(2014/11/28 12:36), 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>
> ---
> v2: fix break HP Proliant issue.
> v3: expand the hardware vendor list.
> v4: refine code.
>
> 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,
> + PCC,
> +};
What does PCC stand for? Is it PPC?
Thanks,
Yasuaki Ishimatsu
> +
> 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 ", PCC},
> + {1, "ORACLE", "X4-2L ", PCC},
> + {1, "ORACLE", "X4-2B ", PCC},
> + {1, "ORACLE", "X3-2 ", PCC},
> + {1, "ORACLE", "X3-2L ", PCC},
> + {1, "ORACLE", "X3-2B ", PCC},
> + {1, "ORACLE", "X4470M2 ", PCC},
> + {1, "ORACLE", "X4270M3 ", PCC},
> + {1, "ORACLE", "X4270M2 ", PCC},
> + {1, "ORACLE", "X4170M2 ", PCC},
> {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 PCC:
> + 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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