BMC/Intel-BMC/linux.git/drivers/acpi/bus.c, branch dev-4.6

Merge branch 'acpi-processor'

2016-04-01T23:17:36+00:00

* acpi-processor: ACPI / processor: Request native thermal interrupt handling via _OSC

ACPI / processor: Request native thermal interrupt handling via _OSC

2016-03-26T01:00:38+00:00

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 [ rjw: Subject & changelog, function rename ] Signed-off-by: Rafael J. Wysocki

ACPI: introduce a function to find the first physical device

2016-02-16T18:56:28+00:00

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 Signed-off-by: Rafael J. Wysocki

Merge branches 'acpi-scan', 'acpi-bus', 'acpi-osl' and 'acpi-pm'

2016-01-12T00:10:03+00:00

* acpi-scan: ACPI: Fix white space in a structure definition ACPI / utils: Add acpi_dev_present() ACPI / scan: Fix acpi_bus_id_list bookkeeping ACPI / scan: set status to 0 if _STA failed * acpi-bus: ACPI / bus: Show _OSC UUID when _OSC fails ACPI / bus: Tidy up _OSC error spacing * acpi-osl: ACPI / OSL: Add kerneldoc comments to memory mapping functions * acpi-pm: ACPI / PM: Support D3 COLD device in old BIOS for ZPODD

ACPI / bus: Show _OSC UUID when _OSC fails

2015-12-22T01:51:41+00:00

When _OSC fails and especially when it fails due to an invalid UUID, it's helpful to show the UUID that we tried. Acked-by: Bjorn Helgaas Signed-off-by: Andy Lutomirski Signed-off-by: Rafael J. Wysocki

ACPI / bus: Tidy up _OSC error spacing

2015-12-22T01:51:41+00:00

The whitespace in _OSC error reports is weird. Improve it. Acked-by: Bjorn Helgaas Signed-off-by: Andy Lutomirski Signed-off-by: Rafael J. Wysocki

ACPI / debugger: Add module support for ACPI debugger

2015-12-14T23:17:44+00:00

This patch converts AML debugger into a loadable module. Note that, it implements driver unloading at the level dependent on the module reference count. Which means if ACPI debugger is being used by a userspace program, "rmmod acpi_dbg" should result in failure. Signed-off-by: Lv Zheng Signed-off-by: Rafael J. Wysocki

ACPI / debugger: Add IO interface to access debugger functionalities

2015-12-14T23:17:44+00:00

This patch adds /sys/kernel/debug/acpi/acpidbg, which can be used by userspace programs to access ACPICA debugger functionalities. Known issue: 1. IO flush support acpi_os_notify_command_complete() and acpi_os_wait_command_ready() can be used by acpi_dbg module to implement .flush() filesystem operation. While this patch doesn't go that far. It then becomes userspace tool's duty now to flush old commands before executing new batch mode commands. Signed-off-by: Lv Zheng Signed-off-by: Rafael J. Wysocki

ACPI: Eliminate CONFIG_.*{, _MODULE} #ifdef in favor of IS_ENABLED()

2015-09-15T01:05:45+00:00

This commit removes all CONFIG_.*{,_MODULE} in ACPI code, replacing it with IS_ENABLED(). Signed-off-by: Sudeep Holla Signed-off-by: Rafael J. Wysocki

Merge branch 'acpi-pm'

2015-09-01T01:38:43+00:00

* acpi-pm: ACPI / bus: Move duplicate code to a separate new function mfd: Add support for Intel Sunrisepoint LPSS devices dmaengine: add a driver for Intel integrated DMA 64-bit mfd: make mfd_remove_devices() iterate in reverse order driver core: implement device_for_each_child_reverse() klist: implement klist_prev() Driver core: wakeup the parent device before trying probe ACPI / PM: Attach ACPI power domain only once PM / QoS: Make it possible to expose device latency tolerance to userspace ACPI / PM: Update the copyright notice and description of power.c