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7d715a6c1a
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Shaohua Li 7d715a6c1a PCI: add PCI Express ASPM support 
PCI Express ASPM defines a protocol for PCI Express components in the D0
state to reduce Link power by placing their Links into a low power state
and instructing the other end of the Link to do likewise. This
capability allows hardware-autonomous, dynamic Link power reduction
beyond what is achievable by software-only controlled power management.
However, The device should be configured by software appropriately.
Enabling ASPM will save power, but will introduce device latency.

This patch adds ASPM support in Linux. It introduces a global policy for
ASPM, a sysfs file /sys/module/pcie_aspm/parameters/policy can control
it. The interface can be used as a boot option too. Currently we have
below setting:
        -default, BIOS default setting
        -powersave, highest power saving mode, enable all available ASPM
state and clock power management
        -performance, highest performance, disable ASPM and clock power
management
By default, the 'default' policy is used currently.

In my test, power difference between powersave mode and performance mode
is about 1.3w in a system with 3 PCIE links.

Note: some devices might not work well with aspm, either because chipset
issue or device issue. The patch provide API (pci_disable_link_state),
driver can disable ASPM for specific device.

Signed-off-by: Shaohua Li <shaohua.li@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2008-04-20 21:47:03 -07:00
..
acorn/char Fix default compose table initialization 2008-03-03 14:53:16 -08:00
acpi Add down_timeout and change ACPI to use it 2008-04-17 10:42:46 -04:00
amba
ata Merge git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6 2008-04-18 11:25:31 -07:00
atm [ATM] drivers/atm/horizon.c: stop inlining largish static functions 2008-04-13 21:54:34 -07:00
auxdisplay
base [SCSI] transport_class: BUG if we can't release the attribute container 2008-04-07 12:19:10 -05:00
block Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/torvalds/linux-2.6 2008-04-17 23:56:30 -07:00
bluetooth Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6 2008-03-12 13:08:09 -07:00
cdrom make cdrom.c:check_for_audio_disc() static 2008-03-04 11:28:41 +01:00
char Merge git://git.kernel.org/pub/scm/linux/kernel/git/mingo/linux-2.6-kgdb 2008-04-18 08:37:01 -07:00
clocksource
connector connector: convert to single-threaded workqueue 2008-03-23 21:51:12 -07:00
cpufreq [CPUFREQ] fix section mismatch warnings 2008-03-05 14:45:31 -05:00
cpuidle cpuidle: fix 100% C0 statistics regression 2008-03-26 00:58:19 -04:00
crypto [S390] zcrypt: add support for large random numbers 2008-04-17 07:47:02 +02:00
dca DCA: convert struct class_device to struct device. 2008-02-08 15:33:33 -08:00
dio dio: ARRAY_SIZE() cleanup 2008-02-05 09:44:23 -08:00
dma dmaengine: ack to flags: make use of the unused bits in the 'ack' field 2008-04-17 13:25:54 -07:00
edac drivers/edac/i3000: document type promotion 2008-02-07 08:42:23 -08:00
eisa
firewire firewire: cleanups 2008-04-18 17:55:37 +02:00
firmware ipmi: change device node ordering to reflect probe order 2008-04-04 14:46:26 -07:00
gpio gpio/pca953x bugfix: mark as can_sleep 2008-03-10 18:01:19 -07:00
hid HID: update key codes for Apple aluminium 2008-03-18 11:20:33 +01:00
hwmon hwmon: (w83781d) Fix I/O resource conflict with PNP 2008-03-27 08:40:41 -04:00
i2c i2c-tiny-usb: New VID/PID pair 2008-04-11 12:07:05 +02:00
ide ide: remove ide_init_default_irq() macro 2008-04-18 00:46:35 +02:00
ieee1394 ieee1394: limit early node speed to host interface speed 2008-04-18 17:55:31 +02:00
infiniband IB/iser: Don't change itt endianness 2008-04-16 21:09:35 -07:00
input Input: appletouch - add product IDs for the 4th generation MacBooks 2008-04-02 10:14:29 -04:00
isdn [ISDN]: Do not validate ISDN net device address prior to interface-up 2008-04-13 22:44:20 -07:00
leds leds: fix platform driver hotplug/coldplug 2008-04-15 19:35:40 -07:00
lguest misc __user misannotations (pointless casts to long) 2008-03-30 14:20:23 -07:00
macintosh ide: rework PowerMac media-bay support (take 2) 2008-04-18 00:46:23 +02:00
mca
md md: close a livelock window in handle_parity_checks5 2008-04-11 08:06:44 -07:00
media pvrusb2: fix broken build due to patch order dependency 2008-04-07 19:14:34 -07:00
memstick memstick: suppress uninitialized-var warning 2008-03-28 14:45:23 -07:00
message [SCSI] mpt fusion: fix up msi_enable in mpt_suspend 2008-04-07 12:19:02 -05:00
mfd mfd/asic3: ioread/iowrite take pointer, not unsigned long 2008-03-30 14:20:24 -07:00
misc kgdb: allow static kgdbts boot configuration 2008-04-17 20:05:43 +02:00
mmc mmc: fix platform driver hotplug/coldplug 2008-04-15 19:35:40 -07:00
mtd mtd/chips: add missing set_current_state() to cfi_{amdstd,staa}_sync() 2008-04-08 18:25:53 -07:00
net Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6.26 2008-04-18 18:02:35 -07:00
nubus nubus: kill drivers/nubus/nubus_syms.c 2008-02-05 09:44:23 -08:00
of [POWERPC] Create and hook up of_platform_device_shutdown 2008-02-06 16:29:59 +11:00
oprofile d_path: Make get_dcookie() use a struct path argument 2008-02-14 21:17:08 -08:00
parisc PCI: remove parisc consumer of the pci global_list 2008-04-20 21:47:01 -07:00
parport parport_pc: make sure to release IO ports after probing for IT87XX 2008-04-04 14:30:31 -07:00
pci PCI: add PCI Express ASPM support 2008-04-20 21:47:03 -07:00
pcmcia pcmcia: fix platform driver hotplug/coldplug 2008-04-15 19:35:40 -07:00
pnp pnpacpi: reduce printk severity for "pnpacpi: exceeded the max number of ..." 2008-03-26 14:22:20 -04:00
power Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-acpi-2.6 2008-02-07 09:45:58 -08:00
ps3 [POWERPC] PS3: Update sys-manager button events 2008-02-14 22:11:01 +11:00
rapidio docbook: fix rapidio source files 2008-03-03 10:47:13 -08:00
rtc rtc: fix the error in the function of cmos_set_alarm 2008-04-15 19:35:40 -07:00
s390 Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6.26 2008-04-18 18:02:35 -07:00
sbus
scsi Merge git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6 2008-04-18 11:25:31 -07:00
serial kgdb: Kconfig fix 2008-04-17 20:05:42 +02:00
sh maple: fix device detection 2008-02-26 14:12:09 +09:00
sn ioc3.c: replace remaining __FUNCTION__ occurrences 2008-03-17 08:11:48 -04:00
spi spi: spi_s3c24xx must initialize num_chipselect 2008-04-15 19:35:41 -07:00
ssb Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/torvalds/linux-2.6 2008-04-17 23:56:30 -07:00
tc
telephony
thermal acpi thermal trip points increased to 12 2008-04-15 19:35:41 -07:00
uio UIO: add pgprot_noncached() to UIO mmap code 2008-03-24 22:33:49 -07:00
usb USB: remove broken usb-serial num_endpoints check 2008-04-15 22:30:53 -07:00
video fbdev: fix /proc/fb oops after module removal 2008-04-15 19:35:40 -07:00
virtio virtio: remove overzealous BUG_ON. 2008-04-07 13:14:22 -07:00
w1 ds1wm: report bus reset error 2008-03-04 16:35:12 -08:00
watchdog watchdog: fix platform driver hotplug/coldplug 2008-04-11 08:06:44 -07:00
xen xen: fix grant table bug 2008-04-04 18:36:46 +02:00
zorro
Kconfig memstick: initial commit for Sony MemoryStick support 2008-02-09 11:08:34 -08:00
Makefile memstick: initial commit for Sony MemoryStick support 2008-02-09 11:08:34 -08:00