include/trace/events/irq.h

   1 #undef TRACE_SYSTEM
   2 #define TRACE_SYSTEM irq
   3
   4 #if !defined(_TRACE_IRQ_H) || defined(TRACE_HEADER_MULTI_READ)
   5 #define _TRACE_IRQ_H
   6
   7 #include <linux/tracepoint.h>
   8 #include <linux/interrupt.h>
   9
  10 #define softirq_name(sirq) { sirq##_SOFTIRQ, #sirq }
  11 #define show_softirq_name(val)                          \
  12         __print_symbolic(val,                           \
  13                          softirq_name(HI),              \
  14                          softirq_name(TIMER),           \
  15                          softirq_name(NET_TX),          \
  16                          softirq_name(NET_RX),          \
  17                          softirq_name(BLOCK),           \
  18                          softirq_name(BLOCK_IOPOLL),    \
  19                          softirq_name(TASKLET),         \
  20                          softirq_name(SCHED),           \
  21                          softirq_name(HRTIMER),         \
  22                          softirq_name(RCU))
  23
  24 /**
  25  * irq_handler_entry - called immediately before the irq action handler
  26  * @irq: irq number
  27  * @action: pointer to struct irqaction
  28  *
  29  * The struct irqaction pointed to by @action contains various
  30  * information about the handler, including the device name,
  31  * @action->name, and the device id, @action->dev_id. When used in
  32  * conjunction with the irq_handler_exit tracepoint, we can figure
  33  * out irq handler latencies.
  34  */
  35 TRACE_EVENT(irq_handler_entry,
  36
  37         TP_PROTO(int irq, struct irqaction *action),
  38
  39         TP_ARGS(irq, action),
  40
  41         TP_STRUCT__entry(
  42                 __field(        int,    irq             )
  43                 __string(       name,   action->name    )
  44         ),
  45
  46         TP_fast_assign(
  47                 __entry->irq = irq;
  48                 __assign_str(name, action->name);
  49         ),
  50
  51         TP_printk("irq=%d name=%s", __entry->irq, __get_str(name))
  52 );
  53
  54 /**
  55  * irq_handler_exit - called immediately after the irq action handler returns
  56  * @irq: irq number
  57  * @action: pointer to struct irqaction
  58  * @ret: return value
  59  *
  60  * If the @ret value is set to IRQ_HANDLED, then we know that the corresponding
  61  * @action->handler scuccessully handled this irq. Otherwise, the irq might be
  62  * a shared irq line, or the irq was not handled successfully. Can be used in
  63  * conjunction with the irq_handler_entry to understand irq handler latencies.
  64  */
  65 TRACE_EVENT(irq_handler_exit,
  66
  67         TP_PROTO(int irq, struct irqaction *action, int ret),
  68
  69         TP_ARGS(irq, action, ret),
  70
  71         TP_STRUCT__entry(
  72                 __field(        int,    irq     )
  73                 __field(        int,    ret     )
  74         ),
  75
  76         TP_fast_assign(
  77                 __entry->irq    = irq;
  78                 __entry->ret    = ret;
  79         ),
  80
  81         TP_printk("irq=%d ret=%s",
  82                   __entry->irq, __entry->ret ? "handled" : "unhandled")
  83 );
  84
  85 DECLARE_EVENT_CLASS(softirq,
  86
  87         TP_PROTO(struct softirq_action *h, struct softirq_action *vec),
  88
  89         TP_ARGS(h, vec),
  90
  91         TP_STRUCT__entry(
  92                 __field(        int,    vec                     )
  93         ),
  94
  95         TP_fast_assign(
  96                 __entry->vec = (int)(h - vec);
  97         ),
  98
  99         TP_printk("vec=%d [action=%s]", __entry->vec,
 100                   show_softirq_name(__entry->vec))
 101 );
 102
 103 /**
 104  * softirq_entry - called immediately before the softirq handler
 105  * @h: pointer to struct softirq_action
 106  * @vec: pointer to first struct softirq_action in softirq_vec array
 107  *
 108  * The @h parameter, contains a pointer to the struct softirq_action
 109  * which has a pointer to the action handler that is called. By subtracting
 110  * the @vec pointer from the @h pointer, we can determine the softirq
 111  * number. Also, when used in combination with the softirq_exit tracepoint
 112  * we can determine the softirq latency.
 113  */
 114 DEFINE_EVENT(softirq, softirq_entry,
 115
 116         TP_PROTO(struct softirq_action *h, struct softirq_action *vec),
 117
 118         TP_ARGS(h, vec)
 119 );
 120
 121 /**
 122  * softirq_exit - called immediately after the softirq handler returns
 123  * @h: pointer to struct softirq_action
 124  * @vec: pointer to first struct softirq_action in softirq_vec array
 125  *
 126  * The @h parameter contains a pointer to the struct softirq_action
 127  * that has handled the softirq. By subtracting the @vec pointer from
 128  * the @h pointer, we can determine the softirq number. Also, when used in
 129  * combination with the softirq_entry tracepoint we can determine the softirq
 130  * latency.
 131  */
 132 DEFINE_EVENT(softirq, softirq_exit,
 133
 134         TP_PROTO(struct softirq_action *h, struct softirq_action *vec),
 135
 136         TP_ARGS(h, vec)
 137 );
 138
 139 #endif /*  _TRACE_IRQ_H */
 140
 141 /* This part must be outside protection */
 142 #include <trace/define_trace.h>