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Asahi Lina
80df573af9
The DRM shmem helper includes common code useful for drivers which allocate GEM objects as anonymous shmem. Add a Rust abstraction for this. Drivers can choose the raw GEM implementation or the shmem layer, depending on their needs. Signed-off-by: Asahi Lina <[email protected]> Signed-off-by: Daniel Almeida <[email protected]> Reviewed-by: Daniel Almeida <[email protected]> Signed-off-by: Lyude Paul <[email protected]> Reviewed-by: Janne Grunau <[email protected]> Tested-by: Deborah Brouwer <[email protected]> Link: https://patch.msgid.link/[email protected] [ * DRM_GEM_SHMEM_HELPER is a tristate; when a module driver selects it, it becomes =m. The Rust kernel crate and its C helpers are always built into vmlinux and can't reference symbols from a module, causing link errors. Thus, add RUST_DRM_GEM_SHMEM_HELPER bool Kconfig that selects DRM_GEM_SHMEM_HELPER, forcing it built-in when Rust drivers need it; use cfg(CONFIG_RUST_DRM_GEM_SHMEM_HELPER) for the shmem module. * Add cfg_attr(not(CONFIG_RUST_DRM_GEM_SHMEM_HELPER), expect(unused)) on pub(crate) use impl_aref_for_gem_obj and BaseObjectPrivate, so that unused warnings are suppressed when shmem is not enabled. * Enable const_refs_to_static (stabilized in 1.83) to prevent build errors with older compilers. * Use &raw const for bindings::drm_gem_shmem_vm_ops and add #[allow(unused_unsafe, reason = "Safe since Rust 1.82.0")]. * Fix incorrect C Header path and minor spelling and formatting issues. * Drop shmem::Object::sg_table() as the current implementation is unsound. - Danilo ] Signed-off-by: Danilo Krummrich <[email protected]>