summaryrefslogtreecommitdiff
path: root/scripts/gdb/linux/timerlist.py
blob: 071d0dd5a634977a74b792f313e9c93bdca8f28b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
# SPDX-License-Identifier: GPL-2.0
#
# Copyright 2019 Google LLC.

import binascii
import gdb

from linux import constants
from linux import cpus
from linux import rbtree
from linux import utils

timerqueue_node_type = utils.CachedType("struct timerqueue_node").get_type()
hrtimer_type = utils.CachedType("struct hrtimer").get_type()


def ktime_get():
    """Returns the current time, but not very accurately

    We can't read the hardware timer itself to add any nanoseconds
    that need to be added since we last stored the time in the
    timekeeper. But this is probably good enough for debug purposes."""
    tk_core = gdb.parse_and_eval("&tk_core")

    return tk_core['timekeeper']['tkr_mono']['base']


def print_timer(rb_node, idx):
    timerqueue = utils.container_of(rb_node, timerqueue_node_type.pointer(),
                                    "node")
    timer = utils.container_of(timerqueue, hrtimer_type.pointer(), "node")

    function = str(timer['function']).split(" ")[1].strip("<>")
    softexpires = timer['_softexpires']
    expires = timer['node']['expires']
    now = ktime_get()

    text = " #{}: <{}>, {}, ".format(idx, timer, function)
    text += "S:{:02x}\n".format(int(timer['state']))
    text += " # expires at {}-{} nsecs [in {} to {} nsecs]\n".format(
            softexpires, expires, softexpires - now, expires - now)
    return text


def print_active_timers(base):
    curr = base['active']['next']['node']
    curr = curr.address.cast(rbtree.rb_node_type.get_type().pointer())
    idx = 0
    while curr:
        yield print_timer(curr, idx)
        curr = rbtree.rb_next(curr)
        idx += 1


def print_base(base):
    text = " .base:       {}\n".format(base.address)
    text += " .index:      {}\n".format(base['index'])

    text += " .resolution: {} nsecs\n".format(constants.LX_hrtimer_resolution)

    text += " .get_time:   {}\n".format(base['get_time'])
    if constants.LX_CONFIG_HIGH_RES_TIMERS:
        text += "  .offset:     {} nsecs\n".format(base['offset'])
    text += "active timers:\n"
    text += "".join([x for x in print_active_timers(base)])
    return text


def print_cpu(hrtimer_bases, cpu, max_clock_bases):
    cpu_base = cpus.per_cpu(hrtimer_bases, cpu)
    jiffies = gdb.parse_and_eval("jiffies_64")
    tick_sched_ptr = gdb.parse_and_eval("&tick_cpu_sched")
    ts = cpus.per_cpu(tick_sched_ptr, cpu)

    text = "cpu: {}\n".format(cpu)
    for i in xrange(max_clock_bases):
        text += " clock {}:\n".format(i)
        text += print_base(cpu_base['clock_base'][i])

        if constants.LX_CONFIG_HIGH_RES_TIMERS:
            fmts = [("  .{}   : {} nsecs", 'expires_next'),
                    ("  .{}    : {}", 'hres_active'),
                    ("  .{}      : {}", 'nr_events'),
                    ("  .{}     : {}", 'nr_retries'),
                    ("  .{}       : {}", 'nr_hangs'),
                    ("  .{}  : {}", 'max_hang_time')]
            text += "\n".join([s.format(f, cpu_base[f]) for s, f in fmts])
            text += "\n"

        if constants.LX_CONFIG_TICK_ONESHOT:
            fmts = [("  .{}      : {}", 'nohz_mode'),
                    ("  .{}      : {} nsecs", 'last_tick'),
                    ("  .{}   : {}", 'tick_stopped'),
                    ("  .{}   : {}", 'idle_jiffies'),
                    ("  .{}     : {}", 'idle_calls'),
                    ("  .{}    : {}", 'idle_sleeps'),
                    ("  .{} : {} nsecs", 'idle_entrytime'),
                    ("  .{}  : {} nsecs", 'idle_waketime'),
                    ("  .{}  : {} nsecs", 'idle_exittime'),
                    ("  .{} : {} nsecs", 'idle_sleeptime'),
                    ("  .{}: {} nsecs", 'iowait_sleeptime'),
                    ("  .{}   : {}", 'last_jiffies'),
                    ("  .{}     : {}", 'next_timer'),
                    ("  .{}   : {} nsecs", 'idle_expires')]
            text += "\n".join([s.format(f, ts[f]) for s, f in fmts])
            text += "\njiffies: {}\n".format(jiffies)

        text += "\n"

    return text


def print_tickdevice(td, cpu):
    dev = td['evtdev']
    text = "Tick Device: mode:     {}\n".format(td['mode'])
    if cpu < 0:
            text += "Broadcast device\n"
    else:
            text += "Per CPU device: {}\n".format(cpu)

    text += "Clock Event Device: "
    if dev == 0:
            text += "<NULL>\n"
            return text

    text += "{}\n".format(dev['name'])
    text += " max_delta_ns:   {}\n".format(dev['max_delta_ns'])
    text += " min_delta_ns:   {}\n".format(dev['min_delta_ns'])
    text += " mult:           {}\n".format(dev['mult'])
    text += " shift:          {}\n".format(dev['shift'])
    text += " mode:           {}\n".format(dev['state_use_accessors'])
    text += " next_event:     {} nsecs\n".format(dev['next_event'])

    text += " set_next_event: {}\n".format(dev['set_next_event'])

    members = [('set_state_shutdown', " shutdown: {}\n"),
               ('set_state_periodic', " periodic: {}\n"),
               ('set_state_oneshot', " oneshot:  {}\n"),
               ('set_state_oneshot_stopped', " oneshot stopped: {}\n"),
               ('tick_resume', " resume:   {}\n")]
    for member, fmt in members:
        if dev[member]:
            text += fmt.format(dev[member])

    text += " event_handler:  {}\n".format(dev['event_handler'])
    text += " retries:        {}\n".format(dev['retries'])

    return text


def pr_cpumask(mask):
    nr_cpu_ids = 1
    if constants.LX_NR_CPUS > 1:
        nr_cpu_ids = gdb.parse_and_eval("nr_cpu_ids")

    inf = gdb.inferiors()[0]
    bits = mask['bits']
    num_bytes = (nr_cpu_ids + 7) / 8
    buf = utils.read_memoryview(inf, bits, num_bytes).tobytes()
    buf = binascii.b2a_hex(buf)

    chunks = []
    i = num_bytes
    while i > 0:
        i -= 1
        start = i * 2
        end = start + 2
        chunks.append(buf[start:end])
        if i != 0 and i % 4 == 0:
            chunks.append(',')

    extra = nr_cpu_ids % 8
    if 0 < extra <= 4:
        chunks[0] = chunks[0][0]  # Cut off the first 0

    return "".join(chunks)


class LxTimerList(gdb.Command):
    """Print /proc/timer_list"""

    def __init__(self):
        super(LxTimerList, self).__init__("lx-timerlist", gdb.COMMAND_DATA)

    def invoke(self, arg, from_tty):
        hrtimer_bases = gdb.parse_and_eval("&hrtimer_bases")
        max_clock_bases = gdb.parse_and_eval("HRTIMER_MAX_CLOCK_BASES")

        text = "Timer List Version: gdb scripts\n"
        text += "HRTIMER_MAX_CLOCK_BASES: {}\n".format(max_clock_bases)
        text += "now at {} nsecs\n".format(ktime_get())

        for cpu in cpus.each_online_cpu():
            text += print_cpu(hrtimer_bases, cpu, max_clock_bases)

        if constants.LX_CONFIG_GENERIC_CLOCKEVENTS:
            if constants.LX_CONFIG_GENERIC_CLOCKEVENTS_BROADCAST:
                bc_dev = gdb.parse_and_eval("&tick_broadcast_device")
                text += print_tickdevice(bc_dev, -1)
                text += "\n"
                mask = gdb.parse_and_eval("tick_broadcast_mask")
                mask = pr_cpumask(mask)
                text += "tick_broadcast_mask: {}\n".format(mask)
                if constants.LX_CONFIG_TICK_ONESHOT:
                    mask = gdb.parse_and_eval("tick_broadcast_oneshot_mask")
                    mask = pr_cpumask(mask)
                    text += "tick_broadcast_oneshot_mask: {}\n".format(mask)
                text += "\n"

            tick_cpu_devices = gdb.parse_and_eval("&tick_cpu_device")
            for cpu in cpus.each_online_cpu():
                tick_dev = cpus.per_cpu(tick_cpu_devices, cpu)
                text += print_tickdevice(tick_dev, cpu)
                text += "\n"

        gdb.write(text)


LxTimerList()