1 # SPDX-License-Identifier: GPL-2.0
3 # Copyright 2019 Google LLC.
8 from linux import constants
10 from linux import rbtree
11 from linux import utils
13 timerqueue_node_type = utils.CachedType("struct timerqueue_node").get_type()
14 hrtimer_type = utils.CachedType("struct hrtimer").get_type()
18 """Returns the current time, but not very accurately
20 We can't read the hardware timer itself to add any nanoseconds
21 that need to be added since we last stored the time in the
22 timekeeper. But this is probably good enough for debug purposes."""
23 tk_core = gdb.parse_and_eval("&tk_core")
25 return tk_core['timekeeper']['tkr_mono']['base']
28 def print_timer(rb_node, idx):
29 timerqueue = utils.container_of(rb_node, timerqueue_node_type.pointer(),
31 timer = utils.container_of(timerqueue, hrtimer_type.pointer(), "node")
33 function = str(timer['function']).split(" ")[1].strip("<>")
34 softexpires = timer['_softexpires']
35 expires = timer['node']['expires']
38 text = " #{}: <{}>, {}, ".format(idx, timer, function)
39 text += "S:{:02x}\n".format(int(timer['state']))
40 text += " # expires at {}-{} nsecs [in {} to {} nsecs]\n".format(
41 softexpires, expires, softexpires - now, expires - now)
45 def print_active_timers(base):
46 curr = base['active']['next']['node']
47 curr = curr.address.cast(rbtree.rb_node_type.get_type().pointer())
50 yield print_timer(curr, idx)
51 curr = rbtree.rb_next(curr)
56 text = " .base: {}\n".format(base.address)
57 text += " .index: {}\n".format(base['index'])
59 text += " .resolution: {} nsecs\n".format(constants.LX_hrtimer_resolution)
61 text += " .get_time: {}\n".format(base['get_time'])
62 if constants.LX_CONFIG_HIGH_RES_TIMERS:
63 text += " .offset: {} nsecs\n".format(base['offset'])
64 text += "active timers:\n"
65 text += "".join([x for x in print_active_timers(base)])
69 def print_cpu(hrtimer_bases, cpu, max_clock_bases):
70 cpu_base = cpus.per_cpu(hrtimer_bases, cpu)
71 jiffies = gdb.parse_and_eval("jiffies_64")
72 tick_sched_ptr = gdb.parse_and_eval("&tick_cpu_sched")
73 ts = cpus.per_cpu(tick_sched_ptr, cpu)
75 text = "cpu: {}\n".format(cpu)
76 for i in range(max_clock_bases):
77 text += " clock {}:\n".format(i)
78 text += print_base(cpu_base['clock_base'][i])
80 if constants.LX_CONFIG_HIGH_RES_TIMERS:
81 fmts = [(" .{} : {} nsecs", 'expires_next'),
82 (" .{} : {}", 'hres_active'),
83 (" .{} : {}", 'nr_events'),
84 (" .{} : {}", 'nr_retries'),
85 (" .{} : {}", 'nr_hangs'),
86 (" .{} : {}", 'max_hang_time')]
87 text += "\n".join([s.format(f, cpu_base[f]) for s, f in fmts])
90 if constants.LX_CONFIG_TICK_ONESHOT:
91 fmts = [(" .{} : {}", 'nohz_mode'),
92 (" .{} : {} nsecs", 'last_tick'),
93 (" .{} : {}", 'tick_stopped'),
94 (" .{} : {}", 'idle_jiffies'),
95 (" .{} : {}", 'idle_calls'),
96 (" .{} : {}", 'idle_sleeps'),
97 (" .{} : {} nsecs", 'idle_entrytime'),
98 (" .{} : {} nsecs", 'idle_waketime'),
99 (" .{} : {} nsecs", 'idle_exittime'),
100 (" .{} : {} nsecs", 'idle_sleeptime'),
101 (" .{}: {} nsecs", 'iowait_sleeptime'),
102 (" .{} : {}", 'last_jiffies'),
103 (" .{} : {}", 'next_timer'),
104 (" .{} : {} nsecs", 'idle_expires')]
105 text += "\n".join([s.format(f, ts[f]) for s, f in fmts])
106 text += "\njiffies: {}\n".format(jiffies)
113 def print_tickdevice(td, cpu):
115 text = "Tick Device: mode: {}\n".format(td['mode'])
117 text += "Broadcast device\n"
119 text += "Per CPU device: {}\n".format(cpu)
121 text += "Clock Event Device: "
126 text += "{}\n".format(dev['name'])
127 text += " max_delta_ns: {}\n".format(dev['max_delta_ns'])
128 text += " min_delta_ns: {}\n".format(dev['min_delta_ns'])
129 text += " mult: {}\n".format(dev['mult'])
130 text += " shift: {}\n".format(dev['shift'])
131 text += " mode: {}\n".format(dev['state_use_accessors'])
132 text += " next_event: {} nsecs\n".format(dev['next_event'])
134 text += " set_next_event: {}\n".format(dev['set_next_event'])
136 members = [('set_state_shutdown', " shutdown: {}\n"),
137 ('set_state_periodic', " periodic: {}\n"),
138 ('set_state_oneshot', " oneshot: {}\n"),
139 ('set_state_oneshot_stopped', " oneshot stopped: {}\n"),
140 ('tick_resume', " resume: {}\n")]
141 for member, fmt in members:
143 text += fmt.format(dev[member])
145 text += " event_handler: {}\n".format(dev['event_handler'])
146 text += " retries: {}\n".format(dev['retries'])
151 def pr_cpumask(mask):
153 if constants.LX_NR_CPUS > 1:
154 nr_cpu_ids = gdb.parse_and_eval("nr_cpu_ids")
156 inf = gdb.inferiors()[0]
158 num_bytes = (nr_cpu_ids + 7) / 8
159 buf = utils.read_memoryview(inf, bits, num_bytes).tobytes()
160 buf = binascii.b2a_hex(buf)
161 if type(buf) is not str:
170 chunks.append(buf[start:end])
171 if i != 0 and i % 4 == 0:
174 extra = nr_cpu_ids % 8
176 chunks[0] = chunks[0][0] # Cut off the first 0
178 return "".join(chunks)
181 class LxTimerList(gdb.Command):
182 """Print /proc/timer_list"""
185 super(LxTimerList, self).__init__("lx-timerlist", gdb.COMMAND_DATA)
187 def invoke(self, arg, from_tty):
188 hrtimer_bases = gdb.parse_and_eval("&hrtimer_bases")
189 max_clock_bases = gdb.parse_and_eval("HRTIMER_MAX_CLOCK_BASES")
191 text = "Timer List Version: gdb scripts\n"
192 text += "HRTIMER_MAX_CLOCK_BASES: {}\n".format(max_clock_bases)
193 text += "now at {} nsecs\n".format(ktime_get())
195 for cpu in cpus.each_online_cpu():
196 text += print_cpu(hrtimer_bases, cpu, max_clock_bases)
198 if constants.LX_CONFIG_GENERIC_CLOCKEVENTS:
199 if constants.LX_CONFIG_GENERIC_CLOCKEVENTS_BROADCAST:
200 bc_dev = gdb.parse_and_eval("&tick_broadcast_device")
201 text += print_tickdevice(bc_dev, -1)
203 mask = gdb.parse_and_eval("tick_broadcast_mask")
204 mask = pr_cpumask(mask)
205 text += "tick_broadcast_mask: {}\n".format(mask)
206 if constants.LX_CONFIG_TICK_ONESHOT:
207 mask = gdb.parse_and_eval("tick_broadcast_oneshot_mask")
208 mask = pr_cpumask(mask)
209 text += "tick_broadcast_oneshot_mask: {}\n".format(mask)
212 tick_cpu_devices = gdb.parse_and_eval("&tick_cpu_device")
213 for cpu in cpus.each_online_cpu():
214 tick_dev = cpus.per_cpu(tick_cpu_devices, cpu)
215 text += print_tickdevice(tick_dev, cpu)