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Author SHA1 Message Date
Greg Kroah-Hartman
47bcc18c7e drivers: base: test: add proper SPDX identifier to Makefile 
The Makefile in the drivers/base/test/ directory did not have a SPDX
identifier on it, so fix that up.

Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2019-04-04 20:03:40 +02:00
Alexander Duyck
57ea974fb8 driver core: Rewrite test_async_driver_probe to cover serialization and NUMA affinity 
The current async_probe test code is only testing one device allocated
prior to driver load and only loading one device afterwards. Instead of
doing things this way it makes much more sense to load one device per CPU
in order to actually stress the async infrastructure. By doing this we
should see delays significantly increase in the event of devices being
serialized.

In addition I have updated the test to verify that we are trying to place
the work on the correct NUMA node when we are running in async mode. By
doing this we can verify the best possible outcome for device and driver
load times.

I have added a timeout value that is used to disable the sleep and instead
cause the probe routine to report an error indicating it timed out. By
doing this we limit the maximum runtime for the test to 20 seconds or less.

The last major change in this set is that I have gone through and tuned it
for handling the massive number of possible events that will be scheduled.
Instead of reporting the sleep for each individual device it is moved to
only being displayed if we enable debugging.

With this patch applied below are what a failing test and a passing test
should look like. I elided a few hundred lines in the failing test that
were duplicated since the system I was testing on had a massive number of
CPU cores:

-- Failing --
[  243.524697] test_async_driver_probe: registering first set of asynchronous devices...
[  243.535625] test_async_driver_probe: registering asynchronous driver...
[  243.543038] test_async_driver_probe: registration took 0 msecs
[  243.549559] test_async_driver_probe: registering second set of asynchronous devices...
[  243.568350] platform test_async_driver.447: registration took 9 msecs
[  243.575544] test_async_driver_probe: registering first synchronous device...
[  243.583454] test_async_driver_probe: registering synchronous driver...
[  248.825920] test_async_driver_probe: registration took 5235 msecs
[  248.825922] test_async_driver_probe: registering second synchronous device...
[  248.825928] test_async_driver test_async_driver.443: NUMA node mismatch 3 != 1
[  248.825932] test_async_driver test_async_driver.445: NUMA node mismatch 3 != 1
[  248.825935] test_async_driver test_async_driver.446: NUMA node mismatch 3 != 1
[  248.825939] test_async_driver test_async_driver.440: NUMA node mismatch 3 != 1
[  248.825943] test_async_driver test_async_driver.441: NUMA node mismatch 3 != 1
...
[  248.827150] test_async_driver test_async_driver.229: NUMA node mismatch 0 != 1
[  248.827158] test_async_driver test_async_driver.228: NUMA node mismatch 0 != 1
[  248.827220] test_async_driver test_async_driver.281: NUMA node mismatch 2 != 1
[  248.827229] test_async_driver test_async_driver.282: NUMA node mismatch 2 != 1
[  248.827240] test_async_driver test_async_driver.280: NUMA node mismatch 2 != 1
[  253.945834] test_async_driver test_async_driver.1: NUMA node mismatch 0 != 1
[  253.945878] test_sync_driver test_sync_driver.1: registration took 5119 msecs
[  253.961693] test_async_driver_probe: async events still pending, forcing timeout and synchronize
[  259.065839] test_async_driver test_async_driver.2: NUMA node mismatch 0 != 1
[  259.073786] test_async_driver test_async_driver.3: async probe took too long
[  259.081669] test_async_driver test_async_driver.3: NUMA node mismatch 0 != 1
[  259.089569] test_async_driver test_async_driver.4: async probe took too long
[  259.097451] test_async_driver test_async_driver.4: NUMA node mismatch 0 != 1
[  259.105338] test_async_driver test_async_driver.5: async probe took too long
[  259.113204] test_async_driver test_async_driver.5: NUMA node mismatch 0 != 1
[  259.121089] test_async_driver test_async_driver.6: async probe took too long
[  259.128961] test_async_driver test_async_driver.6: NUMA node mismatch 0 != 1
[  259.136850] test_async_driver test_async_driver.7: async probe took too long
...
[  262.124062] test_async_driver test_async_driver.221: async probe took too long
[  262.132130] test_async_driver test_async_driver.221: NUMA node mismatch 3 != 1
[  262.140206] test_async_driver test_async_driver.222: async probe took too long
[  262.148277] test_async_driver test_async_driver.222: NUMA node mismatch 3 != 1
[  262.156351] test_async_driver test_async_driver.223: async probe took too long
[  262.164419] test_async_driver test_async_driver.223: NUMA node mismatch 3 != 1
[  262.172630] test_async_driver_probe: Test failed with 222 errors and 336 warnings

-- Passing --
[  105.419247] test_async_driver_probe: registering first set of asynchronous devices...
[  105.432040] test_async_driver_probe: registering asynchronous driver...
[  105.439718] test_async_driver_probe: registration took 0 msecs
[  105.446239] test_async_driver_probe: registering second set of asynchronous devices...
[  105.477986] platform test_async_driver.447: registration took 22 msecs
[  105.485276] test_async_driver_probe: registering first synchronous device...
[  105.493169] test_async_driver_probe: registering synchronous driver...
[  110.597981] test_async_driver_probe: registration took 5097 msecs
[  110.604806] test_async_driver_probe: registering second synchronous device...
[  115.707490] test_sync_driver test_sync_driver.1: registration took 5094 msecs
[  115.715478] test_async_driver_probe: completed successfully

Signed-off-by: Alexander Duyck <alexander.h.duyck@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2019-01-31 14:20:54 +01:00
Greg Kroah-Hartman
3282570990 driver core: Remove redundant license text 
Now that the SPDX tag is in all driver core files, that identifies the
license in a specific and legally-defined manner.  So the extra GPL text
wording can be removed as it is no longer needed at all.

This is done on a quest to remove the 700+ different ways that files in
the kernel describe the GPL license text.  And there's unneeded stuff
like the address (sometimes incorrect) for the FSF which is never
needed.

No copyright headers or other non-license-description text was removed.

Cc: Johannes Berg <johannes@sipsolutions.net>
Cc: "Luis R. Rodriguez" <mcgrof@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2017-12-07 18:36:44 +01:00
Greg Kroah-Hartman
989d42e85d driver core: add SPDX identifiers to all driver core files 
It's good to have SPDX identifiers in all files to make it easier to
audit the kernel tree for correct licenses.

Update the driver core files files with the correct SPDX license
identifier based on the license text in the file itself.  The SPDX
identifier is a legally binding shorthand, which can be used instead of
the full boiler plate text.

This work is based on a script and data from Thomas Gleixner, Philippe
Ombredanne, and Kate Stewart.

Cc: Johannes Berg <johannes@sipsolutions.net>
Cc: "Luis R. Rodriguez" <mcgrof@kernel.org>
Cc: William Breathitt Gray <vilhelm.gray@gmail.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Kate Stewart <kstewart@linuxfoundation.org>
Cc: Philippe Ombredanne <pombredanne@nexb.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2017-12-07 18:36:43 +01:00
Linus Torvalds
b9743042b3 Driver core patches for 4.15-rc1 
Here is the set of driver core / debugfs patches for 4.15-rc1.
 
 Not many here, mostly all are debugfs fixes to resolve some
 long-reported problems with files going away with references to them in
 userspace.  There's also some SPDX cleanups for the debugfs code, as
 well as a few other minor driver core changes for issues reported by
 people.
 
 All of these have been in linux-next for a week or more with no reported
 issues.
 
 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Merge tag 'driver-core-4.15-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core

Pull driver core updates from Greg KH:
 "Here is the set of driver core / debugfs patches for 4.15-rc1.

  Not many here, mostly all are debugfs fixes to resolve some
  long-reported problems with files going away with references to them
  in userspace. There's also some SPDX cleanups for the debugfs code, as
  well as a few other minor driver core changes for issues reported by
  people.

  All of these have been in linux-next for a week or more with no
  reported issues"

* tag 'driver-core-4.15-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core:
  driver core: Fix device link deferred probe
  debugfs: Remove redundant license text
  debugfs: add SPDX identifiers to all debugfs files
  debugfs: defer debugfs_fsdata allocation to first usage
  debugfs: call debugfs_real_fops() only after debugfs_file_get()
  debugfs: purge obsolete SRCU based removal protection
  IB/hfi1: convert to debugfs_file_get() and -put()
  debugfs: convert to debugfs_file_get() and -put()
  debugfs: debugfs_real_fops(): drop __must_hold sparse annotation
  debugfs: implement per-file removal protection
  debugfs: add support for more elaborate ->d_fsdata
  driver core: Move device_links_purge() after bus_remove_device()
  arch_topology: Fix section miss match warning due to free_raw_capacity()
  driver-core: pr_err() strings should end with newlines
 2017-11-16 08:55:30 -08:00
Greg Kroah-Hartman
b24413180f License cleanup: add SPDX GPL-2.0 license identifier to files with no license 
Many source files in the tree are missing licensing information, which
makes it harder for compliance tools to determine the correct license.

By default all files without license information are under the default
license of the kernel, which is GPL version 2.

Update the files which contain no license information with the 'GPL-2.0'
SPDX license identifier.  The SPDX identifier is a legally binding
shorthand, which can be used instead of the full boiler plate text.

This patch is based on work done by Thomas Gleixner and Kate Stewart and
Philippe Ombredanne.

How this work was done:

Patches were generated and checked against linux-4.14-rc6 for a subset of
the use cases:
 - file had no licensing information it it.
 - file was a */uapi/* one with no licensing information in it,
 - file was a */uapi/* one with existing licensing information,

Further patches will be generated in subsequent months to fix up cases
where non-standard license headers were used, and references to license
had to be inferred by heuristics based on keywords.

The analysis to determine which SPDX License Identifier to be applied to
a file was done in a spreadsheet of side by side results from of the
output of two independent scanners (ScanCode & Windriver) producing SPDX
tag:value files created by Philippe Ombredanne.  Philippe prepared the
base worksheet, and did an initial spot review of a few 1000 files.

The 4.13 kernel was the starting point of the analysis with 60,537 files
assessed.  Kate Stewart did a file by file comparison of the scanner
results in the spreadsheet to determine which SPDX license identifier(s)
to be applied to the file. She confirmed any determination that was not
immediately clear with lawyers working with the Linux Foundation.

Criteria used to select files for SPDX license identifier tagging was:
 - Files considered eligible had to be source code files.
 - Make and config files were included as candidates if they contained >5
   lines of source
 - File already had some variant of a license header in it (even if <5
   lines).

All documentation files were explicitly excluded.

The following heuristics were used to determine which SPDX license
identifiers to apply.

 - when both scanners couldn't find any license traces, file was
   considered to have no license information in it, and the top level
   COPYING file license applied.

   For non */uapi/* files that summary was:

   SPDX license identifier                            # files
   ---------------------------------------------------|-------
   GPL-2.0                                              11139

   and resulted in the first patch in this series.

   If that file was a */uapi/* path one, it was "GPL-2.0 WITH
   Linux-syscall-note" otherwise it was "GPL-2.0".  Results of that was:

   SPDX license identifier                            # files
   ---------------------------------------------------|-------
   GPL-2.0 WITH Linux-syscall-note                        930

   and resulted in the second patch in this series.

 - if a file had some form of licensing information in it, and was one
   of the */uapi/* ones, it was denoted with the Linux-syscall-note if
   any GPL family license was found in the file or had no licensing in
   it (per prior point).  Results summary:

   SPDX license identifier                            # files
   ---------------------------------------------------|------
   GPL-2.0 WITH Linux-syscall-note                       270
   GPL-2.0+ WITH Linux-syscall-note                      169
   ((GPL-2.0 WITH Linux-syscall-note) OR BSD-2-Clause)    21
   ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause)    17
   LGPL-2.1+ WITH Linux-syscall-note                      15
   GPL-1.0+ WITH Linux-syscall-note                       14
   ((GPL-2.0+ WITH Linux-syscall-note) OR BSD-3-Clause)    5
   LGPL-2.0+ WITH Linux-syscall-note                       4
   LGPL-2.1 WITH Linux-syscall-note                        3
   ((GPL-2.0 WITH Linux-syscall-note) OR MIT)              3
   ((GPL-2.0 WITH Linux-syscall-note) AND MIT)             1

   and that resulted in the third patch in this series.

 - when the two scanners agreed on the detected license(s), that became
   the concluded license(s).

 - when there was disagreement between the two scanners (one detected a
   license but the other didn't, or they both detected different
   licenses) a manual inspection of the file occurred.

 - In most cases a manual inspection of the information in the file
   resulted in a clear resolution of the license that should apply (and
   which scanner probably needed to revisit its heuristics).

 - When it was not immediately clear, the license identifier was
   confirmed with lawyers working with the Linux Foundation.

 - If there was any question as to the appropriate license identifier,
   the file was flagged for further research and to be revisited later
   in time.

In total, over 70 hours of logged manual review was done on the
spreadsheet to determine the SPDX license identifiers to apply to the
source files by Kate, Philippe, Thomas and, in some cases, confirmation
by lawyers working with the Linux Foundation.

Kate also obtained a third independent scan of the 4.13 code base from
FOSSology, and compared selected files where the other two scanners
disagreed against that SPDX file, to see if there was new insights.  The
Windriver scanner is based on an older version of FOSSology in part, so
they are related.

Thomas did random spot checks in about 500 files from the spreadsheets
for the uapi headers and agreed with SPDX license identifier in the
files he inspected. For the non-uapi files Thomas did random spot checks
in about 15000 files.

In initial set of patches against 4.14-rc6, 3 files were found to have
copy/paste license identifier errors, and have been fixed to reflect the
correct identifier.

Additionally Philippe spent 10 hours this week doing a detailed manual
inspection and review of the 12,461 patched files from the initial patch
version early this week with:
 - a full scancode scan run, collecting the matched texts, detected
   license ids and scores
 - reviewing anything where there was a license detected (about 500+
   files) to ensure that the applied SPDX license was correct
 - reviewing anything where there was no detection but the patch license
   was not GPL-2.0 WITH Linux-syscall-note to ensure that the applied
   SPDX license was correct

This produced a worksheet with 20 files needing minor correction.  This
worksheet was then exported into 3 different .csv files for the
different types of files to be modified.

These .csv files were then reviewed by Greg.  Thomas wrote a script to
parse the csv files and add the proper SPDX tag to the file, in the
format that the file expected.  This script was further refined by Greg
based on the output to detect more types of files automatically and to
distinguish between header and source .c files (which need different
comment types.)  Finally Greg ran the script using the .csv files to
generate the patches.

Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Reviewed-by: Philippe Ombredanne <pombredanne@nexb.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2017-11-02 11:10:55 +01:00
Arvind Yadav
f4f89f23e6 driver-core: pr_err() strings should end with newlines 
pr_err() messages should terminated with a new-line to avoid
other messages being concatenated onto the end.

Signed-off-by: Arvind Yadav <arvind.yadav.cs@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2017-10-20 15:42:54 +02:00
Greg Kroah-Hartman
0e0d3d2c5f driver core: test_async: fix up typo found by 0-day 
0-day pointed out a typo in the platform device registration logic, so
fix it.

Reported-by: kbuild test robot <fengguang.wu@intel.com>
Cc: Guenter Roeck <groeck@chromium.org>
Cc: Dmitry Torokhov <dtor@chromium.org>
Cc: Julia Lawall <julia.lawall@lip6.fr>
Cc: Thierry Escande <thierry.escande@collabora.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2016-11-29 22:06:42 +01:00
Julia Lawall
2eed70ded4 driver-core: fix platform_no_drv_owner.cocci warnings 
Remove .owner field initialization as the core will do it.

Generated by: scripts/coccinelle/api/platform_no_drv_owner.cocci

CC: Dmitry Torokhov <dtor@chromium.org>
Signed-off-by: Julia Lawall <julia.lawall@lip6.fr>
Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2016-11-29 20:58:31 +01:00
Dmitry Torokhov
79543cf2b1 driver-core: add test module for asynchronous probing 
This test module tries to test asynchronous driver probing by having a
driver that sleeps for an extended period of time (5 secs) in its
probe() method. It measures the time needed to register this driver
(with device already registered) and a new device (with driver already
registered). The module will fail to load if the time spent in register
call is more than half the probing sleep time.

As a sanity check the driver will then try to synchronously register
driver and device and fail if registration takes less than half of the
probing sleep time.

Signed-off-by: Dmitry Torokhov <dtor@chromium.org>
Reviewed-by: Olof Johansson <olofj@chromium.org>
Signed-off-by: Guenter Roeck <groeck@chromium.org>
Signed-off-by: Thierry Escande <thierry.escande@collabora.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2016-11-10 17:28:16 +01:00