RE: [PCIe spec question] How to get PCI express link up / link down notifications?
Rajat Jain <[email protected]>
| Newsgroups | gmane.linux.newbie,gmane.linux.kernel.pci,gmane.linux.hotplug.devel,gmane.linux.kernel.kernelnewbies |
|---|---|
| Message-ID | <e0827cdb950044ba8931a544a10e0ebb@BN1PR05MB123.namprd05.prod.outlook.com> |
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, > > greg k-h > -- > To unsubscribe from this list: send the line "unsubscribe linux-pci" in > the body of a message to [email protected] More majordomo info > at http://vger.kernel.org/majordomo-info.html > -- To unsubscribe from this list: send the line "unsubscribe linux-newbie" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.linux-learn.org/faqs