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authorIngo Molnar <mingo@elte.hu>2006-07-03 00:24:42 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-07-03 15:27:03 -0700
commitde30a2b355ea85350ca2f58f3b9bf4e5bc007986 (patch)
tree0bef670aff65614b3c78ca13b20307355b8221d5 /include/linux/irqflags.h
parent5bdc9b447c0076f494a56fdcd93ee8c5e78a2afd (diff)
downloadlwn-de30a2b355ea85350ca2f58f3b9bf4e5bc007986.tar.gz
lwn-de30a2b355ea85350ca2f58f3b9bf4e5bc007986.zip
[PATCH] lockdep: irqtrace subsystem, core
Accurate hard-IRQ-flags and softirq-flags state tracing. This allows us to attach extra functionality to IRQ flags on/off events (such as trace-on/off). Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Arjan van de Ven <arjan@linux.intel.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/linux/irqflags.h')
-rw-r--r--include/linux/irqflags.h96
1 files changed, 96 insertions, 0 deletions
diff --git a/include/linux/irqflags.h b/include/linux/irqflags.h
new file mode 100644
index 000000000000..412e025bc5c7
--- /dev/null
+++ b/include/linux/irqflags.h
@@ -0,0 +1,96 @@
+/*
+ * include/linux/irqflags.h
+ *
+ * IRQ flags tracing: follow the state of the hardirq and softirq flags and
+ * provide callbacks for transitions between ON and OFF states.
+ *
+ * This file gets included from lowlevel asm headers too, to provide
+ * wrapped versions of the local_irq_*() APIs, based on the
+ * raw_local_irq_*() macros from the lowlevel headers.
+ */
+#ifndef _LINUX_TRACE_IRQFLAGS_H
+#define _LINUX_TRACE_IRQFLAGS_H
+
+#ifdef CONFIG_TRACE_IRQFLAGS
+ extern void trace_hardirqs_on(void);
+ extern void trace_hardirqs_off(void);
+ extern void trace_softirqs_on(unsigned long ip);
+ extern void trace_softirqs_off(unsigned long ip);
+# define trace_hardirq_context(p) ((p)->hardirq_context)
+# define trace_softirq_context(p) ((p)->softirq_context)
+# define trace_hardirqs_enabled(p) ((p)->hardirqs_enabled)
+# define trace_softirqs_enabled(p) ((p)->softirqs_enabled)
+# define trace_hardirq_enter() do { current->hardirq_context++; } while (0)
+# define trace_hardirq_exit() do { current->hardirq_context--; } while (0)
+# define trace_softirq_enter() do { current->softirq_context++; } while (0)
+# define trace_softirq_exit() do { current->softirq_context--; } while (0)
+# define INIT_TRACE_IRQFLAGS .softirqs_enabled = 1,
+#else
+# define trace_hardirqs_on() do { } while (0)
+# define trace_hardirqs_off() do { } while (0)
+# define trace_softirqs_on(ip) do { } while (0)
+# define trace_softirqs_off(ip) do { } while (0)
+# define trace_hardirq_context(p) 0
+# define trace_softirq_context(p) 0
+# define trace_hardirqs_enabled(p) 0
+# define trace_softirqs_enabled(p) 0
+# define trace_hardirq_enter() do { } while (0)
+# define trace_hardirq_exit() do { } while (0)
+# define trace_softirq_enter() do { } while (0)
+# define trace_softirq_exit() do { } while (0)
+# define INIT_TRACE_IRQFLAGS
+#endif
+
+#ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT
+
+#include <asm/irqflags.h>
+
+#define local_irq_enable() \
+ do { trace_hardirqs_on(); raw_local_irq_enable(); } while (0)
+#define local_irq_disable() \
+ do { raw_local_irq_disable(); trace_hardirqs_off(); } while (0)
+#define local_irq_save(flags) \
+ do { raw_local_irq_save(flags); trace_hardirqs_off(); } while (0)
+
+#define local_irq_restore(flags) \
+ do { \
+ if (raw_irqs_disabled_flags(flags)) { \
+ raw_local_irq_restore(flags); \
+ trace_hardirqs_off(); \
+ } else { \
+ trace_hardirqs_on(); \
+ raw_local_irq_restore(flags); \
+ } \
+ } while (0)
+#else /* !CONFIG_TRACE_IRQFLAGS_SUPPORT */
+/*
+ * The local_irq_*() APIs are equal to the raw_local_irq*()
+ * if !TRACE_IRQFLAGS.
+ */
+# define raw_local_irq_disable() local_irq_disable()
+# define raw_local_irq_enable() local_irq_enable()
+# define raw_local_irq_save(flags) local_irq_save(flags)
+# define raw_local_irq_restore(flags) local_irq_restore(flags)
+#endif /* CONFIG_TRACE_IRQFLAGS_SUPPORT */
+
+#ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT
+#define safe_halt() \
+ do { \
+ trace_hardirqs_on(); \
+ raw_safe_halt(); \
+ } while (0)
+
+#define local_save_flags(flags) raw_local_save_flags(flags)
+
+#define irqs_disabled() \
+({ \
+ unsigned long flags; \
+ \
+ raw_local_save_flags(flags); \
+ raw_irqs_disabled_flags(flags); \
+})
+
+#define irqs_disabled_flags(flags) raw_irqs_disabled_flags(flags)
+#endif /* CONFIG_X86 */
+
+#endif