From: dirk.brandewie@gmail.com
To: rjw@sisk.pl
Cc: linux-kernel@vger.kernel.org, cpufreq@vger.kernel.org,
Dirk Brandewie <dirk.brandewie@gmail.com>,
Dirk Brandewie <dirk.j.brandewie@intel.com>
Subject: [PATCH] cpufreq/intel_pstate: Add kernel command line option disable intel_pstate.
Date: Thu, 14 Feb 2013 10:38:52 -0800 [thread overview]
Message-ID: <1360867132-13004-1-git-send-email-dirk.brandewie@gmail.com> (raw)
In-Reply-To: <6075901.uWCJMxDDFf@vostro.rjw.lan>
From: Dirk Brandewie <dirk.brandewie@gmail.com>
When intel_pstate is configured into the kernel it will become the
perferred scaling driver for processors that is supports. Allow the
user to override this by adding:
intel_pstate=disable
on the kernel command line.
Signed-off-by: Dirk Brandewie <dirk.j.brandewie@intel.com>
---
Documentation/kernel-parameters.txt | 5 +++++
drivers/cpufreq/intel_pstate.c | 16 ++++++++++++++++
2 files changed, 21 insertions(+), 0 deletions(-)
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 6c72381..41c5d9e 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -1131,6 +1131,11 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
0 disables intel_idle and fall back on acpi_idle.
1 to 6 specify maximum depth of C-state.
+ intel_pstate= [X86]
+ disable
+ Do not enable intel_pstate as the default
+ scaling driver for the supported processors
+
intremap= [X86-64, Intel-IOMMU]
on enable Interrupt Remapping (default)
off disable Interrupt Remapping
diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
index e879963..9cbb733 100644
--- a/drivers/cpufreq/intel_pstate.c
+++ b/drivers/cpufreq/intel_pstate.c
@@ -773,11 +773,16 @@ static void intel_pstate_exit(void)
}
module_exit(intel_pstate_exit);
+static int no_load;
+
static int __init intel_pstate_init(void)
{
int rc = 0;
const struct x86_cpu_id *id;
+ if (no_load)
+ return -ENODEV;
+
id = x86_match_cpu(intel_pstate_cpu_ids);
if (!id)
return -ENODEV;
@@ -802,6 +807,17 @@ out:
}
device_initcall(intel_pstate_init);
+static int __init intel_pstate_setup(char *str)
+{
+ if (!str)
+ return -EINVAL;
+
+ if (!strcmp(str, "disable"))
+ no_load = 1;
+ return 0;
+}
+early_param("intel_pstate", intel_pstate_setup);
+
MODULE_AUTHOR("Dirk Brandewie <dirk.j.brandewie@intel.com>");
MODULE_DESCRIPTION("'intel_pstate' - P state driver Intel Core processors");
MODULE_LICENSE("GPL");
--
1.7.7.6
next prev parent reply other threads:[~2013-02-14 18:39 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-02-06 17:02 [PATCH 0/5] Add P state driver for Intel Core Processors dirk.brandewie
2013-02-06 17:02 ` [PATCH 1/5] cpufreq: Retrieve current frequency from scaling drivers with internal governors dirk.brandewie
2013-02-07 13:46 ` Viresh Kumar
2013-02-06 17:02 ` [PATCH 2/5] cpufreq: Only call cpufreq_out_of_sync() for driver that implement cpufreq_driver.target() dirk.brandewie
2013-02-06 17:02 ` [PATCH 2/5] cpufreq: Only call cpufreq_out_of_sync() with drivers " dirk.brandewie
2013-02-07 10:33 ` Viresh Kumar
2013-02-06 17:02 ` [PATCH 3/5] cpufreq: Do not track governor name for scaling drivers with internal governors dirk.brandewie
2013-02-07 10:43 ` Viresh Kumar
2013-02-07 13:45 ` Viresh Kumar
2013-02-06 17:02 ` [PATCH 4/5] cpufreq_stats: do not remove sysfs files if frequency table is not present dirk.brandewie
2013-02-06 17:02 ` [PATCH 5/5] cpufreq/x86: Add P-state driver for sandy bridge dirk.brandewie
2013-02-07 14:01 ` Viresh Kumar
2013-02-07 10:42 ` [PATCH 0/5] Add P state driver for Intel Core Processors Viresh Kumar
2013-02-07 14:02 ` Viresh Kumar
2013-02-07 22:43 ` Rafael J. Wysocki
2013-02-12 21:49 ` Dave Jones
2013-02-13 16:38 ` Dirk Brandewie
2013-02-13 21:17 ` Rafael J. Wysocki
2013-02-14 18:38 ` dirk.brandewie [this message]
2013-02-14 22:56 ` [PATCH] cpufreq/intel_pstate: Add kernel command line option disable intel_pstate Yinghai Lu
2013-02-15 4:23 ` Viresh Kumar
2013-02-15 12:30 ` Rafael J. Wysocki
2013-02-15 13:28 ` Viresh Kumar
2013-02-15 16:12 ` Dirk Brandewie
2013-02-15 16:15 ` dirk.brandewie
2013-02-14 4:08 ` [PATCH 0/5] Add P state driver for Intel Core Processors Viresh Kumar
2013-02-14 12:21 ` Rafael J. Wysocki
2013-02-14 15:23 ` Dirk Brandewie
2013-02-14 15:34 ` Dirk Brandewie
2013-02-14 17:36 ` Rafael J. Wysocki
2013-02-13 20:14 ` [PATCH] cpufreq/intel_pstate: Change to disallow module build dirk.brandewie
2013-02-13 20:14 ` dirk.brandewie
2013-02-14 16:10 ` Viresh Kumar
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