1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 #ifndef _ASM_POWERPC_INTERRUPT_H
3 #define _ASM_POWERPC_INTERRUPT_H
6 #define INTERRUPT_CRITICAL_INPUT 0x100
9 #define INTERRUPT_DEBUG 0xd00
11 #define INTERRUPT_PERFMON 0x260
12 #define INTERRUPT_DOORBELL 0x280
16 #define INTERRUPT_MACHINE_CHECK 0x200
19 #define INTERRUPT_SYSTEM_RESET 0x100
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
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
44 #define INTERRUPT_FP_UNAVAIL 0x800
46 /* BookE/BookS/44x/8xx */
47 #define INTERRUPT_DECREMENTER 0x900
49 #ifndef INTERRUPT_PERFMON
50 #define INTERRUPT_PERFMON 0x0
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
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
69 #include <linux/context_tracking.h>
70 #include <linux/hardirq.h>
71 #include <asm/cputime.h>
72 #include <asm/firmware.h>
73 #include <asm/ftrace.h>
74 #include <asm/kprobes.h>
75 #include <asm/runlatch.h>
77 #ifdef CONFIG_PPC_IRQ_SOFT_MASK_DEBUG
79 * WARN/BUG is handled with a program interrupt so minimise checks here to
80 * avoid recursion and maximise the chance of getting the first oops handled.
82 #define INT_SOFT_MASK_BUG_ON(regs, cond) \
84 if ((user_mode(regs) || (TRAP(regs) != INTERRUPT_PROGRAM))) \
88 #define INT_SOFT_MASK_BUG_ON(regs, cond)
91 #ifdef CONFIG_PPC_BOOK3S_64
92 extern char __end_soft_masked[];
93 bool search_kernel_soft_mask_table(unsigned long addr);
94 unsigned long search_kernel_restart_table(unsigned long addr);
96 DECLARE_STATIC_KEY_FALSE(interrupt_exit_not_reentrant);
98 static inline bool is_implicit_soft_masked(struct pt_regs *regs)
100 if (regs->msr & MSR_PR)
103 if (regs->nip >= (unsigned long)__end_soft_masked)
106 return search_kernel_soft_mask_table(regs->nip);
109 static inline void srr_regs_clobbered(void)
111 local_paca->srr_valid = 0;
112 local_paca->hsrr_valid = 0;
115 static inline unsigned long search_kernel_restart_table(unsigned long addr)
120 static inline bool is_implicit_soft_masked(struct pt_regs *regs)
125 static inline void srr_regs_clobbered(void)
130 static inline void nap_adjust_return(struct pt_regs *regs)
132 #ifdef CONFIG_PPC_970_NAP
133 if (unlikely(test_thread_local_flags(_TLF_NAPPING))) {
134 /* Can avoid a test-and-clear because NMIs do not call this */
135 clear_thread_local_flags(_TLF_NAPPING);
136 regs_set_return_ip(regs, (unsigned long)power4_idle_nap_return);
141 static inline void booke_restore_dbcr0(void)
143 #ifdef CONFIG_PPC_ADV_DEBUG_REGS
144 unsigned long dbcr0 = current->thread.debug.dbcr0;
146 if (IS_ENABLED(CONFIG_PPC32) && unlikely(dbcr0 & DBCR0_IDM)) {
147 mtspr(SPRN_DBSR, -1);
148 mtspr(SPRN_DBCR0, global_dbcr0[smp_processor_id()]);
153 static inline void interrupt_enter_prepare(struct pt_regs *regs)
156 irq_soft_mask_set(IRQS_ALL_DISABLED);
159 * If the interrupt was taken with HARD_DIS clear, then enable MSR[EE].
160 * Asynchronous interrupts get here with HARD_DIS set (see below), so
161 * this enables MSR[EE] for synchronous interrupts. IRQs remain
162 * soft-masked. The interrupt handler may later call
163 * interrupt_cond_local_irq_enable() to achieve a regular process
166 if (!(local_paca->irq_happened & PACA_IRQ_HARD_DIS)) {
167 INT_SOFT_MASK_BUG_ON(regs, !(regs->msr & MSR_EE));
172 /* Enable MSR[RI] early, to support kernel SLB and hash faults */
175 if (!arch_irq_disabled_regs(regs))
176 trace_hardirqs_off();
178 if (user_mode(regs)) {
180 CT_WARN_ON(ct_state() != CONTEXT_USER);
183 account_cpu_user_entry();
184 account_stolen_time();
186 kuap_save_and_lock(regs);
188 * CT_WARN_ON comes here via program_check_exception,
189 * so avoid recursion.
191 if (TRAP(regs) != INTERRUPT_PROGRAM)
192 CT_WARN_ON(ct_state() != CONTEXT_KERNEL &&
193 ct_state() != CONTEXT_IDLE);
194 INT_SOFT_MASK_BUG_ON(regs, is_implicit_soft_masked(regs));
195 INT_SOFT_MASK_BUG_ON(regs, arch_irq_disabled_regs(regs) &&
196 search_kernel_restart_table(regs->nip));
198 INT_SOFT_MASK_BUG_ON(regs, !arch_irq_disabled_regs(regs) &&
199 !(regs->msr & MSR_EE));
201 booke_restore_dbcr0();
205 * Care should be taken to note that interrupt_exit_prepare and
206 * interrupt_async_exit_prepare do not necessarily return immediately to
207 * regs context (e.g., if regs is usermode, we don't necessarily return to
208 * user mode). Other interrupts might be taken between here and return,
209 * context switch / preemption may occur in the exit path after this, or a
210 * signal may be delivered, etc.
212 * The real interrupt exit code is platform specific, e.g.,
213 * interrupt_exit_user_prepare / interrupt_exit_kernel_prepare for 64s.
215 * However interrupt_nmi_exit_prepare does return directly to regs, because
216 * NMIs do not do "exit work" or replay soft-masked interrupts.
218 static inline void interrupt_exit_prepare(struct pt_regs *regs)
222 static inline void interrupt_async_enter_prepare(struct pt_regs *regs)
225 /* Ensure interrupt_enter_prepare does not enable MSR[EE] */
226 local_paca->irq_happened |= PACA_IRQ_HARD_DIS;
228 interrupt_enter_prepare(regs);
229 #ifdef CONFIG_PPC_BOOK3S_64
231 * RI=1 is set by interrupt_enter_prepare, so this thread flags access
232 * has to come afterward (it can cause SLB faults).
234 if (cpu_has_feature(CPU_FTR_CTRL) &&
235 !test_thread_local_flags(_TLF_RUNLATCH))
236 __ppc64_runlatch_on();
241 static inline void interrupt_async_exit_prepare(struct pt_regs *regs)
244 * Adjust at exit so the main handler sees the true NIA. This must
245 * come before irq_exit() because irq_exit can enable interrupts, and
246 * if another interrupt is taken before nap_adjust_return has run
247 * here, then that interrupt would return directly to idle nap return.
249 nap_adjust_return(regs);
252 interrupt_exit_prepare(regs);
255 struct interrupt_nmi_state {
264 static inline bool nmi_disables_ftrace(struct pt_regs *regs)
266 /* Allow DEC and PMI to be traced when they are soft-NMI */
267 if (IS_ENABLED(CONFIG_PPC_BOOK3S_64)) {
268 if (TRAP(regs) == INTERRUPT_DECREMENTER)
270 if (TRAP(regs) == INTERRUPT_PERFMON)
273 if (IS_ENABLED(CONFIG_PPC_BOOK3E_64)) {
274 if (TRAP(regs) == INTERRUPT_PERFMON)
281 static inline void interrupt_nmi_enter_prepare(struct pt_regs *regs, struct interrupt_nmi_state *state)
284 state->irq_soft_mask = local_paca->irq_soft_mask;
285 state->irq_happened = local_paca->irq_happened;
286 state->softe = regs->softe;
289 * Set IRQS_ALL_DISABLED unconditionally so irqs_disabled() does
290 * the right thing, and set IRQ_HARD_DIS. We do not want to reconcile
291 * because that goes through irq tracing which we don't want in NMI.
293 local_paca->irq_soft_mask = IRQS_ALL_DISABLED;
294 local_paca->irq_happened |= PACA_IRQ_HARD_DIS;
296 if (!(regs->msr & MSR_EE) || is_implicit_soft_masked(regs)) {
298 * Adjust regs->softe to be soft-masked if it had not been
299 * reconcied (e.g., interrupt entry with MSR[EE]=0 but softe
300 * not yet set disabled), or if it was in an implicit soft
301 * masked state. This makes arch_irq_disabled_regs(regs)
302 * behave as expected.
304 regs->softe = IRQS_ALL_DISABLED;
309 /* Don't do any per-CPU operations until interrupt state is fixed */
311 if (nmi_disables_ftrace(regs)) {
312 state->ftrace_enabled = this_cpu_get_ftrace_enabled();
313 this_cpu_set_ftrace_enabled(0);
317 /* If data relocations are enabled, it's safe to use nmi_enter() */
318 if (mfmsr() & MSR_DR) {
324 * But do not use nmi_enter() for pseries hash guest taking a real-mode
325 * NMI because not everything it touches is within the RMA limit.
327 if (IS_ENABLED(CONFIG_PPC_BOOK3S_64) &&
328 firmware_has_feature(FW_FEATURE_LPAR) &&
333 * Likewise, don't use it if we have some form of instrumentation (like
334 * KASAN shadow) that is not safe to access in real mode (even on radix)
336 if (IS_ENABLED(CONFIG_KASAN))
339 /* Otherwise, it should be safe to call it */
343 static inline void interrupt_nmi_exit_prepare(struct pt_regs *regs, struct interrupt_nmi_state *state)
345 if (mfmsr() & MSR_DR) {
346 // nmi_exit if relocations are on
348 } else if (IS_ENABLED(CONFIG_PPC_BOOK3S_64) &&
349 firmware_has_feature(FW_FEATURE_LPAR) &&
351 // no nmi_exit for a pseries hash guest taking a real mode exception
352 } else if (IS_ENABLED(CONFIG_KASAN)) {
353 // no nmi_exit for KASAN in real mode
359 * nmi does not call nap_adjust_return because nmi should not create
360 * new work to do (must use irq_work for that).
364 #ifdef CONFIG_PPC_BOOK3S
365 if (arch_irq_disabled_regs(regs)) {
366 unsigned long rst = search_kernel_restart_table(regs->nip);
368 regs_set_return_ip(regs, rst);
372 if (nmi_disables_ftrace(regs))
373 this_cpu_set_ftrace_enabled(state->ftrace_enabled);
375 /* Check we didn't change the pending interrupt mask. */
376 WARN_ON_ONCE((state->irq_happened | PACA_IRQ_HARD_DIS) != local_paca->irq_happened);
377 regs->softe = state->softe;
378 local_paca->irq_happened = state->irq_happened;
379 local_paca->irq_soft_mask = state->irq_soft_mask;
384 * Don't use noinstr here like x86, but rather add NOKPROBE_SYMBOL to each
385 * function definition. The reason for this is the noinstr section is placed
386 * after the main text section, i.e., very far away from the interrupt entry
387 * asm. That creates problems with fitting linker stubs when building large
390 #define interrupt_handler __visible noinline notrace __no_kcsan __no_sanitize_address
393 * DECLARE_INTERRUPT_HANDLER_RAW - Declare raw interrupt handler function
394 * @func: Function name of the entry point
395 * @returns: Returns a value back to asm caller
397 #define DECLARE_INTERRUPT_HANDLER_RAW(func) \
398 __visible long func(struct pt_regs *regs)
401 * DEFINE_INTERRUPT_HANDLER_RAW - Define raw interrupt handler function
402 * @func: Function name of the entry point
403 * @returns: Returns a value back to asm caller
405 * @func is called from ASM entry code.
407 * This is a plain function which does no tracing, reconciling, etc.
408 * The macro is written so it acts as function definition. Append the
409 * body with a pair of curly brackets.
411 * raw interrupt handlers must not enable or disable interrupts, or
412 * schedule, tracing and instrumentation (ftrace, lockdep, etc) would
413 * not be advisable either, although may be possible in a pinch, the
414 * trace will look odd at least.
416 * A raw handler may call one of the other interrupt handler functions
417 * to be converted into that interrupt context without these restrictions.
419 * On PPC64, _RAW handlers may return with fast_interrupt_return.
421 * Specific handlers may have additional restrictions.
423 #define DEFINE_INTERRUPT_HANDLER_RAW(func) \
424 static __always_inline __no_sanitize_address __no_kcsan long \
425 ____##func(struct pt_regs *regs); \
427 interrupt_handler long func(struct pt_regs *regs) \
431 __hard_RI_enable(); \
433 ret = ____##func (regs); \
437 NOKPROBE_SYMBOL(func); \
439 static __always_inline __no_sanitize_address __no_kcsan long \
440 ____##func(struct pt_regs *regs)
443 * DECLARE_INTERRUPT_HANDLER - Declare synchronous interrupt handler function
444 * @func: Function name of the entry point
446 #define DECLARE_INTERRUPT_HANDLER(func) \
447 __visible void func(struct pt_regs *regs)
450 * DEFINE_INTERRUPT_HANDLER - Define synchronous interrupt handler function
451 * @func: Function name of the entry point
453 * @func is called from ASM entry code.
455 * The macro is written so it acts as function definition. Append the
456 * body with a pair of curly brackets.
458 #define DEFINE_INTERRUPT_HANDLER(func) \
459 static __always_inline void ____##func(struct pt_regs *regs); \
461 interrupt_handler void func(struct pt_regs *regs) \
463 interrupt_enter_prepare(regs); \
467 interrupt_exit_prepare(regs); \
469 NOKPROBE_SYMBOL(func); \
471 static __always_inline void ____##func(struct pt_regs *regs)
474 * DECLARE_INTERRUPT_HANDLER_RET - Declare synchronous interrupt handler function
475 * @func: Function name of the entry point
476 * @returns: Returns a value back to asm caller
478 #define DECLARE_INTERRUPT_HANDLER_RET(func) \
479 __visible long func(struct pt_regs *regs)
482 * DEFINE_INTERRUPT_HANDLER_RET - Define synchronous interrupt handler function
483 * @func: Function name of the entry point
484 * @returns: Returns a value back to asm caller
486 * @func is called from ASM entry code.
488 * The macro is written so it acts as function definition. Append the
489 * body with a pair of curly brackets.
491 #define DEFINE_INTERRUPT_HANDLER_RET(func) \
492 static __always_inline long ____##func(struct pt_regs *regs); \
494 interrupt_handler long func(struct pt_regs *regs) \
498 interrupt_enter_prepare(regs); \
500 ret = ____##func (regs); \
502 interrupt_exit_prepare(regs); \
506 NOKPROBE_SYMBOL(func); \
508 static __always_inline long ____##func(struct pt_regs *regs)
511 * DECLARE_INTERRUPT_HANDLER_ASYNC - Declare asynchronous interrupt handler function
512 * @func: Function name of the entry point
514 #define DECLARE_INTERRUPT_HANDLER_ASYNC(func) \
515 __visible void func(struct pt_regs *regs)
518 * DEFINE_INTERRUPT_HANDLER_ASYNC - Define asynchronous interrupt handler function
519 * @func: Function name of the entry point
521 * @func is called from ASM entry code.
523 * The macro is written so it acts as function definition. Append the
524 * body with a pair of curly brackets.
526 #define DEFINE_INTERRUPT_HANDLER_ASYNC(func) \
527 static __always_inline void ____##func(struct pt_regs *regs); \
529 interrupt_handler void func(struct pt_regs *regs) \
531 interrupt_async_enter_prepare(regs); \
535 interrupt_async_exit_prepare(regs); \
537 NOKPROBE_SYMBOL(func); \
539 static __always_inline void ____##func(struct pt_regs *regs)
542 * DECLARE_INTERRUPT_HANDLER_NMI - Declare NMI interrupt handler function
543 * @func: Function name of the entry point
544 * @returns: Returns a value back to asm caller
546 #define DECLARE_INTERRUPT_HANDLER_NMI(func) \
547 __visible long func(struct pt_regs *regs)
550 * DEFINE_INTERRUPT_HANDLER_NMI - Define NMI interrupt handler function
551 * @func: Function name of the entry point
552 * @returns: Returns a value back to asm caller
554 * @func is called from ASM entry code.
556 * The macro is written so it acts as function definition. Append the
557 * body with a pair of curly brackets.
559 #define DEFINE_INTERRUPT_HANDLER_NMI(func) \
560 static __always_inline __no_sanitize_address __no_kcsan long \
561 ____##func(struct pt_regs *regs); \
563 interrupt_handler long func(struct pt_regs *regs) \
565 struct interrupt_nmi_state state; \
568 interrupt_nmi_enter_prepare(regs, &state); \
570 ret = ____##func (regs); \
572 interrupt_nmi_exit_prepare(regs, &state); \
576 NOKPROBE_SYMBOL(func); \
578 static __always_inline __no_sanitize_address __no_kcsan long \
579 ____##func(struct pt_regs *regs)
582 /* Interrupt handlers */
584 DECLARE_INTERRUPT_HANDLER_NMI(system_reset_exception);
585 #ifdef CONFIG_PPC_BOOK3S_64
586 DECLARE_INTERRUPT_HANDLER_RAW(machine_check_early_boot);
587 DECLARE_INTERRUPT_HANDLER_ASYNC(machine_check_exception_async);
589 DECLARE_INTERRUPT_HANDLER_NMI(machine_check_exception);
590 DECLARE_INTERRUPT_HANDLER(SMIException);
591 DECLARE_INTERRUPT_HANDLER(handle_hmi_exception);
592 DECLARE_INTERRUPT_HANDLER(unknown_exception);
593 DECLARE_INTERRUPT_HANDLER_ASYNC(unknown_async_exception);
594 DECLARE_INTERRUPT_HANDLER_NMI(unknown_nmi_exception);
595 DECLARE_INTERRUPT_HANDLER(instruction_breakpoint_exception);
596 DECLARE_INTERRUPT_HANDLER(RunModeException);
597 DECLARE_INTERRUPT_HANDLER(single_step_exception);
598 DECLARE_INTERRUPT_HANDLER(program_check_exception);
599 DECLARE_INTERRUPT_HANDLER(emulation_assist_interrupt);
600 DECLARE_INTERRUPT_HANDLER(alignment_exception);
601 DECLARE_INTERRUPT_HANDLER(StackOverflow);
602 DECLARE_INTERRUPT_HANDLER(stack_overflow_exception);
603 DECLARE_INTERRUPT_HANDLER(kernel_fp_unavailable_exception);
604 DECLARE_INTERRUPT_HANDLER(altivec_unavailable_exception);
605 DECLARE_INTERRUPT_HANDLER(vsx_unavailable_exception);
606 DECLARE_INTERRUPT_HANDLER(facility_unavailable_exception);
607 DECLARE_INTERRUPT_HANDLER(fp_unavailable_tm);
608 DECLARE_INTERRUPT_HANDLER(altivec_unavailable_tm);
609 DECLARE_INTERRUPT_HANDLER(vsx_unavailable_tm);
610 DECLARE_INTERRUPT_HANDLER_NMI(performance_monitor_exception_nmi);
611 DECLARE_INTERRUPT_HANDLER_ASYNC(performance_monitor_exception_async);
612 DECLARE_INTERRUPT_HANDLER_RAW(performance_monitor_exception);
613 DECLARE_INTERRUPT_HANDLER(DebugException);
614 DECLARE_INTERRUPT_HANDLER(altivec_assist_exception);
615 DECLARE_INTERRUPT_HANDLER(CacheLockingException);
616 DECLARE_INTERRUPT_HANDLER(SPEFloatingPointException);
617 DECLARE_INTERRUPT_HANDLER(SPEFloatingPointRoundException);
618 DECLARE_INTERRUPT_HANDLER_NMI(WatchdogException);
619 DECLARE_INTERRUPT_HANDLER(kernel_bad_stack);
622 DECLARE_INTERRUPT_HANDLER_RAW(do_slb_fault);
623 DECLARE_INTERRUPT_HANDLER(do_bad_segment_interrupt);
626 DECLARE_INTERRUPT_HANDLER(do_hash_fault);
629 DECLARE_INTERRUPT_HANDLER(do_page_fault);
630 DECLARE_INTERRUPT_HANDLER(do_bad_page_fault_segv);
633 DECLARE_INTERRUPT_HANDLER(do_break);
636 DECLARE_INTERRUPT_HANDLER_ASYNC(timer_interrupt);
639 DECLARE_INTERRUPT_HANDLER_NMI(machine_check_early);
640 DECLARE_INTERRUPT_HANDLER_NMI(hmi_exception_realmode);
642 DECLARE_INTERRUPT_HANDLER_ASYNC(TAUException);
645 DECLARE_INTERRUPT_HANDLER_ASYNC(do_IRQ);
647 void __noreturn unrecoverable_exception(struct pt_regs *regs);
649 void replay_system_reset(void);
650 void replay_soft_interrupts(void);
652 static inline void interrupt_cond_local_irq_enable(struct pt_regs *regs)
654 if (!arch_irq_disabled_regs(regs))
658 long system_call_exception(struct pt_regs *regs, unsigned long r0);
659 notrace unsigned long syscall_exit_prepare(unsigned long r3, struct pt_regs *regs, long scv);
660 notrace unsigned long interrupt_exit_user_prepare(struct pt_regs *regs);
661 notrace unsigned long interrupt_exit_kernel_prepare(struct pt_regs *regs);
663 unsigned long syscall_exit_restart(unsigned long r3, struct pt_regs *regs);
664 unsigned long interrupt_exit_user_restart(struct pt_regs *regs);
665 unsigned long interrupt_exit_kernel_restart(struct pt_regs *regs);
668 #endif /* __ASSEMBLY__ */
670 #endif /* _ASM_POWERPC_INTERRUPT_H */