[AMD Official Use Only - General] > -----Original Message----- > From: Meng, Li (Jassmine) <Li.Meng@xxxxxxx> > Sent: Wednesday, November 29, 2023 2:55 PM > To: Rafael J . Wysocki <rafael.j.wysocki@xxxxxxxxx>; Huang, Ray > <Ray.Huang@xxxxxxx> > Cc: linux-pm@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; x86@xxxxxxxxxx; > linux-acpi@xxxxxxxxxxxxxxx; Shuah Khan <skhan@xxxxxxxxxxxxxxxxxxx>; linux- > kselftest@xxxxxxxxxxxxxxx; Fontenot, Nathan <Nathan.Fontenot@xxxxxxx>; > Sharma, Deepak <Deepak.Sharma@xxxxxxx>; Deucher, Alexander > <Alexander.Deucher@xxxxxxx>; Limonciello, Mario > <Mario.Limonciello@xxxxxxx>; Huang, Shimmer <Shimmer.Huang@xxxxxxx>; > Yuan, Perry <Perry.Yuan@xxxxxxx>; Du, Xiaojian <Xiaojian.Du@xxxxxxx>; > Viresh Kumar <viresh.kumar@xxxxxxxxxx>; Borislav Petkov <bp@xxxxxxxxx>; > Oleksandr Natalenko <oleksandr@xxxxxxxxxxxxxx>; Meng, Li (Jassmine) > <Li.Meng@xxxxxxx>; Karny, Wyes <Wyes.Karny@xxxxxxx> > Subject: [PATCH V11 2/7] acpi: cppc: Add get the highest performance cppc > control > > 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. > > Tested-by: Oleksandr Natalenko <oleksandr@xxxxxxxxxxxxxx> > Reviewed-by: Mario Limonciello <mario.limonciello@xxxxxxx> > Reviewed-by: Wyes Karny <wyes.karny@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 > --- > 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 Reviewed-by: Perry Yuan <perry.yuan@xxxxxxx>
