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authorRafael J. Wysocki <rjw@sisk.pl>2010-02-17 23:39:08 +0100
committerJesse Barnes <jbarnes@virtuousgeek.org>2010-02-22 16:20:31 -0800
commitc7f486567c1d0acd2e4166c47069835b9f75e77b (patch)
tree5552890ac80fc53f61dd9c53a6211610375efa1f /Documentation
parent58ff463396ad00828e922d50998787e97fd32512 (diff)
PCI PM: PCIe PME root port service driver
PCIe native PME detection mechanism is based on interrupts generated by root ports or event collectors every time a PCIe device sends a PME message upstream. Once a PME message has been sent by an endpoint device and received by its root port (or event collector in the case of root complex integrated endpoints), the Requester ID from the message header is registered in the root port's Root Status register. At the same time, the PME Status bit of the Root Status register is set to indicate that there's a PME to handle. If PCIe PME interrupt is enabled for the root port, it generates an interrupt once the PME Status has been set. After receiving the interrupt, the kernel can identify the PCIe device that generated the PME using the Requester ID from the root port's Root Status register. [For details, see PCI Express Base Specification, Rev. 2.0.] Implement a driver for the PCIe PME root port service working in accordance with the above description. Based on a patch from Shaohua Li <shaohua.li@intel.com>. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/kernel-parameters.txt6
1 files changed, 6 insertions, 0 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index e7848a0d99e..747a2c8f62f 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -1998,6 +1998,12 @@ and is between 256 and 4096 characters. It is defined in the file
force Enable ASPM even on devices that claim not to support it.
WARNING: Forcing ASPM on may cause system lockups.
+ pcie_pme= [PCIE,PM] Native PCIe PME signaling options:
+ off Do not use native PCIe PME signaling.
+ force Use native PCIe PME signaling even if the BIOS refuses
+ to allow the kernel to control the relevant PCIe config
+ registers.
+
pcmv= [HW,PCMCIA] BadgePAD 4
pd. [PARIDE]