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Date: Tue, 7 Mar 2023 21:24:43 -0800
From: Brett Creeley <brett.creeley@....com>
To: <kvm@...r.kernel.org>, <netdev@...r.kernel.org>,
<alex.williamson@...hat.com>, <jgg@...dia.com>,
<yishaih@...dia.com>, <shameerali.kolothum.thodi@...wei.com>,
<kevin.tian@...el.com>
CC: <brett.creeley@....com>, <shannon.nelson@....com>,
<drivers@...sando.io>
Subject: [RFC PATCH v4 0/7] pds vfio driver
This is a draft patchset for a new vendor specific VFIO driver
(pds_vfio) for use with the AMD/Pensando Distributed Services Card
(DSC). This driver is a client of the newly introduced pds_core
driver, which the latest version can be referenced at:
https://lore.kernel.org/netdev/20230308051310.12544-1-shannon.nelson@amd.com/
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:
v4:
- 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@amd.com/
- 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@amd.com/
- 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@amd.com/
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 | 527 +++++++++++++++++
drivers/vfio/pci/pds/cmds.h | 27 +
drivers/vfio/pci/pds/dirty.c | 540 ++++++++++++++++++
drivers/vfio/pci/pds/dirty.h | 45 ++
drivers/vfio/pci/pds/lm.c | 486 ++++++++++++++++
drivers/vfio/pci/pds/lm.h | 52 ++
drivers/vfio/pci/pds/pci_drv.c | 210 +++++++
drivers/vfio/pci/pds/pci_drv.h | 9 +
drivers/vfio/pci/pds/vfio_dev.c | 235 ++++++++
drivers/vfio/pci/pds/vfio_dev.h | 40 ++
drivers/vfio/vfio_main.c | 48 ++
include/linux/pds/pds_lm.h | 391 +++++++++++++
include/linux/vfio.h | 3 +
21 files changed, 2736 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
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