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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_each_present_cpu(i) {
 253                         bogosum += cpu_data(i).udelay_val;
 254                         smp_highest_cpu = i;
 255                 }
 256                 SMP_PRINTK(("Total of %d Processors activated (%lu.%02lu BogoMIPS).\n", cpucount + 1, bogosum/(500000/HZ), (bogosum/(5000/HZ))%100));
 257                 printk("Total of %d Processors activated (%lu.%02lu BogoMIPS).\n",
 258                        cpucount + 1,
 259                        bogosum/(500000/HZ),
 260                        (bogosum/(5000/HZ))%100);
 261                 smp_activated = 1;
 262                 smp_num_cpus = cpucount + 1;
 263         }
 264
 265         /* Free unneeded trap tables */
 266         ClearPageReserved(virt_to_page(trapbase_cpu1));
 267         init_page_count(virt_to_page(trapbase_cpu1));
 268         free_page((unsigned long)trapbase_cpu1);
 269         totalram_pages++;
 270         num_physpages++;
 271
 272         ClearPageReserved(virt_to_page(trapbase_cpu2));
 273         init_page_count(virt_to_page(trapbase_cpu2));
 274         free_page((unsigned long)trapbase_cpu2);
 275         totalram_pages++;
 276         num_physpages++;
 277
 278         ClearPageReserved(virt_to_page(trapbase_cpu3));
 279         init_page_count(virt_to_page(trapbase_cpu3));
 280         free_page((unsigned long)trapbase_cpu3);
 281         totalram_pages++;
 282         num_physpages++;
 283
 284         /* Ok, they are spinning and ready to go. */
 285         smp_processors_ready = 1;
 286         sun4d_distribute_irqs();
 287 }
 288
 289 static struct smp_funcall {
 290         smpfunc_t func;
 291         unsigned long arg1;
 292         unsigned long arg2;
 293         unsigned long arg3;
 294         unsigned long arg4;
 295         unsigned long arg5;
 296         unsigned char processors_in[NR_CPUS];  /* Set when ipi entered. */
 297         unsigned char processors_out[NR_CPUS]; /* Set when ipi exited. */
 298 } ccall_info __attribute__((aligned(8)));
 299
 300 static DEFINE_SPINLOCK(cross_call_lock);
 301
 302 /* Cross calls must be serialized, at least currently. */
 303 void smp4d_cross_call(smpfunc_t func, unsigned long arg1, unsigned long arg2,
 304                     unsigned long arg3, unsigned long arg4, unsigned long arg5)
 305 {
 306         if(smp_processors_ready) {
 307                 register int high = smp_highest_cpu;
 308                 unsigned long flags;
 309
 310                 spin_lock_irqsave(&cross_call_lock, flags);
 311
 312                 {
 313                         /* If you make changes here, make sure gcc generates proper code... */
 314                         register smpfunc_t f asm("i0") = func;
 315                         register unsigned long a1 asm("i1") = arg1;
 316                         register unsigned long a2 asm("i2") = arg2;
 317                         register unsigned long a3 asm("i3") = arg3;
 318                         register unsigned long a4 asm("i4") = arg4;
 319                         register unsigned long a5 asm("i5") = arg5;
 320
 321                         __asm__ __volatile__(
 322                                 "std %0, [%6]\n\t"
 323                                 "std %2, [%6 + 8]\n\t"
 324                                 "std %4, [%6 + 16]\n\t" : :
 325                                 "r"(f), "r"(a1), "r"(a2), "r"(a3), "r"(a4), "r"(a5),
 326                                 "r" (&ccall_info.func));
 327                 }
 328
 329                 /* Init receive/complete mapping, plus fire the IPI's off. */
 330                 {
 331                         cpumask_t mask;
 332                         register int i;
 333
 334                         mask = cpumask_of_cpu(hard_smp4d_processor_id());
 335                         cpus_andnot(mask, cpu_present_map, mask);
 336                         for(i = 0; i <= high; i++) {
 337                                 if (cpu_isset(i, mask)) {
 338                                         ccall_info.processors_in[i] = 0;
 339                                         ccall_info.processors_out[i] = 0;
 340                                         sun4d_send_ipi(i, IRQ_CROSS_CALL);
 341                                 }
 342                         }
 343                 }
 344
 345                 {
 346                         register int i;
 347
 348                         i = 0;
 349                         do {
 350                                 while(!ccall_info.processors_in[i])
 351                                         barrier();
 352                         } while(++i <= high);
 353
 354                         i = 0;
 355                         do {
 356                                 while(!ccall_info.processors_out[i])
 357                                         barrier();
 358                         } while(++i <= high);
 359                 }
 360
 361                 spin_unlock_irqrestore(&cross_call_lock, flags);
 362         }
 363 }
 364
 365 /* Running cross calls. */
 366 void smp4d_cross_call_irq(void)
 367 {
 368         int i = hard_smp4d_processor_id();
 369
 370         ccall_info.processors_in[i] = 1;
 371         ccall_info.func(ccall_info.arg1, ccall_info.arg2, ccall_info.arg3,
 372                         ccall_info.arg4, ccall_info.arg5);
 373         ccall_info.processors_out[i] = 1;
 374 }
 375
 376 static int smp4d_stop_cpu_sender;
 377
 378 static void smp4d_stop_cpu(void)
 379 {
 380         int me = hard_smp4d_processor_id();
 381
 382         if (me != smp4d_stop_cpu_sender)
 383                 while(1) barrier();
 384 }
 385
 386 /* Cross calls, in order to work efficiently and atomically do all
 387  * the message passing work themselves, only stopcpu and reschedule
 388  * messages come through here.
 389  */
 390 void smp4d_message_pass(int target, int msg, unsigned long data, int wait)
 391 {
 392         int me = hard_smp4d_processor_id();
 393
 394         SMP_PRINTK(("smp4d_message_pass %d %d %08lx %d\n", target, msg, data, wait));
 395         if (msg == MSG_STOP_CPU && target == MSG_ALL_BUT_SELF) {
 396                 unsigned long flags;
 397                 static DEFINE_SPINLOCK(stop_cpu_lock);
 398                 spin_lock_irqsave(&stop_cpu_lock, flags);
 399                 smp4d_stop_cpu_sender = me;
 400                 smp4d_cross_call((smpfunc_t)smp4d_stop_cpu, 0, 0, 0, 0, 0);
 401                 spin_unlock_irqrestore(&stop_cpu_lock, flags);
 402         }
 403         printk("Yeeee, trying to send SMP msg(%d) to %d on cpu %d\n", msg, target, me);
 404         panic("Bogon SMP message pass.");
 405 }
 406
 407 void smp4d_percpu_timer_interrupt(struct pt_regs *regs)
 408 {
 409         int cpu = hard_smp4d_processor_id();
 410         static int cpu_tick[NR_CPUS];
 411         static char led_mask[] = { 0xe, 0xd, 0xb, 0x7, 0xb, 0xd };
 412
 413         bw_get_prof_limit(cpu);
 414         bw_clear_intr_mask(0, 1);       /* INTR_TABLE[0] & 1 is Profile IRQ */
 415
 416         cpu_tick[cpu]++;
 417         if (!(cpu_tick[cpu] & 15)) {
 418                 if (cpu_tick[cpu] == 0x60)
 419                         cpu_tick[cpu] = 0;
 420                 cpu_leds[cpu] = led_mask[cpu_tick[cpu] >> 4];
 421                 show_leds(cpu);
 422         }
 423
 424         profile_tick(CPU_PROFILING, regs);
 425
 426         if(!--prof_counter(cpu)) {
 427                 int user = user_mode(regs);
 428
 429                 irq_enter();
 430                 update_process_times(user);
 431                 irq_exit();
 432
 433                 prof_counter(cpu) = prof_multiplier(cpu);
 434         }
 435 }
 436
 437 extern unsigned int lvl14_resolution;
 438
 439 static void __init smp_setup_percpu_timer(void)
 440 {
 441         int cpu = hard_smp4d_processor_id();
 442
 443         prof_counter(cpu) = prof_multiplier(cpu) = 1;
 444         load_profile_irq(cpu, lvl14_resolution);
 445 }
 446
 447 void __init smp4d_blackbox_id(unsigned *addr)
 448 {
 449         int rd = *addr & 0x3e000000;
 450
 451         addr[0] = 0xc0800800 | rd;              /* lda [%g0] ASI_M_VIKING_TMP1, reg */
 452         addr[1] = 0x01000000;                   /* nop */
 453         addr[2] = 0x01000000;                   /* nop */
 454 }
 455
 456 void __init smp4d_blackbox_current(unsigned *addr)
 457 {
 458         int rd = *addr & 0x3e000000;
 459
 460         addr[0] = 0xc0800800 | rd;              /* lda [%g0] ASI_M_VIKING_TMP1, reg */
 461         addr[2] = 0x81282002 | rd | (rd >> 11); /* sll reg, 2, reg */
 462         addr[4] = 0x01000000;                   /* nop */
 463 }
 464
 465 void __init sun4d_init_smp(void)
 466 {
 467         int i;
 468         extern unsigned int t_nmi[], linux_trap_ipi15_sun4d[], linux_trap_ipi15_sun4m[];
 469
 470         /* Patch ipi15 trap table */
 471         t_nmi[1] = t_nmi[1] + (linux_trap_ipi15_sun4d - linux_trap_ipi15_sun4m);
 472
 473         /* And set btfixup... */
 474         BTFIXUPSET_BLACKBOX(hard_smp_processor_id, smp4d_blackbox_id);
 475         BTFIXUPSET_BLACKBOX(load_current, smp4d_blackbox_current);
 476         BTFIXUPSET_CALL(smp_cross_call, smp4d_cross_call, BTFIXUPCALL_NORM);
 477         BTFIXUPSET_CALL(smp_message_pass, smp4d_message_pass, BTFIXUPCALL_NORM);
 478         BTFIXUPSET_CALL(__hard_smp_processor_id, __smp4d_processor_id, BTFIXUPCALL_NORM);
 479
 480         for (i = 0; i < NR_CPUS; i++) {
 481                 ccall_info.processors_in[i] = 1;
 482                 ccall_info.processors_out[i] = 1;
 483         }
 484 }