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Date: Thu, 2 Jul 2020 11:31:23 -0600
From: Mathieu Poirier <mathieu.poirier@...aro.org>
To: "Michael S. Tsirkin" <mst@...hat.com>
Cc: Kishon Vijay Abraham I <kishon@...com>,
Ohad Ben-Cohen <ohad@...ery.com>,
Bjorn Andersson <bjorn.andersson@...aro.org>,
Jon Mason <jdmason@...zu.us>,
Dave Jiang <dave.jiang@...el.com>,
Allen Hubbe <allenbh@...il.com>,
Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
Bjorn Helgaas <bhelgaas@...gle.com>,
Jason Wang <jasowang@...hat.com>,
Paolo Bonzini <pbonzini@...hat.com>,
Stefan Hajnoczi <stefanha@...hat.com>,
Stefano Garzarella <sgarzare@...hat.com>,
"open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
linux-remoteproc <linux-remoteproc@...r.kernel.org>,
linux-ntb@...glegroups.com, linux-pci@...r.kernel.org,
kvm@...r.kernel.org, virtualization@...ts.linux-foundation.org,
netdev@...r.kernel.org
Subject: Re: [RFC PATCH 00/22] Enhance VHOST to enable SoC-to-SoC communication
On Thu, 2 Jul 2020 at 03:51, Michael S. Tsirkin <mst@...hat.com> wrote:
>
> 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@ti.com
>
>
> I find this very interesting. A huge patchset so will take a bit
> to review, but I certainly plan to do that. Thanks!
Same here - it will take time. This patchset is sizable and sits
behind a few others that are equally big.
>
> >
> > 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
> >
>
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