DRM file private data is currently 'static, preventing drivers from borrowing registration-scoped resources in their per-file state. This series makes Driver::File lifetime-parameterized through ForLt, so file data can borrow from RegistrationData.
File data is guaranteed to be dropped before registration data, either when the file is closed normally or when the device is unregistered, whichever comes first. To enforce this during unbind, Registration::drop() revokes all open file data and waits for in-flight closes before dropping registration data. fops.open is wrapped in a RegistrationGuard (drm_dev_enter/exit) so that after drm_dev_unplug() all successfully opened files are accounted for. GEM open/close callbacks are similarly gated to prevent access to stale file data after unbind. The series is based on drm-rust-next with [1] applied and [2] merged, a branch with the patches is available in [3]. [1] https://lore.kernel.org/all/[email protected]/ [2] https://git.kernel.org/pub/scm/linux/kernel/git/driver-core/driver-core.git/tag/?h=dd-lifetimes-7.3-rc1 [3] https://git.kernel.org/pub/scm/linux/kernel/git/dakr/linux.git/log/?h=drm/file Danilo Krummrich (7): rust: drm: rename Ioctl device context to Userspace rust: drm: gem: gate open/close callbacks with RegistrationGuard rust: drm: move file_operations from gem to device rust: fs: add iminor() helper rust: drm: wrap fops open with RegistrationGuard rust: drm: make Driver::File lifetime-parameterized rust: drm: return impl PinInit from DriverFile::open() drivers/gpu/drm/nova/driver.rs | 5 +- drivers/gpu/drm/nova/file.rs | 13 ++- drivers/gpu/drm/nova/gem.rs | 8 +- drivers/gpu/drm/tyr/driver.rs | 5 +- drivers/gpu/drm/tyr/file.rs | 13 +-- rust/helpers/fs.c | 5 ++ rust/kernel/drm/device.rs | 139 ++++++++++++++++++++++++++---- rust/kernel/drm/driver.rs | 69 ++++++++++++++- rust/kernel/drm/file.rs | 151 ++++++++++++++++++++++----------- rust/kernel/drm/gem/mod.rs | 48 +++++------ rust/kernel/drm/gem/shmem.rs | 14 +-- rust/kernel/drm/ioctl.rs | 14 +-- rust/kernel/drm/mod.rs | 2 +- 13 files changed, 356 insertions(+), 130 deletions(-) -- 2.55.0
