TWxSoftware/twx-linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

[IA64] Add ACPI based P-state support

Browse Source 
Patch to support P-state transitions on ia64. This driver is based on ACPI,
and uses the ACPI processor driver interface to find out the P-state support
information for the processor. This driver plugs into generic cpufreq
infrastructure.

Once this driver is loaded successfully, ondemand/userspace governor can be
used to change the CPU frequency dynamically based on load or on request from
userspace process.

Refer :
ACPI specification -
      http://www.acpi.info
P-state related PAL calls -
      http://developer.intel.com/design/itanium/downloads/24869909.pdf

Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
This commit is contained in:
Venkatesh Pallipadi
2005-07-29 16:15:00 -07:00
committed by Tony Luck
parent fd589e0b66
commit 4db8699bcf
7 changed files with 562 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files
include/asm-ia64/acpi.h
+5
View File
@@ -116,6 +116,11 @@ extern int __initdata nid_to_pxm_map[MAX_NUMNODES];
extern u16 ia64_acpiid_to_sapicid[];
/*
* Refer Intel ACPI _PDC support document for bit definitions
*/
#define ACPI_PDC_EST_CAPABILITY_SMP 0x8
#endif /*__KERNEL__*/
#endif /*_ASM_ACPI_H*/