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   1 /* smp.c: Sparc64 SMP support.
   2  *
   3  * Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu)
   4  */
   5
   6 #include <linux/module.h>
   7 #include <linux/kernel.h>
   8 #include <linux/sched.h>
   9 #include <linux/mm.h>
  10 #include <linux/pagemap.h>
  11 #include <linux/threads.h>
  12 #include <linux/smp.h>
  13 #include <linux/smp_lock.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/kernel_stat.h>
  16 #include <linux/delay.h>
  17 #include <linux/init.h>
  18 #include <linux/spinlock.h>
  19 #include <linux/fs.h>
  20 #include <linux/seq_file.h>
  21 #include <linux/cache.h>
  22 #include <linux/jiffies.h>
  23 #include <linux/profile.h>
  24 #include <linux/bootmem.h>
  25
  26 #include <asm/head.h>
  27 #include <asm/ptrace.h>
  28 #include <asm/atomic.h>
  29 #include <asm/tlbflush.h>
  30 #include <asm/mmu_context.h>
  31 #include <asm/cpudata.h>
  32
  33 #include <asm/irq.h>
  34 #include <asm/page.h>
  35 #include <asm/pgtable.h>
  36 #include <asm/oplib.h>
  37 #include <asm/uaccess.h>
  38 #include <asm/timer.h>
  39 #include <asm/starfire.h>
  40 #include <asm/tlb.h>
  41
  42 extern void calibrate_delay(void);
  43
  44 /* Please don't make this stuff initdata!!!  --DaveM */
  45 static unsigned char boot_cpu_id;
  46
  47 cpumask_t cpu_online_map __read_mostly = CPU_MASK_NONE;
  48 cpumask_t phys_cpu_present_map __read_mostly = CPU_MASK_NONE;
  49 static cpumask_t smp_commenced_mask;
  50 static cpumask_t cpu_callout_map;
  51
  52 void smp_info(struct seq_file *m)
  53 {
  54         int i;
  55
  56         seq_printf(m, "State:\n");
  57         for (i = 0; i < NR_CPUS; i++) {
  58                 if (cpu_online(i))
  59                         seq_printf(m,
  60                                    "CPU%d:\t\tonline\n", i);
  61         }
  62 }
  63
  64 void smp_bogo(struct seq_file *m)
  65 {
  66         int i;
  67
  68         for (i = 0; i < NR_CPUS; i++)
  69                 if (cpu_online(i))
  70                         seq_printf(m,
  71                                    "Cpu%dBogo\t: %lu.%02lu\n"
  72                                    "Cpu%dClkTck\t: %016lx\n",
  73                                    i, cpu_data(i).udelay_val / (500000/HZ),
  74                                    (cpu_data(i).udelay_val / (5000/HZ)) % 100,
  75                                    i, cpu_data(i).clock_tick);
  76 }
  77
  78 void __init smp_store_cpu_info(int id)
  79 {
  80         int cpu_node;
  81
  82         /* multiplier and counter set by
  83            smp_setup_percpu_timer()  */
  84         cpu_data(id).udelay_val                 = loops_per_jiffy;
  85
  86         cpu_find_by_mid(id, &cpu_node);
  87         cpu_data(id).clock_tick = prom_getintdefault(cpu_node,
  88                                                      "clock-frequency", 0);
  89
  90         cpu_data(id).pgcache_size               = 0;
  91         cpu_data(id).pte_cache[0]               = NULL;
  92         cpu_data(id).pte_cache[1]               = NULL;
  93         cpu_data(id).pgd_cache                  = NULL;
  94         cpu_data(id).idle_volume                = 1;
  95
  96         cpu_data(id).dcache_size = prom_getintdefault(cpu_node, "dcache-size",
  97                                                       16 * 1024);
  98         cpu_data(id).dcache_line_size =
  99                 prom_getintdefault(cpu_node, "dcache-line-size", 32);
 100         cpu_data(id).icache_size = prom_getintdefault(cpu_node, "icache-size",
 101                                                       16 * 1024);
 102         cpu_data(id).icache_line_size =
 103                 prom_getintdefault(cpu_node, "icache-line-size", 32);
 104         cpu_data(id).ecache_size = prom_getintdefault(cpu_node, "ecache-size",
 105                                                       4 * 1024 * 1024);
 106         cpu_data(id).ecache_line_size =
 107                 prom_getintdefault(cpu_node, "ecache-line-size", 64);
 108         printk("CPU[%d]: Caches "
 109                "D[sz(%d):line_sz(%d)] "
 110                "I[sz(%d):line_sz(%d)] "
 111                "E[sz(%d):line_sz(%d)]\n",
 112                id,
 113                cpu_data(id).dcache_size, cpu_data(id).dcache_line_size,
 114                cpu_data(id).icache_size, cpu_data(id).icache_line_size,
 115                cpu_data(id).ecache_size, cpu_data(id).ecache_line_size);
 116 }
 117
 118 static void smp_setup_percpu_timer(void);
 119
 120 static volatile unsigned long callin_flag = 0;
 121
 122 extern void inherit_locked_prom_mappings(int save_p);
 123
 124 static inline void cpu_setup_percpu_base(unsigned long cpu_id)
 125 {
 126         __asm__ __volatile__("mov       %0, %%g5\n\t"
 127                              "stxa      %0, [%1] %2\n\t"
 128                              "membar    #Sync"
 129                              : /* no outputs */
 130                              : "r" (__per_cpu_offset(cpu_id)),
 131                                "r" (TSB_REG), "i" (ASI_IMMU));
 132 }
 133
 134 void __init smp_callin(void)
 135 {
 136         int cpuid = hard_smp_processor_id();
 137
 138         inherit_locked_prom_mappings(0);
 139
 140         __flush_tlb_all();
 141
 142         cpu_setup_percpu_base(cpuid);
 143
 144         smp_setup_percpu_timer();
 145
 146         if (cheetah_pcache_forced_on)
 147                 cheetah_enable_pcache();
 148
 149         local_irq_enable();
 150
 151         calibrate_delay();
 152         smp_store_cpu_info(cpuid);
 153         callin_flag = 1;
 154         __asm__ __volatile__("membar #Sync\n\t"
 155                              "flush  %%g6" : : : "memory");
 156
 157         /* Clear this or we will die instantly when we
 158          * schedule back to this idler...
 159          */
 160         current_thread_info()->new_child = 0;
 161
 162         /* Attach to the address space of init_task. */
 163         atomic_inc(&init_mm.mm_count);
 164         current->active_mm = &init_mm;
 165
 166         while (!cpu_isset(cpuid, smp_commenced_mask))
 167                 rmb();
 168
 169         cpu_set(cpuid, cpu_online_map);
 170
 171         /* idle thread is expected to have preempt disabled */
 172         preempt_disable();
 173 }
 174
 175 void cpu_panic(void)
 176 {
 177         printk("CPU[%d]: Returns from cpu_idle!\n", smp_processor_id());
 178         panic("SMP bolixed\n");
 179 }
 180
 181 static unsigned long current_tick_offset __read_mostly;
 182
 183 /* This tick register synchronization scheme is taken entirely from
 184  * the ia64 port, see arch/ia64/kernel/smpboot.c for details and credit.
 185  *
 186  * The only change I've made is to rework it so that the master
 187  * initiates the synchonization instead of the slave. -DaveM
 188  */
 189
 190 #define MASTER  0
 191 #define SLAVE   (SMP_CACHE_BYTES/sizeof(unsigned long))
 192
 193 #define NUM_ROUNDS      64      /* magic value */
 194 #define NUM_ITERS       5       /* likewise */
 195
 196 static DEFINE_SPINLOCK(itc_sync_lock);
 197 static unsigned long go[SLAVE + 1];
 198
 199 #define DEBUG_TICK_SYNC 0
 200
 201 static inline long get_delta (long *rt, long *master)
 202 {
 203         unsigned long best_t0 = 0, best_t1 = ~0UL, best_tm = 0;
 204         unsigned long tcenter, t0, t1, tm;
 205         unsigned long i;
 206
 207         for (i = 0; i < NUM_ITERS; i++) {
 208                 t0 = tick_ops->get_tick();
 209                 go[MASTER] = 1;
 210                 membar_storeload();
 211                 while (!(tm = go[SLAVE]))
 212                         rmb();
 213                 go[SLAVE] = 0;
 214                 wmb();
 215                 t1 = tick_ops->get_tick();
 216
 217                 if (t1 - t0 < best_t1 - best_t0)
 218                         best_t0 = t0, best_t1 = t1, best_tm = tm;
 219         }
 220
 221         *rt = best_t1 - best_t0;
 222         *master = best_tm - best_t0;
 223
 224         /* average best_t0 and best_t1 without overflow: */
 225         tcenter = (best_t0/2 + best_t1/2);
 226         if (best_t0 % 2 + best_t1 % 2 == 2)
 227                 tcenter++;
 228         return tcenter - best_tm;
 229 }
 230
 231 void smp_synchronize_tick_client(void)
 232 {
 233         long i, delta, adj, adjust_latency = 0, done = 0;
 234         unsigned long flags, rt, master_time_stamp, bound;
 235 #if DEBUG_TICK_SYNC
 236         struct {
 237                 long rt;        /* roundtrip time */
 238                 long master;    /* master's timestamp */
 239                 long diff;      /* difference between midpoint and master's timestamp */
 240                 long lat;       /* estimate of itc adjustment latency */
 241         } t[NUM_ROUNDS];
 242 #endif
 243
 244         go[MASTER] = 1;
 245
 246         while (go[MASTER])
 247                 rmb();
 248
 249         local_irq_save(flags);
 250         {
 251                 for (i = 0; i < NUM_ROUNDS; i++) {
 252                         delta = get_delta(&rt, &master_time_stamp);
 253                         if (delta == 0) {
 254                                 done = 1;       /* let's lock on to this... */
 255                                 bound = rt;
 256                         }
 257
 258                         if (!done) {
 259                                 if (i > 0) {
 260                                         adjust_latency += -delta;
 261                                         adj = -delta + adjust_latency/4;
 262                                 } else
 263                                         adj = -delta;
 264
 265                                 tick_ops->add_tick(adj, current_tick_offset);
 266                         }
 267 #if DEBUG_TICK_SYNC
 268                         t[i].rt = rt;
 269                         t[i].master = master_time_stamp;
 270                         t[i].diff = delta;
 271                         t[i].lat = adjust_latency/4;
 272 #endif
 273                 }
 274         }
 275         local_irq_restore(flags);
 276
 277 #if DEBUG_TICK_SYNC
 278         for (i = 0; i < NUM_ROUNDS; i++)
 279                 printk("rt=%5ld master=%5ld diff=%5ld adjlat=%5ld\n",
 280                        t[i].rt, t[i].master, t[i].diff, t[i].lat);
 281 #endif
 282
 283         printk(KERN_INFO "CPU %d: synchronized TICK with master CPU (last diff %ld cycles,"
 284                "maxerr %lu cycles)\n", smp_processor_id(), delta, rt);
 285 }
 286
 287 static void smp_start_sync_tick_client(int cpu);
 288
 289 static void smp_synchronize_one_tick(int cpu)
 290 {
 291         unsigned long flags, i;
 292
 293         go[MASTER] = 0;
 294
 295         smp_start_sync_tick_client(cpu);
 296
 297         /* wait for client to be ready */
 298         while (!go[MASTER])
 299                 rmb();
 300
 301         /* now let the client proceed into his loop */
 302         go[MASTER] = 0;
 303         membar_storeload();
 304
 305         spin_lock_irqsave(&itc_sync_lock, flags);
 306         {
 307                 for (i = 0; i < NUM_ROUNDS*NUM_ITERS; i++) {
 308                         while (!go[MASTER])
 309                                 rmb();
 310                         go[MASTER] = 0;
 311                         wmb();
 312                         go[SLAVE] = tick_ops->get_tick();
 313                         membar_storeload();
 314                 }
 315         }
 316         spin_unlock_irqrestore(&itc_sync_lock, flags);
 317 }
 318
 319 extern unsigned long sparc64_cpu_startup;
 320
 321 /* The OBP cpu startup callback truncates the 3rd arg cookie to
 322  * 32-bits (I think) so to be safe we have it read the pointer
 323  * contained here so we work on >4GB machines. -DaveM
 324  */
 325 static struct thread_info *cpu_new_thread = NULL;
 326
 327 static int __devinit smp_boot_one_cpu(unsigned int cpu)
 328 {
 329         unsigned long entry =
 330                 (unsigned long)(&sparc64_cpu_startup);
 331         unsigned long cookie =
 332                 (unsigned long)(&cpu_new_thread);
 333         struct task_struct *p;
 334         int timeout, ret, cpu_node;
 335
 336         p = fork_idle(cpu);
 337         callin_flag = 0;
 338         cpu_new_thread = task_thread_info(p);
 339         cpu_set(cpu, cpu_callout_map);
 340
 341         cpu_find_by_mid(cpu, &cpu_node);
 342         prom_startcpu(cpu_node, entry, cookie);
 343
 344         for (timeout = 0; timeout < 5000000; timeout++) {
 345                 if (callin_flag)
 346                         break;
 347                 udelay(100);
 348         }
 349         if (callin_flag) {
 350                 ret = 0;
 351         } else {
 352                 printk("Processor %d is stuck.\n", cpu);
 353                 cpu_clear(cpu, cpu_callout_map);
 354                 ret = -ENODEV;
 355         }
 356         cpu_new_thread = NULL;
 357
 358         return ret;
 359 }
 360
 361 static void spitfire_xcall_helper(u64 data0, u64 data1, u64 data2, u64 pstate, unsigned long cpu)
 362 {
 363         u64 result, target;
 364         int stuck, tmp;
 365
 366         if (this_is_starfire) {
 367                 /* map to real upaid */
 368                 cpu = (((cpu & 0x3c) << 1) |
 369                         ((cpu & 0x40) >> 4) |
 370                         (cpu & 0x3));
 371         }
 372
 373         target = (cpu << 14) | 0x70;
 374 again:
 375         /* Ok, this is the real Spitfire Errata #54.
 376          * One must read back from a UDB internal register
 377          * after writes to the UDB interrupt dispatch, but
 378          * before the membar Sync for that write.
 379          * So we use the high UDB control register (ASI 0x7f,
 380          * ADDR 0x20) for the dummy read. -DaveM
 381          */
 382         tmp = 0x40;
 383         __asm__ __volatile__(
 384         "wrpr   %1, %2, %%pstate\n\t"
 385         "stxa   %4, [%0] %3\n\t"
 386         "stxa   %5, [%0+%8] %3\n\t"
 387         "add    %0, %8, %0\n\t"
 388         "stxa   %6, [%0+%8] %3\n\t"
 389         "membar #Sync\n\t"
 390         "stxa   %%g0, [%7] %3\n\t"
 391         "membar #Sync\n\t"
 392         "mov    0x20, %%g1\n\t"
 393         "ldxa   [%%g1] 0x7f, %%g0\n\t"
 394         "membar #Sync"
 395         : "=r" (tmp)
 396         : "r" (pstate), "i" (PSTATE_IE), "i" (ASI_INTR_W),
 397           "r" (data0), "r" (data1), "r" (data2), "r" (target),
 398           "r" (0x10), "0" (tmp)
 399         : "g1");
 400
 401         /* NOTE: PSTATE_IE is still clear. */
 402         stuck = 100000;
 403         do {
 404                 __asm__ __volatile__("ldxa [%%g0] %1, %0"
 405                         : "=r" (result)
 406                         : "i" (ASI_INTR_DISPATCH_STAT));
 407                 if (result == 0) {
 408                         __asm__ __volatile__("wrpr %0, 0x0, %%pstate"
 409                                              : : "r" (pstate));
 410                         return;
 411                 }
 412                 stuck -= 1;
 413                 if (stuck == 0)
 414                         break;
 415         } while (result & 0x1);
 416         __asm__ __volatile__("wrpr %0, 0x0, %%pstate"
 417                              : : "r" (pstate));
 418         if (stuck == 0) {
 419                 printk("CPU[%d]: mondo stuckage result[%016lx]\n",
 420                        smp_processor_id(), result);
 421         } else {
 422                 udelay(2);
 423                 goto again;
 424         }
 425 }
 426
 427 static __inline__ void spitfire_xcall_deliver(u64 data0, u64 data1, u64 data2, cpumask_t mask)
 428 {
 429         u64 pstate;
 430         int i;
 431
 432         __asm__ __volatile__("rdpr %%pstate, %0" : "=r" (pstate));
 433         for_each_cpu_mask(i, mask)
 434                 spitfire_xcall_helper(data0, data1, data2, pstate, i);
 435 }
 436
 437 /* Cheetah now allows to send the whole 64-bytes of data in the interrupt
 438  * packet, but we have no use for that.  However we do take advantage of
 439  * the new pipelining feature (ie. dispatch to multiple cpus simultaneously).
 440  */
 441 static void cheetah_xcall_deliver(u64 data0, u64 data1, u64 data2, cpumask_t mask)
 442 {
 443         u64 pstate, ver;
 444         int nack_busy_id, is_jalapeno;
 445
 446         if (cpus_empty(mask))
 447                 return;
 448
 449         /* Unfortunately, someone at Sun had the brilliant idea to make the
 450          * busy/nack fields hard-coded by ITID number for this Ultra-III
 451          * derivative processor.
 452          */
 453         __asm__ ("rdpr %%ver, %0" : "=r" (ver));
 454         is_jalapeno = ((ver >> 32) == 0x003e0016);
 455
 456         __asm__ __volatile__("rdpr %%pstate, %0" : "=r" (pstate));
 457
 458 retry:
 459         __asm__ __volatile__("wrpr %0, %1, %%pstate\n\t"
 460                              : : "r" (pstate), "i" (PSTATE_IE));
 461
 462         /* Setup the dispatch data registers. */
 463         __asm__ __volatile__("stxa      %0, [%3] %6\n\t"
 464                              "stxa      %1, [%4] %6\n\t"
 465                              "stxa      %2, [%5] %6\n\t"
 466                              "membar    #Sync\n\t"
 467                              : /* no outputs */
 468                              : "r" (data0), "r" (data1), "r" (data2),
 469                                "r" (0x40), "r" (0x50), "r" (0x60),
 470                                "i" (ASI_INTR_W));
 471
 472         nack_busy_id = 0;
 473         {
 474                 int i;
 475
 476                 for_each_cpu_mask(i, mask) {
 477                         u64 target = (i << 14) | 0x70;
 478
 479                         if (!is_jalapeno)
 480                                 target |= (nack_busy_id << 24);
 481                         __asm__ __volatile__(
 482                                 "stxa   %%g0, [%0] %1\n\t"
 483                                 "membar #Sync\n\t"
 484                                 : /* no outputs */
 485                                 : "r" (target), "i" (ASI_INTR_W));
 486                         nack_busy_id++;
 487                 }
 488         }
 489
 490         /* Now, poll for completion. */
 491         {
 492                 u64 dispatch_stat;
 493                 long stuck;
 494
 495                 stuck = 100000 * nack_busy_id;
 496                 do {
 497                         __asm__ __volatile__("ldxa      [%%g0] %1, %0"
 498                                              : "=r" (dispatch_stat)
 499                                              : "i" (ASI_INTR_DISPATCH_STAT));
 500                         if (dispatch_stat == 0UL) {
 501                                 __asm__ __volatile__("wrpr %0, 0x0, %%pstate"
 502                                                      : : "r" (pstate));
 503                                 return;
 504                         }
 505                         if (!--stuck)
 506                                 break;
 507                 } while (dispatch_stat & 0x5555555555555555UL);
 508
 509                 __asm__ __volatile__("wrpr %0, 0x0, %%pstate"
 510                                      : : "r" (pstate));
 511
 512                 if ((dispatch_stat & ~(0x5555555555555555UL)) == 0) {
 513                         /* Busy bits will not clear, continue instead
 514                          * of freezing up on this cpu.
 515                          */
 516                         printk("CPU[%d]: mondo stuckage result[%016lx]\n",
 517                                smp_processor_id(), dispatch_stat);
 518                 } else {
 519                         int i, this_busy_nack = 0;
 520
 521                         /* Delay some random time with interrupts enabled
 522                          * to prevent deadlock.
 523                          */
 524                         udelay(2 * nack_busy_id);
 525
 526                         /* Clear out the mask bits for cpus which did not
 527                          * NACK us.
 528                          */
 529                         for_each_cpu_mask(i, mask) {
 530                                 u64 check_mask;
 531
 532                                 if (is_jalapeno)
 533                                         check_mask = (0x2UL << (2*i));
 534                                 else
 535                                         check_mask = (0x2UL <<
 536                                                       this_busy_nack);
 537                                 if ((dispatch_stat & check_mask) == 0)
 538                                         cpu_clear(i, mask);
 539                                 this_busy_nack += 2;
 540                         }
 541
 542                         goto retry;
 543                 }
 544         }
 545 }
 546
 547 /* Send cross call to all processors mentioned in MASK
 548  * except self.
 549  */
 550 static void smp_cross_call_masked(unsigned long *func, u32 ctx, u64 data1, u64 data2, cpumask_t mask)
 551 {
 552         u64 data0 = (((u64)ctx)<<32 | (((u64)func) & 0xffffffff));
 553         int this_cpu = get_cpu();
 554
 555         cpus_and(mask, mask, cpu_online_map);
 556         cpu_clear(this_cpu, mask);
 557
 558         if (tlb_type == spitfire)
 559                 spitfire_xcall_deliver(data0, data1, data2, mask);
 560         else
 561                 cheetah_xcall_deliver(data0, data1, data2, mask);
 562         /* NOTE: Caller runs local copy on master. */
 563
 564         put_cpu();
 565 }
 566
 567 extern unsigned long xcall_sync_tick;
 568
 569 static void smp_start_sync_tick_client(int cpu)
 570 {
 571         cpumask_t mask = cpumask_of_cpu(cpu);
 572
 573         smp_cross_call_masked(&xcall_sync_tick,
 574                               0, 0, 0, mask);
 575 }
 576
 577 /* Send cross call to all processors except self. */
 578 #define smp_cross_call(func, ctx, data1, data2) \
 579         smp_cross_call_masked(func, ctx, data1, data2, cpu_online_map)
 580
 581 struct call_data_struct {
 582         void (*func) (void *info);
 583         void *info;
 584         atomic_t finished;
 585         int wait;
 586 };
 587
 588 static DEFINE_SPINLOCK(call_lock);
 589 static struct call_data_struct *call_data;
 590
 591 extern unsigned long xcall_call_function;
 592
 593 /*
 594  * You must not call this function with disabled interrupts or from a
 595  * hardware interrupt handler or from a bottom half handler.
 596  */
 597 int smp_call_function(void (*func)(void *info), void *info,
 598                       int nonatomic, int wait)
 599 {
 600         struct call_data_struct data;
 601         int cpus = num_online_cpus() - 1;
 602         long timeout;
 603
 604         if (!cpus)
 605                 return 0;
 606
 607         /* Can deadlock when called with interrupts disabled */
 608         WARN_ON(irqs_disabled());
 609
 610         data.func = func;
 611         data.info = info;
 612         atomic_set(&data.finished, 0);
 613         data.wait = wait;
 614
 615         spin_lock(&call_lock);
 616
 617         call_data = &data;
 618
 619         smp_cross_call(&xcall_call_function, 0, 0, 0);
 620
 621         /*
 622          * Wait for other cpus to complete function or at
 623          * least snap the call data.
 624          */
 625         timeout = 1000000;
 626         while (atomic_read(&data.finished) != cpus) {
 627                 if (--timeout <= 0)
 628                         goto out_timeout;
 629                 barrier();
 630                 udelay(1);
 631         }
 632
 633         spin_unlock(&call_lock);
 634
 635         return 0;
 636
 637 out_timeout:
 638         spin_unlock(&call_lock);
 639         printk("XCALL: Remote cpus not responding, ncpus=%ld finished=%ld\n",
 640                (long) num_online_cpus() - 1L,
 641                (long) atomic_read(&data.finished));
 642         return 0;
 643 }
 644
 645 void smp_call_function_client(int irq, struct pt_regs *regs)
 646 {
 647         void (*func) (void *info) = call_data->func;
 648         void *info = call_data->info;
 649
 650         clear_softint(1 << irq);
 651         if (call_data->wait) {
 652                 /* let initiator proceed only after completion */
 653                 func(info);
 654                 atomic_inc(&call_data->finished);
 655         } else {
 656                 /* let initiator proceed after getting data */
 657                 atomic_inc(&call_data->finished);
 658                 func(info);
 659         }
 660 }
 661
 662 extern unsigned long xcall_flush_tlb_mm;
 663 extern unsigned long xcall_flush_tlb_pending;
 664 extern unsigned long xcall_flush_tlb_kernel_range;
 665 extern unsigned long xcall_flush_tlb_all_spitfire;
 666 extern unsigned long xcall_flush_tlb_all_cheetah;
 667 extern unsigned long xcall_report_regs;
 668 extern unsigned long xcall_receive_signal;
 669
 670 #ifdef DCACHE_ALIASING_POSSIBLE
 671 extern unsigned long xcall_flush_dcache_page_cheetah;
 672 #endif
 673 extern unsigned long xcall_flush_dcache_page_spitfire;
 674
 675 #ifdef CONFIG_DEBUG_DCFLUSH
 676 extern atomic_t dcpage_flushes;
 677 extern atomic_t dcpage_flushes_xcall;
 678 #endif
 679
 680 static __inline__ void __local_flush_dcache_page(struct page *page)
 681 {
 682 #ifdef DCACHE_ALIASING_POSSIBLE
 683         __flush_dcache_page(page_address(page),
 684                             ((tlb_type == spitfire) &&
 685                              page_mapping(page) != NULL));
 686 #else
 687         if (page_mapping(page) != NULL &&
 688             tlb_type == spitfire)
 689                 __flush_icache_page(__pa(page_address(page)));
 690 #endif
 691 }
 692
 693 void smp_flush_dcache_page_impl(struct page *page, int cpu)
 694 {
 695         cpumask_t mask = cpumask_of_cpu(cpu);
 696         int this_cpu = get_cpu();
 697
 698 #ifdef CONFIG_DEBUG_DCFLUSH
 699         atomic_inc(&dcpage_flushes);
 700 #endif
 701         if (cpu == this_cpu) {
 702                 __local_flush_dcache_page(page);
 703         } else if (cpu_online(cpu)) {
 704                 void *pg_addr = page_address(page);
 705                 u64 data0;
 706
 707                 if (tlb_type == spitfire) {
 708                         data0 =
 709                                 ((u64)&xcall_flush_dcache_page_spitfire);
 710                         if (page_mapping(page) != NULL)
 711                                 data0 |= ((u64)1 << 32);
 712                         spitfire_xcall_deliver(data0,
 713                                                __pa(pg_addr),
 714                                                (u64) pg_addr,
 715                                                mask);
 716                 } else {
 717 #ifdef DCACHE_ALIASING_POSSIBLE
 718                         data0 =
 719                                 ((u64)&xcall_flush_dcache_page_cheetah);
 720                         cheetah_xcall_deliver(data0,
 721                                               __pa(pg_addr),
 722                                               0, mask);
 723 #endif
 724                 }
 725 #ifdef CONFIG_DEBUG_DCFLUSH
 726                 atomic_inc(&dcpage_flushes_xcall);
 727 #endif
 728         }
 729
 730         put_cpu();
 731 }
 732
 733 void flush_dcache_page_all(struct mm_struct *mm, struct page *page)
 734 {
 735         void *pg_addr = page_address(page);
 736         cpumask_t mask = cpu_online_map;
 737         u64 data0;
 738         int this_cpu = get_cpu();
 739
 740         cpu_clear(this_cpu, mask);
 741
 742 #ifdef CONFIG_DEBUG_DCFLUSH
 743         atomic_inc(&dcpage_flushes);
 744 #endif
 745         if (cpus_empty(mask))
 746                 goto flush_self;
 747         if (tlb_type == spitfire) {
 748                 data0 = ((u64)&xcall_flush_dcache_page_spitfire);
 749                 if (page_mapping(page) != NULL)
 750                         data0 |= ((u64)1 << 32);
 751                 spitfire_xcall_deliver(data0,
 752                                        __pa(pg_addr),
 753                                        (u64) pg_addr,
 754                                        mask);
 755         } else {
 756 #ifdef DCACHE_ALIASING_POSSIBLE
 757                 data0 = ((u64)&xcall_flush_dcache_page_cheetah);
 758                 cheetah_xcall_deliver(data0,
 759                                       __pa(pg_addr),
 760                                       0, mask);
 761 #endif
 762         }
 763 #ifdef CONFIG_DEBUG_DCFLUSH
 764         atomic_inc(&dcpage_flushes_xcall);
 765 #endif
 766  flush_self:
 767         __local_flush_dcache_page(page);
 768
 769         put_cpu();
 770 }
 771
 772 void smp_receive_signal(int cpu)
 773 {
 774         cpumask_t mask = cpumask_of_cpu(cpu);
 775
 776         if (cpu_online(cpu)) {
 777                 u64 data0 = (((u64)&xcall_receive_signal) & 0xffffffff);
 778
 779                 if (tlb_type == spitfire)
 780                         spitfire_xcall_deliver(data0, 0, 0, mask);
 781                 else
 782                         cheetah_xcall_deliver(data0, 0, 0, mask);
 783         }
 784 }
 785
 786 void smp_receive_signal_client(int irq, struct pt_regs *regs)
 787 {
 788         /* Just return, rtrap takes care of the rest. */
 789         clear_softint(1 << irq);
 790 }
 791
 792 void smp_report_regs(void)
 793 {
 794         smp_cross_call(&xcall_report_regs, 0, 0, 0);
 795 }
 796
 797 void smp_flush_tlb_all(void)
 798 {
 799         if (tlb_type == spitfire)
 800                 smp_cross_call(&xcall_flush_tlb_all_spitfire, 0, 0, 0);
 801         else
 802                 smp_cross_call(&xcall_flush_tlb_all_cheetah, 0, 0, 0);
 803         __flush_tlb_all();
 804 }
 805
 806 /* We know that the window frames of the user have been flushed
 807  * to the stack before we get here because all callers of us
 808  * are flush_tlb_*() routines, and these run after flush_cache_*()
 809  * which performs the flushw.
 810  *
 811  * The SMP TLB coherency scheme we use works as follows:
 812  *
 813  * 1) mm->cpu_vm_mask is a bit mask of which cpus an address
 814  *    space has (potentially) executed on, this is the heuristic
 815  *    we use to avoid doing cross calls.
 816  *
 817  *    Also, for flushing from kswapd and also for clones, we
 818  *    use cpu_vm_mask as the list of cpus to make run the TLB.
 819  *
 820  * 2) TLB context numbers are shared globally across all processors
 821  *    in the system, this allows us to play several games to avoid
 822  *    cross calls.
 823  *
 824  *    One invariant is that when a cpu switches to a process, and
 825  *    that processes tsk->active_mm->cpu_vm_mask does not have the
 826  *    current cpu's bit set, that tlb context is flushed locally.
 827  *
 828  *    If the address space is non-shared (ie. mm->count == 1) we avoid
 829  *    cross calls when we want to flush the currently running process's
 830  *    tlb state.  This is done by clearing all cpu bits except the current
 831  *    processor's in current->active_mm->cpu_vm_mask and performing the
 832  *    flush locally only.  This will force any subsequent cpus which run
 833  *    this task to flush the context from the local tlb if the process
 834  *    migrates to another cpu (again).
 835  *
 836  * 3) For shared address spaces (threads) and swapping we bite the
 837  *    bullet for most cases and perform the cross call (but only to
 838  *    the cpus listed in cpu_vm_mask).
 839  *
 840  *    The performance gain from "optimizing" away the cross call for threads is
 841  *    questionable (in theory the big win for threads is the massive sharing of
 842  *    address space state across processors).
 843  */
 844
 845 /* This currently is only used by the hugetlb arch pre-fault
 846  * hook on UltraSPARC-III+ and later when changing the pagesize
 847  * bits of the context register for an address space.
 848  */
 849 void smp_flush_tlb_mm(struct mm_struct *mm)
 850 {
 851         u32 ctx = CTX_HWBITS(mm->context);
 852         int cpu = get_cpu();
 853
 854         if (atomic_read(&mm->mm_users) == 1) {
 855                 mm->cpu_vm_mask = cpumask_of_cpu(cpu);
 856                 goto local_flush_and_out;
 857         }
 858
 859         smp_cross_call_masked(&xcall_flush_tlb_mm,
 860                               ctx, 0, 0,
 861                               mm->cpu_vm_mask);
 862
 863 local_flush_and_out:
 864         __flush_tlb_mm(ctx, SECONDARY_CONTEXT);
 865
 866         put_cpu();
 867 }
 868
 869 void smp_flush_tlb_pending(struct mm_struct *mm, unsigned long nr, unsigned long *vaddrs)
 870 {
 871         u32 ctx = CTX_HWBITS(mm->context);
 872         int cpu = get_cpu();
 873
 874         if (mm == current->active_mm && atomic_read(&mm->mm_users) == 1)
 875                 mm->cpu_vm_mask = cpumask_of_cpu(cpu);
 876         else
 877                 smp_cross_call_masked(&xcall_flush_tlb_pending,
 878                                       ctx, nr, (unsigned long) vaddrs,
 879                                       mm->cpu_vm_mask);
 880
 881         __flush_tlb_pending(ctx, nr, vaddrs);
 882
 883         put_cpu();
 884 }
 885
 886 void smp_flush_tlb_kernel_range(unsigned long start, unsigned long end)
 887 {
 888         start &= PAGE_MASK;
 889         end    = PAGE_ALIGN(end);
 890         if (start != end) {
 891                 smp_cross_call(&xcall_flush_tlb_kernel_range,
 892                                0, start, end);
 893
 894                 __flush_tlb_kernel_range(start, end);
 895         }
 896 }
 897
 898 /* CPU capture. */
 899 /* #define CAPTURE_DEBUG */
 900 extern unsigned long xcall_capture;
 901
 902 static atomic_t smp_capture_depth = ATOMIC_INIT(0);
 903 static atomic_t smp_capture_registry = ATOMIC_INIT(0);
 904 static unsigned long penguins_are_doing_time;
 905
 906 void smp_capture(void)
 907 {
 908         int result = atomic_add_ret(1, &smp_capture_depth);
 909
 910         if (result == 1) {
 911                 int ncpus = num_online_cpus();
 912
 913 #ifdef CAPTURE_DEBUG
 914                 printk("CPU[%d]: Sending penguins to jail...",
 915                        smp_processor_id());
 916 #endif
 917                 penguins_are_doing_time = 1;
 918                 membar_storestore_loadstore();
 919                 atomic_inc(&smp_capture_registry);
 920                 smp_cross_call(&xcall_capture, 0, 0, 0);
 921                 while (atomic_read(&smp_capture_registry) != ncpus)
 922                         rmb();
 923 #ifdef CAPTURE_DEBUG
 924                 printk("done\n");
 925 #endif
 926         }
 927 }
 928
 929 void smp_release(void)
 930 {
 931         if (atomic_dec_and_test(&smp_capture_depth)) {
 932 #ifdef CAPTURE_DEBUG
 933                 printk("CPU[%d]: Giving pardon to "
 934                        "imprisoned penguins\n",
 935                        smp_processor_id());
 936 #endif
 937                 penguins_are_doing_time = 0;
 938                 membar_storeload_storestore();
 939                 atomic_dec(&smp_capture_registry);
 940         }
 941 }
 942
 943 /* Imprisoned penguins run with %pil == 15, but PSTATE_IE set, so they
 944  * can service tlb flush xcalls...
 945  */
 946 extern void prom_world(int);
 947 extern void save_alternate_globals(unsigned long *);
 948 extern void restore_alternate_globals(unsigned long *);
 949 void smp_penguin_jailcell(int irq, struct pt_regs *regs)
 950 {
 951         unsigned long global_save[24];
 952
 953         clear_softint(1 << irq);
 954
 955         preempt_disable();
 956
 957         __asm__ __volatile__("flushw");
 958         save_alternate_globals(global_save);
 959         prom_world(1);
 960         atomic_inc(&smp_capture_registry);
 961         membar_storeload_storestore();
 962         while (penguins_are_doing_time)
 963                 rmb();
 964         restore_alternate_globals(global_save);
 965         atomic_dec(&smp_capture_registry);
 966         prom_world(0);
 967
 968         preempt_enable();
 969 }
 970
 971 #define prof_multiplier(__cpu)          cpu_data(__cpu).multiplier
 972 #define prof_counter(__cpu)             cpu_data(__cpu).counter
 973
 974 void smp_percpu_timer_interrupt(struct pt_regs *regs)
 975 {
 976         unsigned long compare, tick, pstate;
 977         int cpu = smp_processor_id();
 978         int user = user_mode(regs);
 979
 980         /*
 981          * Check for level 14 softint.
 982          */
 983         {
 984                 unsigned long tick_mask = tick_ops->softint_mask;
 985
 986                 if (!(get_softint() & tick_mask)) {
 987                         extern void handler_irq(int, struct pt_regs *);
 988
 989                         handler_irq(14, regs);
 990                         return;
 991                 }
 992                 clear_softint(tick_mask);
 993         }
 994
 995         do {
 996                 profile_tick(CPU_PROFILING, regs);
 997                 if (!--prof_counter(cpu)) {
 998                         irq_enter();
 999
1000                         if (cpu == boot_cpu_id) {
1001                                 kstat_this_cpu.irqs[0]++;
1002                                 timer_tick_interrupt(regs);
1003                         }
1004
1005                         update_process_times(user);
1006
1007                         irq_exit();
1008
1009                         prof_counter(cpu) = prof_multiplier(cpu);
1010                 }
1011
1012                 /* Guarantee that the following sequences execute
1013                  * uninterrupted.
1014                  */
1015                 __asm__ __volatile__("rdpr      %%pstate, %0\n\t"
1016                                      "wrpr      %0, %1, %%pstate"
1017                                      : "=r" (pstate)
1018                                      : "i" (PSTATE_IE));
1019
1020                 compare = tick_ops->add_compare(current_tick_offset);
1021                 tick = tick_ops->get_tick();
1022
1023                 /* Restore PSTATE_IE. */
1024                 __asm__ __volatile__("wrpr      %0, 0x0, %%pstate"
1025                                      : /* no outputs */
1026                                      : "r" (pstate));
1027         } while (time_after_eq(tick, compare));
1028 }
1029
1030 static void __init smp_setup_percpu_timer(void)
1031 {
1032         int cpu = smp_processor_id();
1033         unsigned long pstate;
1034
1035         prof_counter(cpu) = prof_multiplier(cpu) = 1;
1036
1037         /* Guarantee that the following sequences execute
1038          * uninterrupted.
1039          */
1040         __asm__ __volatile__("rdpr      %%pstate, %0\n\t"
1041                              "wrpr      %0, %1, %%pstate"
1042                              : "=r" (pstate)
1043                              : "i" (PSTATE_IE));
1044
1045         tick_ops->init_tick(current_tick_offset);
1046
1047         /* Restore PSTATE_IE. */
1048         __asm__ __volatile__("wrpr      %0, 0x0, %%pstate"
1049                              : /* no outputs */
1050                              : "r" (pstate));
1051 }
1052
1053 void __init smp_tick_init(void)
1054 {
1055         boot_cpu_id = hard_smp_processor_id();
1056         current_tick_offset = timer_tick_offset;
1057
1058         cpu_set(boot_cpu_id, cpu_online_map);
1059         prof_counter(boot_cpu_id) = prof_multiplier(boot_cpu_id) = 1;
1060 }
1061
1062 /* /proc/profile writes can call this, don't __init it please. */
1063 static DEFINE_SPINLOCK(prof_setup_lock);
1064
1065 int setup_profiling_timer(unsigned int multiplier)
1066 {
1067         unsigned long flags;
1068         int i;
1069
1070         if ((!multiplier) || (timer_tick_offset / multiplier) < 1000)
1071                 return -EINVAL;
1072
1073         spin_lock_irqsave(&prof_setup_lock, flags);
1074         for (i = 0; i < NR_CPUS; i++)
1075                 prof_multiplier(i) = multiplier;
1076         current_tick_offset = (timer_tick_offset / multiplier);
1077         spin_unlock_irqrestore(&prof_setup_lock, flags);
1078
1079         return 0;
1080 }
1081
1082 /* Constrain the number of cpus to max_cpus.  */
1083 void __init smp_prepare_cpus(unsigned int max_cpus)
1084 {
1085         if (num_possible_cpus() > max_cpus) {
1086                 int instance, mid;
1087
1088                 instance = 0;
1089                 while (!cpu_find_by_instance(instance, NULL, &mid)) {
1090                         if (mid != boot_cpu_id) {
1091                                 cpu_clear(mid, phys_cpu_present_map);
1092                                 if (num_possible_cpus() <= max_cpus)
1093                                         break;
1094                         }
1095                         instance++;
1096                 }
1097         }
1098
1099         smp_store_cpu_info(boot_cpu_id);
1100 }
1101
1102 /* Set this up early so that things like the scheduler can init
1103  * properly.  We use the same cpu mask for both the present and
1104  * possible cpu map.
1105  */
1106 void __init smp_setup_cpu_possible_map(void)
1107 {
1108         int instance, mid;
1109
1110         instance = 0;
1111         while (!cpu_find_by_instance(instance, NULL, &mid)) {
1112                 if (mid < NR_CPUS)
1113                         cpu_set(mid, phys_cpu_present_map);
1114                 instance++;
1115         }
1116 }
1117
1118 void __devinit smp_prepare_boot_cpu(void)
1119 {
1120         if (hard_smp_processor_id() >= NR_CPUS) {
1121                 prom_printf("Serious problem, boot cpu id >= NR_CPUS\n");
1122                 prom_halt();
1123         }
1124
1125         current_thread_info()->cpu = hard_smp_processor_id();
1126
1127         cpu_set(smp_processor_id(), cpu_online_map);
1128         cpu_set(smp_processor_id(), phys_cpu_present_map);
1129 }
1130
1131 int __devinit __cpu_up(unsigned int cpu)
1132 {
1133         int ret = smp_boot_one_cpu(cpu);
1134
1135         if (!ret) {
1136                 cpu_set(cpu, smp_commenced_mask);
1137                 while (!cpu_isset(cpu, cpu_online_map))
1138                         mb();
1139                 if (!cpu_isset(cpu, cpu_online_map)) {
1140                         ret = -ENODEV;
1141                 } else {
1142                         smp_synchronize_one_tick(cpu);
1143                 }
1144         }
1145         return ret;
1146 }
1147
1148 void __init smp_cpus_done(unsigned int max_cpus)
1149 {
1150         unsigned long bogosum = 0;
1151         int i;
1152
1153         for (i = 0; i < NR_CPUS; i++) {
1154                 if (cpu_online(i))
1155                         bogosum += cpu_data(i).udelay_val;
1156         }
1157         printk("Total of %ld processors activated "
1158                "(%lu.%02lu BogoMIPS).\n",
1159                (long) num_online_cpus(),
1160                bogosum/(500000/HZ),
1161                (bogosum/(5000/HZ))%100);
1162 }
1163
1164 void smp_send_reschedule(int cpu)
1165 {
1166         smp_receive_signal(cpu);
1167 }
1168
1169 /* This is a nop because we capture all other cpus
1170  * anyways when making the PROM active.
1171  */
1172 void smp_send_stop(void)
1173 {
1174 }
1175
1176 unsigned long __per_cpu_base __read_mostly;
1177 unsigned long __per_cpu_shift __read_mostly;
1178
1179 EXPORT_SYMBOL(__per_cpu_base);
1180 EXPORT_SYMBOL(__per_cpu_shift);
1181
1182 void __init setup_per_cpu_areas(void)
1183 {
1184         unsigned long goal, size, i;
1185         char *ptr;
1186         /* Created by linker magic */
1187         extern char __per_cpu_start[], __per_cpu_end[];
1188
1189         /* Copy section for each CPU (we discard the original) */
1190         goal = ALIGN(__per_cpu_end - __per_cpu_start, PAGE_SIZE);
1191
1192 #ifdef CONFIG_MODULES
1193         if (goal < PERCPU_ENOUGH_ROOM)
1194                 goal = PERCPU_ENOUGH_ROOM;
1195 #endif
1196         __per_cpu_shift = 0;
1197         for (size = 1UL; size < goal; size <<= 1UL)
1198                 __per_cpu_shift++;
1199
1200         /* Make sure the resulting __per_cpu_base value
1201          * will fit in the 43-bit sign extended IMMU
1202          * TSB register.
1203          */
1204         ptr = __alloc_bootmem(size * NR_CPUS, PAGE_SIZE,
1205                               (unsigned long) __per_cpu_start);
1206
1207         __per_cpu_base = ptr - __per_cpu_start;
1208
1209         if ((__per_cpu_shift < PAGE_SHIFT) ||
1210             (__per_cpu_base & ~PAGE_MASK) ||
1211             (__per_cpu_base != (((long) __per_cpu_base << 20) >> 20))) {
1212                 prom_printf("PER_CPU: Invalid layout, "
1213                             "ptr[%p] shift[%lx] base[%lx]\n",
1214                             ptr, __per_cpu_shift, __per_cpu_base);
1215                 prom_halt();
1216         }
1217
1218         for (i = 0; i < NR_CPUS; i++, ptr += size)
1219                 memcpy(ptr, __per_cpu_start, __per_cpu_end - __per_cpu_start);
1220
1221         /* Finally, load in the boot cpu's base value.
1222          * We abuse the IMMU TSB register for trap handler
1223          * entry and exit loading of %g5.  That is why it
1224          * has to be page aligned.
1225          */
1226         cpu_setup_percpu_base(hard_smp_processor_id());
1227 }