scripts/gdb: initial clk support: lx-clk-summary

Add an lx-clk-summary command which prints a subset of
/sys/kernel/debug/clk/clk_summary.

This can be used to examine hangs caused by clk not being enabled.

Link: http://lkml.kernel.org/r/Message-ID:
Signed-off-by: Leonard Crestez <leonard.crestez@nxp.com>
Cc: Jan Kiszka <jan.kiszka@siemens.com>
Cc: Jason Wessel <jason.wessel@windriver.com>
Cc: Kieran Bingham <kbingham@kernel.org>
Cc: Stephen Boyd <swboyd@chromium.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Leonard Crestez 2019-05-14 15:46:08 -07:00 committed by Linus Torvalds
parent 47d0d12855
commit d1e9710b63
2 changed files with 47 additions and 0 deletions

46
scripts/gdb/linux/clk.py Normal file
View File

@ -0,0 +1,46 @@
# SPDX-License-Identifier: GPL-2.0
#
# Copyright (c) NXP 2019
import gdb
import sys
from linux import utils, lists
clk_core_type = utils.CachedType("struct clk_core")
def clk_core_for_each_child(hlist_head):
return lists.hlist_for_each_entry(hlist_head,
clk_core_type.get_type().pointer(), "child_node")
class LxClkSummary(gdb.Command):
"""Print Linux kernel log buffer."""
def __init__(self):
super(LxClkSummary, self).__init__("lx-clk-summary", gdb.COMMAND_DATA)
def show_subtree(self, clk, level):
gdb.write("%*s%-*s %7d %8d %8d\n" % (
level * 3 + 1, "",
30 - level * 3,
clk['name'].string(),
clk['enable_count'],
clk['prepare_count'],
clk['protect_count']))
for child in clk_core_for_each_child(clk['children']):
self.show_subtree(child, level + 1)
def invoke(self, arg, from_tty):
gdb.write(" enable prepare protect\n")
gdb.write(" clock count count count\n")
gdb.write("---------------------------------------------------------\n")
for clk in clk_core_for_each_child(gdb.parse_and_eval("clk_root_list")):
self.show_subtree(clk, 0)
for clk in clk_core_for_each_child(gdb.parse_and_eval("clk_orphan_list")):
self.show_subtree(clk, 0)
LxClkSummary()

View File

@ -34,3 +34,4 @@ else:
import linux.proc
import linux.constants
import linux.timerlist
import linux.clk