ACPI 3.0 introduced a new Operating System Capabilities _OSC control method. This method is similar to _PDC, which was marked as deprecated in ACPI 3.0. Prefer using _OSC method over deprecated _PDC in the acpi_bus_init(). In case of the failure of the _OSC, try using _PDC as a fallback. Testing done: Tested on physical server with BIOS implementing _OSC methods. In this case acpi_processor_osc() was executed for each CPU core. acpi_run_osc() returned success indicating that _OSC method succeeded. Tested on qemu VM to check whether the code would work on a SeaBios (the default for qemu, doesn't support _OSC methods, or _PDC). This way I was able to see how code behaves in case BIOS doesn't implement _OSC. In that case the function acpi_run_osc() returned failure, which propagated all the way up to acpi_early_processor_osc(). The logic reponsible for triggering _PDC execution was triggered correctly. Tested this using debug messages with printk. v2: - fixed compilation issues on ia64 and arm Michal Wilczynski (2): acpi: Use _OSC method to convey processor OSPM capabilities acpi: Move logic responsible for conveying processor OSPM capabilities arch/ia64/include/asm/acpi.h | 4 +- arch/x86/include/asm/acpi.h | 12 ++-- drivers/acpi/acpi_processor.c | 130 ++++++++++++++++++++++++++++------ drivers/acpi/bus.c | 11 +-- drivers/acpi/internal.h | 7 +- drivers/acpi/processor_pdc.c | 82 +-------------------- include/acpi/pdc_intel.h | 1 + include/acpi/processor.h | 2 +- 8 files changed, 133 insertions(+), 116 deletions(-) -- 2.40.1
