linux-kernel - [PATCH 2/2 v2] intel_pstate: add kernel parameter to enable loading on Sun X86 servers.

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Message-Id: <1416815458-25312-3-git-send-email-ethan.zhao@oracle.com>
Date:	Mon, 24 Nov 2014 16:50:58 +0900
From:	Ethan Zhao <ethan.zhao@...cle.com>
To:	linda.knippers@...com, viresh.kumar@...aro.org, rjw@...ysocki.net,
	corbet@....net, dirk.j.brandewie@...el.com
Cc:	linux-doc@...r.kernel.org, linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org, ethan.kernel@...il.com,
	Ethan Zhao <ethan.zhao@...cle.com>
Subject: [PATCH 2/2 v2] intel_pstate: add kernel parameter to enable loading on Sun X86 servers.

To force loading on Oracle Sun X86 servers, provide one kernel command line
parameter

  intel_pstate = onora

For those who be aware of the risk doing so.

Signed-off-by: Ethan Zhao <ethan.zhao@...cle.com>

v2: change the command line parameter naming to specific to Oracle Sun servers.
---
 Documentation/kernel-parameters.txt | 3 +++
 drivers/cpufreq/intel_pstate.c      | 6 +++++-
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 479f332..e4b1b81 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -1446,6 +1446,9 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
 		       disable
 		         Do not enable intel_pstate as the default
 		         scaling driver for the supported processors
+		       onora
+		         Enable loading intel_pstate on Oracle Sun Servers(X86).
+			 only for those who be aware of the risk.
 
 	intremap=	[X86-64, Intel-IOMMU]
 			on	enable Interrupt Remapping (default)
diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
index dacc15a..f28c725 100644
--- a/drivers/cpufreq/intel_pstate.c
+++ b/drivers/cpufreq/intel_pstate.c
@@ -866,6 +866,7 @@ static struct cpufreq_driver intel_pstate_driver = {
 };
 
 static int __initdata no_load;
+static unsigned int  load_on_sun;
 
 static int intel_pstate_msrs_not_valid(void)
 {
@@ -987,7 +988,8 @@ static bool intel_pstate_platform_pwr_mgmt_exists(void)
 			return true;
 	}
 	if (!strncmp(hdr.oem_id, vendor_info[1].oem_id, ACPI_OEM_ID_SIZE) &&
-		intel_pstate_has_acpi_ppc())
+		intel_pstate_has_acpi_ppc() &&
+		!load_on_sun)
 		return true;
 
 	return false;
@@ -1061,6 +1063,8 @@ static int __init intel_pstate_setup(char *str)
 
 	if (!strcmp(str, "disable"))
 		no_load = 1;
+	if (!strcmp(str, "onora"))
+		load_on_sun = 1;
 	return 0;
 }
 early_param("intel_pstate", intel_pstate_setup);
-- 
1.8.3.1

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