From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sat, 16 Apr 2005 15:20:36 -0700 Subject: Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip! --- arch/sparc/kernel/sun4d_smp.c | 486 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 486 insertions(+) create mode 100644 arch/sparc/kernel/sun4d_smp.c (limited to 'arch/sparc/kernel/sun4d_smp.c') diff --git a/arch/sparc/kernel/sun4d_smp.c b/arch/sparc/kernel/sun4d_smp.c new file mode 100644 index 000000000000..cc1fc898495c --- /dev/null +++ b/arch/sparc/kernel/sun4d_smp.c @@ -0,0 +1,486 @@ +/* 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 + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define IRQ_CROSS_CALL 15 + +extern ctxd_t *srmmu_ctx_table_phys; + +extern void calibrate_delay(void); + +extern volatile int smp_processors_ready; +extern int smp_num_cpus; +static int smp_highest_cpu; +extern volatile unsigned long cpu_callin_map[NR_CPUS]; +extern struct cpuinfo_sparc cpu_data[NR_CPUS]; +extern unsigned char boot_cpu_id; +extern int smp_activated; +extern volatile int __cpu_number_map[NR_CPUS]; +extern volatile int __cpu_logical_map[NR_CPUS]; +extern volatile unsigned long ipi_count; +extern volatile int smp_process_available; +extern volatile int smp_commenced; +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(!smp_commenced) + 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); +} + +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) +{ + int cpucount = 0; + int i, mid; + + printk("Entering SMP Mode...\n"); + + if (boot_cpu_id) + current_set[0] = NULL; + + local_irq_enable(); + cpus_clear(cpu_present_map); + + /* XXX This whole thing has to go. See sparc64. */ + for (i = 0; !cpu_find_by_instance(i, NULL, &mid); i++) + cpu_set(mid, cpu_present_map); + SMP_PRINTK(("cpu_present_map %08lx\n", cpus_addr(cpu_present_map)[0])); + for(i=0; i < NR_CPUS; i++) + __cpu_number_map[i] = -1; + for(i=0; i < NR_CPUS; i++) + __cpu_logical_map[i] = -1; + __cpu_number_map[boot_cpu_id] = 0; + __cpu_logical_map[0] = boot_cpu_id; + current_thread_info()->cpu = boot_cpu_id; + smp_store_cpu_info(boot_cpu_id); + smp_setup_percpu_timer(); + local_flush_cache_all(); + if (cpu_find_by_instance(1, NULL, NULL)) + return; /* Not an MP box. */ + SMP_PRINTK(("Iterating over CPUs\n")); + for(i = 0; i < NR_CPUS; i++) { + if(i == boot_cpu_id) + continue; + + if (cpu_isset(i, cpu_present_map)) { + extern unsigned long sun4d_cpu_startup; + unsigned long *entry = &sun4d_cpu_startup; + struct task_struct *p; + int timeout; + int no; + + /* Cook up an idler for this guy. */ + p = fork_idle(i); + cpucount++; + current_set[i] = p->thread_info; + for (no = 0; !cpu_find_by_instance(no, NULL, &mid) + && mid != i; no++) ; + + /* + * 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 task %d node %08x\n", i, entry, cpucount, cpu_data(no).prom_node)); + local_flush_cache_all(); + prom_startcpu(cpu_data(no).prom_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]) { + /* Another "Red Snapper". */ + __cpu_number_map[i] = cpucount; + __cpu_logical_map[cpucount] = i; + } else { + cpucount--; + printk("Processor %d is stuck.\n", i); + } + } + if(!(cpu_callin_map[i])) { + cpu_clear(i, cpu_present_map); + __cpu_number_map[i] = -1; + } + } + local_flush_cache_all(); + if(cpucount == 0) { + printk("Error: only one Processor found.\n"); + cpu_present_map = cpumask_of_cpu(hard_smp4d_processor_id()); + } else { + unsigned long bogosum = 0; + + for(i = 0; i < NR_CPUS; i++) { + if (cpu_isset(i, cpu_present_map)) { + bogosum += cpu_data(i).udelay_val; + smp_highest_cpu = i; + } + } + SMP_PRINTK(("Total of %d Processors activated (%lu.%02lu BogoMIPS).\n", cpucount + 1, bogosum/(500000/HZ), (bogosum/(5000/HZ))%100)); + printk("Total of %d Processors activated (%lu.%02lu BogoMIPS).\n", + cpucount + 1, + bogosum/(500000/HZ), + (bogosum/(5000/HZ))%100); + smp_activated = 1; + smp_num_cpus = cpucount + 1; + } + + /* Free unneeded trap tables */ + ClearPageReserved(virt_to_page(trapbase_cpu1)); + set_page_count(virt_to_page(trapbase_cpu1), 1); + free_page((unsigned long)trapbase_cpu1); + totalram_pages++; + num_physpages++; + + ClearPageReserved(virt_to_page(trapbase_cpu2)); + set_page_count(virt_to_page(trapbase_cpu2), 1); + free_page((unsigned long)trapbase_cpu2); + totalram_pages++; + num_physpages++; + + ClearPageReserved(virt_to_page(trapbase_cpu3)); + set_page_count(virt_to_page(trapbase_cpu3), 1); + 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_present_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) +{ + int cpu = hard_smp4d_processor_id(); + static int cpu_tick[NR_CPUS]; + static char led_mask[] = { 0xe, 0xd, 0xb, 0x7, 0xb, 0xd }; + + 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, regs); + + if(!--prof_counter(cpu)) { + int user = user_mode(regs); + + irq_enter(); + update_process_times(user); + irq_exit(); + + prof_counter(cpu) = prof_multiplier(cpu); + } +} + +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; + } +} -- cgit v1.2.3