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Sat, 05 Sep 2020 10:44:10 -0700 (PDT) Received: from bobo.ozlabs.ibm.com ([203.185.249.227]) by smtp.gmail.com with ESMTPSA id i1sm10405317pfk.21.2020.09.05.10.44.08 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 05 Sep 2020 10:44:10 -0700 (PDT) From: Nicholas Piggin To: Subject: [RFC PATCH 10/12] powerpc/64s: move NMI soft-mask handling to C Date: Sun, 6 Sep 2020 03:43:33 +1000 Message-Id: <20200905174335.3161229-11-npiggin@gmail.com> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20200905174335.3161229-1-npiggin@gmail.com> References: <20200905174335.3161229-1-npiggin@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linuxppc-dev@lists.ozlabs.org, Nicholas Piggin Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" Saving and restoring soft-mask state can now be done in C using the interrupt handler wrapper functions. Signed-off-by: Nicholas Piggin --- arch/powerpc/include/asm/interrupt.h | 25 ++++++++++++ arch/powerpc/kernel/exceptions-64s.S | 60 ---------------------------- 2 files changed, 25 insertions(+), 60 deletions(-) diff --git a/arch/powerpc/include/asm/interrupt.h b/arch/powerpc/include/asm/interrupt.h index 69eb8a432984..c26a7c466416 100644 --- a/arch/powerpc/include/asm/interrupt.h +++ b/arch/powerpc/include/asm/interrupt.h @@ -33,12 +33,30 @@ static inline void interrupt_enter_prepare(struct pt_regs *regs) 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_PPC_BOOK3S_64 + state->irq_soft_mask = local_paca->irq_soft_mask; + state->irq_happened = local_paca->irq_happened; + state->ftrace_enabled = this_cpu_get_ftrace_enabled(); + + /* + * 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; +#endif + this_cpu_set_ftrace_enabled(0); nmi_enter(); @@ -49,6 +67,13 @@ static inline void interrupt_nmi_exit_prepare(struct pt_regs *regs, struct inter nmi_exit(); 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 } diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S index 121a55c87c02..0949dd47be59 100644 --- a/arch/powerpc/kernel/exceptions-64s.S +++ b/arch/powerpc/kernel/exceptions-64s.S @@ -1010,20 +1010,6 @@ EXC_COMMON_BEGIN(system_reset_common) ld r1,PACA_NMI_EMERG_SP(r13) subi r1,r1,INT_FRAME_SIZE __GEN_COMMON_BODY system_reset - /* - * Set IRQS_ALL_DISABLED unconditionally so irqs_disabled() does - * the right thing. We do not want to reconcile because that goes - * through irq tracing which we don't want in NMI. - * - * Save PACAIRQHAPPENED to RESULT (otherwise unused), and set HARD_DIS - * as we are running with MSR[EE]=0. - */ - li r10,IRQS_ALL_DISABLED - stb r10,PACAIRQSOFTMASK(r13) - lbz r10,PACAIRQHAPPENED(r13) - std r10,RESULT(r1) - ori r10,r10,PACA_IRQ_HARD_DIS - stb r10,PACAIRQHAPPENED(r13) addi r3,r1,STACK_FRAME_OVERHEAD bl system_reset_exception @@ -1039,14 +1025,6 @@ EXC_COMMON_BEGIN(system_reset_common) subi r10,r10,1 sth r10,PACA_IN_NMI(r13) - /* - * Restore soft mask settings. - */ - ld r10,RESULT(r1) - stb r10,PACAIRQHAPPENED(r13) - ld r10,SOFTE(r1) - stb r10,PACAIRQSOFTMASK(r13) - kuap_restore_amr r9, r10 EXCEPTION_RESTORE_REGS RFI_TO_USER_OR_KERNEL @@ -1192,30 +1170,11 @@ END_FTR_SECTION_IFSET(CPU_FTR_HVMODE) li r10,MSR_RI mtmsrd r10,1 - /* - * Set IRQS_ALL_DISABLED and save PACAIRQHAPPENED (see - * system_reset_common) - */ - li r10,IRQS_ALL_DISABLED - stb r10,PACAIRQSOFTMASK(r13) - lbz r10,PACAIRQHAPPENED(r13) - std r10,RESULT(r1) - ori r10,r10,PACA_IRQ_HARD_DIS - stb r10,PACAIRQHAPPENED(r13) - addi r3,r1,STACK_FRAME_OVERHEAD bl machine_check_early std r3,RESULT(r1) /* Save result */ ld r12,_MSR(r1) - /* - * Restore soft mask settings. - */ - ld r10,RESULT(r1) - stb r10,PACAIRQHAPPENED(r13) - ld r10,SOFTE(r1) - stb r10,PACAIRQSOFTMASK(r13) - #ifdef CONFIG_PPC_P7_NAP /* * Check if thread was in power saving mode. We come here when any @@ -2814,17 +2773,6 @@ EXC_COMMON_BEGIN(soft_nmi_common) subi r1,r1,INT_FRAME_SIZE __GEN_COMMON_BODY soft_nmi - /* - * Set IRQS_ALL_DISABLED and save PACAIRQHAPPENED (see - * system_reset_common) - */ - li r10,IRQS_ALL_DISABLED - stb r10,PACAIRQSOFTMASK(r13) - lbz r10,PACAIRQHAPPENED(r13) - std r10,RESULT(r1) - ori r10,r10,PACA_IRQ_HARD_DIS - stb r10,PACAIRQHAPPENED(r13) - addi r3,r1,STACK_FRAME_OVERHEAD bl soft_nmi_interrupt @@ -2832,14 +2780,6 @@ EXC_COMMON_BEGIN(soft_nmi_common) li r9,0 mtmsrd r9,1 - /* - * Restore soft mask settings. - */ - ld r10,RESULT(r1) - stb r10,PACAIRQHAPPENED(r13) - ld r10,SOFTE(r1) - stb r10,PACAIRQSOFTMASK(r13) - kuap_restore_amr r9, r10 EXCEPTION_RESTORE_REGS hsrr=0 RFI_TO_KERNEL -- 2.23.0