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2019-01-29ACPI: EC: Clean up probing for early ECRafael J. Wysocki1-2/+2
Both acpi_ec_dsdt_probe() and acpi_ec_ecdt_probe() may be void as their return values are ignored anyway. This allows a couple of gotos and labels to go away from there. Moreover, acpi_ec_ecdt_probe() only needs to allocate the ec object after getting the ECDT pointer and checking it, so the pointless memory allocation and release on systems without the ECDT can be avoided by reordering it. No intentional functional impact. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2019-01-16ACPI / LPSS: Make PCI dependency explicitSinan Kaya1-0/+4
After commit 5d32a66541c4 (PCI/ACPI: Allow ACPI to be built without CONFIG_PCI set), it is possible to build ACPI without any PCI support. This code depends on PCI. Compile only when PCI is present. Fixes: 5d32a66541c46 ("PCI/ACPI: Allow ACPI to be built without CONFIG_PCI set") Signed-off-by: Sinan Kaya <okaya@kernel.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2018-12-26Merge tag 'devprop-4.21-rc1' of ↵Linus Torvalds1-1/+0
git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm Pull device properties framework updates from Rafael Wysocki: "This introduces 'software nodes' that are analogous to the DT and ACPI firmware nodes except that they can be created by drivers themselves and do a couple of assorted cleanups. Specifics: - Introduce "software nodes", analogous to the DT and ACPI firmware nodes except that they can be created by kernel code, in order to complement fwnodes representing real firmware nodes when they are incomplete (for example missing device properties) and to supply the primary fwnode when the firmware lacks hardware description for a device completely, and replace the "property_set" struct fwnode_handle type with software nodes (Heikki Krogerus). - Clean up the just introduced software nodes support and fix a commet in the graph-handling code (Colin Ian King, Marco Felsch)" * tag 'devprop-4.21-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: device property: fix fwnode_graph_get_next_endpoint() documentation drivers: base: swnode: remove need for a temporary string for the node name device property: Remove struct property_set device property: Move device_add_properties() to swnode.c drivers: base: Introducing software nodes to the firmware node framework ACPI / glue: Add acpi_platform_notify() function drivers core: Prepare support for multiple platform notifications driver core: platform: Remove duplicated device_remove_properties() call
2018-12-26Merge tag 'acpi-4.21-rc1' of ↵Linus Torvalds1-0/+5
git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm Pull ACPI updates from Rafael Wysocki: "These update the ACPICA code in the kernel to the 20181213 upstream revision, make it possible to build the ACPI subsystem without PCI support, and a new OEM _OSI string, add a new device support to the ACPI driver for AMD SoCs and fix PM handling in the ACPI driver for Intel SoCs, fix the SPCR table handling and do some assorted fixes and cleanups. Specifics: - Update the ACPICA code in the kernel to the 20181213 upstream revision including: * New Windows _OSI strings (Bob Moore, Jung-uk Kim). * Buffers-to-string conversions update (Bob Moore). * Removal of support for expressions in package elements (Bob Moore). * New option to display method/object evaluation in debug output (Bob Moore). * Compiler improvements (Bob Moore, Erik Schmauss). * Minor debugger fix (Erik Schmauss). * Disassembler improvement (Erik Schmauss). * Assorted cleanups (Bob Moore, Colin Ian King, Erik Schmauss). - Add support for a new OEM _OSI string to indicate special handling of secondary graphics adapters on some systems (Alex Hung). - Make it possible to build the ACPI subystem without PCI support (Sinan Kaya). - Make the SPCR table handling regard baud rate 0 in accordance with the specification of it and make the DSDT override code support DSDT code names generated by recent ACPICA (Andy Shevchenko, Wang Dongsheng, Nathan Chancellor). - Add clock frequency for Hisilicon Hip08 SPI controller to the ACPI driver for AMD SoCs (APD) (Jay Fang). - Fix the PM handling during device init in the ACPI driver for Intel SoCs (LPSS) (Hans de Goede). - Avoid double panic()s by clearing the APEI GHES block_status before panic() (Lenny Szubowicz). - Clean up a function invocation in the ACPI core and get rid of some code duplication by using the DEFINE_SHOW_ATTRIBUTE macro in the APEI support code (Alexey Dobriyan, Yangtao Li)" * tag 'acpi-4.21-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (31 commits) ACPI / tables: Add an ifdef around amlcode and dsdt_amlcode ACPI/APEI: Clear GHES block_status before panic() ACPI: Make PCI slot detection driver depend on PCI ACPI/IORT: Stub out ACS functions when CONFIG_PCI is not set arm64: select ACPI PCI code only when both features are enabled PCI/ACPI: Allow ACPI to be built without CONFIG_PCI set ACPICA: Remove PCI bits from ACPICA when CONFIG_PCI is unset ACPI: Allow CONFIG_PCI to be unset for reboot ACPI: Move PCI reset to a separate function ACPI / OSI: Add OEM _OSI string to enable dGPU direct output ACPI / tables: add DSDT AmlCode new declaration name support ACPICA: Update version to 20181213 ACPICA: change coding style to match ACPICA, no functional change ACPICA: Debug output: Add option to display method/object evaluation ACPICA: disassembler: disassemble OEMx tables as AML ACPICA: Add "Windows 2018.2" string in the _OSI support ACPICA: Expressions in package elements are not supported ACPICA: Update buffer-to-string conversions ACPICA: add comments, no functional change ACPICA: Remove defines that use deprecated flag ...
2018-12-20PCI/ACPI: Allow ACPI to be built without CONFIG_PCI setSinan Kaya1-0/+5
We are compiling PCI code today for systems with ACPI and no PCI device present. Remove the useless code and reduce the tight dependency. Signed-off-by: Sinan Kaya <okaya@kernel.org> Acked-by: Bjorn Helgaas <bhelgaas@google.com> # PCI parts Acked-by: Ingo Molnar <mingo@kernel.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2018-12-18ACPI: EC / PM: Disable non-wakeup GPEs for suspend-to-idleRafael J. Wysocki1-0/+2
There are systems in which non-wakeup GPEs fire during the "noirq" suspend stage of suspending devices and that effectively prevents the system that tries to suspend to idle from entering any low-power state at all. If the offending GPE fires regularly and often enough, the system appears to be suspended, but in fact it is in a tight loop over "noirq" suspend and "noirq" resume of devices all the time. To prevent that from happening, disable all non-wakeup GPEs except for the EC GPE for suspend-to-idle (the EC GPE is special, because on some systems it has to be enabled for power button wakeup events to be generated as expected). Fixes: 147a7d9d25ca (ACPI / PM: Do not reconfigure GPEs for suspend-to-idle) Link: https://bugzilla.kernel.org/show_bug.cgi?id=201987 Reported-by: Zhang Rui <rui.zhang@intel.com> Tested-by: Mika Westerberg <mika.westerberg@linux.intel.com> Tested-by: Zhang Rui <rui.zhang@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2018-11-26ACPI / glue: Add acpi_platform_notify() functionHeikki Krogerus1-1/+0
Instead of relying on the "platform_notify" callback hook, introducing separate notification function acpi_platform_notify() and calling that directly from drivers core when device entries are added and removed. Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com> Acked-by: Linus Walleij <linus.walleij@linaro.org> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2018-05-25ACPI: EC: Dispatch the EC GPE directly on s2idle wakeRafael J. Wysocki1-0/+1
On platforms where the Low Power S0 Idle _DSM interface is used, on wakeup from suspend-to-idle, when it is known that the ACPI SCI has triggered while suspended, dispatch the EC GPE in order to catch all EC events that may have triggered the wakeup before carrying out the noirq phase of device resume. That is needed to handle power button wakeup on some platforms where the EC goes into a low-power mode during suspend-to-idle and while in that mode it will discard events after a timeout. If that timeout is shorter than the time it takes to complete the noirq resume of devices, looking for EC events after the latter is too late. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Reported-by: Zhang Rui <rui.zhang@intel.com> Tested-by: Wendy Wang <wendy.wang@intel.com>
2018-01-04ACPI: EC: Fix debugfs_create_*() usageGeert Uytterhoeven1-1/+1
acpi_ec.gpe is "unsigned long", hence treating it as "u32" would expose the wrong half on big-endian 64-bit systems. Fix this by changing its type to "u32" and removing the cast, as all other code already uses u32 or sometimes even only u8. Fixes: 1195a098168fcacf (ACPI: Provide /sys/kernel/debug/ec/...) Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2017-11-30Merge branch 'acpi-ec' into acpiRafael J. Wysocki1-0/+1
* acpi-ec: ACPI / EC: Fix regression related to PM ops support in ECDT device
2017-11-21ACPI / EC: Fix regression related to PM ops support in ECDT deviceLv Zheng1-0/+1
On platforms (ASUS X550ZE and possibly all ASUS X series) with valid ECDT EC but invalid DSDT EC, EC PM ops won't be invoked as ECDT EC is not an ACPI device. Thus the following commit actually removed post-resume acpi_ec_enable_event() invocation for such platforms, and triggered a regression on them that after being resumed, EC (actually should be ECDT) driver stops handling EC events: Commit: c2b46d679b30c5c0d7eb47a21085943242bdd8dc Subject: ACPI / EC: Add PM operations to improve event handling for resume process Notice that the root cause actually is "ECDT is not an ACPI device" rather than "the timing of acpi_ec_enable_event() invocation", this patch fixes this issue by enumerating ECDT EC as an ACPI device. Due to the existence of the noirq stage, the ability of tuning the timing of acpi_ec_enable_event() invocation is still meaningful. This patch is a little bit different from the posted fix by moving acpi_config_boot_ec() from acpi_ec_ecdt_start() to acpi_ec_add() to make sure that EC event handling won't be stopped as long as the ACPI EC driver is bound. Thus the following sequence shouldn't disable EC event handling: unbind,suspend,resume,bind. Fixes: c2b46d679b30 (ACPI / EC: Add PM operations to improve event handling for resume process) Link: https://bugzilla.kernel.org/show_bug.cgi?id=196847 Reported-by: Luya Tshimbalanga <luya@fedoraproject.org> Tested-by: Luya Tshimbalanga <luya@fedoraproject.org> Cc: 4.9+ <stable@vger.kernel.org> # 4.9+ Signed-off-by: Lv Zheng <lv.zheng@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2017-10-11ACPI / LPIT: Add Low Power Idle Table (LPIT) supportSrinivas Pandruvada1-0/+6
Add functionality to read LPIT table, which provides: - Sysfs interface to read residency counters via /sys/devices/system/cpu/cpuidle/low_power_idle_cpu_residency_us /sys/devices/system/cpu/cpuidle/low_power_idle_system_residency_us Here the count "low_power_idle_cpu_residency_us" shows the time spent by CPU package in low power state. This is read via MSR interface, which points to MSR for PKG C10. Here the count "low_power_idle_system_residency_us" show the count the system was in low power state. This is read via MMIO interface. This is mapped to SLP_S0 residency on modern Intel systems. This residency is achieved only when CPU is in PKG C10 and all functional blocks are in low power state. It is possible that none of the above counters present or anyone of the counter present or all counters present. For example: On my Kabylake system both of the above counters present. After suspend to idle these counts updated and prints: 6916179 6998564 This counter can be read by tools like turbostat to display. Or it can be used to debug, if modern systems are reaching desired low power state. - Provides an interface to read residency counter memory address This address can be used to get the base address of PMC memory mapped IO. This is utilized by intel_pmc_core driver to print more debug information. In addition, to avoid code duplication to read iomem, removed the read of iomem from acpi_os_read_memory() in osl.c and made a common function acpi_os_read_iomem(). This new function is used for reading iomem in in both osl.c and acpi_lpit.c. Link: http://www.uefi.org/sites/default/files/resources/Intel_ACPI_Low_Power_S0_Idle.pdf Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2017-09-04Merge branches 'acpi-x86', 'acpi-soc', 'acpi-pmic' and 'acpi-apple'Rafael J. Wysocki1-0/+6
* acpi-x86: ACPI / boot: Add number of legacy IRQs to debug output ACPI / boot: Correct address space of __acpi_map_table() ACPI / boot: Don't define unused variables * acpi-soc: ACPI / LPSS: Don't abort ACPI scan on missing mem resource * acpi-pmic: ACPI / PMIC: xpower: Do pinswitch magic when reading GPADC * acpi-apple: spi: Use Apple device properties in absence of ACPI resources ACPI / scan: Recognize Apple SPI and I2C slaves ACPI / property: Support Apple _DSM properties ACPI / property: Don't evaluate objects for devices w/o handle treewide: Consolidate Apple DMI checks
2017-08-17ACPI: EC: Fix regression related to wrong ECDT initialization orderLv Zheng1-1/+0
Commit 2a5708409e4e (ACPI / EC: Fix a gap that ECDT EC cannot handle EC events) introduced acpi_ec_ecdt_start(), but that function is invoked before acpi_ec_query_init(), which is too early. This causes the kernel to crash if an EC event occurs after boot, when ec_query_wq is not valid: BUG: unable to handle kernel NULL pointer dereference at 0000000000000102 ... Workqueue: events acpi_ec_event_handler task: ffff9f539790dac0 task.stack: ffffb437c0e10000 RIP: 0010:__queue_work+0x32/0x430 Normally, the DSDT EC should always be valid, so acpi_ec_ecdt_start() is actually a no-op in the majority of cases. However, commit c712bb58d827 (ACPI / EC: Add support to skip boot stage DSDT probe) caused the probing of the DSDT EC as the "boot EC" to be skipped when the ECDT EC is valid and uncovered the bug. Fix this issue by invoking acpi_ec_ecdt_start() after acpi_ec_query_init() in acpi_ec_init(). Link: https://jira01.devtools.intel.com/browse/LCK-4348 Fixes: 2a5708409e4e (ACPI / EC: Fix a gap that ECDT EC cannot handle EC events) Fixes: c712bb58d827 (ACPI / EC: Add support to skip boot stage DSDT probe) Reported-by: Wang Wendy <wendy.wang@intel.com> Tested-by: Feng Chenzhou <chenzhoux.feng@intel.com> Signed-off-by: Lv Zheng <lv.zheng@intel.com> [ rjw: Changelog ] Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2017-08-04ACPI / property: Support Apple _DSM propertiesLukas Wunner1-0/+6
While the rest of the world has standardized on _DSD as the way to store device properties in AML (introduced with ACPI 5.1 in 2014), Apple has been using a custom _DSM to achieve the same for much longer (ever since they switched from DeviceTree-based PowerPC to Intel in 2005, verified with MacOS X 10.4.11). The theory of operation on macOS is as follows: AppleACPIPlatform.kext invokes mergeEFIproperties() and mergeDSMproperties() for each device to merge properties conveyed by EFI drivers as well as properties stored in AML into the I/O Kit registry from which they can be retrieved by drivers. We've been supporting EFI properties since commit 58c5475aba67 ("x86/efi: Retrieve and assign Apple device properties"). The present commit adds support for _DSM properties, thereby completing our support for Apple device properties. The _DSM properties are made available under the primary fwnode, the EFI properties under the secondary fwnode. So for devices which possess both property types, they can all be elegantly accessed with the uniform API in <linux/property.h>. Until recently we had no need to support _DSM properties, they contained only uninteresting garbage. The situation has changed with MacBooks and MacBook Pros introduced since 2015: Their keyboard is attached with SPI instead of USB and the _CRS data which is necessary to initialize the spi driver only contains valid information if OSPM responds "false" to _OSI("Darwin"). If OSPM responds "true", _CRS is empty and the spi driver fails to initialize. The rationale is very simple, Apple only cares about macOS and Windows: On Windows, _CRS contains valid data, whereas on macOS it is empty. Instead, macOS gleans the necessary data from the _DSM properties. Since Linux deliberately defaults to responding "true" to _OSI("Darwin"), we need to emulate macOS' behaviour by initializing the spi driver with data returned by the _DSM. An out-of-tree driver for the SPI keyboard exists which currently binds to the ACPI device, invokes the _DSM, parses the returned package and instantiates an SPI device with the data gleaned from the _DSM: https://github.com/cb22/macbook12-spi-driver/commit/9a416d699ef4 https://github.com/cb22/macbook12-spi-driver/commit/0c34936ed9a1 By adding support for Apple's _DSM properties in generic ACPI code, the out-of-tree driver will be able to register as a regular SPI driver, significantly reducing its amount of code and improving its chances to be mainlined. The SPI keyboard will not be the only user of this commit: E.g. on the MacBook8,1, the UART-attached Bluetooth device likewise returns empty _CRS data if OSPM returns "true" to _OSI("Darwin"). The _DSM returns a Package whose format unfortunately deviates slightly from the _DSD spec: The properties are marshalled up in a single Package as alternating key/value elements, unlike _DSD which stores them as a Package of 2-element Packages. The present commit therefore converts the Package to _DSD format and the ACPI core can then treat the data as if Apple would follow the standard. Well, except for one small annoyance: The properties returned by the _DSM only ever have one of two types, Integer or Buffer. The former is retrievable as usual with device_property_read_u64(), but the latter is not part of the _DSD spec and it is not possible to retrieve Buffer properties with the device_property_read_*() functions due to the type checking performed in drivers/acpi/property.c. It is however possible to retrieve them with acpi_dev_get_property(). Apple is using the Buffer type somewhat sloppily to store null-terminated strings but also integers. The real data type is not distinguishable by the ACPI core and the onus is on the caller to use the contents of the Buffer in an appropriate way. In case Apple moves to _DSD in the future, this commit first checks for _DSD and falls back to _DSM only if _DSD is not found. Tested-by: Ronald Tschalär <ronald@innovation.ch> Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Lukas Wunner <lukas@wunner.de> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2017-07-20ACPI / PM / EC: Flush all EC work in acpi_freeze_sync()Rafael J. Wysocki1-0/+4
Commit eed4d47efe95 (ACPI / sleep: Ignore spurious SCI wakeups from suspend-to-idle) introduced acpi_freeze_sync() whose purpose is to flush all of the processing of possible wakeup events signaled via the ACPI SCI. However, it doesn't flush the query workqueue used by the EC driver, so the events generated by the EC may not be processed timely which leads to issues (increased overhead at least, lost events possibly). To fix that introduce acpi_ec_flush_work() that will flush all of the outstanding EC work and call it from acpi_freeze_sync(). Fixes: eed4d47efe95 (ACPI / sleep: Ignore spurious SCI wakeups from suspend-to-idle) Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2017-07-11Merge tag 'devprop-4.13-rc1' of ↵Linus Torvalds1-1/+1
git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm Pull device properties framework updates from Rafael Wysocki: "These mostly rearrange the device properties core code and add a few helper functions to it as a foundation for future work. Specifics: - Rearrange the core device properties code by moving the code specific to each supported platform configuration framework (ACPI, DT and build-in) into a separate file (Sakari Ailus). - Add helper functions for accessing device properties in a firmware-agnostic way (Sakari Ailus, Kieran Bingham)" * tag 'devprop-4.13-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: device property: Add fwnode_graph_get_port_parent device property: Add FW type agnostic fwnode_graph_get_remote_node device property: Introduce fwnode_device_is_available() device property: Move fwnode graph ops to firmware specific locations device property: Move FW type specific functionality to FW specific files ACPI: Constify argument to acpi_device_is_present()
2017-06-23ACPI / sleep: EC-based wakeup from suspend-to-idle on recent systemsRafael J. Wysocki1-0/+2
Some recent Dell laptops, including the XPS13 model numbers 9360 and 9365, cannot be woken up from suspend-to-idle by pressing the power button which is unexpected and makes that feature less usable on those systems. Moreover, on the 9365 ACPI S3 (suspend-to-RAM) is not expected to be used at all (the OS these systems ship with never exercises the ACPI S3 path in the firmware) and suspend-to-idle is the only viable system suspend mechanism there. The reason why the power button wakeup from suspend-to-idle doesn't work on those systems is because their power button events are signaled by the EC (Embedded Controller), whose GPE (General Purpose Event) line is disabled during suspend-to-idle transitions in Linux. That is done on purpose, because in general the EC tends to be noisy for various reasons (battery and thermal updates and similar, for example) and all events signaled by it would kick the CPUs out of deep idle states while in suspend-to-idle, which effectively might defeat its purpose. Of course, on the Dell systems in question the EC GPE must be enabled during suspend-to-idle transitions for the button press events to be signaled while suspended at all, but fortunately there is a way out of this puzzle. First of all, those systems have the ACPI_FADT_LOW_POWER_S0 flag set in their ACPI tables, which means that the OS is expected to prefer the "low power S0 idle" system state over ACPI S3 on them. That causes the most recent versions of other OSes to simply ignore ACPI S3 on those systems, so it is reasonable to expect that it should not be necessary to block GPEs during suspend-to-idle on them. Second, in addition to that, the systems in question provide a special firmware interface that can be used to indicate to the platform that the OS is transitioning into a system-wide low-power state in which certain types of activity are not desirable or that it is leaving such a state and that (in principle) should allow the platform to adjust its operation mode accordingly. That interface is a special _DSM object under a System Power Management Controller device (PNP0D80). The expected way to use it is to invoke function 0 from it on system initialization, functions 3 and 5 during suspend transitions and functions 4 and 6 during resume transitions (to reverse the actions carried out by the former). In particular, function 5 from the "Low-Power S0" device _DSM is expected to cause the platform to put itself into a low-power operation mode which should include making the EC less verbose (so to speak). Next, on resume, function 6 switches the platform back to the "working-state" operation mode. In accordance with the above, modify the ACPI suspend-to-idle code to look for the "Low-Power S0" _DSM interface on platforms with the ACPI_FADT_LOW_POWER_S0 flag set in the ACPI tables. If it's there, use it during suspend-to-idle transitions as prescribed and avoid changing the GPE configuration in that case. [That should reflect what the most recent versions of other OSes do.] Also modify the ACPI EC driver to make it handle events during suspend-to-idle in the usual way if the "Low-Power S0" _DSM interface is going to be used to make the power button events work while suspended on the Dell machines mentioned above Link: http://www.uefi.org/sites/default/files/resources/Intel_ACPI_Low_Power_S0_Idle.pdf Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2017-06-22ACPI: Constify argument to acpi_device_is_present()Sakari Ailus1-1/+1
This will be needed in constifying the fwnode API. The side effects the function had have been moved to the callers. Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com> Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2017-06-15ACPI / PM: Ignore spurious SCI wakeups from suspend-to-idleRafael J. Wysocki1-0/+2
The ACPI SCI (System Control Interrupt) is set up as a wakeup IRQ during suspend-to-idle transitions and, consequently, any events signaled through it wake up the system from that state. However, on some systems some of the events signaled via the ACPI SCI while suspended to idle should not cause the system to wake up. In fact, quite often they should just be discarded. Arguably, systems should not resume entirely on such events, but in order to decide which events really should cause the system to resume and which are spurious, it is necessary to resume up to the point when ACPI SCIs are actually handled and processed, which is after executing dpm_resume_noirq() in the system resume path. For this reasons, add a loop around freeze_enter() in which the platforms can process events signaled via multiplexed IRQ lines like the ACPI SCI and add suspend-to-idle hooks that can be used for this purpose to struct platform_freeze_ops. In the ACPI case, the ->wake hook is used for checking if the SCI has triggered while suspended and deferring the interrupt-induced system wakeup until the events signaled through it are actually processed sufficiently to decide whether or not the system should resume. In turn, the ->sync hook allows all of the relevant event queues to be flushed so as to prevent events from being missed due to race conditions. In addition to that, some ACPI code processing wakeup events needs to be modified to use the "hard" version of wakeup triggers, so that it will cause a system resume to happen on device-induced wakeup events even if the "soft" mechanism to prevent the system from suspending is not enabled. However, to preserve the existing behavior with respect to suspend-to-RAM, this only is done in the suspend-to-idle case and only if an SCI has occurred while suspended. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2017-04-13ACPI / scan: Drop support for force_removeMichal Hocko1-2/+0
/sys/firmware/acpi/hotplug/force_remove was presumably added to support auto offlining in the past. This is, however, inherently dangerous for some hotplugable resources like memory. The memory offlining fails when the memory is still in use and cannot be dropped or migrated. If we ignore the failure we are basically allowing for subtle memory corruption or a crash. We have actually noticed the later while hitting BUG() during the memory hotremove (remove_memory): ret = walk_memory_range(PFN_DOWN(start), PFN_UP(start + size - 1), NULL, check_memblock_offlined_cb); if (ret) BUG(); it took us quite non-trivial time realize that the customer had force_remove enabled. Even if the BUG was removed here and we could propagate the error up the call chain it wouldn't help at all because then we would hit a crash or a memory corruption later and harder to debug. So force_remove is unfixable for the memory hotremove. We haven't checked other hotplugable resources to be prone to a similar problems. Remove the force_remove functionality because it is not fixable currently. Keep the sysfs file and report an error if somebody tries to enable it. Encourage users to report about the missing functionality and work with them with an alternative solution. Reviewed-by: Lee, Chun-Yi <jlee@suse.com> Signed-off-by: Michal Hocko <mhocko@suse.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2017-03-01x86/ioapic: Split IOAPIC hot-removal into two stepsRui Wang1-0/+2
The hot removal of IOAPIC is handling PCI and ACPI removal in one go. That only works when the PCI drivers released the interrupt resources, but breaks when a IOAPIC interrupt is still associated to a PCI device. The new pcibios_release_device() callback allows to solve that problem by splitting the removal into two steps: 1) PCI removal: Release all PCI resources including eventually not yet released IOAPIC interrupts via the new pcibios_release_device() callback. 2) ACPI removal: After release of all PCI resources the ACPI resources can be released without issue. [ tglx: Rewrote changelog ] Signed-off-by: Rui Wang <rui.y.wang@intel.com> Cc: tony.luck@intel.com Cc: linux-pci@vger.kernel.org Cc: rjw@rjwysocki.net Cc: linux-acpi@vger.kernel.org Cc: fengguang.wu@intel.com Cc: helgaas@kernel.org Cc: kbuild-all@01.org Cc: bhelgaas@google.com Link: http://lkml.kernel.org/r/1488288869-31290-3-git-send-email-rui.y.wang@intel.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2017-01-30ACPI / EC: Use busy polling mode when GPE is not enabledLv Zheng1-2/+2
When GPE is not enabled, it is not efficient to use the wait polling mode as it introduces an unexpected scheduler delay. So before the GPE handler is installed, this patch uses busy polling mode for all EC(s) and the logic can be applied to non boot EC(s) during the suspend/resume process. Link: https://bugzilla.kernel.org/show_bug.cgi?id=191561 Tested-by: Jakobus Schurz <jakobus.schurz@gmail.com> Tested-by: Chen Yu <yu.c.chen@intel.com> Signed-off-by: Lv Zheng <lv.zheng@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2016-12-27ACPI / sysfs: Provide quirk mechanism to prevent GPE floodingLv Zheng1-0/+1
Sometimes, the users may require a quirk to be provided from ACPI subsystem core to prevent a GPE from flooding. Normally, if a GPE cannot be dispatched, ACPICA core automatically prevents the GPE from firing. But there are cases the GPE is dispatched by _Lxx/_Exx provided via AML table, and OSPM is lacking of the knowledge to get _Lxx/_Exx correctly executed to handle the GPE, thus the GPE flooding may still occur. The existing quirk mechanism can be enabled/disabled using the following commands to prevent such kind of GPE flooding during runtime: # echo mask > /sys/firmware/acpi/interrupts/gpe00 # echo unmask > /sys/firmware/acpi/interrupts/gpe00 To avoid GPE flooding during boot, we need a boot stage mechanism. This patch provides such a boot stage quirk mechanism to stop this kind of GPE flooding. This patch doesn't fix any feature gap but since the new feature gaps could be found in the future endlessly, and can disappear if the feature gaps are filled, providing a boot parameter rather than a DMI table should suffice. Link: https://bugzilla.kernel.org/show_bug.cgi?id=53071 Link: https://bugzilla.kernel.org/show_bug.cgi?id=117481 Link: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/887793 Signed-off-by: Lv Zheng <lv.zheng@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2016-10-04Merge branch 'x86-apic-for-linus' of ↵Linus Torvalds1-2/+0
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull x86 apic updates from Ingo Molnar: "The main changes are: - Persistent CPU/node numbering across CPU hotplug/unplug events. This is a pretty involved series of changes that first fetches all the information during bootup and then uses it for the various hotplug/unplug methods. (Gu Zheng, Dou Liyang) - IO-APIC hot-add/remove fixes and enhancements. (Rui Wang) - ... various fixes, cleanups and enhancements" * 'x86-apic-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (22 commits) x86/apic: Fix silent & fatal merge conflict in __generic_processor_info() acpi: Fix broken error check in map_processor() acpi: Validate processor id when mapping the processor acpi: Provide mechanism to validate processors in the ACPI tables x86/acpi: Set persistent cpuid <-> nodeid mapping when booting x86/acpi: Enable MADT APIs to return disabled apicids x86/acpi: Introduce persistent storage for cpuid <-> apicid mapping x86/acpi: Enable acpi to register all possible cpus at boot time x86/numa: Online memory-less nodes at boot time x86/apic: Get rid of apic_version[] array x86/apic: Order irq_enter/exit() calls correctly vs. ack_APIC_irq() x86/ioapic: Ignore root bridges without a companion ACPI device x86/apic: Update comment about disabling processor focus x86/smpboot: Check APIC ID before setting up default routing x86/ioapic: Fix IOAPIC failing to request resource x86/ioapic: Fix lost IOAPIC resource after hot-removal and hotadd x86/ioapic: Fix setup_res() failing to get resource x86/ioapic: Support hot-removal of IOAPICs present during boot x86/ioapic: Change prototype of acpi_ioapic_add() x86/apic, ACPI: Fix incorrect assignment when handling apic/x2apic entries ...
2016-10-02Merge branches 'acpi-wdat' and 'acpi-ec'Rafael J. Wysocki1-1/+13
* acpi-wdat: watchdog: wdat_wdt: Fix warning for using 0 as NULL watchdog: wdat_wdt: fix return value check in wdat_wdt_probe() platform/x86: intel_pmc_ipc: Do not create iTCO watchdog when WDAT table exists i2c: i801: Do not create iTCO watchdog when WDAT table exists mfd: lpc_ich: Do not create iTCO watchdog when WDAT table exists ACPI / watchdog: Add support for WDAT hardware watchdog * acpi-ec: ACPI / EC: Fix issues related to boot_ec ACPI / EC: Fix a gap that ECDT EC cannot handle EC events ACPI / EC: Fix a memory leakage issue in acpi_ec_add() ACPI / EC: Cleanup first_ec/boot_ec code ACPI / EC: Enable event freeze mode to improve event handling for suspend process ACPI / EC: Add PM operations to improve event handling for suspend process ACPI / EC: Add PM operations to improve event handling for resume process ACPI / EC: Fix an issue that SCI_EVT cannot be detected after event is enabled ACPI / EC: Add EC_FLAGS_QUERY_ENABLED to reveal a hidden logic ACPI / EC: Add PM operations for suspend/resume noirq stage
2016-09-24ACPI / watchdog: Add support for WDAT hardware watchdogMika Westerberg1-0/+10
Starting from Intel Skylake the iTCO watchdog timer registers were moved to reside in the same register space with SMBus host controller. Not all needed registers are available though and we need to unhide P2SB (Primary to Sideband) device briefly to be able to read status of required NO_REBOOT bit. The i2c-i801.c SMBus driver used to handle this and creation of the iTCO watchdog platform device. Windows, on the other hand, does not use the iTCO watchdog hardware directly even if it is available. Instead it relies on ACPI Watchdog Action Table (WDAT) table to describe the watchdog hardware to the OS. This table contains necessary information about the the hardware and also set of actions which are executed by a driver as needed. This patch implements a new watchdog driver that takes advantage of the ACPI WDAT table. We split the functionality into two parts: first part enumerates the WDAT table and if found, populates resources and creates platform device for the actual driver. The second part is the driver itself. The reason for the split is that this way we can make the driver itself to be a module and loaded automatically if the WDAT table is found. Otherwise the module is not loaded. Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2016-09-10ACPI / EC: Fix a gap that ECDT EC cannot handle EC eventsLv Zheng1-0/+1
It is possible to register _Qxx from namespace and use the ECDT EC to perform event handling. The reported bug reveals that Windows is using ECDT in this way in case the namespace EC is not present. This patch facilitates Linux to support ECDT in this way. Link: https://bugzilla.kernel.org/show_bug.cgi?id=115021 Reported-and-tested-by: Luya Tshimbalanga <luya@fedoraproject.org> Tested-by: Jonh Henderson <jw.hendy@gmail.com> Reviewed-by: Peter Wu <peter@lekensteyn.nl> Signed-off-by: Lv Zheng <lv.zheng@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2016-08-31ACPI / EC: Add PM operations to improve event handling for resume processLv Zheng1-1/+0
This patch makes 2 changes: 1. Restore old behavior Originally, EC driver stops handling both events and transactions in acpi_ec_block_transactions(), and restarts to handle transactions in acpi_ec_unblock_transactions_early(), restarts to handle both events and transactions in acpi_ec_unblock_transactions(). While currently, EC driver still stops handling both events and transactions in acpi_ec_block_transactions(), but restarts to handle both events and transactions in acpi_ec_unblock_transactions_early(). This patch tries to restore the old behavior by dropping __acpi_ec_enable_event() from acpi_unblock_transactions_early(). 2. Improve old behavior However this still cannot fix the real issue as both of the acpi_ec_unblock_xxx() functions are invoked in the noirq stage. Since the EC driver actually doesn't implement the event handling in the polling mode, re-enabling the event handling too early in the noirq stage could result in the problem that if there is no triggering source causing advance_transaction() to be invoked, pending SCI_EVT cannot be detected by the EC driver and _Qxx cannot be triggered. It actually makes sense to restart the event handling in any point during resuming after the noirq stage. Just like the boot stage where the event handling is enabled in .add(), this patch further moves acpi_ec_enable_event() to .resume(). After doing that, the following 2 functions can be combined: acpi_ec_unblock_transactions_early()/acpi_ec_unblock_transactions(). The differences of the event handling availability between the old behavior (this patch isn't applied) and the new behavior (this patch is applied) are as follows: !Applied Applied before suspend Y Y suspend before EC Y Y suspend after EC Y Y suspend_late Y Y suspend_noirq Y (actually N) Y (actually N) resume_noirq Y (actually N) Y (actually N) resume_late Y (actually N) Y (actually N) resume before EC Y (actually N) Y (actually N) resume after EC Y (actually N) Y after resume Y (actually N) Y Where "actually N" means if there is no triggering source, the EC driver is actually not able to notice the pending SCI_EVT occurred in the noirq stage. So we can clearly see that this patch has improved the situation. Signed-off-by: Lv Zheng <lv.zheng@intel.com> Tested-by: Todd E Brandt <todd.e.brandt@linux.intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2016-08-31ACPI / bus: Make acpi_get_first_physical_node() publicLukas Wunner1-1/+0
Following the fwnode of a device is currently a one-way road: We provide ACPI_COMPANION() to obtain the fwnode but there's no (public) method to do the reverse. Granted, there may be multiple physical_nodes, but often the first one in the list is sufficient. A handy function to obtain it was introduced with commit 3b95bd160547 ("ACPI: introduce a function to find the first physical device"), but currently it's only available internally. We're about to add an EFI Device Path parser which needs this function. Consider the following device path: ACPI(PNP0A03,0)/PCI(28,2)/PCI(0,0) The PCI root is encoded as an ACPI device in the path, so the parser has to find the corresponding ACPI device, then find its physical node, find the PCI bridge in slot 1c (decimal 28), function 2 below it and finally find the PCI device in slot 0, function 0. To this end, make acpi_get_first_physical_node() public. Signed-off-by: Lukas Wunner <lukas@wunner.de> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2016-08-18x86/ioapic: Change prototype of acpi_ioapic_add()Rui Wang1-2/+0
Change the argument of acpi_ioapic_add() to a generic ACPI handle, and move its prototype from drivers/acpi/internal.h to include/linux/acpi.h so that it can be called from outside the pci_root driver. Signed-off-by: Rui Wang <rui.y.wang@intel.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: bhelgaas@google.com Cc: helgaas@kernel.org Cc: linux-acpi@vger.kernel.org Cc: linux-pci@vger.kernel.org Cc: rjw@rjwysocki.net Cc: tony.luck@intel.com Link: http://lkml.kernel.org/r/1471420837-31003-2-git-send-email-rui.y.wang@intel.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
2016-08-17ACPI / EC: Add PM operations for suspend/resume noirq stageLv Zheng1-0/+2
It is reported that on some platforms, resume speed is not fast. The cause is: in noirq stage, EC driver is working in polling mode, and each state machine advancement requires a context switch. The context switch is not necessary to the EC driver's polling mode. This patch implements PM hooks to automatically switch the driver to/from the busy polling mode to eliminate the overhead caused by the context switch. This finally contributes to the tuning result: acpi_pm_finish() execution time is improved from 192ms to 6ms. Signed-off-by: Lv Zheng <lv.zheng@intel.com> Reported-and-tested-by: Todd E Brandt <todd.e.brandt@linux.intel.com> [ rjw: Subject ] Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2016-07-08ACPI: add support for ACPI reconfiguration notifiersOctavian Purdila1-0/+3
Add support for ACPI reconfiguration notifiers to allow subsystems to react to changes in the ACPI tables that happen after the initial enumeration. This is similar with the way dynamic device tree notifications work. The reconfigure notifications supported for now are device add and device remove. Since ACPICA allows only one table notification handler, this patch makes the table notifier function generic and moves it out of the sysfs specific code. Signed-off-by: Octavian Purdila <octavian.purdila@intel.com> Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2016-06-10Merge branch 'acpi-ec'Rafael J. Wysocki1-1/+1
* acpi-ec: ACPI / EC: Fix a boot EC regresion by restoring boot EC support for the DSDT EC
2016-06-07ACPI / EC: Fix a boot EC regresion by restoring boot EC support for the DSDT ECLv Zheng1-1/+1
According to the Windows probing result, during the table loading, the EC device described in the ECDT should be used. And the ECDT EC is also effective during the period the namespace objects are initialized (we can see a separate process executing _STA/_INI on Windows before executing other device specific control methods, for example, EC._REG). During the device enumration, the EC device described in the DSDT should be used. But there are differences between Linux and Windows around the device probing order. Thus in Linux, we should enable the DSDT EC as early as possible before enumerating devices in order not to trigger issues related to the device enumeration order differences. This patch thus converts acpi_boot_ec_enable() into acpi_ec_dsdt_probe() to fix the gap. This also fixes a user reported regression triggered after we switched the "table loading"/"ECDT support" to be ACPI spec 2.0 compliant. Fixes: 59f0aa9480cf (ACPI 2.0 / ECDT: Remove early namespace reference from EC) Link: https://bugzilla.kernel.org/show_bug.cgi?id=119261 Reported-and-tested-by: Gabriele Mazzotta <gabriele.mzt@gmail.com> Signed-off-by: Lv Zheng <lv.zheng@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2016-05-16Merge branches 'acpi-numa', 'acpi-tables' and 'acpi-osi'Rafael J. Wysocki1-1/+2
* acpi-numa: ACPI / SRAT: fix SRAT parsing order with both LAPIC and X2APIC present * acpi-tables: ACPI / tables: Fix DSDT override mechanism ACPI / tables: Convert initrd table override to table upgrade mechanism ACPI / x86: Cleanup initrd related code ACPI / tables: Move table override mechanisms to tables.c * acpi-osi: ACPI / osi: Collect _OSI handling into one single file ACPI / osi: Cleanup coding style issues before creating a separate OSI source file ACPI / osi: Cleanup OSI handling code to use bool ACPI / osi: Fix default _OSI(Darwin) support ACPI / osi: Add acpi_osi=!! to allow reverting acpi_osi=! ACPI / osi: Cleanup _OSI("Linux") related code before introducing new support ACPI / osi: Fix an issue that acpi_osi=!* cannot disable ACPICA internal strings Conflicts: drivers/acpi/internal.h
2016-05-05ACPI / osi: Collect _OSI handling into one single fileLv Zheng1-0/+2
_OSI handling code grows giant and it's time to move them into one file. This patch collects all _OSI handling code into one single file. So that we only have the following functions to be used externally: early_acpi_osi_init(): Used by DMI detections; acpi_osi_init(): Used to initialize OSI command line settings and install Linux specific _OSI handler; acpi_osi_setup(): The API that should be used by the external quirks. acpi_osi_is_win8(): The API is used by the external drivers to determine if BIOS supports Win8. CONFIG_DMI is not useful as stub dmi_check_system() can make everything stub because of strip. No functional changes. Tested-by: Lukas Wunner <lukas@wunner.de> Tested-by: Chen Yu <yu.c.chen@intel.com> Signed-off-by: Lv Zheng <lv.zheng@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2016-04-19ACPI / tables: Move table override mechanisms to tables.cLv Zheng1-1/+0
This patch moves acpi_os_table_override() and acpi_os_physical_table_override() to tables.c. Along with the mechanisms, acpi_initrd_initialize_tables() is also moved to tables.c to form a static function. The following functions are renamed according to this change: 1. acpi_initrd_override() -> renamed to early_acpi_table_init(), which invokes acpi_table_initrd_init() 2. acpi_os_physical_table_override() -> which invokes acpi_table_initrd_override() 3. acpi_initialize_initrd_tables() -> renamed to acpi_table_initrd_scan() Signed-off-by: Lv Zheng <lv.zheng@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2016-04-02Merge branch 'acpi-processor'Rafael J. Wysocki1-0/+6
* acpi-processor: ACPI / processor: Request native thermal interrupt handling via _OSC
2016-03-26ACPI / processor: Request native thermal interrupt handling via _OSCSrinivas Pandruvada1-0/+6
There are several reports of freeze on enabling HWP (Hardware PStates) feature on Skylake-based systems by the Intel P-states driver. The root cause is identified as the HWP interrupts causing BIOS code to freeze. HWP interrupts use the thermal LVT which can be handled by Linux natively, but on the affected Skylake-based systems SMM will respond to it by default. This is a problem for several reasons: - On the affected systems the SMM thermal LVT handler is broken (it will crash when invoked) and a BIOS update is necessary to fix it. - With thermal interrupt handled in SMM we lose all of the reporting features of the arch/x86/kernel/cpu/mcheck/therm_throt driver. - Some thermal drivers like x86-package-temp depend on the thermal threshold interrupts signaled via the thermal LVT. - The HWP interrupts are useful for debugging and tuning performance (if the kernel can handle them). The native handling of thermal interrupts needs to be enabled because of that. This requires some way to tell SMM that the OS can handle thermal interrupts. That can be done by using _OSC/_PDC in processor scope very early during ACPI initialization. The meaning of _OSC/_PDC bit 12 in processor scope is whether or not the OS supports native handling of interrupts for Collaborative Processor Performance Control (CPPC) notifications. Since on HWP-capable systems CPPC is a firmware interface to HWP, setting this bit effectively tells the firmware that the OS will handle thermal interrupts natively going forward. For details on _OSC/_PDC refer to: http://www.intel.com/content/www/us/en/standards/processor-vendor-specific-acpi-specification.html To implement the _OSC/_PDC handshake as described, introduce a new function, acpi_early_processor_osc(), that walks the ACPI namespace looking for ACPI processor objects and invokes _OSC for them with bit 12 in the capabilities buffer set and terminates the namespace walk on the first success. Also modify intel_thermal_interrupt() to clear HWP status bits in the HWP_STATUS MSR to acknowledge HWP interrupts (which prevents them from firing continuously). Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> [ rjw: Subject & changelog, function rename ] Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2016-03-14Merge branches 'acpi-scan', 'acpi-osl' and 'acpi-apei'Rafael J. Wysocki1-0/+7
* acpi-scan: ACPI / scan: AMBA bus probing support ACPI: introduce a function to find the first physical device * acpi-osl: ACPI / OSL: Add support to install tables via initrd ACPI / OSL: Clean up initrd table override code * acpi-apei: ACPI / APEI: ERST: Fixed leaked resources in erst_init ACPI / APEI: Fix leaked resources
2016-03-10ACPI / OSL: Add support to install tables via initrdLv Zheng1-0/+1
This patch adds support to install tables from initrd. If a table in the initrd wasn't used by the override mechanism, the table would be installed after initializing all RSDT/XSDT tables. Link: https://lkml.org/lkml/2014/2/28/368 Reported-by: Thomas Renninger <trenn@suse.de> Signed-off-by: Lv Zheng <lv.zheng@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2016-02-16ACPI / scan: AMBA bus probing supportGraeme Gregory1-0/+5
On ARM64 some devices use the AMBA device and not the platform bus for probing so add support for this. Uses a dummy clock for apb_pclk as ACPI does not have a suitable clock representation and to keep the core AMBA bus code unchanged between probing methods. Acked-by: Russell King <rmk+kernel@arm.linux.org.uk> Signed-off-by: Graeme Gregory <graeme.gregory@linaro.org> Signed-off-by: Aleksey Makarov <aleksey.makarov@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2016-02-16ACPI: introduce a function to find the first physical deviceAleksey Makarov1-0/+1
Factor out the code that finds the first physical device of a given ACPI device. It is used in several places. Signed-off-by: Aleksey Makarov <aleksey.makarov@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2016-01-05ACPI: Fix white space in a structure definitionLukas Wunner1-1/+1
Add a missing space in the definition of struct acpi_device_bus_id. Signed-off-by: Lukas Wunner <lukas@wunner.de> [ rjw: Subject and changelog ] Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2015-12-09ACPI / utils: Add acpi_dev_present()Lukas Wunner1-0/+8
There's an idiom in use by 7 Linux drivers to detect the presence of a particular ACPI HID by walking the namespace with acpi_get_devices(). The callback passed to acpi_get_devices() is mostly identical across the drivers, leading to lots of duplicate code. Add acpi_dev_present(), the ACPI equivalent to pci_dev_present(), allowing us to deduplicate all that boilerplate in the drivers. Signed-off-by: Lukas Wunner <lukas@wunner.de> Reviewed-by: Hanjun Guo <hanjun.guo@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2015-11-05Merge tag 'driver-core-4.4-rc1' of ↵Linus Torvalds1-1/+1
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core Pull driver core updates from Greg KH: "Here's the "big" driver core updates for 4.4-rc1. Primarily a bunch of debugfs updates, with a smattering of minor driver core fixes and updates as well. All have been in linux-next for a long time" * tag 'driver-core-4.4-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core: debugfs: Add debugfs_create_ulong() of: to support binding numa node to specified device in devicetree debugfs: Add read-only/write-only bool file ops debugfs: Add read-only/write-only size_t file ops debugfs: Add read-only/write-only x64 file ops debugfs: Consolidate file mode checks in debugfs_create_*() Revert "mm: Check if section present during memory block (un)registering" driver-core: platform: Provide helpers for multi-driver modules mm: Check if section present during memory block (un)registering devres: fix a for loop bounds check CMA: fix CONFIG_CMA_SIZE_MBYTES overflow in 64bit base/platform: assert that dev_pm_domain callbacks are called unconditionally sysfs: correctly handle short reads on PREALLOC attrs. base: soc: siplify ida usage kobject: move EXPORT_SYMBOL() macros next to corresponding definitions kobject: explain what kobject's sd field is debugfs: document that debugfs_remove*() accepts NULL and error values debugfs: Pass bool pointer to debugfs_create_bool() ACPI / EC: Fix broken 64bit big-endian users of 'global_lock'
2015-10-04debugfs: Pass bool pointer to debugfs_create_bool()Viresh Kumar1-1/+1
Its a bit odd that debugfs_create_bool() takes 'u32 *' as an argument, when all it needs is a boolean pointer. It would be better to update this API to make it accept 'bool *' instead, as that will make it more consistent and often more convenient. Over that bool takes just a byte. That required updates to all user sites as well, in the same commit updating the API. regmap core was also using debugfs_{read|write}_file_bool(), directly and variable types were updated for that to be bool as well. Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Acked-by: Mark Brown <broonie@kernel.org> Acked-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2015-10-04ACPI / EC: Fix broken 64bit big-endian users of 'global_lock'Viresh Kumar1-1/+1
global_lock is defined as an unsigned long and accessing only its lower 32 bits from sysfs is incorrect, as we need to consider other 32 bits for big endian 64-bit systems. There are no such platforms yet, but the code needs to be robust for such a case. Fix that by changing type of 'global_lock' to u32. Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2015-09-15ACPI: change acpi_sleep_proc_init() to return voidRami Rosen1-2/+2
This patch changes the type of the return value of the acpi_sleep_proc_init() method to be void, as this method never fails and its return value is never used. Signed-off-by: Rami Rosen <ramirose@gmail.com>\ [ rjw : Fixed up the static inline stub ] Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>