Messages in this thread | | | Date | Thu, 29 Oct 2020 11:07:27 +0100 | From | Vincent Whitchurch <> | Subject | Re: [PATCH V3 2/4] misc: vop: do not allocate and reassign the used ring |
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On Wed, Oct 28, 2020 at 04:50:36PM +0100, Arnd Bergmann wrote: > I think we should try to do something on top of the PCIe endpoint subsystem > to make it work across arbitrary combinations of host and device > implementations, > and provide a superset of what the MIC driver, (out-of-tree) Bluefield endpoint > driver, and the NTB subsystem as well as a couple of others used to do, > each of them tunneling block/network/serial/... over a PCIe link of some > sort, usually with virtio.
VOP is not PCIe-specific (as demonstrated by the vop-loopback patches I posted a while ago [1]), and it would be a shame for a replacement to be tied to the PCIe endpoint subsystem. There are many SOCs out there which have multiple Linux-capable processors without cache-coherency between them. VOP is (or should I say was since I guess it's being deleted) the closest we have in mainline to easily get generic virtio (and not just rpmsg) running between these kind of Linux instances. If a new replacement framework were to be PCIe-exclusive then we'd have to invent one more framework for non-PCIe links to do pretty much the same thing.
[1] https://lore.kernel.org/lkml/20190403104746.16063-1-vincent.whitchurch@axis.com/
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