arch/sparc64/kernel/smp.c

   1 /* smp.c: Sparc64 SMP support.
   2  *
   3  * Copyright (C) 1997, 2007, 2008 David S. Miller (davem@davemloft.net)
   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/interrupt.h>
  14 #include <linux/kernel_stat.h>
  15 #include <linux/delay.h>
  16 #include <linux/init.h>
  17 #include <linux/spinlock.h>
  18 #include <linux/fs.h>
  19 #include <linux/seq_file.h>
  20 #include <linux/cache.h>
  21 #include <linux/jiffies.h>
  22 #include <linux/profile.h>
  23 #include <linux/lmb.h>
  24 #include <linux/cpu.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 #include <asm/hvtramp.h>
  33 #include <asm/io.h>
  34 #include <asm/timer.h>
  35
  36 #include <asm/irq.h>
  37 #include <asm/irq_regs.h>
  38 #include <asm/page.h>
  39 #include <asm/pgtable.h>
  40 #include <asm/oplib.h>
  41 #include <asm/uaccess.h>
  42 #include <asm/starfire.h>
  43 #include <asm/tlb.h>
  44 #include <asm/sections.h>
  45 #include <asm/prom.h>
  46 #include <asm/mdesc.h>
  47 #include <asm/ldc.h>
  48 #include <asm/hypervisor.h>
  49
  50 int sparc64_multi_core __read_mostly;
  51
  52 cpumask_t cpu_possible_map __read_mostly = CPU_MASK_NONE;
  53 cpumask_t cpu_online_map __read_mostly = CPU_MASK_NONE;
  54 DEFINE_PER_CPU(cpumask_t, cpu_sibling_map) = CPU_MASK_NONE;
  55 cpumask_t cpu_core_map[NR_CPUS] __read_mostly =
  56         { [0 ... NR_CPUS-1] = CPU_MASK_NONE };
  57
  58 EXPORT_SYMBOL(cpu_possible_map);
  59 EXPORT_SYMBOL(cpu_online_map);
  60 EXPORT_PER_CPU_SYMBOL(cpu_sibling_map);
  61 EXPORT_SYMBOL(cpu_core_map);
  62
  63 static cpumask_t smp_commenced_mask;
  64
  65 void smp_info(struct seq_file *m)
  66 {
  67         int i;
  68
  69         seq_printf(m, "State:\n");
  70         for_each_online_cpu(i)
  71                 seq_printf(m, "CPU%d:\t\tonline\n", i);
  72 }
  73
  74 void smp_bogo(struct seq_file *m)
  75 {
  76         int i;
  77
  78         for_each_online_cpu(i)
  79                 seq_printf(m,
  80                            "Cpu%dClkTck\t: %016lx\n",
  81                            i, cpu_data(i).clock_tick);
  82 }
  83
  84 extern void setup_sparc64_timer(void);
  85
  86 static volatile unsigned long callin_flag = 0;
  87
  88 void __cpuinit smp_callin(void)
  89 {
  90         int cpuid = hard_smp_processor_id();
  91
  92         __local_per_cpu_offset = __per_cpu_offset(cpuid);
  93
  94         if (tlb_type == hypervisor)
  95                 sun4v_ktsb_register();
  96
  97         __flush_tlb_all();
  98
  99         setup_sparc64_timer();
 100
 101         if (cheetah_pcache_forced_on)
 102                 cheetah_enable_pcache();
 103
 104         local_irq_enable();
 105
 106         callin_flag = 1;
 107         __asm__ __volatile__("membar #Sync\n\t"
 108                              "flush  %%g6" : : : "memory");
 109
 110         /* Clear this or we will die instantly when we
 111          * schedule back to this idler...
 112          */
 113         current_thread_info()->new_child = 0;
 114
 115         /* Attach to the address space of init_task. */
 116         atomic_inc(&init_mm.mm_count);
 117         current->active_mm = &init_mm;
 118
 119         /* inform the notifiers about the new cpu */
 120         notify_cpu_starting(cpuid);
 121
 122         while (!cpu_isset(cpuid, smp_commenced_mask))
 123                 rmb();
 124
 125         ipi_call_lock();
 126         cpu_set(cpuid, cpu_online_map);
 127         ipi_call_unlock();
 128
 129         /* idle thread is expected to have preempt disabled */
 130         preempt_disable();
 131 }
 132
 133 void cpu_panic(void)
 134 {
 135         printk("CPU[%d]: Returns from cpu_idle!\n", smp_processor_id());
 136         panic("SMP bolixed\n");
 137 }
 138
 139 /* This tick register synchronization scheme is taken entirely from
 140  * the ia64 port, see arch/ia64/kernel/smpboot.c for details and credit.
 141  *
 142  * The only change I've made is to rework it so that the master
 143  * initiates the synchonization instead of the slave. -DaveM
 144  */
 145
 146 #define MASTER  0
 147 #define SLAVE   (SMP_CACHE_BYTES/sizeof(unsigned long))
 148
 149 #define NUM_ROUNDS      64      /* magic value */
 150 #define NUM_ITERS       5       /* likewise */
 151
 152 static DEFINE_SPINLOCK(itc_sync_lock);
 153 static unsigned long go[SLAVE + 1];
 154
 155 #define DEBUG_TICK_SYNC 0
 156
 157 static inline long get_delta (long *rt, long *master)
 158 {
 159         unsigned long best_t0 = 0, best_t1 = ~0UL, best_tm = 0;
 160         unsigned long tcenter, t0, t1, tm;
 161         unsigned long i;
 162
 163         for (i = 0; i < NUM_ITERS; i++) {
 164                 t0 = tick_ops->get_tick();
 165                 go[MASTER] = 1;
 166                 membar_storeload();
 167                 while (!(tm = go[SLAVE]))
 168                         rmb();
 169                 go[SLAVE] = 0;
 170                 wmb();
 171                 t1 = tick_ops->get_tick();
 172
 173                 if (t1 - t0 < best_t1 - best_t0)
 174                         best_t0 = t0, best_t1 = t1, best_tm = tm;
 175         }
 176
 177         *rt = best_t1 - best_t0;
 178         *master = best_tm - best_t0;
 179
 180         /* average best_t0 and best_t1 without overflow: */
 181         tcenter = (best_t0/2 + best_t1/2);
 182         if (best_t0 % 2 + best_t1 % 2 == 2)
 183                 tcenter++;
 184         return tcenter - best_tm;
 185 }
 186
 187 void smp_synchronize_tick_client(void)
 188 {
 189         long i, delta, adj, adjust_latency = 0, done = 0;
 190         unsigned long flags, rt, master_time_stamp, bound;
 191 #if DEBUG_TICK_SYNC
 192         struct {
 193                 long rt;        /* roundtrip time */
 194                 long master;    /* master's timestamp */
 195                 long diff;      /* difference between midpoint and master's timestamp */
 196                 long lat;       /* estimate of itc adjustment latency */
 197         } t[NUM_ROUNDS];
 198 #endif
 199
 200         go[MASTER] = 1;
 201
 202         while (go[MASTER])
 203                 rmb();
 204
 205         local_irq_save(flags);
 206         {
 207                 for (i = 0; i < NUM_ROUNDS; i++) {
 208                         delta = get_delta(&rt, &master_time_stamp);
 209                         if (delta == 0) {
 210                                 done = 1;       /* let's lock on to this... */
 211                                 bound = rt;
 212                         }
 213
 214                         if (!done) {
 215                                 if (i > 0) {
 216                                         adjust_latency += -delta;
 217                                         adj = -delta + adjust_latency/4;
 218                                 } else
 219                                         adj = -delta;
 220
 221                                 tick_ops->add_tick(adj);
 222                         }
 223 #if DEBUG_TICK_SYNC
 224                         t[i].rt = rt;
 225                         t[i].master = master_time_stamp;
 226                         t[i].diff = delta;
 227                         t[i].lat = adjust_latency/4;
 228 #endif
 229                 }
 230         }
 231         local_irq_restore(flags);
 232
 233 #if DEBUG_TICK_SYNC
 234         for (i = 0; i < NUM_ROUNDS; i++)
 235                 printk("rt=%5ld master=%5ld diff=%5ld adjlat=%5ld\n",
 236                        t[i].rt, t[i].master, t[i].diff, t[i].lat);
 237 #endif
 238
 239         printk(KERN_INFO "CPU %d: synchronized TICK with master CPU "
 240                "(last diff %ld cycles, maxerr %lu cycles)\n",
 241                smp_processor_id(), delta, rt);
 242 }
 243
 244 static void smp_start_sync_tick_client(int cpu);
 245
 246 static void smp_synchronize_one_tick(int cpu)
 247 {
 248         unsigned long flags, i;
 249
 250         go[MASTER] = 0;
 251
 252         smp_start_sync_tick_client(cpu);
 253
 254         /* wait for client to be ready */
 255         while (!go[MASTER])
 256                 rmb();
 257
 258         /* now let the client proceed into his loop */
 259         go[MASTER] = 0;
 260         membar_storeload();
 261
 262         spin_lock_irqsave(&itc_sync_lock, flags);
 263         {
 264                 for (i = 0; i < NUM_ROUNDS*NUM_ITERS; i++) {
 265                         while (!go[MASTER])
 266                                 rmb();
 267                         go[MASTER] = 0;
 268                         wmb();
 269                         go[SLAVE] = tick_ops->get_tick();
 270                         membar_storeload();
 271                 }
 272         }
 273         spin_unlock_irqrestore(&itc_sync_lock, flags);
 274 }
 275
 276 #if defined(CONFIG_SUN_LDOMS) && defined(CONFIG_HOTPLUG_CPU)
 277 /* XXX Put this in some common place. XXX */
 278 static unsigned long kimage_addr_to_ra(void *p)
 279 {
 280         unsigned long val = (unsigned long) p;
 281
 282         return kern_base + (val - KERNBASE);
 283 }
 284
 285 static void ldom_startcpu_cpuid(unsigned int cpu, unsigned long thread_reg)
 286 {
 287         extern unsigned long sparc64_ttable_tl0;
 288         extern unsigned long kern_locked_tte_data;
 289         struct hvtramp_descr *hdesc;
 290         unsigned long trampoline_ra;
 291         struct trap_per_cpu *tb;
 292         u64 tte_vaddr, tte_data;
 293         unsigned long hv_err;
 294         int i;
 295
 296         hdesc = kzalloc(sizeof(*hdesc) +
 297                         (sizeof(struct hvtramp_mapping) *
 298                          num_kernel_image_mappings - 1),
 299                         GFP_KERNEL);
 300         if (!hdesc) {
 301                 printk(KERN_ERR "ldom_startcpu_cpuid: Cannot allocate "
 302                        "hvtramp_descr.\n");
 303                 return;
 304         }
 305
 306         hdesc->cpu = cpu;
 307         hdesc->num_mappings = num_kernel_image_mappings;
 308
 309         tb = &trap_block[cpu];
 310         tb->hdesc = hdesc;
 311
 312         hdesc->fault_info_va = (unsigned long) &tb->fault_info;
 313         hdesc->fault_info_pa = kimage_addr_to_ra(&tb->fault_info);
 314
 315         hdesc->thread_reg = thread_reg;
 316
 317         tte_vaddr = (unsigned long) KERNBASE;
 318         tte_data = kern_locked_tte_data;
 319
 320         for (i = 0; i < hdesc->num_mappings; i++) {
 321                 hdesc->maps[i].vaddr = tte_vaddr;
 322                 hdesc->maps[i].tte   = tte_data;
 323                 tte_vaddr += 0x400000;
 324                 tte_data  += 0x400000;
 325         }
 326
 327         trampoline_ra = kimage_addr_to_ra(hv_cpu_startup);
 328
 329         hv_err = sun4v_cpu_start(cpu, trampoline_ra,
 330                                  kimage_addr_to_ra(&sparc64_ttable_tl0),
 331                                  __pa(hdesc));
 332         if (hv_err)
 333                 printk(KERN_ERR "ldom_startcpu_cpuid: sun4v_cpu_start() "
 334                        "gives error %lu\n", hv_err);
 335 }
 336 #endif
 337
 338 extern unsigned long sparc64_cpu_startup;
 339
 340 /* The OBP cpu startup callback truncates the 3rd arg cookie to
 341  * 32-bits (I think) so to be safe we have it read the pointer
 342  * contained here so we work on >4GB machines. -DaveM
 343  */
 344 static struct thread_info *cpu_new_thread = NULL;
 345
 346 static int __devinit smp_boot_one_cpu(unsigned int cpu)
 347 {
 348         struct trap_per_cpu *tb = &trap_block[cpu];
 349         unsigned long entry =
 350                 (unsigned long)(&sparc64_cpu_startup);
 351         unsigned long cookie =
 352                 (unsigned long)(&cpu_new_thread);
 353         struct task_struct *p;
 354         int timeout, ret;
 355
 356         p = fork_idle(cpu);
 357         if (IS_ERR(p))
 358                 return PTR_ERR(p);
 359         callin_flag = 0;
 360         cpu_new_thread = task_thread_info(p);
 361
 362         if (tlb_type == hypervisor) {
 363 #if defined(CONFIG_SUN_LDOMS) && defined(CONFIG_HOTPLUG_CPU)
 364                 if (ldom_domaining_enabled)
 365                         ldom_startcpu_cpuid(cpu,
 366                                             (unsigned long) cpu_new_thread);
 367                 else
 368 #endif
 369                         prom_startcpu_cpuid(cpu, entry, cookie);
 370         } else {
 371                 struct device_node *dp = of_find_node_by_cpuid(cpu);
 372
 373                 prom_startcpu(dp->node, entry, cookie);
 374         }
 375
 376         for (timeout = 0; timeout < 50000; timeout++) {
 377                 if (callin_flag)
 378                         break;
 379                 udelay(100);
 380         }
 381
 382         if (callin_flag) {
 383                 ret = 0;
 384         } else {
 385                 printk("Processor %d is stuck.\n", cpu);
 386                 ret = -ENODEV;
 387         }
 388         cpu_new_thread = NULL;
 389
 390         if (tb->hdesc) {
 391                 kfree(tb->hdesc);
 392                 tb->hdesc = NULL;
 393         }
 394
 395         return ret;
 396 }
 397
 398 static void spitfire_xcall_helper(u64 data0, u64 data1, u64 data2, u64 pstate, unsigned long cpu)
 399 {
 400         u64 result, target;
 401         int stuck, tmp;
 402
 403         if (this_is_starfire) {
 404                 /* map to real upaid */
 405                 cpu = (((cpu & 0x3c) << 1) |
 406                         ((cpu & 0x40) >> 4) |
 407                         (cpu & 0x3));
 408         }
 409
 410         target = (cpu << 14) | 0x70;
 411 again:
 412         /* Ok, this is the real Spitfire Errata #54.
 413          * One must read back from a UDB internal register
 414          * after writes to the UDB interrupt dispatch, but
 415          * before the membar Sync for that write.
 416          * So we use the high UDB control register (ASI 0x7f,
 417          * ADDR 0x20) for the dummy read. -DaveM
 418          */
 419         tmp = 0x40;
 420         __asm__ __volatile__(
 421         "wrpr   %1, %2, %%pstate\n\t"
 422         "stxa   %4, [%0] %3\n\t"
 423         "stxa   %5, [%0+%8] %3\n\t"
 424         "add    %0, %8, %0\n\t"
 425         "stxa   %6, [%0+%8] %3\n\t"
 426         "membar #Sync\n\t"
 427         "stxa   %%g0, [%7] %3\n\t"
 428         "membar #Sync\n\t"
 429         "mov    0x20, %%g1\n\t"
 430         "ldxa   [%%g1] 0x7f, %%g0\n\t"
 431         "membar #Sync"
 432         : "=r" (tmp)
 433         : "r" (pstate), "i" (PSTATE_IE), "i" (ASI_INTR_W),
 434           "r" (data0), "r" (data1), "r" (data2), "r" (target),
 435           "r" (0x10), "0" (tmp)
 436         : "g1");
 437
 438         /* NOTE: PSTATE_IE is still clear. */
 439         stuck = 100000;
 440         do {
 441                 __asm__ __volatile__("ldxa [%%g0] %1, %0"
 442                         : "=r" (result)
 443                         : "i" (ASI_INTR_DISPATCH_STAT));
 444                 if (result == 0) {
 445                         __asm__ __volatile__("wrpr %0, 0x0, %%pstate"
 446                                              : : "r" (pstate));
 447                         return;
 448                 }
 449                 stuck -= 1;
 450                 if (stuck == 0)
 451                         break;
 452         } while (result & 0x1);
 453         __asm__ __volatile__("wrpr %0, 0x0, %%pstate"
 454                              : : "r" (pstate));
 455         if (stuck == 0) {
 456                 printk("CPU[%d]: mondo stuckage result[%016lx]\n",
 457                        smp_processor_id(), result);
 458         } else {
 459                 udelay(2);
 460                 goto again;
 461         }
 462 }
 463
 464 static void spitfire_xcall_deliver(struct trap_per_cpu *tb, int cnt)
 465 {
 466         u64 *mondo, data0, data1, data2;
 467         u16 *cpu_list;
 468         u64 pstate;
 469         int i;
 470
 471         __asm__ __volatile__("rdpr %%pstate, %0" : "=r" (pstate));
 472         cpu_list = __va(tb->cpu_list_pa);
 473         mondo = __va(tb->cpu_mondo_block_pa);
 474         data0 = mondo[0];
 475         data1 = mondo[1];
 476         data2 = mondo[2];
 477         for (i = 0; i < cnt; i++)
 478                 spitfire_xcall_helper(data0, data1, data2, pstate, cpu_list[i]);
 479 }
 480
 481 /* Cheetah now allows to send the whole 64-bytes of data in the interrupt
 482  * packet, but we have no use for that.  However we do take advantage of
 483  * the new pipelining feature (ie. dispatch to multiple cpus simultaneously).
 484  */
 485 static void cheetah_xcall_deliver(struct trap_per_cpu *tb, int cnt)
 486 {
 487         int nack_busy_id, is_jbus, need_more;
 488         u64 *mondo, pstate, ver, busy_mask;
 489         u16 *cpu_list;
 490
 491         cpu_list = __va(tb->cpu_list_pa);
 492         mondo = __va(tb->cpu_mondo_block_pa);
 493
 494         /* Unfortunately, someone at Sun had the brilliant idea to make the
 495          * busy/nack fields hard-coded by ITID number for this Ultra-III
 496          * derivative processor.
 497          */
 498         __asm__ ("rdpr %%ver, %0" : "=r" (ver));
 499         is_jbus = ((ver >> 32) == __JALAPENO_ID ||
 500                    (ver >> 32) == __SERRANO_ID);
 501
 502         __asm__ __volatile__("rdpr %%pstate, %0" : "=r" (pstate));
 503
 504 retry:
 505         need_more = 0;
 506         __asm__ __volatile__("wrpr %0, %1, %%pstate\n\t"
 507                              : : "r" (pstate), "i" (PSTATE_IE));
 508
 509         /* Setup the dispatch data registers. */
 510         __asm__ __volatile__("stxa      %0, [%3] %6\n\t"
 511                              "stxa      %1, [%4] %6\n\t"
 512                              "stxa      %2, [%5] %6\n\t"
 513                              "membar    #Sync\n\t"
 514                              : /* no outputs */
 515                              : "r" (mondo[0]), "r" (mondo[1]), "r" (mondo[2]),
 516                                "r" (0x40), "r" (0x50), "r" (0x60),
 517                                "i" (ASI_INTR_W));
 518
 519         nack_busy_id = 0;
 520         busy_mask = 0;
 521         {
 522                 int i;
 523
 524                 for (i = 0; i < cnt; i++) {
 525                         u64 target, nr;
 526
 527                         nr = cpu_list[i];
 528                         if (nr == 0xffff)
 529                                 continue;
 530
 531                         target = (nr << 14) | 0x70;
 532                         if (is_jbus) {
 533                                 busy_mask |= (0x1UL << (nr * 2));
 534                         } else {
 535                                 target |= (nack_busy_id << 24);
 536                                 busy_mask |= (0x1UL <<
 537                                               (nack_busy_id * 2));
 538                         }
 539                         __asm__ __volatile__(
 540                                 "stxa   %%g0, [%0] %1\n\t"
 541                                 "membar #Sync\n\t"
 542                                 : /* no outputs */
 543                                 : "r" (target), "i" (ASI_INTR_W));
 544                         nack_busy_id++;
 545                         if (nack_busy_id == 32) {
 546                                 need_more = 1;
 547                                 break;
 548                         }
 549                 }
 550         }
 551
 552         /* Now, poll for completion. */
 553         {
 554                 u64 dispatch_stat, nack_mask;
 555                 long stuck;
 556
 557                 stuck = 100000 * nack_busy_id;
 558                 nack_mask = busy_mask << 1;
 559                 do {
 560                         __asm__ __volatile__("ldxa      [%%g0] %1, %0"
 561                                              : "=r" (dispatch_stat)
 562                                              : "i" (ASI_INTR_DISPATCH_STAT));
 563                         if (!(dispatch_stat & (busy_mask | nack_mask))) {
 564                                 __asm__ __volatile__("wrpr %0, 0x0, %%pstate"
 565                                                      : : "r" (pstate));
 566                                 if (unlikely(need_more)) {
 567                                         int i, this_cnt = 0;
 568                                         for (i = 0; i < cnt; i++) {
 569                                                 if (cpu_list[i] == 0xffff)
 570                                                         continue;
 571                                                 cpu_list[i] = 0xffff;
 572                                                 this_cnt++;
 573                                                 if (this_cnt == 32)
 574                                                         break;
 575                                         }
 576                                         goto retry;
 577                                 }
 578                                 return;
 579                         }
 580                         if (!--stuck)
 581                                 break;
 582                 } while (dispatch_stat & busy_mask);
 583
 584                 __asm__ __volatile__("wrpr %0, 0x0, %%pstate"
 585                                      : : "r" (pstate));
 586
 587                 if (dispatch_stat & busy_mask) {
 588                         /* Busy bits will not clear, continue instead
 589                          * of freezing up on this cpu.
 590                          */
 591                         printk("CPU[%d]: mondo stuckage result[%016lx]\n",
 592                                smp_processor_id(), dispatch_stat);
 593                 } else {
 594                         int i, this_busy_nack = 0;
 595
 596                         /* Delay some random time with interrupts enabled
 597                          * to prevent deadlock.
 598                          */
 599                         udelay(2 * nack_busy_id);
 600
 601                         /* Clear out the mask bits for cpus which did not
 602                          * NACK us.
 603                          */
 604                         for (i = 0; i < cnt; i++) {
 605                                 u64 check_mask, nr;
 606
 607                                 nr = cpu_list[i];
 608                                 if (nr == 0xffff)
 609                                         continue;
 610
 611                                 if (is_jbus)
 612                                         check_mask = (0x2UL << (2*nr));
 613                                 else
 614                                         check_mask = (0x2UL <<
 615                                                       this_busy_nack);
 616                                 if ((dispatch_stat & check_mask) == 0)
 617                                         cpu_list[i] = 0xffff;
 618                                 this_busy_nack += 2;
 619                                 if (this_busy_nack == 64)
 620                                         break;
 621                         }
 622
 623                         goto retry;
 624                 }
 625         }
 626 }
 627
 628 /* Multi-cpu list version.  */
 629 static void hypervisor_xcall_deliver(struct trap_per_cpu *tb, int cnt)
 630 {
 631         int retries, this_cpu, prev_sent, i, saw_cpu_error;
 632         unsigned long status;
 633         u16 *cpu_list;
 634
 635         this_cpu = smp_processor_id();
 636
 637         cpu_list = __va(tb->cpu_list_pa);
 638
 639         saw_cpu_error = 0;
 640         retries = 0;
 641         prev_sent = 0;
 642         do {
 643                 int forward_progress, n_sent;
 644
 645                 status = sun4v_cpu_mondo_send(cnt,
 646                                               tb->cpu_list_pa,
 647                                               tb->cpu_mondo_block_pa);
 648
 649                 /* HV_EOK means all cpus received the xcall, we're done.  */
 650                 if (likely(status == HV_EOK))
 651                         break;
 652
 653                 /* First, see if we made any forward progress.
 654                  *
 655                  * The hypervisor indicates successful sends by setting
 656                  * cpu list entries to the value 0xffff.
 657                  */
 658                 n_sent = 0;
 659                 for (i = 0; i < cnt; i++) {
 660                         if (likely(cpu_list[i] == 0xffff))
 661                                 n_sent++;
 662                 }
 663
 664                 forward_progress = 0;
 665                 if (n_sent > prev_sent)
 666                         forward_progress = 1;
 667
 668                 prev_sent = n_sent;
 669
 670                 /* If we get a HV_ECPUERROR, then one or more of the cpus
 671                  * in the list are in error state.  Use the cpu_state()
 672                  * hypervisor call to find out which cpus are in error state.
 673                  */
 674                 if (unlikely(status == HV_ECPUERROR)) {
 675                         for (i = 0; i < cnt; i++) {
 676                                 long err;
 677                                 u16 cpu;
 678
 679                                 cpu = cpu_list[i];
 680                                 if (cpu == 0xffff)
 681                                         continue;
 682
 683                                 err = sun4v_cpu_state(cpu);
 684                                 if (err == HV_CPU_STATE_ERROR) {
 685                                         saw_cpu_error = (cpu + 1);
 686                                         cpu_list[i] = 0xffff;
 687                                 }
 688                         }
 689                 } else if (unlikely(status != HV_EWOULDBLOCK))
 690                         goto fatal_mondo_error;
 691
 692                 /* Don't bother rewriting the CPU list, just leave the
 693                  * 0xffff and non-0xffff entries in there and the
 694                  * hypervisor will do the right thing.
 695                  *
 696                  * Only advance timeout state if we didn't make any
 697                  * forward progress.
 698                  */
 699                 if (unlikely(!forward_progress)) {
 700                         if (unlikely(++retries > 10000))
 701                                 goto fatal_mondo_timeout;
 702
 703                         /* Delay a little bit to let other cpus catch up
 704                          * on their cpu mondo queue work.
 705                          */
 706                         udelay(2 * cnt);
 707                 }
 708         } while (1);
 709
 710         if (unlikely(saw_cpu_error))
 711                 goto fatal_mondo_cpu_error;
 712
 713         return;
 714
 715 fatal_mondo_cpu_error:
 716         printk(KERN_CRIT "CPU[%d]: SUN4V mondo cpu error, some target cpus "
 717                "(including %d) were in error state\n",
 718                this_cpu, saw_cpu_error - 1);
 719         return;
 720
 721 fatal_mondo_timeout:
 722         printk(KERN_CRIT "CPU[%d]: SUN4V mondo timeout, no forward "
 723                " progress after %d retries.\n",
 724                this_cpu, retries);
 725         goto dump_cpu_list_and_out;
 726
 727 fatal_mondo_error:
 728         printk(KERN_CRIT "CPU[%d]: Unexpected SUN4V mondo error %lu\n",
 729                this_cpu, status);
 730         printk(KERN_CRIT "CPU[%d]: Args were cnt(%d) cpulist_pa(%lx) "
 731                "mondo_block_pa(%lx)\n",
 732                this_cpu, cnt, tb->cpu_list_pa, tb->cpu_mondo_block_pa);
 733
 734 dump_cpu_list_and_out:
 735         printk(KERN_CRIT "CPU[%d]: CPU list [ ", this_cpu);
 736         for (i = 0; i < cnt; i++)
 737                 printk("%u ", cpu_list[i]);
 738         printk("]\n");
 739 }
 740
 741 static void (*xcall_deliver_impl)(struct trap_per_cpu *, int);
 742
 743 static void xcall_deliver(u64 data0, u64 data1, u64 data2, const cpumask_t *mask)
 744 {
 745         struct trap_per_cpu *tb;
 746         int this_cpu, i, cnt;
 747         unsigned long flags;
 748         u16 *cpu_list;
 749         u64 *mondo;
 750
 751         /* We have to do this whole thing with interrupts fully disabled.
 752          * Otherwise if we send an xcall from interrupt context it will
 753          * corrupt both our mondo block and cpu list state.
 754          *
 755          * One consequence of this is that we cannot use timeout mechanisms
 756          * that depend upon interrupts being delivered locally.  So, for
 757          * example, we cannot sample jiffies and expect it to advance.
 758          *
 759          * Fortunately, udelay() uses %stick/%tick so we can use that.
 760          */
 761         local_irq_save(flags);
 762
 763         this_cpu = smp_processor_id();
 764         tb = &trap_block[this_cpu];
 765
 766         mondo = __va(tb->cpu_mondo_block_pa);
 767         mondo[0] = data0;
 768         mondo[1] = data1;
 769         mondo[2] = data2;
 770         wmb();
 771
 772         cpu_list = __va(tb->cpu_list_pa);
 773
 774         /* Setup the initial cpu list.  */
 775         cnt = 0;
 776         for_each_cpu_mask_nr(i, *mask) {
 777                 if (i == this_cpu || !cpu_online(i))
 778                         continue;
 779                 cpu_list[cnt++] = i;
 780         }
 781
 782         if (cnt)
 783                 xcall_deliver_impl(tb, cnt);
 784
 785         local_irq_restore(flags);
 786 }
 787
 788 /* Send cross call to all processors mentioned in MASK_P
 789  * except self.  Really, there are only two cases currently,
 790  * "&cpu_online_map" and "&mm->cpu_vm_mask".
 791  */
 792 static void smp_cross_call_masked(unsigned long *func, u32 ctx, u64 data1, u64 data2, const cpumask_t *mask)
 793 {
 794         u64 data0 = (((u64)ctx)<<32 | (((u64)func) & 0xffffffff));
 795
 796         xcall_deliver(data0, data1, data2, mask);
 797 }
 798
 799 /* Send cross call to all processors except self. */
 800 static void smp_cross_call(unsigned long *func, u32 ctx, u64 data1, u64 data2)
 801 {
 802         smp_cross_call_masked(func, ctx, data1, data2, &cpu_online_map);
 803 }
 804
 805 extern unsigned long xcall_sync_tick;
 806
 807 static void smp_start_sync_tick_client(int cpu)
 808 {
 809         xcall_deliver((u64) &xcall_sync_tick, 0, 0,
 810                       &cpumask_of_cpu(cpu));
 811 }
 812
 813 extern unsigned long xcall_call_function;
 814
 815 void arch_send_call_function_ipi(cpumask_t mask)
 816 {
 817         xcall_deliver((u64) &xcall_call_function, 0, 0, &mask);
 818 }
 819
 820 extern unsigned long xcall_call_function_single;
 821
 822 void arch_send_call_function_single_ipi(int cpu)
 823 {
 824         xcall_deliver((u64) &xcall_call_function_single, 0, 0,
 825                       &cpumask_of_cpu(cpu));
 826 }
 827
 828 void smp_call_function_client(int irq, struct pt_regs *regs)
 829 {
 830         clear_softint(1 << irq);
 831         generic_smp_call_function_interrupt();
 832 }
 833
 834 void smp_call_function_single_client(int irq, struct pt_regs *regs)
 835 {
 836         clear_softint(1 << irq);
 837         generic_smp_call_function_single_interrupt();
 838 }
 839
 840 static void tsb_sync(void *info)
 841 {
 842         struct trap_per_cpu *tp = &trap_block[raw_smp_processor_id()];
 843         struct mm_struct *mm = info;
 844
 845         /* It is not valid to test "currrent->active_mm == mm" here.
 846          *
 847          * The value of "current" is not changed atomically with
 848          * switch_mm().  But that's OK, we just need to check the
 849          * current cpu's trap block PGD physical address.
 850          */
 851         if (tp->pgd_paddr == __pa(mm->pgd))
 852                 tsb_context_switch(mm);
 853 }
 854
 855 void smp_tsb_sync(struct mm_struct *mm)
 856 {
 857         smp_call_function_mask(mm->cpu_vm_mask, tsb_sync, mm, 1);
 858 }
 859
 860 extern unsigned long xcall_flush_tlb_mm;
 861 extern unsigned long xcall_flush_tlb_pending;
 862 extern unsigned long xcall_flush_tlb_kernel_range;
 863 extern unsigned long xcall_fetch_glob_regs;
 864 extern unsigned long xcall_receive_signal;
 865 extern unsigned long xcall_new_mmu_context_version;
 866 #ifdef CONFIG_KGDB
 867 extern unsigned long xcall_kgdb_capture;
 868 #endif
 869
 870 #ifdef DCACHE_ALIASING_POSSIBLE
 871 extern unsigned long xcall_flush_dcache_page_cheetah;
 872 #endif
 873 extern unsigned long xcall_flush_dcache_page_spitfire;
 874
 875 #ifdef CONFIG_DEBUG_DCFLUSH
 876 extern atomic_t dcpage_flushes;
 877 extern atomic_t dcpage_flushes_xcall;
 878 #endif
 879
 880 static inline void __local_flush_dcache_page(struct page *page)
 881 {
 882 #ifdef DCACHE_ALIASING_POSSIBLE
 883         __flush_dcache_page(page_address(page),
 884                             ((tlb_type == spitfire) &&
 885                              page_mapping(page) != NULL));
 886 #else
 887         if (page_mapping(page) != NULL &&
 888             tlb_type == spitfire)
 889                 __flush_icache_page(__pa(page_address(page)));
 890 #endif
 891 }
 892
 893 void smp_flush_dcache_page_impl(struct page *page, int cpu)
 894 {
 895         int this_cpu;
 896
 897         if (tlb_type == hypervisor)
 898                 return;
 899
 900 #ifdef CONFIG_DEBUG_DCFLUSH
 901         atomic_inc(&dcpage_flushes);
 902 #endif
 903
 904         this_cpu = get_cpu();
 905
 906         if (cpu == this_cpu) {
 907                 __local_flush_dcache_page(page);
 908         } else if (cpu_online(cpu)) {
 909                 void *pg_addr = page_address(page);
 910                 u64 data0 = 0;
 911
 912                 if (tlb_type == spitfire) {
 913                         data0 = ((u64)&xcall_flush_dcache_page_spitfire);
 914                         if (page_mapping(page) != NULL)
 915                                 data0 |= ((u64)1 << 32);
 916                 } else if (tlb_type == cheetah || tlb_type == cheetah_plus) {
 917 #ifdef DCACHE_ALIASING_POSSIBLE
 918                         data0 = ((u64)&xcall_flush_dcache_page_cheetah);
 919 #endif
 920                 }
 921                 if (data0) {
 922                         xcall_deliver(data0, __pa(pg_addr),
 923                                       (u64) pg_addr, &cpumask_of_cpu(cpu));
 924 #ifdef CONFIG_DEBUG_DCFLUSH
 925                         atomic_inc(&dcpage_flushes_xcall);
 926 #endif
 927                 }
 928         }
 929
 930         put_cpu();
 931 }
 932
 933 void flush_dcache_page_all(struct mm_struct *mm, struct page *page)
 934 {
 935         void *pg_addr;
 936         int this_cpu;
 937         u64 data0;
 938
 939         if (tlb_type == hypervisor)
 940                 return;
 941
 942         this_cpu = get_cpu();
 943
 944 #ifdef CONFIG_DEBUG_DCFLUSH
 945         atomic_inc(&dcpage_flushes);
 946 #endif
 947         data0 = 0;
 948         pg_addr = page_address(page);
 949         if (tlb_type == spitfire) {
 950                 data0 = ((u64)&xcall_flush_dcache_page_spitfire);
 951                 if (page_mapping(page) != NULL)
 952                         data0 |= ((u64)1 << 32);
 953         } else if (tlb_type == cheetah || tlb_type == cheetah_plus) {
 954 #ifdef DCACHE_ALIASING_POSSIBLE
 955                 data0 = ((u64)&xcall_flush_dcache_page_cheetah);
 956 #endif
 957         }
 958         if (data0) {
 959                 xcall_deliver(data0, __pa(pg_addr),
 960                               (u64) pg_addr, &cpu_online_map);
 961 #ifdef CONFIG_DEBUG_DCFLUSH
 962                 atomic_inc(&dcpage_flushes_xcall);
 963 #endif
 964         }
 965         __local_flush_dcache_page(page);
 966
 967         put_cpu();
 968 }
 969
 970 void smp_new_mmu_context_version_client(int irq, struct pt_regs *regs)
 971 {
 972         struct mm_struct *mm;
 973         unsigned long flags;
 974
 975         clear_softint(1 << irq);
 976
 977         /* See if we need to allocate a new TLB context because
 978          * the version of the one we are using is now out of date.
 979          */
 980         mm = current->active_mm;
 981         if (unlikely(!mm || (mm == &init_mm)))
 982                 return;
 983
 984         spin_lock_irqsave(&mm->context.lock, flags);
 985
 986         if (unlikely(!CTX_VALID(mm->context)))
 987                 get_new_mmu_context(mm);
 988
 989         spin_unlock_irqrestore(&mm->context.lock, flags);
 990
 991         load_secondary_context(mm);
 992         __flush_tlb_mm(CTX_HWBITS(mm->context),
 993                        SECONDARY_CONTEXT);
 994 }
 995
 996 void smp_new_mmu_context_version(void)
 997 {
 998         smp_cross_call(&xcall_new_mmu_context_version, 0, 0, 0);
 999 }
1000
1001 #ifdef CONFIG_KGDB
1002 void kgdb_roundup_cpus(unsigned long flags)
1003 {
1004         smp_cross_call(&xcall_kgdb_capture, 0, 0, 0);
1005 }
1006 #endif
1007
1008 void smp_fetch_global_regs(void)
1009 {
1010         smp_cross_call(&xcall_fetch_glob_regs, 0, 0, 0);
1011 }
1012
1013 /* We know that the window frames of the user have been flushed
1014  * to the stack before we get here because all callers of us
1015  * are flush_tlb_*() routines, and these run after flush_cache_*()
1016  * which performs the flushw.
1017  *
1018  * The SMP TLB coherency scheme we use works as follows:
1019  *
1020  * 1) mm->cpu_vm_mask is a bit mask of which cpus an address
1021  *    space has (potentially) executed on, this is the heuristic
1022  *    we use to avoid doing cross calls.
1023  *
1024  *    Also, for flushing from kswapd and also for clones, we
1025  *    use cpu_vm_mask as the list of cpus to make run the TLB.
1026  *
1027  * 2) TLB context numbers are shared globally across all processors
1028  *    in the system, this allows us to play several games to avoid
1029  *    cross calls.
1030  *
1031  *    One invariant is that when a cpu switches to a process, and
1032  *    that processes tsk->active_mm->cpu_vm_mask does not have the
1033  *    current cpu's bit set, that tlb context is flushed locally.
1034  *
1035  *    If the address space is non-shared (ie. mm->count == 1) we avoid
1036  *    cross calls when we want to flush the currently running process's
1037  *    tlb state.  This is done by clearing all cpu bits except the current
1038  *    processor's in current->active_mm->cpu_vm_mask and performing the
1039  *    flush locally only.  This will force any subsequent cpus which run
1040  *    this task to flush the context from the local tlb if the process
1041  *    migrates to another cpu (again).
1042  *
1043  * 3) For shared address spaces (threads) and swapping we bite the
1044  *    bullet for most cases and perform the cross call (but only to
1045  *    the cpus listed in cpu_vm_mask).
1046  *
1047  *    The performance gain from "optimizing" away the cross call for threads is
1048  *    questionable (in theory the big win for threads is the massive sharing of
1049  *    address space state across processors).
1050  */
1051
1052 /* This currently is only used by the hugetlb arch pre-fault
1053  * hook on UltraSPARC-III+ and later when changing the pagesize
1054  * bits of the context register for an address space.
1055  */
1056 void smp_flush_tlb_mm(struct mm_struct *mm)
1057 {
1058         u32 ctx = CTX_HWBITS(mm->context);
1059         int cpu = get_cpu();
1060
1061         if (atomic_read(&mm->mm_users) == 1) {
1062                 mm->cpu_vm_mask = cpumask_of_cpu(cpu);
1063                 goto local_flush_and_out;
1064         }
1065
1066         smp_cross_call_masked(&xcall_flush_tlb_mm,
1067                               ctx, 0, 0,
1068                               &mm->cpu_vm_mask);
1069
1070 local_flush_and_out:
1071         __flush_tlb_mm(ctx, SECONDARY_CONTEXT);
1072
1073         put_cpu();
1074 }
1075
1076 void smp_flush_tlb_pending(struct mm_struct *mm, unsigned long nr, unsigned long *vaddrs)
1077 {
1078         u32 ctx = CTX_HWBITS(mm->context);
1079         int cpu = get_cpu();
1080
1081         if (mm == current->active_mm && atomic_read(&mm->mm_users) == 1)
1082                 mm->cpu_vm_mask = cpumask_of_cpu(cpu);
1083         else
1084                 smp_cross_call_masked(&xcall_flush_tlb_pending,
1085                                       ctx, nr, (unsigned long) vaddrs,
1086                                       &mm->cpu_vm_mask);
1087
1088         __flush_tlb_pending(ctx, nr, vaddrs);
1089
1090         put_cpu();
1091 }
1092
1093 void smp_flush_tlb_kernel_range(unsigned long start, unsigned long end)
1094 {
1095         start &= PAGE_MASK;
1096         end    = PAGE_ALIGN(end);
1097         if (start != end) {
1098                 smp_cross_call(&xcall_flush_tlb_kernel_range,
1099                                0, start, end);
1100
1101                 __flush_tlb_kernel_range(start, end);
1102         }
1103 }
1104
1105 /* CPU capture. */
1106 /* #define CAPTURE_DEBUG */
1107 extern unsigned long xcall_capture;
1108
1109 static atomic_t smp_capture_depth = ATOMIC_INIT(0);
1110 static atomic_t smp_capture_registry = ATOMIC_INIT(0);
1111 static unsigned long penguins_are_doing_time;
1112
1113 void smp_capture(void)
1114 {
1115         int result = atomic_add_ret(1, &smp_capture_depth);
1116
1117         if (result == 1) {
1118                 int ncpus = num_online_cpus();
1119
1120 #ifdef CAPTURE_DEBUG
1121                 printk("CPU[%d]: Sending penguins to jail...",
1122                        smp_processor_id());
1123 #endif
1124                 penguins_are_doing_time = 1;
1125                 membar_storestore_loadstore();
1126                 atomic_inc(&smp_capture_registry);
1127                 smp_cross_call(&xcall_capture, 0, 0, 0);
1128                 while (atomic_read(&smp_capture_registry) != ncpus)
1129                         rmb();
1130 #ifdef CAPTURE_DEBUG
1131                 printk("done\n");
1132 #endif
1133         }
1134 }
1135
1136 void smp_release(void)
1137 {
1138         if (atomic_dec_and_test(&smp_capture_depth)) {
1139 #ifdef CAPTURE_DEBUG
1140                 printk("CPU[%d]: Giving pardon to "
1141                        "imprisoned penguins\n",
1142                        smp_processor_id());
1143 #endif
1144                 penguins_are_doing_time = 0;
1145                 membar_storeload_storestore();
1146                 atomic_dec(&smp_capture_registry);
1147         }
1148 }
1149
1150 /* Imprisoned penguins run with %pil == 15, but PSTATE_IE set, so they
1151  * can service tlb flush xcalls...
1152  */
1153 extern void prom_world(int);
1154
1155 void smp_penguin_jailcell(int irq, struct pt_regs *regs)
1156 {
1157         clear_softint(1 << irq);
1158
1159         preempt_disable();
1160
1161         __asm__ __volatile__("flushw");
1162         prom_world(1);
1163         atomic_inc(&smp_capture_registry);
1164         membar_storeload_storestore();
1165         while (penguins_are_doing_time)
1166                 rmb();
1167         atomic_dec(&smp_capture_registry);
1168         prom_world(0);
1169
1170         preempt_enable();
1171 }
1172
1173 /* /proc/profile writes can call this, don't __init it please. */
1174 int setup_profiling_timer(unsigned int multiplier)
1175 {
1176         return -EINVAL;
1177 }
1178
1179 void __init smp_prepare_cpus(unsigned int max_cpus)
1180 {
1181 }
1182
1183 void __devinit smp_prepare_boot_cpu(void)
1184 {
1185 }
1186
1187 void __init smp_setup_processor_id(void)
1188 {
1189         if (tlb_type == spitfire)
1190                 xcall_deliver_impl = spitfire_xcall_deliver;
1191         else if (tlb_type == cheetah || tlb_type == cheetah_plus)
1192                 xcall_deliver_impl = cheetah_xcall_deliver;
1193         else
1194                 xcall_deliver_impl = hypervisor_xcall_deliver;
1195 }
1196
1197 void __devinit smp_fill_in_sib_core_maps(void)
1198 {
1199         unsigned int i;
1200
1201         for_each_present_cpu(i) {
1202                 unsigned int j;
1203
1204                 cpus_clear(cpu_core_map[i]);
1205                 if (cpu_data(i).core_id == 0) {
1206                         cpu_set(i, cpu_core_map[i]);
1207                         continue;
1208                 }
1209
1210                 for_each_present_cpu(j) {
1211                         if (cpu_data(i).core_id ==
1212                             cpu_data(j).core_id)
1213                                 cpu_set(j, cpu_core_map[i]);
1214                 }
1215         }
1216
1217         for_each_present_cpu(i) {
1218                 unsigned int j;
1219
1220                 cpus_clear(per_cpu(cpu_sibling_map, i));
1221                 if (cpu_data(i).proc_id == -1) {
1222                         cpu_set(i, per_cpu(cpu_sibling_map, i));
1223                         continue;
1224                 }
1225
1226                 for_each_present_cpu(j) {
1227                         if (cpu_data(i).proc_id ==
1228                             cpu_data(j).proc_id)
1229                                 cpu_set(j, per_cpu(cpu_sibling_map, i));
1230                 }
1231         }
1232 }
1233
1234 int __cpuinit __cpu_up(unsigned int cpu)
1235 {
1236         int ret = smp_boot_one_cpu(cpu);
1237
1238         if (!ret) {
1239                 cpu_set(cpu, smp_commenced_mask);
1240                 while (!cpu_isset(cpu, cpu_online_map))
1241                         mb();
1242                 if (!cpu_isset(cpu, cpu_online_map)) {
1243                         ret = -ENODEV;
1244                 } else {
1245                         /* On SUN4V, writes to %tick and %stick are
1246                          * not allowed.
1247                          */
1248                         if (tlb_type != hypervisor)
1249                                 smp_synchronize_one_tick(cpu);
1250                 }
1251         }
1252         return ret;
1253 }
1254
1255 #ifdef CONFIG_HOTPLUG_CPU
1256 void cpu_play_dead(void)
1257 {
1258         int cpu = smp_processor_id();
1259         unsigned long pstate;
1260
1261         idle_task_exit();
1262
1263         if (tlb_type == hypervisor) {
1264                 struct trap_per_cpu *tb = &trap_block[cpu];
1265
1266                 sun4v_cpu_qconf(HV_CPU_QUEUE_CPU_MONDO,
1267                                 tb->cpu_mondo_pa, 0);
1268                 sun4v_cpu_qconf(HV_CPU_QUEUE_DEVICE_MONDO,
1269                                 tb->dev_mondo_pa, 0);
1270                 sun4v_cpu_qconf(HV_CPU_QUEUE_RES_ERROR,
1271                                 tb->resum_mondo_pa, 0);
1272                 sun4v_cpu_qconf(HV_CPU_QUEUE_NONRES_ERROR,
1273                                 tb->nonresum_mondo_pa, 0);
1274         }
1275
1276         cpu_clear(cpu, smp_commenced_mask);
1277         membar_safe("#Sync");
1278
1279         local_irq_disable();
1280
1281         __asm__ __volatile__(
1282                 "rdpr   %%pstate, %0\n\t"
1283                 "wrpr   %0, %1, %%pstate"
1284                 : "=r" (pstate)
1285                 : "i" (PSTATE_IE));
1286
1287         while (1)
1288                 barrier();
1289 }
1290
1291 int __cpu_disable(void)
1292 {
1293         int cpu = smp_processor_id();
1294         cpuinfo_sparc *c;
1295         int i;
1296
1297         for_each_cpu_mask(i, cpu_core_map[cpu])
1298                 cpu_clear(cpu, cpu_core_map[i]);
1299         cpus_clear(cpu_core_map[cpu]);
1300
1301         for_each_cpu_mask(i, per_cpu(cpu_sibling_map, cpu))
1302                 cpu_clear(cpu, per_cpu(cpu_sibling_map, i));
1303         cpus_clear(per_cpu(cpu_sibling_map, cpu));
1304
1305         c = &cpu_data(cpu);
1306
1307         c->core_id = 0;
1308         c->proc_id = -1;
1309
1310         smp_wmb();
1311
1312         /* Make sure no interrupts point to this cpu.  */
1313         fixup_irqs();
1314
1315         local_irq_enable();
1316         mdelay(1);
1317         local_irq_disable();
1318
1319         ipi_call_lock();
1320         cpu_clear(cpu, cpu_online_map);
1321         ipi_call_unlock();
1322
1323         return 0;
1324 }
1325
1326 void __cpu_die(unsigned int cpu)
1327 {
1328         int i;
1329
1330         for (i = 0; i < 100; i++) {
1331                 smp_rmb();
1332                 if (!cpu_isset(cpu, smp_commenced_mask))
1333                         break;
1334                 msleep(100);
1335         }
1336         if (cpu_isset(cpu, smp_commenced_mask)) {
1337                 printk(KERN_ERR "CPU %u didn't die...\n", cpu);
1338         } else {
1339 #if defined(CONFIG_SUN_LDOMS)
1340                 unsigned long hv_err;
1341                 int limit = 100;
1342
1343                 do {
1344                         hv_err = sun4v_cpu_stop(cpu);
1345                         if (hv_err == HV_EOK) {
1346                                 cpu_clear(cpu, cpu_present_map);
1347                                 break;
1348                         }
1349                 } while (--limit > 0);
1350                 if (limit <= 0) {
1351                         printk(KERN_ERR "sun4v_cpu_stop() fails err=%lu\n",
1352                                hv_err);
1353                 }
1354 #endif
1355         }
1356 }
1357 #endif
1358
1359 void __init smp_cpus_done(unsigned int max_cpus)
1360 {
1361 }
1362
1363 void smp_send_reschedule(int cpu)
1364 {
1365         xcall_deliver((u64) &xcall_receive_signal, 0, 0,
1366                       &cpumask_of_cpu(cpu));
1367 }
1368
1369 void smp_receive_signal_client(int irq, struct pt_regs *regs)
1370 {
1371         clear_softint(1 << irq);
1372 }
1373
1374 /* This is a nop because we capture all other cpus
1375  * anyways when making the PROM active.
1376  */
1377 void smp_send_stop(void)
1378 {
1379 }
1380
1381 unsigned long __per_cpu_base __read_mostly;
1382 unsigned long __per_cpu_shift __read_mostly;
1383
1384 EXPORT_SYMBOL(__per_cpu_base);
1385 EXPORT_SYMBOL(__per_cpu_shift);
1386
1387 void __init real_setup_per_cpu_areas(void)
1388 {
1389         unsigned long paddr, goal, size, i;
1390         char *ptr;
1391
1392         /* Copy section for each CPU (we discard the original) */
1393         goal = PERCPU_ENOUGH_ROOM;
1394
1395         __per_cpu_shift = PAGE_SHIFT;
1396         for (size = PAGE_SIZE; size < goal; size <<= 1UL)
1397                 __per_cpu_shift++;
1398
1399         paddr = lmb_alloc(size * NR_CPUS, PAGE_SIZE);
1400         if (!paddr) {
1401                 prom_printf("Cannot allocate per-cpu memory.\n");
1402                 prom_halt();
1403         }
1404
1405         ptr = __va(paddr);
1406         __per_cpu_base = ptr - __per_cpu_start;
1407
1408         for (i = 0; i < NR_CPUS; i++, ptr += size)
1409                 memcpy(ptr, __per_cpu_start, __per_cpu_end - __per_cpu_start);
1410
1411         /* Setup %g5 for the boot cpu.  */
1412         __local_per_cpu_offset = __per_cpu_offset(smp_processor_id());
1413 }