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