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    SubjectRe: [PATCH V3 2/7] acpi: cppc: Add get the highest performance cppc control
    Date
    On 24 Aug 10:12, Meng Li 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@amd.com>
    > Reviewed-by: Mario Limonciello <mario.limonciello@amd.com>
    Reviewed-by: Wyes Karny <wyes.karny@amd.com>

    > Link: https://uefi.org/specs/ACPI/6.5/08_Processor_Configuration_and_Control.html?highlight=cppc#cpc-continuous-performance-control
    > ---
    > 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
    >

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