1 /* 2 * Local APIC handling, local APIC timers 3 * 4 * (c) 1999, 2000, 2009 Ingo Molnar <mingo@redhat.com> 5 * 6 * Fixes 7 * Maciej W. Rozycki : Bits for genuine 82489DX APICs; 8 * thanks to Eric Gilmore 9 * and Rolf G. Tews 10 * for testing these extensively. 11 * Maciej W. Rozycki : Various updates and fixes. 12 * Mikael Pettersson : Power Management for UP-APIC. 13 * Pavel Machek and 14 * Mikael Pettersson : PM converted to driver model. 15 */ 16 17 #include <linux/perf_event.h> 18 #include <linux/kernel_stat.h> 19 #include <linux/mc146818rtc.h> 20 #include <linux/acpi_pmtmr.h> 21 #include <linux/clockchips.h> 22 #include <linux/interrupt.h> 23 #include <linux/bootmem.h> 24 #include <linux/ftrace.h> 25 #include <linux/ioport.h> 26 #include <linux/module.h> 27 #include <linux/sysdev.h> 28 #include <linux/delay.h> 29 #include <linux/timex.h> 30 #include <linux/dmar.h> 31 #include <linux/init.h> 32 #include <linux/cpu.h> 33 #include <linux/dmi.h> 34 #include <linux/nmi.h> 35 #include <linux/smp.h> 36 #include <linux/mm.h> 37 38 #include <asm/perf_event.h> 39 #include <asm/x86_init.h> 40 #include <asm/pgalloc.h> 41 #include <asm/atomic.h> 42 #include <asm/mpspec.h> 43 #include <asm/i8253.h> 44 #include <asm/i8259.h> 45 #include <asm/proto.h> 46 #include <asm/apic.h> 47 #include <asm/desc.h> 48 #include <asm/hpet.h> 49 #include <asm/idle.h> 50 #include <asm/mtrr.h> 51 #include <asm/smp.h> 52 #include <asm/mce.h> 53 #include <asm/kvm_para.h> 54 #include <asm/tsc.h> 55 56 unsigned int num_processors; 57 58 unsigned disabled_cpus __cpuinitdata; 59 60 /* Processor that is doing the boot up */ 61 unsigned int boot_cpu_physical_apicid = -1U; 62 63 /* 64 * The highest APIC ID seen during enumeration. 65 */ 66 unsigned int max_physical_apicid; 67 68 /* 69 * Bitmask of physically existing CPUs: 70 */ 71 physid_mask_t phys_cpu_present_map; 72 73 /* 74 * Map cpu index to physical APIC ID 75 */ 76 DEFINE_EARLY_PER_CPU(u16, x86_cpu_to_apicid, BAD_APICID); 77 DEFINE_EARLY_PER_CPU(u16, x86_bios_cpu_apicid, BAD_APICID); 78 EXPORT_EARLY_PER_CPU_SYMBOL(x86_cpu_to_apicid); 79 EXPORT_EARLY_PER_CPU_SYMBOL(x86_bios_cpu_apicid); 80 81 #ifdef CONFIG_X86_32 82 /* 83 * Knob to control our willingness to enable the local APIC. 84 * 85 * +1=force-enable 86 */ 87 static int force_enable_local_apic; 88 /* 89 * APIC command line parameters 90 */ 91 static int __init parse_lapic(char *arg) 92 { 93 force_enable_local_apic = 1; 94 return 0; 95 } 96 early_param("lapic", parse_lapic); 97 /* Local APIC was disabled by the BIOS and enabled by the kernel */ 98 static int enabled_via_apicbase; 99 100 /* 101 * Handle interrupt mode configuration register (IMCR). 102 * This register controls whether the interrupt signals 103 * that reach the BSP come from the master PIC or from the 104 * local APIC. Before entering Symmetric I/O Mode, either 105 * the BIOS or the operating system must switch out of 106 * PIC Mode by changing the IMCR. 107 */ 108 static inline void imcr_pic_to_apic(void) 109 { 110 /* select IMCR register */ 111 outb(0x70, 0x22); 112 /* NMI and 8259 INTR go through APIC */ 113 outb(0x01, 0x23); 114 } 115 116 static inline void imcr_apic_to_pic(void) 117 { 118 /* select IMCR register */ 119 outb(0x70, 0x22); 120 /* NMI and 8259 INTR go directly to BSP */ 121 outb(0x00, 0x23); 122 } 123 #endif 124 125 #ifdef CONFIG_X86_64 126 static int apic_calibrate_pmtmr __initdata; 127 static __init int setup_apicpmtimer(char *s) 128 { 129 apic_calibrate_pmtmr = 1; 130 notsc_setup(NULL); 131 return 0; 132 } 133 __setup("apicpmtimer", setup_apicpmtimer); 134 #endif 135 136 int x2apic_mode; 137 #ifdef CONFIG_X86_X2APIC 138 /* x2apic enabled before OS handover */ 139 static int x2apic_preenabled; 140 static __init int setup_nox2apic(char *str) 141 { 142 if (x2apic_enabled()) { 143 pr_warning("Bios already enabled x2apic, " 144 "can't enforce nox2apic"); 145 return 0; 146 } 147 148 setup_clear_cpu_cap(X86_FEATURE_X2APIC); 149 return 0; 150 } 151 early_param("nox2apic", setup_nox2apic); 152 #endif 153 154 unsigned long mp_lapic_addr; 155 int disable_apic; 156 /* Disable local APIC timer from the kernel commandline or via dmi quirk */ 157 static int disable_apic_timer __cpuinitdata; 158 /* Local APIC timer works in C2 */ 159 int local_apic_timer_c2_ok; 160 EXPORT_SYMBOL_GPL(local_apic_timer_c2_ok); 161 162 int first_system_vector = 0xfe; 163 164 /* 165 * Debug level, exported for io_apic.c 166 */ 167 unsigned int apic_verbosity; 168 169 int pic_mode; 170 171 /* Have we found an MP table */ 172 int smp_found_config; 173 174 static struct resource lapic_resource = { 175 .name = "Local APIC", 176 .flags = IORESOURCE_MEM | IORESOURCE_BUSY, 177 }; 178 179 static unsigned int calibration_result; 180 181 static int lapic_next_event(unsigned long delta, 182 struct clock_event_device *evt); 183 static void lapic_timer_setup(enum clock_event_mode mode, 184 struct clock_event_device *evt); 185 static void lapic_timer_broadcast(const struct cpumask *mask); 186 static void apic_pm_activate(void); 187 188 /* 189 * The local apic timer can be used for any function which is CPU local. 190 */ 191 static struct clock_event_device lapic_clockevent = { 192 .name = "lapic", 193 .features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT 194 | CLOCK_EVT_FEAT_C3STOP | CLOCK_EVT_FEAT_DUMMY, 195 .shift = 32, 196 .set_mode = lapic_timer_setup, 197 .set_next_event = lapic_next_event, 198 .broadcast = lapic_timer_broadcast, 199 .rating = 100, 200 .irq = -1, 201 }; 202 static DEFINE_PER_CPU(struct clock_event_device, lapic_events); 203 204 static unsigned long apic_phys; 205 206 /* 207 * Get the LAPIC version 208 */ 209 static inline int lapic_get_version(void) 210 { 211 return GET_APIC_VERSION(apic_read(APIC_LVR)); 212 } 213 214 /* 215 * Check, if the APIC is integrated or a separate chip 216 */ 217 static inline int lapic_is_integrated(void) 218 { 219 #ifdef CONFIG_X86_64 220 return 1; 221 #else 222 return APIC_INTEGRATED(lapic_get_version()); 223 #endif 224 } 225 226 /* 227 * Check, whether this is a modern or a first generation APIC 228 */ 229 static int modern_apic(void) 230 { 231 /* AMD systems use old APIC versions, so check the CPU */ 232 if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD && 233 boot_cpu_data.x86 >= 0xf) 234 return 1; 235 return lapic_get_version() >= 0x14; 236 } 237 238 /* 239 * right after this call apic become NOOP driven 240 * so apic->write/read doesn't do anything 241 */ 242 void apic_disable(void) 243 { 244 pr_info("APIC: switched to apic NOOP\n"); 245 apic = &apic_noop; 246 } 247 248 void native_apic_wait_icr_idle(void) 249 { 250 while (apic_read(APIC_ICR) & APIC_ICR_BUSY) 251 cpu_relax(); 252 } 253 254 u32 native_safe_apic_wait_icr_idle(void) 255 { 256 u32 send_status; 257 int timeout; 258 259 timeout = 0; 260 do { 261 send_status = apic_read(APIC_ICR) & APIC_ICR_BUSY; 262 if (!send_status) 263 break; 264 udelay(100); 265 } while (timeout++ < 1000); 266 267 return send_status; 268 } 269 270 void native_apic_icr_write(u32 low, u32 id) 271 { 272 apic_write(APIC_ICR2, SET_APIC_DEST_FIELD(id)); 273 apic_write(APIC_ICR, low); 274 } 275 276 u64 native_apic_icr_read(void) 277 { 278 u32 icr1, icr2; 279 280 icr2 = apic_read(APIC_ICR2); 281 icr1 = apic_read(APIC_ICR); 282 283 return icr1 | ((u64)icr2 << 32); 284 } 285 286 /** 287 * enable_NMI_through_LVT0 - enable NMI through local vector table 0 288 */ 289 void __cpuinit enable_NMI_through_LVT0(void) 290 { 291 unsigned int v; 292 293 /* unmask and set to NMI */ 294 v = APIC_DM_NMI; 295 296 /* Level triggered for 82489DX (32bit mode) */ 297 if (!lapic_is_integrated()) 298 v |= APIC_LVT_LEVEL_TRIGGER; 299 300 apic_write(APIC_LVT0, v); 301 } 302 303 #ifdef CONFIG_X86_32 304 /** 305 * get_physical_broadcast - Get number of physical broadcast IDs 306 */ 307 int get_physical_broadcast(void) 308 { 309 return modern_apic() ? 0xff : 0xf; 310 } 311 #endif 312 313 /** 314 * lapic_get_maxlvt - get the maximum number of local vector table entries 315 */ 316 int lapic_get_maxlvt(void) 317 { 318 unsigned int v; 319 320 v = apic_read(APIC_LVR); 321 /* 322 * - we always have APIC integrated on 64bit mode 323 * - 82489DXs do not report # of LVT entries 324 */ 325 return APIC_INTEGRATED(GET_APIC_VERSION(v)) ? GET_APIC_MAXLVT(v) : 2; 326 } 327 328 /* 329 * Local APIC timer 330 */ 331 332 /* Clock divisor */ 333 #define APIC_DIVISOR 16 334 335 /* 336 * This function sets up the local APIC timer, with a timeout of 337 * 'clocks' APIC bus clock. During calibration we actually call 338 * this function twice on the boot CPU, once with a bogus timeout 339 * value, second time for real. The other (noncalibrating) CPUs 340 * call this function only once, with the real, calibrated value. 341 * 342 * We do reads before writes even if unnecessary, to get around the 343 * P5 APIC double write bug. 344 */ 345 static void __setup_APIC_LVTT(unsigned int clocks, int oneshot, int irqen) 346 { 347 unsigned int lvtt_value, tmp_value; 348 349 lvtt_value = LOCAL_TIMER_VECTOR; 350 if (!oneshot) 351 lvtt_value |= APIC_LVT_TIMER_PERIODIC; 352 if (!lapic_is_integrated()) 353 lvtt_value |= SET_APIC_TIMER_BASE(APIC_TIMER_BASE_DIV); 354 355 if (!irqen) 356 lvtt_value |= APIC_LVT_MASKED; 357 358 apic_write(APIC_LVTT, lvtt_value); 359 360 /* 361 * Divide PICLK by 16 362 */ 363 tmp_value = apic_read(APIC_TDCR); 364 apic_write(APIC_TDCR, 365 (tmp_value & ~(APIC_TDR_DIV_1 | APIC_TDR_DIV_TMBASE)) | 366 APIC_TDR_DIV_16); 367 368 if (!oneshot) 369 apic_write(APIC_TMICT, clocks / APIC_DIVISOR); 370 } 371 372 /* 373 * Setup extended LVT, AMD specific (K8, family 10h) 374 * 375 * Vector mappings are hard coded. On K8 only offset 0 (APIC500) and 376 * MCE interrupts are supported. Thus MCE offset must be set to 0. 377 * 378 * If mask=1, the LVT entry does not generate interrupts while mask=0 379 * enables the vector. See also the BKDGs. 380 */ 381 382 #define APIC_EILVT_LVTOFF_MCE 0 383 #define APIC_EILVT_LVTOFF_IBS 1 384 385 static void setup_APIC_eilvt(u8 lvt_off, u8 vector, u8 msg_type, u8 mask) 386 { 387 unsigned long reg = (lvt_off << 4) + APIC_EILVTn(0); 388 unsigned int v = (mask << 16) | (msg_type << 8) | vector; 389 390 apic_write(reg, v); 391 } 392 393 u8 setup_APIC_eilvt_mce(u8 vector, u8 msg_type, u8 mask) 394 { 395 setup_APIC_eilvt(APIC_EILVT_LVTOFF_MCE, vector, msg_type, mask); 396 return APIC_EILVT_LVTOFF_MCE; 397 } 398 399 u8 setup_APIC_eilvt_ibs(u8 vector, u8 msg_type, u8 mask) 400 { 401 setup_APIC_eilvt(APIC_EILVT_LVTOFF_IBS, vector, msg_type, mask); 402 return APIC_EILVT_LVTOFF_IBS; 403 } 404 EXPORT_SYMBOL_GPL(setup_APIC_eilvt_ibs); 405 406 /* 407 * Program the next event, relative to now 408 */ 409 static int lapic_next_event(unsigned long delta, 410 struct clock_event_device *evt) 411 { 412 apic_write(APIC_TMICT, delta); 413 return 0; 414 } 415 416 /* 417 * Setup the lapic timer in periodic or oneshot mode 418 */ 419 static void lapic_timer_setup(enum clock_event_mode mode, 420 struct clock_event_device *evt) 421 { 422 unsigned long flags; 423 unsigned int v; 424 425 /* Lapic used as dummy for broadcast ? */ 426 if (evt->features & CLOCK_EVT_FEAT_DUMMY) 427 return; 428 429 local_irq_save(flags); 430 431 switch (mode) { 432 case CLOCK_EVT_MODE_PERIODIC: 433 case CLOCK_EVT_MODE_ONESHOT: 434 __setup_APIC_LVTT(calibration_result, 435 mode != CLOCK_EVT_MODE_PERIODIC, 1); 436 break; 437 case CLOCK_EVT_MODE_UNUSED: 438 case CLOCK_EVT_MODE_SHUTDOWN: 439 v = apic_read(APIC_LVTT); 440 v |= (APIC_LVT_MASKED | LOCAL_TIMER_VECTOR); 441 apic_write(APIC_LVTT, v); 442 apic_write(APIC_TMICT, 0); 443 break; 444 case CLOCK_EVT_MODE_RESUME: 445 /* Nothing to do here */ 446 break; 447 } 448 449 local_irq_restore(flags); 450 } 451 452 /* 453 * Local APIC timer broadcast function 454 */ 455 static void lapic_timer_broadcast(const struct cpumask *mask) 456 { 457 #ifdef CONFIG_SMP 458 apic->send_IPI_mask(mask, LOCAL_TIMER_VECTOR); 459 #endif 460 } 461 462 /* 463 * Setup the local APIC timer for this CPU. Copy the initilized values 464 * of the boot CPU and register the clock event in the framework. 465 */ 466 static void __cpuinit setup_APIC_timer(void) 467 { 468 struct clock_event_device *levt = &__get_cpu_var(lapic_events); 469 470 if (cpu_has(¤t_cpu_data, X86_FEATURE_ARAT)) { 471 lapic_clockevent.features &= ~CLOCK_EVT_FEAT_C3STOP; 472 /* Make LAPIC timer preferrable over percpu HPET */ 473 lapic_clockevent.rating = 150; 474 } 475 476 memcpy(levt, &lapic_clockevent, sizeof(*levt)); 477 levt->cpumask = cpumask_of(smp_processor_id()); 478 479 clockevents_register_device(levt); 480 } 481 482 /* 483 * In this functions we calibrate APIC bus clocks to the external timer. 484 * 485 * We want to do the calibration only once since we want to have local timer 486 * irqs syncron. CPUs connected by the same APIC bus have the very same bus 487 * frequency. 488 * 489 * This was previously done by reading the PIT/HPET and waiting for a wrap 490 * around to find out, that a tick has elapsed. I have a box, where the PIT 491 * readout is broken, so it never gets out of the wait loop again. This was 492 * also reported by others. 493 * 494 * Monitoring the jiffies value is inaccurate and the clockevents 495 * infrastructure allows us to do a simple substitution of the interrupt 496 * handler. 497 * 498 * The calibration routine also uses the pm_timer when possible, as the PIT 499 * happens to run way too slow (factor 2.3 on my VAIO CoreDuo, which goes 500 * back to normal later in the boot process). 501 */ 502 503 #define LAPIC_CAL_LOOPS (HZ/10) 504 505 static __initdata int lapic_cal_loops = -1; 506 static __initdata long lapic_cal_t1, lapic_cal_t2; 507 static __initdata unsigned long long lapic_cal_tsc1, lapic_cal_tsc2; 508 static __initdata unsigned long lapic_cal_pm1, lapic_cal_pm2; 509 static __initdata unsigned long lapic_cal_j1, lapic_cal_j2; 510 511 /* 512 * Temporary interrupt handler. 513 */ 514 static void __init lapic_cal_handler(struct clock_event_device *dev) 515 { 516 unsigned long long tsc = 0; 517 long tapic = apic_read(APIC_TMCCT); 518 unsigned long pm = acpi_pm_read_early(); 519 520 if (cpu_has_tsc) 521 rdtscll(tsc); 522 523 switch (lapic_cal_loops++) { 524 case 0: 525 lapic_cal_t1 = tapic; 526 lapic_cal_tsc1 = tsc; 527 lapic_cal_pm1 = pm; 528 lapic_cal_j1 = jiffies; 529 break; 530 531 case LAPIC_CAL_LOOPS: 532 lapic_cal_t2 = tapic; 533 lapic_cal_tsc2 = tsc; 534 if (pm < lapic_cal_pm1) 535 pm += ACPI_PM_OVRRUN; 536 lapic_cal_pm2 = pm; 537 lapic_cal_j2 = jiffies; 538 break; 539 } 540 } 541 542 static int __init 543 calibrate_by_pmtimer(long deltapm, long *delta, long *deltatsc) 544 { 545 const long pm_100ms = PMTMR_TICKS_PER_SEC / 10; 546 const long pm_thresh = pm_100ms / 100; 547 unsigned long mult; 548 u64 res; 549 550 #ifndef CONFIG_X86_PM_TIMER 551 return -1; 552 #endif 553 554 apic_printk(APIC_VERBOSE, "... PM-Timer delta = %ld\n", deltapm); 555 556 /* Check, if the PM timer is available */ 557 if (!deltapm) 558 return -1; 559 560 mult = clocksource_hz2mult(PMTMR_TICKS_PER_SEC, 22); 561 562 if (deltapm > (pm_100ms - pm_thresh) && 563 deltapm < (pm_100ms + pm_thresh)) { 564 apic_printk(APIC_VERBOSE, "... PM-Timer result ok\n"); 565 return 0; 566 } 567 568 res = (((u64)deltapm) * mult) >> 22; 569 do_div(res, 1000000); 570 pr_warning("APIC calibration not consistent " 571 "with PM-Timer: %ldms instead of 100ms\n",(long)res); 572 573 /* Correct the lapic counter value */ 574 res = (((u64)(*delta)) * pm_100ms); 575 do_div(res, deltapm); 576 pr_info("APIC delta adjusted to PM-Timer: " 577 "%lu (%ld)\n", (unsigned long)res, *delta); 578 *delta = (long)res; 579 580 /* Correct the tsc counter value */ 581 if (cpu_has_tsc) { 582 res = (((u64)(*deltatsc)) * pm_100ms); 583 do_div(res, deltapm); 584 apic_printk(APIC_VERBOSE, "TSC delta adjusted to " 585 "PM-Timer: %lu (%ld)\n", 586 (unsigned long)res, *deltatsc); 587 *deltatsc = (long)res; 588 } 589 590 return 0; 591 } 592 593 static int __init calibrate_APIC_clock(void) 594 { 595 struct clock_event_device *levt = &__get_cpu_var(lapic_events); 596 void (*real_handler)(struct clock_event_device *dev); 597 unsigned long deltaj; 598 long delta, deltatsc; 599 int pm_referenced = 0; 600 601 local_irq_disable(); 602 603 /* Replace the global interrupt handler */ 604 real_handler = global_clock_event->event_handler; 605 global_clock_event->event_handler = lapic_cal_handler; 606 607 /* 608 * Setup the APIC counter to maximum. There is no way the lapic 609 * can underflow in the 100ms detection time frame 610 */ 611 __setup_APIC_LVTT(0xffffffff, 0, 0); 612 613 /* Let the interrupts run */ 614 local_irq_enable(); 615 616 while (lapic_cal_loops <= LAPIC_CAL_LOOPS) 617 cpu_relax(); 618 619 local_irq_disable(); 620 621 /* Restore the real event handler */ 622 global_clock_event->event_handler = real_handler; 623 624 /* Build delta t1-t2 as apic timer counts down */ 625 delta = lapic_cal_t1 - lapic_cal_t2; 626 apic_printk(APIC_VERBOSE, "... lapic delta = %ld\n", delta); 627 628 deltatsc = (long)(lapic_cal_tsc2 - lapic_cal_tsc1); 629 630 /* we trust the PM based calibration if possible */ 631 pm_referenced = !calibrate_by_pmtimer(lapic_cal_pm2 - lapic_cal_pm1, 632 &delta, &deltatsc); 633 634 /* Calculate the scaled math multiplication factor */ 635 lapic_clockevent.mult = div_sc(delta, TICK_NSEC * LAPIC_CAL_LOOPS, 636 lapic_clockevent.shift); 637 lapic_clockevent.max_delta_ns = 638 clockevent_delta2ns(0x7FFFFF, &lapic_clockevent); 639 lapic_clockevent.min_delta_ns = 640 clockevent_delta2ns(0xF, &lapic_clockevent); 641 642 calibration_result = (delta * APIC_DIVISOR) / LAPIC_CAL_LOOPS; 643 644 apic_printk(APIC_VERBOSE, "..... delta %ld\n", delta); 645 apic_printk(APIC_VERBOSE, "..... mult: %u\n", lapic_clockevent.mult); 646 apic_printk(APIC_VERBOSE, "..... calibration result: %u\n", 647 calibration_result); 648 649 if (cpu_has_tsc) { 650 apic_printk(APIC_VERBOSE, "..... CPU clock speed is " 651 "%ld.%04ld MHz.\n", 652 (deltatsc / LAPIC_CAL_LOOPS) / (1000000 / HZ), 653 (deltatsc / LAPIC_CAL_LOOPS) % (1000000 / HZ)); 654 } 655 656 apic_printk(APIC_VERBOSE, "..... host bus clock speed is " 657 "%u.%04u MHz.\n", 658 calibration_result / (1000000 / HZ), 659 calibration_result % (1000000 / HZ)); 660 661 /* 662 * Do a sanity check on the APIC calibration result 663 */ 664 if (calibration_result < (1000000 / HZ)) { 665 local_irq_enable(); 666 pr_warning("APIC frequency too slow, disabling apic timer\n"); 667 return -1; 668 } 669 670 levt->features &= ~CLOCK_EVT_FEAT_DUMMY; 671 672 /* 673 * PM timer calibration failed or not turned on 674 * so lets try APIC timer based calibration 675 */ 676 if (!pm_referenced) { 677 apic_printk(APIC_VERBOSE, "... verify APIC timer\n"); 678 679 /* 680 * Setup the apic timer manually 681 */ 682 levt->event_handler = lapic_cal_handler; 683 lapic_timer_setup(CLOCK_EVT_MODE_PERIODIC, levt); 684 lapic_cal_loops = -1; 685 686 /* Let the interrupts run */ 687 local_irq_enable(); 688 689 while (lapic_cal_loops <= LAPIC_CAL_LOOPS) 690 cpu_relax(); 691 692 /* Stop the lapic timer */ 693 lapic_timer_setup(CLOCK_EVT_MODE_SHUTDOWN, levt); 694 695 /* Jiffies delta */ 696 deltaj = lapic_cal_j2 - lapic_cal_j1; 697 apic_printk(APIC_VERBOSE, "... jiffies delta = %lu\n", deltaj); 698 699 /* Check, if the jiffies result is consistent */ 700 if (deltaj >= LAPIC_CAL_LOOPS-2 && deltaj <= LAPIC_CAL_LOOPS+2) 701 apic_printk(APIC_VERBOSE, "... jiffies result ok\n"); 702 else 703 levt->features |= CLOCK_EVT_FEAT_DUMMY; 704 } else 705 local_irq_enable(); 706 707 if (levt->features & CLOCK_EVT_FEAT_DUMMY) { 708 pr_warning("APIC timer disabled due to verification failure\n"); 709 return -1; 710 } 711 712 return 0; 713 } 714 715 /* 716 * Setup the boot APIC 717 * 718 * Calibrate and verify the result. 719 */ 720 void __init setup_boot_APIC_clock(void) 721 { 722 /* 723 * The local apic timer can be disabled via the kernel 724 * commandline or from the CPU detection code. Register the lapic 725 * timer as a dummy clock event source on SMP systems, so the 726 * broadcast mechanism is used. On UP systems simply ignore it. 727 */ 728 if (disable_apic_timer) { 729 pr_info("Disabling APIC timer\n"); 730 /* No broadcast on UP ! */ 731 if (num_possible_cpus() > 1) { 732 lapic_clockevent.mult = 1; 733 setup_APIC_timer(); 734 } 735 return; 736 } 737 738 apic_printk(APIC_VERBOSE, "Using local APIC timer interrupts.\n" 739 "calibrating APIC timer ...\n"); 740 741 if (calibrate_APIC_clock()) { 742 /* No broadcast on UP ! */ 743 if (num_possible_cpus() > 1) 744 setup_APIC_timer(); 745 return; 746 } 747 748 /* 749 * If nmi_watchdog is set to IO_APIC, we need the 750 * PIT/HPET going. Otherwise register lapic as a dummy 751 * device. 752 */ 753 if (nmi_watchdog != NMI_IO_APIC) 754 lapic_clockevent.features &= ~CLOCK_EVT_FEAT_DUMMY; 755 else 756 pr_warning("APIC timer registered as dummy," 757 " due to nmi_watchdog=%d!\n", nmi_watchdog); 758 759 /* Setup the lapic or request the broadcast */ 760 setup_APIC_timer(); 761 } 762 763 void __cpuinit setup_secondary_APIC_clock(void) 764 { 765 setup_APIC_timer(); 766 } 767 768 /* 769 * The guts of the apic timer interrupt 770 */ 771 static void local_apic_timer_interrupt(void) 772 { 773 int cpu = smp_processor_id(); 774 struct clock_event_device *evt = &per_cpu(lapic_events, cpu); 775 776 /* 777 * Normally we should not be here till LAPIC has been initialized but 778 * in some cases like kdump, its possible that there is a pending LAPIC 779 * timer interrupt from previous kernel's context and is delivered in 780 * new kernel the moment interrupts are enabled. 781 * 782 * Interrupts are enabled early and LAPIC is setup much later, hence 783 * its possible that when we get here evt->event_handler is NULL. 784 * Check for event_handler being NULL and discard the interrupt as 785 * spurious. 786 */ 787 if (!evt->event_handler) { 788 pr_warning("Spurious LAPIC timer interrupt on cpu %d\n", cpu); 789 /* Switch it off */ 790 lapic_timer_setup(CLOCK_EVT_MODE_SHUTDOWN, evt); 791 return; 792 } 793 794 /* 795 * the NMI deadlock-detector uses this. 796 */ 797 inc_irq_stat(apic_timer_irqs); 798 799 evt->event_handler(evt); 800 } 801 802 /* 803 * Local APIC timer interrupt. This is the most natural way for doing 804 * local interrupts, but local timer interrupts can be emulated by 805 * broadcast interrupts too. [in case the hw doesn't support APIC timers] 806 * 807 * [ if a single-CPU system runs an SMP kernel then we call the local 808 * interrupt as well. Thus we cannot inline the local irq ... ] 809 */ 810 void __irq_entry smp_apic_timer_interrupt(struct pt_regs *regs) 811 { 812 struct pt_regs *old_regs = set_irq_regs(regs); 813 814 /* 815 * NOTE! We'd better ACK the irq immediately, 816 * because timer handling can be slow. 817 */ 818 ack_APIC_irq(); 819 /* 820 * update_process_times() expects us to have done irq_enter(). 821 * Besides, if we don't timer interrupts ignore the global 822 * interrupt lock, which is the WrongThing (tm) to do. 823 */ 824 exit_idle(); 825 irq_enter(); 826 local_apic_timer_interrupt(); 827 irq_exit(); 828 829 set_irq_regs(old_regs); 830 } 831 832 int setup_profiling_timer(unsigned int multiplier) 833 { 834 return -EINVAL; 835 } 836 837 /* 838 * Local APIC start and shutdown 839 */ 840 841 /** 842 * clear_local_APIC - shutdown the local APIC 843 * 844 * This is called, when a CPU is disabled and before rebooting, so the state of 845 * the local APIC has no dangling leftovers. Also used to cleanout any BIOS 846 * leftovers during boot. 847 */ 848 void clear_local_APIC(void) 849 { 850 int maxlvt; 851 u32 v; 852 853 /* APIC hasn't been mapped yet */ 854 if (!x2apic_mode && !apic_phys) 855 return; 856 857 maxlvt = lapic_get_maxlvt(); 858 /* 859 * Masking an LVT entry can trigger a local APIC error 860 * if the vector is zero. Mask LVTERR first to prevent this. 861 */ 862 if (maxlvt >= 3) { 863 v = ERROR_APIC_VECTOR; /* any non-zero vector will do */ 864 apic_write(APIC_LVTERR, v | APIC_LVT_MASKED); 865 } 866 /* 867 * Careful: we have to set masks only first to deassert 868 * any level-triggered sources. 869 */ 870 v = apic_read(APIC_LVTT); 871 apic_write(APIC_LVTT, v | APIC_LVT_MASKED); 872 v = apic_read(APIC_LVT0); 873 apic_write(APIC_LVT0, v | APIC_LVT_MASKED); 874 v = apic_read(APIC_LVT1); 875 apic_write(APIC_LVT1, v | APIC_LVT_MASKED); 876 if (maxlvt >= 4) { 877 v = apic_read(APIC_LVTPC); 878 apic_write(APIC_LVTPC, v | APIC_LVT_MASKED); 879 } 880 881 /* lets not touch this if we didn't frob it */ 882 #ifdef CONFIG_X86_THERMAL_VECTOR 883 if (maxlvt >= 5) { 884 v = apic_read(APIC_LVTTHMR); 885 apic_write(APIC_LVTTHMR, v | APIC_LVT_MASKED); 886 } 887 #endif 888 #ifdef CONFIG_X86_MCE_INTEL 889 if (maxlvt >= 6) { 890 v = apic_read(APIC_LVTCMCI); 891 if (!(v & APIC_LVT_MASKED)) 892 apic_write(APIC_LVTCMCI, v | APIC_LVT_MASKED); 893 } 894 #endif 895 896 /* 897 * Clean APIC state for other OSs: 898 */ 899 apic_write(APIC_LVTT, APIC_LVT_MASKED); 900 apic_write(APIC_LVT0, APIC_LVT_MASKED); 901 apic_write(APIC_LVT1, APIC_LVT_MASKED); 902 if (maxlvt >= 3) 903 apic_write(APIC_LVTERR, APIC_LVT_MASKED); 904 if (maxlvt >= 4) 905 apic_write(APIC_LVTPC, APIC_LVT_MASKED); 906 907 /* Integrated APIC (!82489DX) ? */ 908 if (lapic_is_integrated()) { 909 if (maxlvt > 3) 910 /* Clear ESR due to Pentium errata 3AP and 11AP */ 911 apic_write(APIC_ESR, 0); 912 apic_read(APIC_ESR); 913 } 914 } 915 916 /** 917 * disable_local_APIC - clear and disable the local APIC 918 */ 919 void disable_local_APIC(void) 920 { 921 unsigned int value; 922 923 /* APIC hasn't been mapped yet */ 924 if (!apic_phys) 925 return; 926 927 clear_local_APIC(); 928 929 /* 930 * Disable APIC (implies clearing of registers 931 * for 82489DX!). 932 */ 933 value = apic_read(APIC_SPIV); 934 value &= ~APIC_SPIV_APIC_ENABLED; 935 apic_write(APIC_SPIV, value); 936 937 #ifdef CONFIG_X86_32 938 /* 939 * When LAPIC was disabled by the BIOS and enabled by the kernel, 940 * restore the disabled state. 941 */ 942 if (enabled_via_apicbase) { 943 unsigned int l, h; 944 945 rdmsr(MSR_IA32_APICBASE, l, h); 946 l &= ~MSR_IA32_APICBASE_ENABLE; 947 wrmsr(MSR_IA32_APICBASE, l, h); 948 } 949 #endif 950 } 951 952 /* 953 * If Linux enabled the LAPIC against the BIOS default disable it down before 954 * re-entering the BIOS on shutdown. Otherwise the BIOS may get confused and 955 * not power-off. Additionally clear all LVT entries before disable_local_APIC 956 * for the case where Linux didn't enable the LAPIC. 957 */ 958 void lapic_shutdown(void) 959 { 960 unsigned long flags; 961 962 if (!cpu_has_apic && !apic_from_smp_config()) 963 return; 964 965 local_irq_save(flags); 966 967 #ifdef CONFIG_X86_32 968 if (!enabled_via_apicbase) 969 clear_local_APIC(); 970 else 971 #endif 972 disable_local_APIC(); 973 974 975 local_irq_restore(flags); 976 } 977 978 /* 979 * This is to verify that we're looking at a real local APIC. 980 * Check these against your board if the CPUs aren't getting 981 * started for no apparent reason. 982 */ 983 int __init verify_local_APIC(void) 984 { 985 unsigned int reg0, reg1; 986 987 /* 988 * The version register is read-only in a real APIC. 989 */ 990 reg0 = apic_read(APIC_LVR); 991 apic_printk(APIC_DEBUG, "Getting VERSION: %x\n", reg0); 992 apic_write(APIC_LVR, reg0 ^ APIC_LVR_MASK); 993 reg1 = apic_read(APIC_LVR); 994 apic_printk(APIC_DEBUG, "Getting VERSION: %x\n", reg1); 995 996 /* 997 * The two version reads above should print the same 998 * numbers. If the second one is different, then we 999 * poke at a non-APIC. 1000 */ 1001 if (reg1 != reg0) 1002 return 0; 1003 1004 /* 1005 * Check if the version looks reasonably. 1006 */ 1007 reg1 = GET_APIC_VERSION(reg0); 1008 if (reg1 == 0x00 || reg1 == 0xff) 1009 return 0; 1010 reg1 = lapic_get_maxlvt(); 1011 if (reg1 < 0x02 || reg1 == 0xff) 1012 return 0; 1013 1014 /* 1015 * The ID register is read/write in a real APIC. 1016 */ 1017 reg0 = apic_read(APIC_ID); 1018 apic_printk(APIC_DEBUG, "Getting ID: %x\n", reg0); 1019 apic_write(APIC_ID, reg0 ^ apic->apic_id_mask); 1020 reg1 = apic_read(APIC_ID); 1021 apic_printk(APIC_DEBUG, "Getting ID: %x\n", reg1); 1022 apic_write(APIC_ID, reg0); 1023 if (reg1 != (reg0 ^ apic->apic_id_mask)) 1024 return 0; 1025 1026 /* 1027 * The next two are just to see if we have sane values. 1028 * They're only really relevant if we're in Virtual Wire 1029 * compatibility mode, but most boxes are anymore. 1030 */ 1031 reg0 = apic_read(APIC_LVT0); 1032 apic_printk(APIC_DEBUG, "Getting LVT0: %x\n", reg0); 1033 reg1 = apic_read(APIC_LVT1); 1034 apic_printk(APIC_DEBUG, "Getting LVT1: %x\n", reg1); 1035 1036 return 1; 1037 } 1038 1039 /** 1040 * sync_Arb_IDs - synchronize APIC bus arbitration IDs 1041 */ 1042 void __init sync_Arb_IDs(void) 1043 { 1044 /* 1045 * Unsupported on P4 - see Intel Dev. Manual Vol. 3, Ch. 8.6.1 And not 1046 * needed on AMD. 1047 */ 1048 if (modern_apic() || boot_cpu_data.x86_vendor == X86_VENDOR_AMD) 1049 return; 1050 1051 /* 1052 * Wait for idle. 1053 */ 1054 apic_wait_icr_idle(); 1055 1056 apic_printk(APIC_DEBUG, "Synchronizing Arb IDs.\n"); 1057 apic_write(APIC_ICR, APIC_DEST_ALLINC | 1058 APIC_INT_LEVELTRIG | APIC_DM_INIT); 1059 } 1060 1061 /* 1062 * An initial setup of the virtual wire mode. 1063 */ 1064 void __init init_bsp_APIC(void) 1065 { 1066 unsigned int value; 1067 1068 /* 1069 * Don't do the setup now if we have a SMP BIOS as the 1070 * through-I/O-APIC virtual wire mode might be active. 1071 */ 1072 if (smp_found_config || !cpu_has_apic) 1073 return; 1074 1075 /* 1076 * Do not trust the local APIC being empty at bootup. 1077 */ 1078 clear_local_APIC(); 1079 1080 /* 1081 * Enable APIC. 1082 */ 1083 value = apic_read(APIC_SPIV); 1084 value &= ~APIC_VECTOR_MASK; 1085 value |= APIC_SPIV_APIC_ENABLED; 1086 1087 #ifdef CONFIG_X86_32 1088 /* This bit is reserved on P4/Xeon and should be cleared */ 1089 if ((boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) && 1090 (boot_cpu_data.x86 == 15)) 1091 value &= ~APIC_SPIV_FOCUS_DISABLED; 1092 else 1093 #endif 1094 value |= APIC_SPIV_FOCUS_DISABLED; 1095 value |= SPURIOUS_APIC_VECTOR; 1096 apic_write(APIC_SPIV, value); 1097 1098 /* 1099 * Set up the virtual wire mode. 1100 */ 1101 apic_write(APIC_LVT0, APIC_DM_EXTINT); 1102 value = APIC_DM_NMI; 1103 if (!lapic_is_integrated()) /* 82489DX */ 1104 value |= APIC_LVT_LEVEL_TRIGGER; 1105 apic_write(APIC_LVT1, value); 1106 } 1107 1108 static void __cpuinit lapic_setup_esr(void) 1109 { 1110 unsigned int oldvalue, value, maxlvt; 1111 1112 if (!lapic_is_integrated()) { 1113 pr_info("No ESR for 82489DX.\n"); 1114 return; 1115 } 1116 1117 if (apic->disable_esr) { 1118 /* 1119 * Something untraceable is creating bad interrupts on 1120 * secondary quads ... for the moment, just leave the 1121 * ESR disabled - we can't do anything useful with the 1122 * errors anyway - mbligh 1123 */ 1124 pr_info("Leaving ESR disabled.\n"); 1125 return; 1126 } 1127 1128 maxlvt = lapic_get_maxlvt(); 1129 if (maxlvt > 3) /* Due to the Pentium erratum 3AP. */ 1130 apic_write(APIC_ESR, 0); 1131 oldvalue = apic_read(APIC_ESR); 1132 1133 /* enables sending errors */ 1134 value = ERROR_APIC_VECTOR; 1135 apic_write(APIC_LVTERR, value); 1136 1137 /* 1138 * spec says clear errors after enabling vector. 1139 */ 1140 if (maxlvt > 3) 1141 apic_write(APIC_ESR, 0); 1142 value = apic_read(APIC_ESR); 1143 if (value != oldvalue) 1144 apic_printk(APIC_VERBOSE, "ESR value before enabling " 1145 "vector: 0x%08x after: 0x%08x\n", 1146 oldvalue, value); 1147 } 1148 1149 1150 /** 1151 * setup_local_APIC - setup the local APIC 1152 */ 1153 void __cpuinit setup_local_APIC(void) 1154 { 1155 unsigned int value, queued; 1156 int i, j, acked = 0; 1157 unsigned long long tsc = 0, ntsc; 1158 long long max_loops = cpu_khz; 1159 1160 if (cpu_has_tsc) 1161 rdtscll(tsc); 1162 1163 if (disable_apic) { 1164 arch_disable_smp_support(); 1165 return; 1166 } 1167 1168 #ifdef CONFIG_X86_32 1169 /* Pound the ESR really hard over the head with a big hammer - mbligh */ 1170 if (lapic_is_integrated() && apic->disable_esr) { 1171 apic_write(APIC_ESR, 0); 1172 apic_write(APIC_ESR, 0); 1173 apic_write(APIC_ESR, 0); 1174 apic_write(APIC_ESR, 0); 1175 } 1176 #endif 1177 perf_events_lapic_init(); 1178 1179 preempt_disable(); 1180 1181 /* 1182 * Double-check whether this APIC is really registered. 1183 * This is meaningless in clustered apic mode, so we skip it. 1184 */ 1185 BUG_ON(!apic->apic_id_registered()); 1186 1187 /* 1188 * Intel recommends to set DFR, LDR and TPR before enabling 1189 * an APIC. See e.g. "AP-388 82489DX User's Manual" (Intel 1190 * document number 292116). So here it goes... 1191 */ 1192 apic->init_apic_ldr(); 1193 1194 /* 1195 * Set Task Priority to 'accept all'. We never change this 1196 * later on. 1197 */ 1198 value = apic_read(APIC_TASKPRI); 1199 value &= ~APIC_TPRI_MASK; 1200 apic_write(APIC_TASKPRI, value); 1201 1202 /* 1203 * After a crash, we no longer service the interrupts and a pending 1204 * interrupt from previous kernel might still have ISR bit set. 1205 * 1206 * Most probably by now CPU has serviced that pending interrupt and 1207 * it might not have done the ack_APIC_irq() because it thought, 1208 * interrupt came from i8259 as ExtInt. LAPIC did not get EOI so it 1209 * does not clear the ISR bit and cpu thinks it has already serivced 1210 * the interrupt. Hence a vector might get locked. It was noticed 1211 * for timer irq (vector 0x31). Issue an extra EOI to clear ISR. 1212 */ 1213 do { 1214 queued = 0; 1215 for (i = APIC_ISR_NR - 1; i >= 0; i--) 1216 queued |= apic_read(APIC_IRR + i*0x10); 1217 1218 for (i = APIC_ISR_NR - 1; i >= 0; i--) { 1219 value = apic_read(APIC_ISR + i*0x10); 1220 for (j = 31; j >= 0; j--) { 1221 if (value & (1<<j)) { 1222 ack_APIC_irq(); 1223 acked++; 1224 } 1225 } 1226 } 1227 if (acked > 256) { 1228 printk(KERN_ERR "LAPIC pending interrupts after %d EOI\n", 1229 acked); 1230 break; 1231 } 1232 if (cpu_has_tsc) { 1233 rdtscll(ntsc); 1234 max_loops = (cpu_khz << 10) - (ntsc - tsc); 1235 } else 1236 max_loops--; 1237 } while (queued && max_loops > 0); 1238 WARN_ON(max_loops <= 0); 1239 1240 /* 1241 * Now that we are all set up, enable the APIC 1242 */ 1243 value = apic_read(APIC_SPIV); 1244 value &= ~APIC_VECTOR_MASK; 1245 /* 1246 * Enable APIC 1247 */ 1248 value |= APIC_SPIV_APIC_ENABLED; 1249 1250 #ifdef CONFIG_X86_32 1251 /* 1252 * Some unknown Intel IO/APIC (or APIC) errata is biting us with 1253 * certain networking cards. If high frequency interrupts are 1254 * happening on a particular IOAPIC pin, plus the IOAPIC routing 1255 * entry is masked/unmasked at a high rate as well then sooner or 1256 * later IOAPIC line gets 'stuck', no more interrupts are received 1257 * from the device. If focus CPU is disabled then the hang goes 1258 * away, oh well :-( 1259 * 1260 * [ This bug can be reproduced easily with a level-triggered 1261 * PCI Ne2000 networking cards and PII/PIII processors, dual 1262 * BX chipset. ] 1263 */ 1264 /* 1265 * Actually disabling the focus CPU check just makes the hang less 1266 * frequent as it makes the interrupt distributon model be more 1267 * like LRU than MRU (the short-term load is more even across CPUs). 1268 * See also the comment in end_level_ioapic_irq(). --macro 1269 */ 1270 1271 /* 1272 * - enable focus processor (bit==0) 1273 * - 64bit mode always use processor focus 1274 * so no need to set it 1275 */ 1276 value &= ~APIC_SPIV_FOCUS_DISABLED; 1277 #endif 1278 1279 /* 1280 * Set spurious IRQ vector 1281 */ 1282 value |= SPURIOUS_APIC_VECTOR; 1283 apic_write(APIC_SPIV, value); 1284 1285 /* 1286 * Set up LVT0, LVT1: 1287 * 1288 * set up through-local-APIC on the BP's LINT0. This is not 1289 * strictly necessary in pure symmetric-IO mode, but sometimes 1290 * we delegate interrupts to the 8259A. 1291 */ 1292 /* 1293 * TODO: set up through-local-APIC from through-I/O-APIC? --macro 1294 */ 1295 value = apic_read(APIC_LVT0) & APIC_LVT_MASKED; 1296 if (!smp_processor_id() && (pic_mode || !value)) { 1297 value = APIC_DM_EXTINT; 1298 apic_printk(APIC_VERBOSE, "enabled ExtINT on CPU#%d\n", 1299 smp_processor_id()); 1300 } else { 1301 value = APIC_DM_EXTINT | APIC_LVT_MASKED; 1302 apic_printk(APIC_VERBOSE, "masked ExtINT on CPU#%d\n", 1303 smp_processor_id()); 1304 } 1305 apic_write(APIC_LVT0, value); 1306 1307 /* 1308 * only the BP should see the LINT1 NMI signal, obviously. 1309 */ 1310 if (!smp_processor_id()) 1311 value = APIC_DM_NMI; 1312 else 1313 value = APIC_DM_NMI | APIC_LVT_MASKED; 1314 if (!lapic_is_integrated()) /* 82489DX */ 1315 value |= APIC_LVT_LEVEL_TRIGGER; 1316 apic_write(APIC_LVT1, value); 1317 1318 preempt_enable(); 1319 1320 #ifdef CONFIG_X86_MCE_INTEL 1321 /* Recheck CMCI information after local APIC is up on CPU #0 */ 1322 if (smp_processor_id() == 0) 1323 cmci_recheck(); 1324 #endif 1325 } 1326 1327 void __cpuinit end_local_APIC_setup(void) 1328 { 1329 lapic_setup_esr(); 1330 1331 #ifdef CONFIG_X86_32 1332 { 1333 unsigned int value; 1334 /* Disable the local apic timer */ 1335 value = apic_read(APIC_LVTT); 1336 value |= (APIC_LVT_MASKED | LOCAL_TIMER_VECTOR); 1337 apic_write(APIC_LVTT, value); 1338 } 1339 #endif 1340 1341 setup_apic_nmi_watchdog(NULL); 1342 apic_pm_activate(); 1343 } 1344 1345 #ifdef CONFIG_X86_X2APIC 1346 void check_x2apic(void) 1347 { 1348 if (x2apic_enabled()) { 1349 pr_info("x2apic enabled by BIOS, switching to x2apic ops\n"); 1350 x2apic_preenabled = x2apic_mode = 1; 1351 } 1352 } 1353 1354 void enable_x2apic(void) 1355 { 1356 int msr, msr2; 1357 1358 if (!x2apic_mode) 1359 return; 1360 1361 rdmsr(MSR_IA32_APICBASE, msr, msr2); 1362 if (!(msr & X2APIC_ENABLE)) { 1363 printk_once(KERN_INFO "Enabling x2apic\n"); 1364 wrmsr(MSR_IA32_APICBASE, msr | X2APIC_ENABLE, 0); 1365 } 1366 } 1367 #endif /* CONFIG_X86_X2APIC */ 1368 1369 int __init enable_IR(void) 1370 { 1371 #ifdef CONFIG_INTR_REMAP 1372 if (!intr_remapping_supported()) { 1373 pr_debug("intr-remapping not supported\n"); 1374 return 0; 1375 } 1376 1377 if (!x2apic_preenabled && skip_ioapic_setup) { 1378 pr_info("Skipped enabling intr-remap because of skipping " 1379 "io-apic setup\n"); 1380 return 0; 1381 } 1382 1383 if (enable_intr_remapping(x2apic_supported())) 1384 return 0; 1385 1386 pr_info("Enabled Interrupt-remapping\n"); 1387 1388 return 1; 1389 1390 #endif 1391 return 0; 1392 } 1393 1394 void __init enable_IR_x2apic(void) 1395 { 1396 unsigned long flags; 1397 struct IO_APIC_route_entry **ioapic_entries = NULL; 1398 int ret, x2apic_enabled = 0; 1399 int dmar_table_init_ret; 1400 1401 dmar_table_init_ret = dmar_table_init(); 1402 if (dmar_table_init_ret && !x2apic_supported()) 1403 return; 1404 1405 ioapic_entries = alloc_ioapic_entries(); 1406 if (!ioapic_entries) { 1407 pr_err("Allocate ioapic_entries failed\n"); 1408 goto out; 1409 } 1410 1411 ret = save_IO_APIC_setup(ioapic_entries); 1412 if (ret) { 1413 pr_info("Saving IO-APIC state failed: %d\n", ret); 1414 goto out; 1415 } 1416 1417 local_irq_save(flags); 1418 legacy_pic->mask_all(); 1419 mask_IO_APIC_setup(ioapic_entries); 1420 1421 if (dmar_table_init_ret) 1422 ret = 0; 1423 else 1424 ret = enable_IR(); 1425 1426 if (!ret) { 1427 /* IR is required if there is APIC ID > 255 even when running 1428 * under KVM 1429 */ 1430 if (max_physical_apicid > 255 || !kvm_para_available()) 1431 goto nox2apic; 1432 /* 1433 * without IR all CPUs can be addressed by IOAPIC/MSI 1434 * only in physical mode 1435 */ 1436 x2apic_force_phys(); 1437 } 1438 1439 x2apic_enabled = 1; 1440 1441 if (x2apic_supported() && !x2apic_mode) { 1442 x2apic_mode = 1; 1443 enable_x2apic(); 1444 pr_info("Enabled x2apic\n"); 1445 } 1446 1447 nox2apic: 1448 if (!ret) /* IR enabling failed */ 1449 restore_IO_APIC_setup(ioapic_entries); 1450 legacy_pic->restore_mask(); 1451 local_irq_restore(flags); 1452 1453 out: 1454 if (ioapic_entries) 1455 free_ioapic_entries(ioapic_entries); 1456 1457 if (x2apic_enabled) 1458 return; 1459 1460 if (x2apic_preenabled) 1461 panic("x2apic: enabled by BIOS but kernel init failed."); 1462 else if (cpu_has_x2apic) 1463 pr_info("Not enabling x2apic, Intr-remapping init failed.\n"); 1464 } 1465 1466 #ifdef CONFIG_X86_64 1467 /* 1468 * Detect and enable local APICs on non-SMP boards. 1469 * Original code written by Keir Fraser. 1470 * On AMD64 we trust the BIOS - if it says no APIC it is likely 1471 * not correctly set up (usually the APIC timer won't work etc.) 1472 */ 1473 static int __init detect_init_APIC(void) 1474 { 1475 if (!cpu_has_apic) { 1476 pr_info("No local APIC present\n"); 1477 return -1; 1478 } 1479 1480 mp_lapic_addr = APIC_DEFAULT_PHYS_BASE; 1481 return 0; 1482 } 1483 #else 1484 /* 1485 * Detect and initialize APIC 1486 */ 1487 static int __init detect_init_APIC(void) 1488 { 1489 u32 h, l, features; 1490 1491 /* Disabled by kernel option? */ 1492 if (disable_apic) 1493 return -1; 1494 1495 switch (boot_cpu_data.x86_vendor) { 1496 case X86_VENDOR_AMD: 1497 if ((boot_cpu_data.x86 == 6 && boot_cpu_data.x86_model > 1) || 1498 (boot_cpu_data.x86 >= 15)) 1499 break; 1500 goto no_apic; 1501 case X86_VENDOR_INTEL: 1502 if (boot_cpu_data.x86 == 6 || boot_cpu_data.x86 == 15 || 1503 (boot_cpu_data.x86 == 5 && cpu_has_apic)) 1504 break; 1505 goto no_apic; 1506 default: 1507 goto no_apic; 1508 } 1509 1510 if (!cpu_has_apic) { 1511 /* 1512 * Over-ride BIOS and try to enable the local APIC only if 1513 * "lapic" specified. 1514 */ 1515 if (!force_enable_local_apic) { 1516 pr_info("Local APIC disabled by BIOS -- " 1517 "you can enable it with \"lapic\"\n"); 1518 return -1; 1519 } 1520 /* 1521 * Some BIOSes disable the local APIC in the APIC_BASE 1522 * MSR. This can only be done in software for Intel P6 or later 1523 * and AMD K7 (Model > 1) or later. 1524 */ 1525 rdmsr(MSR_IA32_APICBASE, l, h); 1526 if (!(l & MSR_IA32_APICBASE_ENABLE)) { 1527 pr_info("Local APIC disabled by BIOS -- reenabling.\n"); 1528 l &= ~MSR_IA32_APICBASE_BASE; 1529 l |= MSR_IA32_APICBASE_ENABLE | APIC_DEFAULT_PHYS_BASE; 1530 wrmsr(MSR_IA32_APICBASE, l, h); 1531 enabled_via_apicbase = 1; 1532 } 1533 } 1534 /* 1535 * The APIC feature bit should now be enabled 1536 * in `cpuid' 1537 */ 1538 features = cpuid_edx(1); 1539 if (!(features & (1 << X86_FEATURE_APIC))) { 1540 pr_warning("Could not enable APIC!\n"); 1541 return -1; 1542 } 1543 set_cpu_cap(&boot_cpu_data, X86_FEATURE_APIC); 1544 mp_lapic_addr = APIC_DEFAULT_PHYS_BASE; 1545 1546 /* The BIOS may have set up the APIC at some other address */ 1547 rdmsr(MSR_IA32_APICBASE, l, h); 1548 if (l & MSR_IA32_APICBASE_ENABLE) 1549 mp_lapic_addr = l & MSR_IA32_APICBASE_BASE; 1550 1551 pr_info("Found and enabled local APIC!\n"); 1552 1553 apic_pm_activate(); 1554 1555 return 0; 1556 1557 no_apic: 1558 pr_info("No local APIC present or hardware disabled\n"); 1559 return -1; 1560 } 1561 #endif 1562 1563 #ifdef CONFIG_X86_64 1564 void __init early_init_lapic_mapping(void) 1565 { 1566 /* 1567 * If no local APIC can be found then go out 1568 * : it means there is no mpatable and MADT 1569 */ 1570 if (!smp_found_config) 1571 return; 1572 1573 set_fixmap_nocache(FIX_APIC_BASE, mp_lapic_addr); 1574 apic_printk(APIC_VERBOSE, "mapped APIC to %16lx (%16lx)\n", 1575 APIC_BASE, mp_lapic_addr); 1576 1577 /* 1578 * Fetch the APIC ID of the BSP in case we have a 1579 * default configuration (or the MP table is broken). 1580 */ 1581 boot_cpu_physical_apicid = read_apic_id(); 1582 } 1583 #endif 1584 1585 /** 1586 * init_apic_mappings - initialize APIC mappings 1587 */ 1588 void __init init_apic_mappings(void) 1589 { 1590 unsigned int new_apicid; 1591 1592 if (x2apic_mode) { 1593 boot_cpu_physical_apicid = read_apic_id(); 1594 return; 1595 } 1596 1597 /* If no local APIC can be found return early */ 1598 if (!smp_found_config && detect_init_APIC()) { 1599 /* lets NOP'ify apic operations */ 1600 pr_info("APIC: disable apic facility\n"); 1601 apic_disable(); 1602 } else { 1603 apic_phys = mp_lapic_addr; 1604 1605 /* 1606 * acpi lapic path already maps that address in 1607 * acpi_register_lapic_address() 1608 */ 1609 if (!acpi_lapic) 1610 set_fixmap_nocache(FIX_APIC_BASE, apic_phys); 1611 1612 apic_printk(APIC_VERBOSE, "mapped APIC to %08lx (%08lx)\n", 1613 APIC_BASE, apic_phys); 1614 } 1615 1616 /* 1617 * Fetch the APIC ID of the BSP in case we have a 1618 * default configuration (or the MP table is broken). 1619 */ 1620 new_apicid = read_apic_id(); 1621 if (boot_cpu_physical_apicid != new_apicid) { 1622 boot_cpu_physical_apicid = new_apicid; 1623 /* 1624 * yeah -- we lie about apic_version 1625 * in case if apic was disabled via boot option 1626 * but it's not a problem for SMP compiled kernel 1627 * since smp_sanity_check is prepared for such a case 1628 * and disable smp mode 1629 */ 1630 apic_version[new_apicid] = 1631 GET_APIC_VERSION(apic_read(APIC_LVR)); 1632 } 1633 } 1634 1635 /* 1636 * This initializes the IO-APIC and APIC hardware if this is 1637 * a UP kernel. 1638 */ 1639 int apic_version[MAX_APICS]; 1640 1641 int __init APIC_init_uniprocessor(void) 1642 { 1643 if (disable_apic) { 1644 pr_info("Apic disabled\n"); 1645 return -1; 1646 } 1647 #ifdef CONFIG_X86_64 1648 if (!cpu_has_apic) { 1649 disable_apic = 1; 1650 pr_info("Apic disabled by BIOS\n"); 1651 return -1; 1652 } 1653 #else 1654 if (!smp_found_config && !cpu_has_apic) 1655 return -1; 1656 1657 /* 1658 * Complain if the BIOS pretends there is one. 1659 */ 1660 if (!cpu_has_apic && 1661 APIC_INTEGRATED(apic_version[boot_cpu_physical_apicid])) { 1662 pr_err("BIOS bug, local APIC 0x%x not detected!...\n", 1663 boot_cpu_physical_apicid); 1664 return -1; 1665 } 1666 #endif 1667 1668 #ifndef CONFIG_SMP 1669 enable_IR_x2apic(); 1670 default_setup_apic_routing(); 1671 #endif 1672 1673 verify_local_APIC(); 1674 connect_bsp_APIC(); 1675 1676 #ifdef CONFIG_X86_64 1677 apic_write(APIC_ID, SET_APIC_ID(boot_cpu_physical_apicid)); 1678 #else 1679 /* 1680 * Hack: In case of kdump, after a crash, kernel might be booting 1681 * on a cpu with non-zero lapic id. But boot_cpu_physical_apicid 1682 * might be zero if read from MP tables. Get it from LAPIC. 1683 */ 1684 # ifdef CONFIG_CRASH_DUMP 1685 boot_cpu_physical_apicid = read_apic_id(); 1686 # endif 1687 #endif 1688 physid_set_mask_of_physid(boot_cpu_physical_apicid, &phys_cpu_present_map); 1689 setup_local_APIC(); 1690 1691 #ifdef CONFIG_X86_IO_APIC 1692 /* 1693 * Now enable IO-APICs, actually call clear_IO_APIC 1694 * We need clear_IO_APIC before enabling error vector 1695 */ 1696 if (!skip_ioapic_setup && nr_ioapics) 1697 enable_IO_APIC(); 1698 #endif 1699 1700 end_local_APIC_setup(); 1701 1702 #ifdef CONFIG_X86_IO_APIC 1703 if (smp_found_config && !skip_ioapic_setup && nr_ioapics) 1704 setup_IO_APIC(); 1705 else { 1706 nr_ioapics = 0; 1707 localise_nmi_watchdog(); 1708 } 1709 #else 1710 localise_nmi_watchdog(); 1711 #endif 1712 1713 x86_init.timers.setup_percpu_clockev(); 1714 #ifdef CONFIG_X86_64 1715 check_nmi_watchdog(); 1716 #endif 1717 1718 return 0; 1719 } 1720 1721 /* 1722 * Local APIC interrupts 1723 */ 1724 1725 /* 1726 * This interrupt should _never_ happen with our APIC/SMP architecture 1727 */ 1728 void smp_spurious_interrupt(struct pt_regs *regs) 1729 { 1730 u32 v; 1731 1732 exit_idle(); 1733 irq_enter(); 1734 /* 1735 * Check if this really is a spurious interrupt and ACK it 1736 * if it is a vectored one. Just in case... 1737 * Spurious interrupts should not be ACKed. 1738 */ 1739 v = apic_read(APIC_ISR + ((SPURIOUS_APIC_VECTOR & ~0x1f) >> 1)); 1740 if (v & (1 << (SPURIOUS_APIC_VECTOR & 0x1f))) 1741 ack_APIC_irq(); 1742 1743 inc_irq_stat(irq_spurious_count); 1744 1745 /* see sw-dev-man vol 3, chapter 7.4.13.5 */ 1746 pr_info("spurious APIC interrupt on CPU#%d, " 1747 "should never happen.\n", smp_processor_id()); 1748 irq_exit(); 1749 } 1750 1751 /* 1752 * This interrupt should never happen with our APIC/SMP architecture 1753 */ 1754 void smp_error_interrupt(struct pt_regs *regs) 1755 { 1756 u32 v, v1; 1757 1758 exit_idle(); 1759 irq_enter(); 1760 /* First tickle the hardware, only then report what went on. -- REW */ 1761 v = apic_read(APIC_ESR); 1762 apic_write(APIC_ESR, 0); 1763 v1 = apic_read(APIC_ESR); 1764 ack_APIC_irq(); 1765 atomic_inc(&irq_err_count); 1766 1767 /* 1768 * Here is what the APIC error bits mean: 1769 * 0: Send CS error 1770 * 1: Receive CS error 1771 * 2: Send accept error 1772 * 3: Receive accept error 1773 * 4: Reserved 1774 * 5: Send illegal vector 1775 * 6: Received illegal vector 1776 * 7: Illegal register address 1777 */ 1778 pr_debug("APIC error on CPU%d: %02x(%02x)\n", 1779 smp_processor_id(), v , v1); 1780 irq_exit(); 1781 } 1782 1783 /** 1784 * connect_bsp_APIC - attach the APIC to the interrupt system 1785 */ 1786 void __init connect_bsp_APIC(void) 1787 { 1788 #ifdef CONFIG_X86_32 1789 if (pic_mode) { 1790 /* 1791 * Do not trust the local APIC being empty at bootup. 1792 */ 1793 clear_local_APIC(); 1794 /* 1795 * PIC mode, enable APIC mode in the IMCR, i.e. connect BSP's 1796 * local APIC to INT and NMI lines. 1797 */ 1798 apic_printk(APIC_VERBOSE, "leaving PIC mode, " 1799 "enabling APIC mode.\n"); 1800 imcr_pic_to_apic(); 1801 } 1802 #endif 1803 if (apic->enable_apic_mode) 1804 apic->enable_apic_mode(); 1805 } 1806 1807 /** 1808 * disconnect_bsp_APIC - detach the APIC from the interrupt system 1809 * @virt_wire_setup: indicates, whether virtual wire mode is selected 1810 * 1811 * Virtual wire mode is necessary to deliver legacy interrupts even when the 1812 * APIC is disabled. 1813 */ 1814 void disconnect_bsp_APIC(int virt_wire_setup) 1815 { 1816 unsigned int value; 1817 1818 #ifdef CONFIG_X86_32 1819 if (pic_mode) { 1820 /* 1821 * Put the board back into PIC mode (has an effect only on 1822 * certain older boards). Note that APIC interrupts, including 1823 * IPIs, won't work beyond this point! The only exception are 1824 * INIT IPIs. 1825 */ 1826 apic_printk(APIC_VERBOSE, "disabling APIC mode, " 1827 "entering PIC mode.\n"); 1828 imcr_apic_to_pic(); 1829 return; 1830 } 1831 #endif 1832 1833 /* Go back to Virtual Wire compatibility mode */ 1834 1835 /* For the spurious interrupt use vector F, and enable it */ 1836 value = apic_read(APIC_SPIV); 1837 value &= ~APIC_VECTOR_MASK; 1838 value |= APIC_SPIV_APIC_ENABLED; 1839 value |= 0xf; 1840 apic_write(APIC_SPIV, value); 1841 1842 if (!virt_wire_setup) { 1843 /* 1844 * For LVT0 make it edge triggered, active high, 1845 * external and enabled 1846 */ 1847 value = apic_read(APIC_LVT0); 1848 value &= ~(APIC_MODE_MASK | APIC_SEND_PENDING | 1849 APIC_INPUT_POLARITY | APIC_LVT_REMOTE_IRR | 1850 APIC_LVT_LEVEL_TRIGGER | APIC_LVT_MASKED); 1851 value |= APIC_LVT_REMOTE_IRR | APIC_SEND_PENDING; 1852 value = SET_APIC_DELIVERY_MODE(value, APIC_MODE_EXTINT); 1853 apic_write(APIC_LVT0, value); 1854 } else { 1855 /* Disable LVT0 */ 1856 apic_write(APIC_LVT0, APIC_LVT_MASKED); 1857 } 1858 1859 /* 1860 * For LVT1 make it edge triggered, active high, 1861 * nmi and enabled 1862 */ 1863 value = apic_read(APIC_LVT1); 1864 value &= ~(APIC_MODE_MASK | APIC_SEND_PENDING | 1865 APIC_INPUT_POLARITY | APIC_LVT_REMOTE_IRR | 1866 APIC_LVT_LEVEL_TRIGGER | APIC_LVT_MASKED); 1867 value |= APIC_LVT_REMOTE_IRR | APIC_SEND_PENDING; 1868 value = SET_APIC_DELIVERY_MODE(value, APIC_MODE_NMI); 1869 apic_write(APIC_LVT1, value); 1870 } 1871 1872 void __cpuinit generic_processor_info(int apicid, int version) 1873 { 1874 int cpu; 1875 1876 /* 1877 * Validate version 1878 */ 1879 if (version == 0x0) { 1880 pr_warning("BIOS bug, APIC version is 0 for CPU#%d! " 1881 "fixing up to 0x10. (tell your hw vendor)\n", 1882 version); 1883 version = 0x10; 1884 } 1885 apic_version[apicid] = version; 1886 1887 if (num_processors >= nr_cpu_ids) { 1888 int max = nr_cpu_ids; 1889 int thiscpu = max + disabled_cpus; 1890 1891 pr_warning( 1892 "ACPI: NR_CPUS/possible_cpus limit of %i reached." 1893 " Processor %d/0x%x ignored.\n", max, thiscpu, apicid); 1894 1895 disabled_cpus++; 1896 return; 1897 } 1898 1899 num_processors++; 1900 cpu = cpumask_next_zero(-1, cpu_present_mask); 1901 1902 if (version != apic_version[boot_cpu_physical_apicid]) 1903 WARN_ONCE(1, 1904 "ACPI: apic version mismatch, bootcpu: %x cpu %d: %x\n", 1905 apic_version[boot_cpu_physical_apicid], cpu, version); 1906 1907 physid_set(apicid, phys_cpu_present_map); 1908 if (apicid == boot_cpu_physical_apicid) { 1909 /* 1910 * x86_bios_cpu_apicid is required to have processors listed 1911 * in same order as logical cpu numbers. Hence the first 1912 * entry is BSP, and so on. 1913 */ 1914 cpu = 0; 1915 } 1916 if (apicid > max_physical_apicid) 1917 max_physical_apicid = apicid; 1918 1919 #if defined(CONFIG_SMP) || defined(CONFIG_X86_64) 1920 early_per_cpu(x86_cpu_to_apicid, cpu) = apicid; 1921 early_per_cpu(x86_bios_cpu_apicid, cpu) = apicid; 1922 #endif 1923 1924 set_cpu_possible(cpu, true); 1925 set_cpu_present(cpu, true); 1926 } 1927 1928 int hard_smp_processor_id(void) 1929 { 1930 return read_apic_id(); 1931 } 1932 1933 void default_init_apic_ldr(void) 1934 { 1935 unsigned long val; 1936 1937 apic_write(APIC_DFR, APIC_DFR_VALUE); 1938 val = apic_read(APIC_LDR) & ~APIC_LDR_MASK; 1939 val |= SET_APIC_LOGICAL_ID(1UL << smp_processor_id()); 1940 apic_write(APIC_LDR, val); 1941 } 1942 1943 #ifdef CONFIG_X86_32 1944 int default_apicid_to_node(int logical_apicid) 1945 { 1946 #ifdef CONFIG_SMP 1947 return apicid_2_node[hard_smp_processor_id()]; 1948 #else 1949 return 0; 1950 #endif 1951 } 1952 #endif 1953 1954 /* 1955 * Power management 1956 */ 1957 #ifdef CONFIG_PM 1958 1959 static struct { 1960 /* 1961 * 'active' is true if the local APIC was enabled by us and 1962 * not the BIOS; this signifies that we are also responsible 1963 * for disabling it before entering apm/acpi suspend 1964 */ 1965 int active; 1966 /* r/w apic fields */ 1967 unsigned int apic_id; 1968 unsigned int apic_taskpri; 1969 unsigned int apic_ldr; 1970 unsigned int apic_dfr; 1971 unsigned int apic_spiv; 1972 unsigned int apic_lvtt; 1973 unsigned int apic_lvtpc; 1974 unsigned int apic_lvt0; 1975 unsigned int apic_lvt1; 1976 unsigned int apic_lvterr; 1977 unsigned int apic_tmict; 1978 unsigned int apic_tdcr; 1979 unsigned int apic_thmr; 1980 } apic_pm_state; 1981 1982 static int lapic_suspend(struct sys_device *dev, pm_message_t state) 1983 { 1984 unsigned long flags; 1985 int maxlvt; 1986 1987 if (!apic_pm_state.active) 1988 return 0; 1989 1990 maxlvt = lapic_get_maxlvt(); 1991 1992 apic_pm_state.apic_id = apic_read(APIC_ID); 1993 apic_pm_state.apic_taskpri = apic_read(APIC_TASKPRI); 1994 apic_pm_state.apic_ldr = apic_read(APIC_LDR); 1995 apic_pm_state.apic_dfr = apic_read(APIC_DFR); 1996 apic_pm_state.apic_spiv = apic_read(APIC_SPIV); 1997 apic_pm_state.apic_lvtt = apic_read(APIC_LVTT); 1998 if (maxlvt >= 4) 1999 apic_pm_state.apic_lvtpc = apic_read(APIC_LVTPC); 2000 apic_pm_state.apic_lvt0 = apic_read(APIC_LVT0); 2001 apic_pm_state.apic_lvt1 = apic_read(APIC_LVT1); 2002 apic_pm_state.apic_lvterr = apic_read(APIC_LVTERR); 2003 apic_pm_state.apic_tmict = apic_read(APIC_TMICT); 2004 apic_pm_state.apic_tdcr = apic_read(APIC_TDCR); 2005 #ifdef CONFIG_X86_THERMAL_VECTOR 2006 if (maxlvt >= 5) 2007 apic_pm_state.apic_thmr = apic_read(APIC_LVTTHMR); 2008 #endif 2009 2010 local_irq_save(flags); 2011 disable_local_APIC(); 2012 2013 if (intr_remapping_enabled) 2014 disable_intr_remapping(); 2015 2016 local_irq_restore(flags); 2017 return 0; 2018 } 2019 2020 static int lapic_resume(struct sys_device *dev) 2021 { 2022 unsigned int l, h; 2023 unsigned long flags; 2024 int maxlvt; 2025 int ret = 0; 2026 struct IO_APIC_route_entry **ioapic_entries = NULL; 2027 2028 if (!apic_pm_state.active) 2029 return 0; 2030 2031 local_irq_save(flags); 2032 if (intr_remapping_enabled) { 2033 ioapic_entries = alloc_ioapic_entries(); 2034 if (!ioapic_entries) { 2035 WARN(1, "Alloc ioapic_entries in lapic resume failed."); 2036 ret = -ENOMEM; 2037 goto restore; 2038 } 2039 2040 ret = save_IO_APIC_setup(ioapic_entries); 2041 if (ret) { 2042 WARN(1, "Saving IO-APIC state failed: %d\n", ret); 2043 free_ioapic_entries(ioapic_entries); 2044 goto restore; 2045 } 2046 2047 mask_IO_APIC_setup(ioapic_entries); 2048 legacy_pic->mask_all(); 2049 } 2050 2051 if (x2apic_mode) 2052 enable_x2apic(); 2053 else { 2054 /* 2055 * Make sure the APICBASE points to the right address 2056 * 2057 * FIXME! This will be wrong if we ever support suspend on 2058 * SMP! We'll need to do this as part of the CPU restore! 2059 */ 2060 rdmsr(MSR_IA32_APICBASE, l, h); 2061 l &= ~MSR_IA32_APICBASE_BASE; 2062 l |= MSR_IA32_APICBASE_ENABLE | mp_lapic_addr; 2063 wrmsr(MSR_IA32_APICBASE, l, h); 2064 } 2065 2066 maxlvt = lapic_get_maxlvt(); 2067 apic_write(APIC_LVTERR, ERROR_APIC_VECTOR | APIC_LVT_MASKED); 2068 apic_write(APIC_ID, apic_pm_state.apic_id); 2069 apic_write(APIC_DFR, apic_pm_state.apic_dfr); 2070 apic_write(APIC_LDR, apic_pm_state.apic_ldr); 2071 apic_write(APIC_TASKPRI, apic_pm_state.apic_taskpri); 2072 apic_write(APIC_SPIV, apic_pm_state.apic_spiv); 2073 apic_write(APIC_LVT0, apic_pm_state.apic_lvt0); 2074 apic_write(APIC_LVT1, apic_pm_state.apic_lvt1); 2075 #if defined(CONFIG_X86_MCE_P4THERMAL) || defined(CONFIG_X86_MCE_INTEL) 2076 if (maxlvt >= 5) 2077 apic_write(APIC_LVTTHMR, apic_pm_state.apic_thmr); 2078 #endif 2079 if (maxlvt >= 4) 2080 apic_write(APIC_LVTPC, apic_pm_state.apic_lvtpc); 2081 apic_write(APIC_LVTT, apic_pm_state.apic_lvtt); 2082 apic_write(APIC_TDCR, apic_pm_state.apic_tdcr); 2083 apic_write(APIC_TMICT, apic_pm_state.apic_tmict); 2084 apic_write(APIC_ESR, 0); 2085 apic_read(APIC_ESR); 2086 apic_write(APIC_LVTERR, apic_pm_state.apic_lvterr); 2087 apic_write(APIC_ESR, 0); 2088 apic_read(APIC_ESR); 2089 2090 if (intr_remapping_enabled) { 2091 reenable_intr_remapping(x2apic_mode); 2092 legacy_pic->restore_mask(); 2093 restore_IO_APIC_setup(ioapic_entries); 2094 free_ioapic_entries(ioapic_entries); 2095 } 2096 restore: 2097 local_irq_restore(flags); 2098 2099 return ret; 2100 } 2101 2102 /* 2103 * This device has no shutdown method - fully functioning local APICs 2104 * are needed on every CPU up until machine_halt/restart/poweroff. 2105 */ 2106 2107 static struct sysdev_class lapic_sysclass = { 2108 .name = "lapic", 2109 .resume = lapic_resume, 2110 .suspend = lapic_suspend, 2111 }; 2112 2113 static struct sys_device device_lapic = { 2114 .id = 0, 2115 .cls = &lapic_sysclass, 2116 }; 2117 2118 static void __cpuinit apic_pm_activate(void) 2119 { 2120 apic_pm_state.active = 1; 2121 } 2122 2123 static int __init init_lapic_sysfs(void) 2124 { 2125 int error; 2126 2127 if (!cpu_has_apic) 2128 return 0; 2129 /* XXX: remove suspend/resume procs if !apic_pm_state.active? */ 2130 2131 error = sysdev_class_register(&lapic_sysclass); 2132 if (!error) 2133 error = sysdev_register(&device_lapic); 2134 return error; 2135 } 2136 2137 /* local apic needs to resume before other devices access its registers. */ 2138 core_initcall(init_lapic_sysfs); 2139 2140 #else /* CONFIG_PM */ 2141 2142 static void apic_pm_activate(void) { } 2143 2144 #endif /* CONFIG_PM */ 2145 2146 #ifdef CONFIG_X86_64 2147 2148 static int __cpuinit apic_cluster_num(void) 2149 { 2150 int i, clusters, zeros; 2151 unsigned id; 2152 u16 *bios_cpu_apicid; 2153 DECLARE_BITMAP(clustermap, NUM_APIC_CLUSTERS); 2154 2155 bios_cpu_apicid = early_per_cpu_ptr(x86_bios_cpu_apicid); 2156 bitmap_zero(clustermap, NUM_APIC_CLUSTERS); 2157 2158 for (i = 0; i < nr_cpu_ids; i++) { 2159 /* are we being called early in kernel startup? */ 2160 if (bios_cpu_apicid) { 2161 id = bios_cpu_apicid[i]; 2162 } else if (i < nr_cpu_ids) { 2163 if (cpu_present(i)) 2164 id = per_cpu(x86_bios_cpu_apicid, i); 2165 else 2166 continue; 2167 } else 2168 break; 2169 2170 if (id != BAD_APICID) 2171 __set_bit(APIC_CLUSTERID(id), clustermap); 2172 } 2173 2174 /* Problem: Partially populated chassis may not have CPUs in some of 2175 * the APIC clusters they have been allocated. Only present CPUs have 2176 * x86_bios_cpu_apicid entries, thus causing zeroes in the bitmap. 2177 * Since clusters are allocated sequentially, count zeros only if 2178 * they are bounded by ones. 2179 */ 2180 clusters = 0; 2181 zeros = 0; 2182 for (i = 0; i < NUM_APIC_CLUSTERS; i++) { 2183 if (test_bit(i, clustermap)) { 2184 clusters += 1 + zeros; 2185 zeros = 0; 2186 } else 2187 ++zeros; 2188 } 2189 2190 return clusters; 2191 } 2192 2193 static int __cpuinitdata multi_checked; 2194 static int __cpuinitdata multi; 2195 2196 static int __cpuinit set_multi(const struct dmi_system_id *d) 2197 { 2198 if (multi) 2199 return 0; 2200 pr_info("APIC: %s detected, Multi Chassis\n", d->ident); 2201 multi = 1; 2202 return 0; 2203 } 2204 2205 static const __cpuinitconst struct dmi_system_id multi_dmi_table[] = { 2206 { 2207 .callback = set_multi, 2208 .ident = "IBM System Summit2", 2209 .matches = { 2210 DMI_MATCH(DMI_SYS_VENDOR, "IBM"), 2211 DMI_MATCH(DMI_PRODUCT_NAME, "Summit2"), 2212 }, 2213 }, 2214 {} 2215 }; 2216 2217 static void __cpuinit dmi_check_multi(void) 2218 { 2219 if (multi_checked) 2220 return; 2221 2222 dmi_check_system(multi_dmi_table); 2223 multi_checked = 1; 2224 } 2225 2226 /* 2227 * apic_is_clustered_box() -- Check if we can expect good TSC 2228 * 2229 * Thus far, the major user of this is IBM's Summit2 series: 2230 * Clustered boxes may have unsynced TSC problems if they are 2231 * multi-chassis. 2232 * Use DMI to check them 2233 */ 2234 __cpuinit int apic_is_clustered_box(void) 2235 { 2236 dmi_check_multi(); 2237 if (multi) 2238 return 1; 2239 2240 if (!is_vsmp_box()) 2241 return 0; 2242 2243 /* 2244 * ScaleMP vSMPowered boxes have one cluster per board and TSCs are 2245 * not guaranteed to be synced between boards 2246 */ 2247 if (apic_cluster_num() > 1) 2248 return 1; 2249 2250 return 0; 2251 } 2252 #endif 2253 2254 /* 2255 * APIC command line parameters 2256 */ 2257 static int __init setup_disableapic(char *arg) 2258 { 2259 disable_apic = 1; 2260 setup_clear_cpu_cap(X86_FEATURE_APIC); 2261 return 0; 2262 } 2263 early_param("disableapic", setup_disableapic); 2264 2265 /* same as disableapic, for compatibility */ 2266 static int __init setup_nolapic(char *arg) 2267 { 2268 return setup_disableapic(arg); 2269 } 2270 early_param("nolapic", setup_nolapic); 2271 2272 static int __init parse_lapic_timer_c2_ok(char *arg) 2273 { 2274 local_apic_timer_c2_ok = 1; 2275 return 0; 2276 } 2277 early_param("lapic_timer_c2_ok", parse_lapic_timer_c2_ok); 2278 2279 static int __init parse_disable_apic_timer(char *arg) 2280 { 2281 disable_apic_timer = 1; 2282 return 0; 2283 } 2284 early_param("noapictimer", parse_disable_apic_timer); 2285 2286 static int __init parse_nolapic_timer(char *arg) 2287 { 2288 disable_apic_timer = 1; 2289 return 0; 2290 } 2291 early_param("nolapic_timer", parse_nolapic_timer); 2292 2293 static int __init apic_set_verbosity(char *arg) 2294 { 2295 if (!arg) { 2296 #ifdef CONFIG_X86_64 2297 skip_ioapic_setup = 0; 2298 return 0; 2299 #endif 2300 return -EINVAL; 2301 } 2302 2303 if (strcmp("debug", arg) == 0) 2304 apic_verbosity = APIC_DEBUG; 2305 else if (strcmp("verbose", arg) == 0) 2306 apic_verbosity = APIC_VERBOSE; 2307 else { 2308 pr_warning("APIC Verbosity level %s not recognised" 2309 " use apic=verbose or apic=debug\n", arg); 2310 return -EINVAL; 2311 } 2312 2313 return 0; 2314 } 2315 early_param("apic", apic_set_verbosity); 2316 2317 static int __init lapic_insert_resource(void) 2318 { 2319 if (!apic_phys) 2320 return -1; 2321 2322 /* Put local APIC into the resource map. */ 2323 lapic_resource.start = apic_phys; 2324 lapic_resource.end = lapic_resource.start + PAGE_SIZE - 1; 2325 insert_resource(&iomem_resource, &lapic_resource); 2326 2327 return 0; 2328 } 2329 2330 /* 2331 * need call insert after e820_reserve_resources() 2332 * that is using request_resource 2333 */ 2334 late_initcall(lapic_insert_resource); 2335