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         counter_config->extra &= (ARCH_PERFMON_EVENTSEL_INV |
  53                                   ARCH_PERFMON_EVENTSEL_EDGE |
  54                                   ARCH_PERFMON_EVENTSEL_CMASK);
  55         val |= counter_config->extra;
  56         event &= model->event_mask ? model->event_mask : 0xFF;
  57         val |= event & 0xFF;
  58         val |= (event & 0x0F00) << 24;
  59
  60         return val;
  61 }
  62
  63
  64 static int profile_exceptions_notify(struct notifier_block *self,
  65                                      unsigned long val, void *data)
  66 {
  67         struct die_args *args = (struct die_args *)data;
  68         int ret = NOTIFY_DONE;
  69
  70         switch (val) {
  71         case DIE_NMI:
  72                 if (ctr_running)
  73                         model->check_ctrs(args->regs, &__get_cpu_var(cpu_msrs));
  74                 else if (!nmi_enabled)
  75                         break;
  76                 else
  77                         model->stop(&__get_cpu_var(cpu_msrs));
  78                 ret = NOTIFY_STOP;
  79                 break;
  80         default:
  81                 break;
  82         }
  83         return ret;
  84 }
  85
  86 static void nmi_cpu_save_registers(struct op_msrs *msrs)
  87 {
  88         struct op_msr *counters = msrs->counters;
  89         struct op_msr *controls = msrs->controls;
  90         unsigned int i;
  91
  92         for (i = 0; i < model->num_counters; ++i) {
  93                 if (counters[i].addr)
  94                         rdmsrl(counters[i].addr, counters[i].saved);
  95         }
  96
  97         for (i = 0; i < model->num_controls; ++i) {
  98                 if (controls[i].addr)
  99                         rdmsrl(controls[i].addr, controls[i].saved);
 100         }
 101 }
 102
 103 static void nmi_cpu_start(void *dummy)
 104 {
 105         struct op_msrs const *msrs = &__get_cpu_var(cpu_msrs);
 106         if (!msrs->controls)
 107                 WARN_ON_ONCE(1);
 108         else
 109                 model->start(msrs);
 110 }
 111
 112 static int nmi_start(void)
 113 {
 114         get_online_cpus();
 115         ctr_running = 1;
 116         /* make ctr_running visible to the nmi handler: */
 117         smp_mb();
 118         on_each_cpu(nmi_cpu_start, NULL, 1);
 119         put_online_cpus();
 120         return 0;
 121 }
 122
 123 static void nmi_cpu_stop(void *dummy)
 124 {
 125         struct op_msrs const *msrs = &__get_cpu_var(cpu_msrs);
 126         if (!msrs->controls)
 127                 WARN_ON_ONCE(1);
 128         else
 129                 model->stop(msrs);
 130 }
 131
 132 static void nmi_stop(void)
 133 {
 134         get_online_cpus();
 135         on_each_cpu(nmi_cpu_stop, NULL, 1);
 136         ctr_running = 0;
 137         put_online_cpus();
 138 }
 139
 140 #ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX
 141
 142 static DEFINE_PER_CPU(int, switch_index);
 143
 144 static inline int has_mux(void)
 145 {
 146         return !!model->switch_ctrl;
 147 }
 148
 149 inline int op_x86_phys_to_virt(int phys)
 150 {
 151         return __this_cpu_read(switch_index) + phys;
 152 }
 153
 154 inline int op_x86_virt_to_phys(int virt)
 155 {
 156         return virt % model->num_counters;
 157 }
 158
 159 static void nmi_shutdown_mux(void)
 160 {
 161         int i;
 162
 163         if (!has_mux())
 164                 return;
 165
 166         for_each_possible_cpu(i) {
 167                 kfree(per_cpu(cpu_msrs, i).multiplex);
 168                 per_cpu(cpu_msrs, i).multiplex = NULL;
 169                 per_cpu(switch_index, i) = 0;
 170         }
 171 }
 172
 173 static int nmi_setup_mux(void)
 174 {
 175         size_t multiplex_size =
 176                 sizeof(struct op_msr) * model->num_virt_counters;
 177         int i;
 178
 179         if (!has_mux())
 180                 return 1;
 181
 182         for_each_possible_cpu(i) {
 183                 per_cpu(cpu_msrs, i).multiplex =
 184                         kzalloc(multiplex_size, GFP_KERNEL);
 185                 if (!per_cpu(cpu_msrs, i).multiplex)
 186                         return 0;
 187         }
 188
 189         return 1;
 190 }
 191
 192 static void nmi_cpu_setup_mux(int cpu, struct op_msrs const * const msrs)
 193 {
 194         int i;
 195         struct op_msr *multiplex = msrs->multiplex;
 196
 197         if (!has_mux())
 198                 return;
 199
 200         for (i = 0; i < model->num_virt_counters; ++i) {
 201                 if (counter_config[i].enabled) {
 202                         multiplex[i].saved = -(u64)counter_config[i].count;
 203                 } else {
 204                         multiplex[i].saved = 0;
 205                 }
 206         }
 207
 208         per_cpu(switch_index, cpu) = 0;
 209 }
 210
 211 static void nmi_cpu_save_mpx_registers(struct op_msrs *msrs)
 212 {
 213         struct op_msr *counters = msrs->counters;
 214         struct op_msr *multiplex = msrs->multiplex;
 215         int i;
 216
 217         for (i = 0; i < model->num_counters; ++i) {
 218                 int virt = op_x86_phys_to_virt(i);
 219                 if (counters[i].addr)
 220                         rdmsrl(counters[i].addr, multiplex[virt].saved);
 221         }
 222 }
 223
 224 static void nmi_cpu_restore_mpx_registers(struct op_msrs *msrs)
 225 {
 226         struct op_msr *counters = msrs->counters;
 227         struct op_msr *multiplex = msrs->multiplex;
 228         int i;
 229
 230         for (i = 0; i < model->num_counters; ++i) {
 231                 int virt = op_x86_phys_to_virt(i);
 232                 if (counters[i].addr)
 233                         wrmsrl(counters[i].addr, multiplex[virt].saved);
 234         }
 235 }
 236
 237 static void nmi_cpu_switch(void *dummy)
 238 {
 239         int cpu = smp_processor_id();
 240         int si = per_cpu(switch_index, cpu);
 241         struct op_msrs *msrs = &per_cpu(cpu_msrs, cpu);
 242
 243         nmi_cpu_stop(NULL);
 244         nmi_cpu_save_mpx_registers(msrs);
 245
 246         /* move to next set */
 247         si += model->num_counters;
 248         if ((si >= model->num_virt_counters) || (counter_config[si].count == 0))
 249                 per_cpu(switch_index, cpu) = 0;
 250         else
 251                 per_cpu(switch_index, cpu) = si;
 252
 253         model->switch_ctrl(model, msrs);
 254         nmi_cpu_restore_mpx_registers(msrs);
 255
 256         nmi_cpu_start(NULL);
 257 }
 258
 259
 260 /*
 261  * Quick check to see if multiplexing is necessary.
 262  * The check should be sufficient since counters are used
 263  * in ordre.
 264  */
 265 static int nmi_multiplex_on(void)
 266 {
 267         return counter_config[model->num_counters].count ? 0 : -EINVAL;
 268 }
 269
 270 static int nmi_switch_event(void)
 271 {
 272         if (!has_mux())
 273                 return -ENOSYS;         /* not implemented */
 274         if (nmi_multiplex_on() < 0)
 275                 return -EINVAL;         /* not necessary */
 276
 277         get_online_cpus();
 278         if (ctr_running)
 279                 on_each_cpu(nmi_cpu_switch, NULL, 1);
 280         put_online_cpus();
 281
 282         return 0;
 283 }
 284
 285 static inline void mux_init(struct oprofile_operations *ops)
 286 {
 287         if (has_mux())
 288                 ops->switch_events = nmi_switch_event;
 289 }
 290
 291 static void mux_clone(int cpu)
 292 {
 293         if (!has_mux())
 294                 return;
 295
 296         memcpy(per_cpu(cpu_msrs, cpu).multiplex,
 297                per_cpu(cpu_msrs, 0).multiplex,
 298                sizeof(struct op_msr) * model->num_virt_counters);
 299 }
 300
 301 #else
 302
 303 inline int op_x86_phys_to_virt(int phys) { return phys; }
 304 inline int op_x86_virt_to_phys(int virt) { return virt; }
 305 static inline void nmi_shutdown_mux(void) { }
 306 static inline int nmi_setup_mux(void) { return 1; }
 307 static inline void
 308 nmi_cpu_setup_mux(int cpu, struct op_msrs const * const msrs) { }
 309 static inline void mux_init(struct oprofile_operations *ops) { }
 310 static void mux_clone(int cpu) { }
 311
 312 #endif
 313
 314 static void free_msrs(void)
 315 {
 316         int i;
 317         for_each_possible_cpu(i) {
 318                 kfree(per_cpu(cpu_msrs, i).counters);
 319                 per_cpu(cpu_msrs, i).counters = NULL;
 320                 kfree(per_cpu(cpu_msrs, i).controls);
 321                 per_cpu(cpu_msrs, i).controls = NULL;
 322         }
 323         nmi_shutdown_mux();
 324 }
 325
 326 static int allocate_msrs(void)
 327 {
 328         size_t controls_size = sizeof(struct op_msr) * model->num_controls;
 329         size_t counters_size = sizeof(struct op_msr) * model->num_counters;
 330
 331         int i;
 332         for_each_possible_cpu(i) {
 333                 per_cpu(cpu_msrs, i).counters = kzalloc(counters_size,
 334                                                         GFP_KERNEL);
 335                 if (!per_cpu(cpu_msrs, i).counters)
 336                         goto fail;
 337                 per_cpu(cpu_msrs, i).controls = kzalloc(controls_size,
 338                                                         GFP_KERNEL);
 339                 if (!per_cpu(cpu_msrs, i).controls)
 340                         goto fail;
 341         }
 342
 343         if (!nmi_setup_mux())
 344                 goto fail;
 345
 346         return 1;
 347
 348 fail:
 349         free_msrs();
 350         return 0;
 351 }
 352
 353 static void nmi_cpu_setup(void *dummy)
 354 {
 355         int cpu = smp_processor_id();
 356         struct op_msrs *msrs = &per_cpu(cpu_msrs, cpu);
 357         nmi_cpu_save_registers(msrs);
 358         spin_lock(&oprofilefs_lock);
 359         model->setup_ctrs(model, msrs);
 360         nmi_cpu_setup_mux(cpu, msrs);
 361         spin_unlock(&oprofilefs_lock);
 362         per_cpu(saved_lvtpc, cpu) = apic_read(APIC_LVTPC);
 363         apic_write(APIC_LVTPC, APIC_DM_NMI);
 364 }
 365
 366 static struct notifier_block profile_exceptions_nb = {
 367         .notifier_call = profile_exceptions_notify,
 368         .next = NULL,
 369         .priority = NMI_LOCAL_LOW_PRIOR,
 370 };
 371
 372 static void nmi_cpu_restore_registers(struct op_msrs *msrs)
 373 {
 374         struct op_msr *counters = msrs->counters;
 375         struct op_msr *controls = msrs->controls;
 376         unsigned int i;
 377
 378         for (i = 0; i < model->num_controls; ++i) {
 379                 if (controls[i].addr)
 380                         wrmsrl(controls[i].addr, controls[i].saved);
 381         }
 382
 383         for (i = 0; i < model->num_counters; ++i) {
 384                 if (counters[i].addr)
 385                         wrmsrl(counters[i].addr, counters[i].saved);
 386         }
 387 }
 388
 389 static void nmi_cpu_shutdown(void *dummy)
 390 {
 391         unsigned int v;
 392         int cpu = smp_processor_id();
 393         struct op_msrs *msrs = &per_cpu(cpu_msrs, cpu);
 394
 395         /* restoring APIC_LVTPC can trigger an apic error because the delivery
 396          * mode and vector nr combination can be illegal. That's by design: on
 397          * power on apic lvt contain a zero vector nr which are legal only for
 398          * NMI delivery mode. So inhibit apic err before restoring lvtpc
 399          */
 400         v = apic_read(APIC_LVTERR);
 401         apic_write(APIC_LVTERR, v | APIC_LVT_MASKED);
 402         apic_write(APIC_LVTPC, per_cpu(saved_lvtpc, cpu));
 403         apic_write(APIC_LVTERR, v);
 404         nmi_cpu_restore_registers(msrs);
 405         if (model->cpu_down)
 406                 model->cpu_down();
 407 }
 408
 409 static void nmi_cpu_up(void *dummy)
 410 {
 411         if (nmi_enabled)
 412                 nmi_cpu_setup(dummy);
 413         if (ctr_running)
 414                 nmi_cpu_start(dummy);
 415 }
 416
 417 static void nmi_cpu_down(void *dummy)
 418 {
 419         if (ctr_running)
 420                 nmi_cpu_stop(dummy);
 421         if (nmi_enabled)
 422                 nmi_cpu_shutdown(dummy);
 423 }
 424
 425 static int nmi_create_files(struct super_block *sb, struct dentry *root)
 426 {
 427         unsigned int i;
 428
 429         for (i = 0; i < model->num_virt_counters; ++i) {
 430                 struct dentry *dir;
 431                 char buf[4];
 432
 433                 /* quick little hack to _not_ expose a counter if it is not
 434                  * available for use.  This should protect userspace app.
 435                  * NOTE:  assumes 1:1 mapping here (that counters are organized
 436                  *        sequentially in their struct assignment).
 437                  */
 438                 if (!avail_to_resrv_perfctr_nmi_bit(op_x86_virt_to_phys(i)))
 439                         continue;
 440
 441                 snprintf(buf,  sizeof(buf), "%d", i);
 442                 dir = oprofilefs_mkdir(sb, root, buf);
 443                 oprofilefs_create_ulong(sb, dir, "enabled", &counter_config[i].enabled);
 444                 oprofilefs_create_ulong(sb, dir, "event", &counter_config[i].event);
 445                 oprofilefs_create_ulong(sb, dir, "count", &counter_config[i].count);
 446                 oprofilefs_create_ulong(sb, dir, "unit_mask", &counter_config[i].unit_mask);
 447                 oprofilefs_create_ulong(sb, dir, "kernel", &counter_config[i].kernel);
 448                 oprofilefs_create_ulong(sb, dir, "user", &counter_config[i].user);
 449                 oprofilefs_create_ulong(sb, dir, "extra", &counter_config[i].extra);
 450         }
 451
 452         return 0;
 453 }
 454
 455 static int oprofile_cpu_notifier(struct notifier_block *b, unsigned long action,
 456                                  void *data)
 457 {
 458         int cpu = (unsigned long)data;
 459         switch (action) {
 460         case CPU_DOWN_FAILED:
 461         case CPU_ONLINE:
 462                 smp_call_function_single(cpu, nmi_cpu_up, NULL, 0);
 463                 break;
 464         case CPU_DOWN_PREPARE:
 465                 smp_call_function_single(cpu, nmi_cpu_down, NULL, 1);
 466                 break;
 467         }
 468         return NOTIFY_DONE;
 469 }
 470
 471 static struct notifier_block oprofile_cpu_nb = {
 472         .notifier_call = oprofile_cpu_notifier
 473 };
 474
 475 static int nmi_setup(void)
 476 {
 477         int err = 0;
 478         int cpu;
 479
 480         if (!allocate_msrs())
 481                 return -ENOMEM;
 482
 483         /* We need to serialize save and setup for HT because the subset
 484          * of msrs are distinct for save and setup operations
 485          */
 486
 487         /* Assume saved/restored counters are the same on all CPUs */
 488         err = model->fill_in_addresses(&per_cpu(cpu_msrs, 0));
 489         if (err)
 490                 goto fail;
 491
 492         for_each_possible_cpu(cpu) {
 493                 if (!cpu)
 494                         continue;
 495
 496                 memcpy(per_cpu(cpu_msrs, cpu).counters,
 497                        per_cpu(cpu_msrs, 0).counters,
 498                        sizeof(struct op_msr) * model->num_counters);
 499
 500                 memcpy(per_cpu(cpu_msrs, cpu).controls,
 501                        per_cpu(cpu_msrs, 0).controls,
 502                        sizeof(struct op_msr) * model->num_controls);
 503
 504                 mux_clone(cpu);
 505         }
 506
 507         nmi_enabled = 0;
 508         ctr_running = 0;
 509         /* make variables visible to the nmi handler: */
 510         smp_mb();
 511         err = register_die_notifier(&profile_exceptions_nb);
 512         if (err)
 513                 goto fail;
 514
 515         get_online_cpus();
 516         register_cpu_notifier(&oprofile_cpu_nb);
 517         nmi_enabled = 1;
 518         /* make nmi_enabled visible to the nmi handler: */
 519         smp_mb();
 520         on_each_cpu(nmi_cpu_setup, NULL, 1);
 521         put_online_cpus();
 522
 523         return 0;
 524 fail:
 525         free_msrs();
 526         return err;
 527 }
 528
 529 static void nmi_shutdown(void)
 530 {
 531         struct op_msrs *msrs;
 532
 533         get_online_cpus();
 534         unregister_cpu_notifier(&oprofile_cpu_nb);
 535         on_each_cpu(nmi_cpu_shutdown, NULL, 1);
 536         nmi_enabled = 0;
 537         ctr_running = 0;
 538         put_online_cpus();
 539         /* make variables visible to the nmi handler: */
 540         smp_mb();
 541         unregister_die_notifier(&profile_exceptions_nb);
 542         msrs = &get_cpu_var(cpu_msrs);
 543         model->shutdown(msrs);
 544         free_msrs();
 545         put_cpu_var(cpu_msrs);
 546 }
 547
 548 #ifdef CONFIG_PM
 549
 550 static int nmi_suspend(void)
 551 {
 552         /* Only one CPU left, just stop that one */
 553         if (nmi_enabled == 1)
 554                 nmi_cpu_stop(NULL);
 555         return 0;
 556 }
 557
 558 static void nmi_resume(void)
 559 {
 560         if (nmi_enabled == 1)
 561                 nmi_cpu_start(NULL);
 562 }
 563
 564 static struct syscore_ops oprofile_syscore_ops = {
 565         .resume         = nmi_resume,
 566         .suspend        = nmi_suspend,
 567 };
 568
 569 static void __init init_suspend_resume(void)
 570 {
 571         register_syscore_ops(&oprofile_syscore_ops);
 572 }
 573
 574 static void exit_suspend_resume(void)
 575 {
 576         unregister_syscore_ops(&oprofile_syscore_ops);
 577 }
 578
 579 #else
 580
 581 static inline void init_suspend_resume(void) { }
 582 static inline void exit_suspend_resume(void) { }
 583
 584 #endif /* CONFIG_PM */
 585
 586 static int __init p4_init(char **cpu_type)
 587 {
 588         __u8 cpu_model = boot_cpu_data.x86_model;
 589
 590         if (cpu_model > 6 || cpu_model == 5)
 591                 return 0;
 592
 593 #ifndef CONFIG_SMP
 594         *cpu_type = "i386/p4";
 595         model = &op_p4_spec;
 596         return 1;
 597 #else
 598         switch (smp_num_siblings) {
 599         case 1:
 600                 *cpu_type = "i386/p4";
 601                 model = &op_p4_spec;
 602                 return 1;
 603
 604         case 2:
 605                 *cpu_type = "i386/p4-ht";
 606                 model = &op_p4_ht2_spec;
 607                 return 1;
 608         }
 609 #endif
 610
 611         printk(KERN_INFO "oprofile: P4 HyperThreading detected with > 2 threads\n");
 612         printk(KERN_INFO "oprofile: Reverting to timer mode.\n");
 613         return 0;
 614 }
 615
 616 static int force_arch_perfmon;
 617 static int force_cpu_type(const char *str, struct kernel_param *kp)
 618 {
 619         if (!strcmp(str, "arch_perfmon")) {
 620                 force_arch_perfmon = 1;
 621                 printk(KERN_INFO "oprofile: forcing architectural perfmon\n");
 622         }
 623
 624         return 0;
 625 }
 626 module_param_call(cpu_type, force_cpu_type, NULL, NULL, 0);
 627
 628 static int __init ppro_init(char **cpu_type)
 629 {
 630         __u8 cpu_model = boot_cpu_data.x86_model;
 631         struct op_x86_model_spec *spec = &op_ppro_spec; /* default */
 632
 633         if (force_arch_perfmon && cpu_has_arch_perfmon)
 634                 return 0;
 635
 636         /*
 637          * Documentation on identifying Intel processors by CPU family
 638          * and model can be found in the Intel Software Developer's
 639          * Manuals (SDM):
 640          *
 641          *  http://www.intel.com/products/processor/manuals/
 642          *
 643          * As of May 2010 the documentation for this was in the:
 644          * "Intel 64 and IA-32 Architectures Software Developer's
 645          * Manual Volume 3B: System Programming Guide", "Table B-1
 646          * CPUID Signature Values of DisplayFamily_DisplayModel".
 647          */
 648         switch (cpu_model) {
 649         case 0 ... 2:
 650                 *cpu_type = "i386/ppro";
 651                 break;
 652         case 3 ... 5:
 653                 *cpu_type = "i386/pii";
 654                 break;
 655         case 6 ... 8:
 656         case 10 ... 11:
 657                 *cpu_type = "i386/piii";
 658                 break;
 659         case 9:
 660         case 13:
 661                 *cpu_type = "i386/p6_mobile";
 662                 break;
 663         case 14:
 664                 *cpu_type = "i386/core";
 665                 break;
 666         case 0x0f:
 667         case 0x16:
 668         case 0x17:
 669         case 0x1d:
 670                 *cpu_type = "i386/core_2";
 671                 break;
 672         case 0x1a:
 673         case 0x1e:
 674         case 0x2e:
 675                 spec = &op_arch_perfmon_spec;
 676                 *cpu_type = "i386/core_i7";
 677                 break;
 678         case 0x1c:
 679                 *cpu_type = "i386/atom";
 680                 break;
 681         default:
 682                 /* Unknown */
 683                 return 0;
 684         }
 685
 686         model = spec;
 687         return 1;
 688 }
 689
 690 int __init op_nmi_init(struct oprofile_operations *ops)
 691 {
 692         __u8 vendor = boot_cpu_data.x86_vendor;
 693         __u8 family = boot_cpu_data.x86;
 694         char *cpu_type = NULL;
 695         int ret = 0;
 696
 697         if (!cpu_has_apic)
 698                 return -ENODEV;
 699
 700         switch (vendor) {
 701         case X86_VENDOR_AMD:
 702                 /* Needs to be at least an Athlon (or hammer in 32bit mode) */
 703
 704                 switch (family) {
 705                 case 6:
 706                         cpu_type = "i386/athlon";
 707                         break;
 708                 case 0xf:
 709                         /*
 710                          * Actually it could be i386/hammer too, but
 711                          * give user space an consistent name.
 712                          */
 713                         cpu_type = "x86-64/hammer";
 714                         break;
 715                 case 0x10:
 716                         cpu_type = "x86-64/family10";
 717                         break;
 718                 case 0x11:
 719                         cpu_type = "x86-64/family11h";
 720                         break;
 721                 case 0x12:
 722                         cpu_type = "x86-64/family12h";
 723                         break;
 724                 case 0x14:
 725                         cpu_type = "x86-64/family14h";
 726                         break;
 727                 case 0x15:
 728                         cpu_type = "x86-64/family15h";
 729                         break;
 730                 default:
 731                         return -ENODEV;
 732                 }
 733                 model = &op_amd_spec;
 734                 break;
 735
 736         case X86_VENDOR_INTEL:
 737                 switch (family) {
 738                         /* Pentium IV */
 739                 case 0xf:
 740                         p4_init(&cpu_type);
 741                         break;
 742
 743                         /* A P6-class processor */
 744                 case 6:
 745                         ppro_init(&cpu_type);
 746                         break;
 747
 748                 default:
 749                         break;
 750                 }
 751
 752                 if (cpu_type)
 753                         break;
 754
 755                 if (!cpu_has_arch_perfmon)
 756                         return -ENODEV;
 757
 758                 /* use arch perfmon as fallback */
 759                 cpu_type = "i386/arch_perfmon";
 760                 model = &op_arch_perfmon_spec;
 761                 break;
 762
 763         default:
 764                 return -ENODEV;
 765         }
 766
 767         /* default values, can be overwritten by model */
 768         ops->create_files       = nmi_create_files;
 769         ops->setup              = nmi_setup;
 770         ops->shutdown           = nmi_shutdown;
 771         ops->start              = nmi_start;
 772         ops->stop               = nmi_stop;
 773         ops->cpu_type           = cpu_type;
 774
 775         if (model->init)
 776                 ret = model->init(ops);
 777         if (ret)
 778                 return ret;
 779
 780         if (!model->num_virt_counters)
 781                 model->num_virt_counters = model->num_counters;
 782
 783         mux_init(ops);
 784
 785         init_suspend_resume();
 786
 787         printk(KERN_INFO "oprofile: using NMI interrupt.\n");
 788         return 0;
 789 }
 790
 791 void op_nmi_exit(void)
 792 {
 793         exit_suspend_resume();
 794 }