arch/sparc64/kernel/smp.c

   1 /* smp.c: Sparc64 SMP support.
   2  *
   3  * Copyright (C) 1997, 2007 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/bootmem.h>
  24
  25 #include <asm/head.h>
  26 #include <asm/ptrace.h>
  27 #include <asm/atomic.h>
  28 #include <asm/tlbflush.h>
  29 #include <asm/mmu_context.h>
  30 #include <asm/cpudata.h>
  31 #include <asm/hvtramp.h>
  32 #include <asm/io.h>
  33
  34 #include <asm/irq.h>
  35 #include <asm/irq_regs.h>
  36 #include <asm/page.h>
  37 #include <asm/pgtable.h>
  38 #include <asm/oplib.h>
  39 #include <asm/uaccess.h>
  40 #include <asm/timer.h>
  41 #include <asm/starfire.h>
  42 #include <asm/tlb.h>
  43 #include <asm/sections.h>
  44 #include <asm/prom.h>
  45 #include <asm/mdesc.h>
  46 #include <asm/ldc.h>
  47 #include <asm/hypervisor.h>
  48
  49 int sparc64_multi_core __read_mostly;
  50
  51 cpumask_t cpu_possible_map __read_mostly = CPU_MASK_NONE;
  52 cpumask_t cpu_online_map __read_mostly = CPU_MASK_NONE;
  53 DEFINE_PER_CPU(cpumask_t, cpu_sibling_map) = CPU_MASK_NONE;
  54 cpumask_t cpu_core_map[NR_CPUS] __read_mostly =
  55         { [0 ... NR_CPUS-1] = CPU_MASK_NONE };
  56
  57 EXPORT_SYMBOL(cpu_possible_map);
  58 EXPORT_SYMBOL(cpu_online_map);
  59 EXPORT_PER_CPU_SYMBOL(cpu_sibling_map);
  60 EXPORT_SYMBOL(cpu_core_map);
  61
  62 static cpumask_t smp_commenced_mask;
  63
  64 void smp_info(struct seq_file *m)
  65 {
  66         int i;
  67
  68         seq_printf(m, "State:\n");
  69         for_each_online_cpu(i)
  70                 seq_printf(m, "CPU%d:\t\tonline\n", i);
  71 }
  72
  73 void smp_bogo(struct seq_file *m)
  74 {
  75         int i;
  76
  77         for_each_online_cpu(i)
  78                 seq_printf(m,
  79                            "Cpu%dClkTck\t: %016lx\n",
  80                            i, cpu_data(i).clock_tick);
  81 }
  82
  83 static __cacheline_aligned_in_smp DEFINE_SPINLOCK(call_lock);
  84
  85 extern void setup_sparc64_timer(void);
  86
  87 static volatile unsigned long callin_flag = 0;
  88
  89 void __cpuinit smp_callin(void)
  90 {
  91         int cpuid = hard_smp_processor_id();
  92
  93         __local_per_cpu_offset = __per_cpu_offset(cpuid);
  94
  95         if (tlb_type == hypervisor)
  96                 sun4v_ktsb_register();
  97
  98         __flush_tlb_all();
  99
 100         setup_sparc64_timer();
 101
 102         if (cheetah_pcache_forced_on)
 103                 cheetah_enable_pcache();
 104
 105         local_irq_enable();
 106
 107         callin_flag = 1;
 108         __asm__ __volatile__("membar #Sync\n\t"
 109                              "flush  %%g6" : : : "memory");
 110
 111         /* Clear this or we will die instantly when we
 112          * schedule back to this idler...
 113          */
 114         current_thread_info()->new_child = 0;
 115
 116         /* Attach to the address space of init_task. */
 117         atomic_inc(&init_mm.mm_count);
 118         current->active_mm = &init_mm;
 119
 120         while (!cpu_isset(cpuid, smp_commenced_mask))
 121                 rmb();
 122
 123         spin_lock(&call_lock);
 124         cpu_set(cpuid, cpu_online_map);
 125         spin_unlock(&call_lock);
 126
 127         /* idle thread is expected to have preempt disabled */
 128         preempt_disable();
 129 }
 130
 131 void cpu_panic(void)
 132 {
 133         printk("CPU[%d]: Returns from cpu_idle!\n", smp_processor_id());
 134         panic("SMP bolixed\n");
 135 }
 136
 137 /* This tick register synchronization scheme is taken entirely from
 138  * the ia64 port, see arch/ia64/kernel/smpboot.c for details and credit.
 139  *
 140  * The only change I've made is to rework it so that the master
 141  * initiates the synchonization instead of the slave. -DaveM
 142  */
 143
 144 #define MASTER  0
 145 #define SLAVE   (SMP_CACHE_BYTES/sizeof(unsigned long))
 146
 147 #define NUM_ROUNDS      64      /* magic value */
 148 #define NUM_ITERS       5       /* likewise */
 149
 150 static DEFINE_SPINLOCK(itc_sync_lock);
 151 static unsigned long go[SLAVE + 1];
 152
 153 #define DEBUG_TICK_SYNC 0
 154
 155 static inline long get_delta (long *rt, long *master)
 156 {
 157         unsigned long best_t0 = 0, best_t1 = ~0UL, best_tm = 0;
 158         unsigned long tcenter, t0, t1, tm;
 159         unsigned long i;
 160
 161         for (i = 0; i < NUM_ITERS; i++) {
 162                 t0 = tick_ops->get_tick();
 163                 go[MASTER] = 1;
 164                 membar_storeload();
 165                 while (!(tm = go[SLAVE]))
 166                         rmb();
 167                 go[SLAVE] = 0;
 168                 wmb();
 169                 t1 = tick_ops->get_tick();
 170
 171                 if (t1 - t0 < best_t1 - best_t0)
 172                         best_t0 = t0, best_t1 = t1, best_tm = tm;
 173         }
 174
 175         *rt = best_t1 - best_t0;
 176         *master = best_tm - best_t0;
 177
 178         /* average best_t0 and best_t1 without overflow: */
 179         tcenter = (best_t0/2 + best_t1/2);
 180         if (best_t0 % 2 + best_t1 % 2 == 2)
 181                 tcenter++;
 182         return tcenter - best_tm;
 183 }
 184
 185 void smp_synchronize_tick_client(void)
 186 {
 187         long i, delta, adj, adjust_latency = 0, done = 0;
 188         unsigned long flags, rt, master_time_stamp, bound;
 189 #if DEBUG_TICK_SYNC
 190         struct {
 191                 long rt;        /* roundtrip time */
 192                 long master;    /* master's timestamp */
 193                 long diff;      /* difference between midpoint and master's timestamp */
 194                 long lat;       /* estimate of itc adjustment latency */
 195         } t[NUM_ROUNDS];
 196 #endif
 197
 198         go[MASTER] = 1;
 199
 200         while (go[MASTER])
 201                 rmb();
 202
 203         local_irq_save(flags);
 204         {
 205                 for (i = 0; i < NUM_ROUNDS; i++) {
 206                         delta = get_delta(&rt, &master_time_stamp);
 207                         if (delta == 0) {
 208                                 done = 1;       /* let's lock on to this... */
 209                                 bound = rt;
 210                         }
 211
 212                         if (!done) {
 213                                 if (i > 0) {
 214                                         adjust_latency += -delta;
 215                                         adj = -delta + adjust_latency/4;
 216                                 } else
 217                                         adj = -delta;
 218
 219                                 tick_ops->add_tick(adj);
 220                         }
 221 #if DEBUG_TICK_SYNC
 222                         t[i].rt = rt;
 223                         t[i].master = master_time_stamp;
 224                         t[i].diff = delta;
 225                         t[i].lat = adjust_latency/4;
 226 #endif
 227                 }
 228         }
 229         local_irq_restore(flags);
 230
 231 #if DEBUG_TICK_SYNC
 232         for (i = 0; i < NUM_ROUNDS; i++)
 233                 printk("rt=%5ld master=%5ld diff=%5ld adjlat=%5ld\n",
 234                        t[i].rt, t[i].master, t[i].diff, t[i].lat);
 235 #endif
 236
 237         printk(KERN_INFO "CPU %d: synchronized TICK with master CPU "
 238                "(last diff %ld cycles, maxerr %lu cycles)\n",
 239                smp_processor_id(), delta, rt);
 240 }
 241
 242 static void smp_start_sync_tick_client(int cpu);
 243
 244 static void smp_synchronize_one_tick(int cpu)
 245 {
 246         unsigned long flags, i;
 247
 248         go[MASTER] = 0;
 249
 250         smp_start_sync_tick_client(cpu);
 251
 252         /* wait for client to be ready */
 253         while (!go[MASTER])
 254                 rmb();
 255
 256         /* now let the client proceed into his loop */
 257         go[MASTER] = 0;
 258         membar_storeload();
 259
 260         spin_lock_irqsave(&itc_sync_lock, flags);
 261         {
 262                 for (i = 0; i < NUM_ROUNDS*NUM_ITERS; i++) {
 263                         while (!go[MASTER])
 264                                 rmb();
 265                         go[MASTER] = 0;
 266                         wmb();
 267                         go[SLAVE] = tick_ops->get_tick();
 268                         membar_storeload();
 269                 }
 270         }
 271         spin_unlock_irqrestore(&itc_sync_lock, flags);
 272 }
 273
 274 #if defined(CONFIG_SUN_LDOMS) && defined(CONFIG_HOTPLUG_CPU)
 275 /* XXX Put this in some common place. XXX */
 276 static unsigned long kimage_addr_to_ra(void *p)
 277 {
 278         unsigned long val = (unsigned long) p;
 279
 280         return kern_base + (val - KERNBASE);
 281 }
 282
 283 static void ldom_startcpu_cpuid(unsigned int cpu, unsigned long thread_reg)
 284 {
 285         extern unsigned long sparc64_ttable_tl0;
 286         extern unsigned long kern_locked_tte_data;
 287         extern int bigkernel;
 288         struct hvtramp_descr *hdesc;
 289         unsigned long trampoline_ra;
 290         struct trap_per_cpu *tb;
 291         u64 tte_vaddr, tte_data;
 292         unsigned long hv_err;
 293
 294         hdesc = kzalloc(sizeof(*hdesc), GFP_KERNEL);
 295         if (!hdesc) {
 296                 printk(KERN_ERR "ldom_startcpu_cpuid: Cannot allocate "
 297                        "hvtramp_descr.\n");
 298                 return;
 299         }
 300
 301         hdesc->cpu = cpu;
 302         hdesc->num_mappings = (bigkernel ? 2 : 1);
 303
 304         tb = &trap_block[cpu];
 305         tb->hdesc = hdesc;
 306
 307         hdesc->fault_info_va = (unsigned long) &tb->fault_info;
 308         hdesc->fault_info_pa = kimage_addr_to_ra(&tb->fault_info);
 309
 310         hdesc->thread_reg = thread_reg;
 311
 312         tte_vaddr = (unsigned long) KERNBASE;
 313         tte_data = kern_locked_tte_data;
 314
 315         hdesc->maps[0].vaddr = tte_vaddr;
 316         hdesc->maps[0].tte   = tte_data;
 317         if (bigkernel) {
 318                 tte_vaddr += 0x400000;
 319                 tte_data  += 0x400000;
 320                 hdesc->maps[1].vaddr = tte_vaddr;
 321                 hdesc->maps[1].tte   = tte_data;
 322         }
 323
 324         trampoline_ra = kimage_addr_to_ra(hv_cpu_startup);
 325
 326         hv_err = sun4v_cpu_start(cpu, trampoline_ra,
 327                                  kimage_addr_to_ra(&sparc64_ttable_tl0),
 328                                  __pa(hdesc));
 329         if (hv_err)
 330                 printk(KERN_ERR "ldom_startcpu_cpuid: sun4v_cpu_start() "
 331                        "gives error %lu\n", hv_err);
 332 }
 333 #endif
 334
 335 extern unsigned long sparc64_cpu_startup;
 336
 337 /* The OBP cpu startup callback truncates the 3rd arg cookie to
 338  * 32-bits (I think) so to be safe we have it read the pointer
 339  * contained here so we work on >4GB machines. -DaveM
 340  */
 341 static struct thread_info *cpu_new_thread = NULL;
 342
 343 static int __devinit smp_boot_one_cpu(unsigned int cpu)
 344 {
 345         struct trap_per_cpu *tb = &trap_block[cpu];
 346         unsigned long entry =
 347                 (unsigned long)(&sparc64_cpu_startup);
 348         unsigned long cookie =
 349                 (unsigned long)(&cpu_new_thread);
 350         struct task_struct *p;
 351         int timeout, ret;
 352
 353         p = fork_idle(cpu);
 354         if (IS_ERR(p))
 355                 return PTR_ERR(p);
 356         callin_flag = 0;
 357         cpu_new_thread = task_thread_info(p);
 358
 359         if (tlb_type == hypervisor) {
 360 #if defined(CONFIG_SUN_LDOMS) && defined(CONFIG_HOTPLUG_CPU)
 361                 if (ldom_domaining_enabled)
 362                         ldom_startcpu_cpuid(cpu,
 363                                             (unsigned long) cpu_new_thread);
 364                 else
 365 #endif
 366                         prom_startcpu_cpuid(cpu, entry, cookie);
 367         } else {
 368                 struct device_node *dp = of_find_node_by_cpuid(cpu);
 369
 370                 prom_startcpu(dp->node, entry, cookie);
 371         }
 372
 373         for (timeout = 0; timeout < 50000; timeout++) {
 374                 if (callin_flag)
 375                         break;
 376                 udelay(100);
 377         }
 378
 379         if (callin_flag) {
 380                 ret = 0;
 381         } else {
 382                 printk("Processor %d is stuck.\n", cpu);
 383                 ret = -ENODEV;
 384         }
 385         cpu_new_thread = NULL;
 386
 387         if (tb->hdesc) {
 388                 kfree(tb->hdesc);
 389                 tb->hdesc = NULL;
 390         }
 391
 392         return ret;
 393 }
 394
 395 static void spitfire_xcall_helper(u64 data0, u64 data1, u64 data2, u64 pstate, unsigned long cpu)
 396 {
 397         u64 result, target;
 398         int stuck, tmp;
 399
 400         if (this_is_starfire) {
 401                 /* map to real upaid */
 402                 cpu = (((cpu & 0x3c) << 1) |
 403                         ((cpu & 0x40) >> 4) |
 404                         (cpu & 0x3));
 405         }
 406
 407         target = (cpu << 14) | 0x70;
 408 again:
 409         /* Ok, this is the real Spitfire Errata #54.
 410          * One must read back from a UDB internal register
 411          * after writes to the UDB interrupt dispatch, but
 412          * before the membar Sync for that write.
 413          * So we use the high UDB control register (ASI 0x7f,
 414          * ADDR 0x20) for the dummy read. -DaveM
 415          */
 416         tmp = 0x40;
 417         __asm__ __volatile__(
 418         "wrpr   %1, %2, %%pstate\n\t"
 419         "stxa   %4, [%0] %3\n\t"
 420         "stxa   %5, [%0+%8] %3\n\t"
 421         "add    %0, %8, %0\n\t"
 422         "stxa   %6, [%0+%8] %3\n\t"
 423         "membar #Sync\n\t"
 424         "stxa   %%g0, [%7] %3\n\t"
 425         "membar #Sync\n\t"
 426         "mov    0x20, %%g1\n\t"
 427         "ldxa   [%%g1] 0x7f, %%g0\n\t"
 428         "membar #Sync"
 429         : "=r" (tmp)
 430         : "r" (pstate), "i" (PSTATE_IE), "i" (ASI_INTR_W),
 431           "r" (data0), "r" (data1), "r" (data2), "r" (target),
 432           "r" (0x10), "0" (tmp)
 433         : "g1");
 434
 435         /* NOTE: PSTATE_IE is still clear. */
 436         stuck = 100000;
 437         do {
 438                 __asm__ __volatile__("ldxa [%%g0] %1, %0"
 439                         : "=r" (result)
 440                         : "i" (ASI_INTR_DISPATCH_STAT));
 441                 if (result == 0) {
 442                         __asm__ __volatile__("wrpr %0, 0x0, %%pstate"
 443                                              : : "r" (pstate));
 444                         return;
 445                 }
 446                 stuck -= 1;
 447                 if (stuck == 0)
 448                         break;
 449         } while (result & 0x1);
 450         __asm__ __volatile__("wrpr %0, 0x0, %%pstate"
 451                              : : "r" (pstate));
 452         if (stuck == 0) {
 453                 printk("CPU[%d]: mondo stuckage result[%016lx]\n",
 454                        smp_processor_id(), result);
 455         } else {
 456                 udelay(2);
 457                 goto again;
 458         }
 459 }
 460
 461 static inline void spitfire_xcall_deliver(u64 data0, u64 data1, u64 data2, cpumask_t mask)
 462 {
 463         u64 pstate;
 464         int i;
 465
 466         __asm__ __volatile__("rdpr %%pstate, %0" : "=r" (pstate));
 467         for_each_cpu_mask(i, mask)
 468                 spitfire_xcall_helper(data0, data1, data2, pstate, i);
 469 }
 470
 471 /* Cheetah now allows to send the whole 64-bytes of data in the interrupt
 472  * packet, but we have no use for that.  However we do take advantage of
 473  * the new pipelining feature (ie. dispatch to multiple cpus simultaneously).
 474  */
 475 static void cheetah_xcall_deliver(u64 data0, u64 data1, u64 data2, cpumask_t mask)
 476 {
 477         u64 pstate, ver, busy_mask;
 478         int nack_busy_id, is_jbus, need_more;
 479
 480         if (cpus_empty(mask))
 481                 return;
 482
 483         /* Unfortunately, someone at Sun had the brilliant idea to make the
 484          * busy/nack fields hard-coded by ITID number for this Ultra-III
 485          * derivative processor.
 486          */
 487         __asm__ ("rdpr %%ver, %0" : "=r" (ver));
 488         is_jbus = ((ver >> 32) == __JALAPENO_ID ||
 489                    (ver >> 32) == __SERRANO_ID);
 490
 491         __asm__ __volatile__("rdpr %%pstate, %0" : "=r" (pstate));
 492
 493 retry:
 494         need_more = 0;
 495         __asm__ __volatile__("wrpr %0, %1, %%pstate\n\t"
 496                              : : "r" (pstate), "i" (PSTATE_IE));
 497
 498         /* Setup the dispatch data registers. */
 499         __asm__ __volatile__("stxa      %0, [%3] %6\n\t"
 500                              "stxa      %1, [%4] %6\n\t"
 501                              "stxa      %2, [%5] %6\n\t"
 502                              "membar    #Sync\n\t"
 503                              : /* no outputs */
 504                              : "r" (data0), "r" (data1), "r" (data2),
 505                                "r" (0x40), "r" (0x50), "r" (0x60),
 506                                "i" (ASI_INTR_W));
 507
 508         nack_busy_id = 0;
 509         busy_mask = 0;
 510         {
 511                 int i;
 512
 513                 for_each_cpu_mask(i, mask) {
 514                         u64 target = (i << 14) | 0x70;
 515
 516                         if (is_jbus) {
 517                                 busy_mask |= (0x1UL << (i * 2));
 518                         } else {
 519                                 target |= (nack_busy_id << 24);
 520                                 busy_mask |= (0x1UL <<
 521                                               (nack_busy_id * 2));
 522                         }
 523                         __asm__ __volatile__(
 524                                 "stxa   %%g0, [%0] %1\n\t"
 525                                 "membar #Sync\n\t"
 526                                 : /* no outputs */
 527                                 : "r" (target), "i" (ASI_INTR_W));
 528                         nack_busy_id++;
 529                         if (nack_busy_id == 32) {
 530                                 need_more = 1;
 531                                 break;
 532                         }
 533                 }
 534         }
 535
 536         /* Now, poll for completion. */
 537         {
 538                 u64 dispatch_stat, nack_mask;
 539                 long stuck;
 540
 541                 stuck = 100000 * nack_busy_id;
 542                 nack_mask = busy_mask << 1;
 543                 do {
 544                         __asm__ __volatile__("ldxa      [%%g0] %1, %0"
 545                                              : "=r" (dispatch_stat)
 546                                              : "i" (ASI_INTR_DISPATCH_STAT));
 547                         if (!(dispatch_stat & (busy_mask | nack_mask))) {
 548                                 __asm__ __volatile__("wrpr %0, 0x0, %%pstate"
 549                                                      : : "r" (pstate));
 550                                 if (unlikely(need_more)) {
 551                                         int i, cnt = 0;
 552                                         for_each_cpu_mask(i, mask) {
 553                                                 cpu_clear(i, mask);
 554                                                 cnt++;
 555                                                 if (cnt == 32)
 556                                                         break;
 557                                         }
 558                                         goto retry;
 559                                 }
 560                                 return;
 561                         }
 562                         if (!--stuck)
 563                                 break;
 564                 } while (dispatch_stat & busy_mask);
 565
 566                 __asm__ __volatile__("wrpr %0, 0x0, %%pstate"
 567                                      : : "r" (pstate));
 568
 569                 if (dispatch_stat & busy_mask) {
 570                         /* Busy bits will not clear, continue instead
 571                          * of freezing up on this cpu.
 572                          */
 573                         printk("CPU[%d]: mondo stuckage result[%016lx]\n",
 574                                smp_processor_id(), dispatch_stat);
 575                 } else {
 576                         int i, this_busy_nack = 0;
 577
 578                         /* Delay some random time with interrupts enabled
 579                          * to prevent deadlock.
 580                          */
 581                         udelay(2 * nack_busy_id);
 582
 583                         /* Clear out the mask bits for cpus which did not
 584                          * NACK us.
 585                          */
 586                         for_each_cpu_mask(i, mask) {
 587                                 u64 check_mask;
 588
 589                                 if (is_jbus)
 590                                         check_mask = (0x2UL << (2*i));
 591                                 else
 592                                         check_mask = (0x2UL <<
 593                                                       this_busy_nack);
 594                                 if ((dispatch_stat & check_mask) == 0)
 595                                         cpu_clear(i, mask);
 596                                 this_busy_nack += 2;
 597                                 if (this_busy_nack == 64)
 598                                         break;
 599                         }
 600
 601                         goto retry;
 602                 }
 603         }
 604 }
 605
 606 /* Multi-cpu list version.  */
 607 static void hypervisor_xcall_deliver(u64 data0, u64 data1, u64 data2, cpumask_t mask)
 608 {
 609         struct trap_per_cpu *tb;
 610         u16 *cpu_list;
 611         u64 *mondo;
 612         cpumask_t error_mask;
 613         unsigned long flags, status;
 614         int cnt, retries, this_cpu, prev_sent, i;
 615
 616         if (cpus_empty(mask))
 617                 return;
 618
 619         /* We have to do this whole thing with interrupts fully disabled.
 620          * Otherwise if we send an xcall from interrupt context it will
 621          * corrupt both our mondo block and cpu list state.
 622          *
 623          * One consequence of this is that we cannot use timeout mechanisms
 624          * that depend upon interrupts being delivered locally.  So, for
 625          * example, we cannot sample jiffies and expect it to advance.
 626          *
 627          * Fortunately, udelay() uses %stick/%tick so we can use that.
 628          */
 629         local_irq_save(flags);
 630
 631         this_cpu = smp_processor_id();
 632         tb = &trap_block[this_cpu];
 633
 634         mondo = __va(tb->cpu_mondo_block_pa);
 635         mondo[0] = data0;
 636         mondo[1] = data1;
 637         mondo[2] = data2;
 638         wmb();
 639
 640         cpu_list = __va(tb->cpu_list_pa);
 641
 642         /* Setup the initial cpu list.  */
 643         cnt = 0;
 644         for_each_cpu_mask(i, mask)
 645                 cpu_list[cnt++] = i;
 646
 647         cpus_clear(error_mask);
 648         retries = 0;
 649         prev_sent = 0;
 650         do {
 651                 int forward_progress, n_sent;
 652
 653                 status = sun4v_cpu_mondo_send(cnt,
 654                                               tb->cpu_list_pa,
 655                                               tb->cpu_mondo_block_pa);
 656
 657                 /* HV_EOK means all cpus received the xcall, we're done.  */
 658                 if (likely(status == HV_EOK))
 659                         break;
 660
 661                 /* First, see if we made any forward progress.
 662                  *
 663                  * The hypervisor indicates successful sends by setting
 664                  * cpu list entries to the value 0xffff.
 665                  */
 666                 n_sent = 0;
 667                 for (i = 0; i < cnt; i++) {
 668                         if (likely(cpu_list[i] == 0xffff))
 669                                 n_sent++;
 670                 }
 671
 672                 forward_progress = 0;
 673                 if (n_sent > prev_sent)
 674                         forward_progress = 1;
 675
 676                 prev_sent = n_sent;
 677
 678                 /* If we get a HV_ECPUERROR, then one or more of the cpus
 679                  * in the list are in error state.  Use the cpu_state()
 680                  * hypervisor call to find out which cpus are in error state.
 681                  */
 682                 if (unlikely(status == HV_ECPUERROR)) {
 683                         for (i = 0; i < cnt; i++) {
 684                                 long err;
 685                                 u16 cpu;
 686
 687                                 cpu = cpu_list[i];
 688                                 if (cpu == 0xffff)
 689                                         continue;
 690
 691                                 err = sun4v_cpu_state(cpu);
 692                                 if (err >= 0 &&
 693                                     err == HV_CPU_STATE_ERROR) {
 694                                         cpu_list[i] = 0xffff;
 695                                         cpu_set(cpu, error_mask);
 696                                 }
 697                         }
 698                 } else if (unlikely(status != HV_EWOULDBLOCK))
 699                         goto fatal_mondo_error;
 700
 701                 /* Don't bother rewriting the CPU list, just leave the
 702                  * 0xffff and non-0xffff entries in there and the
 703                  * hypervisor will do the right thing.
 704                  *
 705                  * Only advance timeout state if we didn't make any
 706                  * forward progress.
 707                  */
 708                 if (unlikely(!forward_progress)) {
 709                         if (unlikely(++retries > 10000))
 710                                 goto fatal_mondo_timeout;
 711
 712                         /* Delay a little bit to let other cpus catch up
 713                          * on their cpu mondo queue work.
 714                          */
 715                         udelay(2 * cnt);
 716                 }
 717         } while (1);
 718
 719         local_irq_restore(flags);
 720
 721         if (unlikely(!cpus_empty(error_mask)))
 722                 goto fatal_mondo_cpu_error;
 723
 724         return;
 725
 726 fatal_mondo_cpu_error:
 727         printk(KERN_CRIT "CPU[%d]: SUN4V mondo cpu error, some target cpus "
 728                "were in error state\n",
 729                this_cpu);
 730         printk(KERN_CRIT "CPU[%d]: Error mask [ ", this_cpu);
 731         for_each_cpu_mask(i, error_mask)
 732                 printk("%d ", i);
 733         printk("]\n");
 734         return;
 735
 736 fatal_mondo_timeout:
 737         local_irq_restore(flags);
 738         printk(KERN_CRIT "CPU[%d]: SUN4V mondo timeout, no forward "
 739                " progress after %d retries.\n",
 740                this_cpu, retries);
 741         goto dump_cpu_list_and_out;
 742
 743 fatal_mondo_error:
 744         local_irq_restore(flags);
 745         printk(KERN_CRIT "CPU[%d]: Unexpected SUN4V mondo error %lu\n",
 746                this_cpu, status);
 747         printk(KERN_CRIT "CPU[%d]: Args were cnt(%d) cpulist_pa(%lx) "
 748                "mondo_block_pa(%lx)\n",
 749                this_cpu, cnt, tb->cpu_list_pa, tb->cpu_mondo_block_pa);
 750
 751 dump_cpu_list_and_out:
 752         printk(KERN_CRIT "CPU[%d]: CPU list [ ", this_cpu);
 753         for (i = 0; i < cnt; i++)
 754                 printk("%u ", cpu_list[i]);
 755         printk("]\n");
 756 }
 757
 758 /* Send cross call to all processors mentioned in MASK
 759  * except self.
 760  */
 761 static void smp_cross_call_masked(unsigned long *func, u32 ctx, u64 data1, u64 data2, cpumask_t mask)
 762 {
 763         u64 data0 = (((u64)ctx)<<32 | (((u64)func) & 0xffffffff));
 764         int this_cpu = get_cpu();
 765
 766         cpus_and(mask, mask, cpu_online_map);
 767         cpu_clear(this_cpu, mask);
 768
 769         if (tlb_type == spitfire)
 770                 spitfire_xcall_deliver(data0, data1, data2, mask);
 771         else if (tlb_type == cheetah || tlb_type == cheetah_plus)
 772                 cheetah_xcall_deliver(data0, data1, data2, mask);
 773         else
 774                 hypervisor_xcall_deliver(data0, data1, data2, mask);
 775         /* NOTE: Caller runs local copy on master. */
 776
 777         put_cpu();
 778 }
 779
 780 extern unsigned long xcall_sync_tick;
 781
 782 static void smp_start_sync_tick_client(int cpu)
 783 {
 784         cpumask_t mask = cpumask_of_cpu(cpu);
 785
 786         smp_cross_call_masked(&xcall_sync_tick,
 787                               0, 0, 0, mask);
 788 }
 789
 790 /* Send cross call to all processors except self. */
 791 #define smp_cross_call(func, ctx, data1, data2) \
 792         smp_cross_call_masked(func, ctx, data1, data2, cpu_online_map)
 793
 794 struct call_data_struct {
 795         void (*func) (void *info);
 796         void *info;
 797         atomic_t finished;
 798         int wait;
 799 };
 800
 801 static struct call_data_struct *call_data;
 802
 803 extern unsigned long xcall_call_function;
 804
 805 /**
 806  * smp_call_function(): Run a function on all other CPUs.
 807  * @func: The function to run. This must be fast and non-blocking.
 808  * @info: An arbitrary pointer to pass to the function.
 809  * @nonatomic: currently unused.
 810  * @wait: If true, wait (atomically) until function has completed on other CPUs.
 811  *
 812  * Returns 0 on success, else a negative status code. Does not return until
 813  * remote CPUs are nearly ready to execute <<func>> or are or have executed.
 814  *
 815  * You must not call this function with disabled interrupts or from a
 816  * hardware interrupt handler or from a bottom half handler.
 817  */
 818 static int smp_call_function_mask(void (*func)(void *info), void *info,
 819                                   int nonatomic, int wait, cpumask_t mask)
 820 {
 821         struct call_data_struct data;
 822         int cpus;
 823
 824         /* Can deadlock when called with interrupts disabled */
 825         WARN_ON(irqs_disabled());
 826
 827         data.func = func;
 828         data.info = info;
 829         atomic_set(&data.finished, 0);
 830         data.wait = wait;
 831
 832         spin_lock(&call_lock);
 833
 834         cpu_clear(smp_processor_id(), mask);
 835         cpus = cpus_weight(mask);
 836         if (!cpus)
 837                 goto out_unlock;
 838
 839         call_data = &data;
 840         mb();
 841
 842         smp_cross_call_masked(&xcall_call_function, 0, 0, 0, mask);
 843
 844         /* Wait for response */
 845         while (atomic_read(&data.finished) != cpus)
 846                 cpu_relax();
 847
 848 out_unlock:
 849         spin_unlock(&call_lock);
 850
 851         return 0;
 852 }
 853
 854 int smp_call_function(void (*func)(void *info), void *info,
 855                       int nonatomic, int wait)
 856 {
 857         return smp_call_function_mask(func, info, nonatomic, wait,
 858                                       cpu_online_map);
 859 }
 860
 861 void smp_call_function_client(int irq, struct pt_regs *regs)
 862 {
 863         void (*func) (void *info) = call_data->func;
 864         void *info = call_data->info;
 865
 866         clear_softint(1 << irq);
 867         if (call_data->wait) {
 868                 /* let initiator proceed only after completion */
 869                 func(info);
 870                 atomic_inc(&call_data->finished);
 871         } else {
 872                 /* let initiator proceed after getting data */
 873                 atomic_inc(&call_data->finished);
 874                 func(info);
 875         }
 876 }
 877
 878 static void tsb_sync(void *info)
 879 {
 880         struct trap_per_cpu *tp = &trap_block[raw_smp_processor_id()];
 881         struct mm_struct *mm = info;
 882
 883         /* It is not valid to test "currrent->active_mm == mm" here.
 884          *
 885          * The value of "current" is not changed atomically with
 886          * switch_mm().  But that's OK, we just need to check the
 887          * current cpu's trap block PGD physical address.
 888          */
 889         if (tp->pgd_paddr == __pa(mm->pgd))
 890                 tsb_context_switch(mm);
 891 }
 892
 893 void smp_tsb_sync(struct mm_struct *mm)
 894 {
 895         smp_call_function_mask(tsb_sync, mm, 0, 1, mm->cpu_vm_mask);
 896 }
 897
 898 extern unsigned long xcall_flush_tlb_mm;
 899 extern unsigned long xcall_flush_tlb_pending;
 900 extern unsigned long xcall_flush_tlb_kernel_range;
 901 extern unsigned long xcall_report_regs;
 902 extern unsigned long xcall_receive_signal;
 903 extern unsigned long xcall_new_mmu_context_version;
 904
 905 #ifdef DCACHE_ALIASING_POSSIBLE
 906 extern unsigned long xcall_flush_dcache_page_cheetah;
 907 #endif
 908 extern unsigned long xcall_flush_dcache_page_spitfire;
 909
 910 #ifdef CONFIG_DEBUG_DCFLUSH
 911 extern atomic_t dcpage_flushes;
 912 extern atomic_t dcpage_flushes_xcall;
 913 #endif
 914
 915 static inline void __local_flush_dcache_page(struct page *page)
 916 {
 917 #ifdef DCACHE_ALIASING_POSSIBLE
 918         __flush_dcache_page(page_address(page),
 919                             ((tlb_type == spitfire) &&
 920                              page_mapping(page) != NULL));
 921 #else
 922         if (page_mapping(page) != NULL &&
 923             tlb_type == spitfire)
 924                 __flush_icache_page(__pa(page_address(page)));
 925 #endif
 926 }
 927
 928 void smp_flush_dcache_page_impl(struct page *page, int cpu)
 929 {
 930         cpumask_t mask = cpumask_of_cpu(cpu);
 931         int this_cpu;
 932
 933         if (tlb_type == hypervisor)
 934                 return;
 935
 936 #ifdef CONFIG_DEBUG_DCFLUSH
 937         atomic_inc(&dcpage_flushes);
 938 #endif
 939
 940         this_cpu = get_cpu();
 941
 942         if (cpu == this_cpu) {
 943                 __local_flush_dcache_page(page);
 944         } else if (cpu_online(cpu)) {
 945                 void *pg_addr = page_address(page);
 946                 u64 data0;
 947
 948                 if (tlb_type == spitfire) {
 949                         data0 =
 950                                 ((u64)&xcall_flush_dcache_page_spitfire);
 951                         if (page_mapping(page) != NULL)
 952                                 data0 |= ((u64)1 << 32);
 953                         spitfire_xcall_deliver(data0,
 954                                                __pa(pg_addr),
 955                                                (u64) pg_addr,
 956                                                mask);
 957                 } else if (tlb_type == cheetah || tlb_type == cheetah_plus) {
 958 #ifdef DCACHE_ALIASING_POSSIBLE
 959                         data0 =
 960                                 ((u64)&xcall_flush_dcache_page_cheetah);
 961                         cheetah_xcall_deliver(data0,
 962                                               __pa(pg_addr),
 963                                               0, mask);
 964 #endif
 965                 }
 966 #ifdef CONFIG_DEBUG_DCFLUSH
 967                 atomic_inc(&dcpage_flushes_xcall);
 968 #endif
 969         }
 970
 971         put_cpu();
 972 }
 973
 974 void flush_dcache_page_all(struct mm_struct *mm, struct page *page)
 975 {
 976         void *pg_addr = page_address(page);
 977         cpumask_t mask = cpu_online_map;
 978         u64 data0;
 979         int this_cpu;
 980
 981         if (tlb_type == hypervisor)
 982                 return;
 983
 984         this_cpu = get_cpu();
 985
 986         cpu_clear(this_cpu, mask);
 987
 988 #ifdef CONFIG_DEBUG_DCFLUSH
 989         atomic_inc(&dcpage_flushes);
 990 #endif
 991         if (cpus_empty(mask))
 992                 goto flush_self;
 993         if (tlb_type == spitfire) {
 994                 data0 = ((u64)&xcall_flush_dcache_page_spitfire);
 995                 if (page_mapping(page) != NULL)
 996                         data0 |= ((u64)1 << 32);
 997                 spitfire_xcall_deliver(data0,
 998                                        __pa(pg_addr),
 999                                        (u64) pg_addr,
1000                                        mask);
1001         } else if (tlb_type == cheetah || tlb_type == cheetah_plus) {
1002 #ifdef DCACHE_ALIASING_POSSIBLE
1003                 data0 = ((u64)&xcall_flush_dcache_page_cheetah);
1004                 cheetah_xcall_deliver(data0,
1005                                       __pa(pg_addr),
1006                                       0, mask);
1007 #endif
1008         }
1009 #ifdef CONFIG_DEBUG_DCFLUSH
1010         atomic_inc(&dcpage_flushes_xcall);
1011 #endif
1012  flush_self:
1013         __local_flush_dcache_page(page);
1014
1015         put_cpu();
1016 }
1017
1018 static void __smp_receive_signal_mask(cpumask_t mask)
1019 {
1020         smp_cross_call_masked(&xcall_receive_signal, 0, 0, 0, mask);
1021 }
1022
1023 void smp_receive_signal(int cpu)
1024 {
1025         cpumask_t mask = cpumask_of_cpu(cpu);
1026
1027         if (cpu_online(cpu))
1028                 __smp_receive_signal_mask(mask);
1029 }
1030
1031 void smp_receive_signal_client(int irq, struct pt_regs *regs)
1032 {
1033         clear_softint(1 << irq);
1034 }
1035
1036 void smp_new_mmu_context_version_client(int irq, struct pt_regs *regs)
1037 {
1038         struct mm_struct *mm;
1039         unsigned long flags;
1040
1041         clear_softint(1 << irq);
1042
1043         /* See if we need to allocate a new TLB context because
1044          * the version of the one we are using is now out of date.
1045          */
1046         mm = current->active_mm;
1047         if (unlikely(!mm || (mm == &init_mm)))
1048                 return;
1049
1050         spin_lock_irqsave(&mm->context.lock, flags);
1051
1052         if (unlikely(!CTX_VALID(mm->context)))
1053                 get_new_mmu_context(mm);
1054
1055         spin_unlock_irqrestore(&mm->context.lock, flags);
1056
1057         load_secondary_context(mm);
1058         __flush_tlb_mm(CTX_HWBITS(mm->context),
1059                        SECONDARY_CONTEXT);
1060 }
1061
1062 void smp_new_mmu_context_version(void)
1063 {
1064         smp_cross_call(&xcall_new_mmu_context_version, 0, 0, 0);
1065 }
1066
1067 void smp_report_regs(void)
1068 {
1069         smp_cross_call(&xcall_report_regs, 0, 0, 0);
1070 }
1071
1072 /* We know that the window frames of the user have been flushed
1073  * to the stack before we get here because all callers of us
1074  * are flush_tlb_*() routines, and these run after flush_cache_*()
1075  * which performs the flushw.
1076  *
1077  * The SMP TLB coherency scheme we use works as follows:
1078  *
1079  * 1) mm->cpu_vm_mask is a bit mask of which cpus an address
1080  *    space has (potentially) executed on, this is the heuristic
1081  *    we use to avoid doing cross calls.
1082  *
1083  *    Also, for flushing from kswapd and also for clones, we
1084  *    use cpu_vm_mask as the list of cpus to make run the TLB.
1085  *
1086  * 2) TLB context numbers are shared globally across all processors
1087  *    in the system, this allows us to play several games to avoid
1088  *    cross calls.
1089  *
1090  *    One invariant is that when a cpu switches to a process, and
1091  *    that processes tsk->active_mm->cpu_vm_mask does not have the
1092  *    current cpu's bit set, that tlb context is flushed locally.
1093  *
1094  *    If the address space is non-shared (ie. mm->count == 1) we avoid
1095  *    cross calls when we want to flush the currently running process's
1096  *    tlb state.  This is done by clearing all cpu bits except the current
1097  *    processor's in current->active_mm->cpu_vm_mask and performing the
1098  *    flush locally only.  This will force any subsequent cpus which run
1099  *    this task to flush the context from the local tlb if the process
1100  *    migrates to another cpu (again).
1101  *
1102  * 3) For shared address spaces (threads) and swapping we bite the
1103  *    bullet for most cases and perform the cross call (but only to
1104  *    the cpus listed in cpu_vm_mask).
1105  *
1106  *    The performance gain from "optimizing" away the cross call for threads is
1107  *    questionable (in theory the big win for threads is the massive sharing of
1108  *    address space state across processors).
1109  */
1110
1111 /* This currently is only used by the hugetlb arch pre-fault
1112  * hook on UltraSPARC-III+ and later when changing the pagesize
1113  * bits of the context register for an address space.
1114  */
1115 void smp_flush_tlb_mm(struct mm_struct *mm)
1116 {
1117         u32 ctx = CTX_HWBITS(mm->context);
1118         int cpu = get_cpu();
1119
1120         if (atomic_read(&mm->mm_users) == 1) {
1121                 mm->cpu_vm_mask = cpumask_of_cpu(cpu);
1122                 goto local_flush_and_out;
1123         }
1124
1125         smp_cross_call_masked(&xcall_flush_tlb_mm,
1126                               ctx, 0, 0,
1127                               mm->cpu_vm_mask);
1128
1129 local_flush_and_out:
1130         __flush_tlb_mm(ctx, SECONDARY_CONTEXT);
1131
1132         put_cpu();
1133 }
1134
1135 void smp_flush_tlb_pending(struct mm_struct *mm, unsigned long nr, unsigned long *vaddrs)
1136 {
1137         u32 ctx = CTX_HWBITS(mm->context);
1138         int cpu = get_cpu();
1139
1140         if (mm == current->active_mm && atomic_read(&mm->mm_users) == 1)
1141                 mm->cpu_vm_mask = cpumask_of_cpu(cpu);
1142         else
1143                 smp_cross_call_masked(&xcall_flush_tlb_pending,
1144                                       ctx, nr, (unsigned long) vaddrs,
1145                                       mm->cpu_vm_mask);
1146
1147         __flush_tlb_pending(ctx, nr, vaddrs);
1148
1149         put_cpu();
1150 }
1151
1152 void smp_flush_tlb_kernel_range(unsigned long start, unsigned long end)
1153 {
1154         start &= PAGE_MASK;
1155         end    = PAGE_ALIGN(end);
1156         if (start != end) {
1157                 smp_cross_call(&xcall_flush_tlb_kernel_range,
1158                                0, start, end);
1159
1160                 __flush_tlb_kernel_range(start, end);
1161         }
1162 }
1163
1164 /* CPU capture. */
1165 /* #define CAPTURE_DEBUG */
1166 extern unsigned long xcall_capture;
1167
1168 static atomic_t smp_capture_depth = ATOMIC_INIT(0);
1169 static atomic_t smp_capture_registry = ATOMIC_INIT(0);
1170 static unsigned long penguins_are_doing_time;
1171
1172 void smp_capture(void)
1173 {
1174         int result = atomic_add_ret(1, &smp_capture_depth);
1175
1176         if (result == 1) {
1177                 int ncpus = num_online_cpus();
1178
1179 #ifdef CAPTURE_DEBUG
1180                 printk("CPU[%d]: Sending penguins to jail...",
1181                        smp_processor_id());
1182 #endif
1183                 penguins_are_doing_time = 1;
1184                 membar_storestore_loadstore();
1185                 atomic_inc(&smp_capture_registry);
1186                 smp_cross_call(&xcall_capture, 0, 0, 0);
1187                 while (atomic_read(&smp_capture_registry) != ncpus)
1188                         rmb();
1189 #ifdef CAPTURE_DEBUG
1190                 printk("done\n");
1191 #endif
1192         }
1193 }
1194
1195 void smp_release(void)
1196 {
1197         if (atomic_dec_and_test(&smp_capture_depth)) {
1198 #ifdef CAPTURE_DEBUG
1199                 printk("CPU[%d]: Giving pardon to "
1200                        "imprisoned penguins\n",
1201                        smp_processor_id());
1202 #endif
1203                 penguins_are_doing_time = 0;
1204                 membar_storeload_storestore();
1205                 atomic_dec(&smp_capture_registry);
1206         }
1207 }
1208
1209 /* Imprisoned penguins run with %pil == 15, but PSTATE_IE set, so they
1210  * can service tlb flush xcalls...
1211  */
1212 extern void prom_world(int);
1213
1214 void smp_penguin_jailcell(int irq, struct pt_regs *regs)
1215 {
1216         clear_softint(1 << irq);
1217
1218         preempt_disable();
1219
1220         __asm__ __volatile__("flushw");
1221         prom_world(1);
1222         atomic_inc(&smp_capture_registry);
1223         membar_storeload_storestore();
1224         while (penguins_are_doing_time)
1225                 rmb();
1226         atomic_dec(&smp_capture_registry);
1227         prom_world(0);
1228
1229         preempt_enable();
1230 }
1231
1232 /* /proc/profile writes can call this, don't __init it please. */
1233 int setup_profiling_timer(unsigned int multiplier)
1234 {
1235         return -EINVAL;
1236 }
1237
1238 void __init smp_prepare_cpus(unsigned int max_cpus)
1239 {
1240 }
1241
1242 void __devinit smp_prepare_boot_cpu(void)
1243 {
1244 }
1245
1246 void __devinit smp_fill_in_sib_core_maps(void)
1247 {
1248         unsigned int i;
1249
1250         for_each_present_cpu(i) {
1251                 unsigned int j;
1252
1253                 cpus_clear(cpu_core_map[i]);
1254                 if (cpu_data(i).core_id == 0) {
1255                         cpu_set(i, cpu_core_map[i]);
1256                         continue;
1257                 }
1258
1259                 for_each_present_cpu(j) {
1260                         if (cpu_data(i).core_id ==
1261                             cpu_data(j).core_id)
1262                                 cpu_set(j, cpu_core_map[i]);
1263                 }
1264         }
1265
1266         for_each_present_cpu(i) {
1267                 unsigned int j;
1268
1269                 cpus_clear(per_cpu(cpu_sibling_map, i));
1270                 if (cpu_data(i).proc_id == -1) {
1271                         cpu_set(i, per_cpu(cpu_sibling_map, i));
1272                         continue;
1273                 }
1274
1275                 for_each_present_cpu(j) {
1276                         if (cpu_data(i).proc_id ==
1277                             cpu_data(j).proc_id)
1278                                 cpu_set(j, per_cpu(cpu_sibling_map, i));
1279                 }
1280         }
1281 }
1282
1283 int __cpuinit __cpu_up(unsigned int cpu)
1284 {
1285         int ret = smp_boot_one_cpu(cpu);
1286
1287         if (!ret) {
1288                 cpu_set(cpu, smp_commenced_mask);
1289                 while (!cpu_isset(cpu, cpu_online_map))
1290                         mb();
1291                 if (!cpu_isset(cpu, cpu_online_map)) {
1292                         ret = -ENODEV;
1293                 } else {
1294                         /* On SUN4V, writes to %tick and %stick are
1295                          * not allowed.
1296                          */
1297                         if (tlb_type != hypervisor)
1298                                 smp_synchronize_one_tick(cpu);
1299                 }
1300         }
1301         return ret;
1302 }
1303
1304 #ifdef CONFIG_HOTPLUG_CPU
1305 void cpu_play_dead(void)
1306 {
1307         int cpu = smp_processor_id();
1308         unsigned long pstate;
1309
1310         idle_task_exit();
1311
1312         if (tlb_type == hypervisor) {
1313                 struct trap_per_cpu *tb = &trap_block[cpu];
1314
1315                 sun4v_cpu_qconf(HV_CPU_QUEUE_CPU_MONDO,
1316                                 tb->cpu_mondo_pa, 0);
1317                 sun4v_cpu_qconf(HV_CPU_QUEUE_DEVICE_MONDO,
1318                                 tb->dev_mondo_pa, 0);
1319                 sun4v_cpu_qconf(HV_CPU_QUEUE_RES_ERROR,
1320                                 tb->resum_mondo_pa, 0);
1321                 sun4v_cpu_qconf(HV_CPU_QUEUE_NONRES_ERROR,
1322                                 tb->nonresum_mondo_pa, 0);
1323         }
1324
1325         cpu_clear(cpu, smp_commenced_mask);
1326         membar_safe("#Sync");
1327
1328         local_irq_disable();
1329
1330         __asm__ __volatile__(
1331                 "rdpr   %%pstate, %0\n\t"
1332                 "wrpr   %0, %1, %%pstate"
1333                 : "=r" (pstate)
1334                 : "i" (PSTATE_IE));
1335
1336         while (1)
1337                 barrier();
1338 }
1339
1340 int __cpu_disable(void)
1341 {
1342         int cpu = smp_processor_id();
1343         cpuinfo_sparc *c;
1344         int i;
1345
1346         for_each_cpu_mask(i, cpu_core_map[cpu])
1347                 cpu_clear(cpu, cpu_core_map[i]);
1348         cpus_clear(cpu_core_map[cpu]);
1349
1350         for_each_cpu_mask(i, per_cpu(cpu_sibling_map, cpu))
1351                 cpu_clear(cpu, per_cpu(cpu_sibling_map, i));
1352         cpus_clear(per_cpu(cpu_sibling_map, cpu));
1353
1354         c = &cpu_data(cpu);
1355
1356         c->core_id = 0;
1357         c->proc_id = -1;
1358
1359         spin_lock(&call_lock);
1360         cpu_clear(cpu, cpu_online_map);
1361         spin_unlock(&call_lock);
1362
1363         smp_wmb();
1364
1365         /* Make sure no interrupts point to this cpu.  */
1366         fixup_irqs();
1367
1368         local_irq_enable();
1369         mdelay(1);
1370         local_irq_disable();
1371
1372         return 0;
1373 }
1374
1375 void __cpu_die(unsigned int cpu)
1376 {
1377         int i;
1378
1379         for (i = 0; i < 100; i++) {
1380                 smp_rmb();
1381                 if (!cpu_isset(cpu, smp_commenced_mask))
1382                         break;
1383                 msleep(100);
1384         }
1385         if (cpu_isset(cpu, smp_commenced_mask)) {
1386                 printk(KERN_ERR "CPU %u didn't die...\n", cpu);
1387         } else {
1388 #if defined(CONFIG_SUN_LDOMS)
1389                 unsigned long hv_err;
1390                 int limit = 100;
1391
1392                 do {
1393                         hv_err = sun4v_cpu_stop(cpu);
1394                         if (hv_err == HV_EOK) {
1395                                 cpu_clear(cpu, cpu_present_map);
1396                                 break;
1397                         }
1398                 } while (--limit > 0);
1399                 if (limit <= 0) {
1400                         printk(KERN_ERR "sun4v_cpu_stop() fails err=%lu\n",
1401                                hv_err);
1402                 }
1403 #endif
1404         }
1405 }
1406 #endif
1407
1408 void __init smp_cpus_done(unsigned int max_cpus)
1409 {
1410 }
1411
1412 void smp_send_reschedule(int cpu)
1413 {
1414         smp_receive_signal(cpu);
1415 }
1416
1417 /* This is a nop because we capture all other cpus
1418  * anyways when making the PROM active.
1419  */
1420 void smp_send_stop(void)
1421 {
1422 }
1423
1424 unsigned long __per_cpu_base __read_mostly;
1425 unsigned long __per_cpu_shift __read_mostly;
1426
1427 EXPORT_SYMBOL(__per_cpu_base);
1428 EXPORT_SYMBOL(__per_cpu_shift);
1429
1430 void __init real_setup_per_cpu_areas(void)
1431 {
1432         unsigned long goal, size, i;
1433         char *ptr;
1434
1435         /* Copy section for each CPU (we discard the original) */
1436         goal = PERCPU_ENOUGH_ROOM;
1437
1438         __per_cpu_shift = PAGE_SHIFT;
1439         for (size = PAGE_SIZE; size < goal; size <<= 1UL)
1440                 __per_cpu_shift++;
1441
1442         ptr = alloc_bootmem_pages(size * NR_CPUS);
1443
1444         __per_cpu_base = ptr - __per_cpu_start;
1445
1446         for (i = 0; i < NR_CPUS; i++, ptr += size)
1447                 memcpy(ptr, __per_cpu_start, __per_cpu_end - __per_cpu_start);
1448
1449         /* Setup %g5 for the boot cpu.  */
1450         __local_per_cpu_offset = __per_cpu_offset(smp_processor_id());
1451 }