Re: [PATCH 1/2 V6] intel_pstate: skip this driver if Sun server has _PPC method

[ethan zhao <ethan.zhao@xxxxxxxxxx>]

Dirk,

On 2014/12/1 23:11, Dirk Brandewie wrote:
> On 11/30/2014 06:32 PM, Ethan Zhao wrote:
> > Oracle Sun X86 servers have dynamic power capping capability that 
> > works via
> > ACPI _PPC method etc, so skip loading this driver if Sun server has 
> > ACPI _PPC
> > enabled.
> >
> > Signed-off-by: Ethan Zhao <ethan.zhao@xxxxxxxxxx>
> > Signed-off-by: Dirk Brandewie <dirk.brandewie@xxxxxxxxx>
> > Tested-by: Linda Knippers <linda.knippers@xxxxxx>
>
> In the future you should not add other peoples Signed-off-by or Tested-by
> tags unless they have explicitly told you can do so. Other than that I
> am fine with this patch.
  Got it. many thanks.

  Ethan
> --Dirk
> > ---
> >    v2: fix break HP Proliant issue.
> >    v3: expand the hardware vendor list.
> >    v4: refine code.
> >    v5v6: change enum PCC to PPC.
> >
> >   drivers/cpufreq/intel_pstate.c | 45 
> > ++++++++++++++++++++++++++++++++++++++----
> >   1 file changed, 41 insertions(+), 4 deletions(-)
> >
> > diff --git a/drivers/cpufreq/intel_pstate.c 
> > b/drivers/cpufreq/intel_pstate.c
> > index 27bb6d3..1bb62ca 100644
> > --- a/drivers/cpufreq/intel_pstate.c
> > +++ b/drivers/cpufreq/intel_pstate.c
> > @@ -943,15 +943,46 @@ static bool intel_pstate_no_acpi_pss(void)
> >       return true;
> >   }
> >
> > +static bool intel_pstate_has_acpi_ppc(void)
> > +{
> > +    int i;
> > +
> > +    for_each_possible_cpu(i) {
> > +        struct acpi_processor *pr = per_cpu(processors, i);
> > +
> > +        if (!pr)
> > +            continue;
> > +        if (acpi_has_method(pr->handle, "_PPC"))
> > +            return true;
> > +    }
> > +    return false;
> > +}
> > +
> > +enum {
> > +    PSS,
> > +    PPC,
> > +};
> > +
> >   struct hw_vendor_info {
> >       u16  valid;
> >       char oem_id[ACPI_OEM_ID_SIZE];
> >       char oem_table_id[ACPI_OEM_TABLE_ID_SIZE];
> > +    int  oem_pwr_table;
> >   };
> >
> >   /* Hardware vendor-specific info that has its own power management 
> > modes */
> >   static struct hw_vendor_info vendor_info[] = {
> > -    {1, "HP    ", "ProLiant"},
> > +    {1, "HP    ", "ProLiant", PSS},
> > +    {1, "ORACLE", "X4-2    ", PPC},
> > +    {1, "ORACLE", "X4-2L   ", PPC},
> > +    {1, "ORACLE", "X4-2B   ", PPC},
> > +    {1, "ORACLE", "X3-2    ", PPC},
> > +    {1, "ORACLE", "X3-2L   ", PPC},
> > +    {1, "ORACLE", "X3-2B   ", PPC},
> > +    {1, "ORACLE", "X4470M2 ", PPC},
> > +    {1, "ORACLE", "X4270M3 ", PPC},
> > +    {1, "ORACLE", "X4270M2 ", PPC},
> > +    {1, "ORACLE", "X4170M2 ", PPC},
> >       {0, "", ""},
> >   };
> >
> > @@ -966,15 +997,21 @@ static bool 
> > intel_pstate_platform_pwr_mgmt_exists(void)
> >
> >       for (v_info = vendor_info; v_info->valid; v_info++) {
> >           if (!strncmp(hdr.oem_id, v_info->oem_id, ACPI_OEM_ID_SIZE) &&
> > -            !strncmp(hdr.oem_table_id, v_info->oem_table_id, 
> > ACPI_OEM_TABLE_ID_SIZE) &&
> > -            intel_pstate_no_acpi_pss())
> > -            return true;
> > +            !strncmp(hdr.oem_table_id, v_info->oem_table_id,
> > +                        ACPI_OEM_TABLE_ID_SIZE))
> > +            switch (v_info->oem_pwr_table) {
> > +            case PSS:
> > +                return intel_pstate_no_acpi_pss();
> > +            case PPC:
> > +                return intel_pstate_has_acpi_ppc();
> > +            }
> >       }
> >
> >       return false;
> >   }
> >   #else /* CONFIG_ACPI not enabled */
> >   static inline bool intel_pstate_platform_pwr_mgmt_exists(void) { 
> > return false; }
> > +static inline bool intel_pstate_has_acpi_ppc(void) { return false; }
> >   #endif /* CONFIG_ACPI */
> >
> >   static int __init intel_pstate_init(void)

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