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 >
