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* Documentation/watchdog: Add documentation mlx-wdt driverMichael Shych2019-03-021-0/+52
| | | | | | | | | Add documentation with details of Mellanox watchdog driver. Signed-off-by: Michael Shych <michaelsh@mellanox.com> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
* watchdog: docs: kernel-api: don't reference removed functionsWolfram Sang2018-12-241-4/+0
| | | | | | | | | | Those functions are not only deprecated, but gone for good. Fixes: 62cd1c40ce1c ("watchdog: kill unref/ref ops") Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
* watchdog: add documentation for PM usageWolfram Sang2018-12-241-0/+19
| | | | | | | | | Add the first rule we recently agreed on. Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
* documentation: watchdog: add documentation for armada-37xx-wdtMarek Behún2018-10-131-0/+5
| | | | | | | | | | Add documentation for the kernel module parameters accepted by armada-37xx-wdt. Signed-off-by: Marek Behún <marek.behun@nic.cz> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
* watchdog: hpwdt: Update Driver Documentation.Jerry Hoemann2018-10-021-62/+31
| | | | | | | | | | | | | Remove references to deprecated features like NMI sourcing and obsoleted module parameters. Add details concerning new module parameter pretimeout and tips to programming it. Signed-off-by: Jerry Hoemann <jerry.hoemann@hpe.com> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
* watchdog: remove bfin_wdt driverArnd Bergmann2018-03-261-5/+0
| | | | | | | | | The blackfin architecture is getting removed, so this driver has become obsolete. Acked-by: Guenter Roeck <linux@roeck-us.net> Acked-by: Aaron Wu <aaron.wu@analog.com> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
* documentation: watchdog: remove documentation of w83697hf_wdt/w83697ug_wdtCorentin Labbe2018-02-031-13/+0
| | | | | | | | | | | Since w83697hf_wdt/w83697ug_wdt watchdogs drivers were removed in commit 7285fae9345e ("watchdog: Remove drivers for W83697HF and W83697UG") There are no need to keep their documentation Signed-off-by: Corentin Labbe <clabbe@baylibre.com> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
* documentation: watchdog: remove documentation for ixp2000Corentin Labbe2018-02-031-5/+0
| | | | | | | | | | | The ixp2000 watchdog driver was removed in commit 065e8238302b ("watchdog: remove ixp2000 driver") No need to keep its documentation, so remove it. Signed-off-by: Corentin Labbe <clabbe@baylibre.com> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
* documentation: watchdog: remove documentation of at32ap700x_wdtCorentin Labbe2018-02-031-5/+0
| | | | | | | | | Since at32ap700x_wdt is gone, no need to keep its documentation Signed-off-by: Corentin Labbe <clabbe@baylibre.com> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
* Documentation: fix selftests related file refsTom Saeger2017-10-192-2/+2
| | | | | | | | | Make refs to selftests files valid including: - watchdog-test.c - dnotify_test.c Signed-off-by: Tom Saeger <tom.saeger@oracle.com> Signed-off-by: Jonathan Corbet <corbet@lwn.net>
* watchdog: Revert "iTCO_wdt: all versions count down twice"Wim Van Sebroeck2017-09-091-1/+1
| | | | | | | This reverts commit 1fccb73011ea8a5fa0c6d357c33fa29c695139ea. Reported as Bug 196509 - iTCO_wdt regression reboot before timeout expire Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
* watchdog: uniphier: add UniPhier watchdog driverKeiji Hayashibara2017-07-031-0/+6
| | | | | | | | | | | Add a watchdog driver for Socionext UniPhier series SoC. Note that the timeout value for this device must be a power of 2 because of the specification. Signed-off-by: Keiji Hayashibara <hayashibara.keiji@socionext.com> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
* iTCO_wdt: all versions count down twicePaolo Bonzini2017-05-191-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | The ICH9 is listed as having TCO v2, and indeed the behavior in the datasheet corresponds to v2 (for example the NO_REBOOT flag is accessible via the 16KiB-aligned Root Complex Base Address). However, the TCO counts twice just like in v1; the documentation of the SECOND_TO_STS bit says: "ICH9 sets this bit to 1 to indicate that the TIMEOUT bit had been (or is currently) set and a second timeout occurred before the TCO_RLD register was written. If this bit is set and the NO_REBOOT config bit is 0, then the ICH9 will reboot the system after the second timeout. The same can be found in the BayTrail (Atom E3800) datasheet, and even HOWTOs around the Internet say that it will reboot after _twice_ the specified heartbeat. I did not find the Apollo Lake datasheet, but because v4/v5 has a SECOND_TO_STS bit just like the previous version I'm enabling this for Apollo Lake as well. Cc: linux-watchdog@vger.kernel.org Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
* watchdog: Introduce watchdog_stop_on_unregister helperGuenter Roeck2017-02-241-0/+6
| | | | | | | | | | Many watchdog drivers explicitly stop the watchdog when unregistering it. While it is unclear if this is actually needed (the whatdog should not be running at that time if it can be stopped), introduce a helper to explicitly stop the watchdog in the watchdog core when unregistering it. This helps reducing driver code size while retaining functionality. Signed-off-by: Guenter Roeck <linux@roeck-us.net>
* watchdog: nic7018_wdt: Add NIC7018 watchdog driverHui Chun Ong2017-02-241-0/+5
| | | | | | | | Add support for the watchdog timer on PXI Embedded Controller. Signed-off-by: Hui Chun Ong <hui.chun.ong@ni.com> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
* docs: fix locations of several documents that got movedMauro Carvalho Chehab2016-10-242-2/+2
| | | | | | | | The previous patch renamed several files that are cross-referenced along the Kernel documentation. Adjust the links to point to the right places. Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
* Merge tag 'linux-kselftest-4.9-rc1-update' of ↵Linus Torvalds2016-10-147-139/+2
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest Pull kselftest updates from Shuah Khan: "This update consists of: - Fixes and improvements to existing tests - Moving code from Documentation to selftests, samples, and tools: * Moves dnotify_test, prctl, ptp, vDSO, ia64, watchdog, and networking tests from Documentation to selftests. * Moves mic/mpssd, misc-devices/mei, timers, watchdog, auxdisplay, and blackfin examples from Documentation to samples. * Moves accounting, laptops/dslm, and pcmcia/crc32hash tools from Documentation to tools. * Deletes BUILD_DOCSRC and its dependencies" * tag 'linux-kselftest-4.9-rc1-update' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest: (21 commits) selftests/futex: Check ANSI terminal color support Doc: update 00-INDEX files to reflect the runnable code move samples: move blackfin gptimers-example from Documentation tools: move pcmcia crc32hash tool from Documentation tools: move laptops dslm tool from Documentation tools: move accounting tool from Documentation samples: move auxdisplay example code from Documentation samples: move watchdog example code from Documentation samples: move timers example code from Documentation samples: move misc-devices/mei example code from Documentation samples: move mic/mpssd example code from Documentation selftests: Move networking/timestamping from Documentation selftests: move watchdog tests from Documentation/watchdog selftests: move ia64 tests from Documentation/ia64 selftests: move vDSO tests from Documentation/vDSO selftests: move ptp tests from Documentation/ptp selftests: move prctl tests from Documentation/prctl selftests: move dnotify_test from Documentation/filesystems selftests/timers: Add missing error code assignment before test selftests/zram: replace ZRAM_LZ4_COMPRESS ...
| * samples: move watchdog example code from DocumentationShuah Khan2016-09-236-33/+2
| | | | | | | | | | | | | | | | | | | | | | Move watchdog examples to samples and remove it from Documentation Makefile. Create a new Makefile to build watchdog. It can be built from top level directory or from watchdog directory: Run make -C samples/watchdog or cd samples/watchdog; make Acked-by: Jonathan Corbet <corbet@lwn.net> Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>
| * selftests: move watchdog tests from Documentation/watchdogShuah Khan2016-09-203-107/+1
| | | | | | | | | | | | | | | | | | | | | | Remove watchdog-test from Makefile to move the test to selftests. Add Makefile and .gitignore for watchdog-test. watchdog-test will not be run as part of selftests suite and will not be included in install targets. It can be built separately for now. Acked-by: Jonathan Corbet <corbet@lwn.net> Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>
* | watchdog: add watchdog pretimeout governor frameworkVladimir Zapolskiy2016-10-081-0/+13
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The change adds a simple watchdog pretimeout framework infrastructure, its purpose is to allow users to select a desired handling of watchdog pretimeout events, which may be generated by some watchdog devices. A user selects a default watchdog pretimeout governor during compilation stage. Watchdogs with WDIOF_PRETIMEOUT capability now have one more device attribute in sysfs, pretimeout_governor attribute is intended to display the selected watchdog pretimeout governor. The framework has no impact at runtime on watchdog devices with no WDIOF_PRETIMEOUT capability set. Signed-off-by: Vladimir Zapolskiy <vladimir_zapolskiy@mentor.com> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Tested-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
* | watchdog: add pretimeout support to the coreWolfram Sang2016-09-241-0/+20
|/ | | | | | | | | | | | | | Since the watchdog framework centrializes the IOCTL interfaces of device drivers now, SETPRETIMEOUT and GETPRETIMEOUT need to be added in the common code. Signed-off-by: Robin Gong <b38343@freescale.com> Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com> [vzapolskiy: added conditional pretimeout sysfs attribute visibility] Signed-off-by: Vladimir Zapolskiy <vladimir_zapolskiy@mentor.com> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
* Documentation/watchdog: check return value for magic closeArnd Bergmann2016-07-251-3/+11
| | | | | | | | | | | | | | | | A recent commit added a write to the watchdog test code for doing the "magic close", but that caused a compile-time warning: Documentation/watchdog/src/watchdog-test.c: In function ‘main’: Documentation/watchdog/src/watchdog-test.c:94:5: warning: ignoring return value of ‘write’, declared with attribute warn_unused_result [-Wunused-result] This changes the code to print a runtime warning if the write fails. Fixes: 5a2d3de19602 ("Documentation/watchdog: add support for magic close to watchdog-test") Signed-off-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Timur Tabi <timur@codeaurora.org> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
* watchdog: Implement status function in watchdog coreGuenter Roeck2016-07-191-0/+4
| | | | | | | | | | | | | | | | | | | | Up to now, the watchdog status function called a driver function, which was supposed to return the watchdog status. All but one driver using the watchdog core did not implement this function, and the driver implementing it did not implement it correctly (the function is supposed to return WDIOF_ flags). At the same time, at least some of the status information can be provided by the watchdog core. Provide the available status bits directly from the watchdog driver core. Call the driver status function if it exists to get the boot status, but always provide WDIOF_MAGICCLOSE and WDIOF_KEEPALIVEPING internally. This patch makes the 'status' sysfs attribute always available. This attribute is now displayed as hex number with 0x prepended to be easier to decode. Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
* Documentation/watchdog: add support for magic close to watchdog-testTimur Tabi2016-07-171-0/+3
| | | | | | | | | | | Some drivers have the WDIOF_MAGICCLOSE set, which means that applications need to write 'V' to the watchdog device before closing, otherwise the driver won't stop the watchdog timer. Signed-off-by: Timur Tabi <timur@codeaurora.org> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
* Documentation/watchdog: use stdout instead of stderr in watchdog-testTimur Tabi2016-07-171-16/+12
| | | | | | | | | | | | | | | | The watchdog-test utility outputs all messages to stderr, even those that are not error messages. Output to stdout instead. Instead of flushing the output after every write, just disabled the output buffer. Also display a dot for every ping of the watchdog, so that the user knows that it's working. Signed-off-by: Timur Tabi <timur@codeaurora.org> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
* watchdog: Improve description of min_hw_heartbeat_msGuenter Roeck2016-07-171-2/+3
| | | | | | | | The description of min_hw_heartbeat_ms is misleading and needs some improvements. Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
* watchdog: hpwdt: remove email address from docBrian Boylston2016-07-171-3/+2
| | | | | | | | | Remove Tom's email address from the documentation Signed-off-by: Brian Boylston <brian.boylston@hpe.com> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
* Documentation: Add ebc-c384_wdt watchdog-parameters.txt entryWilliam Breathitt Gray2016-05-141-0/+4
| | | | | | | | | | The WinSystems EBC-C384 watchdog timer driver supports two module parameters: timeout and nowayout. These parameters should be documented in the watchdog-parameters.txt file. Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
* watchdog: hpwdt: Adjust documentation to match latest kernel module parameters.Nigel Croxon2016-05-141-27/+30
| | | | | | | | Adjust documentation to match latest kernel module parameters. Signed-off-by: Nigel Croxon <nigel.croxon@hpe.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
* Merge git://www.linux-watchdog.org/linux-watchdogLinus Torvalds2016-03-192-12/+59
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Pull watchdog updates from Wim Van Sebroeck: - new drivers for: NI 903x/913x watchdog driver, WinSystems EBC-C384 watchdog timer and ARM SBSA watchdog driver - Support for NCT6102D devices - Improvements of the generic watchdog framework (improve restart handler, make set_timeout optional, introduce infrastructure triggered keepalives, ... - improvements on the pnx4008 watchdog driver - several smaller fixes and improvements * git://www.linux-watchdog.org/linux-watchdog: (28 commits) watchdog: Ensure that wdd is not dereferenced if NULL watchdog: imx2: Convert to use infrastructure triggered keepalives watchdog: dw_wdt: Convert to use watchdog infrastructure watchdog: Add support for minimum time between heartbeats watchdog: Make stop function optional watchdog: Introduce WDOG_HW_RUNNING flag watchdog: Introduce hardware maximum heartbeat in watchdog core watchdog: Make set_timeout function optional arm: lpc32xx: remove restart handler arm: lpc32xx: phy3250 remove restart hook watchdog: pnx4008: restart: support "cmd" from userspace watchdog: pnx4008: add support for soft reset watchdog: pnx4008: add restart handler watchdog: pnx4008: update logging during power-on watchdog: tangox_wdt: test clock rate to avoid division by 0 watchdog: atlas7_wdt: test clock rate to avoid division by 0 watchdog: s3c2410_wdt: Add max and min timeout values Watchdog: introduce ARM SBSA watchdog driver Documentation: add sbsa-gwdt driver documentation watchdog: Add watchdog timer support for the WinSystems EBC-C384 ...
| * watchdog: Add support for minimum time between heartbeatsGuenter Roeck2016-03-161-0/+3
| | | | | | | | | | | | | | | | Some watchdogs require a minimum time between heartbeats. Examples are the watchdogs in DA9062 and AT91SAM9x. Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
| * watchdog: Make stop function optionalGuenter Roeck2016-03-161-8/+12
| | | | | | | | | | | | | | | | | | | | Not all hardware watchdogs can be stopped. The driver for such watchdogs would typically only set the WATCHDOG_HW_RUNNING flag in its stop function. Make the stop function optional and set WATCHDOG_HW_RUNNING in the watchdog core if it is not provided. Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
| * watchdog: Introduce WDOG_HW_RUNNING flagGuenter Roeck2016-03-161-7/+15
| | | | | | | | | | | | | | | | | | | | | | | | | | | | The WDOG_HW_RUNNING flag is expected to be set by watchdog drivers if the hardware watchdog is running. If the flag is set, the watchdog subsystem will ping the watchdog even if the watchdog device is closed. The watchdog driver stop function is now optional and may be omitted if the watchdog can not be stopped. If stopping the watchdog is not possible but the driver implements a stop function, it is responsible to set the WDOG_HW_RUNNING flag in its stop function. Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
| * watchdog: Introduce hardware maximum heartbeat in watchdog coreGuenter Roeck2016-03-161-2/+17
| | | | | | | | | | | | | | | | | | | | | | | | | | Introduce an optional hardware maximum heartbeat in the watchdog core. The hardware maximum heartbeat can be lower than the maximum timeout. Drivers can set the maximum hardware heartbeat value in the watchdog data structure. If the configured timeout exceeds the maximum hardware heartbeat, the watchdog core enables a timer function to assist sending keepalive requests to the watchdog driver. Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
| * watchdog: Make set_timeout function optionalGuenter Roeck2016-03-161-0/+5
| | | | | | | | | | | | | | | | | | | | | | | | | | For some watchdogs, the watchdog driver handles timeout changes without explicitly setting any registers. In this situation, the watchdog driver might only set the 'timeout' variable but do nothing else. This can as well be handled by the infrastructure, so make the set_timeout callback optional. If WDIOF_SETTIMEOUT is configured but the .set_timeout callback is not available, update the timeout variable in the infrastructure code. Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
| * Documentation: add sbsa-gwdt driver documentationFu Wei2016-03-041-0/+7
| | | | | | | | | | | | | | | | | | | | | | | | | | | | The sbsa-gwdt.txt documentation in devicetree/bindings/watchdog is for introducing SBSA(Server Base System Architecture) Generic Watchdog device node info into FDT. Also add sbsa-gwdt introduction in watchdog-parameters.txt Acked-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Rob Herring <robh@kernel.org> Signed-off-by: Fu Wei <fu.wei@linaro.org> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
| * watchdog: ni903x_wdt: Add NI 903x/913x watchdog driverKyle Roeschley2016-03-011-0/+5
| | | | | | | | | | | | | | | | | | | | Add support for the watchdog timer on NI cRIO-903x and cDAQ-913x real- time controllers. Signed-off-by: Jeff Westfahl <jeff.westfahl@ni.com> Signed-off-by: Kyle Roeschley <kyle.roeschley@ni.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
* | Add sun4v_wdt watchdog driverwim.coekaerts@oracle.com2016-01-311-0/+4
|/ | | | | | | | | | | | This driver adds sparc hypervisor watchdog support. The default timeout is 60 seconds and the range is between 1 and 31536000 seconds. Both watchdog-resolution and watchdog-max-timeout MD properties settings are supported. Signed-off-by: Wim Coekaerts <wim.coekaerts@oracle.com> Reviewed-by: Julian Calaby <julian.calaby@gmail.com> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: David S. Miller <davem@davemloft.net>
* watchdog: Drop pointer to watchdog device from struct watchdog_deviceGuenter Roeck2016-01-111-2/+0
| | | | | | | | | The lifetime of the watchdog device pointer is different from the lifetime of its character device. Remove it entirely to avoid race conditions. Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
* watchdog: Add support for creating driver specific sysfs attributesGuenter Roeck2016-01-111-0/+3
| | | | | | | | | | | | | | | | The Zodiac watchdog driver attaches additional sysfs attributes to the watchdog device. This has a number of problems: The watchdog device lifetime differs from the driver lifetime, and the device structure should therefore not be accessed from drivers. Also, creating sysfs attributes after driver registration results in a potential race condition if user space expects the attributes to exist but they don't exist yet. Add support for creating driver specific sysfs attributes to the watchdog core to solve the problems. Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
* watchdog: Separate and maintain variables based on variable lifetimeGuenter Roeck2015-12-291-38/+7
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | All variables required by the watchdog core to manage a watchdog are currently stored in struct watchdog_device. The lifetime of those variables is determined by the watchdog driver. However, the lifetime of variables used by the watchdog core differs from the lifetime of struct watchdog_device. To remedy this situation, watchdog drivers can implement ref and unref callbacks, to be used by the watchdog core to lock struct watchdog_device in memory. While this solves the immediate problem, it depends on watchdog drivers to actually implement the ref/unref callbacks. This is error prone, often not implemented in the first place, or not implemented correctly. To solve the problem without requiring driver support, split the variables in struct watchdog_device into two data structures - one for variables associated with the watchdog driver, one for variables associated with the watchdog core. With this approach, the watchdog core can keep track of its variable lifetime and no longer depends on ref/unref callbacks in the driver. As a side effect, some of the variables originally in struct watchdog_driver are now private to the watchdog core and no longer visible in watchdog drivers. As a side effect of the changes made, an ioctl will now always fail with -ENODEV after a watchdog device was unregistered with the character device still open. Previously, it would only fail with -ENODEV in some situations. Also, ioctl operations are now atomic from driver perspective. With this change, it is now guaranteed that the driver will not unregister a watchdog between a timeout change and the subsequent ping. The 'ref' and 'unref' callbacks in struct watchdog_driver are no longer used and marked as deprecated. Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
* watchdog: core: add reboot notifier supportDamien Riegel2015-12-131-0/+8
| | | | | | | | | | | | | | | | | | | | | | Many watchdog drivers register a reboot notifier in order to stop the watchdog on system reboot. Thus we can factorize this code in the watchdog core. For that purpose, a new notifier block is added in watchdog_device for internal use only, as well as a new watchdog_stop_on_reboot helper function. If this helper is called, watchdog core registers the related notifier block and will stop the watchdog when SYS_HALT or SYS_DOWN is received. Since this operation can be critical on some platforms, abort the device registration if the reboot notifier registration fails. Suggested-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com> Signed-off-by: Damien Riegel <damien.riegel@savoirfairelinux.com> Reviewed-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
* watchdog: core: add restart handler supportDamien Riegel2015-12-131-0/+19
| | | | | | | | | | | | | | | | Many watchdog drivers implement the same code to register a restart handler. This patch provides a generic way to set such a function. The patch adds a new restart watchdog operation. If a restart priority greater than 0 is needed, the driver can call watchdog_set_restart_priority to set it. Suggested-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com> Signed-off-by: Damien Riegel <damien.riegel@savoirfairelinux.com> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Reviewed-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
* Documentation/watchdog: add timeout and ping rate control to watchdog-test.cTimur Tabi2015-09-091-5/+17
| | | | | | | | | | | | The watchdog test program is much more useful if it can configure the timeout value and ping rate. This will allow you to test actual timeouts. Adds the -t parameter to set the timeout value (in seconds), and -p to set the ping rate (number of seconds between pings). Signed-off-by: Timur Tabi <timur@codeaurora.org> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
* watchdog: omap_wdt: early_enable module parameterLars Poeschel2015-07-011-0/+1
| | | | | | | | | | | Add a early_enable module parameter to the omap_wdt that starts the watchdog on module insertion. The default value is 0 which does not start the watchdog - which also does not change the behavior if the parameter is not given. Signed-off-by: Lars Poeschel <poeschel@lemonage.de> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
* watchdog: watchdog_core: Add watchdog registration deferral mechanismJean-Baptiste Theou2015-06-291-0/+7
| | | | | | | | | | | | | Currently, watchdog subsystem require the misc subsystem to register a watchdog. This may not be the case in case of an early registration of a watchdog, which can be required when the watchdog cannot be disabled. This patch introduces a deferral mechanism to remove this requirement. Signed-off-by: Jean-Baptiste Theou <jtheou@adeneo-embedded.us> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
* watchdog: docs: omap_wdt also understands nowayoutLars Poeschel2015-06-221-0/+2
| | | | | | | | | The omap_wdt kernel driver also understands the nowayout module parameter. This updates the watchdog-parameters.txt to reflect this fact. Signed-off-by: Lars Poeschel <poeschel@lemonage.de> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
* Documentation: use subdir-y to avoid unnecessary built-in.o filesPeter Foley2014-09-262-3/+1
| | | | | | | | | | | Change the Documentation makefiles from obj-m to subdir-y to avoid generating unnecessary built-in.o files since nothing in Documentation/ is ever linked in to vmlinux. Signed-off-by: Peter Foley <pefoley2@pefoley.com> Acked-by: Sam Ravnborg <sam@ravnborg.org> Signed-off-by: Randy Dunlap <rdunlap@infradead.org> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
* Documentation: fix two typos in watchdog-api.txtSangjung Woo2014-08-051-1/+1
| | | | | | | | | | This patch changes 'go of' to 'go off' and 'pretimout' to 'pretimeout'. Signed-off-by: Sangjung Woo <sangjung.woo@samsung.com> Acked-by: Randy Dunlap <rdunlap@infradead.org> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
* watchdog: it87_wdt: Work around non-working CIR interruptsMarc van der Wal2014-03-311-0/+2
| | | | | | | | | | | | | | | | | | | | | | | | On some hardware platforms, the it87_wdt watchdog resets the machine despite the watchdog daemon running and writing to /dev/watchdog. This is due to Consumer IR buffer underrun interrupts being used as triggers to reset the timer. On some buggy hardware implementations such as the iEi AFL-12A-N270 single-board computer, this method does not work. However, resetting the timer by writing its original timeout value in its configuration register over and over again suppresses the unwanted reboots. Add a module option (nocir), 0 by default in order not to break existing setups. Setting it to 1 enables the workaround. Fixes bug #42801 <https://bugzilla.kernel.org/show_bug.cgi?id=42801>. Tested primarily on Linux 3.5.7, applies cleanly on Linux 3.13.5. Signed-off-by: Marc van der Wal <x0r+kernel@x0r.fr> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
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