forked from mirrors/linux
de30a2b355
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>
96 lines
3.2 KiB
C
96 lines
3.2 KiB
C
/*
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* include/linux/irqflags.h
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*
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* IRQ flags tracing: follow the state of the hardirq and softirq flags and
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* provide callbacks for transitions between ON and OFF states.
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*
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* This file gets included from lowlevel asm headers too, to provide
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* wrapped versions of the local_irq_*() APIs, based on the
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* raw_local_irq_*() macros from the lowlevel headers.
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*/
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#ifndef _LINUX_TRACE_IRQFLAGS_H
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#define _LINUX_TRACE_IRQFLAGS_H
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#ifdef CONFIG_TRACE_IRQFLAGS
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extern void trace_hardirqs_on(void);
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extern void trace_hardirqs_off(void);
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extern void trace_softirqs_on(unsigned long ip);
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extern void trace_softirqs_off(unsigned long ip);
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# define trace_hardirq_context(p) ((p)->hardirq_context)
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# define trace_softirq_context(p) ((p)->softirq_context)
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# define trace_hardirqs_enabled(p) ((p)->hardirqs_enabled)
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# define trace_softirqs_enabled(p) ((p)->softirqs_enabled)
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# define trace_hardirq_enter() do { current->hardirq_context++; } while (0)
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# define trace_hardirq_exit() do { current->hardirq_context--; } while (0)
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# define trace_softirq_enter() do { current->softirq_context++; } while (0)
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# define trace_softirq_exit() do { current->softirq_context--; } while (0)
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# define INIT_TRACE_IRQFLAGS .softirqs_enabled = 1,
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#else
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# define trace_hardirqs_on() do { } while (0)
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# define trace_hardirqs_off() do { } while (0)
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# define trace_softirqs_on(ip) do { } while (0)
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# define trace_softirqs_off(ip) do { } while (0)
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# define trace_hardirq_context(p) 0
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# define trace_softirq_context(p) 0
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# define trace_hardirqs_enabled(p) 0
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# define trace_softirqs_enabled(p) 0
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# define trace_hardirq_enter() do { } while (0)
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# define trace_hardirq_exit() do { } while (0)
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# define trace_softirq_enter() do { } while (0)
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# define trace_softirq_exit() do { } while (0)
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# define INIT_TRACE_IRQFLAGS
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#endif
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#ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT
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#include <asm/irqflags.h>
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#define local_irq_enable() \
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do { trace_hardirqs_on(); raw_local_irq_enable(); } while (0)
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#define local_irq_disable() \
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do { raw_local_irq_disable(); trace_hardirqs_off(); } while (0)
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#define local_irq_save(flags) \
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do { raw_local_irq_save(flags); trace_hardirqs_off(); } while (0)
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#define local_irq_restore(flags) \
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do { \
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if (raw_irqs_disabled_flags(flags)) { \
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raw_local_irq_restore(flags); \
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trace_hardirqs_off(); \
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} else { \
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trace_hardirqs_on(); \
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raw_local_irq_restore(flags); \
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} \
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} while (0)
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#else /* !CONFIG_TRACE_IRQFLAGS_SUPPORT */
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/*
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* The local_irq_*() APIs are equal to the raw_local_irq*()
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* if !TRACE_IRQFLAGS.
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*/
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# define raw_local_irq_disable() local_irq_disable()
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# define raw_local_irq_enable() local_irq_enable()
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# define raw_local_irq_save(flags) local_irq_save(flags)
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# define raw_local_irq_restore(flags) local_irq_restore(flags)
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#endif /* CONFIG_TRACE_IRQFLAGS_SUPPORT */
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#ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT
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#define safe_halt() \
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do { \
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trace_hardirqs_on(); \
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raw_safe_halt(); \
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} while (0)
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#define local_save_flags(flags) raw_local_save_flags(flags)
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#define irqs_disabled() \
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({ \
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unsigned long flags; \
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\
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raw_local_save_flags(flags); \
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raw_irqs_disabled_flags(flags); \
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})
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#define irqs_disabled_flags(flags) raw_irqs_disabled_flags(flags)
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#endif /* CONFIG_X86 */
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#endif
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