# 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 += "\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() /kernel/log/arch/riscv/kernel/ftrace.c'>
path: root/arch/riscv/kernel/ftrace.c
AgeCommit message (Expand)Author
2021-10-08ftrace: Cleanup ftrace_dyn_arch_init()Weizhao Ouyang
2021-01-14riscv: Using PATCHABLE_FUNCTION_ENTRY instead of MCOUNTGuo Ren
2020-11-04risc-v: kernel: ftrace: Fixes improper SPDX comment styleRyan Kosta
2020-09-11RISC-V: Take text_mutex in ftrace_init_nop()Palmer Dabbelt
2020-06-17maccess: rename probe_kernel_{read,write} to copy_{from,to}_kernel_nofaultChristoph Hellwig
2020-05-18riscv: Use text_mutex instead of patch_lockZong Li
2020-05-18riscv: Remove the 'riscv_' prefix of function nameZong Li
2020-03-26riscv: patch code by fixmap mappingZong Li
2020-01-03riscv: ftrace: correct the condition logic in function graph tracerZong Li
2019-02-11riscv: add missing newlines to printk messagesJohan Hovold
2018-12-21riscv: remove unused variable in ftraceDavid Abdurachmanov
2018-11-27riscv/function_graph: Simplify with function_graph_enter()Steven Rostedt (VMware)