From: Daniel Lezcano <daniel.lezcano@linaro.org> To: Andrzej Pietrasiewicz <andrzej.p@collabora.com>, linux-pm@vger.kernel.org Cc: Zhang Rui <rui.zhang@intel.com>, "Rafael J . Wysocki" <rjw@rjwysocki.net>, Len Brown <lenb@kernel.org>, Jiri Pirko <jiri@mellanox.com>, Ido Schimmel <idosch@mellanox.com>, "David S . Miller" <davem@davemloft.net>, Peter Kaestle <peter@piie.net>, Darren Hart <dvhart@infradead.org>, Andy Shevchenko <andy@infradead.org>, Support Opensource <support.opensource@diasemi.com>, Amit Kucheria <amit.kucheria@verdurent.com>, Shawn Guo <shawnguo@kernel.org>, Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix Kernel Team <kernel@pengutronix.de>, Fabio Estevam <festevam@gmail.com>, NXP Linux Team <linux-imx@nxp.com>, Allison Randal <allison@lohutok.net>, Enrico Weigelt <info@metux.net>, Gayatri Kammela <gayatri.kammela@intel.com>, Thomas Gleixner <tglx@linutronix.de>, linux-acpi@vger.kernel.org, netdev@vger.kernel.org, platform-driver-x86@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kernel@collabora.com Subject: Re: [RFC 0/8] Stop monitoring disabled devices Date: Thu, 9 Apr 2020 12:29:35 +0200 Message-ID: <2bc5a902-acde-526a-11a5-2357d899916c@linaro.org> (raw) In-Reply-To: <20200407174926.23971-1-andrzej.p@collabora.com> On 07/04/2020 19:49, Andrzej Pietrasiewicz wrote: > The current kernel behavior is to keep polling the thermal zone devices > regardless of their current mode. This is not desired, as all such "disabled" > devices are meant to be handled by userspace,> so polling them makes no sense. Thanks for proposing these changes. I've been (quickly) through the series and the description below. I have the feeling the series makes more complex while the current code which would deserve a cleanup. Why not first: - Add a 'mode' field in the thermal zone device - Kill all set/get_mode callbacks in the drivers which are duplicated code. - Add a function: enum thermal_device_mode thermal_zone_get_mode( *tz) { ... if (tz->ops->get_mode) return tz->ops->get_mode(); return tz->mode; } int thermal_zone_set_mode(..*tz, enum thermal_device_mode mode) { ... if (tz->ops->set_mode) return tz->ops->set_mode(tz, mode); tz->mode = mode; return 0; } static inline thermal_zone_enable(... *tz) { thermal_zone_set_mode(tz, THERMAL_DEVICE_ENABLED); } static inline thermal_zone_disable(... *tz) { thermal_zone_set_mode(tz, THERMAL_DEVICE_DISABLED); } And then when the code is consolidated, use the mode to enable/disable the polling and continue killing the duplicated code in of-thermal.c and anywhere else. > There was an attempt to solve this issue: > > https://lkml.org/lkml/2018/2/26/498 > > and it ultimately has not succeeded: > > https://lkml.org/lkml/2018/2/27/910 > > This is a new attempt addressing all the relevant drivers, and I have > identified them with: > > $ git grep "thermal_zone_device_ops" | grep "= {" | cut -f1 -d: | sort | uniq > > The idea is to modify thermal_zone_device_update() and monitor_thermal_zone() > in such a way that they stop polling a disabled device. To do decide what to > do they should call ->get_mode() operation of the specialized thermal zone > device in question (e.g. drivers/acpi/thermal.c's). But here comes problem: > sometimes a thermal zone device must be initially disabled and becomes enabled > only after its sensors appear on the system. If such thermal zone's > ->get_mode() /* in the context of thermal_zone_device_update() or > monitor_thermal_zone() */ is called _before_ the sensors are available, it will > be reported as "disabled" and consequently polling it will be ceased. This is > a change in behavior from userspace's perspective. > > To solve the above described problem I want to introduce the third mode of a > thermal_zone_device: initial. The idea is that when the device is in its > initial mode, then its polling will be handled as it is now. This is a good > thing: should the temperature be just about hitting the critical treshnold > early during the boot process, it might be too late if we wait for the > userspace to run to save the system from overheating. The initial mode should > be reported in sysfs as "enabled" to keep the userspace interface intact. > From the initial mode there will be two possible transitions: to enabled or > disabled mode, but there will be no transition back to initial. If the > transition is from initial to enabled, then keep polling. If the transition is > from initial to disabled, then stop polling. If the transition is from enabled > to disabled, then stop polling. The transition from disabled to enabled must > be handled in a special way: there must be a mandatory call to > monitor_thermal_zone(), otherwise the polling will not start. If this > transition is triggeted from sysfs, then it can be easily handled at the > thermal framework level. However, if drivers call their own ->set_mode() > operation then they must also call "monitor_thermal_zone()" afterwards. > The latter being a sensible thing anyway, so perhaps all/most of the drivers > in question do. The plan for implementation is this: > > - ensure ALL users use symbolic enum names (THERMAL_DEVICE_DISABLED, > THERMAL_DEVICE_ENABLED) for thermal device mode rather than the numeric > values of enum thermal_device_mode elements > - add THERMAL_DEVICE_INITIAL to the said enum making its value 0 (so that > kzalloc() results in the initial state) > - modify thermal zone device's mode_show() (thermal framework level) so that > it reports "enabled" for THERMAL_DEVICE_INITIAL > - modify thermal zone device's mode_store() (thermal framework level) so that > it calls monitor_thermal_zone() upon mode change > - modify ALL thermal drivers so that their code is prepared to return > THERMAL_DEVICE_INITIAL before they call thermal_zone_device_register(); when > the invocation of the latter completes then polling is expected to be started > - verify ALL drivers which call their own ->set_mode() to ensure they do call > monitor_thermal_zone() afterwards > - modify thermal_zone_device_update() and monitor_thermal_zone() so that they > cancel polling for disabled thermal zone devices (but not for those in > THERMAL_DEVICE_INITIAL mode) > > This RFC series does all the above steps in more or less that order. > > I kindly ask for comments/suggestions/improvements. > > Rebased onto v5.6. > > Andrzej Pietrasiewicz (8): > thermal: int3400_thermal: Statically initialize > .get_mode()/.set_mode() ops > thermal: Properly handle mode values in .set_mode() > thermal: Store thermal mode in a dedicated enum > thermal: core: Introduce THERMAL_DEVICE_INITIAL > thermal: core: Monitor thermal zone after mode change > thermal: Set initial state to THERMAL_DEVICE_INITIAL > thermal: of: Monitor thermal zone after enabling it > thermal: Stop polling DISABLED thermal devices > > drivers/acpi/thermal.c | 28 +++++----- > .../ethernet/mellanox/mlxsw/core_thermal.c | 11 +++- > drivers/platform/x86/acerhdf.c | 17 ++++-- > drivers/thermal/da9062-thermal.c | 2 +- > drivers/thermal/imx_thermal.c | 5 +- > .../intel/int340x_thermal/int3400_thermal.c | 24 ++++----- > .../thermal/intel/intel_quark_dts_thermal.c | 6 ++- > drivers/thermal/of-thermal.c | 9 +++- > drivers/thermal/thermal_core.c | 52 ++++++++++++++++++- > drivers/thermal/thermal_core.h | 2 + > drivers/thermal/thermal_sysfs.c | 12 +++-- > include/linux/thermal.h | 3 +- > 12 files changed, 123 insertions(+), 48 deletions(-) > -- <http://www.linaro.org/> Linaro.org │ Open source software for ARM SoCs Follow Linaro: <http://www.facebook.com/pages/Linaro> Facebook | <http://twitter.com/#!/linaroorg> Twitter | <http://www.linaro.org/linaro-blog/> Blog
next prev parent reply index Thread overview: 137+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-04-07 17:49 Andrzej Pietrasiewicz 2020-04-07 17:49 ` [RFC 1/8] thermal: int3400_thermal: Statically initialize .get_mode()/.set_mode() ops Andrzej Pietrasiewicz [not found] ` <CGME20200415091204eucas1p1983548c2db52d8d0c2a5367034ec80dd@eucas1p1.samsung.com> 2020-04-15 9:12 ` Bartlomiej Zolnierkiewicz 2020-04-07 17:49 ` [RFC 2/8] thermal: Properly handle mode values in .set_mode() Andrzej Pietrasiewicz [not found] ` <CGME20200415100543eucas1p24e24293da39844ca8791db86af5365a7@eucas1p2.samsung.com> 2020-04-15 10:05 ` Bartlomiej Zolnierkiewicz 2020-04-07 17:49 ` [RFC 3/8] thermal: Store thermal mode in a dedicated enum Andrzej Pietrasiewicz [not found] ` <CGME20200415100944eucas1p1dcfeb784e790ca2fc3417fd2797e3f5d@eucas1p1.samsung.com> 2020-04-15 10:09 ` Bartlomiej Zolnierkiewicz 2020-04-07 17:49 ` [RFC 4/8] thermal: core: Introduce THERMAL_DEVICE_INITIAL Andrzej Pietrasiewicz 2020-04-07 17:49 ` [RFC 5/8] thermal: core: Monitor thermal zone after mode change Andrzej Pietrasiewicz 2020-04-07 17:49 ` [RFC 6/8] thermal: Set initial state to THERMAL_DEVICE_INITIAL Andrzej Pietrasiewicz 2020-04-07 17:49 ` [RFC 7/8] thermal: of: Monitor thermal zone after enabling it Andrzej Pietrasiewicz [not found] ` <CGME20200415101829eucas1p18e21324d3c39926fffc6c8b5dc52f206@eucas1p1.samsung.com> 2020-04-15 10:18 ` Bartlomiej Zolnierkiewicz 2020-04-07 17:49 ` [RFC 8/8] thermal: Stop polling DISABLED thermal devices Andrzej Pietrasiewicz 2020-04-09 10:29 ` Daniel Lezcano [this message] 2020-04-09 11:10 ` [RFC 0/8] Stop monitoring disabled devices Andrzej Pietrasiewicz [not found] ` <CGME20200415104010eucas1p101278e53e34a2e56dfc7c82b533a9122@eucas1p1.samsung.com> 2020-04-15 10:40 ` Bartlomiej Zolnierkiewicz 2020-04-17 16:23 ` Andrzej Pietrasiewicz 2020-04-19 11:42 ` Bartlomiej Zolnierkiewicz 2020-04-17 21:11 ` Peter Kästle 2020-04-14 18:00 ` [RFC v2 0/9] " Andrzej Pietrasiewicz 2020-04-14 18:00 ` [RFC v2 1/9] thermal: int3400_thermal: Statically initialize .get_mode()/.set_mode() ops Andrzej Pietrasiewicz 2020-04-15 9:23 ` Daniel Lezcano 2020-04-14 18:00 ` [RFC v2 2/9] thermal: Eliminate an always-false condition Andrzej Pietrasiewicz 2020-04-14 18:00 ` [RFC v2 3/9] thermal: Properly handle mode values in .set_mode() Andrzej Pietrasiewicz 2020-04-14 22:14 ` Daniel Lezcano 2020-04-14 18:01 ` [RFC v2 4/9] thermal: core: Let thermal zone device's mode be stored in its struct Andrzej Pietrasiewicz 2020-04-14 22:30 ` Daniel Lezcano 2020-04-14 18:01 ` [RFC v2 5/9] thermal: Store mode in thermal_zone_device Andrzej Pietrasiewicz 2020-04-15 10:55 ` Daniel Lezcano 2020-04-17 16:20 ` [RFC v3 0/2] Stop monitoring disabled devices Andrzej Pietrasiewicz 2020-04-17 16:20 ` [RFC v3 1/2] thermal: core: Let thermal zone device's mode be stored in its struct Andrzej Pietrasiewicz 2020-04-17 20:44 ` Andy Shevchenko 2020-04-19 11:38 ` Bartlomiej Zolnierkiewicz 2020-04-19 13:10 ` Bartlomiej Zolnierkiewicz 2020-04-20 18:17 ` [PATCH 0/2] Stop monitoring disabled devices Andrzej Pietrasiewicz 2020-04-20 18:17 ` [PATCH 1/2] thermal: core: Let thermal zone device's mode be stored in its struct Andrzej Pietrasiewicz 2020-04-22 7:49 ` kbuild test robot 2020-04-22 17:14 ` Andrzej Pietrasiewicz 2020-04-22 17:03 ` kbuild test robot 2020-04-22 17:15 ` Andrzej Pietrasiewicz 2020-04-20 18:17 ` [PATCH 2/2] thermal: core: Stop polling DISABLED thermal devices Andrzej Pietrasiewicz 2020-04-22 16:12 ` [PATCH RESEND 1/2] thermal: core: Let thermal zone device's mode be stored in its struct Andrzej Pietrasiewicz 2020-04-23 14:39 ` Bartlomiej Zolnierkiewicz 2020-04-23 16:57 ` [PATCH v3 0/2] Stop monitoring disabled devices Andrzej Pietrasiewicz 2020-04-23 16:57 ` [PATCH v3 1/2] thermal: core: Let thermal zone device's mode be stored in its struct Andrzej Pietrasiewicz 2020-05-04 7:00 ` Bartlomiej Zolnierkiewicz 2020-04-23 16:57 ` [PATCH v3 2/2] thermal: core: Stop polling DISABLED thermal devices Andrzej Pietrasiewicz 2020-04-24 9:03 ` Zhang, Rui 2020-04-27 14:20 ` Zhang, Rui 2020-04-27 18:34 ` Andrzej Pietrasiewicz 2020-04-28 13:55 ` Zhang, Rui 2020-04-20 11:03 ` [RFC v3 1/2] thermal: core: Let thermal zone device's mode be stored in its struct Andrzej Pietrasiewicz 2020-04-20 18:19 ` Andrzej Pietrasiewicz 2020-05-23 21:24 ` Daniel Lezcano 2020-05-25 19:35 ` Andrzej Pietrasiewicz 2020-05-25 22:08 ` Daniel Lezcano 2020-05-26 16:56 ` Andrzej Pietrasiewicz 2020-05-27 13:30 ` Bartlomiej Zolnierkiewicz 2020-04-17 16:20 ` [RFC v3 2/2] thermal: core: Stop polling DISABLED thermal devices Andrzej Pietrasiewicz 2020-04-19 13:50 ` [RFC v3 1/2] thermal: core: Let thermal zone device's mode be stored in its struct Peter Kästle 2020-04-14 18:01 ` [RFC v2 6/9] thermal: Remove get_mode() method Andrzej Pietrasiewicz 2020-04-14 18:01 ` [RFC v2 7/9] thermal: core: Monitor thermal zone after mode change Andrzej Pietrasiewicz 2020-04-14 18:01 ` [RFC v2 8/9] thermal: of: Monitor thermal zone after enabling it Andrzej Pietrasiewicz 2020-04-14 18:01 ` [RFC v2 9/9] thermal: core: Stop polling DISABLED thermal devices Andrzej Pietrasiewicz 2020-04-14 21:52 ` [RFC v2 0/9] Stop monitoring disabled devices Ezequiel Garcia [not found] <Message-ID: <4493c0e4-51aa-3907-810c-74949ff27ca4@samsung.com> 2020-05-28 19:20 ` [PATCH v4 00/11] " Andrzej Pietrasiewicz 2020-05-28 19:20 ` [PATCH v4 01/11] acpi: thermal: Fix error handling in the register function Andrzej Pietrasiewicz 2020-05-29 14:50 ` Guenter Roeck 2020-06-24 8:16 ` Bartlomiej Zolnierkiewicz 2020-05-28 19:20 ` [PATCH v4 02/11] thermal: Store thermal mode in a dedicated enum Andrzej Pietrasiewicz 2020-05-29 14:48 ` Guenter Roeck 2020-05-29 15:13 ` Andrzej Pietrasiewicz 2020-05-29 15:34 ` Guenter Roeck 2020-06-24 9:38 ` Bartlomiej Zolnierkiewicz 2020-05-28 19:20 ` [PATCH v4 03/11] thermal: Add current mode to thermal zone device Andrzej Pietrasiewicz 2020-05-29 14:51 ` Guenter Roeck 2020-06-24 9:39 ` Bartlomiej Zolnierkiewicz 2020-05-28 19:20 ` [PATCH v4 04/11] thermal: Store device mode in struct thermal_zone_device Andrzej Pietrasiewicz 2020-06-24 9:40 ` Bartlomiej Zolnierkiewicz 2020-05-28 19:20 ` [PATCH v4 05/11] thermal: remove get_mode() operation of drivers Andrzej Pietrasiewicz 2020-06-24 9:47 ` Bartlomiej Zolnierkiewicz 2020-05-28 19:20 ` [PATCH v4 06/11] thermal: Add mode helpers Andrzej Pietrasiewicz 2020-06-24 9:49 ` Bartlomiej Zolnierkiewicz 2020-05-28 19:20 ` [PATCH v4 07/11] thermal: Use mode helpers in drivers Andrzej Pietrasiewicz 2020-06-24 9:51 ` Bartlomiej Zolnierkiewicz 2020-06-26 16:08 ` Andrzej Pietrasiewicz 2020-05-28 19:20 ` [PATCH v4 08/11] thermal: Explicitly enable non-changing thermal zone devices Andrzej Pietrasiewicz 2020-06-24 10:00 ` Bartlomiej Zolnierkiewicz 2020-05-28 19:20 ` [PATCH v4 09/11] thermal: core: Stop polling DISABLED thermal devices Andrzej Pietrasiewicz 2020-06-24 10:02 ` Bartlomiej Zolnierkiewicz 2020-05-28 19:20 ` [PATCH v4 10/11] thermal: Simplify or eliminate unnecessary set_mode() methods Andrzej Pietrasiewicz 2020-06-24 10:03 ` Bartlomiej Zolnierkiewicz 2020-05-28 19:20 ` [PATCH v4 11/11] thermal: Rename set_mode() to change_mode() Andrzej Pietrasiewicz 2020-06-24 10:03 ` Bartlomiej Zolnierkiewicz 2020-06-01 11:36 ` [PATCH v4 02/11] thermal: Store thermal mode in a dedicated enum Peter Kästle 2020-06-01 11:36 ` [PATCH v4 04/11] thermal: Store device mode in struct thermal_zone_device Peter Kästle 2020-06-01 11:37 ` [PATCH v4 05/11] thermal: remove get_mode() operation of drivers Peter Kästle 2020-06-01 11:37 ` [PATCH v4 07/11] thermal: Use mode helpers in drivers Peter Kästle 2020-06-01 11:38 ` [PATCH v4 10/11] thermal: Simplify or eliminate unnecessary set_mode() methods Peter Kästle 2020-06-01 11:38 ` [PATCH v4 11/11] thermal: Rename set_mode() to change_mode() Peter Kästle 2020-06-23 14:37 ` [PATCH v4 00/11] Stop monitoring disabled devices Daniel Lezcano 2020-06-26 17:37 ` [PATCH v5 " Andrzej Pietrasiewicz 2020-06-26 17:37 ` [PATCH v5 01/11] acpi: thermal: Fix error handling in the register function Andrzej Pietrasiewicz 2020-06-29 7:19 ` Amit Kucheria 2020-06-26 17:37 ` [PATCH v5 02/11] thermal: Store thermal mode in a dedicated enum Andrzej Pietrasiewicz 2020-06-29 7:19 ` Amit Kucheria 2020-06-26 17:37 ` [PATCH v5 03/11] thermal: Add current mode to thermal zone device Andrzej Pietrasiewicz 2020-06-29 7:19 ` Amit Kucheria 2020-06-26 17:37 ` [PATCH v5 04/11] thermal: Store device mode in struct thermal_zone_device Andrzej Pietrasiewicz 2020-06-29 7:19 ` Amit Kucheria 2020-06-26 17:37 ` [PATCH v5 05/11] thermal: remove get_mode() operation of drivers Andrzej Pietrasiewicz 2020-06-29 7:20 ` Amit Kucheria 2020-06-26 17:37 ` [PATCH v5 06/11] thermal: Add mode helpers Andrzej Pietrasiewicz 2020-06-26 20:50 ` kernel test robot 2020-06-26 20:50 ` [RFC PATCH] thermal: thermal_zone_device_set_mode() can be static kernel test robot 2020-06-26 20:55 ` [PATCH v5 06/11] thermal: Add mode helpers kernel test robot 2020-06-29 7:04 ` Amit Kucheria 2020-06-29 11:16 ` [PATCH v6 00/11] Stop monitoring disabled devices Andrzej Pietrasiewicz 2020-06-29 11:16 ` [PATCH v6 01/11] acpi: thermal: Fix error handling in the register function Andrzej Pietrasiewicz 2020-06-29 11:16 ` [PATCH v6 02/11] thermal: Store thermal mode in a dedicated enum Andrzej Pietrasiewicz 2020-06-29 11:16 ` [PATCH v6 03/11] thermal: Add current mode to thermal zone device Andrzej Pietrasiewicz 2020-06-29 11:16 ` [PATCH v6 04/11] thermal: Store device mode in struct thermal_zone_device Andrzej Pietrasiewicz 2020-06-29 11:16 ` [PATCH v6 05/11] thermal: remove get_mode() operation of drivers Andrzej Pietrasiewicz 2020-06-29 11:16 ` [PATCH v6 06/11] thermal: Add mode helpers Andrzej Pietrasiewicz 2020-06-29 12:08 ` Daniel Lezcano 2020-06-29 11:16 ` [PATCH v6 07/11] thermal: Use mode helpers in drivers Andrzej Pietrasiewicz 2020-06-29 11:16 ` [PATCH v6 08/11] thermal: Explicitly enable non-changing thermal zone devices Andrzej Pietrasiewicz 2020-06-29 11:16 ` [PATCH v6 09/11] thermal: core: Stop polling DISABLED thermal devices Andrzej Pietrasiewicz 2020-06-29 11:16 ` [PATCH v6 10/11] thermal: Simplify or eliminate unnecessary set_mode() methods Andrzej Pietrasiewicz 2020-06-29 11:16 ` [PATCH v6 11/11] thermal: Rename set_mode() to change_mode() Andrzej Pietrasiewicz 2020-06-26 17:37 ` [PATCH v5 07/11] thermal: Use mode helpers in drivers Andrzej Pietrasiewicz 2020-06-26 17:37 ` [PATCH v5 08/11] thermal: Explicitly enable non-changing thermal zone devices Andrzej Pietrasiewicz 2020-06-26 17:37 ` [PATCH v5 09/11] thermal: core: Stop polling DISABLED thermal devices Andrzej Pietrasiewicz 2020-06-26 17:37 ` [PATCH v5 10/11] thermal: Simplify or eliminate unnecessary set_mode() methods Andrzej Pietrasiewicz 2020-06-26 17:37 ` [PATCH v5 11/11] thermal: Rename set_mode() to change_mode() Andrzej Pietrasiewicz 2020-06-01 10:02 ` [PATCH v4 00/11] Stop monitoring disabled devices Peter Kästle 2020-06-01 10:20 ` Andrzej Pietrasiewicz
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