[PATCH v2 0/1] vfio/pci: Give drivers control of PCI driver_data

[Simon Song <xinmengs@nvidia.com>]

Hi All,

During the discussion of the proposed Rust NVIDIA vGPU VFIO variant
driver [1], Danilo mentioned that vfio-pci-core requires pci driver_data
to point to vfio_pci_core_device, this conflicts with driver data
managed by proposed nvidia vfio variant driver.

This patch moves the responsibility for interpreting driver_data to the
pci driver, the vfio core functions (PM, AER, VGA) takes an explicit
vfio_pci_core_device pointer and no longer depend on pci driver_data

VFIO_PCI_CORE_DEFINE_CALLBACK marcos generate the wrappers for existing
vfio variant drivers, each driver also assigns its own PM ops table to
replace the operation done by vfio-pci-core during registration.

For VGA, drivers provide its decode callback to
vfio_pci_core_register_device, VGA setup/teardown remains inside vfio
core registration/unregistration, this preserves vga initialize
sequence and also remove the core dependacy on driver data.


[1] https://lore.kernel.org/all/DLFD2ZDSK9YQ.3A4R66G8UJMD8@kernel.org/

Simon Song (1):
  vfio/pci: Remove the core dependency on driver data

 .../vfio/pci/hisilicon/hisi_acc_vfio_pci.c    | 27 ++++-----
 drivers/vfio/pci/ism/main.c                   | 19 +++---
 drivers/vfio/pci/mlx5/main.c                  | 13 ++--
 drivers/vfio/pci/nvgrace-gpu/main.c           | 19 +++---
 drivers/vfio/pci/pds/pci_drv.c                |  8 ++-
 drivers/vfio/pci/pds/vfio_dev.c               |  5 +-
 drivers/vfio/pci/qat/main.c                   | 12 ++--
 drivers/vfio/pci/vfio_pci.c                   | 33 +++++++++-
 drivers/vfio/pci/vfio_pci_core.c              | 60 +++++++------------
 drivers/vfio/pci/virtio/main.c                |  8 ++-
 drivers/vfio/pci/xe/main.c                    |  8 ++-
 include/linux/vfio_pci_core.h                 | 42 ++++++++++++-
 12 files changed, 160 insertions(+), 94 deletions(-)

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2.43.7