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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
  27 #include <asm/delay.h>
  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 #define IRQ_CROSS_CALL          15
  40
  41 extern ctxd_t *srmmu_ctx_table_phys;
  42
  43 extern void calibrate_delay(void);
  44
  45 extern volatile int smp_processors_ready;
  46 extern int smp_num_cpus;
  47 static int smp_highest_cpu;
  48 extern volatile unsigned long cpu_callin_map[NR_CPUS];
  49 extern struct cpuinfo_sparc cpu_data[NR_CPUS];
  50 extern unsigned char boot_cpu_id;
  51 extern int smp_activated;
  52 extern volatile int __cpu_number_map[NR_CPUS];
  53 extern volatile int __cpu_logical_map[NR_CPUS];
  54 extern volatile unsigned long ipi_count;
  55 extern volatile int smp_process_available;
  56 extern volatile int smp_commenced;
  57 extern int __smp4d_processor_id(void);
  58
  59 /* #define SMP_DEBUG */
  60
  61 #ifdef SMP_DEBUG
  62 #define SMP_PRINTK(x)   printk x
  63 #else
  64 #define SMP_PRINTK(x)
  65 #endif
  66
  67 static inline unsigned long swap(volatile unsigned long *ptr, unsigned long val)
  68 {
  69         __asm__ __volatile__("swap [%1], %0\n\t" :
  70                              "=&r" (val), "=&r" (ptr) :
  71                              "0" (val), "1" (ptr));
  72         return val;
  73 }
  74
  75 static void smp_setup_percpu_timer(void);
  76 extern void cpu_probe(void);
  77 extern void sun4d_distribute_irqs(void);
  78
  79 void __init smp4d_callin(void)
  80 {
  81         int cpuid = hard_smp4d_processor_id();
  82         extern spinlock_t sun4d_imsk_lock;
  83         unsigned long flags;
  84
  85         /* Show we are alive */
  86         cpu_leds[cpuid] = 0x6;
  87         show_leds(cpuid);
  88
  89         /* Enable level15 interrupt, disable level14 interrupt for now */
  90         cc_set_imsk((cc_get_imsk() & ~0x8000) | 0x4000);
  91
  92         local_flush_cache_all();
  93         local_flush_tlb_all();
  94
  95         /*
  96          * Unblock the master CPU _only_ when the scheduler state
  97          * of all secondary CPUs will be up-to-date, so after
  98          * the SMP initialization the master will be just allowed
  99          * to call the scheduler code.
 100          */
 101         /* Get our local ticker going. */
 102         smp_setup_percpu_timer();
 103
 104         calibrate_delay();
 105         smp_store_cpu_info(cpuid);
 106         local_flush_cache_all();
 107         local_flush_tlb_all();
 108
 109         /* Allow master to continue. */
 110         swap((unsigned long *)&cpu_callin_map[cpuid], 1);
 111         local_flush_cache_all();
 112         local_flush_tlb_all();
 113
 114         cpu_probe();
 115
 116         while((unsigned long)current_set[cpuid] < PAGE_OFFSET)
 117                 barrier();
 118
 119         while(current_set[cpuid]->cpu != cpuid)
 120                 barrier();
 121
 122         /* Fix idle thread fields. */
 123         __asm__ __volatile__("ld [%0], %%g6\n\t"
 124                              : : "r" (&current_set[cpuid])
 125                              : "memory" /* paranoid */);
 126
 127         cpu_leds[cpuid] = 0x9;
 128         show_leds(cpuid);
 129
 130         /* Attach to the address space of init_task. */
 131         atomic_inc(&init_mm.mm_count);
 132         current->active_mm = &init_mm;
 133
 134         local_flush_cache_all();
 135         local_flush_tlb_all();
 136
 137         local_irq_enable();     /* We don't allow PIL 14 yet */
 138
 139         while(!smp_commenced)
 140                 barrier();
 141
 142         spin_lock_irqsave(&sun4d_imsk_lock, flags);
 143         cc_set_imsk(cc_get_imsk() & ~0x4000); /* Allow PIL 14 as well */
 144         spin_unlock_irqrestore(&sun4d_imsk_lock, flags);
 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         int cpucount = 0;
 162         int i, mid;
 163
 164         printk("Entering SMP Mode...\n");
 165
 166         if (boot_cpu_id)
 167                 current_set[0] = NULL;
 168
 169         local_irq_enable();
 170         cpus_clear(cpu_present_map);
 171
 172         /* XXX This whole thing has to go.  See sparc64. */
 173         for (i = 0; !cpu_find_by_instance(i, NULL, &mid); i++)
 174                 cpu_set(mid, cpu_present_map);
 175         SMP_PRINTK(("cpu_present_map %08lx\n", cpus_addr(cpu_present_map)[0]));
 176         for(i=0; i < NR_CPUS; i++)
 177                 __cpu_number_map[i] = -1;
 178         for(i=0; i < NR_CPUS; i++)
 179                 __cpu_logical_map[i] = -1;
 180         __cpu_number_map[boot_cpu_id] = 0;
 181         __cpu_logical_map[0] = boot_cpu_id;
 182         current_thread_info()->cpu = boot_cpu_id;
 183         smp_store_cpu_info(boot_cpu_id);
 184         smp_setup_percpu_timer();
 185         local_flush_cache_all();
 186         if (cpu_find_by_instance(1, NULL, NULL))
 187                 return;  /* Not an MP box. */
 188         SMP_PRINTK(("Iterating over CPUs\n"));
 189         for(i = 0; i < NR_CPUS; i++) {
 190                 if(i == boot_cpu_id)
 191                         continue;
 192
 193                 if (cpu_isset(i, cpu_present_map)) {
 194                         extern unsigned long sun4d_cpu_startup;
 195                         unsigned long *entry = &sun4d_cpu_startup;
 196                         struct task_struct *p;
 197                         int timeout;
 198                         int no;
 199
 200                         /* Cook up an idler for this guy. */
 201                         p = fork_idle(i);
 202                         cpucount++;
 203                         current_set[i] = task_thread_info(p);
 204                         for (no = 0; !cpu_find_by_instance(no, NULL, &mid)
 205                                      && mid != i; no++) ;
 206
 207                         /*
 208                          * Initialize the contexts table
 209                          * Since the call to prom_startcpu() trashes the structure,
 210                          * we need to re-initialize it for each cpu
 211                          */
 212                         smp_penguin_ctable.which_io = 0;
 213                         smp_penguin_ctable.phys_addr = (unsigned int) srmmu_ctx_table_phys;
 214                         smp_penguin_ctable.reg_size = 0;
 215
 216                         /* whirrr, whirrr, whirrrrrrrrr... */
 217                         SMP_PRINTK(("Starting CPU %d at %p task %d node %08x\n", i, entry, cpucount, cpu_data(no).prom_node));
 218                         local_flush_cache_all();
 219                         prom_startcpu(cpu_data(no).prom_node,
 220                                       &smp_penguin_ctable, 0, (char *)entry);
 221
 222                         SMP_PRINTK(("prom_startcpu returned :)\n"));
 223
 224                         /* wheee... it's going... */
 225                         for(timeout = 0; timeout < 10000; timeout++) {
 226                                 if(cpu_callin_map[i])
 227                                         break;
 228                                 udelay(200);
 229                         }
 230
 231                         if(cpu_callin_map[i]) {
 232                                 /* Another "Red Snapper". */
 233                                 __cpu_number_map[i] = cpucount;
 234                                 __cpu_logical_map[cpucount] = i;
 235                         } else {
 236                                 cpucount--;
 237                                 printk("Processor %d is stuck.\n", i);
 238                         }
 239                 }
 240                 if(!(cpu_callin_map[i])) {
 241                         cpu_clear(i, cpu_present_map);
 242                         __cpu_number_map[i] = -1;
 243                 }
 244         }
 245         local_flush_cache_all();
 246         if(cpucount == 0) {
 247                 printk("Error: only one Processor found.\n");
 248                 cpu_present_map = cpumask_of_cpu(hard_smp4d_processor_id());
 249         } else {
 250                 unsigned long bogosum = 0;
 251
 252                 for(i = 0; i < NR_CPUS; i++) {
 253                         if (cpu_isset(i, cpu_present_map)) {
 254                                 bogosum += cpu_data(i).udelay_val;
 255                                 smp_highest_cpu = i;
 256                         }
 257                 }
 258                 SMP_PRINTK(("Total of %d Processors activated (%lu.%02lu BogoMIPS).\n", cpucount + 1, bogosum/(500000/HZ), (bogosum/(5000/HZ))%100));
 259                 printk("Total of %d Processors activated (%lu.%02lu BogoMIPS).\n",
 260                        cpucount + 1,
 261                        bogosum/(500000/HZ),
 262                        (bogosum/(5000/HZ))%100);
 263                 smp_activated = 1;
 264                 smp_num_cpus = cpucount + 1;
 265         }
 266
 267         /* Free unneeded trap tables */
 268         ClearPageReserved(virt_to_page(trapbase_cpu1));
 269         set_page_count(virt_to_page(trapbase_cpu1), 1);
 270         free_page((unsigned long)trapbase_cpu1);
 271         totalram_pages++;
 272         num_physpages++;
 273
 274         ClearPageReserved(virt_to_page(trapbase_cpu2));
 275         set_page_count(virt_to_page(trapbase_cpu2), 1);
 276         free_page((unsigned long)trapbase_cpu2);
 277         totalram_pages++;
 278         num_physpages++;
 279
 280         ClearPageReserved(virt_to_page(trapbase_cpu3));
 281         set_page_count(virt_to_page(trapbase_cpu3), 1);
 282         free_page((unsigned long)trapbase_cpu3);
 283         totalram_pages++;
 284         num_physpages++;
 285
 286         /* Ok, they are spinning and ready to go. */
 287         smp_processors_ready = 1;
 288         sun4d_distribute_irqs();
 289 }
 290
 291 static struct smp_funcall {
 292         smpfunc_t func;
 293         unsigned long arg1;
 294         unsigned long arg2;
 295         unsigned long arg3;
 296         unsigned long arg4;
 297         unsigned long arg5;
 298         unsigned char processors_in[NR_CPUS];  /* Set when ipi entered. */
 299         unsigned char processors_out[NR_CPUS]; /* Set when ipi exited. */
 300 } ccall_info __attribute__((aligned(8)));
 301
 302 static DEFINE_SPINLOCK(cross_call_lock);
 303
 304 /* Cross calls must be serialized, at least currently. */
 305 void smp4d_cross_call(smpfunc_t func, unsigned long arg1, unsigned long arg2,
 306                     unsigned long arg3, unsigned long arg4, unsigned long arg5)
 307 {
 308         if(smp_processors_ready) {
 309                 register int high = smp_highest_cpu;
 310                 unsigned long flags;
 311
 312                 spin_lock_irqsave(&cross_call_lock, flags);
 313
 314                 {
 315                         /* If you make changes here, make sure gcc generates proper code... */
 316                         register smpfunc_t f asm("i0") = func;
 317                         register unsigned long a1 asm("i1") = arg1;
 318                         register unsigned long a2 asm("i2") = arg2;
 319                         register unsigned long a3 asm("i3") = arg3;
 320                         register unsigned long a4 asm("i4") = arg4;
 321                         register unsigned long a5 asm("i5") = arg5;
 322
 323                         __asm__ __volatile__(
 324                                 "std %0, [%6]\n\t"
 325                                 "std %2, [%6 + 8]\n\t"
 326                                 "std %4, [%6 + 16]\n\t" : :
 327                                 "r"(f), "r"(a1), "r"(a2), "r"(a3), "r"(a4), "r"(a5),
 328                                 "r" (&ccall_info.func));
 329                 }
 330
 331                 /* Init receive/complete mapping, plus fire the IPI's off. */
 332                 {
 333                         cpumask_t mask;
 334                         register int i;
 335
 336                         mask = cpumask_of_cpu(hard_smp4d_processor_id());
 337                         cpus_andnot(mask, cpu_present_map, mask);
 338                         for(i = 0; i <= high; i++) {
 339                                 if (cpu_isset(i, mask)) {
 340                                         ccall_info.processors_in[i] = 0;
 341                                         ccall_info.processors_out[i] = 0;
 342                                         sun4d_send_ipi(i, IRQ_CROSS_CALL);
 343                                 }
 344                         }
 345                 }
 346
 347                 {
 348                         register int i;
 349
 350                         i = 0;
 351                         do {
 352                                 while(!ccall_info.processors_in[i])
 353                                         barrier();
 354                         } while(++i <= high);
 355
 356                         i = 0;
 357                         do {
 358                                 while(!ccall_info.processors_out[i])
 359                                         barrier();
 360                         } while(++i <= high);
 361                 }
 362
 363                 spin_unlock_irqrestore(&cross_call_lock, flags);
 364         }
 365 }
 366
 367 /* Running cross calls. */
 368 void smp4d_cross_call_irq(void)
 369 {
 370         int i = hard_smp4d_processor_id();
 371
 372         ccall_info.processors_in[i] = 1;
 373         ccall_info.func(ccall_info.arg1, ccall_info.arg2, ccall_info.arg3,
 374                         ccall_info.arg4, ccall_info.arg5);
 375         ccall_info.processors_out[i] = 1;
 376 }
 377
 378 static int smp4d_stop_cpu_sender;
 379
 380 static void smp4d_stop_cpu(void)
 381 {
 382         int me = hard_smp4d_processor_id();
 383
 384         if (me != smp4d_stop_cpu_sender)
 385                 while(1) barrier();
 386 }
 387
 388 /* Cross calls, in order to work efficiently and atomically do all
 389  * the message passing work themselves, only stopcpu and reschedule
 390  * messages come through here.
 391  */
 392 void smp4d_message_pass(int target, int msg, unsigned long data, int wait)
 393 {
 394         int me = hard_smp4d_processor_id();
 395
 396         SMP_PRINTK(("smp4d_message_pass %d %d %08lx %d\n", target, msg, data, wait));
 397         if (msg == MSG_STOP_CPU && target == MSG_ALL_BUT_SELF) {
 398                 unsigned long flags;
 399                 static DEFINE_SPINLOCK(stop_cpu_lock);
 400                 spin_lock_irqsave(&stop_cpu_lock, flags);
 401                 smp4d_stop_cpu_sender = me;
 402                 smp4d_cross_call((smpfunc_t)smp4d_stop_cpu, 0, 0, 0, 0, 0);
 403                 spin_unlock_irqrestore(&stop_cpu_lock, flags);
 404         }
 405         printk("Yeeee, trying to send SMP msg(%d) to %d on cpu %d\n", msg, target, me);
 406         panic("Bogon SMP message pass.");
 407 }
 408
 409 void smp4d_percpu_timer_interrupt(struct pt_regs *regs)
 410 {
 411         int cpu = hard_smp4d_processor_id();
 412         static int cpu_tick[NR_CPUS];
 413         static char led_mask[] = { 0xe, 0xd, 0xb, 0x7, 0xb, 0xd };
 414
 415         bw_get_prof_limit(cpu);
 416         bw_clear_intr_mask(0, 1);       /* INTR_TABLE[0] & 1 is Profile IRQ */
 417
 418         cpu_tick[cpu]++;
 419         if (!(cpu_tick[cpu] & 15)) {
 420                 if (cpu_tick[cpu] == 0x60)
 421                         cpu_tick[cpu] = 0;
 422                 cpu_leds[cpu] = led_mask[cpu_tick[cpu] >> 4];
 423                 show_leds(cpu);
 424         }
 425
 426         profile_tick(CPU_PROFILING, regs);
 427
 428         if(!--prof_counter(cpu)) {
 429                 int user = user_mode(regs);
 430
 431                 irq_enter();
 432                 update_process_times(user);
 433                 irq_exit();
 434
 435                 prof_counter(cpu) = prof_multiplier(cpu);
 436         }
 437 }
 438
 439 extern unsigned int lvl14_resolution;
 440
 441 static void __init smp_setup_percpu_timer(void)
 442 {
 443         int cpu = hard_smp4d_processor_id();
 444
 445         prof_counter(cpu) = prof_multiplier(cpu) = 1;
 446         load_profile_irq(cpu, lvl14_resolution);
 447 }
 448
 449 void __init smp4d_blackbox_id(unsigned *addr)
 450 {
 451         int rd = *addr & 0x3e000000;
 452
 453         addr[0] = 0xc0800800 | rd;              /* lda [%g0] ASI_M_VIKING_TMP1, reg */
 454         addr[1] = 0x01000000;                   /* nop */
 455         addr[2] = 0x01000000;                   /* nop */
 456 }
 457
 458 void __init smp4d_blackbox_current(unsigned *addr)
 459 {
 460         int rd = *addr & 0x3e000000;
 461
 462         addr[0] = 0xc0800800 | rd;              /* lda [%g0] ASI_M_VIKING_TMP1, reg */
 463         addr[2] = 0x81282002 | rd | (rd >> 11); /* sll reg, 2, reg */
 464         addr[4] = 0x01000000;                   /* nop */
 465 }
 466
 467 void __init sun4d_init_smp(void)
 468 {
 469         int i;
 470         extern unsigned int t_nmi[], linux_trap_ipi15_sun4d[], linux_trap_ipi15_sun4m[];
 471
 472         /* Patch ipi15 trap table */
 473         t_nmi[1] = t_nmi[1] + (linux_trap_ipi15_sun4d - linux_trap_ipi15_sun4m);
 474
 475         /* And set btfixup... */
 476         BTFIXUPSET_BLACKBOX(hard_smp_processor_id, smp4d_blackbox_id);
 477         BTFIXUPSET_BLACKBOX(load_current, smp4d_blackbox_current);
 478         BTFIXUPSET_CALL(smp_cross_call, smp4d_cross_call, BTFIXUPCALL_NORM);
 479         BTFIXUPSET_CALL(smp_message_pass, smp4d_message_pass, BTFIXUPCALL_NORM);
 480         BTFIXUPSET_CALL(__hard_smp_processor_id, __smp4d_processor_id, BTFIXUPCALL_NORM);
 481
 482         for (i = 0; i < NR_CPUS; i++) {
 483                 ccall_info.processors_in[i] = 1;
 484                 ccall_info.processors_out[i] = 1;
 485         }
 486 }