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   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
  42 extern ctxd_t *srmmu_ctx_table_phys;
  43
  44 static volatile int smp_processors_ready = 0;
  45 static int smp_highest_cpu;
  46 extern volatile unsigned long cpu_callin_map[NR_CPUS];
  47 extern cpuinfo_sparc cpu_data[NR_CPUS];
  48 extern unsigned char boot_cpu_id;
  49 extern volatile int smp_process_available;
  50
  51 extern cpumask_t smp_commenced_mask;
  52
  53 extern 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
  63 static 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
  71 static void smp_setup_percpu_timer(void);
  72 extern void cpu_probe(void);
  73 extern void sun4d_distribute_irqs(void);
  74
  75 void __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
 145 extern void init_IRQ(void);
 146 extern void cpu_panic(void);
 147
 148 /*
 149  *      Cycle through the processors asking the PROM to start each one.
 150  */
 151
 152 extern struct linux_prom_registers smp_penguin_ctable;
 153 extern unsigned long trapbase_cpu1[];
 154 extern unsigned long trapbase_cpu2[];
 155 extern unsigned long trapbase_cpu3[];
 156
 157 void __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
 165 int __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
 211 void __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
 251 static 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
 262 static DEFINE_SPINLOCK(cross_call_lock);
 263
 264 /* Cross calls must be serialized, at least currently. */
 265 static 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. */
 332 void 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
 342 void 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
 375 extern unsigned int lvl14_resolution;
 376
 377 static 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
 385 void __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
 394 void __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
 403 void __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 }