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path: root/drivers/rtc/rtc-efi.c
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2023-10-15rtc: efi: fixed typo in efi_procfs()Maxim Korotkov1-1/+1
After the first check of the value of the "eft" variable it does not change, it is obvious that a copy-paste error was made here and the value of variable "alm" should be checked here. Found by Linux Verification Center (linuxtesting.org) with SVACE. Fixes: 501385f2a783 ("rtc: efi: add efi_procfs in efi_rtc_ops") Signed-off-by: Maxim Korotkov <korotkov.maxim.s@gmail.com> Link: https://lore.kernel.org/r/20231006090444.306729-1-korotkov.maxim.s@gmail.com Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2023-02-22rtc: efi: Avoid spamming the log on RTC read failureArd Biesheuvel1-1/+1
There are cases where the EFI runtime services may end up in a funny state, e.g., due to a crash in the variable services, and this affects other EFI runtime services as well. That means that, even though GetTime() should not return an error, there are cases where it might, and there is no point in logging such an occurrence multiple times. This works around an issue where user space -apparently- keeps hitting on /dev/rtc if it fails to read the h/w clock, resulting in a tsunami of log spam and a non-responsive system as a result. Cc: Pierre Gondois <pierre.gondois@arm.com> Cc: Alexandru Elisei <alexandru.elisei@arm.com> Link: https://lore.kernel.org/all/Y2o1hdZK9GGDVJsS@monolith.localdoman/ Signed-off-by: Ard Biesheuvel <ardb@kernel.org> Link: https://lore.kernel.org/r/20230217142338.1444509-1-ardb@kernel.org Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2023-01-09rtc: efi: Enable SET/GET WAKEUP services as optionalShanker Donthineni1-21/+27
The current implementation of rtc-efi is expecting all the 4 time services GET{SET}_TIME{WAKEUP} must be supported by UEFI firmware. As per the EFI_RT_PROPERTIES_TABLE, the platform specific implementations can choose to enable selective time services based on the RTC device capabilities. This patch does the following changes to provide GET/SET RTC services on platforms that do not support the WAKEUP feature. 1) Relax time services cap check when creating a platform device. 2) Clear RTC_FEATURE_ALARM bit in the absence of WAKEUP services. 3) Conditional alarm entries in '/proc/driver/rtc'. Cc: <stable@vger.kernel.org> # v6.0+ Signed-off-by: Shanker Donthineni <sdonthineni@nvidia.com> Link: https://lore.kernel.org/r/20230102230630.192911-1-sdonthineni@nvidia.com Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2022-11-16rtc: efi: Add wakeup supportRiwen Lu1-0/+2
Add wakeup support for rtc-efi, so we can wakeup from S3/S4/S5 through rtcwake. Signed-off-by: Riwen Lu <luriwen@kylinos.cn> Link: https://lore.kernel.org/r/TYWP286MB260191455377CEBD2336557EB1659@TYWP286MB2601.JPNP286.PROD.OUTLOOK.COM Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2022-03-23rtc: efi: switch to RTC_FEATURE_UPDATE_INTERRUPTAlexandre Belloni1-1/+2
Stop using uie_unsupported and clear RTC_FEATURE_UPDATE_INTERRUPT instead. Also the driver doesn't supports UIE because it doesn't handle interrupts so set RTC_FEATURE_ALARM_WAKEUP_ONLY,. Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com> Link: https://lore.kernel.org/r/20220309162301.61679-24-alexandre.belloni@bootlin.com
2022-03-23rtc: efi: switch to devm_rtc_allocate_deviceAlexandre Belloni1-4/+5
Switch to devm_rtc_allocate_device/devm_rtc_register_device, this allows for further improvement of the driver. Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com> Link: https://lore.kernel.org/r/20220309162301.61679-23-alexandre.belloni@bootlin.com
2021-05-25rtc: efi: Remove the repeated module aliasShaokun Zhang1-1/+0
'MODULE_ALIAS' is declared twice, cleanup one. Cc: Alessandro Zummo <a.zummo@towertech.it> Cc: Alexandre Belloni <alexandre.belloni@bootlin.com> Signed-off-by: Shaokun Zhang <zhangshaokun@hisilicon.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com> Link: https://lore.kernel.org/r/1621848834-20857-1-git-send-email-zhangshaokun@hisilicon.com
2019-05-30treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152Thomas Gleixner1-6/+1
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-03-02rtc: stop validating rtc_time in .read_timeAlexandre Belloni1-1/+1
The RTC core is always calling rtc_valid_tm after the read_time callback. It is not necessary to call it just before returning from the callback. Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2016-06-06rtc: efi: Fail probing if RTC reads don't workAlexander Graf1-0/+6
While the EFI spec mandates an RTC, not every implementation actually adheres to that rule (or can adhere to it - some systems just don't have an RTC). For those, we really don't want to probe the EFI RTC driver at all, because if we do we'd get a non-functional driver that does nothing useful but only spills our kernel log with warnings. Signed-off-by: Alexander Graf <agraf@suse.de> Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2016-01-11rtc: efi: add efi_procfs in efi_rtc_opsGeliang Tang1-4/+62
Add efi_procfs in efi_rtc_ops to show rtc-efi info in /proc/driver/rtc. Most of the code comes from efi_rtc_proc_show() in efirtc. Signed-off-by: Geliang Tang <geliangtang@163.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2015-06-25rtc: efi: use correct EFI 'epoch'Ard Biesheuvel1-25/+14
The rtc-efi driver declares that the EFI 'epoch' is 1/1/1998, but the UEFI spec does not define it at all. It does define a range of [1900, 9999] for the 'Year' member of the EFI_TIME struct, so let's use 1900 as the minimum year and not 1998. Also, move the validation of the year to the convert_from_efi_time() routine where all other EFI_TIME fields are validated as well. This prevents rtc_read_time() failures when the RTC that backs the EFI time services is set to a date before 1998, e.g., when it has lost power. This also optimizes the compute_wday() routine, by replacing the for loop with a simple arithmetic expression, and by reusing the yearday value that we need to compute anyway when populating the rtc_time::tm_yday field. Cc: Alessandro Zummo <a.zummo@towertech.it> Cc: Alexandre Belloni <alexandre.belloni@free-electrons.com> Cc: rtc-linux@googlegroups.com Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2015-06-19rtc: efi: Update author email addressdann frazier1-2/+2
I'm no longer employed by HP. Signed-off-by: dann frazier <dannf@dannf.org> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
2015-01-29Merge tag 'efi-next' of ↵Ingo Molnar1-0/+1
git://git.kernel.org/pub/scm/linux/kernel/git/mfleming/efi into x86/efi Pull EFI updates from Matt Fleming: " - Move efivarfs from the misc filesystem section to pseudo filesystem, since that's a more logical and accurate place - Leif Lindholm - Update efibootmgr URL in Kconfig help - Peter Jones - Improve accuracy of EFI guid function names - Borislav Petkov - Expose firmware platform size in sysfs for the benefit of EFI boot loader installers and other utilities - Steve McIntyre - Cleanup __init annotations for arm64/efi code - Ard Biesheuvel - Mark the UIE as unsupported for rtc-efi - Ard Biesheuvel - Fix memory leak in error code path of runtime map code - Dan Carpenter - Improve robustness of get_memory_map() by removing assumptions on the size of efi_memory_desc_t (which could change in future spec versions) and querying the firmware instead of guessing about the memmap size - Ard Biesheuvel - Remove superfluous guid unparse calls - Ivan Khoronzhuk - Delete unnecessary chosen@0 DT node FDT code since was duplicated from code in drivers/of and is entirely unnecessary - Leif Lindholm There's nothing super scary, mainly cleanups, and a merge from Ricardo who kindly picked up some patches from the linux-efi mailing list while I was out on annual leave in December. Perhaps the biggest risk is the get_memory_map() change from Ard, which changes the way that both the arm64 and x86 EFI boot stub build the early memory map. It would be good to have it bake in linux-next for a while. " Signed-off-by: Ingo Molnar <mingo@kernel.org>
2015-01-20efi: rtc-efi: Mark UIE as unsupportedArd Biesheuvel1-0/+1
Tools like hwclock attempt to enable the RTC update interrupt (UIE) to maximize the accuracy of the reported time value. The EFI rtc does not have interrupt capability so this is a pointless exercise to begin with, but the generic RTC framework ends up issuing a SetWakeupTime() Runtime Services call before drawing that conclusion on its own. Instead, we can mark UIE as unsupported at driver probe time. The net result is the same, but without the spurious SetWakeupTime() call. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Matt Fleming <matt.fleming@intel.com>
2014-11-03Merge branch 'platform/remove_owner' of ↵Greg Kroah-Hartman1-1/+0
git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux into driver-core-next Remove all .owner fields from platform drivers
2014-10-20rtc: drop owner assignment from platform_driversWolfram Sang1-1/+0
A platform_driver does not need to set an owner, it will be populated by the driver core. Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2014-10-03Merge branch 'next' into efi-next-mergeMatt Fleming1-0/+1
Conflicts: arch/x86/boot/compressed/eboot.c
2014-10-03efi: rtc-efi: Export platform:rtc-efi as module aliasArd Biesheuvel1-0/+1
When the rtc-efi driver is built as a module, we already register the EFI rtc as a platform device if UEFI Runtime Services are enabled. To wire it up to udev, and let the module be loaded automatically, we need to export the 'platform:rtc-efi' alias from the module. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Cc: Alessandro Zummo <a.zummo@towertech.it> Cc: Mark Salter <msalter@redhat.com> Cc: Dave Young <dyoung@redhat.com> Signed-off-by: Matt Fleming <matt.fleming@intel.com>
2014-09-26drivers/rtc/rtc-efi.c: add missing module aliasPali Rohár1-0/+1
Without proper alias kernel module is not loaded for rtc-efi driver. Signed-off-by: Pali Rohár <pali.rohar@gmail.com> Cc: dann frazier <dannf@dannf.org> Cc: Alessandro Zummo <a.zummo@towertech.it> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2014-08-08drivers/rtc/rtc-efi.c: check for invalid data coming back from UEFIJan Beulich1-5/+27
In particular seeing zero in eft->month is problematic, as it results in -1 (converted to unsigned int, i.e. yielding 0xffffffff) getting passed to rtc_year_days(), where the value gets used as an array index (normally resulting in a crash). This was observed with the driver enabled on x86 on some Fujitsu system (with possibly not up to date firmware, but anyway). Perhaps efi_read_alarm() should not fail if neither enabled nor pending are set, but the returned time is invalid? Signed-off-by: Jan Beulich <jbeulich@suse.com> Reported-by: Raymund Will <rw@suse.de> Cc: Alessandro Zummo <a.zummo@towertech.it> Cc: Jingoo Han <jg1.han@samsung.com> Acked-by: Lee, Chun-Yi <jlee@suse.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2014-06-06drivers/rtc/rtc-efi.c: avoid subtracting day twice when computing year daysLee, Chun-Yi1-1/+1
Compared source code of rtc-lib.c::rtc_year_days() with efirtc.c::rtc_year_days(), found the code in rtc-efi decreases value of day twice when it computing year days. rtc-lib.c::rtc_year_days() has already decrease days and return the year days from 0 to 365. Signed-off-by: Lee, Chun-Yi <jlee@suse.com> Cc: Alessandro Zummo <a.zummo@towertech.it> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-07-03drivers/rtc/rtc-efi.c: remove empty functionSachin Kamat1-6/+0
After the switch to devm_* functions and the removal of rtc_device_unregister(), the 'remove' function does not do anything. Delete it. Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org> Cc: dann frazier <dannf@hp.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-04-29rtc: rtc-efi: use devm_rtc_device_register()Jingoo Han1-5/+1
devm_rtc_device_register() is device managed and makes cleanup paths simpler. Signed-off-by: Jingoo Han <jg1.han@samsung.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-04-29rtc: rtc-efi: use module_platform_driver_probe()Jingoo Han1-12/+1
Use module_platform_driver_probe() macro which makes the code smaller and simpler. Signed-off-by: Jingoo Han <jg1.han@samsung.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-02-21rtc: rtc-efi: use dev_err()/dev_warn()/pr_err() instead of printk()Jingoo Han1-4/+6
Fix the checkpatch warnings as below: WARNING: Prefer netdev_err(netdev, ... then dev_err(dev, ... then pr_err(... to printk(KERN_ERR ... WARNING: please, no space before tabs Signed-off-by: Jingoo Han <jg1.han@samsung.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-04-12drivers/rtc/rtc-efi.c: fix section mismatch warningJan Beulich1-1/+0
efi_rtc_init() uses platform_driver_probe(), so there's no need to also set efi_rtc_driver's probe member (as it won't be used anyway). This fixes a modpost section mismatch warning (as efi_rtc_probe() validly is __init). Signed-off-by: Jan Beulich <jbeulich@suse.com> Cc: Matthew Garrett <mjg@redhat.com> Cc: Alessandro Zummo <a.zummo@towertech.it> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-04-01rtc: add platform driver for EFIdann frazier1-0/+235
Munge Stephane Eranian's efirtc.c code into an rtc platform driver [akpm@linux-foundation.org: use is_leap_year()] Signed-off-by: dann frazier <dannf@hp.com> Cc: Alessandro Zummo <alessandro.zummo@towertech.it> Cc: stephane eranian <eranian@googlemail.com> Cc: "Luck, Tony" <tony.luck@intel.com> Cc: David Brownell <david-b@pacbell.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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