arch/alpha/kernel/smp.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *      linux/arch/alpha/kernel/smp.c
   4  *
   5  *      2001-07-09 Phil Ezolt (Phillip.Ezolt@compaq.com)
   6  *            Renamed modified smp_call_function to smp_call_function_on_cpu()
   7  *            Created an function that conforms to the old calling convention
   8  *            of smp_call_function().
   9  *
  10  *            This is helpful for DCPI.
  11  *
  12  */
  13
  14 #include <linux/errno.h>
  15 #include <linux/kernel.h>
  16 #include <linux/kernel_stat.h>
  17 #include <linux/module.h>
  18 #include <linux/sched/mm.h>
  19 #include <linux/mm.h>
  20 #include <linux/err.h>
  21 #include <linux/threads.h>
  22 #include <linux/smp.h>
  23 #include <linux/interrupt.h>
  24 #include <linux/init.h>
  25 #include <linux/delay.h>
  26 #include <linux/spinlock.h>
  27 #include <linux/irq.h>
  28 #include <linux/cache.h>
  29 #include <linux/profile.h>
  30 #include <linux/bitops.h>
  31 #include <linux/cpu.h>
  32
  33 #include <asm/hwrpb.h>
  34 #include <asm/ptrace.h>
  35 #include <linux/atomic.h>
  36
  37 #include <asm/io.h>
  38 #include <asm/irq.h>
  39 #include <asm/pgtable.h>
  40 #include <asm/pgalloc.h>
  41 #include <asm/mmu_context.h>
  42 #include <asm/tlbflush.h>
  43
  44 #include "proto.h"
  45 #include "irq_impl.h"
  46
  47
  48 #define DEBUG_SMP 0
  49 #if DEBUG_SMP
  50 #define DBGS(args)      printk args
  51 #else
  52 #define DBGS(args)
  53 #endif
  54
  55 /* A collection of per-processor data.  */
  56 struct cpuinfo_alpha cpu_data[NR_CPUS];
  57 EXPORT_SYMBOL(cpu_data);
  58
  59 /* A collection of single bit ipi messages.  */
  60 static struct {
  61         unsigned long bits ____cacheline_aligned;
  62 } ipi_data[NR_CPUS] __cacheline_aligned;
  63
  64 enum ipi_message_type {
  65         IPI_RESCHEDULE,
  66         IPI_CALL_FUNC,
  67         IPI_CPU_STOP,
  68 };
  69
  70 /* Set to a secondary's cpuid when it comes online.  */
  71 static int smp_secondary_alive = 0;
  72
  73 int smp_num_probed;             /* Internal processor count */
  74 int smp_num_cpus = 1;           /* Number that came online.  */
  75 EXPORT_SYMBOL(smp_num_cpus);
  76
  77 /*
  78  * Called by both boot and secondaries to move global data into
  79  *  per-processor storage.
  80  */
  81 static inline void __init
  82 smp_store_cpu_info(int cpuid)
  83 {
  84         cpu_data[cpuid].loops_per_jiffy = loops_per_jiffy;
  85         cpu_data[cpuid].last_asn = ASN_FIRST_VERSION;
  86         cpu_data[cpuid].need_new_asn = 0;
  87         cpu_data[cpuid].asn_lock = 0;
  88 }
  89
  90 /*
  91  * Ideally sets up per-cpu profiling hooks.  Doesn't do much now...
  92  */
  93 static inline void __init
  94 smp_setup_percpu_timer(int cpuid)
  95 {
  96         cpu_data[cpuid].prof_counter = 1;
  97         cpu_data[cpuid].prof_multiplier = 1;
  98 }
  99
 100 static void __init
 101 wait_boot_cpu_to_stop(int cpuid)
 102 {
 103         unsigned long stop = jiffies + 10*HZ;
 104
 105         while (time_before(jiffies, stop)) {
 106                 if (!smp_secondary_alive)
 107                         return;
 108                 barrier();
 109         }
 110
 111         printk("wait_boot_cpu_to_stop: FAILED on CPU %d, hanging now\n", cpuid);
 112         for (;;)
 113                 barrier();
 114 }
 115
 116 /*
 117  * Where secondaries begin a life of C.
 118  */
 119 void __init
 120 smp_callin(void)
 121 {
 122         int cpuid = hard_smp_processor_id();
 123
 124         if (cpu_online(cpuid)) {
 125                 printk("??, cpu 0x%x already present??\n", cpuid);
 126                 BUG();
 127         }
 128         set_cpu_online(cpuid, true);
 129
 130         /* Turn on machine checks.  */
 131         wrmces(7);
 132
 133         /* Set trap vectors.  */
 134         trap_init();
 135
 136         /* Set interrupt vector.  */
 137         wrent(entInt, 0);
 138
 139         /* Get our local ticker going. */
 140         smp_setup_percpu_timer(cpuid);
 141         init_clockevent();
 142
 143         /* Call platform-specific callin, if specified */
 144         if (alpha_mv.smp_callin)
 145                 alpha_mv.smp_callin();
 146
 147         /* All kernel threads share the same mm context.  */
 148         mmgrab(&init_mm);
 149         current->active_mm = &init_mm;
 150
 151         /* inform the notifiers about the new cpu */
 152         notify_cpu_starting(cpuid);
 153
 154         /* Must have completely accurate bogos.  */
 155         local_irq_enable();
 156
 157         /* Wait boot CPU to stop with irq enabled before running
 158            calibrate_delay. */
 159         wait_boot_cpu_to_stop(cpuid);
 160         mb();
 161         calibrate_delay();
 162
 163         smp_store_cpu_info(cpuid);
 164         /* Allow master to continue only after we written loops_per_jiffy.  */
 165         wmb();
 166         smp_secondary_alive = 1;
 167
 168         DBGS(("smp_callin: commencing CPU %d current %p active_mm %p\n",
 169               cpuid, current, current->active_mm));
 170
 171         preempt_disable();
 172         cpu_startup_entry(CPUHP_AP_ONLINE_IDLE);
 173 }
 174
 175 /* Wait until hwrpb->txrdy is clear for cpu.  Return -1 on timeout.  */
 176 static int
 177 wait_for_txrdy (unsigned long cpumask)
 178 {
 179         unsigned long timeout;
 180
 181         if (!(hwrpb->txrdy & cpumask))
 182                 return 0;
 183
 184         timeout = jiffies + 10*HZ;
 185         while (time_before(jiffies, timeout)) {
 186                 if (!(hwrpb->txrdy & cpumask))
 187                         return 0;
 188                 udelay(10);
 189                 barrier();
 190         }
 191
 192         return -1;
 193 }
 194
 195 /*
 196  * Send a message to a secondary's console.  "START" is one such
 197  * interesting message.  ;-)
 198  */
 199 static void
 200 send_secondary_console_msg(char *str, int cpuid)
 201 {
 202         struct percpu_struct *cpu;
 203         register char *cp1, *cp2;
 204         unsigned long cpumask;
 205         size_t len;
 206
 207         cpu = (struct percpu_struct *)
 208                 ((char*)hwrpb
 209                  + hwrpb->processor_offset
 210                  + cpuid * hwrpb->processor_size);
 211
 212         cpumask = (1UL << cpuid);
 213         if (wait_for_txrdy(cpumask))
 214                 goto timeout;
 215
 216         cp2 = str;
 217         len = strlen(cp2);
 218         *(unsigned int *)&cpu->ipc_buffer[0] = len;
 219         cp1 = (char *) &cpu->ipc_buffer[1];
 220         memcpy(cp1, cp2, len);
 221
 222         /* atomic test and set */
 223         wmb();
 224         set_bit(cpuid, &hwrpb->rxrdy);
 225
 226         if (wait_for_txrdy(cpumask))
 227                 goto timeout;
 228         return;
 229
 230  timeout:
 231         printk("Processor %x not ready\n", cpuid);
 232 }
 233
 234 /*
 235  * A secondary console wants to send a message.  Receive it.
 236  */
 237 static void
 238 recv_secondary_console_msg(void)
 239 {
 240         int mycpu, i, cnt;
 241         unsigned long txrdy = hwrpb->txrdy;
 242         char *cp1, *cp2, buf[80];
 243         struct percpu_struct *cpu;
 244
 245         DBGS(("recv_secondary_console_msg: TXRDY 0x%lx.\n", txrdy));
 246
 247         mycpu = hard_smp_processor_id();
 248
 249         for (i = 0; i < NR_CPUS; i++) {
 250                 if (!(txrdy & (1UL << i)))
 251                         continue;
 252
 253                 DBGS(("recv_secondary_console_msg: "
 254                       "TXRDY contains CPU %d.\n", i));
 255
 256                 cpu = (struct percpu_struct *)
 257                   ((char*)hwrpb
 258                    + hwrpb->processor_offset
 259                    + i * hwrpb->processor_size);
 260
 261                 DBGS(("recv_secondary_console_msg: on %d from %d"
 262                       " HALT_REASON 0x%lx FLAGS 0x%lx\n",
 263                       mycpu, i, cpu->halt_reason, cpu->flags));
 264
 265                 cnt = cpu->ipc_buffer[0] >> 32;
 266                 if (cnt <= 0 || cnt >= 80)
 267                         strcpy(buf, "<<< BOGUS MSG >>>");
 268                 else {
 269                         cp1 = (char *) &cpu->ipc_buffer[1];
 270                         cp2 = buf;
 271                         memcpy(cp2, cp1, cnt);
 272                         cp2[cnt] = '\0';
 273
 274                         while ((cp2 = strchr(cp2, '\r')) != 0) {
 275                                 *cp2 = ' ';
 276                                 if (cp2[1] == '\n')
 277                                         cp2[1] = ' ';
 278                         }
 279                 }
 280
 281                 DBGS((KERN_INFO "recv_secondary_console_msg: on %d "
 282                       "message is '%s'\n", mycpu, buf));
 283         }
 284
 285         hwrpb->txrdy = 0;
 286 }
 287
 288 /*
 289  * Convince the console to have a secondary cpu begin execution.
 290  */
 291 static int
 292 secondary_cpu_start(int cpuid, struct task_struct *idle)
 293 {
 294         struct percpu_struct *cpu;
 295         struct pcb_struct *hwpcb, *ipcb;
 296         unsigned long timeout;
 297
 298         cpu = (struct percpu_struct *)
 299                 ((char*)hwrpb
 300                  + hwrpb->processor_offset
 301                  + cpuid * hwrpb->processor_size);
 302         hwpcb = (struct pcb_struct *) cpu->hwpcb;
 303         ipcb = &task_thread_info(idle)->pcb;
 304
 305         /* Initialize the CPU's HWPCB to something just good enough for
 306            us to get started.  Immediately after starting, we'll swpctx
 307            to the target idle task's pcb.  Reuse the stack in the mean
 308            time.  Precalculate the target PCBB.  */
 309         hwpcb->ksp = (unsigned long)ipcb + sizeof(union thread_union) - 16;
 310         hwpcb->usp = 0;
 311         hwpcb->ptbr = ipcb->ptbr;
 312         hwpcb->pcc = 0;
 313         hwpcb->asn = 0;
 314         hwpcb->unique = virt_to_phys(ipcb);
 315         hwpcb->flags = ipcb->flags;
 316         hwpcb->res1 = hwpcb->res2 = 0;
 317
 318 #if 0
 319         DBGS(("KSP 0x%lx PTBR 0x%lx VPTBR 0x%lx UNIQUE 0x%lx\n",
 320               hwpcb->ksp, hwpcb->ptbr, hwrpb->vptb, hwpcb->unique));
 321 #endif
 322         DBGS(("Starting secondary cpu %d: state 0x%lx pal_flags 0x%lx\n",
 323               cpuid, idle->state, ipcb->flags));
 324
 325         /* Setup HWRPB fields that SRM uses to activate secondary CPU */
 326         hwrpb->CPU_restart = __smp_callin;
 327         hwrpb->CPU_restart_data = (unsigned long) __smp_callin;
 328
 329         /* Recalculate and update the HWRPB checksum */
 330         hwrpb_update_checksum(hwrpb);
 331
 332         /*
 333          * Send a "start" command to the specified processor.
 334          */
 335
 336         /* SRM III 3.4.1.3 */
 337         cpu->flags |= 0x22;     /* turn on Context Valid and Restart Capable */
 338         cpu->flags &= ~1;       /* turn off Bootstrap In Progress */
 339         wmb();
 340
 341         send_secondary_console_msg("START\r\n", cpuid);
 342
 343         /* Wait 10 seconds for an ACK from the console.  */
 344         timeout = jiffies + 10*HZ;
 345         while (time_before(jiffies, timeout)) {
 346                 if (cpu->flags & 1)
 347                         goto started;
 348                 udelay(10);
 349                 barrier();
 350         }
 351         printk(KERN_ERR "SMP: Processor %d failed to start.\n", cpuid);
 352         return -1;
 353
 354  started:
 355         DBGS(("secondary_cpu_start: SUCCESS for CPU %d!!!\n", cpuid));
 356         return 0;
 357 }
 358
 359 /*
 360  * Bring one cpu online.
 361  */
 362 static int
 363 smp_boot_one_cpu(int cpuid, struct task_struct *idle)
 364 {
 365         unsigned long timeout;
 366
 367         /* Signal the secondary to wait a moment.  */
 368         smp_secondary_alive = -1;
 369
 370         /* Whirrr, whirrr, whirrrrrrrrr... */
 371         if (secondary_cpu_start(cpuid, idle))
 372                 return -1;
 373
 374         /* Notify the secondary CPU it can run calibrate_delay.  */
 375         mb();
 376         smp_secondary_alive = 0;
 377
 378         /* We've been acked by the console; wait one second for
 379            the task to start up for real.  */
 380         timeout = jiffies + 1*HZ;
 381         while (time_before(jiffies, timeout)) {
 382                 if (smp_secondary_alive == 1)
 383                         goto alive;
 384                 udelay(10);
 385                 barrier();
 386         }
 387
 388         /* We failed to boot the CPU.  */
 389
 390         printk(KERN_ERR "SMP: Processor %d is stuck.\n", cpuid);
 391         return -1;
 392
 393  alive:
 394         /* Another "Red Snapper". */
 395         return 0;
 396 }
 397
 398 /*
 399  * Called from setup_arch.  Detect an SMP system and which processors
 400  * are present.
 401  */
 402 void __init
 403 setup_smp(void)
 404 {
 405         struct percpu_struct *cpubase, *cpu;
 406         unsigned long i;
 407
 408         if (boot_cpuid != 0) {
 409                 printk(KERN_WARNING "SMP: Booting off cpu %d instead of 0?\n",
 410                        boot_cpuid);
 411         }
 412
 413         if (hwrpb->nr_processors > 1) {
 414                 int boot_cpu_palrev;
 415
 416                 DBGS(("setup_smp: nr_processors %ld\n",
 417                       hwrpb->nr_processors));
 418
 419                 cpubase = (struct percpu_struct *)
 420                         ((char*)hwrpb + hwrpb->processor_offset);
 421                 boot_cpu_palrev = cpubase->pal_revision;
 422
 423                 for (i = 0; i < hwrpb->nr_processors; i++) {
 424                         cpu = (struct percpu_struct *)
 425                                 ((char *)cpubase + i*hwrpb->processor_size);
 426                         if ((cpu->flags & 0x1cc) == 0x1cc) {
 427                                 smp_num_probed++;
 428                                 set_cpu_possible(i, true);
 429                                 set_cpu_present(i, true);
 430                                 cpu->pal_revision = boot_cpu_palrev;
 431                         }
 432
 433                         DBGS(("setup_smp: CPU %d: flags 0x%lx type 0x%lx\n",
 434                               i, cpu->flags, cpu->type));
 435                         DBGS(("setup_smp: CPU %d: PAL rev 0x%lx\n",
 436                               i, cpu->pal_revision));
 437                 }
 438         } else {
 439                 smp_num_probed = 1;
 440         }
 441
 442         printk(KERN_INFO "SMP: %d CPUs probed -- cpu_present_mask = %lx\n",
 443                smp_num_probed, cpumask_bits(cpu_present_mask)[0]);
 444 }
 445
 446 /*
 447  * Called by smp_init prepare the secondaries
 448  */
 449 void __init
 450 smp_prepare_cpus(unsigned int max_cpus)
 451 {
 452         /* Take care of some initial bookkeeping.  */
 453         memset(ipi_data, 0, sizeof(ipi_data));
 454
 455         current_thread_info()->cpu = boot_cpuid;
 456
 457         smp_store_cpu_info(boot_cpuid);
 458         smp_setup_percpu_timer(boot_cpuid);
 459
 460         /* Nothing to do on a UP box, or when told not to.  */
 461         if (smp_num_probed == 1 || max_cpus == 0) {
 462                 init_cpu_possible(cpumask_of(boot_cpuid));
 463                 init_cpu_present(cpumask_of(boot_cpuid));
 464                 printk(KERN_INFO "SMP mode deactivated.\n");
 465                 return;
 466         }
 467
 468         printk(KERN_INFO "SMP starting up secondaries.\n");
 469
 470         smp_num_cpus = smp_num_probed;
 471 }
 472
 473 void
 474 smp_prepare_boot_cpu(void)
 475 {
 476 }
 477
 478 int
 479 __cpu_up(unsigned int cpu, struct task_struct *tidle)
 480 {
 481         smp_boot_one_cpu(cpu, tidle);
 482
 483         return cpu_online(cpu) ? 0 : -ENOSYS;
 484 }
 485
 486 void __init
 487 smp_cpus_done(unsigned int max_cpus)
 488 {
 489         int cpu;
 490         unsigned long bogosum = 0;
 491
 492         for(cpu = 0; cpu < NR_CPUS; cpu++)
 493                 if (cpu_online(cpu))
 494                         bogosum += cpu_data[cpu].loops_per_jiffy;
 495
 496         printk(KERN_INFO "SMP: Total of %d processors activated "
 497                "(%lu.%02lu BogoMIPS).\n",
 498                num_online_cpus(),
 499                (bogosum + 2500) / (500000/HZ),
 500                ((bogosum + 2500) / (5000/HZ)) % 100);
 501 }
 502
 503 int
 504 setup_profiling_timer(unsigned int multiplier)
 505 {
 506         return -EINVAL;
 507 }
 508
 509 static void
 510 send_ipi_message(const struct cpumask *to_whom, enum ipi_message_type operation)
 511 {
 512         int i;
 513
 514         mb();
 515         for_each_cpu(i, to_whom)
 516                 set_bit(operation, &ipi_data[i].bits);
 517
 518         mb();
 519         for_each_cpu(i, to_whom)
 520                 wripir(i);
 521 }
 522
 523 void
 524 handle_ipi(struct pt_regs *regs)
 525 {
 526         int this_cpu = smp_processor_id();
 527         unsigned long *pending_ipis = &ipi_data[this_cpu].bits;
 528         unsigned long ops;
 529
 530 #if 0
 531         DBGS(("handle_ipi: on CPU %d ops 0x%lx PC 0x%lx\n",
 532               this_cpu, *pending_ipis, regs->pc));
 533 #endif
 534
 535         mb();   /* Order interrupt and bit testing. */
 536         while ((ops = xchg(pending_ipis, 0)) != 0) {
 537           mb(); /* Order bit clearing and data access. */
 538           do {
 539                 unsigned long which;
 540
 541                 which = ops & -ops;
 542                 ops &= ~which;
 543                 which = __ffs(which);
 544
 545                 switch (which) {
 546                 case IPI_RESCHEDULE:
 547                         scheduler_ipi();
 548                         break;
 549
 550                 case IPI_CALL_FUNC:
 551                         generic_smp_call_function_interrupt();
 552                         break;
 553
 554                 case IPI_CPU_STOP:
 555                         halt();
 556
 557                 default:
 558                         printk(KERN_CRIT "Unknown IPI on CPU %d: %lu\n",
 559                                this_cpu, which);
 560                         break;
 561                 }
 562           } while (ops);
 563
 564           mb(); /* Order data access and bit testing. */
 565         }
 566
 567         cpu_data[this_cpu].ipi_count++;
 568
 569         if (hwrpb->txrdy)
 570                 recv_secondary_console_msg();
 571 }
 572
 573 void
 574 smp_send_reschedule(int cpu)
 575 {
 576 #ifdef DEBUG_IPI_MSG
 577         if (cpu == hard_smp_processor_id())
 578                 printk(KERN_WARNING
 579                        "smp_send_reschedule: Sending IPI to self.\n");
 580 #endif
 581         send_ipi_message(cpumask_of(cpu), IPI_RESCHEDULE);
 582 }
 583
 584 void
 585 smp_send_stop(void)
 586 {
 587         cpumask_t to_whom;
 588         cpumask_copy(&to_whom, cpu_possible_mask);
 589         cpumask_clear_cpu(smp_processor_id(), &to_whom);
 590 #ifdef DEBUG_IPI_MSG
 591         if (hard_smp_processor_id() != boot_cpu_id)
 592                 printk(KERN_WARNING "smp_send_stop: Not on boot cpu.\n");
 593 #endif
 594         send_ipi_message(&to_whom, IPI_CPU_STOP);
 595 }
 596
 597 void arch_send_call_function_ipi_mask(const struct cpumask *mask)
 598 {
 599         send_ipi_message(mask, IPI_CALL_FUNC);
 600 }
 601
 602 void arch_send_call_function_single_ipi(int cpu)
 603 {
 604         send_ipi_message(cpumask_of(cpu), IPI_CALL_FUNC);
 605 }
 606
 607 static void
 608 ipi_imb(void *ignored)
 609 {
 610         imb();
 611 }
 612
 613 void
 614 smp_imb(void)
 615 {
 616         /* Must wait other processors to flush their icache before continue. */
 617         if (on_each_cpu(ipi_imb, NULL, 1))
 618                 printk(KERN_CRIT "smp_imb: timed out\n");
 619 }
 620 EXPORT_SYMBOL(smp_imb);
 621
 622 static void
 623 ipi_flush_tlb_all(void *ignored)
 624 {
 625         tbia();
 626 }
 627
 628 void
 629 flush_tlb_all(void)
 630 {
 631         /* Although we don't have any data to pass, we do want to
 632            synchronize with the other processors.  */
 633         if (on_each_cpu(ipi_flush_tlb_all, NULL, 1)) {
 634                 printk(KERN_CRIT "flush_tlb_all: timed out\n");
 635         }
 636 }
 637
 638 #define asn_locked() (cpu_data[smp_processor_id()].asn_lock)
 639
 640 static void
 641 ipi_flush_tlb_mm(void *x)
 642 {
 643         struct mm_struct *mm = (struct mm_struct *) x;
 644         if (mm == current->active_mm && !asn_locked())
 645                 flush_tlb_current(mm);
 646         else
 647                 flush_tlb_other(mm);
 648 }
 649
 650 void
 651 flush_tlb_mm(struct mm_struct *mm)
 652 {
 653         preempt_disable();
 654
 655         if (mm == current->active_mm) {
 656                 flush_tlb_current(mm);
 657                 if (atomic_read(&mm->mm_users) <= 1) {
 658                         int cpu, this_cpu = smp_processor_id();
 659                         for (cpu = 0; cpu < NR_CPUS; cpu++) {
 660                                 if (!cpu_online(cpu) || cpu == this_cpu)
 661                                         continue;
 662                                 if (mm->context[cpu])
 663                                         mm->context[cpu] = 0;
 664                         }
 665                         preempt_enable();
 666                         return;
 667                 }
 668         }
 669
 670         if (smp_call_function(ipi_flush_tlb_mm, mm, 1)) {
 671                 printk(KERN_CRIT "flush_tlb_mm: timed out\n");
 672         }
 673
 674         preempt_enable();
 675 }
 676 EXPORT_SYMBOL(flush_tlb_mm);
 677
 678 struct flush_tlb_page_struct {
 679         struct vm_area_struct *vma;
 680         struct mm_struct *mm;
 681         unsigned long addr;
 682 };
 683
 684 static void
 685 ipi_flush_tlb_page(void *x)
 686 {
 687         struct flush_tlb_page_struct *data = (struct flush_tlb_page_struct *)x;
 688         struct mm_struct * mm = data->mm;
 689
 690         if (mm == current->active_mm && !asn_locked())
 691                 flush_tlb_current_page(mm, data->vma, data->addr);
 692         else
 693                 flush_tlb_other(mm);
 694 }
 695
 696 void
 697 flush_tlb_page(struct vm_area_struct *vma, unsigned long addr)
 698 {
 699         struct flush_tlb_page_struct data;
 700         struct mm_struct *mm = vma->vm_mm;
 701
 702         preempt_disable();
 703
 704         if (mm == current->active_mm) {
 705                 flush_tlb_current_page(mm, vma, addr);
 706                 if (atomic_read(&mm->mm_users) <= 1) {
 707                         int cpu, this_cpu = smp_processor_id();
 708                         for (cpu = 0; cpu < NR_CPUS; cpu++) {
 709                                 if (!cpu_online(cpu) || cpu == this_cpu)
 710                                         continue;
 711                                 if (mm->context[cpu])
 712                                         mm->context[cpu] = 0;
 713                         }
 714                         preempt_enable();
 715                         return;
 716                 }
 717         }
 718
 719         data.vma = vma;
 720         data.mm = mm;
 721         data.addr = addr;
 722
 723         if (smp_call_function(ipi_flush_tlb_page, &data, 1)) {
 724                 printk(KERN_CRIT "flush_tlb_page: timed out\n");
 725         }
 726
 727         preempt_enable();
 728 }
 729 EXPORT_SYMBOL(flush_tlb_page);
 730
 731 void
 732 flush_tlb_range(struct vm_area_struct *vma, unsigned long start, unsigned long end)
 733 {
 734         /* On the Alpha we always flush the whole user tlb.  */
 735         flush_tlb_mm(vma->vm_mm);
 736 }
 737 EXPORT_SYMBOL(flush_tlb_range);
 738
 739 static void
 740 ipi_flush_icache_page(void *x)
 741 {
 742         struct mm_struct *mm = (struct mm_struct *) x;
 743         if (mm == current->active_mm && !asn_locked())
 744                 __load_new_mm_context(mm);
 745         else
 746                 flush_tlb_other(mm);
 747 }
 748
 749 void
 750 flush_icache_user_range(struct vm_area_struct *vma, struct page *page,
 751                         unsigned long addr, int len)
 752 {
 753         struct mm_struct *mm = vma->vm_mm;
 754
 755         if ((vma->vm_flags & VM_EXEC) == 0)
 756                 return;
 757
 758         preempt_disable();
 759
 760         if (mm == current->active_mm) {
 761                 __load_new_mm_context(mm);
 762                 if (atomic_read(&mm->mm_users) <= 1) {
 763                         int cpu, this_cpu = smp_processor_id();
 764                         for (cpu = 0; cpu < NR_CPUS; cpu++) {
 765                                 if (!cpu_online(cpu) || cpu == this_cpu)
 766                                         continue;
 767                                 if (mm->context[cpu])
 768                                         mm->context[cpu] = 0;
 769                         }
 770                         preempt_enable();
 771                         return;
 772                 }
 773         }
 774
 775         if (smp_call_function(ipi_flush_icache_page, mm, 1)) {
 776                 printk(KERN_CRIT "flush_icache_page: timed out\n");
 777         }
 778
 779         preempt_enable();
 780 }