On Tue, May 03, 2016 at 05:02:45PM +0800, Yong, Jonathan wrote: > On 04/29/2016 22:17, Bjorn Helgaas wrote: > >On Tue, Apr 19, 2016 at 06:29:17AM +0000, Yong, Jonathan wrote: > >>Hello LKML, > >> > >>This is a preliminary implementation of the PTM[1] support driver. This driver > >>has only been tested against a virtual PCI bus since there are no known > >>endpoints utilizing it yet. > > > >What sort of testing is this, exactly? Is this using a software model > >of devices that support PTM? > > > > We wrote another driver to fake the PCI config space with > pci_scan_bus, with fake switches and fake devices. Convenient since > the driver only deals with the config space. > > >When will hardware that supports PTM be available to you for testing? > >When will it be available on the market? > > > > I don't have any dates for when consumer endpoints will hit the > market. PTM aware FPGA device models might come around Q3/Q4 this > year, with exercisers around 2017. > > >I'm trying to figure out whether there's any benefit to merging > >something before it is useful to anybody. > > > > True it won't be useful to anybody until such a device is available. > What is the general policy for future hardware standards? I don't know if there is a real consensus about that. In this case, the feature is relatively simple (at least compared to, say ASPM), and it's defined by a spec that's already been published, so I don't think there's really much reason to wait. I think the most expedient thing is to get it merged now so it'll be easier to test and deploy it. Bjorn -- 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
