arch/x86/include/asm/apic.h

   1 #ifndef _ASM_X86_APIC_H
   2 #define _ASM_X86_APIC_H
   3
   4 #include <linux/cpumask.h>
   5 #include <linux/pm.h>
   6
   7 #include <asm/alternative.h>
   8 #include <asm/cpufeature.h>
   9 #include <asm/processor.h>
  10 #include <asm/apicdef.h>
  11 #include <linux/atomic.h>
  12 #include <asm/fixmap.h>
  13 #include <asm/mpspec.h>
  14 #include <asm/msr.h>
  15 #include <asm/idle.h>
  16
  17 #define ARCH_APICTIMER_STOPS_ON_C3      1
  18
  19 /*
  20  * Debugging macros
  21  */
  22 #define APIC_QUIET   0
  23 #define APIC_VERBOSE 1
  24 #define APIC_DEBUG   2
  25
  26 /*
  27  * Define the default level of output to be very little
  28  * This can be turned up by using apic=verbose for more
  29  * information and apic=debug for _lots_ of information.
  30  * apic_verbosity is defined in apic.c
  31  */
  32 #define apic_printk(v, s, a...) do {       \
  33                 if ((v) <= apic_verbosity) \
  34                         printk(s, ##a);    \
  35         } while (0)
  36
  37
  38 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86_32)
  39 extern void generic_apic_probe(void);
  40 #else
  41 static inline void generic_apic_probe(void)
  42 {
  43 }
  44 #endif
  45
  46 #ifdef CONFIG_X86_LOCAL_APIC
  47
  48 extern unsigned int apic_verbosity;
  49 extern int local_apic_timer_c2_ok;
  50
  51 extern int disable_apic;
  52 extern unsigned int lapic_timer_frequency;
  53
  54 #ifdef CONFIG_SMP
  55 extern void __inquire_remote_apic(int apicid);
  56 #else /* CONFIG_SMP */
  57 static inline void __inquire_remote_apic(int apicid)
  58 {
  59 }
  60 #endif /* CONFIG_SMP */
  61
  62 static inline void default_inquire_remote_apic(int apicid)
  63 {
  64         if (apic_verbosity >= APIC_DEBUG)
  65                 __inquire_remote_apic(apicid);
  66 }
  67
  68 /*
  69  * With 82489DX we can't rely on apic feature bit
  70  * retrieved via cpuid but still have to deal with
  71  * such an apic chip so we assume that SMP configuration
  72  * is found from MP table (64bit case uses ACPI mostly
  73  * which set smp presence flag as well so we are safe
  74  * to use this helper too).
  75  */
  76 static inline bool apic_from_smp_config(void)
  77 {
  78         return smp_found_config && !disable_apic;
  79 }
  80
  81 /*
  82  * Basic functions accessing APICs.
  83  */
  84 #ifdef CONFIG_PARAVIRT
  85 #include <asm/paravirt.h>
  86 #endif
  87
  88 extern int setup_profiling_timer(unsigned int);
  89
  90 static inline void native_apic_mem_write(u32 reg, u32 v)
  91 {
  92         volatile u32 *addr = (volatile u32 *)(APIC_BASE + reg);
  93
  94         alternative_io("movl %0, %P1", "xchgl %0, %P1", X86_BUG_11AP,
  95                        ASM_OUTPUT2("=r" (v), "=m" (*addr)),
  96                        ASM_OUTPUT2("0" (v), "m" (*addr)));
  97 }
  98
  99 static inline u32 native_apic_mem_read(u32 reg)
 100 {
 101         return *((volatile u32 *)(APIC_BASE + reg));
 102 }
 103
 104 extern void native_apic_wait_icr_idle(void);
 105 extern u32 native_safe_apic_wait_icr_idle(void);
 106 extern void native_apic_icr_write(u32 low, u32 id);
 107 extern u64 native_apic_icr_read(void);
 108
 109 static inline bool apic_is_x2apic_enabled(void)
 110 {
 111         u64 msr;
 112
 113         if (rdmsrl_safe(MSR_IA32_APICBASE, &msr))
 114                 return false;
 115         return msr & X2APIC_ENABLE;
 116 }
 117
 118 #ifdef CONFIG_X86_X2APIC
 119 /*
 120  * Make previous memory operations globally visible before
 121  * sending the IPI through x2apic wrmsr. We need a serializing instruction or
 122  * mfence for this.
 123  */
 124 static inline void x2apic_wrmsr_fence(void)
 125 {
 126         asm volatile("mfence" : : : "memory");
 127 }
 128
 129 static inline void native_apic_msr_write(u32 reg, u32 v)
 130 {
 131         if (reg == APIC_DFR || reg == APIC_ID || reg == APIC_LDR ||
 132             reg == APIC_LVR)
 133                 return;
 134
 135         wrmsr(APIC_BASE_MSR + (reg >> 4), v, 0);
 136 }
 137
 138 static inline void native_apic_msr_eoi_write(u32 reg, u32 v)
 139 {
 140         wrmsr(APIC_BASE_MSR + (APIC_EOI >> 4), APIC_EOI_ACK, 0);
 141 }
 142
 143 static inline u32 native_apic_msr_read(u32 reg)
 144 {
 145         u64 msr;
 146
 147         if (reg == APIC_DFR)
 148                 return -1;
 149
 150         rdmsrl(APIC_BASE_MSR + (reg >> 4), msr);
 151         return (u32)msr;
 152 }
 153
 154 static inline void native_x2apic_wait_icr_idle(void)
 155 {
 156         /* no need to wait for icr idle in x2apic */
 157         return;
 158 }
 159
 160 static inline u32 native_safe_x2apic_wait_icr_idle(void)
 161 {
 162         /* no need to wait for icr idle in x2apic */
 163         return 0;
 164 }
 165
 166 static inline void native_x2apic_icr_write(u32 low, u32 id)
 167 {
 168         wrmsrl(APIC_BASE_MSR + (APIC_ICR >> 4), ((__u64) id) << 32 | low);
 169 }
 170
 171 static inline u64 native_x2apic_icr_read(void)
 172 {
 173         unsigned long val;
 174
 175         rdmsrl(APIC_BASE_MSR + (APIC_ICR >> 4), val);
 176         return val;
 177 }
 178
 179 extern int x2apic_mode;
 180 extern int x2apic_phys;
 181 extern void __init check_x2apic(void);
 182 extern void x2apic_setup(void);
 183 static inline int x2apic_enabled(void)
 184 {
 185         return cpu_has_x2apic && apic_is_x2apic_enabled();
 186 }
 187
 188 #define x2apic_supported()      (cpu_has_x2apic)
 189 #else
 190 static inline void check_x2apic(void) { }
 191 static inline void x2apic_setup(void) { }
 192 static inline int x2apic_enabled(void) { return 0; }
 193
 194 #define x2apic_mode             (0)
 195 #define x2apic_supported()      (0)
 196 #endif
 197
 198 extern void enable_IR_x2apic(void);
 199
 200 extern int get_physical_broadcast(void);
 201
 202 extern int lapic_get_maxlvt(void);
 203 extern void clear_local_APIC(void);
 204 extern void disconnect_bsp_APIC(int virt_wire_setup);
 205 extern void disable_local_APIC(void);
 206 extern void lapic_shutdown(void);
 207 extern void sync_Arb_IDs(void);
 208 extern void init_bsp_APIC(void);
 209 extern void setup_local_APIC(void);
 210 extern void init_apic_mappings(void);
 211 void register_lapic_address(unsigned long address);
 212 extern void setup_boot_APIC_clock(void);
 213 extern void setup_secondary_APIC_clock(void);
 214 extern int APIC_init_uniprocessor(void);
 215
 216 #ifdef CONFIG_X86_64
 217 static inline int apic_force_enable(unsigned long addr)
 218 {
 219         return -1;
 220 }
 221 #else
 222 extern int apic_force_enable(unsigned long addr);
 223 #endif
 224
 225 extern int apic_bsp_setup(bool upmode);
 226 extern void apic_ap_setup(void);
 227
 228 /*
 229  * On 32bit this is mach-xxx local
 230  */
 231 #ifdef CONFIG_X86_64
 232 extern int apic_is_clustered_box(void);
 233 #else
 234 static inline int apic_is_clustered_box(void)
 235 {
 236         return 0;
 237 }
 238 #endif
 239
 240 extern int setup_APIC_eilvt(u8 lvt_off, u8 vector, u8 msg_type, u8 mask);
 241
 242 #else /* !CONFIG_X86_LOCAL_APIC */
 243 static inline void lapic_shutdown(void) { }
 244 #define local_apic_timer_c2_ok          1
 245 static inline void init_apic_mappings(void) { }
 246 static inline void disable_local_APIC(void) { }
 247 # define setup_boot_APIC_clock x86_init_noop
 248 # define setup_secondary_APIC_clock x86_init_noop
 249 #endif /* !CONFIG_X86_LOCAL_APIC */
 250
 251 #ifdef CONFIG_X86_64
 252 #define SET_APIC_ID(x)          (apic->set_apic_id(x))
 253 #else
 254
 255 #endif
 256
 257 /*
 258  * Copyright 2004 James Cleverdon, IBM.
 259  * Subject to the GNU Public License, v.2
 260  *
 261  * Generic APIC sub-arch data struct.
 262  *
 263  * Hacked for x86-64 by James Cleverdon from i386 architecture code by
 264  * Martin Bligh, Andi Kleen, James Bottomley, John Stultz, and
 265  * James Cleverdon.
 266  */
 267 struct apic {
 268         char *name;
 269
 270         int (*probe)(void);
 271         int (*acpi_madt_oem_check)(char *oem_id, char *oem_table_id);
 272         int (*apic_id_valid)(int apicid);
 273         int (*apic_id_registered)(void);
 274
 275         u32 irq_delivery_mode;
 276         u32 irq_dest_mode;
 277
 278         const struct cpumask *(*target_cpus)(void);
 279
 280         int disable_esr;
 281
 282         int dest_logical;
 283         unsigned long (*check_apicid_used)(physid_mask_t *map, int apicid);
 284
 285         void (*vector_allocation_domain)(int cpu, struct cpumask *retmask,
 286                                          const struct cpumask *mask);
 287         void (*init_apic_ldr)(void);
 288
 289         void (*ioapic_phys_id_map)(physid_mask_t *phys_map, physid_mask_t *retmap);
 290
 291         void (*setup_apic_routing)(void);
 292         int (*cpu_present_to_apicid)(int mps_cpu);
 293         void (*apicid_to_cpu_present)(int phys_apicid, physid_mask_t *retmap);
 294         int (*check_phys_apicid_present)(int phys_apicid);
 295         int (*phys_pkg_id)(int cpuid_apic, int index_msb);
 296
 297         unsigned int (*get_apic_id)(unsigned long x);
 298         unsigned long (*set_apic_id)(unsigned int id);
 299         unsigned long apic_id_mask;
 300
 301         int (*cpu_mask_to_apicid_and)(const struct cpumask *cpumask,
 302                                       const struct cpumask *andmask,
 303                                       unsigned int *apicid);
 304
 305         /* ipi */
 306         void (*send_IPI_mask)(const struct cpumask *mask, int vector);
 307         void (*send_IPI_mask_allbutself)(const struct cpumask *mask,
 308                                          int vector);
 309         void (*send_IPI_allbutself)(int vector);
 310         void (*send_IPI_all)(int vector);
 311         void (*send_IPI_self)(int vector);
 312
 313         /* wakeup_secondary_cpu */
 314         int (*wakeup_secondary_cpu)(int apicid, unsigned long start_eip);
 315
 316         bool wait_for_init_deassert;
 317         void (*inquire_remote_apic)(int apicid);
 318
 319         /* apic ops */
 320         u32 (*read)(u32 reg);
 321         void (*write)(u32 reg, u32 v);
 322         /*
 323          * ->eoi_write() has the same signature as ->write().
 324          *
 325          * Drivers can support both ->eoi_write() and ->write() by passing the same
 326          * callback value. Kernel can override ->eoi_write() and fall back
 327          * on write for EOI.
 328          */
 329         void (*eoi_write)(u32 reg, u32 v);
 330         u64 (*icr_read)(void);
 331         void (*icr_write)(u32 low, u32 high);
 332         void (*wait_icr_idle)(void);
 333         u32 (*safe_wait_icr_idle)(void);
 334
 335 #ifdef CONFIG_X86_32
 336         /*
 337          * Called very early during boot from get_smp_config().  It should
 338          * return the logical apicid.  x86_[bios]_cpu_to_apicid is
 339          * initialized before this function is called.
 340          *
 341          * If logical apicid can't be determined that early, the function
 342          * may return BAD_APICID.  Logical apicid will be configured after
 343          * init_apic_ldr() while bringing up CPUs.  Note that NUMA affinity
 344          * won't be applied properly during early boot in this case.
 345          */
 346         int (*x86_32_early_logical_apicid)(int cpu);
 347 #endif
 348 };
 349
 350 /*
 351  * Pointer to the local APIC driver in use on this system (there's
 352  * always just one such driver in use - the kernel decides via an
 353  * early probing process which one it picks - and then sticks to it):
 354  */
 355 extern struct apic *apic;
 356
 357 /*
 358  * APIC drivers are probed based on how they are listed in the .apicdrivers
 359  * section. So the order is important and enforced by the ordering
 360  * of different apic driver files in the Makefile.
 361  *
 362  * For the files having two apic drivers, we use apic_drivers()
 363  * to enforce the order with in them.
 364  */
 365 #define apic_driver(sym)                                        \
 366         static const struct apic *__apicdrivers_##sym __used            \
 367         __aligned(sizeof(struct apic *))                        \
 368         __section(.apicdrivers) = { &sym }
 369
 370 #define apic_drivers(sym1, sym2)                                        \
 371         static struct apic *__apicdrivers_##sym1##sym2[2] __used        \
 372         __aligned(sizeof(struct apic *))                                \
 373         __section(.apicdrivers) = { &sym1, &sym2 }
 374
 375 extern struct apic *__apicdrivers[], *__apicdrivers_end[];
 376
 377 /*
 378  * APIC functionality to boot other CPUs - only used on SMP:
 379  */
 380 #ifdef CONFIG_SMP
 381 extern atomic_t init_deasserted;
 382 extern int wakeup_secondary_cpu_via_nmi(int apicid, unsigned long start_eip);
 383 #endif
 384
 385 #ifdef CONFIG_X86_LOCAL_APIC
 386
 387 static inline u32 apic_read(u32 reg)
 388 {
 389         return apic->read(reg);
 390 }
 391
 392 static inline void apic_write(u32 reg, u32 val)
 393 {
 394         apic->write(reg, val);
 395 }
 396
 397 static inline void apic_eoi(void)
 398 {
 399         apic->eoi_write(APIC_EOI, APIC_EOI_ACK);
 400 }
 401
 402 static inline u64 apic_icr_read(void)
 403 {
 404         return apic->icr_read();
 405 }
 406
 407 static inline void apic_icr_write(u32 low, u32 high)
 408 {
 409         apic->icr_write(low, high);
 410 }
 411
 412 static inline void apic_wait_icr_idle(void)
 413 {
 414         apic->wait_icr_idle();
 415 }
 416
 417 static inline u32 safe_apic_wait_icr_idle(void)
 418 {
 419         return apic->safe_wait_icr_idle();
 420 }
 421
 422 extern void __init apic_set_eoi_write(void (*eoi_write)(u32 reg, u32 v));
 423
 424 #else /* CONFIG_X86_LOCAL_APIC */
 425
 426 static inline u32 apic_read(u32 reg) { return 0; }
 427 static inline void apic_write(u32 reg, u32 val) { }
 428 static inline void apic_eoi(void) { }
 429 static inline u64 apic_icr_read(void) { return 0; }
 430 static inline void apic_icr_write(u32 low, u32 high) { }
 431 static inline void apic_wait_icr_idle(void) { }
 432 static inline u32 safe_apic_wait_icr_idle(void) { return 0; }
 433 static inline void apic_set_eoi_write(void (*eoi_write)(u32 reg, u32 v)) {}
 434
 435 #endif /* CONFIG_X86_LOCAL_APIC */
 436
 437 static inline void ack_APIC_irq(void)
 438 {
 439         /*
 440          * ack_APIC_irq() actually gets compiled as a single instruction
 441          * ... yummie.
 442          */
 443         apic_eoi();
 444 }
 445
 446 static inline unsigned default_get_apic_id(unsigned long x)
 447 {
 448         unsigned int ver = GET_APIC_VERSION(apic_read(APIC_LVR));
 449
 450         if (APIC_XAPIC(ver) || boot_cpu_has(X86_FEATURE_EXTD_APICID))
 451                 return (x >> 24) & 0xFF;
 452         else
 453                 return (x >> 24) & 0x0F;
 454 }
 455
 456 /*
 457  * Warm reset vector position:
 458  */
 459 #define TRAMPOLINE_PHYS_LOW             0x467
 460 #define TRAMPOLINE_PHYS_HIGH            0x469
 461
 462 #ifdef CONFIG_X86_64
 463 extern void apic_send_IPI_self(int vector);
 464
 465 DECLARE_PER_CPU(int, x2apic_extra_bits);
 466
 467 extern int default_cpu_present_to_apicid(int mps_cpu);
 468 extern int default_check_phys_apicid_present(int phys_apicid);
 469 #endif
 470
 471 extern void generic_bigsmp_probe(void);
 472
 473
 474 #ifdef CONFIG_X86_LOCAL_APIC
 475
 476 #include <asm/smp.h>
 477
 478 #define APIC_DFR_VALUE  (APIC_DFR_FLAT)
 479
 480 static inline const struct cpumask *default_target_cpus(void)
 481 {
 482 #ifdef CONFIG_SMP
 483         return cpu_online_mask;
 484 #else
 485         return cpumask_of(0);
 486 #endif
 487 }
 488
 489 static inline const struct cpumask *online_target_cpus(void)
 490 {
 491         return cpu_online_mask;
 492 }
 493
 494 DECLARE_EARLY_PER_CPU_READ_MOSTLY(u16, x86_bios_cpu_apicid);
 495
 496
 497 static inline unsigned int read_apic_id(void)
 498 {
 499         unsigned int reg;
 500
 501         reg = apic_read(APIC_ID);
 502
 503         return apic->get_apic_id(reg);
 504 }
 505
 506 static inline int default_apic_id_valid(int apicid)
 507 {
 508         return (apicid < 255);
 509 }
 510
 511 extern int default_acpi_madt_oem_check(char *, char *);
 512
 513 extern void default_setup_apic_routing(void);
 514
 515 extern struct apic apic_noop;
 516
 517 #ifdef CONFIG_X86_32
 518
 519 static inline int noop_x86_32_early_logical_apicid(int cpu)
 520 {
 521         return BAD_APICID;
 522 }
 523
 524 /*
 525  * Set up the logical destination ID.
 526  *
 527  * Intel recommends to set DFR, LDR and TPR before enabling
 528  * an APIC.  See e.g. "AP-388 82489DX User's Manual" (Intel
 529  * document number 292116).  So here it goes...
 530  */
 531 extern void default_init_apic_ldr(void);
 532
 533 static inline int default_apic_id_registered(void)
 534 {
 535         return physid_isset(read_apic_id(), phys_cpu_present_map);
 536 }
 537
 538 static inline int default_phys_pkg_id(int cpuid_apic, int index_msb)
 539 {
 540         return cpuid_apic >> index_msb;
 541 }
 542
 543 #endif
 544
 545 static inline int
 546 flat_cpu_mask_to_apicid_and(const struct cpumask *cpumask,
 547                             const struct cpumask *andmask,
 548                             unsigned int *apicid)
 549 {
 550         unsigned long cpu_mask = cpumask_bits(cpumask)[0] &
 551                                  cpumask_bits(andmask)[0] &
 552                                  cpumask_bits(cpu_online_mask)[0] &
 553                                  APIC_ALL_CPUS;
 554
 555         if (likely(cpu_mask)) {
 556                 *apicid = (unsigned int)cpu_mask;
 557                 return 0;
 558         } else {
 559                 return -EINVAL;
 560         }
 561 }
 562
 563 extern int
 564 default_cpu_mask_to_apicid_and(const struct cpumask *cpumask,
 565                                const struct cpumask *andmask,
 566                                unsigned int *apicid);
 567
 568 static inline void
 569 flat_vector_allocation_domain(int cpu, struct cpumask *retmask,
 570                               const struct cpumask *mask)
 571 {
 572         /* Careful. Some cpus do not strictly honor the set of cpus
 573          * specified in the interrupt destination when using lowest
 574          * priority interrupt delivery mode.
 575          *
 576          * In particular there was a hyperthreading cpu observed to
 577          * deliver interrupts to the wrong hyperthread when only one
 578          * hyperthread was specified in the interrupt desitination.
 579          */
 580         cpumask_clear(retmask);
 581         cpumask_bits(retmask)[0] = APIC_ALL_CPUS;
 582 }
 583
 584 static inline void
 585 default_vector_allocation_domain(int cpu, struct cpumask *retmask,
 586                                  const struct cpumask *mask)
 587 {
 588         cpumask_copy(retmask, cpumask_of(cpu));
 589 }
 590
 591 static inline unsigned long default_check_apicid_used(physid_mask_t *map, int apicid)
 592 {
 593         return physid_isset(apicid, *map);
 594 }
 595
 596 static inline void default_ioapic_phys_id_map(physid_mask_t *phys_map, physid_mask_t *retmap)
 597 {
 598         *retmap = *phys_map;
 599 }
 600
 601 static inline int __default_cpu_present_to_apicid(int mps_cpu)
 602 {
 603         if (mps_cpu < nr_cpu_ids && cpu_present(mps_cpu))
 604                 return (int)per_cpu(x86_bios_cpu_apicid, mps_cpu);
 605         else
 606                 return BAD_APICID;
 607 }
 608
 609 static inline int
 610 __default_check_phys_apicid_present(int phys_apicid)
 611 {
 612         return physid_isset(phys_apicid, phys_cpu_present_map);
 613 }
 614
 615 #ifdef CONFIG_X86_32
 616 static inline int default_cpu_present_to_apicid(int mps_cpu)
 617 {
 618         return __default_cpu_present_to_apicid(mps_cpu);
 619 }
 620
 621 static inline int
 622 default_check_phys_apicid_present(int phys_apicid)
 623 {
 624         return __default_check_phys_apicid_present(phys_apicid);
 625 }
 626 #else
 627 extern int default_cpu_present_to_apicid(int mps_cpu);
 628 extern int default_check_phys_apicid_present(int phys_apicid);
 629 #endif
 630
 631 #endif /* CONFIG_X86_LOCAL_APIC */
 632 extern void irq_enter(void);
 633 extern void irq_exit(void);
 634
 635 static inline void entering_irq(void)
 636 {
 637         irq_enter();
 638         exit_idle();
 639 }
 640
 641 static inline void entering_ack_irq(void)
 642 {
 643         ack_APIC_irq();
 644         entering_irq();
 645 }
 646
 647 static inline void exiting_irq(void)
 648 {
 649         irq_exit();
 650 }
 651
 652 static inline void exiting_ack_irq(void)
 653 {
 654         irq_exit();
 655         /* Ack only at the end to avoid potential reentry */
 656         ack_APIC_irq();
 657 }
 658
 659 extern void ioapic_zap_locks(void);
 660
 661 #endif /* _ASM_X86_APIC_H */