On Tue, Sep 05, 2023 at 09:51:11AM +0800, Meng, Li (Jassmine) wrote: > 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. > > Please refer to the ACPI_Spec for details on continuous > performance control of CPPC. > > Signed-off-by: Meng Li <li.meng@xxxxxxx> > Reviewed-by: Mario Limonciello <mario.limonciello@xxxxxxx> > Reviewed-by: Wyes Karny <wyes.karny@xxxxxxx> > Link: https://uefi.org/specs/ACPI/6.5/08_Processor_Configuration_and_Control.html?highlight=cppc#cpc-continuous-performance-control Acked-by: Huang Rui <ray.huang@xxxxxxx> > --- > drivers/acpi/cppc_acpi.c | 13 +++++++++++++ > include/acpi/cppc_acpi.h | 5 +++++ > 2 files changed, 18 insertions(+) > > diff --git a/drivers/acpi/cppc_acpi.c b/drivers/acpi/cppc_acpi.c > index 7ff269a78c20..ad388a0e8484 100644 > --- a/drivers/acpi/cppc_acpi.c > +++ b/drivers/acpi/cppc_acpi.c > @@ -1154,6 +1154,19 @@ int cppc_get_nominal_perf(int cpunum, u64 *nominal_perf) > return cppc_get_perf(cpunum, NOMINAL_PERF, nominal_perf); > } > > +/** > + * 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. > diff --git a/include/acpi/cppc_acpi.h b/include/acpi/cppc_acpi.h > index 6126c977ece0..c0b69ffe7bdb 100644 > --- 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(int cpunum, u64 *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; > -- > 2.34.1 >
