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(TASKLET), \
  19                          softirq_name(SCHED),   \
  20                          softirq_name(HRTIMER), \
  21                          softirq_name(RCU))
  22
  23 /**
  24  * irq_handler_entry - called immediately before the irq action handler
  25  * @irq: irq number
  26  * @action: pointer to struct irqaction
  27  *
  28  * The struct irqaction pointed to by @action contains various
  29  * information about the handler, including the device name,
  30  * @action->name, and the device id, @action->dev_id. When used in
  31  * conjunction with the irq_handler_exit tracepoint, we can figure
  32  * out irq handler latencies.
  33  */
  34 TRACE_EVENT(irq_handler_entry,
  35
  36         TP_PROTO(int irq, struct irqaction *action),
  37
  38         TP_ARGS(irq, action),
  39
  40         TP_STRUCT__entry(
  41                 __field(        int,    irq             )
  42                 __string(       name,   action->name    )
  43         ),
  44
  45         TP_fast_assign(
  46                 __entry->irq = irq;
  47                 __assign_str(name, action->name);
  48         ),
  49
  50         TP_printk("irq=%d handler=%s", __entry->irq, __get_str(name))
  51 );
  52
  53 /**
  54  * irq_handler_exit - called immediately after the irq action handler returns
  55  * @irq: irq number
  56  * @action: pointer to struct irqaction
  57  * @ret: return value
  58  *
  59  * If the @ret value is set to IRQ_HANDLED, then we know that the corresponding
  60  * @action->handler scuccessully handled this irq. Otherwise, the irq might be
  61  * a shared irq line, or the irq was not handled successfully. Can be used in
  62  * conjunction with the irq_handler_entry to understand irq handler latencies.
  63  */
  64 TRACE_EVENT(irq_handler_exit,
  65
  66         TP_PROTO(int irq, struct irqaction *action, int ret),
  67
  68         TP_ARGS(irq, action, ret),
  69
  70         TP_STRUCT__entry(
  71                 __field(        int,    irq     )
  72                 __field(        int,    ret     )
  73         ),
  74
  75         TP_fast_assign(
  76                 __entry->irq    = irq;
  77                 __entry->ret    = ret;
  78         ),
  79
  80         TP_printk("irq=%d return=%s",
  81                   __entry->irq, __entry->ret ? "handled" : "unhandled")
  82 );
  83
  84 /**
  85  * softirq_entry - called immediately before the softirq handler
  86  * @h: pointer to struct softirq_action
  87  * @vec: pointer to first struct softirq_action in softirq_vec array
  88  *
  89  * The @h parameter, contains a pointer to the struct softirq_action
  90  * which has a pointer to the action handler that is called. By subtracting
  91  * the @vec pointer from the @h pointer, we can determine the softirq
  92  * number. Also, when used in combination with the softirq_exit tracepoint
  93  * we can determine the softirq latency.
  94  */
  95 TRACE_EVENT(softirq_entry,
  96
  97         TP_PROTO(struct softirq_action *h, struct softirq_action *vec),
  98
  99         TP_ARGS(h, vec),
 100
 101         TP_STRUCT__entry(
 102                 __field(        int,    vec                     )
 103         ),
 104
 105         TP_fast_assign(
 106                 __entry->vec = (int)(h - vec);
 107         ),
 108
 109         TP_printk("softirq=%d action=%s", __entry->vec,
 110                   show_softirq_name(__entry->vec))
 111 );
 112
 113 /**
 114  * softirq_exit - called immediately after the softirq handler returns
 115  * @h: pointer to struct softirq_action
 116  * @vec: pointer to first struct softirq_action in softirq_vec array
 117  *
 118  * The @h parameter contains a pointer to the struct softirq_action
 119  * that has handled the softirq. By subtracting the @vec pointer from
 120  * the @h pointer, we can determine the softirq number. Also, when used in
 121  * combination with the softirq_entry tracepoint we can determine the softirq
 122  * latency.
 123  */
 124 TRACE_EVENT(softirq_exit,
 125
 126         TP_PROTO(struct softirq_action *h, struct softirq_action *vec),
 127
 128         TP_ARGS(h, vec),
 129
 130         TP_STRUCT__entry(
 131                 __field(        int,    vec                     )
 132         ),
 133
 134         TP_fast_assign(
 135                 __entry->vec = (int)(h - vec);
 136         ),
 137
 138         TP_printk("softirq=%d action=%s", __entry->vec,
 139                   show_softirq_name(__entry->vec))
 140 );
 141
 142 #endif /*  _TRACE_IRQ_H */
 143
 144 /* This part must be outside protection */
 145 #include <trace/define_trace.h>