Hello Greg,

On Fri, Oct 04, 2013 at 01:40:49AM +0000, Rajat Jain wrote:

...

Hello,

I have a HW which is not compliant with the PCI Express hot-plug (as described in the PCI express spec) because the HP signals from the downstream port are simply not connected. And I have a PCI express endpoint, that in the course of its life, will routinely undergo power-off and power-on on cycles. Hence the PCIe link to this device is expected to come down, and come up as part of regular operation.

What hardware is this? Why not ask the manufacturer of it as they are the ones in control of this type of thing.

OK, Understood :-). Actually my question was generic. For e.g. say I have a topology where root port connects to a PCIe switch-1 that in turn connects to a PCIe switch-2. My question is if the PCIe link between the switch-1 and switch-2 goes down or up for some reason (say a power fault, or due to RESET pin assertion on the switch etc), is there a way to get notification interrupt at the root port or CPU? Essentially I am looking for a notification from downstream port of switch-1, that it saw a change in the link status.

...

I'm reading the PCI express spec trying to understand if it is possible to get notification interrupts, whenever the PCIe link to this device goes down or goes up. Can someone please help me understand if it is possible?

Notification where?

Notification to the CPU via the root port. Thanks a bunch, Rajat

thanks,

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