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/ftrace.h>
73 #include <asm/kprobes.h>
74 #include <asm/runlatch.h>
76 #ifdef CONFIG_PPC_BOOK3S_64
77 extern char __end_soft_masked[];
78 bool search_kernel_soft_mask_table(unsigned long addr);
79 unsigned long search_kernel_restart_table(unsigned long addr);
81 DECLARE_STATIC_KEY_FALSE(interrupt_exit_not_reentrant);
83 static inline bool is_implicit_soft_masked(struct pt_regs *regs)
85 if (regs->msr & MSR_PR)
88 if (regs->nip >= (unsigned long)__end_soft_masked)
91 return search_kernel_soft_mask_table(regs->nip);
94 static inline void srr_regs_clobbered(void)
96 local_paca->srr_valid = 0;
97 local_paca->hsrr_valid = 0;
100 static inline unsigned long search_kernel_restart_table(unsigned long addr)
105 static inline bool is_implicit_soft_masked(struct pt_regs *regs)
110 static inline void srr_regs_clobbered(void)
115 static inline void nap_adjust_return(struct pt_regs *regs)
117 #ifdef CONFIG_PPC_970_NAP
118 if (unlikely(test_thread_local_flags(_TLF_NAPPING))) {
119 /* Can avoid a test-and-clear because NMIs do not call this */
120 clear_thread_local_flags(_TLF_NAPPING);
121 regs_set_return_ip(regs, (unsigned long)power4_idle_nap_return);
126 static inline void booke_restore_dbcr0(void)
128 #ifdef CONFIG_PPC_ADV_DEBUG_REGS
129 unsigned long dbcr0 = current->thread.debug.dbcr0;
131 if (IS_ENABLED(CONFIG_PPC32) && unlikely(dbcr0 & DBCR0_IDM)) {
132 mtspr(SPRN_DBSR, -1);
133 mtspr(SPRN_DBCR0, global_dbcr0[smp_processor_id()]);
138 static inline void interrupt_enter_prepare(struct pt_regs *regs)
141 if (!arch_irq_disabled_regs(regs))
142 trace_hardirqs_off();
147 kuap_save_and_lock(regs);
150 account_cpu_user_entry();
154 bool trace_enable = false;
156 if (IS_ENABLED(CONFIG_TRACE_IRQFLAGS)) {
157 if (irq_soft_mask_set_return(IRQS_ALL_DISABLED) == IRQS_ENABLED)
160 irq_soft_mask_set(IRQS_ALL_DISABLED);
164 * If the interrupt was taken with HARD_DIS clear, then enable MSR[EE].
165 * Asynchronous interrupts get here with HARD_DIS set (see below), so
166 * this enables MSR[EE] for synchronous interrupts. IRQs remain
167 * soft-masked. The interrupt handler may later call
168 * interrupt_cond_local_irq_enable() to achieve a regular process
171 if (!(local_paca->irq_happened & PACA_IRQ_HARD_DIS)) {
172 if (IS_ENABLED(CONFIG_PPC_IRQ_SOFT_MASK_DEBUG))
173 BUG_ON(!(regs->msr & MSR_EE));
179 /* Do this when RI=1 because it can cause SLB faults */
181 trace_hardirqs_off();
183 if (user_mode(regs)) {
185 CT_WARN_ON(ct_state() != CONTEXT_USER);
188 account_cpu_user_entry();
189 account_stolen_time();
191 kuap_save_and_lock(regs);
193 * CT_WARN_ON comes here via program_check_exception,
194 * so avoid recursion.
196 if (TRAP(regs) != INTERRUPT_PROGRAM) {
197 CT_WARN_ON(ct_state() != CONTEXT_KERNEL);
198 if (IS_ENABLED(CONFIG_PPC_IRQ_SOFT_MASK_DEBUG))
199 BUG_ON(is_implicit_soft_masked(regs));
202 /* Move this under a debugging check */
203 if (IS_ENABLED(CONFIG_PPC_IRQ_SOFT_MASK_DEBUG) &&
204 arch_irq_disabled_regs(regs))
205 BUG_ON(search_kernel_restart_table(regs->nip));
207 if (IS_ENABLED(CONFIG_PPC_IRQ_SOFT_MASK_DEBUG))
208 BUG_ON(!arch_irq_disabled_regs(regs) && !(regs->msr & MSR_EE));
211 booke_restore_dbcr0();
215 * Care should be taken to note that interrupt_exit_prepare and
216 * interrupt_async_exit_prepare do not necessarily return immediately to
217 * regs context (e.g., if regs is usermode, we don't necessarily return to
218 * user mode). Other interrupts might be taken between here and return,
219 * context switch / preemption may occur in the exit path after this, or a
220 * signal may be delivered, etc.
222 * The real interrupt exit code is platform specific, e.g.,
223 * interrupt_exit_user_prepare / interrupt_exit_kernel_prepare for 64s.
225 * However interrupt_nmi_exit_prepare does return directly to regs, because
226 * NMIs do not do "exit work" or replay soft-masked interrupts.
228 static inline void interrupt_exit_prepare(struct pt_regs *regs)
232 static inline void interrupt_async_enter_prepare(struct pt_regs *regs)
235 /* Ensure interrupt_enter_prepare does not enable MSR[EE] */
236 local_paca->irq_happened |= PACA_IRQ_HARD_DIS;
238 interrupt_enter_prepare(regs);
239 #ifdef CONFIG_PPC_BOOK3S_64
241 * RI=1 is set by interrupt_enter_prepare, so this thread flags access
242 * has to come afterward (it can cause SLB faults).
244 if (cpu_has_feature(CPU_FTR_CTRL) &&
245 !test_thread_local_flags(_TLF_RUNLATCH))
246 __ppc64_runlatch_on();
251 static inline void interrupt_async_exit_prepare(struct pt_regs *regs)
254 * Adjust at exit so the main handler sees the true NIA. This must
255 * come before irq_exit() because irq_exit can enable interrupts, and
256 * if another interrupt is taken before nap_adjust_return has run
257 * here, then that interrupt would return directly to idle nap return.
259 nap_adjust_return(regs);
262 interrupt_exit_prepare(regs);
265 struct interrupt_nmi_state {
274 static inline bool nmi_disables_ftrace(struct pt_regs *regs)
276 /* Allow DEC and PMI to be traced when they are soft-NMI */
277 if (IS_ENABLED(CONFIG_PPC_BOOK3S_64)) {
278 if (TRAP(regs) == INTERRUPT_DECREMENTER)
280 if (TRAP(regs) == INTERRUPT_PERFMON)
283 if (IS_ENABLED(CONFIG_PPC_BOOK3E)) {
284 if (TRAP(regs) == INTERRUPT_PERFMON)
291 static inline void interrupt_nmi_enter_prepare(struct pt_regs *regs, struct interrupt_nmi_state *state)
294 state->irq_soft_mask = local_paca->irq_soft_mask;
295 state->irq_happened = local_paca->irq_happened;
296 state->softe = regs->softe;
299 * Set IRQS_ALL_DISABLED unconditionally so irqs_disabled() does
300 * the right thing, and set IRQ_HARD_DIS. We do not want to reconcile
301 * because that goes through irq tracing which we don't want in NMI.
303 local_paca->irq_soft_mask = IRQS_ALL_DISABLED;
304 local_paca->irq_happened |= PACA_IRQ_HARD_DIS;
306 if (!(regs->msr & MSR_EE) || is_implicit_soft_masked(regs)) {
308 * Adjust regs->softe to be soft-masked if it had not been
309 * reconcied (e.g., interrupt entry with MSR[EE]=0 but softe
310 * not yet set disabled), or if it was in an implicit soft
311 * masked state. This makes arch_irq_disabled_regs(regs)
312 * behave as expected.
314 regs->softe = IRQS_ALL_DISABLED;
319 /* Don't do any per-CPU operations until interrupt state is fixed */
321 if (nmi_disables_ftrace(regs)) {
322 state->ftrace_enabled = this_cpu_get_ftrace_enabled();
323 this_cpu_set_ftrace_enabled(0);
327 /* If data relocations are enabled, it's safe to use nmi_enter() */
328 if (mfmsr() & MSR_DR) {
334 * But do not use nmi_enter() for pseries hash guest taking a real-mode
335 * NMI because not everything it touches is within the RMA limit.
337 if (IS_ENABLED(CONFIG_PPC_BOOK3S_64) &&
338 firmware_has_feature(FW_FEATURE_LPAR) &&
343 * Likewise, don't use it if we have some form of instrumentation (like
344 * KASAN shadow) that is not safe to access in real mode (even on radix)
346 if (IS_ENABLED(CONFIG_KASAN))
349 /* Otherwise, it should be safe to call it */
353 static inline void interrupt_nmi_exit_prepare(struct pt_regs *regs, struct interrupt_nmi_state *state)
355 if (mfmsr() & MSR_DR) {
356 // nmi_exit if relocations are on
358 } else if (IS_ENABLED(CONFIG_PPC_BOOK3S_64) &&
359 firmware_has_feature(FW_FEATURE_LPAR) &&
361 // no nmi_exit for a pseries hash guest taking a real mode exception
362 } else if (IS_ENABLED(CONFIG_KASAN)) {
363 // no nmi_exit for KASAN in real mode
369 * nmi does not call nap_adjust_return because nmi should not create
370 * new work to do (must use irq_work for that).
374 #ifdef CONFIG_PPC_BOOK3S
375 if (arch_irq_disabled_regs(regs)) {
376 unsigned long rst = search_kernel_restart_table(regs->nip);
378 regs_set_return_ip(regs, rst);
382 if (nmi_disables_ftrace(regs))
383 this_cpu_set_ftrace_enabled(state->ftrace_enabled);
385 /* Check we didn't change the pending interrupt mask. */
386 WARN_ON_ONCE((state->irq_happened | PACA_IRQ_HARD_DIS) != local_paca->irq_happened);
387 regs->softe = state->softe;
388 local_paca->irq_happened = state->irq_happened;
389 local_paca->irq_soft_mask = state->irq_soft_mask;
394 * Don't use noinstr here like x86, but rather add NOKPROBE_SYMBOL to each
395 * function definition. The reason for this is the noinstr section is placed
396 * after the main text section, i.e., very far away from the interrupt entry
397 * asm. That creates problems with fitting linker stubs when building large
400 #define interrupt_handler __visible noinline notrace __no_kcsan __no_sanitize_address
403 * DECLARE_INTERRUPT_HANDLER_RAW - Declare raw interrupt handler function
404 * @func: Function name of the entry point
405 * @returns: Returns a value back to asm caller
407 #define DECLARE_INTERRUPT_HANDLER_RAW(func) \
408 __visible long func(struct pt_regs *regs)
411 * DEFINE_INTERRUPT_HANDLER_RAW - Define raw interrupt handler function
412 * @func: Function name of the entry point
413 * @returns: Returns a value back to asm caller
415 * @func is called from ASM entry code.
417 * This is a plain function which does no tracing, reconciling, etc.
418 * The macro is written so it acts as function definition. Append the
419 * body with a pair of curly brackets.
421 * raw interrupt handlers must not enable or disable interrupts, or
422 * schedule, tracing and instrumentation (ftrace, lockdep, etc) would
423 * not be advisable either, although may be possible in a pinch, the
424 * trace will look odd at least.
426 * A raw handler may call one of the other interrupt handler functions
427 * to be converted into that interrupt context without these restrictions.
429 * On PPC64, _RAW handlers may return with fast_interrupt_return.
431 * Specific handlers may have additional restrictions.
433 #define DEFINE_INTERRUPT_HANDLER_RAW(func) \
434 static __always_inline __no_sanitize_address __no_kcsan long \
435 ____##func(struct pt_regs *regs); \
437 interrupt_handler long func(struct pt_regs *regs) \
441 __hard_RI_enable(); \
443 ret = ____##func (regs); \
447 NOKPROBE_SYMBOL(func); \
449 static __always_inline __no_sanitize_address __no_kcsan long \
450 ____##func(struct pt_regs *regs)
453 * DECLARE_INTERRUPT_HANDLER - Declare synchronous interrupt handler function
454 * @func: Function name of the entry point
456 #define DECLARE_INTERRUPT_HANDLER(func) \
457 __visible void func(struct pt_regs *regs)
460 * DEFINE_INTERRUPT_HANDLER - Define synchronous interrupt handler function
461 * @func: Function name of the entry point
463 * @func is called from ASM entry code.
465 * The macro is written so it acts as function definition. Append the
466 * body with a pair of curly brackets.
468 #define DEFINE_INTERRUPT_HANDLER(func) \
469 static __always_inline void ____##func(struct pt_regs *regs); \
471 interrupt_handler void func(struct pt_regs *regs) \
473 interrupt_enter_prepare(regs); \
477 interrupt_exit_prepare(regs); \
479 NOKPROBE_SYMBOL(func); \
481 static __always_inline void ____##func(struct pt_regs *regs)
484 * DECLARE_INTERRUPT_HANDLER_RET - Declare synchronous interrupt handler function
485 * @func: Function name of the entry point
486 * @returns: Returns a value back to asm caller
488 #define DECLARE_INTERRUPT_HANDLER_RET(func) \
489 __visible long func(struct pt_regs *regs)
492 * DEFINE_INTERRUPT_HANDLER_RET - Define synchronous interrupt handler function
493 * @func: Function name of the entry point
494 * @returns: Returns a value back to asm caller
496 * @func is called from ASM entry code.
498 * The macro is written so it acts as function definition. Append the
499 * body with a pair of curly brackets.
501 #define DEFINE_INTERRUPT_HANDLER_RET(func) \
502 static __always_inline long ____##func(struct pt_regs *regs); \
504 interrupt_handler long func(struct pt_regs *regs) \
508 interrupt_enter_prepare(regs); \
510 ret = ____##func (regs); \
512 interrupt_exit_prepare(regs); \
516 NOKPROBE_SYMBOL(func); \
518 static __always_inline long ____##func(struct pt_regs *regs)
521 * DECLARE_INTERRUPT_HANDLER_ASYNC - Declare asynchronous interrupt handler function
522 * @func: Function name of the entry point
524 #define DECLARE_INTERRUPT_HANDLER_ASYNC(func) \
525 __visible void func(struct pt_regs *regs)
528 * DEFINE_INTERRUPT_HANDLER_ASYNC - Define asynchronous interrupt handler function
529 * @func: Function name of the entry point
531 * @func is called from ASM entry code.
533 * The macro is written so it acts as function definition. Append the
534 * body with a pair of curly brackets.
536 #define DEFINE_INTERRUPT_HANDLER_ASYNC(func) \
537 static __always_inline void ____##func(struct pt_regs *regs); \
539 interrupt_handler void func(struct pt_regs *regs) \
541 interrupt_async_enter_prepare(regs); \
545 interrupt_async_exit_prepare(regs); \
547 NOKPROBE_SYMBOL(func); \
549 static __always_inline void ____##func(struct pt_regs *regs)
552 * DECLARE_INTERRUPT_HANDLER_NMI - Declare NMI interrupt handler function
553 * @func: Function name of the entry point
554 * @returns: Returns a value back to asm caller
556 #define DECLARE_INTERRUPT_HANDLER_NMI(func) \
557 __visible long func(struct pt_regs *regs)
560 * DEFINE_INTERRUPT_HANDLER_NMI - Define NMI interrupt handler function
561 * @func: Function name of the entry point
562 * @returns: Returns a value back to asm caller
564 * @func is called from ASM entry code.
566 * The macro is written so it acts as function definition. Append the
567 * body with a pair of curly brackets.
569 #define DEFINE_INTERRUPT_HANDLER_NMI(func) \
570 static __always_inline __no_sanitize_address __no_kcsan long \
571 ____##func(struct pt_regs *regs); \
573 interrupt_handler long func(struct pt_regs *regs) \
575 struct interrupt_nmi_state state; \
578 interrupt_nmi_enter_prepare(regs, &state); \
580 ret = ____##func (regs); \
582 interrupt_nmi_exit_prepare(regs, &state); \
586 NOKPROBE_SYMBOL(func); \
588 static __always_inline __no_sanitize_address __no_kcsan long \
589 ____##func(struct pt_regs *regs)
592 /* Interrupt handlers */
594 DECLARE_INTERRUPT_HANDLER_NMI(system_reset_exception);
595 #ifdef CONFIG_PPC_BOOK3S_64
596 DECLARE_INTERRUPT_HANDLER_ASYNC(machine_check_exception_async);
598 DECLARE_INTERRUPT_HANDLER_NMI(machine_check_exception);
599 DECLARE_INTERRUPT_HANDLER(SMIException);
600 DECLARE_INTERRUPT_HANDLER(handle_hmi_exception);
601 DECLARE_INTERRUPT_HANDLER(unknown_exception);
602 DECLARE_INTERRUPT_HANDLER_ASYNC(unknown_async_exception);
603 DECLARE_INTERRUPT_HANDLER_NMI(unknown_nmi_exception);
604 DECLARE_INTERRUPT_HANDLER(instruction_breakpoint_exception);
605 DECLARE_INTERRUPT_HANDLER(RunModeException);
606 DECLARE_INTERRUPT_HANDLER(single_step_exception);
607 DECLARE_INTERRUPT_HANDLER(program_check_exception);
608 DECLARE_INTERRUPT_HANDLER(emulation_assist_interrupt);
609 DECLARE_INTERRUPT_HANDLER(alignment_exception);
610 DECLARE_INTERRUPT_HANDLER(StackOverflow);
611 DECLARE_INTERRUPT_HANDLER(stack_overflow_exception);
612 DECLARE_INTERRUPT_HANDLER(kernel_fp_unavailable_exception);
613 DECLARE_INTERRUPT_HANDLER(altivec_unavailable_exception);
614 DECLARE_INTERRUPT_HANDLER(vsx_unavailable_exception);
615 DECLARE_INTERRUPT_HANDLER(facility_unavailable_exception);
616 DECLARE_INTERRUPT_HANDLER(fp_unavailable_tm);
617 DECLARE_INTERRUPT_HANDLER(altivec_unavailable_tm);
618 DECLARE_INTERRUPT_HANDLER(vsx_unavailable_tm);
619 DECLARE_INTERRUPT_HANDLER_NMI(performance_monitor_exception_nmi);
620 DECLARE_INTERRUPT_HANDLER_ASYNC(performance_monitor_exception_async);
621 DECLARE_INTERRUPT_HANDLER_RAW(performance_monitor_exception);
622 DECLARE_INTERRUPT_HANDLER(DebugException);
623 DECLARE_INTERRUPT_HANDLER(altivec_assist_exception);
624 DECLARE_INTERRUPT_HANDLER(CacheLockingException);
625 DECLARE_INTERRUPT_HANDLER(SPEFloatingPointException);
626 DECLARE_INTERRUPT_HANDLER(SPEFloatingPointRoundException);
627 DECLARE_INTERRUPT_HANDLER_NMI(WatchdogException);
628 DECLARE_INTERRUPT_HANDLER(kernel_bad_stack);
631 DECLARE_INTERRUPT_HANDLER_RAW(do_slb_fault);
632 DECLARE_INTERRUPT_HANDLER(do_bad_segment_interrupt);
635 DECLARE_INTERRUPT_HANDLER(do_hash_fault);
638 DECLARE_INTERRUPT_HANDLER(do_page_fault);
639 DECLARE_INTERRUPT_HANDLER(do_bad_page_fault_segv);
642 DECLARE_INTERRUPT_HANDLER(do_break);
645 DECLARE_INTERRUPT_HANDLER_ASYNC(timer_interrupt);
648 DECLARE_INTERRUPT_HANDLER_NMI(machine_check_early);
649 DECLARE_INTERRUPT_HANDLER_NMI(hmi_exception_realmode);
651 DECLARE_INTERRUPT_HANDLER_ASYNC(TAUException);
654 DECLARE_INTERRUPT_HANDLER_ASYNC(do_IRQ);
656 void __noreturn unrecoverable_exception(struct pt_regs *regs);
658 void replay_system_reset(void);
659 void replay_soft_interrupts(void);
661 static inline void interrupt_cond_local_irq_enable(struct pt_regs *regs)
663 if (!arch_irq_disabled_regs(regs))
667 long system_call_exception(long r3, long r4, long r5, long r6, long r7, long r8,
668 unsigned long r0, struct pt_regs *regs);
669 notrace unsigned long syscall_exit_prepare(unsigned long r3, struct pt_regs *regs, long scv);
670 notrace unsigned long interrupt_exit_user_prepare(struct pt_regs *regs);
671 notrace unsigned long interrupt_exit_kernel_prepare(struct pt_regs *regs);
673 unsigned long syscall_exit_restart(unsigned long r3, struct pt_regs *regs);
674 unsigned long interrupt_exit_user_restart(struct pt_regs *regs);
675 unsigned long interrupt_exit_kernel_restart(struct pt_regs *regs);
678 #endif /* __ASSEMBLY__ */
680 #endif /* _ASM_POWERPC_INTERRUPT_H */