From: Nicholas Piggin <npiggin@gmail.com>
To: linuxppc-dev@lists.ozlabs.org
Cc: Nicholas Piggin <npiggin@gmail.com>
Subject: [PATCH v5 07/21] powerpc: add interrupt wrapper entry / exit stub functions
Date: Wed, 13 Jan 2021 17:32:01 +1000 [thread overview]
Message-ID: <20210113073215.516986-8-npiggin@gmail.com> (raw)
In-Reply-To: <20210113073215.516986-1-npiggin@gmail.com>
These will be used by subsequent patches.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---
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 <linux/context_tracking.h>
#include <asm/ftrace.h>
+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
next prev parent reply other threads:[~2021-01-13 7:51 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-13 7:31 [PATCH v5 00/21] powerpc: interrupt wrappers Nicholas Piggin
2021-01-13 7:31 ` [PATCH v5 01/21] powerpc/32s: Do DABR match out of handle_page_fault() Nicholas Piggin
2021-01-13 7:31 ` [PATCH v5 02/21] powerpc/64s: move the last of the page fault handling logic to C Nicholas Piggin
2021-01-13 14:12 ` Christophe Leroy
2021-01-14 3:24 ` Nicholas Piggin
2021-01-14 12:09 ` Nicholas Piggin
2021-01-14 12:25 ` Christophe Leroy
2021-01-14 13:17 ` Nicholas Piggin
2021-01-14 13:28 ` Christophe Leroy
2021-01-15 0:25 ` Nicholas Piggin
2021-01-13 7:31 ` [PATCH v5 03/21] powerpc: remove arguments from fault handler functions Nicholas Piggin
2021-01-14 14:12 ` Christophe Leroy
2021-01-13 7:31 ` [PATCH v5 04/21] powerpc: bad_page_fault, do_break get registers from regs Nicholas Piggin
2021-01-13 14:25 ` Christophe Leroy
2021-01-14 3:26 ` Nicholas Piggin
2021-01-13 7:31 ` [PATCH v5 05/21] powerpc/perf: move perf irq/nmi handling details into traps.c Nicholas Piggin
2021-01-13 7:32 ` [PATCH v5 06/21] powerpc: interrupt handler wrapper functions Nicholas Piggin
2021-01-13 14:45 ` Christophe Leroy
2021-01-14 3:41 ` Nicholas Piggin
2021-01-13 7:32 ` Nicholas Piggin [this message]
2021-01-13 7:32 ` [PATCH v5 08/21] powerpc: add interrupt_cond_local_irq_enable helper Nicholas Piggin
2021-01-13 7:32 ` [PATCH v5 09/21] powerpc/64: context tracking remove _TIF_NOHZ Nicholas Piggin
2021-01-13 14:50 ` Christophe Leroy
2021-01-14 3:48 ` Nicholas Piggin
2021-01-13 7:32 ` [PATCH v5 10/21] powerpc/64s/hash: improve context tracking of hash faults Nicholas Piggin
2021-01-13 7:32 ` [PATCH v5 11/21] powerpc/64: context tracking move to interrupt wrappers Nicholas Piggin
2021-01-13 7:32 ` [PATCH v5 12/21] powerpc/64: add context tracking to asynchronous interrupts Nicholas Piggin
2021-01-13 7:32 ` [PATCH v5 13/21] powerpc: handle irq_enter/irq_exit in interrupt handler wrappers Nicholas Piggin
2021-01-13 7:32 ` [PATCH v5 14/21] powerpc/64s: move context tracking exit to interrupt exit path Nicholas Piggin
2021-01-13 7:32 ` [PATCH v5 15/21] powerpc/64s: reconcile interrupts in C Nicholas Piggin
2021-01-13 14:54 ` Christophe Leroy
2021-01-14 3:51 ` Nicholas Piggin
2021-01-13 7:32 ` [PATCH v5 16/21] powerpc/64: move account_stolen_time into its own function Nicholas Piggin
2021-01-13 14:59 ` Christophe Leroy
2021-01-14 3:51 ` Nicholas Piggin
2021-01-13 7:32 ` [PATCH v5 17/21] powerpc/64: entry cpu time accounting in C Nicholas Piggin
2021-01-13 15:05 ` Christophe Leroy
2021-01-14 3:58 ` Nicholas Piggin
2021-01-13 7:32 ` [PATCH v5 18/21] powerpc: move NMI entry/exit code into wrapper Nicholas Piggin
2021-01-13 15:13 ` Christophe Leroy
2021-01-14 4:00 ` Nicholas Piggin
2021-01-13 7:32 ` [PATCH v5 19/21] powerpc/64s: move NMI soft-mask handling to C Nicholas Piggin
2021-01-13 7:32 ` [PATCH v5 20/21] powerpc/64s: runlatch interrupt handling in C Nicholas Piggin
2021-01-13 7:32 ` [PATCH v5 21/21] powerpc/64s: power4 nap fixup " Nicholas Piggin
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