[PATCH v4 4/9] arm64: stacktrace: move SDEI stack helpers to stacktrace code

[Mark Rutland]

For clarity and ease of maintenance, it would be helpful for all the
stack helpers to be in the same place.

Move the SDEI stack helpers into the stacktrace code where all the other
stack helpers live.

There should be no functional change as a result of this patch.

Signed-off-by: Mark Rutland <mark.rutland at arm.com>
Reviewed-by: Kalesh Singh <kaleshsingh at google.com>
Reviewed-by: Madhavan T. Venkataraman <madvenka at linux.microsoft.com>
Reviewed-by: Mark Brown <broonie at kernel.org>
Cc: Catalin Marinas <catalin.marinas at arm.com>
Cc: Fuad Tabba <tabba at google.com>
Cc: James Morse <james.morse at arm.com>
Cc: Marc Zyngier <maz at kernel.org>
Cc: Will Deacon <will at kernel.org>
---
 arch/arm64/include/asm/sdei.h       | 17 ------------
 arch/arm64/include/asm/stacktrace.h | 40 ++++++++++++++++++++++++++++-
 arch/arm64/kernel/sdei.c            | 32 -----------------------
 arch/arm64/kernel/stacktrace.c      | 11 ++++++--
 4 files changed, 48 insertions(+), 52 deletions(-)

diff --git a/arch/arm64/include/asm/sdei.h b/arch/arm64/include/asm/sdei.h
index 7bea1d705dd64..4292d9bafb9d2 100644
--- a/arch/arm64/include/asm/sdei.h
+++ b/arch/arm64/include/asm/sdei.h
@@ -43,22 +43,5 @@ unsigned long do_sdei_event(struct pt_regs *regs,
 unsigned long sdei_arch_get_entry_point(int conduit);
 #define sdei_arch_get_entry_point(x)	sdei_arch_get_entry_point(x)
 
-struct stack_info;
-
-bool _on_sdei_stack(unsigned long sp, unsigned long size,
-		    struct stack_info *info);
-static inline bool on_sdei_stack(unsigned long sp, unsigned long size,
-				struct stack_info *info)
-{
-	if (!IS_ENABLED(CONFIG_VMAP_STACK))
-		return false;
-	if (!IS_ENABLED(CONFIG_ARM_SDE_INTERFACE))
-		return false;
-	if (in_nmi())
-		return _on_sdei_stack(sp, size, info);
-
-	return false;
-}
-
 #endif /* __ASSEMBLY__ */
 #endif	/* __ASM_SDEI_H */
diff --git a/arch/arm64/include/asm/stacktrace.h b/arch/arm64/include/asm/stacktrace.h
index 6ebdcdff77f56..fa2df1ea22ebc 100644
--- a/arch/arm64/include/asm/stacktrace.h
+++ b/arch/arm64/include/asm/stacktrace.h
@@ -54,7 +54,45 @@ static inline bool on_overflow_stack(unsigned long sp, unsigned long size,
 }
 #else
 static inline bool on_overflow_stack(unsigned long sp, unsigned long size,
-			struct stack_info *info) { return false; }
+				     struct stack_info *info)
+{
+	return false;
+}
+#endif
+
+#if defined(CONFIG_ARM_SDE_INTERFACE) && defined(CONFIG_VMAP_STACK)
+DECLARE_PER_CPU(unsigned long *, sdei_stack_normal_ptr);
+DECLARE_PER_CPU(unsigned long *, sdei_stack_critical_ptr);
+
+static inline bool on_sdei_normal_stack(unsigned long sp, unsigned long size,
+					struct stack_info *info)
+{
+	unsigned long low = (unsigned long)raw_cpu_read(sdei_stack_normal_ptr);
+	unsigned long high = low + SDEI_STACK_SIZE;
+
+	return on_stack(sp, size, low, high, STACK_TYPE_SDEI_NORMAL, info);
+}
+
+static inline bool on_sdei_critical_stack(unsigned long sp, unsigned long size,
+					  struct stack_info *info)
+{
+	unsigned long low = (unsigned long)raw_cpu_read(sdei_stack_critical_ptr);
+	unsigned long high = low + SDEI_STACK_SIZE;
+
+	return on_stack(sp, size, low, high, STACK_TYPE_SDEI_CRITICAL, info);
+}
+#else
+static inline bool on_sdei_normal_stack(unsigned long sp, unsigned long size,
+					struct stack_info *info)
+{
+	return false;
+}
+
+static inline bool on_sdei_critical_stack(unsigned long sp, unsigned long size,
+					  struct stack_info *info)
+{
+	return false;
+}
 #endif
 
 #endif	/* __ASM_STACKTRACE_H */
diff --git a/arch/arm64/kernel/sdei.c b/arch/arm64/kernel/sdei.c
index d20620a1c51a4..d56e170e1ca7c 100644
--- a/arch/arm64/kernel/sdei.c
+++ b/arch/arm64/kernel/sdei.c
@@ -162,38 +162,6 @@ static int init_sdei_scs(void)
 	return err;
 }
 
-static bool on_sdei_normal_stack(unsigned long sp, unsigned long size,
-				 struct stack_info *info)
-{
-	unsigned long low = (unsigned long)raw_cpu_read(sdei_stack_normal_ptr);
-	unsigned long high = low + SDEI_STACK_SIZE;
-
-	return on_stack(sp, size, low, high, STACK_TYPE_SDEI_NORMAL, info);
-}
-
-static bool on_sdei_critical_stack(unsigned long sp, unsigned long size,
-				   struct stack_info *info)
-{
-	unsigned long low = (unsigned long)raw_cpu_read(sdei_stack_critical_ptr);
-	unsigned long high = low + SDEI_STACK_SIZE;
-
-	return on_stack(sp, size, low, high, STACK_TYPE_SDEI_CRITICAL, info);
-}
-
-bool _on_sdei_stack(unsigned long sp, unsigned long size, struct stack_info *info)
-{
-	if (!IS_ENABLED(CONFIG_VMAP_STACK))
-		return false;
-
-	if (on_sdei_critical_stack(sp, size, info))
-		return true;
-
-	if (on_sdei_normal_stack(sp, size, info))
-		return true;
-
-	return false;
-}
-
 unsigned long sdei_arch_get_entry_point(int conduit)
 {
 	/*
diff --git a/arch/arm64/kernel/stacktrace.c b/arch/arm64/kernel/stacktrace.c
index 4c8865e495fea..edf9edca20552 100644
--- a/arch/arm64/kernel/stacktrace.c
+++ b/arch/arm64/kernel/stacktrace.c
@@ -86,8 +86,15 @@ static bool on_accessible_stack(const struct task_struct *tsk,
 		return true;
 	if (on_overflow_stack(sp, size, info))
 		return true;
-	if (on_sdei_stack(sp, size, info))
-		return true;
+
+	if (IS_ENABLED(CONFIG_VMAP_STACK) &&
+	    IS_ENABLED(CONFIG_ARM_SDE_INTERFACE) &&
+	    in_nmi()) {
+		if (on_sdei_critical_stack(sp, size, info))
+			return true;
+		if (on_sdei_normal_stack(sp, size, info))
+			return true;
+	}
 
 	return false;
 }
-- 
2.30.2