diff options
| author | ethan zhao <ethan.zhao@oracle.com> | 2014-12-01 11:32:08 +0900 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2014-12-03 02:56:04 +0100 |
| commit | 966916eabfb1726fec7ea7b69f0c7f5ce366e943 (patch) | |
| tree | b2628aa8e3637991059437d7412a340c6edc0ad3 /drivers/cpufreq/intel_pstate.c | |
| parent | 493b4cd285e68d8d8d5853a2536ea06f8cabeaeb (diff) | |
| download | talos-obmc-linux-966916eabfb1726fec7ea7b69f0c7f5ce366e943.tar.gz talos-obmc-linux-966916eabfb1726fec7ea7b69f0c7f5ce366e943.zip | |
intel_pstate: skip this driver if Sun server has _PPC method
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@oracle.com>
Tested-by: Linda Knippers <linda.knippers@hp.com>
Acked-by: Kristen Carlson Accardi <kristen@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/cpufreq/intel_pstate.c')
| -rw-r--r-- | drivers/cpufreq/intel_pstate.c | 45 |
1 files changed, 41 insertions, 4 deletions
diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c index ab2e100a1807..1405b393c93d 100644 --- a/drivers/cpufreq/intel_pstate.c +++ b/drivers/cpufreq/intel_pstate.c @@ -1025,15 +1025,46 @@ 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, "", ""}, }; @@ -1057,15 +1088,21 @@ 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) |
