vfio_mdev has a number of different objects: mdev_parent, mdev_type and mdev_device.
Unfortunately the types of these have been erased in various places throughout the API, and this makes it very hard to understand this code or maintain it by the time it reaches all of the drivers.
This series puts in all the types and aligns some of the design with the driver core standard for a driver core bus driver:
- Replace 'struct device *' with 'struct mdev_device * - Replace 'struct device *' with 'struct mdev_type *' and mtype_get_parent_dev() - Replace 'struct kobject *' with 'struct mdev_type *'
Now that types are clear it is easy to spot a few places that have duplicated information.
More significantly we can now understand how to directly fix the obfuscated 'kobj->name' matching by realizing the the kobj is a mdev_type, which is linked to the supported_types_list provided by the driver, and thus the core code can directly return the array indexes all the drivers actually want.
v2: - Use a mdev_type local in mdev_create_sysfs_files - Rename the goto unwind labels in mdev_device_free() - Reorder patches, annotate reviewed-by's thanks all v1: https://lore.kernel.org/r/0-v1-7dedf20b2b75+4f785-vfio2_jgg@nvidia.com
Jason Gunthorpe (18): vfio/mdev: Fix missing static's on MDEV_TYPE_ATTR's vfio/mdev: Do not allow a mdev_type to have a NULL parent pointer vfio/mdev: Add missing typesafety around mdev_device vfio/mdev: Simplify driver registration vfio/mdev: Use struct mdev_type in struct mdev_device vfio/mdev: Expose mdev_get/put_parent to mdev_private.h vfio/mdev: Add missing reference counting to mdev_type vfio/mdev: Reorganize mdev_device_create() vfio/mdev: Add missing error handling to dev_set_name() vfio/mdev: Remove duplicate storage of parent in mdev_device vfio/mdev: Add mdev/mtype_get_type_group_id() vfio/mtty: Use mdev_get_type_group_id() vfio/mdpy: Use mdev_get_type_group_id() vfio/mbochs: Use mdev_get_type_group_id() vfio/gvt: Make DRM_I915_GVT depend on VFIO_MDEV vfio/gvt: Use mdev_get_type_group_id() vfio/mdev: Remove kobj from mdev_parent_ops->create() vfio/mdev: Correct the function signatures for the mdev_type_attributes
.../driver-api/vfio-mediated-device.rst | 9 +- drivers/gpu/drm/i915/Kconfig | 1 + drivers/gpu/drm/i915/gvt/gvt.c | 41 ++--- drivers/gpu/drm/i915/gvt/gvt.h | 4 +- drivers/gpu/drm/i915/gvt/kvmgt.c | 7 +- drivers/s390/cio/vfio_ccw_ops.c | 17 +- drivers/s390/crypto/vfio_ap_ops.c | 14 +- drivers/vfio/mdev/mdev_core.c | 174 +++++++----------- drivers/vfio/mdev/mdev_driver.c | 19 +- drivers/vfio/mdev/mdev_private.h | 40 ++-- drivers/vfio/mdev/mdev_sysfs.c | 59 +++--- drivers/vfio/mdev/vfio_mdev.c | 29 +-- drivers/vfio/vfio_iommu_type1.c | 25 +-- include/linux/mdev.h | 80 +++++--- samples/vfio-mdev/mbochs.c | 55 +++--- samples/vfio-mdev/mdpy.c | 56 +++--- samples/vfio-mdev/mtty.c | 66 ++----- 17 files changed, 313 insertions(+), 383 deletions(-)