
| printk("SUN4E\n"); |
| BUG(); |
| break; |
| case sun4u: |
| printk("SUN4U\n"); |
| BUG(); |
| break; |
| default: |
| printk("UNKNOWN!\n"); |
| BUG(); |
| break; |
| } |
| } |
| |
| /* Set this up early so that things like the scheduler can init |
| * properly. We use the same cpu mask for both the present and |
| * possible cpu map. |
| */ |
| void __init smp_setup_cpu_possible_map(void) |
| { |
| int instance, mid; |
| |
| instance = 0; |
| while (!cpu_find_by_instance(instance, NULL, &mid)) { |
| if (mid < NR_CPUS) { |
| set_cpu_possible(mid, true); |
| set_cpu_present(mid, true); |
| } |
| instance++; |
| } |
| } |
| |
| void __init smp_prepare_boot_cpu(void) |
| { |
| int cpuid = hard_smp_processor_id(); |
| |
| if (cpuid >= NR_CPUS) { |
| prom_printf("Serious problem, boot cpu id >= NR_CPUS\n"); |
| prom_halt(); |
| } |
| if (cpuid != 0) |
| printk("boot cpu id != 0, this could work but is untested\n"); |
| |
| current_thread_info()->cpu = cpuid; |
| set_cpu_online(cpuid, true); |
| set_cpu_possible(cpuid, true); |
| } |
| |
| int __cpu_up(unsigned int cpu, struct task_struct *tidle) |
| { |
| int ret=0; |
| |
| switch(sparc_cpu_model) { |
| case sun4m: |
| ret = smp4m_boot_one_cpu(cpu, tidle); |
| break; |
| case sun4d: |
| ret = smp4d_boot_one_cpu(cpu, tidle); |
| break; |
| case sparc_leon: |
| ret = leon_boot_one_cpu(cpu, tidle); |
| break; |
| case sun4e: |
| printk("SUN4E\n"); |
| BUG(); |
| break; |
| case sun4u: |
| printk("SUN4U\n"); |
| BUG(); |
| break; |
| default: |
| printk("UNKNOWN!\n"); |
| BUG(); |
| break; |
| } |
| |
| if (!ret) { |
| cpumask_set_cpu(cpu, &smp_commenced_mask); |
| while (!cpu_online(cpu)) |
| mb(); |
| } |
| return ret; |
| } |
| |
| static void arch_cpu_pre_starting(void *arg) |
| { |
| local_ops->cache_all(); |
| local_ops->tlb_all(); |
| |
| switch(sparc_cpu_model) { |
| case sun4m: |
| sun4m_cpu_pre_starting(arg); |
| break; |
| case sun4d: |
| sun4d_cpu_pre_starting(arg); |
| break; |
| case sparc_leon: |
| leon_cpu_pre_starting(arg); |
| break; |
| default: |
| BUG(); |
| } |
| } |
| |
| static void arch_cpu_pre_online(void *arg) |
| { |
| unsigned int cpuid = hard_smp_processor_id(); |
| |
| register_percpu_ce(cpuid); |
| |
| calibrate_delay(); |
| smp_store_cpu_info(cpuid); |
| |
| local_ops->cache_all(); |
| local_ops->tlb_all(); |
| |
| switch(sparc_cpu_model) { |
| case sun4m: |
| sun4m_cpu_pre_online(arg); |
| break; |
| case sun4d: |
| sun4d_cpu_pre_online(arg); |
| break; |
| case sparc_leon: |
| leon_cpu_pre_online(arg); |
| break; |
| default: |
| BUG(); |
| } |
| } |
| |
| static void sparc_start_secondary(void *arg) |
| { |
| unsigned int cpu; |
| |
| /* |
| * SMP booting is extremely fragile in some architectures. So run |
| * the cpu initialization code first before anything else. |
| */ |
| arch_cpu_pre_starting(arg); |
| |
| cpu = smp_processor_id(); |
| |
| notify_cpu_starting(cpu); |
| arch_cpu_pre_online(arg); |
| |
| /* Set the CPU in the cpu_online_mask */ |
| set_cpu_online(cpu, true); |
| |
| /* Enable local interrupts now */ |
| local_irq_enable(); |
| |
| wmb(); |
| cpu_startup_entry(CPUHP_AP_ONLINE_IDLE); |
| |
| /* We should never reach here! */ |
| BUG(); |
| } |
| |
| void smp_callin(void) |
| { |
| sparc_start_secondary(NULL); |
| } |
| |
| void smp_bogo(struct seq_file *m) |
| { |
| int i; |
| |
| for_each_online_cpu(i) { |
| seq_printf(m, |
| "Cpu%dBogo\t: %lu.%02lu\n", |
| i, |
| cpu_data(i).udelay_val/(500000/HZ), |
| (cpu_data(i).udelay_val/(5000/HZ))%100); |
| } |
| } |
| |
| void smp_info(struct seq_file *m) |
| { |
| int i; |
| |
| seq_printf(m, "State:\n"); |
| for_each_online_cpu(i) |
| seq_printf(m, "CPU%d\t\t: online\n", i); |
| } |