lkml.org 
[lkml]   [2023]   [Aug]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    From
    Subject[PATCH V2 2/7] acpi: cppc: Add get the highest performance cppc control
    Date
    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>
    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
    \
     
     \ /
      Last update: 2023-08-15 08:17    [W:5.349 / U:0.024 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site