Matthew, What I am working on is a closed system, where a custom PCIe endpoint needs to send a message to the driver, which has some data. This message come in asynchronously. Since the data contained in this message is small enough that it can be encapsulated in a TLP, the choice is to see if we can do a send this message on directly to the CPU. I guess the issue is that if the message comes into the Root Complex, what does it do with it? Does it generate an ACPI general event, like it does for hotplug, or does it do something else like generate an interrupt to the CPU using what is configured in the device's configuration space. If like you mentioned, the implementation is not defined in the spec, so that would mean that if someone is using this feature, then they will need to handle one of the two scenarios previously mentioned. The question really was to see if someone is using it. Thanks, Arvind. ----- Original Message ---- From: Matthew Wilcox <matthew@xxxxxx> To: arvind vasudev <arvind_vasudev2000@xxxxxxxxx> Cc: linux-pci@xxxxxxxxxxxxxxx Sent: Tuesday, March 31, 2009 1:59:15 PM Subject: Re: Question about PCIe vendor defined message support On Tue, Mar 31, 2009 at 01:40:58PM -0700, arvind vasudev wrote: > > Thank you for the reply Matthew. > > The vendor defined messages are described in the PCIe spec section 2.2.8.6: > > http://www.pcisig.com/members/downloads/specifications/pciexpress/PCI_Express_Base_r2_1_04Mar09_cb.pdf Yes, I know what they are. The PCIe spec doesn't (as far as I can see) specify a way to generate Vendor Defined messages. Nor does it define what happens if you send one to a Root Complex. So I don't understand what you want Linux to do with them. Could you explain what you're trying to do? -- Matthew Wilcox Intel Open Source Technology Centre "Bill, look, we understand that you're interested in selling us this operating system, but compare it to ours. We can't possibly take such a retrograde step." -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
