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authorShaohua Li <shaohua.li@intel.com>2008-01-24 10:21:57 +0800
committerGreg Kroah-Hartman <gregkh@suse.de>2008-02-01 15:04:30 -0800
commit6c723d5bd89f03fc3ef627d50f89ade054d2ee3b (patch)
tree45fcf8a380b48ddf686456ff65a2234c23c05504 /include/linux/pci.h
parent5c796ae7a7ebe56967ed9b9963d7c16d733635ff (diff)
PCI: PCIE 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. Signed-off-by: Shaohua Li <shaohua.li@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'include/linux/pci.h')
-rw-r--r--include/linux/pci.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 13813b0592f..163b4524172 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -128,6 +128,7 @@ struct pci_cap_saved_state {
u32 data[0];
};
+struct pcie_link_state;
/*
* The pci_dev structure is used to describe PCI devices.
*/
@@ -163,6 +164,10 @@ struct pci_dev {
this is D0-D3, D0 being fully functional,
and D3 being off. */
+#ifdef CONFIG_PCIEASPM
+ struct pcie_link_state *link_state; /* ASPM link state. */
+#endif
+
pci_channel_state_t error_state; /* current connectivity state */
struct device dev; /* Generic device interface */