arch/x86/include/asm/apic.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 #ifndef _ASM_X86_APIC_H
   3 #define _ASM_X86_APIC_H
   4
   5 #include <linux/cpumask.h>
   6
   7 #include <asm/alternative.h>
   8 #include <asm/cpufeature.h>
   9 #include <asm/apicdef.h>
  10 #include <linux/atomic.h>
  11 #include <asm/fixmap.h>
  12 #include <asm/mpspec.h>
  13 #include <asm/msr.h>
  14 #include <asm/hardirq.h>
  15
  16 #define ARCH_APICTIMER_STOPS_ON_C3      1
  17
  18 /*
  19  * Debugging macros
  20  */
  21 #define APIC_QUIET   0
  22 #define APIC_VERBOSE 1
  23 #define APIC_DEBUG   2
  24
  25 /* Macros for apic_extnmi which controls external NMI masking */
  26 #define APIC_EXTNMI_BSP         0 /* Default */
  27 #define APIC_EXTNMI_ALL         1
  28 #define APIC_EXTNMI_NONE        2
  29
  30 /*
  31  * Define the default level of output to be very little
  32  * This can be turned up by using apic=verbose for more
  33  * information and apic=debug for _lots_ of information.
  34  * apic_verbosity is defined in apic.c
  35  */
  36 #define apic_printk(v, s, a...) do {       \
  37                 if ((v) <= apic_verbosity) \
  38                         printk(s, ##a);    \
  39         } while (0)
  40
  41
  42 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86_32)
  43 extern void generic_apic_probe(void);
  44 #else
  45 static inline void generic_apic_probe(void)
  46 {
  47 }
  48 #endif
  49
  50 #ifdef CONFIG_X86_LOCAL_APIC
  51
  52 extern int apic_verbosity;
  53 extern int local_apic_timer_c2_ok;
  54
  55 extern int disable_apic;
  56 extern unsigned int lapic_timer_period;
  57
  58 extern enum apic_intr_mode_id apic_intr_mode;
  59 enum apic_intr_mode_id {
  60         APIC_PIC,
  61         APIC_VIRTUAL_WIRE,
  62         APIC_VIRTUAL_WIRE_NO_CONFIG,
  63         APIC_SYMMETRIC_IO,
  64         APIC_SYMMETRIC_IO_NO_ROUTING
  65 };
  66
  67 #ifdef CONFIG_SMP
  68 extern void __inquire_remote_apic(int apicid);
  69 #else /* CONFIG_SMP */
  70 static inline void __inquire_remote_apic(int apicid)
  71 {
  72 }
  73 #endif /* CONFIG_SMP */
  74
  75 static inline void default_inquire_remote_apic(int apicid)
  76 {
  77         if (apic_verbosity >= APIC_DEBUG)
  78                 __inquire_remote_apic(apicid);
  79 }
  80
  81 /*
  82  * With 82489DX we can't rely on apic feature bit
  83  * retrieved via cpuid but still have to deal with
  84  * such an apic chip so we assume that SMP configuration
  85  * is found from MP table (64bit case uses ACPI mostly
  86  * which set smp presence flag as well so we are safe
  87  * to use this helper too).
  88  */
  89 static inline bool apic_from_smp_config(void)
  90 {
  91         return smp_found_config && !disable_apic;
  92 }
  93
  94 /*
  95  * Basic functions accessing APICs.
  96  */
  97 #ifdef CONFIG_PARAVIRT
  98 #include <asm/paravirt.h>
  99 #endif
 100
 101 extern int setup_profiling_timer(unsigned int);
 102
 103 static inline void native_apic_mem_write(u32 reg, u32 v)
 104 {
 105         volatile u32 *addr = (volatile u32 *)(APIC_BASE + reg);
 106
 107         alternative_io("movl %0, %P1", "xchgl %0, %P1", X86_BUG_11AP,
 108                        ASM_OUTPUT2("=r" (v), "=m" (*addr)),
 109                        ASM_OUTPUT2("0" (v), "m" (*addr)));
 110 }
 111
 112 static inline u32 native_apic_mem_read(u32 reg)
 113 {
 114         return *((volatile u32 *)(APIC_BASE + reg));
 115 }
 116
 117 extern void native_apic_wait_icr_idle(void);
 118 extern u32 native_safe_apic_wait_icr_idle(void);
 119 extern void native_apic_icr_write(u32 low, u32 id);
 120 extern u64 native_apic_icr_read(void);
 121
 122 static inline bool apic_is_x2apic_enabled(void)
 123 {
 124         u64 msr;
 125
 126         if (rdmsrl_safe(MSR_IA32_APICBASE, &msr))
 127                 return false;
 128         return msr & X2APIC_ENABLE;
 129 }
 130
 131 extern void enable_IR_x2apic(void);
 132
 133 extern int get_physical_broadcast(void);
 134
 135 extern int lapic_get_maxlvt(void);
 136 extern void clear_local_APIC(void);
 137 extern void disconnect_bsp_APIC(int virt_wire_setup);
 138 extern void disable_local_APIC(void);
 139 extern void apic_soft_disable(void);
 140 extern void lapic_shutdown(void);
 141 extern void sync_Arb_IDs(void);
 142 extern void init_bsp_APIC(void);
 143 extern void apic_intr_mode_select(void);
 144 extern void apic_intr_mode_init(void);
 145 extern void init_apic_mappings(void);
 146 void register_lapic_address(unsigned long address);
 147 extern void setup_boot_APIC_clock(void);
 148 extern void setup_secondary_APIC_clock(void);
 149 extern void lapic_update_tsc_freq(void);
 150
 151 #ifdef CONFIG_X86_64
 152 static inline int apic_force_enable(unsigned long addr)
 153 {
 154         return -1;
 155 }
 156 #else
 157 extern int apic_force_enable(unsigned long addr);
 158 #endif
 159
 160 extern void apic_ap_setup(void);
 161
 162 /*
 163  * On 32bit this is mach-xxx local
 164  */
 165 #ifdef CONFIG_X86_64
 166 extern int apic_is_clustered_box(void);
 167 #else
 168 static inline int apic_is_clustered_box(void)
 169 {
 170         return 0;
 171 }
 172 #endif
 173
 174 extern int setup_APIC_eilvt(u8 lvt_off, u8 vector, u8 msg_type, u8 mask);
 175 extern void lapic_assign_system_vectors(void);
 176 extern void lapic_assign_legacy_vector(unsigned int isairq, bool replace);
 177 extern void lapic_online(void);
 178 extern void lapic_offline(void);
 179 extern bool apic_needs_pit(void);
 180
 181 extern void apic_send_IPI_allbutself(unsigned int vector);
 182
 183 #else /* !CONFIG_X86_LOCAL_APIC */
 184 static inline void lapic_shutdown(void) { }
 185 #define local_apic_timer_c2_ok          1
 186 static inline void init_apic_mappings(void) { }
 187 static inline void disable_local_APIC(void) { }
 188 # define setup_boot_APIC_clock x86_init_noop
 189 # define setup_secondary_APIC_clock x86_init_noop
 190 static inline void lapic_update_tsc_freq(void) { }
 191 static inline void init_bsp_APIC(void) { }
 192 static inline void apic_intr_mode_select(void) { }
 193 static inline void apic_intr_mode_init(void) { }
 194 static inline void lapic_assign_system_vectors(void) { }
 195 static inline void lapic_assign_legacy_vector(unsigned int i, bool r) { }
 196 static inline bool apic_needs_pit(void) { return true; }
 197 #endif /* !CONFIG_X86_LOCAL_APIC */
 198
 199 #ifdef CONFIG_X86_X2APIC
 200 /*
 201  * Make previous memory operations globally visible before
 202  * sending the IPI through x2apic wrmsr. We need a serializing instruction or
 203  * mfence for this.
 204  */
 205 static inline void x2apic_wrmsr_fence(void)
 206 {
 207         asm volatile("mfence" : : : "memory");
 208 }
 209
 210 static inline void native_apic_msr_write(u32 reg, u32 v)
 211 {
 212         if (reg == APIC_DFR || reg == APIC_ID || reg == APIC_LDR ||
 213             reg == APIC_LVR)
 214                 return;
 215
 216         wrmsr(APIC_BASE_MSR + (reg >> 4), v, 0);
 217 }
 218
 219 static inline void native_apic_msr_eoi_write(u32 reg, u32 v)
 220 {
 221         __wrmsr(APIC_BASE_MSR + (APIC_EOI >> 4), APIC_EOI_ACK, 0);
 222 }
 223
 224 static inline u32 native_apic_msr_read(u32 reg)
 225 {
 226         u64 msr;
 227
 228         if (reg == APIC_DFR)
 229                 return -1;
 230
 231         rdmsrl(APIC_BASE_MSR + (reg >> 4), msr);
 232         return (u32)msr;
 233 }
 234
 235 static inline void native_x2apic_wait_icr_idle(void)
 236 {
 237         /* no need to wait for icr idle in x2apic */
 238         return;
 239 }
 240
 241 static inline u32 native_safe_x2apic_wait_icr_idle(void)
 242 {
 243         /* no need to wait for icr idle in x2apic */
 244         return 0;
 245 }
 246
 247 static inline void native_x2apic_icr_write(u32 low, u32 id)
 248 {
 249         wrmsrl(APIC_BASE_MSR + (APIC_ICR >> 4), ((__u64) id) << 32 | low);
 250 }
 251
 252 static inline u64 native_x2apic_icr_read(void)
 253 {
 254         unsigned long val;
 255
 256         rdmsrl(APIC_BASE_MSR + (APIC_ICR >> 4), val);
 257         return val;
 258 }
 259
 260 extern int x2apic_mode;
 261 extern int x2apic_phys;
 262 extern void __init check_x2apic(void);
 263 extern void x2apic_setup(void);
 264 static inline int x2apic_enabled(void)
 265 {
 266         return boot_cpu_has(X86_FEATURE_X2APIC) && apic_is_x2apic_enabled();
 267 }
 268
 269 #define x2apic_supported()      (boot_cpu_has(X86_FEATURE_X2APIC))
 270 #else /* !CONFIG_X86_X2APIC */
 271 static inline void check_x2apic(void) { }
 272 static inline void x2apic_setup(void) { }
 273 static inline int x2apic_enabled(void) { return 0; }
 274
 275 #define x2apic_mode             (0)
 276 #define x2apic_supported()      (0)
 277 #endif /* !CONFIG_X86_X2APIC */
 278
 279 struct irq_data;
 280
 281 /*
 282  * Copyright 2004 James Cleverdon, IBM.
 283  *
 284  * Generic APIC sub-arch data struct.
 285  *
 286  * Hacked for x86-64 by James Cleverdon from i386 architecture code by
 287  * Martin Bligh, Andi Kleen, James Bottomley, John Stultz, and
 288  * James Cleverdon.
 289  */
 290 struct apic {
 291         /* Hotpath functions first */
 292         void    (*eoi_write)(u32 reg, u32 v);
 293         void    (*native_eoi_write)(u32 reg, u32 v);
 294         void    (*write)(u32 reg, u32 v);
 295         u32     (*read)(u32 reg);
 296
 297         /* IPI related functions */
 298         void    (*wait_icr_idle)(void);
 299         u32     (*safe_wait_icr_idle)(void);
 300
 301         void    (*send_IPI)(int cpu, int vector);
 302         void    (*send_IPI_mask)(const struct cpumask *mask, int vector);
 303         void    (*send_IPI_mask_allbutself)(const struct cpumask *msk, int vec);
 304         void    (*send_IPI_allbutself)(int vector);
 305         void    (*send_IPI_all)(int vector);
 306         void    (*send_IPI_self)(int vector);
 307
 308         /* dest_logical is used by the IPI functions */
 309         u32     dest_logical;
 310         u32     disable_esr;
 311         u32     irq_delivery_mode;
 312         u32     irq_dest_mode;
 313
 314         u32     (*calc_dest_apicid)(unsigned int cpu);
 315
 316         /* ICR related functions */
 317         u64     (*icr_read)(void);
 318         void    (*icr_write)(u32 low, u32 high);
 319
 320         /* Probe, setup and smpboot functions */
 321         int     (*probe)(void);
 322         int     (*acpi_madt_oem_check)(char *oem_id, char *oem_table_id);
 323         int     (*apic_id_valid)(u32 apicid);
 324         int     (*apic_id_registered)(void);
 325
 326         bool    (*check_apicid_used)(physid_mask_t *map, int apicid);
 327         void    (*init_apic_ldr)(void);
 328         void    (*ioapic_phys_id_map)(physid_mask_t *phys_map, physid_mask_t *retmap);
 329         void    (*setup_apic_routing)(void);
 330         int     (*cpu_present_to_apicid)(int mps_cpu);
 331         void    (*apicid_to_cpu_present)(int phys_apicid, physid_mask_t *retmap);
 332         int     (*check_phys_apicid_present)(int phys_apicid);
 333         int     (*phys_pkg_id)(int cpuid_apic, int index_msb);
 334
 335         u32     (*get_apic_id)(unsigned long x);
 336         u32     (*set_apic_id)(unsigned int id);
 337
 338         /* wakeup_secondary_cpu */
 339         int     (*wakeup_secondary_cpu)(int apicid, unsigned long start_eip);
 340
 341         void    (*inquire_remote_apic)(int apicid);
 342
 343 #ifdef CONFIG_X86_32
 344         /*
 345          * Called very early during boot from get_smp_config().  It should
 346          * return the logical apicid.  x86_[bios]_cpu_to_apicid is
 347          * initialized before this function is called.
 348          *
 349          * If logical apicid can't be determined that early, the function
 350          * may return BAD_APICID.  Logical apicid will be configured after
 351          * init_apic_ldr() while bringing up CPUs.  Note that NUMA affinity
 352          * won't be applied properly during early boot in this case.
 353          */
 354         int (*x86_32_early_logical_apicid)(int cpu);
 355 #endif
 356         char    *name;
 357 };
 358
 359 /*
 360  * Pointer to the local APIC driver in use on this system (there's
 361  * always just one such driver in use - the kernel decides via an
 362  * early probing process which one it picks - and then sticks to it):
 363  */
 364 extern struct apic *apic;
 365
 366 /*
 367  * APIC drivers are probed based on how they are listed in the .apicdrivers
 368  * section. So the order is important and enforced by the ordering
 369  * of different apic driver files in the Makefile.
 370  *
 371  * For the files having two apic drivers, we use apic_drivers()
 372  * to enforce the order with in them.
 373  */
 374 #define apic_driver(sym)                                        \
 375         static const struct apic *__apicdrivers_##sym __used            \
 376         __aligned(sizeof(struct apic *))                        \
 377         __section(.apicdrivers) = { &sym }
 378
 379 #define apic_drivers(sym1, sym2)                                        \
 380         static struct apic *__apicdrivers_##sym1##sym2[2] __used        \
 381         __aligned(sizeof(struct apic *))                                \
 382         __section(.apicdrivers) = { &sym1, &sym2 }
 383
 384 extern struct apic *__apicdrivers[], *__apicdrivers_end[];
 385
 386 /*
 387  * APIC functionality to boot other CPUs - only used on SMP:
 388  */
 389 #ifdef CONFIG_SMP
 390 extern int wakeup_secondary_cpu_via_nmi(int apicid, unsigned long start_eip);
 391 extern int lapic_can_unplug_cpu(void);
 392 #endif
 393
 394 #ifdef CONFIG_X86_LOCAL_APIC
 395
 396 static inline u32 apic_read(u32 reg)
 397 {
 398         return apic->read(reg);
 399 }
 400
 401 static inline void apic_write(u32 reg, u32 val)
 402 {
 403         apic->write(reg, val);
 404 }
 405
 406 static inline void apic_eoi(void)
 407 {
 408         apic->eoi_write(APIC_EOI, APIC_EOI_ACK);
 409 }
 410
 411 static inline u64 apic_icr_read(void)
 412 {
 413         return apic->icr_read();
 414 }
 415
 416 static inline void apic_icr_write(u32 low, u32 high)
 417 {
 418         apic->icr_write(low, high);
 419 }
 420
 421 static inline void apic_wait_icr_idle(void)
 422 {
 423         apic->wait_icr_idle();
 424 }
 425
 426 static inline u32 safe_apic_wait_icr_idle(void)
 427 {
 428         return apic->safe_wait_icr_idle();
 429 }
 430
 431 extern void __init apic_set_eoi_write(void (*eoi_write)(u32 reg, u32 v));
 432
 433 #else /* CONFIG_X86_LOCAL_APIC */
 434
 435 static inline u32 apic_read(u32 reg) { return 0; }
 436 static inline void apic_write(u32 reg, u32 val) { }
 437 static inline void apic_eoi(void) { }
 438 static inline u64 apic_icr_read(void) { return 0; }
 439 static inline void apic_icr_write(u32 low, u32 high) { }
 440 static inline void apic_wait_icr_idle(void) { }
 441 static inline u32 safe_apic_wait_icr_idle(void) { return 0; }
 442 static inline void apic_set_eoi_write(void (*eoi_write)(u32 reg, u32 v)) {}
 443
 444 #endif /* CONFIG_X86_LOCAL_APIC */
 445
 446 extern void apic_ack_irq(struct irq_data *data);
 447
 448 static inline void ack_APIC_irq(void)
 449 {
 450         /*
 451          * ack_APIC_irq() actually gets compiled as a single instruction
 452          * ... yummie.
 453          */
 454         apic_eoi();
 455 }
 456
 457
 458 static inline bool lapic_vector_set_in_irr(unsigned int vector)
 459 {
 460         u32 irr = apic_read(APIC_IRR + (vector / 32 * 0x10));
 461
 462         return !!(irr & (1U << (vector % 32)));
 463 }
 464
 465 static inline unsigned default_get_apic_id(unsigned long x)
 466 {
 467         unsigned int ver = GET_APIC_VERSION(apic_read(APIC_LVR));
 468
 469         if (APIC_XAPIC(ver) || boot_cpu_has(X86_FEATURE_EXTD_APICID))
 470                 return (x >> 24) & 0xFF;
 471         else
 472                 return (x >> 24) & 0x0F;
 473 }
 474
 475 /*
 476  * Warm reset vector position:
 477  */
 478 #define TRAMPOLINE_PHYS_LOW             0x467
 479 #define TRAMPOLINE_PHYS_HIGH            0x469
 480
 481 extern void generic_bigsmp_probe(void);
 482
 483 #ifdef CONFIG_X86_LOCAL_APIC
 484
 485 #include <asm/smp.h>
 486
 487 #define APIC_DFR_VALUE  (APIC_DFR_FLAT)
 488
 489 DECLARE_EARLY_PER_CPU_READ_MOSTLY(u16, x86_bios_cpu_apicid);
 490
 491 extern struct apic apic_noop;
 492
 493 static inline unsigned int read_apic_id(void)
 494 {
 495         unsigned int reg = apic_read(APIC_ID);
 496
 497         return apic->get_apic_id(reg);
 498 }
 499
 500 extern int default_apic_id_valid(u32 apicid);
 501 extern int default_acpi_madt_oem_check(char *, char *);
 502 extern void default_setup_apic_routing(void);
 503
 504 extern u32 apic_default_calc_apicid(unsigned int cpu);
 505 extern u32 apic_flat_calc_apicid(unsigned int cpu);
 506
 507 extern bool default_check_apicid_used(physid_mask_t *map, int apicid);
 508 extern void default_ioapic_phys_id_map(physid_mask_t *phys_map, physid_mask_t *retmap);
 509 extern int default_cpu_present_to_apicid(int mps_cpu);
 510 extern int default_check_phys_apicid_present(int phys_apicid);
 511
 512 #endif /* CONFIG_X86_LOCAL_APIC */
 513
 514 #ifdef CONFIG_SMP
 515 bool apic_id_is_primary_thread(unsigned int id);
 516 void apic_smt_update(void);
 517 #else
 518 static inline bool apic_id_is_primary_thread(unsigned int id) { return false; }
 519 static inline void apic_smt_update(void) { }
 520 #endif
 521
 522 extern void irq_enter(void);
 523 extern void irq_exit(void);
 524
 525 static inline void entering_irq(void)
 526 {
 527         irq_enter();
 528         kvm_set_cpu_l1tf_flush_l1d();
 529 }
 530
 531 static inline void entering_ack_irq(void)
 532 {
 533         entering_irq();
 534         ack_APIC_irq();
 535 }
 536
 537 static inline void ipi_entering_ack_irq(void)
 538 {
 539         irq_enter();
 540         ack_APIC_irq();
 541         kvm_set_cpu_l1tf_flush_l1d();
 542 }
 543
 544 static inline void exiting_irq(void)
 545 {
 546         irq_exit();
 547 }
 548
 549 static inline void exiting_ack_irq(void)
 550 {
 551         ack_APIC_irq();
 552         irq_exit();
 553 }
 554
 555 extern void ioapic_zap_locks(void);
 556
 557 #endif /* _ASM_X86_APIC_H */