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[193.116.97.30]) by smtp.gmail.com with ESMTPSA id h4sm58501413pgp.8.2021.01.02.04.25.35 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 02 Jan 2021 04:25:37 -0800 (PST) From: Nicholas Piggin To: linuxppc-dev@lists.ozlabs.org Subject: [PATCH v4 07/21] powerpc: add interrupt wrapper entry / exit stub functions Date: Sat, 2 Jan 2021 22:24:54 +1000 Message-Id: <20210102122508.1950592-8-npiggin@gmail.com> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20210102122508.1950592-1-npiggin@gmail.com> References: <20210102122508.1950592-1-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: Nicholas Piggin Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" These will be used by subsequent patches. Signed-off-by: Nicholas Piggin --- arch/powerpc/include/asm/interrupt.h | 66 ++++++++++++++++++++++++++++ 1 file changed, 66 insertions(+) diff --git a/arch/powerpc/include/asm/interrupt.h b/arch/powerpc/include/asm/interrupt.h index 60363e5eeffa..7c72c91c21ce 100644 --- a/arch/powerpc/include/asm/interrupt.h +++ b/arch/powerpc/include/asm/interrupt.h @@ -5,6 +5,50 @@ #include #include +struct interrupt_state { +}; + +static inline void interrupt_enter_prepare(struct pt_regs *regs, struct interrupt_state *state) +{ +} + +/* + * 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) +{ +} + +static inline void interrupt_async_enter_prepare(struct pt_regs *regs, struct interrupt_state *state) +{ +} + +static inline void interrupt_async_exit_prepare(struct pt_regs *regs, struct interrupt_state *state) +{ +} + +struct interrupt_nmi_state { +}; + +static inline void interrupt_nmi_enter_prepare(struct pt_regs *regs, struct interrupt_nmi_state *state) +{ +} + +static inline void interrupt_nmi_exit_prepare(struct pt_regs *regs, struct interrupt_nmi_state *state) +{ +} + /** * DECLARE_INTERRUPT_HANDLER_RAW - Declare raw interrupt handler function * @func: Function name of the entry point @@ -71,7 +115,13 @@ static __always_inline void ____##func(struct pt_regs *regs); \ \ __visible noinstr void func(struct pt_regs *regs) \ { \ + struct interrupt_state state; \ + \ + interrupt_enter_prepare(regs, &state); \ + \ ____##func (regs); \ + \ + interrupt_exit_prepare(regs, &state); \ } \ \ static __always_inline void ____##func(struct pt_regs *regs) @@ -99,10 +149,15 @@ static __always_inline long ____##func(struct pt_regs *regs); \ \ __visible noinstr 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; \ } \ \ @@ -129,7 +184,13 @@ static __always_inline void ____##func(struct pt_regs *regs); \ \ __visible noinstr void func(struct pt_regs *regs) \ { \ + struct interrupt_state state; \ + \ + interrupt_async_enter_prepare(regs, &state); \ + \ ____##func (regs); \ + \ + interrupt_async_exit_prepare(regs, &state); \ } \ \ static __always_inline void ____##func(struct pt_regs *regs) @@ -157,10 +218,15 @@ static __always_inline long ____##func(struct pt_regs *regs); \ \ __visible noinstr 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; \ } \ \ -- 2.23.0