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 */ 558