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. v4: - move setting processor capabilities bits into arch code - move workaround for mwait to acpi/x86 directory - rename ACPI_PDC* constants to more generic ACPI_PROC_CAP* - introduce new function acpi_early_processor_control_setup() 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 (9): acpi: Move mwait quirk out of acpi_processor.c acpi: Move processor_physically_present() to acpi_processor.c acpi: Refactor arch_acpi_set_pdc_bits() acpi: Rename ACPI_PDC constants acpi: Clear C_C2C3_FFH and C_C1_FFH in arch_acpi_set_proc_cap_bits() acpi: Move setting CAP_SMP_T_SWCOORD to arch_acpi_set_proc_cap_bits() acpi: Introduce acpi_processor_osc() acpi: Use _OSC method to convey processor OSPM capabilities acpi: Remove acpi_hwp_native_thermal_lvt_osc() arch/ia64/include/asm/acpi.h | 6 +- arch/x86/include/asm/acpi.h | 24 ++++--- arch/x86/xen/enlighten_pv.c | 8 +-- drivers/acpi/acpi_processor.c | 121 +++++++++++++++++++++++++--------- drivers/acpi/bus.c | 5 +- drivers/acpi/internal.h | 10 ++- drivers/acpi/processor_pdc.c | 97 +-------------------------- drivers/acpi/x86/utils.c | 35 ++++++++++ include/acpi/pdc_intel.h | 36 ---------- include/acpi/proc_cap_intel.h | 40 +++++++++++ 10 files changed, 194 insertions(+), 188 deletions(-) delete mode 100644 include/acpi/pdc_intel.h create mode 100644 include/acpi/proc_cap_intel.h -- 2.41.0
