On Sunday 11 January 2009, Benjamin Herrenschmidt wrote: > On Thu, 2009-01-08 at 13:51 -0800, Ira Snyder wrote: > > The guests (PowerPC computers running Linux) are PCI cards in the host > > system (an Intel Pentium3-M system). The guest computers can access all > > of the host's memory. The guests provide a 1MB (movable) window into > > their memory. > > > > The PowerPC computers also have a DMA controller, which I've used to get > > better throughput from my driver. I have a way to create interrupts to > > both the host and guest systems. > > That looks -very- similar to the PCI driver for CAB and Cell triblades > that was, I think, submitted a while ago. Arnd what's the status with > that driver ?
Complicated ;-) There were two device drivers for the Axon PCIe endpoint (from Mercury and IBM), but both were abandoned due to being too complex to get into a mergeable stage, and all the original developers are doing other work now. I'm maintaining the IBM driver now, but have no plans to submit that for inclusion. I hope that I can soon find more time to work on a replacement driver that will provide the right abstraction through virtio for kernel drivers, plus a ibverbs user interface for direct application programming. It should also have pluggable backends to support not only Cell hardware but anything with a similar hardware implementation. I did make a presentation about this at the Plumbers Conference, see http://userweb.kernel.org/%7Earnd/papers/plumbers08/plumbers-slides.pdf. Since then, I have come to a much clearer idea of what needs to be done, but not more actual code. Arnd <>< _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev