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>

diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
index ab2e100..1405b39 100644 (file)
--- 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)