arch/sparc/kernel/sun4d_smp.c

   1 /* 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 <linux/interrupt.h>
  10 #include <linux/profile.h>
  11 #include <linux/delay.h>
  12 #include <linux/cpu.h>
  13
  14 #include <asm/sbi.h>
  15 #include <asm/mmu.h>
  16 #include <asm/tlbflush.h>
  17 #include <asm/cacheflush.h>
  18
  19 #include "kernel.h"
  20 #include "irq.h"
  21
  22 #define IRQ_CROSS_CALL          15
  23
  24 static volatile int smp_processors_ready;
  25 static int smp_highest_cpu;
  26
  27 static inline unsigned long sun4d_swap(volatile unsigned long *ptr, unsigned long val)
  28 {
  29         __asm__ __volatile__("swap [%1], %0\n\t" :
  30                              "=&r" (val), "=&r" (ptr) :
  31                              "0" (val), "1" (ptr));
  32         return val;
  33 }
  34
  35 static void smp_setup_percpu_timer(void);
  36
  37 static unsigned char cpu_leds[32];
  38
  39 static inline void show_leds(int cpuid)
  40 {
  41         cpuid &= 0x1e;
  42         __asm__ __volatile__ ("stba %0, [%1] %2" : :
  43                               "r" ((cpu_leds[cpuid] << 4) | cpu_leds[cpuid+1]),
  44                               "r" (ECSR_BASE(cpuid) | BB_LEDS),
  45                               "i" (ASI_M_CTL));
  46 }
  47
  48 void __cpuinit smp4d_callin(void)
  49 {
  50         int cpuid = hard_smp4d_processor_id();
  51         unsigned long flags;
  52
  53         /* Show we are alive */
  54         cpu_leds[cpuid] = 0x6;
  55         show_leds(cpuid);
  56
  57         /* Enable level15 interrupt, disable level14 interrupt for now */
  58         cc_set_imsk((cc_get_imsk() & ~0x8000) | 0x4000);
  59
  60         local_flush_cache_all();
  61         local_flush_tlb_all();
  62
  63         notify_cpu_starting(cpuid);
  64         /*
  65          * Unblock the master CPU _only_ when the scheduler state
  66          * of all secondary CPUs will be up-to-date, so after
  67          * the SMP initialization the master will be just allowed
  68          * to call the scheduler code.
  69          */
  70         /* Get our local ticker going. */
  71         smp_setup_percpu_timer();
  72
  73         calibrate_delay();
  74         smp_store_cpu_info(cpuid);
  75         local_flush_cache_all();
  76         local_flush_tlb_all();
  77
  78         /* Allow master to continue. */
  79         sun4d_swap((unsigned long *)&cpu_callin_map[cpuid], 1);
  80         local_flush_cache_all();
  81         local_flush_tlb_all();
  82
  83         cpu_probe();
  84
  85         while ((unsigned long)current_set[cpuid] < PAGE_OFFSET)
  86                 barrier();
  87
  88         while (current_set[cpuid]->cpu != cpuid)
  89                 barrier();
  90
  91         /* Fix idle thread fields. */
  92         __asm__ __volatile__("ld [%0], %%g6\n\t"
  93                              : : "r" (&current_set[cpuid])
  94                              : "memory" /* paranoid */);
  95
  96         cpu_leds[cpuid] = 0x9;
  97         show_leds(cpuid);
  98
  99         /* Attach to the address space of init_task. */
 100         atomic_inc(&init_mm.mm_count);
 101         current->active_mm = &init_mm;
 102
 103         local_flush_cache_all();
 104         local_flush_tlb_all();
 105
 106         local_irq_enable();     /* We don't allow PIL 14 yet */
 107
 108         while (!cpu_isset(cpuid, smp_commenced_mask))
 109                 barrier();
 110
 111         spin_lock_irqsave(&sun4d_imsk_lock, flags);
 112         cc_set_imsk(cc_get_imsk() & ~0x4000); /* Allow PIL 14 as well */
 113         spin_unlock_irqrestore(&sun4d_imsk_lock, flags);
 114         set_cpu_online(cpuid, true);
 115
 116 }
 117
 118 /*
 119  *      Cycle through the processors asking the PROM to start each one.
 120  */
 121 void __init smp4d_boot_cpus(void)
 122 {
 123         if (boot_cpu_id)
 124                 current_set[0] = NULL;
 125         smp_setup_percpu_timer();
 126         local_flush_cache_all();
 127 }
 128
 129 int __cpuinit smp4d_boot_one_cpu(int i)
 130 {
 131         unsigned long *entry = &sun4d_cpu_startup;
 132         struct task_struct *p;
 133         int timeout;
 134         int cpu_node;
 135
 136         cpu_find_by_instance(i, &cpu_node, NULL);
 137         /* Cook up an idler for this guy. */
 138         p = fork_idle(i);
 139         current_set[i] = task_thread_info(p);
 140
 141         /*
 142          * Initialize the contexts table
 143          * Since the call to prom_startcpu() trashes the structure,
 144          * we need to re-initialize it for each cpu
 145          */
 146         smp_penguin_ctable.which_io = 0;
 147         smp_penguin_ctable.phys_addr = (unsigned int) srmmu_ctx_table_phys;
 148         smp_penguin_ctable.reg_size = 0;
 149
 150         /* whirrr, whirrr, whirrrrrrrrr... */
 151         printk(KERN_INFO "Starting CPU %d at %p\n", i, entry);
 152         local_flush_cache_all();
 153         prom_startcpu(cpu_node,
 154                       &smp_penguin_ctable, 0, (char *)entry);
 155
 156         printk(KERN_INFO "prom_startcpu returned :)\n");
 157
 158         /* wheee... it's going... */
 159         for (timeout = 0; timeout < 10000; timeout++) {
 160                 if (cpu_callin_map[i])
 161                         break;
 162                 udelay(200);
 163         }
 164
 165         if (!(cpu_callin_map[i])) {
 166                 printk(KERN_ERR "Processor %d is stuck.\n", i);
 167                 return -ENODEV;
 168
 169         }
 170         local_flush_cache_all();
 171         return 0;
 172 }
 173
 174 void __init smp4d_smp_done(void)
 175 {
 176         int i, first;
 177         int *prev;
 178
 179         /* setup cpu list for irq rotation */
 180         first = 0;
 181         prev = &first;
 182         for_each_online_cpu(i) {
 183                 *prev = i;
 184                 prev = &cpu_data(i).next;
 185         }
 186         *prev = first;
 187         local_flush_cache_all();
 188
 189         /* Ok, they are spinning and ready to go. */
 190         smp_processors_ready = 1;
 191         sun4d_distribute_irqs();
 192 }
 193
 194 static struct smp_funcall {
 195         smpfunc_t func;
 196         unsigned long arg1;
 197         unsigned long arg2;
 198         unsigned long arg3;
 199         unsigned long arg4;
 200         unsigned long arg5;
 201         unsigned char processors_in[NR_CPUS];  /* Set when ipi entered. */
 202         unsigned char processors_out[NR_CPUS]; /* Set when ipi exited. */
 203 } ccall_info __attribute__((aligned(8)));
 204
 205 static DEFINE_SPINLOCK(cross_call_lock);
 206
 207 /* Cross calls must be serialized, at least currently. */
 208 static void smp4d_cross_call(smpfunc_t func, cpumask_t mask, unsigned long arg1,
 209                              unsigned long arg2, unsigned long arg3,
 210                              unsigned long arg4)
 211 {
 212         if (smp_processors_ready) {
 213                 register int high = smp_highest_cpu;
 214                 unsigned long flags;
 215
 216                 spin_lock_irqsave(&cross_call_lock, flags);
 217
 218                 {
 219                         /*
 220                          * If you make changes here, make sure
 221                          * gcc generates proper code...
 222                          */
 223                         register smpfunc_t f asm("i0") = func;
 224                         register unsigned long a1 asm("i1") = arg1;
 225                         register unsigned long a2 asm("i2") = arg2;
 226                         register unsigned long a3 asm("i3") = arg3;
 227                         register unsigned long a4 asm("i4") = arg4;
 228                         register unsigned long a5 asm("i5") = 0;
 229
 230                         __asm__ __volatile__(
 231                                 "std %0, [%6]\n\t"
 232                                 "std %2, [%6 + 8]\n\t"
 233                                 "std %4, [%6 + 16]\n\t" : :
 234                                 "r"(f), "r"(a1), "r"(a2), "r"(a3), "r"(a4), "r"(a5),
 235                                 "r" (&ccall_info.func));
 236                 }
 237
 238                 /* Init receive/complete mapping, plus fire the IPI's off. */
 239                 {
 240                         register int i;
 241
 242                         cpu_clear(smp_processor_id(), mask);
 243                         cpus_and(mask, cpu_online_map, mask);
 244                         for (i = 0; i <= high; i++) {
 245                                 if (cpu_isset(i, mask)) {
 246                                         ccall_info.processors_in[i] = 0;
 247                                         ccall_info.processors_out[i] = 0;
 248                                         sun4d_send_ipi(i, IRQ_CROSS_CALL);
 249                                 }
 250                         }
 251                 }
 252
 253                 {
 254                         register int i;
 255
 256                         i = 0;
 257                         do {
 258                                 if (!cpu_isset(i, mask))
 259                                         continue;
 260                                 while (!ccall_info.processors_in[i])
 261                                         barrier();
 262                         } while (++i <= high);
 263
 264                         i = 0;
 265                         do {
 266                                 if (!cpu_isset(i, mask))
 267                                         continue;
 268                                 while (!ccall_info.processors_out[i])
 269                                         barrier();
 270                         } while (++i <= high);
 271                 }
 272
 273                 spin_unlock_irqrestore(&cross_call_lock, flags);
 274         }
 275 }
 276
 277 /* Running cross calls. */
 278 void smp4d_cross_call_irq(void)
 279 {
 280         int i = hard_smp4d_processor_id();
 281
 282         ccall_info.processors_in[i] = 1;
 283         ccall_info.func(ccall_info.arg1, ccall_info.arg2, ccall_info.arg3,
 284                         ccall_info.arg4, ccall_info.arg5);
 285         ccall_info.processors_out[i] = 1;
 286 }
 287
 288 void smp4d_percpu_timer_interrupt(struct pt_regs *regs)
 289 {
 290         struct pt_regs *old_regs;
 291         int cpu = hard_smp4d_processor_id();
 292         static int cpu_tick[NR_CPUS];
 293         static char led_mask[] = { 0xe, 0xd, 0xb, 0x7, 0xb, 0xd };
 294
 295         old_regs = set_irq_regs(regs);
 296         bw_get_prof_limit(cpu);
 297         bw_clear_intr_mask(0, 1);       /* INTR_TABLE[0] & 1 is Profile IRQ */
 298
 299         cpu_tick[cpu]++;
 300         if (!(cpu_tick[cpu] & 15)) {
 301                 if (cpu_tick[cpu] == 0x60)
 302                         cpu_tick[cpu] = 0;
 303                 cpu_leds[cpu] = led_mask[cpu_tick[cpu] >> 4];
 304                 show_leds(cpu);
 305         }
 306
 307         profile_tick(CPU_PROFILING);
 308
 309         if (!--prof_counter(cpu)) {
 310                 int user = user_mode(regs);
 311
 312                 irq_enter();
 313                 update_process_times(user);
 314                 irq_exit();
 315
 316                 prof_counter(cpu) = prof_multiplier(cpu);
 317         }
 318         set_irq_regs(old_regs);
 319 }
 320
 321 static void __cpuinit smp_setup_percpu_timer(void)
 322 {
 323         int cpu = hard_smp4d_processor_id();
 324
 325         prof_counter(cpu) = prof_multiplier(cpu) = 1;
 326         load_profile_irq(cpu, lvl14_resolution);
 327 }
 328
 329 void __init smp4d_blackbox_id(unsigned *addr)
 330 {
 331         int rd = *addr & 0x3e000000;
 332
 333         addr[0] = 0xc0800800 | rd;              /* lda [%g0] ASI_M_VIKING_TMP1, reg */
 334         addr[1] = 0x01000000;                   /* nop */
 335         addr[2] = 0x01000000;                   /* nop */
 336 }
 337
 338 void __init smp4d_blackbox_current(unsigned *addr)
 339 {
 340         int rd = *addr & 0x3e000000;
 341
 342         addr[0] = 0xc0800800 | rd;              /* lda [%g0] ASI_M_VIKING_TMP1, reg */
 343         addr[2] = 0x81282002 | rd | (rd >> 11); /* sll reg, 2, reg */
 344         addr[4] = 0x01000000;                   /* nop */
 345 }
 346
 347 void __init sun4d_init_smp(void)
 348 {
 349         int i;
 350
 351         /* Patch ipi15 trap table */
 352         t_nmi[1] = t_nmi[1] + (linux_trap_ipi15_sun4d - linux_trap_ipi15_sun4m);
 353
 354         /* And set btfixup... */
 355         BTFIXUPSET_BLACKBOX(hard_smp_processor_id, smp4d_blackbox_id);
 356         BTFIXUPSET_BLACKBOX(load_current, smp4d_blackbox_current);
 357         BTFIXUPSET_CALL(smp_cross_call, smp4d_cross_call, BTFIXUPCALL_NORM);
 358         BTFIXUPSET_CALL(__hard_smp_processor_id, __smp4d_processor_id, BTFIXUPCALL_NORM);
 359
 360         for (i = 0; i < NR_CPUS; i++) {
 361                 ccall_info.processors_in[i] = 1;
 362                 ccall_info.processors_out[i] = 1;
 363         }
 364 }