lttnganalyses/linuxautomaton/irq.py

   1 #!/usr/bin/env python3
   2 #
   3 # The MIT License (MIT)
   4 #
   5 # Copyright (C) 2015 - Julien Desfossez <jdesfossez@efficios.com>
   6 #               2015 - Antoine Busque <abusque@efficios.com>
   7 #
   8 # Permission is hereby granted, free of charge, to any person obtaining a copy
   9 # of this software and associated documentation files (the "Software"), to deal
  10 # in the Software without restriction, including without limitation the rights
  11 # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  12 # copies of the Software, and to permit persons to whom the Software is
  13 # furnished to do so, subject to the following conditions:
  14 #
  15 # The above copyright notice and this permission notice shall be included in
  16 # all copies or substantial portions of the Software.
  17 #
  18 # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  19 # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20 # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  21 # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  22 # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  23 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  24 # SOFTWARE.
  25
  26 from . import sp, sv
  27
  28
  29 class IrqStateProvider(sp.StateProvider):
  30     def __init__(self, state):
  31         cbs = {
  32             'irq_handler_entry': self._process_irq_handler_entry,
  33             'irq_handler_exit': self._process_irq_handler_exit,
  34             'softirq_raise': self._process_softirq_raise,
  35             'softirq_entry': self._process_softirq_entry,
  36             'softirq_exit': self._process_softirq_exit
  37         }
  38
  39         self._state = state
  40         self._register_cbs(cbs)
  41
  42     def process_event(self, ev):
  43         self._process_event_cb(ev)
  44
  45     def _get_cpu(self, cpu_id):
  46         if cpu_id not in self._state.cpus:
  47             self._state.cpus[cpu_id] = sv.CPU(cpu_id)
  48
  49         return self._state.cpus[cpu_id]
  50
  51     # Hard IRQs
  52     def _process_irq_handler_entry(self, event):
  53         cpu = self._get_cpu(event['cpu_id'])
  54         irq = sv.HardIRQ.new_from_irq_handler_entry(event)
  55         cpu.current_hard_irq = irq
  56
  57         self._state.send_notification_cb('irq_handler_entry',
  58                                          id=irq.id,
  59                                          irq_name=event['name'])
  60
  61     def _process_irq_handler_exit(self, event):
  62         cpu = self._get_cpu(event['cpu_id'])
  63         if cpu.current_hard_irq is None or \
  64            cpu.current_hard_irq.id != event['irq']:
  65             cpu.current_hard_irq = None
  66             return
  67
  68         cpu.current_hard_irq.end_ts = event.timestamp
  69         cpu.current_hard_irq.ret = event['ret']
  70
  71         self._state.send_notification_cb('irq_handler_exit',
  72                                          hard_irq=cpu.current_hard_irq)
  73         cpu.current_hard_irq = None
  74
  75     # SoftIRQs
  76     def _process_softirq_raise(self, event):
  77         cpu = self._get_cpu(event['cpu_id'])
  78         vec = event['vec']
  79
  80         if vec not in cpu.current_softirqs:
  81             cpu.current_softirqs[vec] = []
  82
  83         # Don't append a SoftIRQ object if one has already been raised,
  84         # because they are level-triggered. The only exception to this
  85         # is if the first SoftIRQ object already had a begin_ts which
  86         # means this raise was triggered after its entry, and will be
  87         # handled in the following softirq_entry
  88         if cpu.current_softirqs[vec] and \
  89            cpu.current_softirqs[vec][0].begin_ts is None:
  90             return
  91
  92         irq = sv.SoftIRQ.new_from_softirq_raise(event)
  93         cpu.current_softirqs[vec].append(irq)
  94
  95     def _process_softirq_entry(self, event):
  96         cpu = self._get_cpu(event['cpu_id'])
  97         vec = event['vec']
  98
  99         if cpu.current_softirqs[vec]:
 100             cpu.current_softirqs[vec][0].begin_ts = event.timestamp
 101         else:
 102             # SoftIRQ entry without a corresponding raise
 103             irq = sv.SoftIRQ.new_from_softirq_entry(event)
 104             cpu.current_softirqs[vec].append(irq)
 105
 106     def _process_softirq_exit(self, event):
 107         cpu = self._get_cpu(event['cpu_id'])
 108         vec = event['vec']
 109
 110         if not cpu.current_softirqs[vec]:
 111             return
 112
 113         cpu.current_softirqs[vec][0].end_ts = event.timestamp
 114         self._state.send_notification_cb('softirq_exit',
 115                                          softirq=cpu.current_softirqs[vec][0])
 116         del cpu.current_softirqs[vec][0]