diff options
Diffstat (limited to 'arch/powerpc/include/asm/interrupt.h')
| -rw-r--r-- | arch/powerpc/include/asm/interrupt.h | 449 |
1 files changed, 449 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/interrupt.h b/arch/powerpc/include/asm/interrupt.h new file mode 100644 index 000000000000..aedfba29e43a --- /dev/null +++ b/arch/powerpc/include/asm/interrupt.h @@ -0,0 +1,449 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +#ifndef _ASM_POWERPC_INTERRUPT_H +#define _ASM_POWERPC_INTERRUPT_H + +#include <linux/context_tracking.h> +#include <linux/hardirq.h> +#include <asm/cputime.h> +#include <asm/ftrace.h> +#include <asm/kprobes.h> +#include <asm/runlatch.h> + +struct interrupt_state { +#ifdef CONFIG_PPC_BOOK3E_64 + enum ctx_state ctx_state; +#endif +}; + +static inline void booke_restore_dbcr0(void) +{ +#ifdef CONFIG_PPC_ADV_DEBUG_REGS + unsigned long dbcr0 = current->thread.debug.dbcr0; + + if (IS_ENABLED(CONFIG_PPC32) && unlikely(dbcr0 & DBCR0_IDM)) { + mtspr(SPRN_DBSR, -1); + mtspr(SPRN_DBCR0, global_dbcr0[smp_processor_id()]); + } +#endif +} + +static inline void interrupt_enter_prepare(struct pt_regs *regs, struct interrupt_state *state) +{ + /* + * Book3E reconciles irq soft mask in asm + */ +#ifdef CONFIG_PPC_BOOK3S_64 + if (irq_soft_mask_set_return(IRQS_ALL_DISABLED) == IRQS_ENABLED) + trace_hardirqs_off(); + local_paca->irq_happened |= PACA_IRQ_HARD_DIS; + + if (user_mode(regs)) { + CT_WARN_ON(ct_state() != CONTEXT_USER); + user_exit_irqoff(); + + account_cpu_user_entry(); + account_stolen_time(); + } else { + /* + * CT_WARN_ON comes here via program_check_exception, + * so avoid recursion. + */ + if (TRAP(regs) != 0x700) + CT_WARN_ON(ct_state() != CONTEXT_KERNEL); + } +#endif + +#ifdef CONFIG_PPC_BOOK3E_64 + state->ctx_state = exception_enter(); + if (user_mode(regs)) + account_cpu_user_entry(); +#endif +} + +/* + * Care should be taken to note that interrupt_exit_prepare and + * interrupt_async_exit_prepare do not necessarily return immediately to + * regs context (e.g., if regs is usermode, we don't necessarily return to + * user mode). Other interrupts might be taken between here and return, + * context switch / preemption may occur in the exit path after this, or a + * signal may be delivered, etc. + * + * The real interrupt exit code is platform specific, e.g., + * interrupt_exit_user_prepare / interrupt_exit_kernel_prepare for 64s. + * + * However interrupt_nmi_exit_prepare does return directly to regs, because + * NMIs do not do "exit work" or replay soft-masked interrupts. + */ +static inline void interrupt_exit_prepare(struct pt_regs *regs, struct interrupt_state *state) +{ +#ifdef CONFIG_PPC_BOOK3E_64 + exception_exit(state->ctx_state); +#endif + + /* + * Book3S exits to user via interrupt_exit_user_prepare(), which does + * context tracking, which is a cleaner way to handle PREEMPT=y + * and avoid context entry/exit in e.g., preempt_schedule_irq()), + * which is likely to be where the core code wants to end up. + * + * The above comment explains why we can't do the + * + * if (user_mode(regs)) + * user_exit_irqoff(); + * + * sequence here. + */ +} + +static inline void interrupt_async_enter_prepare(struct pt_regs *regs, struct interrupt_state *state) +{ +#ifdef CONFIG_PPC_BOOK3S_64 + if (cpu_has_feature(CPU_FTR_CTRL) && + !test_thread_local_flags(_TLF_RUNLATCH)) + __ppc64_runlatch_on(); +#endif + + interrupt_enter_prepare(regs, state); + irq_enter(); +} + +static inline void interrupt_async_exit_prepare(struct pt_regs *regs, struct interrupt_state *state) +{ + irq_exit(); + interrupt_exit_prepare(regs, state); +} + +struct interrupt_nmi_state { +#ifdef CONFIG_PPC64 +#ifdef CONFIG_PPC_BOOK3S_64 + u8 irq_soft_mask; + u8 irq_happened; +#endif + u8 ftrace_enabled; +#endif +}; + +static inline void interrupt_nmi_enter_prepare(struct pt_regs *regs, struct interrupt_nmi_state *state) +{ +#ifdef CONFIG_PPC64 +#ifdef CONFIG_PPC_BOOK3S_64 + state->irq_soft_mask = local_paca->irq_soft_mask; + state->irq_happened = local_paca->irq_happened; + + /* + * Set IRQS_ALL_DISABLED unconditionally so irqs_disabled() does + * the right thing, and set IRQ_HARD_DIS. We do not want to reconcile + * because that goes through irq tracing which we don't want in NMI. + */ + local_paca->irq_soft_mask = IRQS_ALL_DISABLED; + local_paca->irq_happened |= PACA_IRQ_HARD_DIS; + + /* Don't do any per-CPU operations until interrupt state is fixed */ +#endif + /* Allow DEC and PMI to be traced when they are soft-NMI */ + if (TRAP(regs) != 0x900 && TRAP(regs) != 0xf00 && TRAP(regs) != 0x260) { + state->ftrace_enabled = this_cpu_get_ftrace_enabled(); + this_cpu_set_ftrace_enabled(0); + } +#endif + + /* + * Do not use nmi_enter() for pseries hash guest taking a real-mode + * NMI because not everything it touches is within the RMA limit. + */ + if (!IS_ENABLED(CONFIG_PPC_BOOK3S_64) || + !firmware_has_feature(FW_FEATURE_LPAR) || + radix_enabled() || (mfmsr() & MSR_DR)) + nmi_enter(); +} + +static inline void interrupt_nmi_exit_prepare(struct pt_regs *regs, struct interrupt_nmi_state *state) +{ + if (!IS_ENABLED(CONFIG_PPC_BOOK3S_64) || + !firmware_has_feature(FW_FEATURE_LPAR) || + radix_enabled() || (mfmsr() & MSR_DR)) + nmi_exit(); + +#ifdef CONFIG_PPC64 + if (TRAP(regs) != 0x900 && TRAP(regs) != 0xf00 && TRAP(regs) != 0x260) + this_cpu_set_ftrace_enabled(state->ftrace_enabled); + +#ifdef CONFIG_PPC_BOOK3S_64 + /* Check we didn't change the pending interrupt mask. */ + WARN_ON_ONCE((state->irq_happened | PACA_IRQ_HARD_DIS) != local_paca->irq_happened); + local_paca->irq_happened = state->irq_happened; + local_paca->irq_soft_mask = state->irq_soft_mask; +#endif +#endif +} + +/* + * Don't use noinstr here like x86, but rather add NOKPROBE_SYMBOL to each + * function definition. The reason for this is the noinstr section is placed + * after the main text section, i.e., very far away from the interrupt entry + * asm. That creates problems with fitting linker stubs when building large + * kernels. + */ +#define interrupt_handler __visible noinline notrace __no_kcsan __no_sanitize_address + +/** + * DECLARE_INTERRUPT_HANDLER_RAW - Declare raw interrupt handler function + * @func: Function name of the entry point + * @returns: Returns a value back to asm caller + */ +#define DECLARE_INTERRUPT_HANDLER_RAW(func) \ + __visible long func(struct pt_regs *regs) + +/** + * DEFINE_INTERRUPT_HANDLER_RAW - Define raw interrupt handler function + * @func: Function name of the entry point + * @returns: Returns a value back to asm caller + * + * @func is called from ASM entry code. + * + * This is a plain function which does no tracing, reconciling, etc. + * The macro is written so it acts as function definition. Append the + * body with a pair of curly brackets. + * + * raw interrupt handlers must not enable or disable interrupts, or + * schedule, tracing and instrumentation (ftrace, lockdep, etc) would + * not be advisable either, although may be possible in a pinch, the + * trace will look odd at least. + * + * A raw handler may call one of the other interrupt handler functions + * to be converted into that interrupt context without these restrictions. + * + * On PPC64, _RAW handlers may return with fast_interrupt_return. + * + * Specific handlers may have additional restrictions. + */ +#define DEFINE_INTERRUPT_HANDLER_RAW(func) \ +static __always_inline long ____##func(struct pt_regs *regs); \ + \ +interrupt_handler long func(struct pt_regs *regs) \ +{ \ + long ret; \ + \ + ret = ____##func (regs); \ + \ + return ret; \ +} \ +NOKPROBE_SYMBOL(func); \ + \ +static __always_inline long ____##func(struct pt_regs *regs) + +/** + * DECLARE_INTERRUPT_HANDLER - Declare synchronous interrupt handler function + * @func: Function name of the entry point + */ +#define DECLARE_INTERRUPT_HANDLER(func) \ + __visible void func(struct pt_regs *regs) + +/** + * DEFINE_INTERRUPT_HANDLER - Define synchronous interrupt handler function + * @func: Function name of the entry point + * + * @func is called from ASM entry code. + * + * The macro is written so it acts as function definition. Append the + * body with a pair of curly brackets. + */ +#define DEFINE_INTERRUPT_HANDLER(func) \ +static __always_inline void ____##func(struct pt_regs *regs); \ + \ +interrupt_handler void func(struct pt_regs *regs) \ +{ \ + struct interrupt_state state; \ + \ + interrupt_enter_prepare(regs, &state); \ + \ + ____##func (regs); \ + \ + interrupt_exit_prepare(regs, &state); \ +} \ +NOKPROBE_SYMBOL(func); \ + \ +static __always_inline void ____##func(struct pt_regs *regs) + +/** + * DECLARE_INTERRUPT_HANDLER_RET - Declare synchronous interrupt handler function + * @func: Function name of the entry point + * @returns: Returns a value back to asm caller + */ +#define DECLARE_INTERRUPT_HANDLER_RET(func) \ + __visible long func(struct pt_regs *regs) + +/** + * DEFINE_INTERRUPT_HANDLER_RET - Define synchronous interrupt handler function + * @func: Function name of the entry point + * @returns: Returns a value back to asm caller + * + * @func is called from ASM entry code. + * + * The macro is written so it acts as function definition. Append the + * body with a pair of curly brackets. + */ +#define DEFINE_INTERRUPT_HANDLER_RET(func) \ +static __always_inline long ____##func(struct pt_regs *regs); \ + \ +interrupt_handler long func(struct pt_regs *regs) \ +{ \ + struct interrupt_state state; \ + long ret; \ + \ + interrupt_enter_prepare(regs, &state); \ + \ + ret = ____##func (regs); \ + \ + interrupt_exit_prepare(regs, &state); \ + \ + return ret; \ +} \ +NOKPROBE_SYMBOL(func); \ + \ +static __always_inline long ____##func(struct pt_regs *regs) + +/** + * DECLARE_INTERRUPT_HANDLER_ASYNC - Declare asynchronous interrupt handler function + * @func: Function name of the entry point + */ +#define DECLARE_INTERRUPT_HANDLER_ASYNC(func) \ + __visible void func(struct pt_regs *regs) + +/** + * DEFINE_INTERRUPT_HANDLER_ASYNC - Define asynchronous interrupt handler function + * @func: Function name of the entry point + * + * @func is called from ASM entry code. + * + * The macro is written so it acts as function definition. Append the + * body with a pair of curly brackets. + */ +#define DEFINE_INTERRUPT_HANDLER_ASYNC(func) \ +static __always_inline void ____##func(struct pt_regs *regs); \ + \ +interrupt_handler void func(struct pt_regs *regs) \ +{ \ + struct interrupt_state state; \ + \ + interrupt_async_enter_prepare(regs, &state); \ + \ + ____##func (regs); \ + \ + interrupt_async_exit_prepare(regs, &state); \ +} \ +NOKPROBE_SYMBOL(func); \ + \ +static __always_inline void ____##func(struct pt_regs *regs) + +/** + * DECLARE_INTERRUPT_HANDLER_NMI - Declare NMI interrupt handler function + * @func: Function name of the entry point + * @returns: Returns a value back to asm caller + */ +#define DECLARE_INTERRUPT_HANDLER_NMI(func) \ + __visible long func(struct pt_regs *regs) + +/** + * DEFINE_INTERRUPT_HANDLER_NMI - Define NMI interrupt handler function + * @func: Function name of the entry point + * @returns: Returns a value back to asm caller + * + * @func is called from ASM entry code. + * + * The macro is written so it acts as function definition. Append the + * body with a pair of curly brackets. + */ +#define DEFINE_INTERRUPT_HANDLER_NMI(func) \ +static __always_inline long ____##func(struct pt_regs *regs); \ + \ +interrupt_handler long func(struct pt_regs *regs) \ +{ \ + struct interrupt_nmi_state state; \ + long ret; \ + \ + interrupt_nmi_enter_prepare(regs, &state); \ + \ + ret = ____##func (regs); \ + \ + interrupt_nmi_exit_prepare(regs, &state); \ + \ + return ret; \ +} \ +NOKPROBE_SYMBOL(func); \ + \ +static __always_inline long ____##func(struct pt_regs *regs) + + +/* Interrupt handlers */ +/* kernel/traps.c */ +DECLARE_INTERRUPT_HANDLER_NMI(system_reset_exception); +#ifdef CONFIG_PPC_BOOK3S_64 +DECLARE_INTERRUPT_HANDLER_ASYNC(machine_check_exception); +#else +DECLARE_INTERRUPT_HANDLER_NMI(machine_check_exception); +#endif +DECLARE_INTERRUPT_HANDLER(SMIException); +DECLARE_INTERRUPT_HANDLER(handle_hmi_exception); +DECLARE_INTERRUPT_HANDLER(unknown_exception); +DECLARE_INTERRUPT_HANDLER_ASYNC(unknown_async_exception); +DECLARE_INTERRUPT_HANDLER(instruction_breakpoint_exception); +DECLARE_INTERRUPT_HANDLER(RunModeException); +DECLARE_INTERRUPT_HANDLER(single_step_exception); +DECLARE_INTERRUPT_HANDLER(program_check_exception); +DECLARE_INTERRUPT_HANDLER(emulation_assist_interrupt); +DECLARE_INTERRUPT_HANDLER(alignment_exception); +DECLARE_INTERRUPT_HANDLER(StackOverflow); +DECLARE_INTERRUPT_HANDLER(stack_overflow_exception); +DECLARE_INTERRUPT_HANDLER(kernel_fp_unavailable_exception); +DECLARE_INTERRUPT_HANDLER(altivec_unavailable_exception); +DECLARE_INTERRUPT_HANDLER(vsx_unavailable_exception); +DECLARE_INTERRUPT_HANDLER(facility_unavailable_exception); +DECLARE_INTERRUPT_HANDLER(fp_unavailable_tm); +DECLARE_INTERRUPT_HANDLER(altivec_unavailable_tm); +DECLARE_INTERRUPT_HANDLER(vsx_unavailable_tm); +DECLARE_INTERRUPT_HANDLER_NMI(performance_monitor_exception_nmi); +DECLARE_INTERRUPT_HANDLER_ASYNC(performance_monitor_exception_async); +DECLARE_INTERRUPT_HANDLER_RAW(performance_monitor_exception); +DECLARE_INTERRUPT_HANDLER(DebugException); +DECLARE_INTERRUPT_HANDLER(altivec_assist_exception); +DECLARE_INTERRUPT_HANDLER(CacheLockingException); +DECLARE_INTERRUPT_HANDLER(SPEFloatingPointException); +DECLARE_INTERRUPT_HANDLER(SPEFloatingPointRoundException); +DECLARE_INTERRUPT_HANDLER(unrecoverable_exception); +DECLARE_INTERRUPT_HANDLER(WatchdogException); +DECLARE_INTERRUPT_HANDLER(kernel_bad_stack); + +/* slb.c */ +DECLARE_INTERRUPT_HANDLER_RAW(do_slb_fault); +DECLARE_INTERRUPT_HANDLER(do_bad_slb_fault); + +/* hash_utils.c */ +DECLARE_INTERRUPT_HANDLER_RAW(do_hash_fault); + +/* fault.c */ +DECLARE_INTERRUPT_HANDLER_RET(do_page_fault); +DECLARE_INTERRUPT_HANDLER(do_bad_page_fault_segv); + +/* process.c */ +DECLARE_INTERRUPT_HANDLER(do_break); + +/* time.c */ +DECLARE_INTERRUPT_HANDLER_ASYNC(timer_interrupt); + +/* mce.c */ +DECLARE_INTERRUPT_HANDLER_NMI(machine_check_early); +DECLARE_INTERRUPT_HANDLER_NMI(hmi_exception_realmode); + +DECLARE_INTERRUPT_HANDLER_ASYNC(TAUException); + +void replay_system_reset(void); +void replay_soft_interrupts(void); + +static inline void interrupt_cond_local_irq_enable(struct pt_regs *regs) +{ + if (!arch_irq_disabled_regs(regs)) + local_irq_enable(); +} + +#endif /* _ASM_POWERPC_INTERRUPT_H */ |