Re: [RFC PATCH 00/22] Enhance VHOST to enable SoC-to-SoC communication

Kishon Vijay Abraham I
2020-07-02T10:26:01Z

Hi Michael,

On 7/2/2020 3:21 PM, Michael S. Tsirkin 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!

Great to hear! Thanks in advance for reviewing!

Regards
Kishon

>
>>
>> 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
>>
>