arch/sparc/kernel/sun4m_smp.c

   1 /* sun4m_smp.c: Sparc SUN4M SMP support.
   2  *
   3  * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
   4  */
   5
   6 #include <asm/head.h>
   7
   8 #include <linux/kernel.h>
   9 #include <linux/sched.h>
  10 #include <linux/threads.h>
  11 #include <linux/smp.h>
  12 #include <linux/smp_lock.h>
  13 #include <linux/interrupt.h>
  14 #include <linux/kernel_stat.h>
  15 #include <linux/init.h>
  16 #include <linux/spinlock.h>
  17 #include <linux/mm.h>
  18
  19 #include <asm/ptrace.h>
  20 #include <asm/atomic.h>
  21
  22 #include <asm/delay.h>
  23 #include <asm/irq.h>
  24 #include <asm/page.h>
  25 #include <asm/pgalloc.h>
  26 #include <asm/pgtable.h>
  27 #include <asm/oplib.h>
  28 #include <asm/hardirq.h>
  29 #include <asm/softirq.h>
  30
  31 #define __KERNEL_SYSCALLS__
  32 #include <linux/unistd.h>
  33
  34 #define IRQ_RESCHEDULE          13
  35 #define IRQ_STOP_CPU            14
  36 #define IRQ_CROSS_CALL          15
  37
  38 extern ctxd_t *srmmu_ctx_table_phys;
  39 extern int linux_num_cpus;
  40
  41 extern void calibrate_delay(void);
  42
  43 extern struct task_struct *current_set[NR_CPUS];
  44 extern volatile int smp_processors_ready;
  45 extern unsigned long cpu_present_map;
  46 extern int smp_num_cpus;
  47 extern int smp_threads_ready;
  48 extern unsigned char mid_xlate[NR_CPUS];
  49 extern volatile unsigned long cpu_callin_map[NR_CPUS];
  50 extern unsigned long smp_proc_in_lock[NR_CPUS];
  51 extern struct cpuinfo_sparc cpu_data[NR_CPUS];
  52 extern unsigned long cpu_offset[NR_CPUS];
  53 extern unsigned char boot_cpu_id;
  54 extern int smp_activated;
  55 extern volatile int __cpu_number_map[NR_CPUS];
  56 extern volatile int __cpu_logical_map[NR_CPUS];
  57 extern volatile unsigned long ipi_count;
  58 extern volatile int smp_process_available;
  59 extern volatile int smp_commenced;
  60 extern int __smp4m_processor_id(void);
  61
  62 extern unsigned long totalram_pages;
  63
  64 /*#define SMP_DEBUG*/
  65
  66 #ifdef SMP_DEBUG
  67 #define SMP_PRINTK(x)   printk x
  68 #else
  69 #define SMP_PRINTK(x)
  70 #endif
  71
  72 static inline unsigned long swap(volatile unsigned long *ptr, unsigned long val)
  73 {
  74         __asm__ __volatile__("swap [%1], %0\n\t" :
  75                              "=&r" (val), "=&r" (ptr) :
  76                              "0" (val), "1" (ptr));
  77         return val;
  78 }
  79
  80 static void smp_setup_percpu_timer(void);
  81 extern void cpu_probe(void);
  82
  83 void __init smp4m_callin(void)
  84 {
  85         int cpuid = hard_smp_processor_id();
  86
  87         local_flush_cache_all();
  88         local_flush_tlb_all();
  89
  90         set_irq_udt(mid_xlate[boot_cpu_id]);
  91
  92         /* Get our local ticker going. */
  93         smp_setup_percpu_timer();
  94
  95         calibrate_delay();
  96         smp_store_cpu_info(cpuid);
  97
  98         local_flush_cache_all();
  99         local_flush_tlb_all();
 100
 101         /*
 102          * Unblock the master CPU _only_ when the scheduler state
 103          * of all secondary CPUs will be up-to-date, so after
 104          * the SMP initialization the master will be just allowed
 105          * to call the scheduler code.
 106          */
 107         init_idle();
 108
 109         /* Allow master to continue. */
 110         swap((unsigned long *)&cpu_callin_map[cpuid], 1);
 111
 112         local_flush_cache_all();
 113         local_flush_tlb_all();
 114
 115         cpu_probe();
 116
 117         /* Fix idle thread fields. */
 118         __asm__ __volatile__("ld [%0], %%g6\n\t"
 119                              : : "r" (&current_set[cpuid])
 120                              : "memory" /* paranoid */);
 121
 122         /* Attach to the address space of init_task. */
 123         atomic_inc(&init_mm.mm_count);
 124         current->active_mm = &init_mm;
 125
 126         while(!smp_commenced)
 127                 barrier();
 128
 129         local_flush_cache_all();
 130         local_flush_tlb_all();
 131
 132         __sti();
 133 }
 134
 135 extern int cpu_idle(void *unused);
 136 extern void init_IRQ(void);
 137 extern void cpu_panic(void);
 138 extern int start_secondary(void *unused);
 139
 140 /*
 141  *      Cycle through the processors asking the PROM to start each one.
 142  */
 143
 144 extern struct prom_cpuinfo linux_cpus[NR_CPUS];
 145 extern struct linux_prom_registers smp_penguin_ctable;
 146 extern unsigned long trapbase_cpu1[];
 147 extern unsigned long trapbase_cpu2[];
 148 extern unsigned long trapbase_cpu3[];
 149
 150 void __init smp4m_boot_cpus(void)
 151 {
 152         int cpucount = 0;
 153         int i = 0;
 154         int first, prev;
 155
 156         printk("Entering SMP Mode...\n");
 157
 158         __sti();
 159         cpu_present_map = 0;
 160
 161         for(i=0; i < linux_num_cpus; i++)
 162                 cpu_present_map |= (1<<i);
 163
 164         for(i=0; i < NR_CPUS; i++) {
 165                 cpu_offset[i] = (char *)&cpu_data[i] - (char *)&cpu_data;
 166                 __cpu_number_map[i] = -1;
 167                 __cpu_logical_map[i] = -1;
 168         }
 169
 170         mid_xlate[boot_cpu_id] = (linux_cpus[boot_cpu_id].mid & ~8);
 171         __cpu_number_map[boot_cpu_id] = 0;
 172         __cpu_logical_map[0] = boot_cpu_id;
 173         current->processor = boot_cpu_id;
 174
 175         smp_store_cpu_info(boot_cpu_id);
 176         set_irq_udt(mid_xlate[boot_cpu_id]);
 177         smp_setup_percpu_timer();
 178         init_idle();
 179         local_flush_cache_all();
 180         if(linux_num_cpus == 1)
 181                 return;  /* Not an MP box. */
 182         for(i = 0; i < NR_CPUS; i++) {
 183                 if(i == boot_cpu_id)
 184                         continue;
 185
 186                 if(cpu_present_map & (1 << i)) {
 187                         extern unsigned long sun4m_cpu_startup;
 188                         unsigned long *entry = &sun4m_cpu_startup;
 189                         struct task_struct *p;
 190                         int timeout;
 191
 192                         /* Cook up an idler for this guy. */
 193                         kernel_thread(start_secondary, NULL, CLONE_PID);
 194
 195                         cpucount++;
 196
 197                         p = init_task.prev_task;
 198                         init_tasks[i] = p;
 199
 200                         p->processor = i;
 201                         p->has_cpu = 1; /* we schedule the first task manually */
 202
 203                         current_set[i] = p;
 204
 205                         del_from_runqueue(p);
 206                         unhash_process(p);
 207
 208                         /* See trampoline.S for details... */
 209                         entry += ((i-1) * 3);
 210
 211                         /*
 212                          * Initialize the contexts table
 213                          * Since the call to prom_startcpu() trashes the structure,
 214                          * we need to re-initialize it for each cpu
 215                          */
 216                         smp_penguin_ctable.which_io = 0;
 217                         smp_penguin_ctable.phys_addr = (unsigned int) srmmu_ctx_table_phys;
 218                         smp_penguin_ctable.reg_size = 0;
 219
 220                         /* whirrr, whirrr, whirrrrrrrrr... */
 221                         printk("Starting CPU %d at %p\n", i, entry);
 222                         mid_xlate[i] = (linux_cpus[i].mid & ~8);
 223                         local_flush_cache_all();
 224                         prom_startcpu(linux_cpus[i].prom_node,
 225                                       &smp_penguin_ctable, 0, (char *)entry);
 226
 227                         /* wheee... it's going... */
 228                         for(timeout = 0; timeout < 10000; timeout++) {
 229                                 if(cpu_callin_map[i])
 230                                         break;
 231                                 udelay(200);
 232                         }
 233                         if(cpu_callin_map[i]) {
 234                                 /* Another "Red Snapper". */
 235                                 __cpu_number_map[i] = i;
 236                                 __cpu_logical_map[i] = i;
 237                         } else {
 238                                 cpucount--;
 239                                 printk("Processor %d is stuck.\n", i);
 240                         }
 241                 }
 242                 if(!(cpu_callin_map[i])) {
 243                         cpu_present_map &= ~(1 << i);
 244                         __cpu_number_map[i] = -1;
 245                 }
 246         }
 247         local_flush_cache_all();
 248         if(cpucount == 0) {
 249                 printk("Error: only one Processor found.\n");
 250                 cpu_present_map = (1 << smp_processor_id());
 251         } else {
 252                 unsigned long bogosum = 0;
 253                 for(i = 0; i < NR_CPUS; i++) {
 254                         if(cpu_present_map & (1 << i))
 255                                 bogosum += cpu_data[i].udelay_val;
 256                 }
 257                 printk("Total of %d Processors activated (%lu.%02lu BogoMIPS).\n",
 258                        cpucount + 1,
 259                        (bogosum + 2500)/500000,
 260                        ((bogosum + 2500)/5000)%100);
 261                 smp_activated = 1;
 262                 smp_num_cpus = cpucount + 1;
 263         }
 264
 265         /* Setup CPU list for IRQ distribution scheme. */
 266         first = prev = -1;
 267         for(i = 0; i < NR_CPUS; i++) {
 268                 if(cpu_present_map & (1 << i)) {
 269                         if(first == -1)
 270                                 first = i;
 271                         if(prev != -1)
 272                                 cpu_data[prev].next = i;
 273                         cpu_data[i].mid = mid_xlate[i];
 274                         prev = i;
 275                 }
 276         }
 277         cpu_data[prev].next = first;
 278
 279         /* Free unneeded trap tables */
 280         if (!(cpu_present_map & (1 << 1))) {
 281                 ClearPageReserved(virt_to_page(trapbase_cpu1));
 282                 set_page_count(virt_to_page(trapbase_cpu1), 1);
 283                 free_page((unsigned long)trapbase_cpu1);
 284                 totalram_pages++;
 285                 num_physpages++;
 286         }
 287         if (!(cpu_present_map & (1 << 2))) {
 288                 ClearPageReserved(virt_to_page(trapbase_cpu2));
 289                 set_page_count(virt_to_page(trapbase_cpu2), 1);
 290                 free_page((unsigned long)trapbase_cpu2);
 291                 totalram_pages++;
 292                 num_physpages++;
 293         }
 294         if (!(cpu_present_map & (1 << 3))) {
 295                 ClearPageReserved(virt_to_page(trapbase_cpu3));
 296                 set_page_count(virt_to_page(trapbase_cpu3), 1);
 297                 free_page((unsigned long)trapbase_cpu3);
 298                 totalram_pages++;
 299                 num_physpages++;
 300         }
 301
 302         /* Ok, they are spinning and ready to go. */
 303         smp_processors_ready = 1;
 304 }
 305
 306 /* At each hardware IRQ, we get this called to forward IRQ reception
 307  * to the next processor.  The caller must disable the IRQ level being
 308  * serviced globally so that there are no double interrupts received.
 309  */
 310 void smp4m_irq_rotate(int cpu)
 311 {
 312         if(smp_processors_ready)
 313                 set_irq_udt(cpu_data[cpu_data[cpu].next].mid);
 314 }
 315
 316 /* Cross calls, in order to work efficiently and atomically do all
 317  * the message passing work themselves, only stopcpu and reschedule
 318  * messages come through here.
 319  */
 320 void smp4m_message_pass(int target, int msg, unsigned long data, int wait)
 321 {
 322         static unsigned long smp_cpu_in_msg[NR_CPUS];
 323         unsigned long mask;
 324         int me = smp_processor_id();
 325         int irq, i;
 326
 327         if(msg == MSG_RESCHEDULE) {
 328                 irq = IRQ_RESCHEDULE;
 329
 330                 if(smp_cpu_in_msg[me])
 331                         return;
 332         } else if(msg == MSG_STOP_CPU) {
 333                 irq = IRQ_STOP_CPU;
 334         } else {
 335                 goto barf;
 336         }
 337
 338         smp_cpu_in_msg[me]++;
 339         if(target == MSG_ALL_BUT_SELF || target == MSG_ALL) {
 340                 mask = cpu_present_map;
 341                 if(target == MSG_ALL_BUT_SELF)
 342                         mask &= ~(1 << me);
 343                 for(i = 0; i < 4; i++) {
 344                         if(mask & (1 << i))
 345                                 set_cpu_int(mid_xlate[i], irq);
 346                 }
 347         } else {
 348                 set_cpu_int(mid_xlate[target], irq);
 349         }
 350         smp_cpu_in_msg[me]--;
 351
 352         return;
 353 barf:
 354         printk("Yeeee, trying to send SMP msg(%d) on cpu %d\n", msg, me);
 355         panic("Bogon SMP message pass.");
 356 }
 357
 358 static struct smp_funcall {
 359         smpfunc_t func;
 360         unsigned long arg1;
 361         unsigned long arg2;
 362         unsigned long arg3;
 363         unsigned long arg4;
 364         unsigned long arg5;
 365         unsigned long processors_in[NR_CPUS];  /* Set when ipi entered. */
 366         unsigned long processors_out[NR_CPUS]; /* Set when ipi exited. */
 367 } ccall_info;
 368
 369 static spinlock_t cross_call_lock = SPIN_LOCK_UNLOCKED;
 370
 371 /* Cross calls must be serialized, at least currently. */
 372 void smp4m_cross_call(smpfunc_t func, unsigned long arg1, unsigned long arg2,
 373                     unsigned long arg3, unsigned long arg4, unsigned long arg5)
 374 {
 375         if(smp_processors_ready) {
 376                 register int ncpus = smp_num_cpus;
 377                 unsigned long flags;
 378
 379                 spin_lock_irqsave(&cross_call_lock, flags);
 380
 381                 /* Init function glue. */
 382                 ccall_info.func = func;
 383                 ccall_info.arg1 = arg1;
 384                 ccall_info.arg2 = arg2;
 385                 ccall_info.arg3 = arg3;
 386                 ccall_info.arg4 = arg4;
 387                 ccall_info.arg5 = arg5;
 388
 389                 /* Init receive/complete mapping, plus fire the IPI's off. */
 390                 {
 391                         register unsigned long mask;
 392                         register int i;
 393
 394                         mask = (cpu_present_map & ~(1 << smp_processor_id()));
 395                         for(i = 0; i < ncpus; i++) {
 396                                 if(mask & (1 << i)) {
 397                                         ccall_info.processors_in[i] = 0;
 398                                         ccall_info.processors_out[i] = 0;
 399                                         set_cpu_int(mid_xlate[i], IRQ_CROSS_CALL);
 400                                 } else {
 401                                         ccall_info.processors_in[i] = 1;
 402                                         ccall_info.processors_out[i] = 1;
 403                                 }
 404                         }
 405                 }
 406
 407                 {
 408                         register int i;
 409
 410                         i = 0;
 411                         do {
 412                                 while(!ccall_info.processors_in[i])
 413                                         barrier();
 414                         } while(++i < ncpus);
 415
 416                         i = 0;
 417                         do {
 418                                 while(!ccall_info.processors_out[i])
 419                                         barrier();
 420                         } while(++i < ncpus);
 421                 }
 422
 423                 spin_unlock_irqrestore(&cross_call_lock, flags);
 424         }
 425 }
 426
 427 /* Running cross calls. */
 428 void smp4m_cross_call_irq(void)
 429 {
 430         int i = smp_processor_id();
 431
 432         ccall_info.processors_in[i] = 1;
 433         ccall_info.func(ccall_info.arg1, ccall_info.arg2, ccall_info.arg3,
 434                         ccall_info.arg4, ccall_info.arg5);
 435         ccall_info.processors_out[i] = 1;
 436 }
 437
 438 extern unsigned int prof_multiplier[NR_CPUS];
 439 extern unsigned int prof_counter[NR_CPUS];
 440
 441 extern void sparc_do_profile(unsigned long pc, unsigned long o7);
 442
 443 void smp4m_percpu_timer_interrupt(struct pt_regs *regs)
 444 {
 445         int cpu = smp_processor_id();
 446
 447         clear_profile_irq(mid_xlate[cpu]);
 448
 449         if(!user_mode(regs))
 450                 sparc_do_profile(regs->pc, regs->u_regs[UREG_RETPC]);
 451
 452         if(!--prof_counter[cpu]) {
 453                 int user = user_mode(regs);
 454
 455                 irq_enter(cpu, 0);
 456                 update_process_times(user);
 457                 irq_exit(cpu, 0);
 458
 459                 prof_counter[cpu] = prof_multiplier[cpu];
 460         }
 461 }
 462
 463 extern unsigned int lvl14_resolution;
 464
 465 static void __init smp_setup_percpu_timer(void)
 466 {
 467         int cpu = smp_processor_id();
 468
 469         prof_counter[cpu] = prof_multiplier[cpu] = 1;
 470         load_profile_irq(mid_xlate[cpu], lvl14_resolution);
 471
 472         if(cpu == boot_cpu_id)
 473                 enable_pil_irq(14);
 474 }
 475
 476 void __init smp4m_blackbox_id(unsigned *addr)
 477 {
 478         int rd = *addr & 0x3e000000;
 479         int rs1 = rd >> 11;
 480
 481         addr[0] = 0x81580000 | rd;              /* rd %tbr, reg */
 482         addr[1] = 0x8130200c | rd | rs1;        /* srl reg, 0xc, reg */
 483         addr[2] = 0x80082003 | rd | rs1;        /* and reg, 3, reg */
 484 }
 485
 486 void __init smp4m_blackbox_current(unsigned *addr)
 487 {
 488         int rd = *addr & 0x3e000000;
 489         int rs1 = rd >> 11;
 490
 491         addr[0] = 0x81580000 | rd;              /* rd %tbr, reg */
 492         addr[2] = 0x8130200a | rd | rs1;        /* srl reg, 0xa, reg */
 493         addr[4] = 0x8008200c | rd | rs1;        /* and reg, 3, reg */
 494 }
 495
 496 void __init sun4m_init_smp(void)
 497 {
 498         BTFIXUPSET_BLACKBOX(smp_processor_id, smp4m_blackbox_id);
 499         BTFIXUPSET_BLACKBOX(load_current, smp4m_blackbox_current);
 500         BTFIXUPSET_CALL(smp_cross_call, smp4m_cross_call, BTFIXUPCALL_NORM);
 501         BTFIXUPSET_CALL(smp_message_pass, smp4m_message_pass, BTFIXUPCALL_NORM);
 502         BTFIXUPSET_CALL(__smp_processor_id, __smp4m_processor_id, BTFIXUPCALL_NORM);
 503 }