On Wed, 22 Jan 2025 at 11:53, Simon Maurer <mail@maurer.systems> wrote: > > The last patch would be the first step for RemoteProc over PCIe. I use a > Xilinx Zynq 7000 PCIe card as my remote CPU and a x86 PC as the the > host. Both vrings and RPMSG-buffer are in the remote (PCIe-Card) SRAM. > So the RPMSG-buffer isn't actually DMA memory, but the SRAM on the Zynq > is mapped in a PCIe-bar. I'm working now on a patch, that transfers the > ownership of the RPMSG-buffer form virtio_rpmsg_bus to > remoteproc_virtio. So instead of virtio_rpmsg_bus calling > dma_alloc_coherent for buffer allocation, it would call > virtio_get_shm_region to get TX/RX buffers and on rpmsg_remove it would > call virtio_release_shm_regions (new in virtio_config_ops), analogue to > find_vqs/del_vqs. > Thoughts? > Hi Simon, I don't know anything about the Zynq 7000 but I assume it needs to be explicitly told to act as an endpoint rather than a PCI bus master. I can't say much about the above without looking at real code so I will wait for your patches before spending more time on the design you are putting forward. As for your patch adding a new operation to the rproc_ops structure, please include in the submission for the work you presented above. It can't be merged without an actual customer. Thanks, Mathieu
