From: Meng Li <li.meng@xxxxxxx> commit 12753d71e8c5c3e716cedba23ddeed508da0bdc4 upstream. Add support for getting the highest performance to the generic CPPC driver. This enables downstream drivers such as amd-pstate to discover and use these values. Refer to Chapter 8.4.6.1.1.1. Highest Performance of ACPI Specification 6.5 for details on continuous performance control of CPPC (linked below). Tested-by: Oleksandr Natalenko <oleksandr@xxxxxxxxxxxxxx> Reviewed-by: Mario Limonciello <mario.limonciello@xxxxxxx> Reviewed-by: Wyes Karny <wyes.karny@xxxxxxx> Reviewed-by: Perry Yuan <perry.yuan@xxxxxxx> Acked-by: Huang Rui <ray.huang@xxxxxxx> Signed-off-by: Meng Li <li.meng@xxxxxxx> Link: https://uefi.org/specs/ACPI/6.5/08_Processor_Configuration_and_Control.html?highlight=cppc#highest-performance [ rjw: Subject and changelog edits ] Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/acpi/cppc_acpi.c | 13 +++++++++++++ include/acpi/cppc_acpi.h | 5 +++++ 2 files changed, 18 insertions(+) --- a/drivers/acpi/cppc_acpi.c +++ b/drivers/acpi/cppc_acpi.c @@ -1197,6 +1197,19 @@ int cppc_get_nominal_perf(int cpunum, u6 } /** + * cppc_get_highest_perf - Get the highest performance register value. + * @cpunum: CPU from which to get highest performance. + * @highest_perf: Return address. + * + * Return: 0 for success, -EIO otherwise. + */ +int cppc_get_highest_perf(int cpunum, u64 *highest_perf) +{ + return cppc_get_perf(cpunum, HIGHEST_PERF, highest_perf); +} +EXPORT_SYMBOL_GPL(cppc_get_highest_perf); + +/** * cppc_get_epp_perf - Get the epp register value. * @cpunum: CPU from which to get epp preference value. * @epp_perf: Return address. --- a/include/acpi/cppc_acpi.h +++ b/include/acpi/cppc_acpi.h @@ -139,6 +139,7 @@ struct cppc_cpudata { #ifdef CONFIG_ACPI_CPPC_LIB extern int cppc_get_desired_perf(int cpunum, u64 *desired_perf); extern int cppc_get_nominal_perf(int cpunum, u64 *nominal_perf); +extern int cppc_get_highest_perf(int cpunum, u64 *highest_perf); extern int cppc_get_perf_ctrs(int cpu, struct cppc_perf_fb_ctrs *perf_fb_ctrs); extern int cppc_set_perf(int cpu, struct cppc_perf_ctrls *perf_ctrls); extern int cppc_set_enable(int cpu, bool enable); @@ -165,6 +166,10 @@ static inline int cppc_get_nominal_perf( { return -ENOTSUPP; } +static inline int cppc_get_highest_perf(int cpunum, u64 *highest_perf) +{ + return -ENOTSUPP; +} static inline int cppc_get_perf_ctrs(int cpu, struct cppc_perf_fb_ctrs *perf_fb_ctrs) { return -ENOTSUPP; Patches currently in stable-queue which might be from li.meng@xxxxxxx are queue-6.6/cpufreq-amd-pstate-enable-amd-pstate-preferred-core-support.patch queue-6.6/acpi-cppc-add-helper-to-get-the-highest-performance-value.patch
