Re: [PATCH 1/3] intel_pstate: skip the driver if Sun server has ACPI _PPC method

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On 11/18/2014 12:37 AM, 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>
---
  drivers/cpufreq/intel_pstate.c | 20 ++++++++++++++++++++
  1 file changed, 20 insertions(+)

diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
index 27bb6d3..5498eb0 100644
--- a/drivers/cpufreq/intel_pstate.c
+++ b/drivers/cpufreq/intel_pstate.c
@@ -943,6 +943,21 @@ 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;
+}
+
  struct hw_vendor_info {
  	u16  valid;
  	char oem_id[ACPI_OEM_ID_SIZE];
@@ -952,6 +967,7 @@ struct hw_vendor_info {
  /* Hardware vendor-specific info that has its own power management modes */
  static struct hw_vendor_info vendor_info[] = {
  	{1, "HP    ", "ProLiant"},
+	{1, "ORACLE", ""},
  	{0, "", ""},
  };


Does this apply to ALL oracle systems?

Is the presence or absense of the _PPC method configurable in the oracle BIOS?

@@ -969,12 +985,16 @@ static bool intel_pstate_platform_pwr_mgmt_exists(void)
  		    !strncmp(hdr.oem_table_id, v_info->oem_table_id, ACPI_OEM_TABLE_ID_SIZE) &&
  		    intel_pstate_no_acpi_pss())
  			return true;
+		if (!strncmp(hdr.oem_id, v_info->oem_id, ACPI_OEM_ID_SIZE) &&
+			intel_pstate_has_acpi_ppc())
+			return true;
  	}

  	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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