On 11/24/2014 08:59 PM, Ethan Zhao wrote:
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@xxxxxxxxxx>
---
v2: change to hardware vendor specific naming parameter.
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.
What are the risks? What is the behaviour if platform power management is
enabled and intel_pstate is trying to control P state selection as well?
If intel_pstate will be able to successfully control P state selection
with platform power management enabled then how about the name "oracle_force"?
Also the documentation should say what the risks are.
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 fa67fb3..e49b050 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)
{
@@ -1005,7 +1006,8 @@ static bool intel_pstate_platform_pwr_mgmt_exists(void)
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_has_acpi_ppc())
+ intel_pstate_has_acpi_ppc() &&
+ !load_on_sun)
return true;
}
@@ -1080,6 +1082,8 @@ 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);
--
To unsubscribe from this list: send the line "unsubscribe linux-doc" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
