Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752625AbaLACcx (ORCPT ); Sun, 30 Nov 2014 21:32:53 -0500 Received: from userp1040.oracle.com ([156.151.31.81]:19460 "EHLO userp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752178AbaLACcv (ORCPT ); Sun, 30 Nov 2014 21:32:51 -0500 From: Ethan Zhao To: dirk.j.brandewie@intel.com, linda.knippers@hp.com, viresh.kumar@linaro.org, rjw@rjwysocki.net, corbet@lwn.net Cc: linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, ethan.kernel@gmail.com, Ethan Zhao , Dirk Brandewie Subject: [PATCH 1/2 V6] intel_pstate: skip this driver if Sun server has _PPC method Date: Mon, 1 Dec 2014 11:32:08 +0900 Message-Id: <1417401128-32086-1-git-send-email-ethan.zhao@oracle.com> X-Mailer: git-send-email 1.8.3.1 X-Source-IP: ucsinet22.oracle.com [156.151.31.94] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 Signed-off-by: Dirk Brandewie Tested-by: Linda Knippers --- v2: fix break HP Proliant issue. v3: expand the hardware vendor list. v4: refine code. v5v6: change enum PCC to PPC. drivers/cpufreq/intel_pstate.c | 45 ++++++++++++++++++++++++++++++++++++++---- 1 file changed, 41 insertions(+), 4 deletions(-) diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c index 27bb6d3..1bb62ca 100644 --- a/drivers/cpufreq/intel_pstate.c +++ b/drivers/cpufreq/intel_pstate.c @@ -943,15 +943,46 @@ 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, "", ""}, }; @@ -966,15 +997,21 @@ 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) -- 1.8.3.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/