arch/x86/oprofile/nmi_int.c

   1 /**
   2  * @file nmi_int.c
   3  *
   4  * @remark Copyright 2002-2009 OProfile authors
   5  * @remark Read the file COPYING
   6  *
   7  * @author John Levon <levon@movementarian.org>
   8  * @author Robert Richter <robert.richter@amd.com>
   9  * @author Barry Kasindorf <barry.kasindorf@amd.com>
  10  * @author Jason Yeh <jason.yeh@amd.com>
  11  * @author Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
  12  */
  13
  14 #include <linux/init.h>
  15 #include <linux/notifier.h>
  16 #include <linux/smp.h>
  17 #include <linux/oprofile.h>
  18 #include <linux/syscore_ops.h>
  19 #include <linux/slab.h>
  20 #include <linux/moduleparam.h>
  21 #include <linux/kdebug.h>
  22 #include <linux/cpu.h>
  23 #include <asm/nmi.h>
  24 #include <asm/msr.h>
  25 #include <asm/apic.h>
  26
  27 #include "op_counter.h"
  28 #include "op_x86_model.h"
  29
  30 static struct op_x86_model_spec *model;
  31 static DEFINE_PER_CPU(struct op_msrs, cpu_msrs);
  32 static DEFINE_PER_CPU(unsigned long, saved_lvtpc);
  33
  34 /* must be protected with get_online_cpus()/put_online_cpus(): */
  35 static int nmi_enabled;
  36 static int ctr_running;
  37
  38 struct op_counter_config counter_config[OP_MAX_COUNTER];
  39
  40 /* common functions */
  41
  42 u64 op_x86_get_ctrl(struct op_x86_model_spec const *model,
  43                     struct op_counter_config *counter_config)
  44 {
  45         u64 val = 0;
  46         u16 event = (u16)counter_config->event;
  47
  48         val |= ARCH_PERFMON_EVENTSEL_INT;
  49         val |= counter_config->user ? ARCH_PERFMON_EVENTSEL_USR : 0;
  50         val |= counter_config->kernel ? ARCH_PERFMON_EVENTSEL_OS : 0;
  51         val |= (counter_config->unit_mask & 0xFF) << 8;
  52         event &= model->event_mask ? model->event_mask : 0xFF;
  53         val |= event & 0xFF;
  54         val |= (event & 0x0F00) << 24;
  55
  56         return val;
  57 }
  58
  59
  60 static int profile_exceptions_notify(struct notifier_block *self,
  61                                      unsigned long val, void *data)
  62 {
  63         struct die_args *args = (struct die_args *)data;
  64         int ret = NOTIFY_DONE;
  65
  66         switch (val) {
  67         case DIE_NMI:
  68                 if (ctr_running)
  69                         model->check_ctrs(args->regs, &__get_cpu_var(cpu_msrs));
  70                 else if (!nmi_enabled)
  71                         break;
  72                 else
  73                         model->stop(&__get_cpu_var(cpu_msrs));
  74                 ret = NOTIFY_STOP;
  75                 break;
  76         default:
  77                 break;
  78         }
  79         return ret;
  80 }
  81
  82 static void nmi_cpu_save_registers(struct op_msrs *msrs)
  83 {
  84         struct op_msr *counters = msrs->counters;
  85         struct op_msr *controls = msrs->controls;
  86         unsigned int i;
  87
  88         for (i = 0; i < model->num_counters; ++i) {
  89                 if (counters[i].addr)
  90                         rdmsrl(counters[i].addr, counters[i].saved);
  91         }
  92
  93         for (i = 0; i < model->num_controls; ++i) {
  94                 if (controls[i].addr)
  95                         rdmsrl(controls[i].addr, controls[i].saved);
  96         }
  97 }
  98
  99 static void nmi_cpu_start(void *dummy)
 100 {
 101         struct op_msrs const *msrs = &__get_cpu_var(cpu_msrs);
 102         if (!msrs->controls)
 103                 WARN_ON_ONCE(1);
 104         else
 105                 model->start(msrs);
 106 }
 107
 108 static int nmi_start(void)
 109 {
 110         get_online_cpus();
 111         on_each_cpu(nmi_cpu_start, NULL, 1);
 112         ctr_running = 1;
 113         put_online_cpus();
 114         return 0;
 115 }
 116
 117 static void nmi_cpu_stop(void *dummy)
 118 {
 119         struct op_msrs const *msrs = &__get_cpu_var(cpu_msrs);
 120         if (!msrs->controls)
 121                 WARN_ON_ONCE(1);
 122         else
 123                 model->stop(msrs);
 124 }
 125
 126 static void nmi_stop(void)
 127 {
 128         get_online_cpus();
 129         on_each_cpu(nmi_cpu_stop, NULL, 1);
 130         ctr_running = 0;
 131         put_online_cpus();
 132 }
 133
 134 #ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX
 135
 136 static DEFINE_PER_CPU(int, switch_index);
 137
 138 static inline int has_mux(void)
 139 {
 140         return !!model->switch_ctrl;
 141 }
 142
 143 inline int op_x86_phys_to_virt(int phys)
 144 {
 145         return __this_cpu_read(switch_index) + phys;
 146 }
 147
 148 inline int op_x86_virt_to_phys(int virt)
 149 {
 150         return virt % model->num_counters;
 151 }
 152
 153 static void nmi_shutdown_mux(void)
 154 {
 155         int i;
 156
 157         if (!has_mux())
 158                 return;
 159
 160         for_each_possible_cpu(i) {
 161                 kfree(per_cpu(cpu_msrs, i).multiplex);
 162                 per_cpu(cpu_msrs, i).multiplex = NULL;
 163                 per_cpu(switch_index, i) = 0;
 164         }
 165 }
 166
 167 static int nmi_setup_mux(void)
 168 {
 169         size_t multiplex_size =
 170                 sizeof(struct op_msr) * model->num_virt_counters;
 171         int i;
 172
 173         if (!has_mux())
 174                 return 1;
 175
 176         for_each_possible_cpu(i) {
 177                 per_cpu(cpu_msrs, i).multiplex =
 178                         kzalloc(multiplex_size, GFP_KERNEL);
 179                 if (!per_cpu(cpu_msrs, i).multiplex)
 180                         return 0;
 181         }
 182
 183         return 1;
 184 }
 185
 186 static void nmi_cpu_setup_mux(int cpu, struct op_msrs const * const msrs)
 187 {
 188         int i;
 189         struct op_msr *multiplex = msrs->multiplex;
 190
 191         if (!has_mux())
 192                 return;
 193
 194         for (i = 0; i < model->num_virt_counters; ++i) {
 195                 if (counter_config[i].enabled) {
 196                         multiplex[i].saved = -(u64)counter_config[i].count;
 197                 } else {
 198                         multiplex[i].saved = 0;
 199                 }
 200         }
 201
 202         per_cpu(switch_index, cpu) = 0;
 203 }
 204
 205 static void nmi_cpu_save_mpx_registers(struct op_msrs *msrs)
 206 {
 207         struct op_msr *counters = msrs->counters;
 208         struct op_msr *multiplex = msrs->multiplex;
 209         int i;
 210
 211         for (i = 0; i < model->num_counters; ++i) {
 212                 int virt = op_x86_phys_to_virt(i);
 213                 if (counters[i].addr)
 214                         rdmsrl(counters[i].addr, multiplex[virt].saved);
 215         }
 216 }
 217
 218 static void nmi_cpu_restore_mpx_registers(struct op_msrs *msrs)
 219 {
 220         struct op_msr *counters = msrs->counters;
 221         struct op_msr *multiplex = msrs->multiplex;
 222         int i;
 223
 224         for (i = 0; i < model->num_counters; ++i) {
 225                 int virt = op_x86_phys_to_virt(i);
 226                 if (counters[i].addr)
 227                         wrmsrl(counters[i].addr, multiplex[virt].saved);
 228         }
 229 }
 230
 231 static void nmi_cpu_switch(void *dummy)
 232 {
 233         int cpu = smp_processor_id();
 234         int si = per_cpu(switch_index, cpu);
 235         struct op_msrs *msrs = &per_cpu(cpu_msrs, cpu);
 236
 237         nmi_cpu_stop(NULL);
 238         nmi_cpu_save_mpx_registers(msrs);
 239
 240         /* move to next set */
 241         si += model->num_counters;
 242         if ((si >= model->num_virt_counters) || (counter_config[si].count == 0))
 243                 per_cpu(switch_index, cpu) = 0;
 244         else
 245                 per_cpu(switch_index, cpu) = si;
 246
 247         model->switch_ctrl(model, msrs);
 248         nmi_cpu_restore_mpx_registers(msrs);
 249
 250         nmi_cpu_start(NULL);
 251 }
 252
 253
 254 /*
 255  * Quick check to see if multiplexing is necessary.
 256  * The check should be sufficient since counters are used
 257  * in ordre.
 258  */
 259 static int nmi_multiplex_on(void)
 260 {
 261         return counter_config[model->num_counters].count ? 0 : -EINVAL;
 262 }
 263
 264 static int nmi_switch_event(void)
 265 {
 266         if (!has_mux())
 267                 return -ENOSYS;         /* not implemented */
 268         if (nmi_multiplex_on() < 0)
 269                 return -EINVAL;         /* not necessary */
 270
 271         get_online_cpus();
 272         if (ctr_running)
 273                 on_each_cpu(nmi_cpu_switch, NULL, 1);
 274         put_online_cpus();
 275
 276         return 0;
 277 }
 278
 279 static inline void mux_init(struct oprofile_operations *ops)
 280 {
 281         if (has_mux())
 282                 ops->switch_events = nmi_switch_event;
 283 }
 284
 285 static void mux_clone(int cpu)
 286 {
 287         if (!has_mux())
 288                 return;
 289
 290         memcpy(per_cpu(cpu_msrs, cpu).multiplex,
 291                per_cpu(cpu_msrs, 0).multiplex,
 292                sizeof(struct op_msr) * model->num_virt_counters);
 293 }
 294
 295 #else
 296
 297 inline int op_x86_phys_to_virt(int phys) { return phys; }
 298 inline int op_x86_virt_to_phys(int virt) { return virt; }
 299 static inline void nmi_shutdown_mux(void) { }
 300 static inline int nmi_setup_mux(void) { return 1; }
 301 static inline void
 302 nmi_cpu_setup_mux(int cpu, struct op_msrs const * const msrs) { }
 303 static inline void mux_init(struct oprofile_operations *ops) { }
 304 static void mux_clone(int cpu) { }
 305
 306 #endif
 307
 308 static void free_msrs(void)
 309 {
 310         int i;
 311         for_each_possible_cpu(i) {
 312                 kfree(per_cpu(cpu_msrs, i).counters);
 313                 per_cpu(cpu_msrs, i).counters = NULL;
 314                 kfree(per_cpu(cpu_msrs, i).controls);
 315                 per_cpu(cpu_msrs, i).controls = NULL;
 316         }
 317         nmi_shutdown_mux();
 318 }
 319
 320 static int allocate_msrs(void)
 321 {
 322         size_t controls_size = sizeof(struct op_msr) * model->num_controls;
 323         size_t counters_size = sizeof(struct op_msr) * model->num_counters;
 324
 325         int i;
 326         for_each_possible_cpu(i) {
 327                 per_cpu(cpu_msrs, i).counters = kzalloc(counters_size,
 328                                                         GFP_KERNEL);
 329                 if (!per_cpu(cpu_msrs, i).counters)
 330                         goto fail;
 331                 per_cpu(cpu_msrs, i).controls = kzalloc(controls_size,
 332                                                         GFP_KERNEL);
 333                 if (!per_cpu(cpu_msrs, i).controls)
 334                         goto fail;
 335         }
 336
 337         if (!nmi_setup_mux())
 338                 goto fail;
 339
 340         return 1;
 341
 342 fail:
 343         free_msrs();
 344         return 0;
 345 }
 346
 347 static void nmi_cpu_setup(void *dummy)
 348 {
 349         int cpu = smp_processor_id();
 350         struct op_msrs *msrs = &per_cpu(cpu_msrs, cpu);
 351         nmi_cpu_save_registers(msrs);
 352         spin_lock(&oprofilefs_lock);
 353         model->setup_ctrs(model, msrs);
 354         nmi_cpu_setup_mux(cpu, msrs);
 355         spin_unlock(&oprofilefs_lock);
 356         per_cpu(saved_lvtpc, cpu) = apic_read(APIC_LVTPC);
 357         apic_write(APIC_LVTPC, APIC_DM_NMI);
 358 }
 359
 360 static struct notifier_block profile_exceptions_nb = {
 361         .notifier_call = profile_exceptions_notify,
 362         .next = NULL,
 363         .priority = NMI_LOCAL_LOW_PRIOR,
 364 };
 365
 366 static void nmi_cpu_restore_registers(struct op_msrs *msrs)
 367 {
 368         struct op_msr *counters = msrs->counters;
 369         struct op_msr *controls = msrs->controls;
 370         unsigned int i;
 371
 372         for (i = 0; i < model->num_controls; ++i) {
 373                 if (controls[i].addr)
 374                         wrmsrl(controls[i].addr, controls[i].saved);
 375         }
 376
 377         for (i = 0; i < model->num_counters; ++i) {
 378                 if (counters[i].addr)
 379                         wrmsrl(counters[i].addr, counters[i].saved);
 380         }
 381 }
 382
 383 static void nmi_cpu_shutdown(void *dummy)
 384 {
 385         unsigned int v;
 386         int cpu = smp_processor_id();
 387         struct op_msrs *msrs = &per_cpu(cpu_msrs, cpu);
 388
 389         /* restoring APIC_LVTPC can trigger an apic error because the delivery
 390          * mode and vector nr combination can be illegal. That's by design: on
 391          * power on apic lvt contain a zero vector nr which are legal only for
 392          * NMI delivery mode. So inhibit apic err before restoring lvtpc
 393          */
 394         v = apic_read(APIC_LVTERR);
 395         apic_write(APIC_LVTERR, v | APIC_LVT_MASKED);
 396         apic_write(APIC_LVTPC, per_cpu(saved_lvtpc, cpu));
 397         apic_write(APIC_LVTERR, v);
 398         nmi_cpu_restore_registers(msrs);
 399         if (model->cpu_down)
 400                 model->cpu_down();
 401 }
 402
 403 static void nmi_cpu_up(void *dummy)
 404 {
 405         if (nmi_enabled)
 406                 nmi_cpu_setup(dummy);
 407         if (ctr_running)
 408                 nmi_cpu_start(dummy);
 409 }
 410
 411 static void nmi_cpu_down(void *dummy)
 412 {
 413         if (ctr_running)
 414                 nmi_cpu_stop(dummy);
 415         if (nmi_enabled)
 416                 nmi_cpu_shutdown(dummy);
 417 }
 418
 419 static int nmi_create_files(struct super_block *sb, struct dentry *root)
 420 {
 421         unsigned int i;
 422
 423         for (i = 0; i < model->num_virt_counters; ++i) {
 424                 struct dentry *dir;
 425                 char buf[4];
 426
 427                 /* quick little hack to _not_ expose a counter if it is not
 428                  * available for use.  This should protect userspace app.
 429                  * NOTE:  assumes 1:1 mapping here (that counters are organized
 430                  *        sequentially in their struct assignment).
 431                  */
 432                 if (!avail_to_resrv_perfctr_nmi_bit(op_x86_virt_to_phys(i)))
 433                         continue;
 434
 435                 snprintf(buf,  sizeof(buf), "%d", i);
 436                 dir = oprofilefs_mkdir(sb, root, buf);
 437                 oprofilefs_create_ulong(sb, dir, "enabled", &counter_config[i].enabled);
 438                 oprofilefs_create_ulong(sb, dir, "event", &counter_config[i].event);
 439                 oprofilefs_create_ulong(sb, dir, "count", &counter_config[i].count);
 440                 oprofilefs_create_ulong(sb, dir, "unit_mask", &counter_config[i].unit_mask);
 441                 oprofilefs_create_ulong(sb, dir, "kernel", &counter_config[i].kernel);
 442                 oprofilefs_create_ulong(sb, dir, "user", &counter_config[i].user);
 443         }
 444
 445         return 0;
 446 }
 447
 448 static int oprofile_cpu_notifier(struct notifier_block *b, unsigned long action,
 449                                  void *data)
 450 {
 451         int cpu = (unsigned long)data;
 452         switch (action) {
 453         case CPU_DOWN_FAILED:
 454         case CPU_ONLINE:
 455                 smp_call_function_single(cpu, nmi_cpu_up, NULL, 0);
 456                 break;
 457         case CPU_DOWN_PREPARE:
 458                 smp_call_function_single(cpu, nmi_cpu_down, NULL, 1);
 459                 break;
 460         }
 461         return NOTIFY_DONE;
 462 }
 463
 464 static struct notifier_block oprofile_cpu_nb = {
 465         .notifier_call = oprofile_cpu_notifier
 466 };
 467
 468 static int nmi_setup(void)
 469 {
 470         int err = 0;
 471         int cpu;
 472
 473         if (!allocate_msrs())
 474                 return -ENOMEM;
 475
 476         /* We need to serialize save and setup for HT because the subset
 477          * of msrs are distinct for save and setup operations
 478          */
 479
 480         /* Assume saved/restored counters are the same on all CPUs */
 481         err = model->fill_in_addresses(&per_cpu(cpu_msrs, 0));
 482         if (err)
 483                 goto fail;
 484
 485         for_each_possible_cpu(cpu) {
 486                 if (!cpu)
 487                         continue;
 488
 489                 memcpy(per_cpu(cpu_msrs, cpu).counters,
 490                        per_cpu(cpu_msrs, 0).counters,
 491                        sizeof(struct op_msr) * model->num_counters);
 492
 493                 memcpy(per_cpu(cpu_msrs, cpu).controls,
 494                        per_cpu(cpu_msrs, 0).controls,
 495                        sizeof(struct op_msr) * model->num_controls);
 496
 497                 mux_clone(cpu);
 498         }
 499
 500         nmi_enabled = 0;
 501         ctr_running = 0;
 502         barrier();
 503         err = register_die_notifier(&profile_exceptions_nb);
 504         if (err)
 505                 goto fail;
 506
 507         get_online_cpus();
 508         register_cpu_notifier(&oprofile_cpu_nb);
 509         on_each_cpu(nmi_cpu_setup, NULL, 1);
 510         nmi_enabled = 1;
 511         put_online_cpus();
 512
 513         return 0;
 514 fail:
 515         free_msrs();
 516         return err;
 517 }
 518
 519 static void nmi_shutdown(void)
 520 {
 521         struct op_msrs *msrs;
 522
 523         get_online_cpus();
 524         unregister_cpu_notifier(&oprofile_cpu_nb);
 525         on_each_cpu(nmi_cpu_shutdown, NULL, 1);
 526         nmi_enabled = 0;
 527         ctr_running = 0;
 528         put_online_cpus();
 529         barrier();
 530         unregister_die_notifier(&profile_exceptions_nb);
 531         msrs = &get_cpu_var(cpu_msrs);
 532         model->shutdown(msrs);
 533         free_msrs();
 534         put_cpu_var(cpu_msrs);
 535 }
 536
 537 #ifdef CONFIG_PM
 538
 539 static int nmi_suspend(void)
 540 {
 541         /* Only one CPU left, just stop that one */
 542         if (nmi_enabled == 1)
 543                 nmi_cpu_stop(NULL);
 544         return 0;
 545 }
 546
 547 static void nmi_resume(void)
 548 {
 549         if (nmi_enabled == 1)
 550                 nmi_cpu_start(NULL);
 551 }
 552
 553 static struct syscore_ops oprofile_syscore_ops = {
 554         .resume         = nmi_resume,
 555         .suspend        = nmi_suspend,
 556 };
 557
 558 static void __init init_suspend_resume(void)
 559 {
 560         register_syscore_ops(&oprofile_syscore_ops);
 561 }
 562
 563 static void exit_suspend_resume(void)
 564 {
 565         unregister_syscore_ops(&oprofile_syscore_ops);
 566 }
 567
 568 #else
 569
 570 static inline void init_suspend_resume(void) { }
 571 static inline void exit_suspend_resume(void) { }
 572
 573 #endif /* CONFIG_PM */
 574
 575 static int __init p4_init(char **cpu_type)
 576 {
 577         __u8 cpu_model = boot_cpu_data.x86_model;
 578
 579         if (cpu_model > 6 || cpu_model == 5)
 580                 return 0;
 581
 582 #ifndef CONFIG_SMP
 583         *cpu_type = "i386/p4";
 584         model = &op_p4_spec;
 585         return 1;
 586 #else
 587         switch (smp_num_siblings) {
 588         case 1:
 589                 *cpu_type = "i386/p4";
 590                 model = &op_p4_spec;
 591                 return 1;
 592
 593         case 2:
 594                 *cpu_type = "i386/p4-ht";
 595                 model = &op_p4_ht2_spec;
 596                 return 1;
 597         }
 598 #endif
 599
 600         printk(KERN_INFO "oprofile: P4 HyperThreading detected with > 2 threads\n");
 601         printk(KERN_INFO "oprofile: Reverting to timer mode.\n");
 602         return 0;
 603 }
 604
 605 static int force_arch_perfmon;
 606 static int force_cpu_type(const char *str, struct kernel_param *kp)
 607 {
 608         if (!strcmp(str, "arch_perfmon")) {
 609                 force_arch_perfmon = 1;
 610                 printk(KERN_INFO "oprofile: forcing architectural perfmon\n");
 611         }
 612
 613         return 0;
 614 }
 615 module_param_call(cpu_type, force_cpu_type, NULL, NULL, 0);
 616
 617 static int __init ppro_init(char **cpu_type)
 618 {
 619         __u8 cpu_model = boot_cpu_data.x86_model;
 620         struct op_x86_model_spec *spec = &op_ppro_spec; /* default */
 621
 622         if (force_arch_perfmon && cpu_has_arch_perfmon)
 623                 return 0;
 624
 625         /*
 626          * Documentation on identifying Intel processors by CPU family
 627          * and model can be found in the Intel Software Developer's
 628          * Manuals (SDM):
 629          *
 630          *  http://www.intel.com/products/processor/manuals/
 631          *
 632          * As of May 2010 the documentation for this was in the:
 633          * "Intel 64 and IA-32 Architectures Software Developer's
 634          * Manual Volume 3B: System Programming Guide", "Table B-1
 635          * CPUID Signature Values of DisplayFamily_DisplayModel".
 636          */
 637         switch (cpu_model) {
 638         case 0 ... 2:
 639                 *cpu_type = "i386/ppro";
 640                 break;
 641         case 3 ... 5:
 642                 *cpu_type = "i386/pii";
 643                 break;
 644         case 6 ... 8:
 645         case 10 ... 11:
 646                 *cpu_type = "i386/piii";
 647                 break;
 648         case 9:
 649         case 13:
 650                 *cpu_type = "i386/p6_mobile";
 651                 break;
 652         case 14:
 653                 *cpu_type = "i386/core";
 654                 break;
 655         case 0x0f:
 656         case 0x16:
 657         case 0x17:
 658         case 0x1d:
 659                 *cpu_type = "i386/core_2";
 660                 break;
 661         case 0x1a:
 662         case 0x1e:
 663         case 0x2e:
 664                 spec = &op_arch_perfmon_spec;
 665                 *cpu_type = "i386/core_i7";
 666                 break;
 667         case 0x1c:
 668                 *cpu_type = "i386/atom";
 669                 break;
 670         default:
 671                 /* Unknown */
 672                 return 0;
 673         }
 674
 675         model = spec;
 676         return 1;
 677 }
 678
 679 int __init op_nmi_init(struct oprofile_operations *ops)
 680 {
 681         __u8 vendor = boot_cpu_data.x86_vendor;
 682         __u8 family = boot_cpu_data.x86;
 683         char *cpu_type = NULL;
 684         int ret = 0;
 685
 686         if (!cpu_has_apic)
 687                 return -ENODEV;
 688
 689         switch (vendor) {
 690         case X86_VENDOR_AMD:
 691                 /* Needs to be at least an Athlon (or hammer in 32bit mode) */
 692
 693                 switch (family) {
 694                 case 6:
 695                         cpu_type = "i386/athlon";
 696                         break;
 697                 case 0xf:
 698                         /*
 699                          * Actually it could be i386/hammer too, but
 700                          * give user space an consistent name.
 701                          */
 702                         cpu_type = "x86-64/hammer";
 703                         break;
 704                 case 0x10:
 705                         cpu_type = "x86-64/family10";
 706                         break;
 707                 case 0x11:
 708                         cpu_type = "x86-64/family11h";
 709                         break;
 710                 case 0x12:
 711                         cpu_type = "x86-64/family12h";
 712                         break;
 713                 case 0x14:
 714                         cpu_type = "x86-64/family14h";
 715                         break;
 716                 case 0x15:
 717                         cpu_type = "x86-64/family15h";
 718                         break;
 719                 default:
 720                         return -ENODEV;
 721                 }
 722                 model = &op_amd_spec;
 723                 break;
 724
 725         case X86_VENDOR_INTEL:
 726                 switch (family) {
 727                         /* Pentium IV */
 728                 case 0xf:
 729                         p4_init(&cpu_type);
 730                         break;
 731
 732                         /* A P6-class processor */
 733                 case 6:
 734                         ppro_init(&cpu_type);
 735                         break;
 736
 737                 default:
 738                         break;
 739                 }
 740
 741                 if (cpu_type)
 742                         break;
 743
 744                 if (!cpu_has_arch_perfmon)
 745                         return -ENODEV;
 746
 747                 /* use arch perfmon as fallback */
 748                 cpu_type = "i386/arch_perfmon";
 749                 model = &op_arch_perfmon_spec;
 750                 break;
 751
 752         default:
 753                 return -ENODEV;
 754         }
 755
 756         /* default values, can be overwritten by model */
 757         ops->create_files       = nmi_create_files;
 758         ops->setup              = nmi_setup;
 759         ops->shutdown           = nmi_shutdown;
 760         ops->start              = nmi_start;
 761         ops->stop               = nmi_stop;
 762         ops->cpu_type           = cpu_type;
 763
 764         if (model->init)
 765                 ret = model->init(ops);
 766         if (ret)
 767                 return ret;
 768
 769         if (!model->num_virt_counters)
 770                 model->num_virt_counters = model->num_counters;
 771
 772         mux_init(ops);
 773
 774         init_suspend_resume();
 775
 776         printk(KERN_INFO "oprofile: using NMI interrupt.\n");
 777         return 0;
 778 }
 779
 780 void op_nmi_exit(void)
 781 {
 782         exit_suspend_resume();
 783 }