Commit 27471fdb authored by Andy Henroid's avatar Andy Henroid Committed by Len Brown
Browse files

i7300_idle driver v1.55 



The Intel 7300 Memory Controller supports dynamic throttling of memory which can
be used to save power when system is idle. This driver does the memory
throttling when all CPUs are idle on such a system.

Refer to "Intel 7300 Memory Controller Hub (MCH)" datasheet
for the config space description.

Signed-off-by: default avatarAndy Henroid <andrew.d.henroid@intel.com>
Signed-off-by: default avatarLen Brown <len.brown@intel.com>
Signed-off-by: default avatarVenkatesh Pallipadi <venkatesh.pallipadi@intel.com>
parent c7d87d79

MAINTAINERS

+6 −0
Original line number Diff line number Diff line
@@ -2078,6 +2078,12 @@ L: linux-ide@vger.kernel.org 
L:	linux-scsi@vger.kernel.org

S:	Orphan



IDLE-I7300

P:	Andy Henroid

M:	andrew.d.henroid@intel.com

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

S:	Supported



IEEE 1394 SUBSYSTEM (drivers/ieee1394)

P:	Ben Collins

M:	ben.collins@ubuntu.com

arch/x86/Kconfig

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@@ -1536,6 +1536,8 @@ source "arch/x86/kernel/cpu/cpufreq/Kconfig" 


source "drivers/cpuidle/Kconfig"



source "drivers/idle/Kconfig"



endmenu

drivers/Makefile

+1 −0
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@@ -82,6 +82,7 @@ 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/dma/ioat_dma.c

+3 −0
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@@ -171,6 +171,9 @@ static int ioat_dma_enumerate_channels(struct ioatdma_device *device) 
	xfercap_scale = readb(device->reg_base + IOAT_XFERCAP_OFFSET);

	xfercap = (xfercap_scale == 0 ? -1 : (1UL << xfercap_scale));



#if CONFIG_I7300_IDLE_IOAT_CHANNEL

	device->common.chancnt--;

#endif

	for (i = 0; i < device->common.chancnt; i++) {

		ioat_chan = kzalloc(sizeof(*ioat_chan), GFP_KERNEL);

		if (!ioat_chan) {

drivers/idle/Kconfig

0 → 100644
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menu "Memory power savings"



config I7300_IDLE_IOAT_CHANNEL

	bool



config I7300_IDLE

	tristate "Intel chipset idle power saving driver"

	select I7300_IDLE_IOAT_CHANNEL

	depends on X86_64

	help

	  Enable idle power savings with certain Intel server chipsets.

	  The chipset must have I/O AT support, such as the Intel 7300.

	  The power savings depends on the type and quantity of DRAM devices.



endmenu

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