This is a patchset for a new vendor specific VFIO driver (pds_vfio) for use with the AMD/Pensando Distributed Services Card (DSC). This driver makes use of the newly introduced pds_core driver, which the latest version can be referenced at: https://lore.kernel.org/netdev/20230330234628.14627-1-shannon.nelson@xxxxxxx/ This driver will use the pds_core device's adminq as the VFIO control path to the DSC. In order to make adminq calls, the VFIO instance makes use of functions exported by the pds_core driver. In order to receive events from pds_core, the pds_vfio driver registers to a private notifier. This is needed for various events that come from the device. An ASCII diagram of a VFIO instance looks something like this and can be used with the VFIO subsystem to provide the VF device VFIO and live migration support. .------. .-----------------------. | QEMU |--| VM .-------------. | '......' | | Eth VF | | | | .-------------. | | | | SR-IOV VF | | | | '-------------' | | '------------||---------' .--------------. || |/dev/<vfio_fd>| || '--------------' || Host Userspace | || =================================================== || Host Kernel | || .--------. || |vfio-pci| || '--------' || .------------------. || || | | exported API |<----+ || || | '--------------| | || || | | .-------------. || | pds_core |--->| pds_vfio | || '------------------' | '-------------' || || | || || 09:00.0 notifier 09:00.1 || == PCI ===============================================||===== || || || .----------. .----------. || ,-----| PF |----------| VF |-------------------, | '----------' '----------' | VF | | DSC | data/control | | | path | ----------------------------------------------------------- The pds_vfio driver is targeted to reside in drivers/vfio/pci/pds. It makes use of and introduces new files in the common include/linux/pds include directory. Changes: v8: - provide default iommufd callbacks for bind_iommufd, unbind_iommufd, and attach_ioas for the VFIO device as suggested by Shameerali Kolothum Thodi. v7: https://lore.kernel.org/netdev/20230331003612.17569-1-brett.creeley@xxxxxxx/ - Disable and clean up dirty page tracking when the VFIO device is closed - Various improvements suggested by Simon Horman: - Fix RCT in vfio_combine_iova_ranges() - Simplify function exit paths by removing unnecessary goto labels - Cleanup pds_vifo_print_guest_region_info() by adding a goto label for freeing memory, which allowed for reduced indentation on a for loop - Where possible use C99 style for loops v6: https://lore.kernel.org/netdev/20230327200553.13951-1-brett.creeley@xxxxxxx/ - As suggested by Alex Williamson, use pci_domain_nr() macro to make sure the pds_vfio client's devname is unique - Remove unnecessary forward declaration and include - Fix copyright comment to use correct company name - Remove "." from struct documentation for consistency v5: https://lore.kernel.org/netdev/20230322203442.56169-1-brett.creeley@xxxxxxx/ - Fix SPDX comments in .h files - Remove adminqcq argument from pdsc_post_adminq() uses - Unregister client on vfio_pci_core_register_device() failure - Other minor checkpatch issues v4: https://lore.kernel.org/netdev/20230308052450.13421-1-brett.creeley@xxxxxxx/ - Update cover letter ASCII diagram to reflect new driver architecture - Remove auxiliary driver implementation - Use pds_core's exported functions to communicate with the device - Implement and register notifier for events from the device/pds_core - Use module_pci_driver() macro since auxiliary driver configuration is no longer needed in __init/__exit v3: https://lore.kernel.org/netdev/20230219083908.40013-1-brett.creeley@xxxxxxx/ - Update copyright year to 2023 and use "Advanced Micro Devices, Inc." for the company name - Clarify the fact that AMD/Pensando's VFIO solution is device type agnostic, which aligns with other current VFIO solutions - Add line in drivers/vfio/pci/Makefile to build pds_vfio - Move documentation to amd sub-directory - Remove some dead code due to the pds_core implementation of listening to BIND/UNBIND events - Move a dev_dbg() to a previous patch in the series - Add implementation for vfio_migration_ops.migration_get_data_size to return the maximum possible device state size RFC to v2: https://lore.kernel.org/all/20221214232136.64220-1-brett.creeley@xxxxxxx/ - Implement state transitions for VFIO_MIGRATION_P2P flag - Improve auxiliary driver probe by returning EPROBE_DEFER when the PCI driver is not set up correctly - Add pointer to docs in Documentation/networking/device_drivers/ethernet/index.rst RFC: https://lore.kernel.org/all/20221207010705.35128-1-brett.creeley@xxxxxxx/ Brett Creeley (7): vfio: Commonize combine_ranges for use in other VFIO drivers vfio/pds: Initial support for pds_vfio VFIO driver vfio/pds: register with the pds_core PF vfio/pds: Add VFIO live migration support vfio/pds: Add support for dirty page tracking vfio/pds: Add support for firmware recovery vfio/pds: Add Kconfig and documentation .../device_drivers/ethernet/amd/pds_vfio.rst | 79 +++ .../device_drivers/ethernet/index.rst | 1 + MAINTAINERS | 7 + drivers/vfio/pci/Kconfig | 2 + drivers/vfio/pci/Makefile | 2 + drivers/vfio/pci/mlx5/cmd.c | 48 +- drivers/vfio/pci/pds/Kconfig | 20 + drivers/vfio/pci/pds/Makefile | 11 + drivers/vfio/pci/pds/cmds.c | 530 +++++++++++++++++ drivers/vfio/pci/pds/cmds.h | 25 + drivers/vfio/pci/pds/dirty.c | 536 ++++++++++++++++++ drivers/vfio/pci/pds/dirty.h | 45 ++ drivers/vfio/pci/pds/lm.c | 478 ++++++++++++++++ drivers/vfio/pci/pds/lm.h | 52 ++ drivers/vfio/pci/pds/pci_drv.c | 212 +++++++ drivers/vfio/pci/pds/pci_drv.h | 9 + drivers/vfio/pci/pds/vfio_dev.c | 239 ++++++++ drivers/vfio/pci/pds/vfio_dev.h | 40 ++ drivers/vfio/vfio_main.c | 47 ++ include/linux/pds/pds_lm.h | 389 +++++++++++++ include/linux/vfio.h | 3 + 21 files changed, 2728 insertions(+), 47 deletions(-) create mode 100644 Documentation/networking/device_drivers/ethernet/amd/pds_vfio.rst create mode 100644 drivers/vfio/pci/pds/Kconfig create mode 100644 drivers/vfio/pci/pds/Makefile create mode 100644 drivers/vfio/pci/pds/cmds.c create mode 100644 drivers/vfio/pci/pds/cmds.h create mode 100644 drivers/vfio/pci/pds/dirty.c create mode 100644 drivers/vfio/pci/pds/dirty.h create mode 100644 drivers/vfio/pci/pds/lm.c create mode 100644 drivers/vfio/pci/pds/lm.h create mode 100644 drivers/vfio/pci/pds/pci_drv.c create mode 100644 drivers/vfio/pci/pds/pci_drv.h create mode 100644 drivers/vfio/pci/pds/vfio_dev.c create mode 100644 drivers/vfio/pci/pds/vfio_dev.h create mode 100644 include/linux/pds/pds_lm.h -- 2.17.1
