linux.git/scripts/gdb, branch v5.4-rc2

scripts/gdb: handle split debug

2019-09-26T00:51:40+00:00

Some systems (like Chrome OS) may use "split debug" for kernel modules.
That means that the debug symbols are in a different file than the main
elf file.  Let's handle that by also searching for debug symbols that end
in ".ko.debug".

This is a packaging topic.  You can take a normal elf file and split the
debug out of it using objcopy.  Try "man objcopy" and then take a look at
the "--only-keep-debug" option.  It'll give you a whole recipe for doing
splitdebug.  The suffix used for the debug symbols is arbitrary.  If
people have other another suffix besides ".ko.debug" then we could
presumably support that too...

For portage (which is the packaging system used by Chrome OS) split debug
is supported by default (and the suffix is .ko.debug).  ...and so in
Chrome OS we always get the installed elf files stripped and then the
symbols stashed away.

At the moment we don't actually use the normal portage magic to do this
for the kernel though since it affects our ability to get good stack dumps
in the kernel.  We instead pass a script as "strip" [1].

[1] https://chromium.googlesource.com/chromiumos/overlays/chromiumos-overlay/+/refs/heads/master/eclass/cros-kernel/strip_splitdebug

Link: http://lkml.kernel.org/r/20190730234052.148744-1-dianders@chromium.org
Signed-off-by: Douglas Anderson 
Reviewed-by: Stephen Boyd 
Reviewed-by: Jan Kiszka 
Cc: Kieran Bingham 
Cc: Jason Wessel 
Cc: Daniel Thompson 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

scripts/gdb: add helpers to find and list devices

2019-07-17T02:23:24+00:00

Add helper commands and functions for finding pointers to struct device
by enumerating linux device bus/class infrastructure.  This can be used
to fetch subsystem and driver-specific structs:

  (gdb) p *$container_of($lx_device_find_by_class_name("net", "eth0"), "struct net_device", "dev")
  (gdb) p *$container_of($lx_device_find_by_bus_name("i2c", "0-004b"), "struct i2c_client", "dev")
  (gdb) p *(struct imx_port*)$lx_device_find_by_class_name("tty", "ttymxc1")->parent->driver_data

Several generic "lx-device-list" functions are included to enumerate
devices by bus and class:

  (gdb) lx-device-list-bus usb
  (gdb) lx-device-list-class
  (gdb) lx-device-list-tree &platform_bus

Similar information is available in /sys but pointer values are
deliberately hidden.

Link: http://lkml.kernel.org/r/c948628041311cbf1b9b4cff3dda7d2073cb3eaa.1561492937.git.leonard.crestez@nxp.com
Signed-off-by: Leonard Crestez 
Reviewed-by: Stephen Boyd 
Cc: Kieran Bingham 
Cc: Jan Kiszka 
Cc: "Rafael J. Wysocki" 
Cc: Greg Kroah-Hartman 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

scripts/gdb: add lx-genpd-summary command

2019-07-17T02:23:24+00:00

This is like /sys/kernel/debug/pm/pm_genpd_summary except it's
accessible through a debugger.

This can be useful if the target crashes or hangs because power domains
were not properly enabled.

Link: http://lkml.kernel.org/r/f9ee627a0d4f94b894aa202fee8a98444049bed8.1561492937.git.leonard.crestez@nxp.com
Signed-off-by: Leonard Crestez 
Reviewed-by: Stephen Boyd 
Cc: Kieran Bingham 
Cc: Jan Kiszka 
Cc: "Rafael J. Wysocki" 
Cc: Greg Kroah-Hartman 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

kbuild: replace KBUILD_SRCTREE with boolean building_out_of_srctree

2019-07-10T15:05:09+00:00

Commit 25b146c5b8ce ("kbuild: allow Kbuild to start from any directory")
deprecated KBUILD_SRCTREE.

It is only used in tools/testing/selftest/ to distinguish out-of-tree
build. Replace it with a new boolean flag, building_out_of_srctree.

I also replaced the conditional ($(srctree),.) because the next commit
will allow an absolute path to be used for $(srctree) even when building
in the source tree.

Signed-off-by: Masahiro Yamada

scripts/gdb: fix invocation when CONFIG_COMMON_CLK is not set

2019-06-01T22:51:31+00:00

CLK_GET_RATE_NOCACHE depends on CONFIG_COMMON_CLK.  Importing constants.py
when CONFIG_COMMON_CLK is not defined causes:

  (gdb) lx-symbols
  (...)
    File "scripts/gdb/linux/proc.py", line 15, in 
      from linux import constants
    File "scripts/gdb/linux/constants.py", line 2, in 
      LX_CLK_GET_RATE_NOCACHE = gdb.parse_and_eval("CLK_GET_RATE_NOCACHE")
  gdb.error: No symbol "CLK_GET_RATE_NOCACHE" in current context.

Link: http://lkml.kernel.org/r/20190523195313.24701-1-farosas@linux.ibm.com
Fixes: e7e6f462c1be ("scripts/gdb: print cached rate in lx-clk-summary")
Signed-off-by: Fabiano Rosas 
Reviewed-by: Stephen Boyd 
Cc: Jan Kiszka 
Cc: Kieran Bingham 
Cc: Leonard Crestez 
Cc: Jackie Liu 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

treewide: Add SPDX license identifier - Makefile/Kconfig

2019-05-21T08:50:46+00:00

Add SPDX license identifiers to all Make/Kconfig files which:

 - Have no license information of any form

These files fall under the project license, GPL v2 only. The resulting SPDX
license identifier is:

  GPL-2.0-only

Signed-off-by: Thomas Gleixner 
Signed-off-by: Greg Kroah-Hartman

scripts/gdb: print cached rate in lx-clk-summary

2019-05-15T02:52:52+00:00

The clk rate is always stored in clk_core but might be out of date and
require calls to update from hardware.

Deal with that case by printing a (c) suffix.

Link: http://lkml.kernel.org/r/1a474318982a5f0125f2360c4161029b17f56bd1.1556881728.git.leonard.crestez@nxp.com
Signed-off-by: Leonard Crestez 
Cc: Jan Kiszka 
Cc: Jason Wessel 
Cc: Kieran Bingham 
Cc: Stephen Boyd 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

scripts/gdb: clean up error handling in list helpers

2019-05-15T02:52:52+00:00

An incorrect argument to list_for_each is an internal error in gdb
scripts so a TypeError should be raised.  The gdb.GdbError exception
type is intended for user errors such as incorrect invocation.

Drop the type assertion in list_for_each_entry because list_for_each
isn't going to suddenly yield something else.

Applies to both list and hlist

Link: http://lkml.kernel.org/r/c1d3fd4db13d999a3ba57f5bbc1924862d824f61.1556881728.git.leonard.crestez@nxp.com
Signed-off-by: Leonard Crestez 
Reviewed-by: Stephen Boyd 
Cc: Jan Kiszka 
Cc: Jason Wessel 
Cc: Kieran Bingham 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

scripts/gdb: add $lx_clk_core_lookup function

2019-05-15T02:52:52+00:00

Finding an individual clk_core requires walking the tree which can be
quite complicated so add a helper for easy access.

(gdb) print *(struct clk_scu*)$lx_clk_core_lookup("uart0_clk")->hw

Link: http://lkml.kernel.org/r/Message-ID:
Signed-off-by: Leonard Crestez 
Cc: Jan Kiszka 
Cc: Jason Wessel 
Cc: Kieran Bingham 
Cc: Stephen Boyd 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

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

2019-05-15T02:52:52+00:00

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 
Cc: Jan Kiszka 
Cc: Jason Wessel 
Cc: Kieran Bingham 
Cc: Stephen Boyd 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds