linux-kernel - [patch 03/15] x86/entry: Add IRQENTRY

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Message-Id: <20200225231609.216265343@linutronix.de>
Date:   Tue, 25 Feb 2020 23:47:22 +0100
From:   Thomas Gleixner <tglx@...utronix.de>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     x86@...nel.org, Steven Rostedt <rostedt@...dmis.org>,
        Brian Gerst <brgerst@...il.com>,
        Juergen Gross <jgross@...e.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Arnd Bergmann <arnd@...db.de>
Subject: [patch 03/15] x86/entry: Add IRQENTRY_IRQ macro

Provide a seperate IDTENTRY macro for device interrupts, which supports the
interrupt stack switch mode on 64 bit. Otherwise its the same as
IDTENTRY_ERRORCODE.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
 arch/x86/include/asm/idtentry.h |   44 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 44 insertions(+)

--- a/arch/x86/include/asm/idtentry.h
+++ b/arch/x86/include/asm/idtentry.h
@@ -171,6 +171,46 @@ static __always_inline void __##func(str
 				     unsigned long error_code,		\
 				     unsigned long address)
 
+/**
+ * DECLARE_IDTENTRY_IRQ - Declare functions for device interrupt IDT entry
+ *			  points (common/spurious)
+ * @vector:	Vector number (ignored for C)
+ * @func:	Function name of the entry point
+ *
+ * Declares three functions:
+ * - The ASM entry point: asm_##func
+ * - The XEN PV trap entry point: xen_##func (maybe unused)
+ * - The C handler called from the ASM entry point
+ */
+#define DECLARE_IDTENTRY_IRQ(vector, func)				\
+	asmlinkage void asm_##func(void);				\
+	asmlinkage void xen_asm_##func(void);				\
+	__visible void func(struct pt_regs *regs, unsigned long vector)
+
+/**
+ * DEFINE_IDTENTRY_IRQ - Emit code for device interrupt IDT entry points
+ * @func:	Function name of the entry point
+ *
+ * @func is called from ASM entry code with interrupts disabled.
+ *
+ * Used for C handlers which require the vector number.
+ */
+#define DEFINE_IDTENTRY_IRQ(func)					\
+static __always_inline void __##func(struct pt_regs *regs,		\
+				     unsigned long vector);		\
+									\
+__visible notrace __irq_entry void func(struct pt_regs *regs,		\
+					unsigned long vector)		\
+{									\
+	idtentry_enter(regs);						\
+	__##func (regs, vector);					\
+	idtentry_exit(regs);						\
+}									\
+NOKPROBE_SYMBOL(func);							\
+									\
+static __always_inline void __##func(struct pt_regs *regs,		\
+				     unsigned long vector)
+
 #ifdef CONFIG_X86_64
 /**
  * DECLARE_IDTENTRY_IST - Declare functions for IST handling IDT entry points
@@ -340,6 +380,10 @@ static __always_inline void __##func(str
 /* Special case for 32bit IRET 'trap'. Do not emit ASM code */
 #define DECLARE_IDTENTRY_SW(vector, func)
 
+/* Entries for common/spurious (device) interrupts */
+#define DECLARE_IDTENTRY_IRQ(vector, func)			\
+	idtentry_irq vector func
+
 #ifdef CONFIG_X86_64
 # define DECLARE_IDTENTRY_MCE(vector, func)			\
 	idtentry_mce_db vector asm_##func func