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 responsible for triggering _PDC execution was triggered correctly. Tested this using debug messages with printk. v3: - split into more commits to make review easier - changed "_UID" to METHOD_NAME_UID - changed hard-coded constant to ACPI_PDC_COLLAB_PROC_PERF - added Suggested-by tags - fixed style issues - fixed whitespaces - refactored code v2: - fixed compilation issues on ia64 and arm Michal Wilczynski (5): acpi: Move logic responsible for conveying processor OSPM capabilities acpi: Refactor arch_acpi_set_pdc_bits() acpi: Introduce new function callback for _OSC acpi: Use _OSC method to convey processor OSPM capabilities acpi: Remove acpi_hwp_native_thermal_lvt_osc() arch/ia64/include/asm/acpi.h | 4 +- arch/x86/include/asm/acpi.h | 13 +-- drivers/acpi/acpi_processor.c | 151 +++++++++++++++++++++++++++------- drivers/acpi/bus.c | 13 ++- drivers/acpi/internal.h | 10 +-- drivers/acpi/processor_pdc.c | 82 +----------------- include/acpi/pdc_intel.h | 1 + include/acpi/processor.h | 2 +- 8 files changed, 148 insertions(+), 128 deletions(-) -- 2.41.0
