On Thu, Jul 02, 2020 at 01:51:21PM +0530, Kishon Vijay Abraham I wrote: > This series enhances Linux Vhost support to enable SoC-to-SoC > communication over MMIO. This series enables rpmsg communication between > two SoCs using both PCIe RC<->EP and HOST1-NTB-HOST2 > > 1) Modify vhost to use standard Linux driver model > 2) Add support in vring to access virtqueue over MMIO > 3) Add vhost client driver for rpmsg > 4) Add PCIe RC driver (uses virtio) and PCIe EP driver (uses vhost) for > rpmsg communication between two SoCs connected to each other > 5) Add NTB Virtio driver and NTB Vhost driver for rpmsg communication > between two SoCs connected via NTB > 6) Add configfs to configure the components > > UseCase1 : > > VHOST RPMSG VIRTIO RPMSG > + + > | | > | | > | | > | | > +-----v------+ +------v-------+ > | Linux | | Linux | > | Endpoint | | Root Complex | > | <-----------------> | > | | | | > | SOC1 | | SOC2 | > +------------+ +--------------+ > > UseCase 2: > > VHOST RPMSG VIRTIO RPMSG > + + > | | > | | > | | > | | > +------v------+ +------v------+ > | | | | > | HOST1 | | HOST2 | > | | | | > +------^------+ +------^------+ > | | > | | > +---------------------------------------------------------------------+ > | +------v------+ +------v------+ | > | | | | | | > | | EP | | EP | | > | | CONTROLLER1 | | CONTROLLER2 | | > | | <-----------------------------------> | | > | | | | | | > | | | | | | > | | | SoC With Multiple EP Instances | | | > | | | (Configured using NTB Function) | | | > | +-------------+ +-------------+ | > +---------------------------------------------------------------------+ > > Software Layering: > > The high-level SW layering should look something like below. This series > adds support only for RPMSG VHOST, however something similar should be > done for net and scsi. With that any vhost device (PCI, NTB, Platform > device, user) can use any of the vhost client driver. > > > +----------------+ +-----------+ +------------+ +----------+ > | RPMSG VHOST | | NET VHOST | | SCSI VHOST | | X | > +-------^--------+ +-----^-----+ +-----^------+ +----^-----+ > | | | | > | | | | > | | | | > +-----------v-----------------v--------------v--------------v----------+ > | VHOST CORE | > +--------^---------------^--------------------^------------------^-----+ > | | | | > | | | | > | | | | > +--------v-------+ +----v------+ +----------v----------+ +----v-----+ > | PCI EPF VHOST | | NTB VHOST | |PLATFORM DEVICE VHOST| | X | > +----------------+ +-----------+ +---------------------+ +----------+ > > This was initially proposed here [1] > > [1] -> https://lore.kernel.org/r/2cf00ec4-1ed6-f66e-6897-006d1a5b6390@xxxxxx I find this very interesting. A huge patchset so will take a bit to review, but I certainly plan to do that. Thanks! > > Kishon Vijay Abraham I (22): > vhost: Make _feature_ bits a property of vhost device > vhost: Introduce standard Linux driver model in VHOST > vhost: Add ops for the VHOST driver to configure VHOST device > vringh: Add helpers to access vring in MMIO > vhost: Add MMIO helpers for operations on vhost virtqueue > vhost: Introduce configfs entry for configuring VHOST > virtio_pci: Use request_threaded_irq() instead of request_irq() > rpmsg: virtio_rpmsg_bus: Disable receive virtqueue callback when > reading messages > rpmsg: Introduce configfs entry for configuring rpmsg > rpmsg: virtio_rpmsg_bus: Add Address Service Notification support > rpmsg: virtio_rpmsg_bus: Move generic rpmsg structure to > rpmsg_internal.h > virtio: Add ops to allocate and free buffer > rpmsg: virtio_rpmsg_bus: Use virtio_alloc_buffer() and > virtio_free_buffer() > rpmsg: Add VHOST based remote processor messaging bus > samples/rpmsg: Setup delayed work to send message > samples/rpmsg: Wait for address to be bound to rpdev for sending > message > rpmsg.txt: Add Documentation to configure rpmsg using configfs > virtio_pci: Add VIRTIO driver for VHOST on Configurable PCIe Endpoint > device > PCI: endpoint: Add EP function driver to provide VHOST interface > NTB: Add a new NTB client driver to implement VIRTIO functionality > NTB: Add a new NTB client driver to implement VHOST functionality > NTB: Describe the ntb_virtio and ntb_vhost client in the documentation > > Documentation/driver-api/ntb.rst | 11 + > Documentation/rpmsg.txt | 56 + > drivers/ntb/Kconfig | 18 + > drivers/ntb/Makefile | 2 + > drivers/ntb/ntb_vhost.c | 776 +++++++++++ > drivers/ntb/ntb_virtio.c | 853 ++++++++++++ > drivers/ntb/ntb_virtio.h | 56 + > drivers/pci/endpoint/functions/Kconfig | 11 + > drivers/pci/endpoint/functions/Makefile | 1 + > .../pci/endpoint/functions/pci-epf-vhost.c | 1144 ++++++++++++++++ > drivers/rpmsg/Kconfig | 10 + > drivers/rpmsg/Makefile | 3 +- > drivers/rpmsg/rpmsg_cfs.c | 394 ++++++ > drivers/rpmsg/rpmsg_core.c | 7 + > drivers/rpmsg/rpmsg_internal.h | 136 ++ > drivers/rpmsg/vhost_rpmsg_bus.c | 1151 +++++++++++++++++ > drivers/rpmsg/virtio_rpmsg_bus.c | 184 ++- > drivers/vhost/Kconfig | 1 + > drivers/vhost/Makefile | 2 +- > drivers/vhost/net.c | 10 +- > drivers/vhost/scsi.c | 24 +- > drivers/vhost/test.c | 17 +- > drivers/vhost/vdpa.c | 2 +- > drivers/vhost/vhost.c | 730 ++++++++++- > drivers/vhost/vhost_cfs.c | 341 +++++ > drivers/vhost/vringh.c | 332 +++++ > drivers/vhost/vsock.c | 20 +- > drivers/virtio/Kconfig | 9 + > drivers/virtio/Makefile | 1 + > drivers/virtio/virtio_pci_common.c | 25 +- > drivers/virtio/virtio_pci_epf.c | 670 ++++++++++ > include/linux/mod_devicetable.h | 6 + > include/linux/rpmsg.h | 6 + > {drivers/vhost => include/linux}/vhost.h | 132 +- > include/linux/virtio.h | 3 + > include/linux/virtio_config.h | 42 + > include/linux/vringh.h | 46 + > samples/rpmsg/rpmsg_client_sample.c | 32 +- > tools/virtio/virtio_test.c | 2 +- > 39 files changed, 7083 insertions(+), 183 deletions(-) > create mode 100644 drivers/ntb/ntb_vhost.c > create mode 100644 drivers/ntb/ntb_virtio.c > create mode 100644 drivers/ntb/ntb_virtio.h > create mode 100644 drivers/pci/endpoint/functions/pci-epf-vhost.c > create mode 100644 drivers/rpmsg/rpmsg_cfs.c > create mode 100644 drivers/rpmsg/vhost_rpmsg_bus.c > create mode 100644 drivers/vhost/vhost_cfs.c > create mode 100644 drivers/virtio/virtio_pci_epf.c > rename {drivers/vhost => include/linux}/vhost.h (66%) > > -- > 2.17.1 >
