From ceff77efa4f8d9f02d8442171b325d3b7068fe5e Mon Sep 17 00:00:00 2001 From: Nicholas Piggin Date: Tue, 16 Mar 2021 20:42:01 +1000 Subject: [PATCH] powerpc/64e/interrupt: Use new interrupt context tracking scheme With the new interrupt exit code, context tracking can be managed more precisely, so remove the last of the 64e workarounds and switch to the new context tracking code already used by 64s. Signed-off-by: Nicholas Piggin Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20210316104206.407354-8-npiggin@gmail.com --- arch/powerpc/include/asm/interrupt.h | 28 ---------------------------- arch/powerpc/kernel/interrupt.c | 16 +--------------- 2 files changed, 1 insertion(+), 43 deletions(-) diff --git a/arch/powerpc/include/asm/interrupt.h b/arch/powerpc/include/asm/interrupt.h index 104a77c00a31..a2f551938e64 100644 --- a/arch/powerpc/include/asm/interrupt.h +++ b/arch/powerpc/include/asm/interrupt.h @@ -21,9 +21,6 @@ static inline void nap_adjust_return(struct pt_regs *regs) } struct interrupt_state { -#ifdef CONFIG_PPC_BOOK3E_64 - enum ctx_state ctx_state; -#endif }; static inline void booke_restore_dbcr0(void) @@ -56,9 +53,7 @@ static inline void interrupt_enter_prepare(struct pt_regs *regs, struct interrup if (irq_soft_mask_set_return(IRQS_ALL_DISABLED) == IRQS_ENABLED) trace_hardirqs_off(); local_paca->irq_happened |= PACA_IRQ_HARD_DIS; -#endif -#ifdef CONFIG_PPC_BOOK3S_64 if (user_mode(regs)) { CT_WARN_ON(ct_state() != CONTEXT_USER); user_exit_irqoff(); @@ -75,12 +70,6 @@ static inline void interrupt_enter_prepare(struct pt_regs *regs, struct interrup } #endif -#ifdef CONFIG_PPC_BOOK3E_64 - state->ctx_state = exception_enter(); - if (user_mode(regs)) - account_cpu_user_entry(); -#endif - booke_restore_dbcr0(); } @@ -100,25 +89,8 @@ static inline void interrupt_enter_prepare(struct pt_regs *regs, struct interrup */ 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 - if (user_mode(regs)) kuep_unlock(); - /* - * 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) diff --git a/arch/powerpc/kernel/interrupt.c b/arch/powerpc/kernel/interrupt.c index 381a618b5b5b..1b0e1792ac37 100644 --- a/arch/powerpc/kernel/interrupt.c +++ b/arch/powerpc/kernel/interrupt.c @@ -235,10 +235,6 @@ static notrace void booke_load_dbcr0(void) #endif } -/* temporary hack for context tracking, removed in later patch */ -#include -asmlinkage __visible void __sched schedule_user(void); - /* * This should be called after a syscall returns, with r3 the return value * from the syscall. If this function returns non-zero, the system call @@ -296,11 +292,7 @@ again: while (unlikely(ti_flags & (_TIF_USER_WORK_MASK & ~_TIF_RESTORE_TM))) { local_irq_enable(); if (ti_flags & _TIF_NEED_RESCHED) { -#ifdef CONFIG_PPC_BOOK3E_64 - schedule_user(); -#else schedule(); -#endif } else { /* * SIGPENDING must restore signal handler function @@ -375,9 +367,7 @@ notrace unsigned long interrupt_exit_user_prepare(struct pt_regs *regs, unsigned BUG_ON(!(regs->msr & MSR_PR)); BUG_ON(!FULL_REGS(regs)); BUG_ON(arch_irq_disabled_regs(regs)); -#ifdef CONFIG_PPC_BOOK3S_64 CT_WARN_ON(ct_state() == CONTEXT_USER); -#endif /* * We don't need to restore AMR on the way back to userspace for KUAP. @@ -392,11 +382,7 @@ again: while (unlikely(ti_flags & (_TIF_USER_WORK_MASK & ~_TIF_RESTORE_TM))) { local_irq_enable(); /* returning to user: may enable */ if (ti_flags & _TIF_NEED_RESCHED) { -#ifdef CONFIG_PPC_BOOK3E_64 - schedule_user(); -#else schedule(); -#endif } else { if (ti_flags & _TIF_SIGPENDING) ret |= _TIF_RESTOREALL; @@ -464,7 +450,7 @@ notrace unsigned long interrupt_exit_kernel_prepare(struct pt_regs *regs, unsign * CT_WARN_ON comes here via program_check_exception, * so avoid recursion. */ - if (IS_ENABLED(CONFIG_BOOKS) && TRAP(regs) != 0x700) + if (TRAP(regs) != 0x700) CT_WARN_ON(ct_state() == CONTEXT_USER); kuap = kuap_get_and_assert_locked();