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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 /include/linux/pci.h
parent58ff463396ad00828e922d50998787e97fd32512 (diff)
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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 'include/linux/pci.h')
-rw-r--r--include/linux/pci.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 578a0770961..9fe4b2089b7 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -266,6 +266,7 @@ struct pci_dev {
configuration space */
unsigned int pme_support:5; /* Bitmask of states from which PME#
can be generated */
+ unsigned int pme_interrupt:1;
unsigned int d1_support:1; /* Low power state D1 is supported */
unsigned int d2_support:1; /* Low power state D2 is supported */
unsigned int no_d1d2:1; /* Only allow D0 and D3 */