/* sun4d_smp.c: Sparc SS1000/SC2000 SMP support. * * Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) * * Based on sun4m's smp.c, which is: * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu) */ #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/swap.h> #include <linux/profile.h> #include <asm/ptrace.h> #include <asm/atomic.h> #include <asm/irq_regs.h> #include <asm/delay.h> #include <asm/irq.h> #include <asm/page.h> #include <asm/pgalloc.h> #include <asm/pgtable.h> #include <asm/oplib.h> #include <asm/sbus.h> #include <asm/sbi.h> #include <asm/tlbflush.h> #include <asm/cacheflush.h> #include <asm/cpudata.h> #include "irq.h" #define IRQ_CROSS_CALL 15 extern ctxd_t *srmmu_ctx_table_phys; extern void calibrate_delay(void); static volatile int smp_processors_ready = 0; static int smp_highest_cpu; extern volatile unsigned long cpu_callin_map[NR_CPUS]; extern cpuinfo_sparc cpu_data[NR_CPUS]; extern unsigned char boot_cpu_id; extern volatile int smp_process_available; extern cpumask_t smp_commenced_mask; extern int __smp4d_processor_id(void); /* #define SMP_DEBUG */ #ifdef SMP_DEBUG #define SMP_PRINTK(x) printk x #else #define SMP_PRINTK(x) #endif static inline unsigned long swap(volatile unsigned long *ptr, unsigned long val) { __asm__ __volatile__("swap [%1], %0\n\t" : "=&r" (val), "=&r" (ptr) : "0" (val), "1" (ptr)); return val; } static void smp_setup_percpu_timer(void); extern void cpu_probe(void); extern void sun4d_distribute_irqs(void); void __init smp4d_callin(void) { int cpuid = hard_smp4d_processor_id(); extern spinlock_t sun4d_imsk_lock; unsigned long flags; /* Show we are alive */ cpu_leds[cpuid] = 0x6; show_leds(cpuid); /* Enable level15 interrupt, disable level14 interrupt for now */ cc_set_imsk((cc_get_imsk() & ~0x8000) | 0x4000); local_flush_cache_all(); local_flush_tlb_all(); /* * Unblock the master CPU _only_ when the scheduler state * of all secondary CPUs will be up-to-date, so after * the SMP initialization the master will be just allowed * to call the scheduler code. */ /* Get our local ticker going. */ smp_setup_percpu_timer(); calibrate_delay(); smp_store_cpu_info(cpuid); local_flush_cache_all(); local_flush_tlb_all(); /* Allow master to continue. */ swap((unsigned long *)&cpu_callin_map[cpuid], 1); local_flush_cache_all(); local_flush_tlb_all(); cpu_probe(); while((unsigned long)current_set[cpuid] < PAGE_OFFSET) barrier(); while(current_set[cpuid]->cpu != cpuid) barrier(); /* Fix idle thread fields. */ __asm__ __volatile__("ld [%0], %%g6\n\t" : : "r" (¤t_set[cpuid]) : "memory" /* paranoid */); cpu_leds[cpuid] = 0x9; show_leds(cpuid); /* Attach to the address space of init_task. */ atomic_inc(&init_mm.mm_count); current->active_mm = &init_mm; local_flush_cache_all(); local_flush_tlb_all(); local_irq_enable(); /* We don't allow PIL 14 yet */ while (!cpu_isset(cpuid, smp_commenced_mask)) barrier(); spin_lock_irqsave(&sun4d_imsk_lock, flags); cc_set_imsk(cc_get_imsk() & ~0x4000); /* Allow PIL 14 as well */ spin_unlock_irqrestore(&sun4d_imsk_lock, flags); cpu_set(cpuid, cpu_online_map); } extern void init_IRQ(void); extern void cpu_panic(void); /* * Cycle through the processors asking the PROM to start each one. */ extern struct linux_prom_registers smp_penguin_ctable; extern unsigned long trapbase_cpu1[]; extern unsigned long trapbase_cpu2[]; extern unsigned long trapbase_cpu3[]; void __init smp4d_boot_cpus(void) { if (boot_cpu_id) current_set[0] = NULL; smp_setup_percpu_timer(); local_flush_cache_all(); } int __cpuinit smp4d_boot_one_cpu(int i) { extern unsigned long sun4d_cpu_startup; unsigned long *entry = &sun4d_cpu_startup; struct task_struct *p; int timeout; int cpu_node; cpu_find_by_instance(i, &cpu_node,NULL); /* Cook up an idler for this guy. */ p = fork_idle(i); current_set[i] = task_thread_info(p); /* * Initialize the contexts table * Since the call to prom_startcpu() trashes the structure, * we need to re-initialize it for each cpu */ smp_penguin_ctable.which_io = 0; smp_penguin_ctable.phys_addr = (unsigned int) srmmu_ctx_table_phys; smp_penguin_ctable.reg_size = 0; /* whirrr, whirrr, whirrrrrrrrr... */ SMP_PRINTK(("Starting CPU %d at %p \n", i, entry)); local_flush_cache_all(); prom_startcpu(cpu_node, &smp_penguin_ctable, 0, (char *)entry); SMP_PRINTK(("prom_startcpu returned :)\n")); /* wheee... it's going... */ for(timeout = 0; timeout < 10000; timeout++) { if(cpu_callin_map[i]) break; udelay(200); } if (!(cpu_callin_map[i])) { printk("Processor %d is stuck.\n", i); return -ENODEV; } local_flush_cache_all(); return 0; } void __init smp4d_smp_done(void) { int i, first; int *prev; /* setup cpu list for irq rotation */ first = 0; prev = &first; for (i = 0; i < NR_CPUS; i++) if (cpu_online(i)) { *prev = i; prev = &cpu_data(i).next; } *prev = first; local_flush_cache_all(); /* Free unneeded trap tables */ ClearPageReserved(virt_to_page(trapbase_cpu1)); init_page_count(virt_to_page(trapbase_cpu1)); free_page((unsigned long)trapbase_cpu1); totalram_pages++; num_physpages++; ClearPageReserved(virt_to_page(trapbase_cpu2)); init_page_count(virt_to_page(trapbase_cpu2)); free_page((unsigned long)trapbase_cpu2); totalram_pages++; num_physpages++; ClearPageReserved(virt_to_page(trapbase_cpu3)); init_page_count(virt_to_page(trapbase_cpu3)); free_page((unsigned long)trapbase_cpu3); totalram_pages++; num_physpages++; /* Ok, they are spinning and ready to go. */ smp_processors_ready = 1; sun4d_distribute_irqs(); } static struct smp_funcall { smpfunc_t func; unsigned long arg1; unsigned long arg2; unsigned long arg3; unsigned long arg4; unsigned long arg5; unsigned char processors_in[NR_CPUS]; /* Set when ipi entered. */ unsigned char processors_out[NR_CPUS]; /* Set when ipi exited. */ } ccall_info __attribute__((aligned(8))); static DEFINE_SPINLOCK(cross_call_lock); /* Cross calls must be serialized, at least currently. */ void smp4d_cross_call(smpfunc_t func, unsigned long arg1, unsigned long arg2, unsigned long arg3, unsigned long arg4, unsigned long arg5) { if(smp_processors_ready) { register int high = smp_highest_cpu; unsigned long flags; spin_lock_irqsave(&cross_call_lock, flags); { /* If you make changes here, make sure gcc generates proper code... */ register smpfunc_t f asm("i0") = func; register unsigned long a1 asm("i1") = arg1; register unsigned long a2 asm("i2") = arg2; register unsigned long a3 asm("i3") = arg3; register unsigned long a4 asm("i4") = arg4; register unsigned long a5 asm("i5") = arg5; __asm__ __volatile__( "std %0, [%6]\n\t" "std %2, [%6 + 8]\n\t" "std %4, [%6 + 16]\n\t" : : "r"(f), "r"(a1), "r"(a2), "r"(a3), "r"(a4), "r"(a5), "r" (&ccall_info.func)); } /* Init receive/complete mapping, plus fire the IPI's off. */ { cpumask_t mask; register int i; mask = cpumask_of_cpu(hard_smp4d_processor_id()); cpus_andnot(mask, cpu_online_map, mask); for(i = 0; i <= high; i++) { if (cpu_isset(i, mask)) { ccall_info.processors_in[i] = 0; ccall_info.processors_out[i] = 0; sun4d_send_ipi(i, IRQ_CROSS_CALL); } } } { register int i; i = 0; do { while(!ccall_info.processors_in[i]) barrier(); } while(++i <= high); i = 0; do { while(!ccall_info.processors_out[i]) barrier(); } while(++i <= high); } spin_unlock_irqrestore(&cross_call_lock, flags); } } /* Running cross calls. */ void smp4d_cross_call_irq(void) { int i = hard_smp4d_processor_id(); ccall_info.processors_in[i] = 1; ccall_info.func(ccall_info.arg1, ccall_info.arg2, ccall_info.arg3, ccall_info.arg4, ccall_info.arg5); ccall_info.processors_out[i] = 1; } static int smp4d_stop_cpu_sender; static void smp4d_stop_cpu(void) { int me = hard_smp4d_processor_id(); if (me != smp4d_stop_cpu_sender) while(1) barrier(); } /* Cross calls, in order to work efficiently and atomically do all * the message passing work themselves, only stopcpu and reschedule * messages come through here. */ void smp4d_message_pass(int target, int msg, unsigned long data, int wait) { int me = hard_smp4d_processor_id(); SMP_PRINTK(("smp4d_message_pass %d %d %08lx %d\n", target, msg, data, wait)); if (msg == MSG_STOP_CPU && target == MSG_ALL_BUT_SELF) { unsigned long flags; static DEFINE_SPINLOCK(stop_cpu_lock); spin_lock_irqsave(&stop_cpu_lock, flags); smp4d_stop_cpu_sender = me; smp4d_cross_call((smpfunc_t)smp4d_stop_cpu, 0, 0, 0, 0, 0); spin_unlock_irqrestore(&stop_cpu_lock, flags); } printk("Yeeee, trying to send SMP msg(%d) to %d on cpu %d\n", msg, target, me); panic("Bogon SMP message pass."); } void smp4d_percpu_timer_interrupt(struct pt_regs *regs) { struct pt_regs *old_regs; int cpu = hard_smp4d_processor_id(); static int cpu_tick[NR_CPUS]; static char led_mask[] = { 0xe, 0xd, 0xb, 0x7, 0xb, 0xd }; old_regs = set_irq_regs(regs); bw_get_prof_limit(cpu); bw_clear_intr_mask(0, 1); /* INTR_TABLE[0] & 1 is Profile IRQ */ cpu_tick[cpu]++; if (!(cpu_tick[cpu] & 15)) { if (cpu_tick[cpu] == 0x60) cpu_tick[cpu] = 0; cpu_leds[cpu] = led_mask[cpu_tick[cpu] >> 4]; show_leds(cpu); } profile_tick(CPU_PROFILING); if(!--prof_counter(cpu)) { int user = user_mode(regs); irq_enter(); update_process_times(user); irq_exit(); prof_counter(cpu) = prof_multiplier(cpu); } set_irq_regs(old_regs); } extern unsigned int lvl14_resolution; static void __init smp_setup_percpu_timer(void) { int cpu = hard_smp4d_processor_id(); prof_counter(cpu) = prof_multiplier(cpu) = 1; load_profile_irq(cpu, lvl14_resolution); } void __init smp4d_blackbox_id(unsigned *addr) { int rd = *addr & 0x3e000000; addr[0] = 0xc0800800 | rd; /* lda [%g0] ASI_M_VIKING_TMP1, reg */ addr[1] = 0x01000000; /* nop */ addr[2] = 0x01000000; /* nop */ } void __init smp4d_blackbox_current(unsigned *addr) { int rd = *addr & 0x3e000000; addr[0] = 0xc0800800 | rd; /* lda [%g0] ASI_M_VIKING_TMP1, reg */ addr[2] = 0x81282002 | rd | (rd >> 11); /* sll reg, 2, reg */ addr[4] = 0x01000000; /* nop */ } void __init sun4d_init_smp(void) { int i; extern unsigned int t_nmi[], linux_trap_ipi15_sun4d[], linux_trap_ipi15_sun4m[]; /* Patch ipi15 trap table */ t_nmi[1] = t_nmi[1] + (linux_trap_ipi15_sun4d - linux_trap_ipi15_sun4m); /* And set btfixup... */ BTFIXUPSET_BLACKBOX(hard_smp_processor_id, smp4d_blackbox_id); BTFIXUPSET_BLACKBOX(load_current, smp4d_blackbox_current); BTFIXUPSET_CALL(smp_cross_call, smp4d_cross_call, BTFIXUPCALL_NORM); BTFIXUPSET_CALL(smp_message_pass, smp4d_message_pass, BTFIXUPCALL_NORM); BTFIXUPSET_CALL(__hard_smp_processor_id, __smp4d_processor_id, BTFIXUPCALL_NORM); for (i = 0; i < NR_CPUS; i++) { ccall_info.processors_in[i] = 1; ccall_info.processors_out[i] = 1; } }