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>
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@ -1025,15 +1025,46 @@ static bool intel_pstate_no_acpi_pss(void)
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return true;
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}
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static bool intel_pstate_has_acpi_ppc(void)
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{
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int i;
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for_each_possible_cpu(i) {
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struct acpi_processor *pr = per_cpu(processors, i);
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if (!pr)
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continue;
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if (acpi_has_method(pr->handle, "_PPC"))
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return true;
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}
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return false;
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}
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enum {
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PSS,
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PPC,
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};
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struct hw_vendor_info {
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u16 valid;
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char oem_id[ACPI_OEM_ID_SIZE];
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char oem_table_id[ACPI_OEM_TABLE_ID_SIZE];
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int oem_pwr_table;
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};
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/* Hardware vendor-specific info that has its own power management modes */
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static struct hw_vendor_info vendor_info[] = {
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{1, "HP ", "ProLiant"},
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{1, "HP ", "ProLiant", PSS},
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{1, "ORACLE", "X4-2 ", PPC},
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{1, "ORACLE", "X4-2L ", PPC},
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{1, "ORACLE", "X4-2B ", PPC},
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{1, "ORACLE", "X3-2 ", PPC},
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{1, "ORACLE", "X3-2L ", PPC},
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{1, "ORACLE", "X3-2B ", PPC},
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{1, "ORACLE", "X4470M2 ", PPC},
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{1, "ORACLE", "X4270M3 ", PPC},
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{1, "ORACLE", "X4270M2 ", PPC},
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{1, "ORACLE", "X4170M2 ", PPC},
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{0, "", ""},
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};
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@ -1057,15 +1088,21 @@ static bool intel_pstate_platform_pwr_mgmt_exists(void)
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for (v_info = vendor_info; v_info->valid; v_info++) {
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if (!strncmp(hdr.oem_id, v_info->oem_id, ACPI_OEM_ID_SIZE) &&
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!strncmp(hdr.oem_table_id, v_info->oem_table_id, ACPI_OEM_TABLE_ID_SIZE) &&
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intel_pstate_no_acpi_pss())
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return true;
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!strncmp(hdr.oem_table_id, v_info->oem_table_id,
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ACPI_OEM_TABLE_ID_SIZE))
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switch (v_info->oem_pwr_table) {
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case PSS:
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return intel_pstate_no_acpi_pss();
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case PPC:
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return intel_pstate_has_acpi_ppc();
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}
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}
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return false;
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}
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#else /* CONFIG_ACPI not enabled */
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static inline bool intel_pstate_platform_pwr_mgmt_exists(void) { return false; }
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static inline bool intel_pstate_has_acpi_ppc(void) { return false; }
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#endif /* CONFIG_ACPI */
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static int __init intel_pstate_init(void)
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