arch/x86/oprofile/nmi

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This source file includes following definitions.
op_x86_get_ctrl
profile_exceptions_notify
nmi_cpu_save_registers
nmi_cpu_start
nmi_start
nmi_cpu_stop
nmi_stop
has_mux
op_x86_phys_to_virt
op_x86_virt_to_phys
nmi_shutdown_mux
nmi_setup_mux
nmi_cpu_setup_mux
nmi_cpu_save_mpx_registers
nmi_cpu_restore_mpx_registers
nmi_cpu_switch
nmi_multiplex_on
nmi_switch_event
mux_init
mux_clone
op_x86_phys_to_virt
op_x86_virt_to_phys
nmi_shutdown_mux
nmi_setup_mux
nmi_cpu_setup_mux
mux_init
mux_clone
free_msrs
allocate_msrs
nmi_cpu_setup
nmi_cpu_restore_registers
nmi_cpu_shutdown
nmi_cpu_online
nmi_cpu_down_prep
nmi_create_files
nmi_setup
nmi_shutdown
nmi_suspend
nmi_resume
init_suspend_resume
exit_suspend_resume
init_suspend_resume
exit_suspend_resume
p4_init
set_cpu_type
ppro_init
op_nmi_init
op_nmi_exit
   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 |= (u64)(event & 0x0F00) << 24;
  59 
  60         return val;
  61 }
  62 
  63 
  64 static int profile_exceptions_notify(unsigned int val, struct pt_regs *regs)
  65 {
  66         if (ctr_running)
  67                 model->check_ctrs(regs, this_cpu_ptr(&cpu_msrs));
  68         else if (!nmi_enabled)
  69                 return NMI_DONE;
  70         else
  71                 model->stop(this_cpu_ptr(&cpu_msrs));
  72         return NMI_HANDLED;
  73 }
  74 
  75 static void nmi_cpu_save_registers(struct op_msrs *msrs)
  76 {
  77         struct op_msr *counters = msrs->counters;
  78         struct op_msr *controls = msrs->controls;
  79         unsigned int i;
  80 
  81         for (i = 0; i < model->num_counters; ++i) {
  82                 if (counters[i].addr)
  83                         rdmsrl(counters[i].addr, counters[i].saved);
  84         }
  85 
  86         for (i = 0; i < model->num_controls; ++i) {
  87                 if (controls[i].addr)
  88                         rdmsrl(controls[i].addr, controls[i].saved);
  89         }
  90 }
  91 
  92 static void nmi_cpu_start(void *dummy)
  93 {
  94         struct op_msrs const *msrs = this_cpu_ptr(&cpu_msrs);
  95         if (!msrs->controls)
  96                 WARN_ON_ONCE(1);
  97         else
  98                 model->start(msrs);
  99 }
 100 
 101 static int nmi_start(void)
 102 {
 103         get_online_cpus();
 104         ctr_running = 1;
 105         /* make ctr_running visible to the nmi handler: */
 106         smp_mb();
 107         on_each_cpu(nmi_cpu_start, NULL, 1);
 108         put_online_cpus();
 109         return 0;
 110 }
 111 
 112 static void nmi_cpu_stop(void *dummy)
 113 {
 114         struct op_msrs const *msrs = this_cpu_ptr(&cpu_msrs);
 115         if (!msrs->controls)
 116                 WARN_ON_ONCE(1);
 117         else
 118                 model->stop(msrs);
 119 }
 120 
 121 static void nmi_stop(void)
 122 {
 123         get_online_cpus();
 124         on_each_cpu(nmi_cpu_stop, NULL, 1);
 125         ctr_running = 0;
 126         put_online_cpus();
 127 }
 128 
 129 #ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX
 130 
 131 static DEFINE_PER_CPU(int, switch_index);
 132 
 133 static inline int has_mux(void)
 134 {
 135         return !!model->switch_ctrl;
 136 }
 137 
 138 inline int op_x86_phys_to_virt(int phys)
 139 {
 140         return __this_cpu_read(switch_index) + phys;
 141 }
 142 
 143 inline int op_x86_virt_to_phys(int virt)
 144 {
 145         return virt % model->num_counters;
 146 }
 147 
 148 static void nmi_shutdown_mux(void)
 149 {
 150         int i;
 151 
 152         if (!has_mux())
 153                 return;
 154 
 155         for_each_possible_cpu(i) {
 156                 kfree(per_cpu(cpu_msrs, i).multiplex);
 157                 per_cpu(cpu_msrs, i).multiplex = NULL;
 158                 per_cpu(switch_index, i) = 0;
 159         }
 160 }
 161 
 162 static int nmi_setup_mux(void)
 163 {
 164         size_t multiplex_size =
 165                 sizeof(struct op_msr) * model->num_virt_counters;
 166         int i;
 167 
 168         if (!has_mux())
 169                 return 1;
 170 
 171         for_each_possible_cpu(i) {
 172                 per_cpu(cpu_msrs, i).multiplex =
 173                         kzalloc(multiplex_size, GFP_KERNEL);
 174                 if (!per_cpu(cpu_msrs, i).multiplex)
 175                         return 0;
 176         }
 177 
 178         return 1;
 179 }
 180 
 181 static void nmi_cpu_setup_mux(int cpu, struct op_msrs const * const msrs)
 182 {
 183         int i;
 184         struct op_msr *multiplex = msrs->multiplex;
 185 
 186         if (!has_mux())
 187                 return;
 188 
 189         for (i = 0; i < model->num_virt_counters; ++i) {
 190                 if (counter_config[i].enabled) {
 191                         multiplex[i].saved = -(u64)counter_config[i].count;
 192                 } else {
 193                         multiplex[i].saved = 0;
 194                 }
 195         }
 196 
 197         per_cpu(switch_index, cpu) = 0;
 198 }
 199 
 200 static void nmi_cpu_save_mpx_registers(struct op_msrs *msrs)
 201 {
 202         struct op_msr *counters = msrs->counters;
 203         struct op_msr *multiplex = msrs->multiplex;
 204         int i;
 205 
 206         for (i = 0; i < model->num_counters; ++i) {
 207                 int virt = op_x86_phys_to_virt(i);
 208                 if (counters[i].addr)
 209                         rdmsrl(counters[i].addr, multiplex[virt].saved);
 210         }
 211 }
 212 
 213 static void nmi_cpu_restore_mpx_registers(struct op_msrs *msrs)
 214 {
 215         struct op_msr *counters = msrs->counters;
 216         struct op_msr *multiplex = msrs->multiplex;
 217         int i;
 218 
 219         for (i = 0; i < model->num_counters; ++i) {
 220                 int virt = op_x86_phys_to_virt(i);
 221                 if (counters[i].addr)
 222                         wrmsrl(counters[i].addr, multiplex[virt].saved);
 223         }
 224 }
 225 
 226 static void nmi_cpu_switch(void *dummy)
 227 {
 228         int cpu = smp_processor_id();
 229         int si = per_cpu(switch_index, cpu);
 230         struct op_msrs *msrs = &per_cpu(cpu_msrs, cpu);
 231 
 232         nmi_cpu_stop(NULL);
 233         nmi_cpu_save_mpx_registers(msrs);
 234 
 235         /* move to next set */
 236         si += model->num_counters;
 237         if ((si >= model->num_virt_counters) || (counter_config[si].count == 0))
 238                 per_cpu(switch_index, cpu) = 0;
 239         else
 240                 per_cpu(switch_index, cpu) = si;
 241 
 242         model->switch_ctrl(model, msrs);
 243         nmi_cpu_restore_mpx_registers(msrs);
 244 
 245         nmi_cpu_start(NULL);
 246 }
 247 
 248 
 249 /*
 250  * Quick check to see if multiplexing is necessary.
 251  * The check should be sufficient since counters are used
 252  * in ordre.
 253  */
 254 static int nmi_multiplex_on(void)
 255 {
 256         return counter_config[model->num_counters].count ? 0 : -EINVAL;
 257 }
 258 
 259 static int nmi_switch_event(void)
 260 {
 261         if (!has_mux())
 262                 return -ENOSYS;         /* not implemented */
 263         if (nmi_multiplex_on() < 0)
 264                 return -EINVAL;         /* not necessary */
 265 
 266         get_online_cpus();
 267         if (ctr_running)
 268                 on_each_cpu(nmi_cpu_switch, NULL, 1);
 269         put_online_cpus();
 270 
 271         return 0;
 272 }
 273 
 274 static inline void mux_init(struct oprofile_operations *ops)
 275 {
 276         if (has_mux())
 277                 ops->switch_events = nmi_switch_event;
 278 }
 279 
 280 static void mux_clone(int cpu)
 281 {
 282         if (!has_mux())
 283                 return;
 284 
 285         memcpy(per_cpu(cpu_msrs, cpu).multiplex,
 286                per_cpu(cpu_msrs, 0).multiplex,
 287                sizeof(struct op_msr) * model->num_virt_counters);
 288 }
 289 
 290 #else
 291 
 292 inline int op_x86_phys_to_virt(int phys) { return phys; }
 293 inline int op_x86_virt_to_phys(int virt) { return virt; }
 294 static inline void nmi_shutdown_mux(void) { }
 295 static inline int nmi_setup_mux(void) { return 1; }
 296 static inline void
 297 nmi_cpu_setup_mux(int cpu, struct op_msrs const * const msrs) { }
 298 static inline void mux_init(struct oprofile_operations *ops) { }
 299 static void mux_clone(int cpu) { }
 300 
 301 #endif
 302 
 303 static void free_msrs(void)
 304 {
 305         int i;
 306         for_each_possible_cpu(i) {
 307                 kfree(per_cpu(cpu_msrs, i).counters);
 308                 per_cpu(cpu_msrs, i).counters = NULL;
 309                 kfree(per_cpu(cpu_msrs, i).controls);
 310                 per_cpu(cpu_msrs, i).controls = NULL;
 311         }
 312         nmi_shutdown_mux();
 313 }
 314 
 315 static int allocate_msrs(void)
 316 {
 317         size_t controls_size = sizeof(struct op_msr) * model->num_controls;
 318         size_t counters_size = sizeof(struct op_msr) * model->num_counters;
 319 
 320         int i;
 321         for_each_possible_cpu(i) {
 322                 per_cpu(cpu_msrs, i).counters = kzalloc(counters_size,
 323                                                         GFP_KERNEL);
 324                 if (!per_cpu(cpu_msrs, i).counters)
 325                         goto fail;
 326                 per_cpu(cpu_msrs, i).controls = kzalloc(controls_size,
 327                                                         GFP_KERNEL);
 328                 if (!per_cpu(cpu_msrs, i).controls)
 329                         goto fail;
 330         }
 331 
 332         if (!nmi_setup_mux())
 333                 goto fail;
 334 
 335         return 1;
 336 
 337 fail:
 338         free_msrs();
 339         return 0;
 340 }
 341 
 342 static void nmi_cpu_setup(void)
 343 {
 344         int cpu = smp_processor_id();
 345         struct op_msrs *msrs = &per_cpu(cpu_msrs, cpu);
 346 
 347         nmi_cpu_save_registers(msrs);
 348         raw_spin_lock(&oprofilefs_lock);
 349         model->setup_ctrs(model, msrs);
 350         nmi_cpu_setup_mux(cpu, msrs);
 351         raw_spin_unlock(&oprofilefs_lock);
 352         per_cpu(saved_lvtpc, cpu) = apic_read(APIC_LVTPC);
 353         apic_write(APIC_LVTPC, APIC_DM_NMI);
 354 }
 355 
 356 static void nmi_cpu_restore_registers(struct op_msrs *msrs)
 357 {
 358         struct op_msr *counters = msrs->counters;
 359         struct op_msr *controls = msrs->controls;
 360         unsigned int i;
 361 
 362         for (i = 0; i < model->num_controls; ++i) {
 363                 if (controls[i].addr)
 364                         wrmsrl(controls[i].addr, controls[i].saved);
 365         }
 366 
 367         for (i = 0; i < model->num_counters; ++i) {
 368                 if (counters[i].addr)
 369                         wrmsrl(counters[i].addr, counters[i].saved);
 370         }
 371 }
 372 
 373 static void nmi_cpu_shutdown(void)
 374 {
 375         unsigned int v;
 376         int cpu = smp_processor_id();
 377         struct op_msrs *msrs = &per_cpu(cpu_msrs, cpu);
 378 
 379         /* restoring APIC_LVTPC can trigger an apic error because the delivery
 380          * mode and vector nr combination can be illegal. That's by design: on
 381          * power on apic lvt contain a zero vector nr which are legal only for
 382          * NMI delivery mode. So inhibit apic err before restoring lvtpc
 383          */
 384         v = apic_read(APIC_LVTERR);
 385         apic_write(APIC_LVTERR, v | APIC_LVT_MASKED);
 386         apic_write(APIC_LVTPC, per_cpu(saved_lvtpc, cpu));
 387         apic_write(APIC_LVTERR, v);
 388         nmi_cpu_restore_registers(msrs);
 389 }
 390 
 391 static int nmi_cpu_online(unsigned int cpu)
 392 {
 393         local_irq_disable();
 394         if (nmi_enabled)
 395                 nmi_cpu_setup();
 396         if (ctr_running)
 397                 nmi_cpu_start(NULL);
 398         local_irq_enable();
 399         return 0;
 400 }
 401 
 402 static int nmi_cpu_down_prep(unsigned int cpu)
 403 {
 404         local_irq_disable();
 405         if (ctr_running)
 406                 nmi_cpu_stop(NULL);
 407         if (nmi_enabled)
 408                 nmi_cpu_shutdown();
 409         local_irq_enable();
 410         return 0;
 411 }
 412 
 413 static int nmi_create_files(struct dentry *root)
 414 {
 415         unsigned int i;
 416 
 417         for (i = 0; i < model->num_virt_counters; ++i) {
 418                 struct dentry *dir;
 419                 char buf[4];
 420 
 421                 /* quick little hack to _not_ expose a counter if it is not
 422                  * available for use.  This should protect userspace app.
 423                  * NOTE:  assumes 1:1 mapping here (that counters are organized
 424                  *        sequentially in their struct assignment).
 425                  */
 426                 if (!avail_to_resrv_perfctr_nmi_bit(op_x86_virt_to_phys(i)))
 427                         continue;
 428 
 429                 snprintf(buf,  sizeof(buf), "%d", i);
 430                 dir = oprofilefs_mkdir(root, buf);
 431                 oprofilefs_create_ulong(dir, "enabled", &counter_config[i].enabled);
 432                 oprofilefs_create_ulong(dir, "event", &counter_config[i].event);
 433                 oprofilefs_create_ulong(dir, "count", &counter_config[i].count);
 434                 oprofilefs_create_ulong(dir, "unit_mask", &counter_config[i].unit_mask);
 435                 oprofilefs_create_ulong(dir, "kernel", &counter_config[i].kernel);
 436                 oprofilefs_create_ulong(dir, "user", &counter_config[i].user);
 437                 oprofilefs_create_ulong(dir, "extra", &counter_config[i].extra);
 438         }
 439 
 440         return 0;
 441 }
 442 
 443 static enum cpuhp_state cpuhp_nmi_online;
 444 
 445 static int nmi_setup(void)
 446 {
 447         int err = 0;
 448         int cpu;
 449 
 450         if (!allocate_msrs())
 451                 return -ENOMEM;
 452 
 453         /* We need to serialize save and setup for HT because the subset
 454          * of msrs are distinct for save and setup operations
 455          */
 456 
 457         /* Assume saved/restored counters are the same on all CPUs */
 458         err = model->fill_in_addresses(&per_cpu(cpu_msrs, 0));
 459         if (err)
 460                 goto fail;
 461 
 462         for_each_possible_cpu(cpu) {
 463                 if (!IS_ENABLED(CONFIG_SMP) || !cpu)
 464                         continue;
 465 
 466                 memcpy(per_cpu(cpu_msrs, cpu).counters,
 467                        per_cpu(cpu_msrs, 0).counters,
 468                        sizeof(struct op_msr) * model->num_counters);
 469 
 470                 memcpy(per_cpu(cpu_msrs, cpu).controls,
 471                        per_cpu(cpu_msrs, 0).controls,
 472                        sizeof(struct op_msr) * model->num_controls);
 473 
 474                 mux_clone(cpu);
 475         }
 476 
 477         nmi_enabled = 0;
 478         ctr_running = 0;
 479         /* make variables visible to the nmi handler: */
 480         smp_mb();
 481         err = register_nmi_handler(NMI_LOCAL, profile_exceptions_notify,
 482                                         0, "oprofile");
 483         if (err)
 484                 goto fail;
 485 
 486         nmi_enabled = 1;
 487         /* make nmi_enabled visible to the nmi handler: */
 488         smp_mb();
 489         err = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "x86/oprofile:online",
 490                                 nmi_cpu_online, nmi_cpu_down_prep);
 491         if (err < 0)
 492                 goto fail_nmi;
 493         cpuhp_nmi_online = err;
 494         return 0;
 495 fail_nmi:
 496         unregister_nmi_handler(NMI_LOCAL, "oprofile");
 497 fail:
 498         free_msrs();
 499         return err;
 500 }
 501 
 502 static void nmi_shutdown(void)
 503 {
 504         struct op_msrs *msrs;
 505 
 506         cpuhp_remove_state(cpuhp_nmi_online);
 507         nmi_enabled = 0;
 508         ctr_running = 0;
 509 
 510         /* make variables visible to the nmi handler: */
 511         smp_mb();
 512         unregister_nmi_handler(NMI_LOCAL, "oprofile");
 513         msrs = &get_cpu_var(cpu_msrs);
 514         model->shutdown(msrs);
 515         free_msrs();
 516         put_cpu_var(cpu_msrs);
 517 }
 518 
 519 #ifdef CONFIG_PM
 520 
 521 static int nmi_suspend(void)
 522 {
 523         /* Only one CPU left, just stop that one */
 524         if (nmi_enabled == 1)
 525                 nmi_cpu_stop(NULL);
 526         return 0;
 527 }
 528 
 529 static void nmi_resume(void)
 530 {
 531         if (nmi_enabled == 1)
 532                 nmi_cpu_start(NULL);
 533 }
 534 
 535 static struct syscore_ops oprofile_syscore_ops = {
 536         .resume         = nmi_resume,
 537         .suspend        = nmi_suspend,
 538 };
 539 
 540 static void __init init_suspend_resume(void)
 541 {
 542         register_syscore_ops(&oprofile_syscore_ops);
 543 }
 544 
 545 static void exit_suspend_resume(void)
 546 {
 547         unregister_syscore_ops(&oprofile_syscore_ops);
 548 }
 549 
 550 #else
 551 
 552 static inline void init_suspend_resume(void) { }
 553 static inline void exit_suspend_resume(void) { }
 554 
 555 #endif /* CONFIG_PM */
 556 
 557 static int __init p4_init(char **cpu_type)
 558 {
 559         __u8 cpu_model = boot_cpu_data.x86_model;
 560 
 561         if (cpu_model > 6 || cpu_model == 5)
 562                 return 0;
 563 
 564 #ifndef CONFIG_SMP
 565         *cpu_type = "i386/p4";
 566         model = &op_p4_spec;
 567         return 1;
 568 #else
 569         switch (smp_num_siblings) {
 570         case 1:
 571                 *cpu_type = "i386/p4";
 572                 model = &op_p4_spec;
 573                 return 1;
 574 
 575         case 2:
 576                 *cpu_type = "i386/p4-ht";
 577                 model = &op_p4_ht2_spec;
 578                 return 1;
 579         }
 580 #endif
 581 
 582         printk(KERN_INFO "oprofile: P4 HyperThreading detected with > 2 threads\n");
 583         printk(KERN_INFO "oprofile: Reverting to timer mode.\n");
 584         return 0;
 585 }
 586 
 587 enum __force_cpu_type {
 588         reserved = 0,           /* do not force */
 589         timer,
 590         arch_perfmon,
 591 };
 592 
 593 static int force_cpu_type;
 594 
 595 static int set_cpu_type(const char *str, const struct kernel_param *kp)
 596 {
 597         if (!strcmp(str, "timer")) {
 598                 force_cpu_type = timer;
 599                 printk(KERN_INFO "oprofile: forcing NMI timer mode\n");
 600         } else if (!strcmp(str, "arch_perfmon")) {
 601                 force_cpu_type = arch_perfmon;
 602                 printk(KERN_INFO "oprofile: forcing architectural perfmon\n");
 603         } else {
 604                 force_cpu_type = 0;
 605         }
 606 
 607         return 0;
 608 }
 609 module_param_call(cpu_type, set_cpu_type, NULL, NULL, 0);
 610 
 611 static int __init ppro_init(char **cpu_type)
 612 {
 613         __u8 cpu_model = boot_cpu_data.x86_model;
 614         struct op_x86_model_spec *spec = &op_ppro_spec; /* default */
 615 
 616         if (force_cpu_type == arch_perfmon && boot_cpu_has(X86_FEATURE_ARCH_PERFMON))
 617                 return 0;
 618 
 619         /*
 620          * Documentation on identifying Intel processors by CPU family
 621          * and model can be found in the Intel Software Developer's
 622          * Manuals (SDM):
 623          *
 624          *  http://www.intel.com/products/processor/manuals/
 625          *
 626          * As of May 2010 the documentation for this was in the:
 627          * "Intel 64 and IA-32 Architectures Software Developer's
 628          * Manual Volume 3B: System Programming Guide", "Table B-1
 629          * CPUID Signature Values of DisplayFamily_DisplayModel".
 630          */
 631         switch (cpu_model) {
 632         case 0 ... 2:
 633                 *cpu_type = "i386/ppro";
 634                 break;
 635         case 3 ... 5:
 636                 *cpu_type = "i386/pii";
 637                 break;
 638         case 6 ... 8:
 639         case 10 ... 11:
 640                 *cpu_type = "i386/piii";
 641                 break;
 642         case 9:
 643         case 13:
 644                 *cpu_type = "i386/p6_mobile";
 645                 break;
 646         case 14:
 647                 *cpu_type = "i386/core";
 648                 break;
 649         case 0x0f:
 650         case 0x16:
 651         case 0x17:
 652         case 0x1d:
 653                 *cpu_type = "i386/core_2";
 654                 break;
 655         case 0x1a:
 656         case 0x1e:
 657         case 0x2e:
 658                 spec = &op_arch_perfmon_spec;
 659                 *cpu_type = "i386/core_i7";
 660                 break;
 661         case 0x1c:
 662                 *cpu_type = "i386/atom";
 663                 break;
 664         default:
 665                 /* Unknown */
 666                 return 0;
 667         }
 668 
 669         model = spec;
 670         return 1;
 671 }
 672 
 673 int __init op_nmi_init(struct oprofile_operations *ops)
 674 {
 675         __u8 vendor = boot_cpu_data.x86_vendor;
 676         __u8 family = boot_cpu_data.x86;
 677         char *cpu_type = NULL;
 678         int ret = 0;
 679 
 680         if (!boot_cpu_has(X86_FEATURE_APIC))
 681                 return -ENODEV;
 682 
 683         if (force_cpu_type == timer)
 684                 return -ENODEV;
 685 
 686         switch (vendor) {
 687         case X86_VENDOR_AMD:
 688                 /* Needs to be at least an Athlon (or hammer in 32bit mode) */
 689 
 690                 switch (family) {
 691                 case 6:
 692                         cpu_type = "i386/athlon";
 693                         break;
 694                 case 0xf:
 695                         /*
 696                          * Actually it could be i386/hammer too, but
 697                          * give user space an consistent name.
 698                          */
 699                         cpu_type = "x86-64/hammer";
 700                         break;
 701                 case 0x10:
 702                         cpu_type = "x86-64/family10";
 703                         break;
 704                 case 0x11:
 705                         cpu_type = "x86-64/family11h";
 706                         break;
 707                 case 0x12:
 708                         cpu_type = "x86-64/family12h";
 709                         break;
 710                 case 0x14:
 711                         cpu_type = "x86-64/family14h";
 712                         break;
 713                 case 0x15:
 714                         cpu_type = "x86-64/family15h";
 715                         break;
 716                 default:
 717                         return -ENODEV;
 718                 }
 719                 model = &op_amd_spec;
 720                 break;
 721 
 722         case X86_VENDOR_INTEL:
 723                 switch (family) {
 724                         /* Pentium IV */
 725                 case 0xf:
 726                         p4_init(&cpu_type);
 727                         break;
 728 
 729                         /* A P6-class processor */
 730                 case 6:
 731                         ppro_init(&cpu_type);
 732                         break;
 733 
 734                 default:
 735                         break;
 736                 }
 737 
 738                 if (cpu_type)
 739                         break;
 740 
 741                 if (!boot_cpu_has(X86_FEATURE_ARCH_PERFMON))
 742                         return -ENODEV;
 743 
 744                 /* use arch perfmon as fallback */
 745                 cpu_type = "i386/arch_perfmon";
 746                 model = &op_arch_perfmon_spec;
 747                 break;
 748 
 749         default:
 750                 return -ENODEV;
 751         }
 752 
 753         /* default values, can be overwritten by model */
 754         ops->create_files       = nmi_create_files;
 755         ops->setup              = nmi_setup;
 756         ops->shutdown           = nmi_shutdown;
 757         ops->start              = nmi_start;
 758         ops->stop               = nmi_stop;
 759         ops->cpu_type           = cpu_type;
 760 
 761         if (model->init)
 762                 ret = model->init(ops);
 763         if (ret)
 764                 return ret;
 765 
 766         if (!model->num_virt_counters)
 767                 model->num_virt_counters = model->num_counters;
 768 
 769         mux_init(ops);
 770 
 771         init_suspend_resume();
 772 
 773         printk(KERN_INFO "oprofile: using NMI interrupt.\n");
 774         return 0;
 775 }
 776 
 777 void op_nmi_exit(void)
 778 {
 779         exit_suspend_resume();
 780 }
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root/arch/x86/oprofile/nmi_int.c

DEFINITIONS
