linux/drivers/acpi/acpi_processor.c, branch v6.7

cpu-hotplug: Provide prototypes for arch CPU registration

2023-10-11T12:27:37Z

Provide common prototypes for arch_register_cpu() and arch_unregister_cpu(). These are called by acpi_processor.c, with weak versions, so the prototype for this is already set. It is generally not necessary for function prototypes to be conditional on preprocessor macros. Some architectures (e.g. Loongarch) are missing the prototype for this, and rather than add it to Loongarch's asm/cpu.h, do the job once for everyone. Since this covers everyone, remove the now unnecessary prototypes in asm/cpu.h, and therefore remove the 'static' from one of ia64's arch_register_cpu() definitions. [ tglx: Bring back the ia64 part and remove the ACPI prototypes ] Signed-off-by: Russell King (Oracle) Signed-off-by: Thomas Gleixner Link: https://lore.kernel.org/r/E1qkoRr-0088Q8-Da@rmk-PC.armlinux.org.uk

ACPI: processor: Refine messages in acpi_early_processor_control_setup()

2023-07-20T19:05:00Z

The source and meaning of the messages printed by acpi_early_processor_control_setup() is unclear, so add a pr_fmt() definition to acpi_processor.c and expand the messages to make it clear that they are about CPUs. Signed-off-by: Rafael J. Wysocki Reviewed-by: Michal Wilczynski

ACPI: processor: Remove acpi_hwp_native_thermal_lvt_osc()

2023-07-17T12:47:42Z

The workaround for buggy skylake BIOSes is now implemented in acpi_processor_osc() and acpi_hwp_native_thermal_lvt_osc() has no callers, so drop it. Suggested-by: Rafael J. Wysocki Signed-off-by: Michal Wilczynski Reviewed-by: Andy Shevchenko [ rjw: Subject and changelog edits ] Signed-off-by: Rafael J. Wysocki

ACPI: processor: Use _OSC to convey OSPM processor support information

2023-07-17T12:47:18Z

Change acpi_early_processor_osc() to return a value in case of a failure and make it static. Also make it run acpi_processor_osc() for every processor object or processor device found in the ACPI Namespace (previously, its only purpose was to work around platform firmware defects on Skylake systems). Introduce a new function called acpi_early_processor_control_setup() that will invoke acpi_early_processor_osc() first in order to convey the OS processor support information to the platform firmware and if that fails, it will fall back to using _PDC. Suggested-by: Rafael J. Wysocki Signed-off-by: Michal Wilczynski Reviewed-by: Andy Shevchenko [ rjw: Subject and changelog edits, change function return value to bool, add missing 'static', change messages ] Signed-off-by: Rafael J. Wysocki

ACPI: processor: Introduce acpi_processor_osc()

2023-07-14T15:59:40Z

The processor _OSC method is already used for a workaround introduced in commit a21211672c9a ("ACPI / processor: Request native thermal interrupt handling via _OSC"), but in accordance with ACPI 6.5 (and earlier), it should be used for negotiating all of the processor capabilities instead of _PDC (which has been deprecated since ACPI 3.0 and got removed from ACPI 6.5 entirely). Create a new callback function called acpi_processor_osc() to be invoked for every processor object and processor device in the ACPI namespace, in analogy with the already existing acpi_hwp_native_thermal_lvt_osc(). Make this function implement the workaround mentioned above and convey all of the OSPM processor support information to the platform firmware by setting all of the appropriate processor capabilities bits before evaluating _OSC for the given processor. For this purpose, make it call arch_acpi_set_proc_cap_bits() and modify the latter to set ACPI_PROC_CAP_COLLAB_PROC_PERF along with the other processor capabilities bits. Suggested-by: Rafael J. Wysocki Signed-off-by: Michal Wilczynski Reviewed-by: Andy Shevchenko [ rjw: Subject and changelog edits, whitespace fixup ] Signed-off-by: Rafael J. Wysocki

ACPI: processor: Move processor_physically_present() to acpi_processor.c

2023-07-14T15:59:40Z

Since _PDC method is deprecated and a preferred method of communicating OSPM processor power management capabilities is _OSC, there is a need to move function checking whether processor is present as this logic is not _PDC specific. Move processor_physically_present() to acpi_processor.c. No intentional functional impact. Suggested-by: Rafael J. Wysocki Signed-off-by: Michal Wilczynski [ rjw: Subject and changelog edits ] Signed-off-by: Rafael J. Wysocki

ACPI: cpufreq: Use platform devices to load ACPI PPC and PCC drivers

2023-03-20T17:54:13Z

The acpi-cpufreq and pcc-cpufreq drivers are loaded through per-CPU module aliases. This can result in many unnecessary load requests during boot if another frequency module, such as intel_pstate, is already active. For instance, on a typical Intel system, one can observe that udev makes 2x#CPUs attempts to insert acpi_cpufreq and 1x#CPUs attempts for pcc_cpufreq. All these tries then fail if another frequency module is already registered. In the worst case, without the recent fix in commit 0254127ab977e ("module: Don't wait for GOING modules"), these module loads occupied all udev workers and had their initialization attempts ran sequentially. Resolving all these loads then on some larger machines took too long, prevented other hardware from getting its drivers initialized and resulted in a failed boot. Discussion over these duplicate module requests ended up with a conclusion that only one load attempt should be ideally made. Both acpi-cpufreq and pcc-cpufreq drivers use platform firmware controls which are defined by ACPI. It is possible to treat these interfaces as platform devices. The patch extends the ACPI parsing logic to check the ACPI namespace if the PPC or PCC interface is present and creates a virtual platform device for each if it is available. The acpi-cpufreq and pcc-cpufreq drivers are then updated to map to these devices. This allows to try loading acpi-cpufreq and pcc-cpufreq only once during boot and only if a given interface is available in the firmware. Signed-off-by: Petr Pavlu [ rjw: whitespace and error message log level adjustments, subject edits ] Signed-off-by: Rafael J. Wysocki

ACPI: processor: Replace deprecated CPU-hotplug functions

2021-08-04T18:25:54Z

The functions cpu_hotplug_begin, cpu_hotplug_done, get_online_cpus() and put_online_cpus() have been deprecated during the CPU hotplug rework. They map directly to cpus_write_lock(), cpus_write_unlock, cpus_read_lock() and cpus_read_unlock(). Replace deprecated CPU-hotplug functions with the official version. The behavior remains unchanged. Signed-off-by: Sebastian Andrzej Siewior Signed-off-by: Rafael J. Wysocki

Merge branch 'acpi-misc'

2021-04-26T15:04:41Z

* acpi-misc: ACPI: dock: fix some coding style issues ACPI: sysfs: fix some coding style issues ACPI: PM: add a missed blank line after declarations ACPI: custom_method: fix a coding style issue ACPI: CPPC: fix some coding style issues ACPI: button: fix some coding style issues ACPI: battery: fix some coding style issues ACPI: acpi_pad: add a missed blank line after declarations ACPI: LPSS: add a missed blank line after declarations ACPI: ipmi: remove useless return statement for void function ACPI: processor: fix some coding style issues ACPI: APD: fix a block comment align issue ACPI: AC: fix some coding style issues ACPI: fix various typos in comments

ACPI: processor: fix some coding style issues

2021-04-08T14:27:02Z

Fix some coding style issues reported by checkpatch.pl, including the following types: ERROR: code indent should use tabs where possible WARNING: Block comments use a trailing */ on a separate line WARNING: Missing a blank line after declarations WARNING: labels should not be indented Signed-off-by: Xiaofei Tan Signed-off-by: Rafael J. Wysocki