[ARM] Add ARM irqtrace support

This adds support for irqtrace for lockdep on ARM.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/Kconfig

@@ -51,6 +51,10 @@ config GENERIC_HARDIRQS
 	bool
 	default y
 
+config TRACE_IRQFLAGS_SUPPORT
+	bool
+	default y
+
 config HARDIRQS_SW_RESEND
 	bool
 	default y

arch/arm/kernel/entry-armv.S

@@ -191,6 +191,9 @@ __dabt_svc:
 __irq_svc:
 	svc_entry
 
+#ifdef CONFIG_TRACE_IRQFLAGS
+	bl	trace_hardirqs_off
+#endif
 #ifdef CONFIG_PREEMPT
 	get_thread_info tsk
 	ldr	r8, [tsk, #TI_PREEMPT]		@ get preempt count
@@ -211,6 +214,10 @@ preempt_return:
 #endif
 	ldr	r0, [sp, #S_PSR]		@ irqs are already disabled
 	msr	spsr_cxsf, r0
+#ifdef CONFIG_TRACE_IRQFLAGS
+	tst	r0, #PSR_I_BIT
+	bleq	trace_hardirqs_on
+#endif
 	ldmia	sp, {r0 - pc}^			@ load r0 - pc, cpsr
 
 	.ltorg
@@ -398,6 +405,9 @@ __dabt_usr:
 __irq_usr:
 	usr_entry
 
+#ifdef CONFIG_TRACE_IRQFLAGS
+	bl	trace_hardirqs_off
+#endif
 	get_thread_info tsk
 #ifdef CONFIG_PREEMPT
 	ldr	r8, [tsk, #TI_PREEMPT]		@ get preempt count
@@ -412,6 +422,9 @@ __irq_usr:
 	teq	r0, r7
 	strne	r0, [r0, -r0]
 #endif
+#ifdef CONFIG_TRACE_IRQFLAGS
+	bl	trace_hardirqs_on
+#endif
 
 	mov	why, #0
 	b	ret_to_user

include/asm-arm/irqflags.h

@@ -0,0 +1,132 @@
+#ifndef __ASM_ARM_IRQFLAGS_H
+#define __ASM_ARM_IRQFLAGS_H
+
+#ifdef __KERNEL__
+
+#include <asm/ptrace.h>
+
+/*
+ * CPU interrupt mask handling.
+ */
+#if __LINUX_ARM_ARCH__ >= 6
+
+#define raw_local_irq_save(x)					\
+	({							\
+	__asm__ __volatile__(					\
+	"mrs	%0, cpsr		@ local_irq_save\n"	\
+	"cpsid	i"						\
+	: "=r" (x) : : "memory", "cc");				\
+	})
+
+#define raw_local_irq_enable()  __asm__("cpsie i	@ __sti" : : : "memory", "cc")
+#define raw_local_irq_disable() __asm__("cpsid i	@ __cli" : : : "memory", "cc")
+#define local_fiq_enable()  __asm__("cpsie f	@ __stf" : : : "memory", "cc")
+#define local_fiq_disable() __asm__("cpsid f	@ __clf" : : : "memory", "cc")
+
+#else
+
+/*
+ * Save the current interrupt enable state & disable IRQs
+ */
+#define raw_local_irq_save(x)					\
+	({							\
+		unsigned long temp;				\
+		(void) (&temp == &x);				\
+	__asm__ __volatile__(					\
+	"mrs	%0, cpsr		@ local_irq_save\n"	\
+"	orr	%1, %0, #128\n"					\
+"	msr	cpsr_c, %1"					\
+	: "=r" (x), "=r" (temp)					\
+	:							\
+	: "memory", "cc");					\
+	})
+	
+/*
+ * Enable IRQs
+ */
+#define raw_local_irq_enable()					\
+	({							\
+		unsigned long temp;				\
+	__asm__ __volatile__(					\
+	"mrs	%0, cpsr		@ local_irq_enable\n"	\
+"	bic	%0, %0, #128\n"					\
+"	msr	cpsr_c, %0"					\
+	: "=r" (temp)						\
+	:							\
+	: "memory", "cc");					\
+	})
+
+/*
+ * Disable IRQs
+ */
+#define raw_local_irq_disable()					\
+	({							\
+		unsigned long temp;				\
+	__asm__ __volatile__(					\
+	"mrs	%0, cpsr		@ local_irq_disable\n"	\
+"	orr	%0, %0, #128\n"					\
+"	msr	cpsr_c, %0"					\
+	: "=r" (temp)						\
+	:							\
+	: "memory", "cc");					\
+	})
+
+/*
+ * Enable FIQs
+ */
+#define local_fiq_enable()					\
+	({							\
+		unsigned long temp;				\
+	__asm__ __volatile__(					\
+	"mrs	%0, cpsr		@ stf\n"		\
+"	bic	%0, %0, #64\n"					\
+"	msr	cpsr_c, %0"					\
+	: "=r" (temp)						\
+	:							\
+	: "memory", "cc");					\
+	})
+
+/*
+ * Disable FIQs
+ */
+#define local_fiq_disable()					\
+	({							\
+		unsigned long temp;				\
+	__asm__ __volatile__(					\
+	"mrs	%0, cpsr		@ clf\n"		\
+"	orr	%0, %0, #64\n"					\
+"	msr	cpsr_c, %0"					\
+	: "=r" (temp)						\
+	:							\
+	: "memory", "cc");					\
+	})
+
+#endif
+
+/*
+ * Save the current interrupt enable state.
+ */
+#define raw_local_save_flags(x)					\
+	({							\
+	__asm__ __volatile__(					\
+	"mrs	%0, cpsr		@ local_save_flags"	\
+	: "=r" (x) : : "memory", "cc");				\
+	})
+
+/*
+ * restore saved IRQ & FIQ state
+ */
+#define raw_local_irq_restore(x)				\
+	__asm__ __volatile__(					\
+	"msr	cpsr_c, %0		@ local_irq_restore\n"	\
+	:							\
+	: "r" (x)						\
+	: "memory", "cc")
+
+#define raw_irqs_disabled_flags(flags)	\
+({					\
+	(int)((flags) & PSR_I_BIT);	\
+})
+
+#endif
+#endif

include/asm-arm/system.h

@@ -207,130 +207,7 @@ static inline void sched_cacheflush(void)
 {
 }
 
-/*
- * CPU interrupt mask handling.
- */
-#if __LINUX_ARM_ARCH__ >= 6
-
-#define local_irq_save(x)					\
-	({							\
-	__asm__ __volatile__(					\
-	"mrs	%0, cpsr		@ local_irq_save\n"	\
-	"cpsid	i"						\
-	: "=r" (x) : : "memory", "cc");				\
-	})
-
-#define local_irq_enable()  __asm__("cpsie i	@ __sti" : : : "memory", "cc")
-#define local_irq_disable() __asm__("cpsid i	@ __cli" : : : "memory", "cc")
-#define local_fiq_enable()  __asm__("cpsie f	@ __stf" : : : "memory", "cc")
-#define local_fiq_disable() __asm__("cpsid f	@ __clf" : : : "memory", "cc")
-
-#else
-
-/*
- * Save the current interrupt enable state & disable IRQs
- */
-#define local_irq_save(x)					\
-	({							\
-		unsigned long temp;				\
-		(void) (&temp == &x);				\
-	__asm__ __volatile__(					\
-	"mrs	%0, cpsr		@ local_irq_save\n"	\
-"	orr	%1, %0, #128\n"					\
-"	msr	cpsr_c, %1"					\
-	: "=r" (x), "=r" (temp)					\
-	:							\
-	: "memory", "cc");					\
-	})
-	
-/*
- * Enable IRQs
- */
-#define local_irq_enable()					\
-	({							\
-		unsigned long temp;				\
-	__asm__ __volatile__(					\
-	"mrs	%0, cpsr		@ local_irq_enable\n"	\
-"	bic	%0, %0, #128\n"					\
-"	msr	cpsr_c, %0"					\
-	: "=r" (temp)						\
-	:							\
-	: "memory", "cc");					\
-	})
-
-/*
- * Disable IRQs
- */
-#define local_irq_disable()					\
-	({							\
-		unsigned long temp;				\
-	__asm__ __volatile__(					\
-	"mrs	%0, cpsr		@ local_irq_disable\n"	\
-"	orr	%0, %0, #128\n"					\
-"	msr	cpsr_c, %0"					\
-	: "=r" (temp)						\
-	:							\
-	: "memory", "cc");					\
-	})
-
-/*
- * Enable FIQs
- */
-#define local_fiq_enable()					\
-	({							\
-		unsigned long temp;				\
-	__asm__ __volatile__(					\
-	"mrs	%0, cpsr		@ stf\n"		\
-"	bic	%0, %0, #64\n"					\
-"	msr	cpsr_c, %0"					\
-	: "=r" (temp)						\
-	:							\
-	: "memory", "cc");					\
-	})
-
-/*
- * Disable FIQs
- */
-#define local_fiq_disable()					\
-	({							\
-		unsigned long temp;				\
-	__asm__ __volatile__(					\
-	"mrs	%0, cpsr		@ clf\n"		\
-"	orr	%0, %0, #64\n"					\
-"	msr	cpsr_c, %0"					\
-	: "=r" (temp)						\
-	:							\
-	: "memory", "cc");					\
-	})
-
-#endif
-
-/*
- * Save the current interrupt enable state.
- */
-#define local_save_flags(x)					\
-	({							\
-	__asm__ __volatile__(					\
-	"mrs	%0, cpsr		@ local_save_flags"	\
-	: "=r" (x) : : "memory", "cc");				\
-	})
-
-/*
- * restore saved IRQ & FIQ state
- */
-#define local_irq_restore(x)					\
-	__asm__ __volatile__(					\
-	"msr	cpsr_c, %0		@ local_irq_restore\n"	\
-	:							\
-	: "r" (x)						\
-	: "memory", "cc")
-
-#define irqs_disabled()			\
-({					\
-	unsigned long flags;		\
-	local_save_flags(flags);	\
-	(int)(flags & PSR_I_BIT);	\
-})
+#include <linux/irqflags.h>
 
 #ifdef CONFIG_SMP