1 /* 2 * include/linux/irqflags.h 3 * 4 * IRQ flags tracing: follow the state of the hardirq and softirq flags and 5 * provide callbacks for transitions between ON and OFF states. 6 * 7 * This file gets included from lowlevel asm headers too, to provide 8 * wrapped versions of the local_irq_*() APIs, based on the 9 * raw_local_irq_*() macros from the lowlevel headers. 10 */ 11 #ifndef _LINUX_TRACE_IRQFLAGS_H 12 #define _LINUX_TRACE_IRQFLAGS_H 13 14 #ifdef CONFIG_TRACE_IRQFLAGS 15 extern void trace_hardirqs_on(void); 16 extern void trace_hardirqs_off(void); 17 extern void trace_softirqs_on(unsigned long ip); 18 extern void trace_softirqs_off(unsigned long ip); 19 # define trace_hardirq_context(p) ((p)->hardirq_context) 20 # define trace_softirq_context(p) ((p)->softirq_context) 21 # define trace_hardirqs_enabled(p) ((p)->hardirqs_enabled) 22 # define trace_softirqs_enabled(p) ((p)->softirqs_enabled) 23 # define trace_hardirq_enter() do { current->hardirq_context++; } while (0) 24 # define trace_hardirq_exit() do { current->hardirq_context--; } while (0) 25 # define trace_softirq_enter() do { current->softirq_context++; } while (0) 26 # define trace_softirq_exit() do { current->softirq_context--; } while (0) 27 # define INIT_TRACE_IRQFLAGS .softirqs_enabled = 1, 28 #else 29 # define trace_hardirqs_on() do { } while (0) 30 # define trace_hardirqs_off() do { } while (0) 31 # define trace_softirqs_on(ip) do { } while (0) 32 # define trace_softirqs_off(ip) do { } while (0) 33 # define trace_hardirq_context(p) 0 34 # define trace_softirq_context(p) 0 35 # define trace_hardirqs_enabled(p) 0 36 # define trace_softirqs_enabled(p) 0 37 # define trace_hardirq_enter() do { } while (0) 38 # define trace_hardirq_exit() do { } while (0) 39 # define trace_softirq_enter() do { } while (0) 40 # define trace_softirq_exit() do { } while (0) 41 # define INIT_TRACE_IRQFLAGS 42 #endif 43 44 #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT 45 46 #include <asm/irqflags.h> 47 48 #define local_irq_enable() \ 49 do { trace_hardirqs_on(); raw_local_irq_enable(); } while (0) 50 #define local_irq_disable() \ 51 do { raw_local_irq_disable(); trace_hardirqs_off(); } while (0) 52 #define local_irq_save(flags) \ 53 do { raw_local_irq_save(flags); trace_hardirqs_off(); } while (0) 54 55 #define local_irq_restore(flags) \ 56 do { \ 57 if (raw_irqs_disabled_flags(flags)) { \ 58 raw_local_irq_restore(flags); \ 59 trace_hardirqs_off(); \ 60 } else { \ 61 trace_hardirqs_on(); \ 62 raw_local_irq_restore(flags); \ 63 } \ 64 } while (0) 65 #else /* !CONFIG_TRACE_IRQFLAGS_SUPPORT */ 66 /* 67 * The local_irq_*() APIs are equal to the raw_local_irq*() 68 * if !TRACE_IRQFLAGS. 69 */ 70 # define raw_local_irq_disable() local_irq_disable() 71 # define raw_local_irq_enable() local_irq_enable() 72 # define raw_local_irq_save(flags) local_irq_save(flags) 73 # define raw_local_irq_restore(flags) local_irq_restore(flags) 74 #endif /* CONFIG_TRACE_IRQFLAGS_SUPPORT */ 75 76 #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT 77 #define safe_halt() \ 78 do { \ 79 trace_hardirqs_on(); \ 80 raw_safe_halt(); \ 81 } while (0) 82 83 #define local_save_flags(flags) raw_local_save_flags(flags) 84 85 #define irqs_disabled() \ 86 ({ \ 87 unsigned long flags; \ 88 \ 89 raw_local_save_flags(flags); \ 90 raw_irqs_disabled_flags(flags); \ 91 }) 92 93 #define irqs_disabled_flags(flags) raw_irqs_disabled_flags(flags) 94 #endif /* CONFIG_X86 */ 95 96 #endif 97
