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Commit 966916ea authored by ethan zhao's avatar ethan zhao Committed by Rafael J. Wysocki
Browse files

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: default avatarEthan Zhao <ethan.zhao@oracle.com>
Tested-by: default avatarLinda Knippers <linda.knippers@hp.com>
Acked-by: default avatarKristen Carlson Accardi <kristen@linux.intel.com>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent 493b4cd2

drivers/cpufreq/intel_pstate.c

+41 −4
Original line number Diff line number Diff line
@@ -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)