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Commit 26717172 authored by Len Brown's avatar Len Brown
Browse files

intel_idle: native hardware cpuidle driver for latest Intel processors 



This EXPERIMENTAL driver supersedes acpi_idle on
Intel Atom Processors, Intel Core i3/i5/i7 Processors
and associated Intel Xeon processors.

It does not support the Intel Core2 processor or earlier.

For kernels configured with ACPI, CONFIG_INTEL_IDLE=y
allows intel_idle to probe before the ACPI processor driver.
Booting with "intel_idle.max_cstate=0" disables intel_idle
and the system will fall back on ACPI's "acpi_idle".

Typical Linux distributions load ACPI processor module early,
making CONFIG_INTEL_IDLE=m not easily useful on ACPI platforms.

intel_idle probes all processors at module_init time.
Processors that are hot-added later will be limited
to using C1 in idle.

Signed-off-by: default avatarLen Brown <len.brown@intel.com>
parent 02cf4f98

MAINTAINERS

+7 −0
Original line number Diff line number Diff line
@@ -2850,6 +2850,13 @@ T: git git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input.git 
S:	Maintained

F:	drivers/input/



INTEL IDLE DRIVER

M:	Len Brown <lenb@kernel.org>

L:	linux-pm@lists.linux-foundation.org

T:	git git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-idle-2.6.git

S:	Supported

F:	drivers/idle/intel_idle.c



INTEL FRAMEBUFFER DRIVER (excluding 810 and 815)

M:	Maik Broemme <mbroemme@plusserver.de>

L:	linux-fbdev@vger.kernel.org

drivers/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -10,6 +10,7 @@ obj-$(CONFIG_PCI) += pci/ 
obj-$(CONFIG_PARISC)		+= parisc/

obj-$(CONFIG_RAPIDIO)		+= rapidio/

obj-y				+= video/

obj-y				+= idle/

obj-$(CONFIG_ACPI)		+= acpi/

obj-$(CONFIG_SFI)		+= sfi/

# PnP must come after ACPI since it will eventually need to check if acpi
@@ -91,7 +92,6 @@ obj-$(CONFIG_EISA) += eisa/ 
obj-y				+= lguest/

obj-$(CONFIG_CPU_FREQ)		+= cpufreq/

obj-$(CONFIG_CPU_IDLE)		+= cpuidle/

obj-y				+= idle/

obj-$(CONFIG_MMC)		+= mmc/

obj-$(CONFIG_MEMSTICK)		+= memstick/

obj-$(CONFIG_NEW_LEDS)		+= leds/

drivers/acpi/processor_driver.c

+5 −1
Original line number Diff line number Diff line
@@ -922,9 +922,13 @@ static int __init acpi_processor_init(void) 
		return -ENOMEM;

#endif



	if (!cpuidle_register_driver(&acpi_idle_driver))

	if (!cpuidle_register_driver(&acpi_idle_driver)) {

		printk(KERN_DEBUG "ACPI: %s registered with cpuidle\n",

			acpi_idle_driver.name);

	} else {

		printk(KERN_DEBUG "ACPI: acpi_idle yielding to %s",

			cpuidle_get_driver()->name);

	}



	result = acpi_bus_register_driver(&acpi_processor_driver);

	if (result < 0)

drivers/idle/Kconfig

+11 −0
Original line number Diff line number Diff line 
config INTEL_IDLE

	tristate "Cpuidle Driver for Intel Processors"

	depends on CPU_IDLE

	depends on X86

	depends on CPU_SUP_INTEL

	depends on EXPERIMENTAL

	help

	  Enable intel_idle, a cpuidle driver that includes knowledge of

	  native Intel hardware idle features.  The acpi_idle driver

	  can be configured at the same time, in order to handle

	  processors intel_idle does not support.



menu "Memory power savings"

depends on X86_64

drivers/idle/Makefile

+1 −0
Original line number Diff line number Diff line 
obj-$(CONFIG_I7300_IDLE)			+= i7300_idle.o

obj-$(CONFIG_INTEL_IDLE)			+= intel_idle.o