linux/arch/sparc/kernel/sun4d_smp.c
<<
>>
Prefs
   1/* sun4d_smp.c: Sparc SS1000/SC2000 SMP support.
   2 *
   3 * Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
   4 *
   5 * Based on sun4m's smp.c, which is:
   6 * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
   7 */
   8
   9#include <asm/head.h>
  10
  11#include <linux/kernel.h>
  12#include <linux/sched.h>
  13#include <linux/threads.h>
  14#include <linux/smp.h>
  15#include <linux/interrupt.h>
  16#include <linux/kernel_stat.h>
  17#include <linux/init.h>
  18#include <linux/spinlock.h>
  19#include <linux/mm.h>
  20#include <linux/swap.h>
  21#include <linux/profile.h>
  22#include <linux/delay.h>
  23
  24#include <asm/ptrace.h>
  25#include <asm/atomic.h>
  26#include <asm/irq_regs.h>
  27
  28#include <asm/irq.h>
  29#include <asm/page.h>
  30#include <asm/pgalloc.h>
  31#include <asm/pgtable.h>
  32#include <asm/oplib.h>
  33#include <asm/sbus.h>
  34#include <asm/sbi.h>
  35#include <asm/tlbflush.h>
  36#include <asm/cacheflush.h>
  37#include <asm/cpudata.h>
  38
  39#include "irq.h"
  40#define IRQ_CROSS_CALL          15
  41
  42extern ctxd_t *srmmu_ctx_table_phys;
  43
  44static volatile int smp_processors_ready = 0;
  45static int smp_highest_cpu;
  46extern volatile unsigned long cpu_callin_map[NR_CPUS];
  47extern cpuinfo_sparc cpu_data[NR_CPUS];
  48extern unsigned char boot_cpu_id;
  49extern volatile int smp_process_available;
  50
  51extern cpumask_t smp_commenced_mask;
  52
  53extern int __smp4d_processor_id(void);
  54
  55/* #define SMP_DEBUG */
  56
  57#ifdef SMP_DEBUG
  58#define SMP_PRINTK(x)   printk x
  59#else
  60#define SMP_PRINTK(x)
  61#endif
  62
  63static inline unsigned long swap(volatile unsigned long *ptr, unsigned long val)
  64{
  65        __asm__ __volatile__("swap [%1], %0\n\t" :
  66                             "=&r" (val), "=&r" (ptr) :
  67                             "0" (val), "1" (ptr));
  68        return val;
  69}
  70
  71static void smp_setup_percpu_timer(void);
  72extern void cpu_probe(void);
  73extern void sun4d_distribute_irqs(void);
  74
  75void __init smp4d_callin(void)
  76{
  77        int cpuid = hard_smp4d_processor_id();
  78        extern spinlock_t sun4d_imsk_lock;
  79        unsigned long flags;
  80        
  81        /* Show we are alive */
  82        cpu_leds[cpuid] = 0x6;
  83        show_leds(cpuid);
  84
  85        /* Enable level15 interrupt, disable level14 interrupt for now */
  86        cc_set_imsk((cc_get_imsk() & ~0x8000) | 0x4000);
  87
  88        local_flush_cache_all();
  89        local_flush_tlb_all();
  90
  91        /*
  92         * Unblock the master CPU _only_ when the scheduler state
  93         * of all secondary CPUs will be up-to-date, so after
  94         * the SMP initialization the master will be just allowed
  95         * to call the scheduler code.
  96         */
  97        /* Get our local ticker going. */
  98        smp_setup_percpu_timer();
  99
 100        calibrate_delay();
 101        smp_store_cpu_info(cpuid);
 102        local_flush_cache_all();
 103        local_flush_tlb_all();
 104
 105        /* Allow master to continue. */
 106        swap((unsigned long *)&cpu_callin_map[cpuid], 1);
 107        local_flush_cache_all();
 108        local_flush_tlb_all();
 109        
 110        cpu_probe();
 111
 112        while((unsigned long)current_set[cpuid] < PAGE_OFFSET)
 113                barrier();
 114                
 115        while(current_set[cpuid]->cpu != cpuid)
 116                barrier();
 117                
 118        /* Fix idle thread fields. */
 119        __asm__ __volatile__("ld [%0], %%g6\n\t"
 120                             : : "r" (&current_set[cpuid])
 121                             : "memory" /* paranoid */);
 122
 123        cpu_leds[cpuid] = 0x9;
 124        show_leds(cpuid);
 125        
 126        /* Attach to the address space of init_task. */
 127        atomic_inc(&init_mm.mm_count);
 128        current->active_mm = &init_mm;
 129
 130        local_flush_cache_all();
 131        local_flush_tlb_all();
 132        
 133        local_irq_enable();     /* We don't allow PIL 14 yet */
 134        
 135        while (!cpu_isset(cpuid, smp_commenced_mask))
 136                barrier();
 137
 138        spin_lock_irqsave(&sun4d_imsk_lock, flags);
 139        cc_set_imsk(cc_get_imsk() & ~0x4000); /* Allow PIL 14 as well */
 140        spin_unlock_irqrestore(&sun4d_imsk_lock, flags);
 141        cpu_set(cpuid, cpu_online_map);
 142
 143}
 144
 145extern void init_IRQ(void);
 146extern void cpu_panic(void);
 147
 148/*
 149 *      Cycle through the processors asking the PROM to start each one.
 150 */
 151 
 152extern struct linux_prom_registers smp_penguin_ctable;
 153extern unsigned long trapbase_cpu1[];
 154extern unsigned long trapbase_cpu2[];
 155extern unsigned long trapbase_cpu3[];
 156
 157void __init smp4d_boot_cpus(void)
 158{
 159        if (boot_cpu_id)
 160                current_set[0] = NULL;
 161        smp_setup_percpu_timer();
 162        local_flush_cache_all();
 163}
 164
 165int __cpuinit smp4d_boot_one_cpu(int i)
 166{
 167                        extern unsigned long sun4d_cpu_startup;
 168                        unsigned long *entry = &sun4d_cpu_startup;
 169                        struct task_struct *p;
 170                        int timeout;
 171                        int cpu_node;
 172
 173                        cpu_find_by_instance(i, &cpu_node,NULL);
 174                        /* Cook up an idler for this guy. */
 175                        p = fork_idle(i);
 176                        current_set[i] = task_thread_info(p);
 177
 178                        /*
 179                         * Initialize the contexts table
 180                         * Since the call to prom_startcpu() trashes the structure,
 181                         * we need to re-initialize it for each cpu
 182                         */
 183                        smp_penguin_ctable.which_io = 0;
 184                        smp_penguin_ctable.phys_addr = (unsigned int) srmmu_ctx_table_phys;
 185                        smp_penguin_ctable.reg_size = 0;
 186
 187                        /* whirrr, whirrr, whirrrrrrrrr... */
 188                        SMP_PRINTK(("Starting CPU %d at %p \n", i, entry));
 189                        local_flush_cache_all();
 190                        prom_startcpu(cpu_node,
 191                                      &smp_penguin_ctable, 0, (char *)entry);
 192                                      
 193                        SMP_PRINTK(("prom_startcpu returned :)\n"));
 194
 195                        /* wheee... it's going... */
 196                        for(timeout = 0; timeout < 10000; timeout++) {
 197                                if(cpu_callin_map[i])
 198                                        break;
 199                                udelay(200);
 200                        }
 201                        
 202        if (!(cpu_callin_map[i])) {
 203                printk("Processor %d is stuck.\n", i);
 204                return -ENODEV;
 205
 206        }
 207        local_flush_cache_all();
 208        return 0;
 209}
 210
 211void __init smp4d_smp_done(void)
 212{
 213        int i, first;
 214        int *prev;
 215
 216        /* setup cpu list for irq rotation */
 217        first = 0;
 218        prev = &first;
 219        for (i = 0; i < NR_CPUS; i++)
 220                if (cpu_online(i)) {
 221                        *prev = i;
 222                        prev = &cpu_data(i).next;
 223                }
 224        *prev = first;
 225        local_flush_cache_all();
 226
 227        /* Free unneeded trap tables */
 228        ClearPageReserved(virt_to_page(trapbase_cpu1));
 229        init_page_count(virt_to_page(trapbase_cpu1));
 230        free_page((unsigned long)trapbase_cpu1);
 231        totalram_pages++;
 232        num_physpages++;
 233
 234        ClearPageReserved(virt_to_page(trapbase_cpu2));
 235        init_page_count(virt_to_page(trapbase_cpu2));
 236        free_page((unsigned long)trapbase_cpu2);
 237        totalram_pages++;
 238        num_physpages++;
 239
 240        ClearPageReserved(virt_to_page(trapbase_cpu3));
 241        init_page_count(virt_to_page(trapbase_cpu3));
 242        free_page((unsigned long)trapbase_cpu3);
 243        totalram_pages++;
 244        num_physpages++;
 245
 246        /* Ok, they are spinning and ready to go. */
 247        smp_processors_ready = 1;
 248        sun4d_distribute_irqs();
 249}
 250
 251static struct smp_funcall {
 252        smpfunc_t func;
 253        unsigned long arg1;
 254        unsigned long arg2;
 255        unsigned long arg3;
 256        unsigned long arg4;
 257        unsigned long arg5;
 258        unsigned char processors_in[NR_CPUS];  /* Set when ipi entered. */
 259        unsigned char processors_out[NR_CPUS]; /* Set when ipi exited. */
 260} ccall_info __attribute__((aligned(8)));
 261
 262static DEFINE_SPINLOCK(cross_call_lock);
 263
 264/* Cross calls must be serialized, at least currently. */
 265static void smp4d_cross_call(smpfunc_t func, cpumask_t mask, unsigned long arg1,
 266                             unsigned long arg2, unsigned long arg3,
 267                             unsigned long arg4)
 268{
 269        if(smp_processors_ready) {
 270                register int high = smp_highest_cpu;
 271                unsigned long flags;
 272
 273                spin_lock_irqsave(&cross_call_lock, flags);
 274
 275                {
 276                        /* If you make changes here, make sure gcc generates proper code... */
 277                        register smpfunc_t f asm("i0") = func;
 278                        register unsigned long a1 asm("i1") = arg1;
 279                        register unsigned long a2 asm("i2") = arg2;
 280                        register unsigned long a3 asm("i3") = arg3;
 281                        register unsigned long a4 asm("i4") = arg4;
 282                        register unsigned long a5 asm("i5") = 0;
 283
 284                        __asm__ __volatile__(
 285                                "std %0, [%6]\n\t"
 286                                "std %2, [%6 + 8]\n\t"
 287                                "std %4, [%6 + 16]\n\t" : :
 288                                "r"(f), "r"(a1), "r"(a2), "r"(a3), "r"(a4), "r"(a5),
 289                                "r" (&ccall_info.func));
 290                }
 291
 292                /* Init receive/complete mapping, plus fire the IPI's off. */
 293                {
 294                        register int i;
 295
 296                        cpu_clear(smp_processor_id(), mask);
 297                        cpus_and(mask, cpu_online_map, mask);
 298                        for(i = 0; i <= high; i++) {
 299                                if (cpu_isset(i, mask)) {
 300                                        ccall_info.processors_in[i] = 0;
 301                                        ccall_info.processors_out[i] = 0;
 302                                        sun4d_send_ipi(i, IRQ_CROSS_CALL);
 303                                }
 304                        }
 305                }
 306
 307                {
 308                        register int i;
 309
 310                        i = 0;
 311                        do {
 312                                if (!cpu_isset(i, mask))
 313                                        continue;
 314                                while(!ccall_info.processors_in[i])
 315                                        barrier();
 316                        } while(++i <= high);
 317
 318                        i = 0;
 319                        do {
 320                                if (!cpu_isset(i, mask))
 321                                        continue;
 322                                while(!ccall_info.processors_out[i])
 323                                        barrier();
 324                        } while(++i <= high);
 325                }
 326
 327                spin_unlock_irqrestore(&cross_call_lock, flags);
 328        }
 329}
 330
 331/* Running cross calls. */
 332void smp4d_cross_call_irq(void)
 333{
 334        int i = hard_smp4d_processor_id();
 335
 336        ccall_info.processors_in[i] = 1;
 337        ccall_info.func(ccall_info.arg1, ccall_info.arg2, ccall_info.arg3,
 338                        ccall_info.arg4, ccall_info.arg5);
 339        ccall_info.processors_out[i] = 1;
 340}
 341
 342void smp4d_percpu_timer_interrupt(struct pt_regs *regs)
 343{
 344        struct pt_regs *old_regs;
 345        int cpu = hard_smp4d_processor_id();
 346        static int cpu_tick[NR_CPUS];
 347        static char led_mask[] = { 0xe, 0xd, 0xb, 0x7, 0xb, 0xd };
 348
 349        old_regs = set_irq_regs(regs);
 350        bw_get_prof_limit(cpu); 
 351        bw_clear_intr_mask(0, 1);       /* INTR_TABLE[0] & 1 is Profile IRQ */
 352
 353        cpu_tick[cpu]++;
 354        if (!(cpu_tick[cpu] & 15)) {
 355                if (cpu_tick[cpu] == 0x60)
 356                        cpu_tick[cpu] = 0;
 357                cpu_leds[cpu] = led_mask[cpu_tick[cpu] >> 4];
 358                show_leds(cpu);
 359        }
 360
 361        profile_tick(CPU_PROFILING);
 362
 363        if(!--prof_counter(cpu)) {
 364                int user = user_mode(regs);
 365
 366                irq_enter();
 367                update_process_times(user);
 368                irq_exit();
 369
 370                prof_counter(cpu) = prof_multiplier(cpu);
 371        }
 372        set_irq_regs(old_regs);
 373}
 374
 375extern unsigned int lvl14_resolution;
 376
 377static void __init smp_setup_percpu_timer(void)
 378{
 379        int cpu = hard_smp4d_processor_id();
 380
 381        prof_counter(cpu) = prof_multiplier(cpu) = 1;
 382        load_profile_irq(cpu, lvl14_resolution);
 383}
 384
 385void __init smp4d_blackbox_id(unsigned *addr)
 386{
 387        int rd = *addr & 0x3e000000;
 388        
 389        addr[0] = 0xc0800800 | rd;              /* lda [%g0] ASI_M_VIKING_TMP1, reg */
 390        addr[1] = 0x01000000;                   /* nop */
 391        addr[2] = 0x01000000;                   /* nop */
 392}
 393
 394void __init smp4d_blackbox_current(unsigned *addr)
 395{
 396        int rd = *addr & 0x3e000000;
 397        
 398        addr[0] = 0xc0800800 | rd;              /* lda [%g0] ASI_M_VIKING_TMP1, reg */
 399        addr[2] = 0x81282002 | rd | (rd >> 11); /* sll reg, 2, reg */
 400        addr[4] = 0x01000000;                   /* nop */
 401}
 402
 403void __init sun4d_init_smp(void)
 404{
 405        int i;
 406        extern unsigned int t_nmi[], linux_trap_ipi15_sun4d[], linux_trap_ipi15_sun4m[];
 407
 408        /* Patch ipi15 trap table */
 409        t_nmi[1] = t_nmi[1] + (linux_trap_ipi15_sun4d - linux_trap_ipi15_sun4m);
 410        
 411        /* And set btfixup... */
 412        BTFIXUPSET_BLACKBOX(hard_smp_processor_id, smp4d_blackbox_id);
 413        BTFIXUPSET_BLACKBOX(load_current, smp4d_blackbox_current);
 414        BTFIXUPSET_CALL(smp_cross_call, smp4d_cross_call, BTFIXUPCALL_NORM);
 415        BTFIXUPSET_CALL(__hard_smp_processor_id, __smp4d_processor_id, BTFIXUPCALL_NORM);
 416        
 417        for (i = 0; i < NR_CPUS; i++) {
 418                ccall_info.processors_in[i] = 1;
 419                ccall_info.processors_out[i] = 1;
 420        }
 421}
 422