1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 #ifndef _ASM_POWERPC_INTERRUPT_H 3 #define _ASM_POWERPC_INTERRUPT_H 4 5 /* BookE/4xx */ 6 #define INTERRUPT_CRITICAL_INPUT 0x100 7 8 /* BookE */ 9 #define INTERRUPT_DEBUG 0xd00 10 #ifdef CONFIG_BOOKE 11 #define INTERRUPT_PERFMON 0x260 12 #define INTERRUPT_DOORBELL 0x280 13 #endif 14 15 /* BookS/4xx/8xx */ 16 #define INTERRUPT_MACHINE_CHECK 0x200 17 18 /* BookS/8xx */ 19 #define INTERRUPT_SYSTEM_RESET 0x100 20 21 /* BookS */ 22 #define INTERRUPT_DATA_SEGMENT 0x380 23 #define INTERRUPT_INST_SEGMENT 0x480 24 #define INTERRUPT_TRACE 0xd00 25 #define INTERRUPT_H_DATA_STORAGE 0xe00 26 #define INTERRUPT_HMI 0xe60 27 #define INTERRUPT_H_FAC_UNAVAIL 0xf80 28 #ifdef CONFIG_PPC_BOOK3S 29 #define INTERRUPT_DOORBELL 0xa00 30 #define INTERRUPT_PERFMON 0xf00 31 #define INTERRUPT_ALTIVEC_UNAVAIL 0xf20 32 #endif 33 34 /* BookE/BookS/4xx/8xx */ 35 #define INTERRUPT_DATA_STORAGE 0x300 36 #define INTERRUPT_INST_STORAGE 0x400 37 #define INTERRUPT_EXTERNAL 0x500 38 #define INTERRUPT_ALIGNMENT 0x600 39 #define INTERRUPT_PROGRAM 0x700 40 #define INTERRUPT_SYSCALL 0xc00 41 #define INTERRUPT_TRACE 0xd00 42 43 /* BookE/BookS/44x */ 44 #define INTERRUPT_FP_UNAVAIL 0x800 45 46 /* BookE/BookS/44x/8xx */ 47 #define INTERRUPT_DECREMENTER 0x900 48 49 #ifndef INTERRUPT_PERFMON 50 #define INTERRUPT_PERFMON 0x0 51 #endif 52 53 /* 8xx */ 54 #define INTERRUPT_SOFT_EMU_8xx 0x1000 55 #define INTERRUPT_INST_TLB_MISS_8xx 0x1100 56 #define INTERRUPT_DATA_TLB_MISS_8xx 0x1200 57 #define INTERRUPT_INST_TLB_ERROR_8xx 0x1300 58 #define INTERRUPT_DATA_TLB_ERROR_8xx 0x1400 59 #define INTERRUPT_DATA_BREAKPOINT_8xx 0x1c00 60 #define INTERRUPT_INST_BREAKPOINT_8xx 0x1d00 61 62 /* 603 */ 63 #define INTERRUPT_INST_TLB_MISS_603 0x1000 64 #define INTERRUPT_DATA_LOAD_TLB_MISS_603 0x1100 65 #define INTERRUPT_DATA_STORE_TLB_MISS_603 0x1200 66 67 #ifndef __ASSEMBLY__ 68 69 #include <linux/context_tracking.h> 70 #include <linux/hardirq.h> 71 #include <asm/cputime.h> 72 #include <asm/ftrace.h> 73 #include <asm/kprobes.h> 74 #include <asm/runlatch.h> 75 76 static inline void nap_adjust_return(struct pt_regs *regs) 77 { 78 #ifdef CONFIG_PPC_970_NAP 79 if (unlikely(test_thread_local_flags(_TLF_NAPPING))) { 80 /* Can avoid a test-and-clear because NMIs do not call this */ 81 clear_thread_local_flags(_TLF_NAPPING); 82 regs->nip = (unsigned long)power4_idle_nap_return; 83 } 84 #endif 85 } 86 87 struct interrupt_state { 88 }; 89 90 static inline void booke_restore_dbcr0(void) 91 { 92 #ifdef CONFIG_PPC_ADV_DEBUG_REGS 93 unsigned long dbcr0 = current->thread.debug.dbcr0; 94 95 if (IS_ENABLED(CONFIG_PPC32) && unlikely(dbcr0 & DBCR0_IDM)) { 96 mtspr(SPRN_DBSR, -1); 97 mtspr(SPRN_DBCR0, global_dbcr0[smp_processor_id()]); 98 } 99 #endif 100 } 101 102 static inline void interrupt_enter_prepare(struct pt_regs *regs, struct interrupt_state *state) 103 { 104 #ifdef CONFIG_PPC32 105 if (!arch_irq_disabled_regs(regs)) 106 trace_hardirqs_off(); 107 108 if (user_mode(regs)) { 109 kuep_lock(); 110 account_cpu_user_entry(); 111 } else { 112 kuap_save_and_lock(regs); 113 } 114 #endif 115 116 #ifdef CONFIG_PPC64 117 if (irq_soft_mask_set_return(IRQS_ALL_DISABLED) == IRQS_ENABLED) 118 trace_hardirqs_off(); 119 local_paca->irq_happened |= PACA_IRQ_HARD_DIS; 120 121 if (user_mode(regs)) { 122 CT_WARN_ON(ct_state() != CONTEXT_USER); 123 user_exit_irqoff(); 124 125 account_cpu_user_entry(); 126 account_stolen_time(); 127 } else { 128 /* 129 * CT_WARN_ON comes here via program_check_exception, 130 * so avoid recursion. 131 */ 132 if (TRAP(regs) != INTERRUPT_PROGRAM) 133 CT_WARN_ON(ct_state() != CONTEXT_KERNEL); 134 } 135 #endif 136 137 booke_restore_dbcr0(); 138 } 139 140 /* 141 * Care should be taken to note that interrupt_exit_prepare and 142 * interrupt_async_exit_prepare do not necessarily return immediately to 143 * regs context (e.g., if regs is usermode, we don't necessarily return to 144 * user mode). Other interrupts might be taken between here and return, 145 * context switch / preemption may occur in the exit path after this, or a 146 * signal may be delivered, etc. 147 * 148 * The real interrupt exit code is platform specific, e.g., 149 * interrupt_exit_user_prepare / interrupt_exit_kernel_prepare for 64s. 150 * 151 * However interrupt_nmi_exit_prepare does return directly to regs, because 152 * NMIs do not do "exit work" or replay soft-masked interrupts. 153 */ 154 static inline void interrupt_exit_prepare(struct pt_regs *regs, struct interrupt_state *state) 155 { 156 if (user_mode(regs)) 157 kuep_unlock(); 158 } 159 160 static inline void interrupt_async_enter_prepare(struct pt_regs *regs, struct interrupt_state *state) 161 { 162 #ifdef CONFIG_PPC_BOOK3S_64 163 if (cpu_has_feature(CPU_FTR_CTRL) && 164 !test_thread_local_flags(_TLF_RUNLATCH)) 165 __ppc64_runlatch_on(); 166 #endif 167 168 interrupt_enter_prepare(regs, state); 169 irq_enter(); 170 } 171 172 static inline void interrupt_async_exit_prepare(struct pt_regs *regs, struct interrupt_state *state) 173 { 174 /* 175 * Adjust at exit so the main handler sees the true NIA. This must 176 * come before irq_exit() because irq_exit can enable interrupts, and 177 * if another interrupt is taken before nap_adjust_return has run 178 * here, then that interrupt would return directly to idle nap return. 179 */ 180 nap_adjust_return(regs); 181 182 irq_exit(); 183 interrupt_exit_prepare(regs, state); 184 } 185 186 struct interrupt_nmi_state { 187 #ifdef CONFIG_PPC64 188 u8 irq_soft_mask; 189 u8 irq_happened; 190 u8 ftrace_enabled; 191 #endif 192 }; 193 194 static inline bool nmi_disables_ftrace(struct pt_regs *regs) 195 { 196 /* Allow DEC and PMI to be traced when they are soft-NMI */ 197 if (IS_ENABLED(CONFIG_PPC_BOOK3S_64)) { 198 if (TRAP(regs) == INTERRUPT_DECREMENTER) 199 return false; 200 if (TRAP(regs) == INTERRUPT_PERFMON) 201 return false; 202 } 203 if (IS_ENABLED(CONFIG_PPC_BOOK3E)) { 204 if (TRAP(regs) == INTERRUPT_PERFMON) 205 return false; 206 } 207 208 return true; 209 } 210 211 static inline void interrupt_nmi_enter_prepare(struct pt_regs *regs, struct interrupt_nmi_state *state) 212 { 213 #ifdef CONFIG_PPC64 214 state->irq_soft_mask = local_paca->irq_soft_mask; 215 state->irq_happened = local_paca->irq_happened; 216 217 /* 218 * Set IRQS_ALL_DISABLED unconditionally so irqs_disabled() does 219 * the right thing, and set IRQ_HARD_DIS. We do not want to reconcile 220 * because that goes through irq tracing which we don't want in NMI. 221 */ 222 local_paca->irq_soft_mask = IRQS_ALL_DISABLED; 223 local_paca->irq_happened |= PACA_IRQ_HARD_DIS; 224 225 /* Don't do any per-CPU operations until interrupt state is fixed */ 226 227 if (nmi_disables_ftrace(regs)) { 228 state->ftrace_enabled = this_cpu_get_ftrace_enabled(); 229 this_cpu_set_ftrace_enabled(0); 230 } 231 #endif 232 233 /* 234 * Do not use nmi_enter() for pseries hash guest taking a real-mode 235 * NMI because not everything it touches is within the RMA limit. 236 */ 237 if (!IS_ENABLED(CONFIG_PPC_BOOK3S_64) || 238 !firmware_has_feature(FW_FEATURE_LPAR) || 239 radix_enabled() || (mfmsr() & MSR_DR)) 240 nmi_enter(); 241 } 242 243 static inline void interrupt_nmi_exit_prepare(struct pt_regs *regs, struct interrupt_nmi_state *state) 244 { 245 if (!IS_ENABLED(CONFIG_PPC_BOOK3S_64) || 246 !firmware_has_feature(FW_FEATURE_LPAR) || 247 radix_enabled() || (mfmsr() & MSR_DR)) 248 nmi_exit(); 249 250 /* 251 * nmi does not call nap_adjust_return because nmi should not create 252 * new work to do (must use irq_work for that). 253 */ 254 255 #ifdef CONFIG_PPC64 256 if (nmi_disables_ftrace(regs)) 257 this_cpu_set_ftrace_enabled(state->ftrace_enabled); 258 259 /* Check we didn't change the pending interrupt mask. */ 260 WARN_ON_ONCE((state->irq_happened | PACA_IRQ_HARD_DIS) != local_paca->irq_happened); 261 local_paca->irq_happened = state->irq_happened; 262 local_paca->irq_soft_mask = state->irq_soft_mask; 263 #endif 264 } 265 266 /* 267 * Don't use noinstr here like x86, but rather add NOKPROBE_SYMBOL to each 268 * function definition. The reason for this is the noinstr section is placed 269 * after the main text section, i.e., very far away from the interrupt entry 270 * asm. That creates problems with fitting linker stubs when building large 271 * kernels. 272 */ 273 #define interrupt_handler __visible noinline notrace __no_kcsan __no_sanitize_address 274 275 /** 276 * DECLARE_INTERRUPT_HANDLER_RAW - Declare raw interrupt handler function 277 * @func: Function name of the entry point 278 * @returns: Returns a value back to asm caller 279 */ 280 #define DECLARE_INTERRUPT_HANDLER_RAW(func) \ 281 __visible long func(struct pt_regs *regs) 282 283 /** 284 * DEFINE_INTERRUPT_HANDLER_RAW - Define raw interrupt handler function 285 * @func: Function name of the entry point 286 * @returns: Returns a value back to asm caller 287 * 288 * @func is called from ASM entry code. 289 * 290 * This is a plain function which does no tracing, reconciling, etc. 291 * The macro is written so it acts as function definition. Append the 292 * body with a pair of curly brackets. 293 * 294 * raw interrupt handlers must not enable or disable interrupts, or 295 * schedule, tracing and instrumentation (ftrace, lockdep, etc) would 296 * not be advisable either, although may be possible in a pinch, the 297 * trace will look odd at least. 298 * 299 * A raw handler may call one of the other interrupt handler functions 300 * to be converted into that interrupt context without these restrictions. 301 * 302 * On PPC64, _RAW handlers may return with fast_interrupt_return. 303 * 304 * Specific handlers may have additional restrictions. 305 */ 306 #define DEFINE_INTERRUPT_HANDLER_RAW(func) \ 307 static __always_inline long ____##func(struct pt_regs *regs); \ 308 \ 309 interrupt_handler long func(struct pt_regs *regs) \ 310 { \ 311 long ret; \ 312 \ 313 ret = ____##func (regs); \ 314 \ 315 return ret; \ 316 } \ 317 NOKPROBE_SYMBOL(func); \ 318 \ 319 static __always_inline long ____##func(struct pt_regs *regs) 320 321 /** 322 * DECLARE_INTERRUPT_HANDLER - Declare synchronous interrupt handler function 323 * @func: Function name of the entry point 324 */ 325 #define DECLARE_INTERRUPT_HANDLER(func) \ 326 __visible void func(struct pt_regs *regs) 327 328 /** 329 * DEFINE_INTERRUPT_HANDLER - Define synchronous interrupt handler function 330 * @func: Function name of the entry point 331 * 332 * @func is called from ASM entry code. 333 * 334 * The macro is written so it acts as function definition. Append the 335 * body with a pair of curly brackets. 336 */ 337 #define DEFINE_INTERRUPT_HANDLER(func) \ 338 static __always_inline void ____##func(struct pt_regs *regs); \ 339 \ 340 interrupt_handler void func(struct pt_regs *regs) \ 341 { \ 342 struct interrupt_state state; \ 343 \ 344 interrupt_enter_prepare(regs, &state); \ 345 \ 346 ____##func (regs); \ 347 \ 348 interrupt_exit_prepare(regs, &state); \ 349 } \ 350 NOKPROBE_SYMBOL(func); \ 351 \ 352 static __always_inline void ____##func(struct pt_regs *regs) 353 354 /** 355 * DECLARE_INTERRUPT_HANDLER_RET - Declare synchronous interrupt handler function 356 * @func: Function name of the entry point 357 * @returns: Returns a value back to asm caller 358 */ 359 #define DECLARE_INTERRUPT_HANDLER_RET(func) \ 360 __visible long func(struct pt_regs *regs) 361 362 /** 363 * DEFINE_INTERRUPT_HANDLER_RET - Define synchronous interrupt handler function 364 * @func: Function name of the entry point 365 * @returns: Returns a value back to asm caller 366 * 367 * @func is called from ASM entry code. 368 * 369 * The macro is written so it acts as function definition. Append the 370 * body with a pair of curly brackets. 371 */ 372 #define DEFINE_INTERRUPT_HANDLER_RET(func) \ 373 static __always_inline long ____##func(struct pt_regs *regs); \ 374 \ 375 interrupt_handler long func(struct pt_regs *regs) \ 376 { \ 377 struct interrupt_state state; \ 378 long ret; \ 379 \ 380 interrupt_enter_prepare(regs, &state); \ 381 \ 382 ret = ____##func (regs); \ 383 \ 384 interrupt_exit_prepare(regs, &state); \ 385 \ 386 return ret; \ 387 } \ 388 NOKPROBE_SYMBOL(func); \ 389 \ 390 static __always_inline long ____##func(struct pt_regs *regs) 391 392 /** 393 * DECLARE_INTERRUPT_HANDLER_ASYNC - Declare asynchronous interrupt handler function 394 * @func: Function name of the entry point 395 */ 396 #define DECLARE_INTERRUPT_HANDLER_ASYNC(func) \ 397 __visible void func(struct pt_regs *regs) 398 399 /** 400 * DEFINE_INTERRUPT_HANDLER_ASYNC - Define asynchronous interrupt handler function 401 * @func: Function name of the entry point 402 * 403 * @func is called from ASM entry code. 404 * 405 * The macro is written so it acts as function definition. Append the 406 * body with a pair of curly brackets. 407 */ 408 #define DEFINE_INTERRUPT_HANDLER_ASYNC(func) \ 409 static __always_inline void ____##func(struct pt_regs *regs); \ 410 \ 411 interrupt_handler void func(struct pt_regs *regs) \ 412 { \ 413 struct interrupt_state state; \ 414 \ 415 interrupt_async_enter_prepare(regs, &state); \ 416 \ 417 ____##func (regs); \ 418 \ 419 interrupt_async_exit_prepare(regs, &state); \ 420 } \ 421 NOKPROBE_SYMBOL(func); \ 422 \ 423 static __always_inline void ____##func(struct pt_regs *regs) 424 425 /** 426 * DECLARE_INTERRUPT_HANDLER_NMI - Declare NMI interrupt handler function 427 * @func: Function name of the entry point 428 * @returns: Returns a value back to asm caller 429 */ 430 #define DECLARE_INTERRUPT_HANDLER_NMI(func) \ 431 __visible long func(struct pt_regs *regs) 432 433 /** 434 * DEFINE_INTERRUPT_HANDLER_NMI - Define NMI interrupt handler function 435 * @func: Function name of the entry point 436 * @returns: Returns a value back to asm caller 437 * 438 * @func is called from ASM entry code. 439 * 440 * The macro is written so it acts as function definition. Append the 441 * body with a pair of curly brackets. 442 */ 443 #define DEFINE_INTERRUPT_HANDLER_NMI(func) \ 444 static __always_inline long ____##func(struct pt_regs *regs); \ 445 \ 446 interrupt_handler long func(struct pt_regs *regs) \ 447 { \ 448 struct interrupt_nmi_state state; \ 449 long ret; \ 450 \ 451 interrupt_nmi_enter_prepare(regs, &state); \ 452 \ 453 ret = ____##func (regs); \ 454 \ 455 interrupt_nmi_exit_prepare(regs, &state); \ 456 \ 457 return ret; \ 458 } \ 459 NOKPROBE_SYMBOL(func); \ 460 \ 461 static __always_inline long ____##func(struct pt_regs *regs) 462 463 464 /* Interrupt handlers */ 465 /* kernel/traps.c */ 466 DECLARE_INTERRUPT_HANDLER_NMI(system_reset_exception); 467 #ifdef CONFIG_PPC_BOOK3S_64 468 DECLARE_INTERRUPT_HANDLER_ASYNC(machine_check_exception); 469 #else 470 DECLARE_INTERRUPT_HANDLER_NMI(machine_check_exception); 471 #endif 472 DECLARE_INTERRUPT_HANDLER(SMIException); 473 DECLARE_INTERRUPT_HANDLER(handle_hmi_exception); 474 DECLARE_INTERRUPT_HANDLER(unknown_exception); 475 DECLARE_INTERRUPT_HANDLER_ASYNC(unknown_async_exception); 476 DECLARE_INTERRUPT_HANDLER_NMI(unknown_nmi_exception); 477 DECLARE_INTERRUPT_HANDLER(instruction_breakpoint_exception); 478 DECLARE_INTERRUPT_HANDLER(RunModeException); 479 DECLARE_INTERRUPT_HANDLER(single_step_exception); 480 DECLARE_INTERRUPT_HANDLER(program_check_exception); 481 DECLARE_INTERRUPT_HANDLER(emulation_assist_interrupt); 482 DECLARE_INTERRUPT_HANDLER(alignment_exception); 483 DECLARE_INTERRUPT_HANDLER(StackOverflow); 484 DECLARE_INTERRUPT_HANDLER(stack_overflow_exception); 485 DECLARE_INTERRUPT_HANDLER(kernel_fp_unavailable_exception); 486 DECLARE_INTERRUPT_HANDLER(altivec_unavailable_exception); 487 DECLARE_INTERRUPT_HANDLER(vsx_unavailable_exception); 488 DECLARE_INTERRUPT_HANDLER(facility_unavailable_exception); 489 DECLARE_INTERRUPT_HANDLER(fp_unavailable_tm); 490 DECLARE_INTERRUPT_HANDLER(altivec_unavailable_tm); 491 DECLARE_INTERRUPT_HANDLER(vsx_unavailable_tm); 492 DECLARE_INTERRUPT_HANDLER_NMI(performance_monitor_exception_nmi); 493 DECLARE_INTERRUPT_HANDLER_ASYNC(performance_monitor_exception_async); 494 DECLARE_INTERRUPT_HANDLER_RAW(performance_monitor_exception); 495 DECLARE_INTERRUPT_HANDLER(DebugException); 496 DECLARE_INTERRUPT_HANDLER(altivec_assist_exception); 497 DECLARE_INTERRUPT_HANDLER(CacheLockingException); 498 DECLARE_INTERRUPT_HANDLER(SPEFloatingPointException); 499 DECLARE_INTERRUPT_HANDLER(SPEFloatingPointRoundException); 500 DECLARE_INTERRUPT_HANDLER_NMI(WatchdogException); 501 DECLARE_INTERRUPT_HANDLER(kernel_bad_stack); 502 503 /* slb.c */ 504 DECLARE_INTERRUPT_HANDLER_RAW(do_slb_fault); 505 DECLARE_INTERRUPT_HANDLER(do_bad_slb_fault); 506 507 /* hash_utils.c */ 508 DECLARE_INTERRUPT_HANDLER_RAW(do_hash_fault); 509 510 /* fault.c */ 511 DECLARE_INTERRUPT_HANDLER(do_page_fault); 512 DECLARE_INTERRUPT_HANDLER(do_bad_page_fault_segv); 513 514 /* process.c */ 515 DECLARE_INTERRUPT_HANDLER(do_break); 516 517 /* time.c */ 518 DECLARE_INTERRUPT_HANDLER_ASYNC(timer_interrupt); 519 520 /* mce.c */ 521 DECLARE_INTERRUPT_HANDLER_NMI(machine_check_early); 522 DECLARE_INTERRUPT_HANDLER_NMI(hmi_exception_realmode); 523 524 DECLARE_INTERRUPT_HANDLER_ASYNC(TAUException); 525 526 void __noreturn unrecoverable_exception(struct pt_regs *regs); 527 528 void replay_system_reset(void); 529 void replay_soft_interrupts(void); 530 531 static inline void interrupt_cond_local_irq_enable(struct pt_regs *regs) 532 { 533 if (!arch_irq_disabled_regs(regs)) 534 local_irq_enable(); 535 } 536 537 #endif /* __ASSEMBLY__ */ 538 539 #endif /* _ASM_POWERPC_INTERRUPT_H */ 540