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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 #include <linux/cpu.h>
  24
  25 #include <asm/ptrace.h>
  26 #include <asm/atomic.h>
  27 #include <asm/irq_regs.h>
  28
  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/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 static unsigned char cpu_leds[32];
  76
  77 static inline void show_leds(int cpuid)
  78 {
  79         cpuid &= 0x1e;
  80         __asm__ __volatile__ ("stba %0, [%1] %2" : :
  81                               "r" ((cpu_leds[cpuid] << 4) | cpu_leds[cpuid+1]),
  82                               "r" (ECSR_BASE(cpuid) | BB_LEDS),
  83                               "i" (ASI_M_CTL));
  84 }
  85
  86 void __init smp4d_callin(void)
  87 {
  88         int cpuid = hard_smp4d_processor_id();
  89         extern spinlock_t sun4d_imsk_lock;
  90         unsigned long flags;
  91
  92         /* Show we are alive */
  93         cpu_leds[cpuid] = 0x6;
  94         show_leds(cpuid);
  95
  96         /* Enable level15 interrupt, disable level14 interrupt for now */
  97         cc_set_imsk((cc_get_imsk() & ~0x8000) | 0x4000);
  98
  99         local_flush_cache_all();
 100         local_flush_tlb_all();
 101
 102         notify_cpu_starting(cpuid);
 103         /*
 104          * Unblock the master CPU _only_ when the scheduler state
 105          * of all secondary CPUs will be up-to-date, so after
 106          * the SMP initialization the master will be just allowed
 107          * to call the scheduler code.
 108          */
 109         /* Get our local ticker going. */
 110         smp_setup_percpu_timer();
 111
 112         calibrate_delay();
 113         smp_store_cpu_info(cpuid);
 114         local_flush_cache_all();
 115         local_flush_tlb_all();
 116
 117         /* Allow master to continue. */
 118         swap((unsigned long *)&cpu_callin_map[cpuid], 1);
 119         local_flush_cache_all();
 120         local_flush_tlb_all();
 121
 122         cpu_probe();
 123
 124         while((unsigned long)current_set[cpuid] < PAGE_OFFSET)
 125                 barrier();
 126
 127         while(current_set[cpuid]->cpu != cpuid)
 128                 barrier();
 129
 130         /* Fix idle thread fields. */
 131         __asm__ __volatile__("ld [%0], %%g6\n\t"
 132                              : : "r" (&current_set[cpuid])
 133                              : "memory" /* paranoid */);
 134
 135         cpu_leds[cpuid] = 0x9;
 136         show_leds(cpuid);
 137
 138         /* Attach to the address space of init_task. */
 139         atomic_inc(&init_mm.mm_count);
 140         current->active_mm = &init_mm;
 141
 142         local_flush_cache_all();
 143         local_flush_tlb_all();
 144
 145         local_irq_enable();     /* We don't allow PIL 14 yet */
 146
 147         while (!cpu_isset(cpuid, smp_commenced_mask))
 148                 barrier();
 149
 150         spin_lock_irqsave(&sun4d_imsk_lock, flags);
 151         cc_set_imsk(cc_get_imsk() & ~0x4000); /* Allow PIL 14 as well */
 152         spin_unlock_irqrestore(&sun4d_imsk_lock, flags);
 153         cpu_set(cpuid, cpu_online_map);
 154
 155 }
 156
 157 extern void init_IRQ(void);
 158 extern void cpu_panic(void);
 159
 160 /*
 161  *      Cycle through the processors asking the PROM to start each one.
 162  */
 163
 164 extern struct linux_prom_registers smp_penguin_ctable;
 165 extern unsigned long trapbase_cpu1[];
 166 extern unsigned long trapbase_cpu2[];
 167 extern unsigned long trapbase_cpu3[];
 168
 169 void __init smp4d_boot_cpus(void)
 170 {
 171         if (boot_cpu_id)
 172                 current_set[0] = NULL;
 173         smp_setup_percpu_timer();
 174         local_flush_cache_all();
 175 }
 176
 177 int __cpuinit smp4d_boot_one_cpu(int i)
 178 {
 179                         extern unsigned long sun4d_cpu_startup;
 180                         unsigned long *entry = &sun4d_cpu_startup;
 181                         struct task_struct *p;
 182                         int timeout;
 183                         int cpu_node;
 184
 185                         cpu_find_by_instance(i, &cpu_node,NULL);
 186                         /* Cook up an idler for this guy. */
 187                         p = fork_idle(i);
 188                         current_set[i] = task_thread_info(p);
 189
 190                         /*
 191                          * Initialize the contexts table
 192                          * Since the call to prom_startcpu() trashes the structure,
 193                          * we need to re-initialize it for each cpu
 194                          */
 195                         smp_penguin_ctable.which_io = 0;
 196                         smp_penguin_ctable.phys_addr = (unsigned int) srmmu_ctx_table_phys;
 197                         smp_penguin_ctable.reg_size = 0;
 198
 199                         /* whirrr, whirrr, whirrrrrrrrr... */
 200                         SMP_PRINTK(("Starting CPU %d at %p \n", i, entry));
 201                         local_flush_cache_all();
 202                         prom_startcpu(cpu_node,
 203                                       &smp_penguin_ctable, 0, (char *)entry);
 204
 205                         SMP_PRINTK(("prom_startcpu returned :)\n"));
 206
 207                         /* wheee... it's going... */
 208                         for(timeout = 0; timeout < 10000; timeout++) {
 209                                 if(cpu_callin_map[i])
 210                                         break;
 211                                 udelay(200);
 212                         }
 213
 214         if (!(cpu_callin_map[i])) {
 215                 printk("Processor %d is stuck.\n", i);
 216                 return -ENODEV;
 217
 218         }
 219         local_flush_cache_all();
 220         return 0;
 221 }
 222
 223 void __init smp4d_smp_done(void)
 224 {
 225         int i, first;
 226         int *prev;
 227
 228         /* setup cpu list for irq rotation */
 229         first = 0;
 230         prev = &first;
 231         for (i = 0; i < NR_CPUS; i++)
 232                 if (cpu_online(i)) {
 233                         *prev = i;
 234                         prev = &cpu_data(i).next;
 235                 }
 236         *prev = first;
 237         local_flush_cache_all();
 238
 239         /* Free unneeded trap tables */
 240         ClearPageReserved(virt_to_page(trapbase_cpu1));
 241         init_page_count(virt_to_page(trapbase_cpu1));
 242         free_page((unsigned long)trapbase_cpu1);
 243         totalram_pages++;
 244         num_physpages++;
 245
 246         ClearPageReserved(virt_to_page(trapbase_cpu2));
 247         init_page_count(virt_to_page(trapbase_cpu2));
 248         free_page((unsigned long)trapbase_cpu2);
 249         totalram_pages++;
 250         num_physpages++;
 251
 252         ClearPageReserved(virt_to_page(trapbase_cpu3));
 253         init_page_count(virt_to_page(trapbase_cpu3));
 254         free_page((unsigned long)trapbase_cpu3);
 255         totalram_pages++;
 256         num_physpages++;
 257
 258         /* Ok, they are spinning and ready to go. */
 259         smp_processors_ready = 1;
 260         sun4d_distribute_irqs();
 261 }
 262
 263 static struct smp_funcall {
 264         smpfunc_t func;
 265         unsigned long arg1;
 266         unsigned long arg2;
 267         unsigned long arg3;
 268         unsigned long arg4;
 269         unsigned long arg5;
 270         unsigned char processors_in[NR_CPUS];  /* Set when ipi entered. */
 271         unsigned char processors_out[NR_CPUS]; /* Set when ipi exited. */
 272 } ccall_info __attribute__((aligned(8)));
 273
 274 static DEFINE_SPINLOCK(cross_call_lock);
 275
 276 /* Cross calls must be serialized, at least currently. */
 277 static void smp4d_cross_call(smpfunc_t func, cpumask_t mask, unsigned long arg1,
 278                              unsigned long arg2, unsigned long arg3,
 279                              unsigned long arg4)
 280 {
 281         if(smp_processors_ready) {
 282                 register int high = smp_highest_cpu;
 283                 unsigned long flags;
 284
 285                 spin_lock_irqsave(&cross_call_lock, flags);
 286
 287                 {
 288                         /* If you make changes here, make sure gcc generates proper code... */
 289                         register smpfunc_t f asm("i0") = func;
 290                         register unsigned long a1 asm("i1") = arg1;
 291                         register unsigned long a2 asm("i2") = arg2;
 292                         register unsigned long a3 asm("i3") = arg3;
 293                         register unsigned long a4 asm("i4") = arg4;
 294                         register unsigned long a5 asm("i5") = 0;
 295
 296                         __asm__ __volatile__(
 297                                 "std %0, [%6]\n\t"
 298                                 "std %2, [%6 + 8]\n\t"
 299                                 "std %4, [%6 + 16]\n\t" : :
 300                                 "r"(f), "r"(a1), "r"(a2), "r"(a3), "r"(a4), "r"(a5),
 301                                 "r" (&ccall_info.func));
 302                 }
 303
 304                 /* Init receive/complete mapping, plus fire the IPI's off. */
 305                 {
 306                         register int i;
 307
 308                         cpu_clear(smp_processor_id(), mask);
 309                         cpus_and(mask, cpu_online_map, mask);
 310                         for(i = 0; i <= high; i++) {
 311                                 if (cpu_isset(i, mask)) {
 312                                         ccall_info.processors_in[i] = 0;
 313                                         ccall_info.processors_out[i] = 0;
 314                                         sun4d_send_ipi(i, IRQ_CROSS_CALL);
 315                                 }
 316                         }
 317                 }
 318
 319                 {
 320                         register int i;
 321
 322                         i = 0;
 323                         do {
 324                                 if (!cpu_isset(i, mask))
 325                                         continue;
 326                                 while(!ccall_info.processors_in[i])
 327                                         barrier();
 328                         } while(++i <= high);
 329
 330                         i = 0;
 331                         do {
 332                                 if (!cpu_isset(i, mask))
 333                                         continue;
 334                                 while(!ccall_info.processors_out[i])
 335                                         barrier();
 336                         } while(++i <= high);
 337                 }
 338
 339                 spin_unlock_irqrestore(&cross_call_lock, flags);
 340         }
 341 }
 342
 343 /* Running cross calls. */
 344 void smp4d_cross_call_irq(void)
 345 {
 346         int i = hard_smp4d_processor_id();
 347
 348         ccall_info.processors_in[i] = 1;
 349         ccall_info.func(ccall_info.arg1, ccall_info.arg2, ccall_info.arg3,
 350                         ccall_info.arg4, ccall_info.arg5);
 351         ccall_info.processors_out[i] = 1;
 352 }
 353
 354 void smp4d_percpu_timer_interrupt(struct pt_regs *regs)
 355 {
 356         struct pt_regs *old_regs;
 357         int cpu = hard_smp4d_processor_id();
 358         static int cpu_tick[NR_CPUS];
 359         static char led_mask[] = { 0xe, 0xd, 0xb, 0x7, 0xb, 0xd };
 360
 361         old_regs = set_irq_regs(regs);
 362         bw_get_prof_limit(cpu);
 363         bw_clear_intr_mask(0, 1);       /* INTR_TABLE[0] & 1 is Profile IRQ */
 364
 365         cpu_tick[cpu]++;
 366         if (!(cpu_tick[cpu] & 15)) {
 367                 if (cpu_tick[cpu] == 0x60)
 368                         cpu_tick[cpu] = 0;
 369                 cpu_leds[cpu] = led_mask[cpu_tick[cpu] >> 4];
 370                 show_leds(cpu);
 371         }
 372
 373         profile_tick(CPU_PROFILING);
 374
 375         if(!--prof_counter(cpu)) {
 376                 int user = user_mode(regs);
 377
 378                 irq_enter();
 379                 update_process_times(user);
 380                 irq_exit();
 381
 382                 prof_counter(cpu) = prof_multiplier(cpu);
 383         }
 384         set_irq_regs(old_regs);
 385 }
 386
 387 extern unsigned int lvl14_resolution;
 388
 389 static void __init smp_setup_percpu_timer(void)
 390 {
 391         int cpu = hard_smp4d_processor_id();
 392
 393         prof_counter(cpu) = prof_multiplier(cpu) = 1;
 394         load_profile_irq(cpu, lvl14_resolution);
 395 }
 396
 397 void __init smp4d_blackbox_id(unsigned *addr)
 398 {
 399         int rd = *addr & 0x3e000000;
 400
 401         addr[0] = 0xc0800800 | rd;              /* lda [%g0] ASI_M_VIKING_TMP1, reg */
 402         addr[1] = 0x01000000;                   /* nop */
 403         addr[2] = 0x01000000;                   /* nop */
 404 }
 405
 406 void __init smp4d_blackbox_current(unsigned *addr)
 407 {
 408         int rd = *addr & 0x3e000000;
 409
 410         addr[0] = 0xc0800800 | rd;              /* lda [%g0] ASI_M_VIKING_TMP1, reg */
 411         addr[2] = 0x81282002 | rd | (rd >> 11); /* sll reg, 2, reg */
 412         addr[4] = 0x01000000;                   /* nop */
 413 }
 414
 415 void __init sun4d_init_smp(void)
 416 {
 417         int i;
 418         extern unsigned int t_nmi[], linux_trap_ipi15_sun4d[], linux_trap_ipi15_sun4m[];
 419
 420         /* Patch ipi15 trap table */
 421         t_nmi[1] = t_nmi[1] + (linux_trap_ipi15_sun4d - linux_trap_ipi15_sun4m);
 422
 423         /* And set btfixup... */
 424         BTFIXUPSET_BLACKBOX(hard_smp_processor_id, smp4d_blackbox_id);
 425         BTFIXUPSET_BLACKBOX(load_current, smp4d_blackbox_current);
 426         BTFIXUPSET_CALL(smp_cross_call, smp4d_cross_call, BTFIXUPCALL_NORM);
 427         BTFIXUPSET_CALL(__hard_smp_processor_id, __smp4d_processor_id, BTFIXUPCALL_NORM);
 428
 429         for (i = 0; i < NR_CPUS; i++) {
 430                 ccall_info.processors_in[i] = 1;
 431                 ccall_info.processors_out[i] = 1;
 432         }
 433 }