linux-kernel - Re: [PATCH v4 00/10] vfio/fsl-mc: VFIO support for FSL-MC device

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Message-ID: <ae46be70-82d3-6137-6169-beb4bf8ae707@redhat.com>
Date:   Thu, 3 Sep 2020 15:40:01 +0200
From:   Auger Eric <eric.auger@...hat.com>
To:     Diana Craciun <diana.craciun@....nxp.com>,
        alex.williamson@...hat.com, kvm@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, bharatb.linux@...il.com,
        laurentiu.tudor@....com
Subject: Re: [PATCH v4 00/10] vfio/fsl-mc: VFIO support for FSL-MC device

Hi Diana,

On 8/26/20 11:33 AM, Diana Craciun wrote:
> DPAA2 (Data Path Acceleration Architecture) consists in
> mechanisms for processing Ethernet packets, queue management,
> accelerators, etc.
> 
> The Management Complex (mc) is a hardware entity that manages the DPAA2
> hardware resources. It provides an object-based abstraction for software
> drivers to use the DPAA2 hardware. The MC mediates operations such as
> create, discover, destroy of DPAA2 objects.
> The MC provides memory-mapped I/O command interfaces (MC portals) which
> DPAA2 software drivers use to operate on DPAA2 objects.
> 
> A DPRC is a container object that holds other types of DPAA2 objects.
> Each object in the DPRC is a Linux device and bound to a driver.
> The MC-bus driver is a platform driver (different from PCI or platform
> bus). The DPRC driver does runtime management of a bus instance. It
> performs the initial scan of the DPRC and handles changes in the DPRC
> configuration (adding/removing objects).
> 
> All objects inside a container share the same hardware isolation
> context, meaning that only an entire DPRC can be assigned to
> a virtual machine.
> When a container is assigned to a virtual machine, all the objects
> within that container are assigned to that virtual machine.
> The DPRC container assigned to the virtual machine is not allowed
> to change contents (add/remove objects) by the guest. The restriction
> is set by the host and enforced by the mc hardware.
> 
> The DPAA2 objects can be directly assigned to the guest. However
> the MC portals (the memory mapped command interface to the MC) need
> to be emulated because there are commands that configure the
> interrupts and the isolation IDs which are virtual in the guest.
> 
> Example:
> echo vfio-fsl-mc > /sys/bus/fsl-mc/devices/dprc.2/driver_override
> echo dprc.2 > /sys/bus/fsl-mc/drivers/vfio-fsl-mc/bind
> 
> The dprc.2 is bound to the VFIO driver and all the objects within
> dprc.2 are going to be bound to the VFIO driver.
> 
> More details about the DPAA2 objects can be found here:
> Documentation/networking/device_drivers/freescale/dpaa2/overview.rst
> 
> The patches are dependent on some changes in the mc-bus (bus/fsl-mc)
> driver. The changes were needed in order to re-use code and to export
> some more functions that are needed by the VFIO driver.
> Currenlty the mc-bus patches are under review:
> https://www.spinics.net/lists/kernel/msg3639226.html
Could you share a branch with both series? This would help the review.

Thanks

Eric
> 
> v3 --> v4
> - use bus provided functions to tear down the DPRC
> - added reset support
> 
> v2 --> v3
> - There is no need to align region size to page size
> - read/write implemented for all DPAA2 objects
> - review fixes
> 
> v1 --> v2
> - Fixed the container reset, a new flag added to the firmware command
> - Implement a bus notifier for setting driver_override
> 
> 
> Bharat Bhushan (1):
>   vfio/fsl-mc: Add VFIO framework skeleton for fsl-mc devices
> 
> Diana Craciun (9):
>   vfio/fsl-mc: Scan DPRC objects on vfio-fsl-mc driver bind
>   vfio/fsl-mc: Implement VFIO_DEVICE_GET_INFO ioctl
>   vfio/fsl-mc: Implement VFIO_DEVICE_GET_REGION_INFO ioctl call
>   vfio/fsl-mc: Allow userspace to MMAP fsl-mc device MMIO regions
>   vfio/fsl-mc: Added lock support in preparation for interrupt handling
>   vfio/fsl-mc: Add irq infrastructure for fsl-mc devices
>   vfio/fsl-mc: trigger an interrupt via eventfd
>   vfio/fsl-mc: Add read/write support for fsl-mc devices
>   vfio/fsl-mc: Add support for device reset
> 
>  MAINTAINERS                               |   6 +
>  drivers/vfio/Kconfig                      |   1 +
>  drivers/vfio/Makefile                     |   1 +
>  drivers/vfio/fsl-mc/Kconfig               |   9 +
>  drivers/vfio/fsl-mc/Makefile              |   4 +
>  drivers/vfio/fsl-mc/vfio_fsl_mc.c         | 684 ++++++++++++++++++++++
>  drivers/vfio/fsl-mc/vfio_fsl_mc_intr.c    | 221 +++++++
>  drivers/vfio/fsl-mc/vfio_fsl_mc_private.h |  56 ++
>  include/uapi/linux/vfio.h                 |   1 +
>  9 files changed, 983 insertions(+)
>  create mode 100644 drivers/vfio/fsl-mc/Kconfig
>  create mode 100644 drivers/vfio/fsl-mc/Makefile
>  create mode 100644 drivers/vfio/fsl-mc/vfio_fsl_mc.c
>  create mode 100644 drivers/vfio/fsl-mc/vfio_fsl_mc_intr.c
>  create mode 100644 drivers/vfio/fsl-mc/vfio_fsl_mc_private.h
>