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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/smp_lock.h>
  16 #include <linux/interrupt.h>
  17 #include <linux/kernel_stat.h>
  18 #include <linux/init.h>
  19 #include <linux/spinlock.h>
  20 #include <linux/mm.h>
  21 #include <linux/swap.h>
  22 #include <linux/profile.h>
  23
  24 #include <asm/ptrace.h>
  25 #include <asm/atomic.h>
  26 #include <asm/irq_regs.h>
  27
  28 #include <asm/delay.h>
  29 #include <asm/irq.h>
  30 #include <asm/page.h>
  31 #include <asm/pgalloc.h>
  32 #include <asm/pgtable.h>
  33 #include <asm/oplib.h>
  34 #include <asm/sbus.h>
  35 #include <asm/sbi.h>
  36 #include <asm/tlbflush.h>
  37 #include <asm/cacheflush.h>
  38 #include <asm/cpudata.h>
  39
  40 #define IRQ_CROSS_CALL          15
  41
  42 extern ctxd_t *srmmu_ctx_table_phys;
  43
  44 extern void calibrate_delay(void);
  45
  46 static volatile int smp_processors_ready = 0;
  47 static int smp_highest_cpu;
  48 extern volatile unsigned long cpu_callin_map[NR_CPUS];
  49 extern cpuinfo_sparc cpu_data[NR_CPUS];
  50 extern unsigned char boot_cpu_id;
  51 extern volatile int smp_process_available;
  52
  53 extern cpumask_t smp_commenced_mask;
  54
  55 extern int __smp4d_processor_id(void);
  56
  57 /* #define SMP_DEBUG */
  58
  59 #ifdef SMP_DEBUG
  60 #define SMP_PRINTK(x)   printk x
  61 #else
  62 #define SMP_PRINTK(x)
  63 #endif
  64
  65 static inline unsigned long swap(volatile unsigned long *ptr, unsigned long val)
  66 {
  67         __asm__ __volatile__("swap [%1], %0\n\t" :
  68                              "=&r" (val), "=&r" (ptr) :
  69                              "0" (val), "1" (ptr));
  70         return val;
  71 }
  72
  73 static void smp_setup_percpu_timer(void);
  74 extern void cpu_probe(void);
  75 extern void sun4d_distribute_irqs(void);
  76
  77 void __init smp4d_callin(void)
  78 {
  79         int cpuid = hard_smp4d_processor_id();
  80         extern spinlock_t sun4d_imsk_lock;
  81         unsigned long flags;
  82
  83         /* Show we are alive */
  84         cpu_leds[cpuid] = 0x6;
  85         show_leds(cpuid);
  86
  87         /* Enable level15 interrupt, disable level14 interrupt for now */
  88         cc_set_imsk((cc_get_imsk() & ~0x8000) | 0x4000);
  89
  90         local_flush_cache_all();
  91         local_flush_tlb_all();
  92
  93         /*
  94          * Unblock the master CPU _only_ when the scheduler state
  95          * of all secondary CPUs will be up-to-date, so after
  96          * the SMP initialization the master will be just allowed
  97          * to call the scheduler code.
  98          */
  99         /* Get our local ticker going. */
 100         smp_setup_percpu_timer();
 101
 102         calibrate_delay();
 103         smp_store_cpu_info(cpuid);
 104         local_flush_cache_all();
 105         local_flush_tlb_all();
 106
 107         /* Allow master to continue. */
 108         swap((unsigned long *)&cpu_callin_map[cpuid], 1);
 109         local_flush_cache_all();
 110         local_flush_tlb_all();
 111
 112         cpu_probe();
 113
 114         while((unsigned long)current_set[cpuid] < PAGE_OFFSET)
 115                 barrier();
 116
 117         while(current_set[cpuid]->cpu != cpuid)
 118                 barrier();
 119
 120         /* Fix idle thread fields. */
 121         __asm__ __volatile__("ld [%0], %%g6\n\t"
 122                              : : "r" (&current_set[cpuid])
 123                              : "memory" /* paranoid */);
 124
 125         cpu_leds[cpuid] = 0x9;
 126         show_leds(cpuid);
 127
 128         /* Attach to the address space of init_task. */
 129         atomic_inc(&init_mm.mm_count);
 130         current->active_mm = &init_mm;
 131
 132         local_flush_cache_all();
 133         local_flush_tlb_all();
 134
 135         local_irq_enable();     /* We don't allow PIL 14 yet */
 136
 137         while (!cpu_isset(cpuid, smp_commenced_mask))
 138                 barrier();
 139
 140         spin_lock_irqsave(&sun4d_imsk_lock, flags);
 141         cc_set_imsk(cc_get_imsk() & ~0x4000); /* Allow PIL 14 as well */
 142         spin_unlock_irqrestore(&sun4d_imsk_lock, flags);
 143         cpu_set(cpuid, cpu_online_map);
 144
 145 }
 146
 147 extern void init_IRQ(void);
 148 extern void cpu_panic(void);
 149
 150 /*
 151  *      Cycle through the processors asking the PROM to start each one.
 152  */
 153
 154 extern struct linux_prom_registers smp_penguin_ctable;
 155 extern unsigned long trapbase_cpu1[];
 156 extern unsigned long trapbase_cpu2[];
 157 extern unsigned long trapbase_cpu3[];
 158
 159 void __init smp4d_boot_cpus(void)
 160 {
 161         if (boot_cpu_id)
 162                 current_set[0] = NULL;
 163         smp_setup_percpu_timer();
 164         local_flush_cache_all();
 165 }
 166
 167 int __cpuinit smp4d_boot_one_cpu(int i)
 168 {
 169                         extern unsigned long sun4d_cpu_startup;
 170                         unsigned long *entry = &sun4d_cpu_startup;
 171                         struct task_struct *p;
 172                         int timeout;
 173                         int cpu_node;
 174
 175                         cpu_find_by_instance(i, &cpu_node,NULL);
 176                         /* Cook up an idler for this guy. */
 177                         p = fork_idle(i);
 178                         current_set[i] = task_thread_info(p);
 179
 180                         /*
 181                          * Initialize the contexts table
 182                          * Since the call to prom_startcpu() trashes the structure,
 183                          * we need to re-initialize it for each cpu
 184                          */
 185                         smp_penguin_ctable.which_io = 0;
 186                         smp_penguin_ctable.phys_addr = (unsigned int) srmmu_ctx_table_phys;
 187                         smp_penguin_ctable.reg_size = 0;
 188
 189                         /* whirrr, whirrr, whirrrrrrrrr... */
 190                         SMP_PRINTK(("Starting CPU %d at %p \n", i, entry));
 191                         local_flush_cache_all();
 192                         prom_startcpu(cpu_node,
 193                                       &smp_penguin_ctable, 0, (char *)entry);
 194
 195                         SMP_PRINTK(("prom_startcpu returned :)\n"));
 196
 197                         /* wheee... it's going... */
 198                         for(timeout = 0; timeout < 10000; timeout++) {
 199                                 if(cpu_callin_map[i])
 200                                         break;
 201                                 udelay(200);
 202                         }
 203
 204         if (!(cpu_callin_map[i])) {
 205                 printk("Processor %d is stuck.\n", i);
 206                 return -ENODEV;
 207
 208         }
 209         local_flush_cache_all();
 210         return 0;
 211 }
 212
 213 void __init smp4d_smp_done(void)
 214 {
 215         int i, first;
 216         int *prev;
 217
 218         /* setup cpu list for irq rotation */
 219         first = 0;
 220         prev = &first;
 221         for (i = 0; i < NR_CPUS; i++)
 222                 if (cpu_online(i)) {
 223                         *prev = i;
 224                         prev = &cpu_data(i).next;
 225                 }
 226         *prev = first;
 227         local_flush_cache_all();
 228
 229         /* Free unneeded trap tables */
 230         ClearPageReserved(virt_to_page(trapbase_cpu1));
 231         init_page_count(virt_to_page(trapbase_cpu1));
 232         free_page((unsigned long)trapbase_cpu1);
 233         totalram_pages++;
 234         num_physpages++;
 235
 236         ClearPageReserved(virt_to_page(trapbase_cpu2));
 237         init_page_count(virt_to_page(trapbase_cpu2));
 238         free_page((unsigned long)trapbase_cpu2);
 239         totalram_pages++;
 240         num_physpages++;
 241
 242         ClearPageReserved(virt_to_page(trapbase_cpu3));
 243         init_page_count(virt_to_page(trapbase_cpu3));
 244         free_page((unsigned long)trapbase_cpu3);
 245         totalram_pages++;
 246         num_physpages++;
 247
 248         /* Ok, they are spinning and ready to go. */
 249         smp_processors_ready = 1;
 250         sun4d_distribute_irqs();
 251 }
 252
 253 static struct smp_funcall {
 254         smpfunc_t func;
 255         unsigned long arg1;
 256         unsigned long arg2;
 257         unsigned long arg3;
 258         unsigned long arg4;
 259         unsigned long arg5;
 260         unsigned char processors_in[NR_CPUS];  /* Set when ipi entered. */
 261         unsigned char processors_out[NR_CPUS]; /* Set when ipi exited. */
 262 } ccall_info __attribute__((aligned(8)));
 263
 264 static DEFINE_SPINLOCK(cross_call_lock);
 265
 266 /* Cross calls must be serialized, at least currently. */
 267 void smp4d_cross_call(smpfunc_t func, unsigned long arg1, unsigned long arg2,
 268                     unsigned long arg3, unsigned long arg4, unsigned long arg5)
 269 {
 270         if(smp_processors_ready) {
 271                 register int high = smp_highest_cpu;
 272                 unsigned long flags;
 273
 274                 spin_lock_irqsave(&cross_call_lock, flags);
 275
 276                 {
 277                         /* If you make changes here, make sure gcc generates proper code... */
 278                         register smpfunc_t f asm("i0") = func;
 279                         register unsigned long a1 asm("i1") = arg1;
 280                         register unsigned long a2 asm("i2") = arg2;
 281                         register unsigned long a3 asm("i3") = arg3;
 282                         register unsigned long a4 asm("i4") = arg4;
 283                         register unsigned long a5 asm("i5") = arg5;
 284
 285                         __asm__ __volatile__(
 286                                 "std %0, [%6]\n\t"
 287                                 "std %2, [%6 + 8]\n\t"
 288                                 "std %4, [%6 + 16]\n\t" : :
 289                                 "r"(f), "r"(a1), "r"(a2), "r"(a3), "r"(a4), "r"(a5),
 290                                 "r" (&ccall_info.func));
 291                 }
 292
 293                 /* Init receive/complete mapping, plus fire the IPI's off. */
 294                 {
 295                         cpumask_t mask;
 296                         register int i;
 297
 298                         mask = cpumask_of_cpu(hard_smp4d_processor_id());
 299                         cpus_andnot(mask, cpu_online_map, mask);
 300                         for(i = 0; i <= high; i++) {
 301                                 if (cpu_isset(i, mask)) {
 302                                         ccall_info.processors_in[i] = 0;
 303                                         ccall_info.processors_out[i] = 0;
 304                                         sun4d_send_ipi(i, IRQ_CROSS_CALL);
 305                                 }
 306                         }
 307                 }
 308
 309                 {
 310                         register int i;
 311
 312                         i = 0;
 313                         do {
 314                                 while(!ccall_info.processors_in[i])
 315                                         barrier();
 316                         } while(++i <= high);
 317
 318                         i = 0;
 319                         do {
 320                                 while(!ccall_info.processors_out[i])
 321                                         barrier();
 322                         } while(++i <= high);
 323                 }
 324
 325                 spin_unlock_irqrestore(&cross_call_lock, flags);
 326         }
 327 }
 328
 329 /* Running cross calls. */
 330 void smp4d_cross_call_irq(void)
 331 {
 332         int i = hard_smp4d_processor_id();
 333
 334         ccall_info.processors_in[i] = 1;
 335         ccall_info.func(ccall_info.arg1, ccall_info.arg2, ccall_info.arg3,
 336                         ccall_info.arg4, ccall_info.arg5);
 337         ccall_info.processors_out[i] = 1;
 338 }
 339
 340 static int smp4d_stop_cpu_sender;
 341
 342 static void smp4d_stop_cpu(void)
 343 {
 344         int me = hard_smp4d_processor_id();
 345
 346         if (me != smp4d_stop_cpu_sender)
 347                 while(1) barrier();
 348 }
 349
 350 /* Cross calls, in order to work efficiently and atomically do all
 351  * the message passing work themselves, only stopcpu and reschedule
 352  * messages come through here.
 353  */
 354 void smp4d_message_pass(int target, int msg, unsigned long data, int wait)
 355 {
 356         int me = hard_smp4d_processor_id();
 357
 358         SMP_PRINTK(("smp4d_message_pass %d %d %08lx %d\n", target, msg, data, wait));
 359         if (msg == MSG_STOP_CPU && target == MSG_ALL_BUT_SELF) {
 360                 unsigned long flags;
 361                 static DEFINE_SPINLOCK(stop_cpu_lock);
 362                 spin_lock_irqsave(&stop_cpu_lock, flags);
 363                 smp4d_stop_cpu_sender = me;
 364                 smp4d_cross_call((smpfunc_t)smp4d_stop_cpu, 0, 0, 0, 0, 0);
 365                 spin_unlock_irqrestore(&stop_cpu_lock, flags);
 366         }
 367         printk("Yeeee, trying to send SMP msg(%d) to %d on cpu %d\n", msg, target, me);
 368         panic("Bogon SMP message pass.");
 369 }
 370
 371 void smp4d_percpu_timer_interrupt(struct pt_regs *regs)
 372 {
 373         struct pt_regs *old_regs;
 374         int cpu = hard_smp4d_processor_id();
 375         static int cpu_tick[NR_CPUS];
 376         static char led_mask[] = { 0xe, 0xd, 0xb, 0x7, 0xb, 0xd };
 377
 378         old_regs = set_irq_regs(regs);
 379         bw_get_prof_limit(cpu);
 380         bw_clear_intr_mask(0, 1);       /* INTR_TABLE[0] & 1 is Profile IRQ */
 381
 382         cpu_tick[cpu]++;
 383         if (!(cpu_tick[cpu] & 15)) {
 384                 if (cpu_tick[cpu] == 0x60)
 385                         cpu_tick[cpu] = 0;
 386                 cpu_leds[cpu] = led_mask[cpu_tick[cpu] >> 4];
 387                 show_leds(cpu);
 388         }
 389
 390         profile_tick(CPU_PROFILING);
 391
 392         if(!--prof_counter(cpu)) {
 393                 int user = user_mode(regs);
 394
 395                 irq_enter();
 396                 update_process_times(user);
 397                 irq_exit();
 398
 399                 prof_counter(cpu) = prof_multiplier(cpu);
 400         }
 401         set_irq_regs(old_regs);
 402 }
 403
 404 extern unsigned int lvl14_resolution;
 405
 406 static void __init smp_setup_percpu_timer(void)
 407 {
 408         int cpu = hard_smp4d_processor_id();
 409
 410         prof_counter(cpu) = prof_multiplier(cpu) = 1;
 411         load_profile_irq(cpu, lvl14_resolution);
 412 }
 413
 414 void __init smp4d_blackbox_id(unsigned *addr)
 415 {
 416         int rd = *addr & 0x3e000000;
 417
 418         addr[0] = 0xc0800800 | rd;              /* lda [%g0] ASI_M_VIKING_TMP1, reg */
 419         addr[1] = 0x01000000;                   /* nop */
 420         addr[2] = 0x01000000;                   /* nop */
 421 }
 422
 423 void __init smp4d_blackbox_current(unsigned *addr)
 424 {
 425         int rd = *addr & 0x3e000000;
 426
 427         addr[0] = 0xc0800800 | rd;              /* lda [%g0] ASI_M_VIKING_TMP1, reg */
 428         addr[2] = 0x81282002 | rd | (rd >> 11); /* sll reg, 2, reg */
 429         addr[4] = 0x01000000;                   /* nop */
 430 }
 431
 432 void __init sun4d_init_smp(void)
 433 {
 434         int i;
 435         extern unsigned int t_nmi[], linux_trap_ipi15_sun4d[], linux_trap_ipi15_sun4m[];
 436
 437         /* Patch ipi15 trap table */
 438         t_nmi[1] = t_nmi[1] + (linux_trap_ipi15_sun4d - linux_trap_ipi15_sun4m);
 439
 440         /* And set btfixup... */
 441         BTFIXUPSET_BLACKBOX(hard_smp_processor_id, smp4d_blackbox_id);
 442         BTFIXUPSET_BLACKBOX(load_current, smp4d_blackbox_current);
 443         BTFIXUPSET_CALL(smp_cross_call, smp4d_cross_call, BTFIXUPCALL_NORM);
 444         BTFIXUPSET_CALL(smp_message_pass, smp4d_message_pass, BTFIXUPCALL_NORM);
 445         BTFIXUPSET_CALL(__hard_smp_processor_id, __smp4d_processor_id, BTFIXUPCALL_NORM);
 446
 447         for (i = 0; i < NR_CPUS; i++) {
 448                 ccall_info.processors_in[i] = 1;
 449                 ccall_info.processors_out[i] = 1;
 450         }
 451 }