Hi, This patch series adds generic kernel allocator support for Rust, which so far is limited to `kmalloc` allocations. In order to abstain from (re-)adding unstable Rust features to the kernel, this patch series does not extend the `Allocator` trait from Rust's `alloc` crate, nor does it extend the `BoxExt` and `VecExt` extensions. Instead, this series introduces a kernel specific `Allocator` trait, which is implemented by the `Kmalloc`, `Vmalloc` and `KVmalloc` allocators, also implemented in the context of this series. As a consequence we need our own kernel `Box<T, A>` and `Vec<T, A>` types. Additionally, this series adds the following type aliases: ``` pub type KBox<T> = Box<T, Kmalloc>; pub type VBox<T> = Box<T, Vmalloc>; pub type KVBox<T> = Box<T, KVmalloc>; pub type KVec<T> = Vec<T, Kmalloc>; pub type VVec<T> = Vec<T, Vmalloc>; pub type KVVec<T> = Vec<T, KVmalloc>; ``` With that, we can start using the kernel `Box` and `Vec` types throughout the tree and remove the now obolete extensions `BoxExt` and `VecExt`. For a final cleanup, this series removes the last minor dependencies to Rust's `alloc` crate and removes it from the entire kernel build. The series ensures not to break the `rusttest` make target by implementing the `allocator_test` module providing a stub implementation for all kernel `Allocator`s. This patch series passes all KUnit tests, including the ones added by this series. Additionally, the tests were run with `kmemleak` and `KASAN` enabled, without any issues. This series is based on [1], which hit -mm/mm-stable, and is also available in [2]. [1] https://git.kernel.org/pub/scm/linux/kernel/git/dakr/linux.git/log/?h=mm/krealloc [2] https://git.kernel.org/pub/scm/linux/kernel/git/dakr/linux.git/log/?h=rust/mm Changes in v7: - rebase onto rust-next resolving recent conflicts (93dc3be19450447a3a7090bd1dfb9f3daac3e8d2) - documentation / safety comment changes suggested by Benno and Boqun - rename `ptr` to `current` in `IntoIter::next` (Alice) - remove unnecessary braces in `kvec!` (Benno) - add `debug_assert!` in `Vec::set_len` (Benno) - remove unused args in `impl_slice_eq!` (Benno) - simplify `if` statement in `Cmalloc::realloc` (Benno) Changes in v6: - rebase onto rust-dev - keep compiler annotations for {k,v,kv}realloc() - documentation changes suggested by Alice, Benno - remove `Box::into_pin` - fix typo in `Send` and `Sync` for `Box` and `Vec` - `kvec!` changes suggested by Alice - free `src` after copy in `Cmalloc` - handle `n == 0` in `Vec::extend_with` Changes in v5: - (safety) comment / documentation fixes suggested by Alice, Benno and Gary - remove `Unique<T>` and implement `Send` and `Sync` for `Box` and `Vec` - use `KMALLOC_MAX_SIZE` for `KVmalloc` test and add a `Kmalloc` test that expects to fail for `KMALLOC_MAX_SIZE` - create use constants `KREALLOC`, `VREALLOC` and `KVREALLOC` for `ReallocFuncs` - drop `Box::drop_contents` for now, will add it again, once I actually rebase on the original patch that introduces it - improve usage of `size_of_val` in `Box` - move `InPlaceInit` and `ForeignOwnable` impls into kbox.rs - fix missing `Box` conversions in rnull.rs - reworked `Cmalloc` to keep track of the size of memory allocations itself - remove `GlobalAlloc` together with the `alloc` crate to avoid a linker error - remove `alloc` from scripts/generate_rust_analyzer.py Changes in v4: - (safety) comment fixes suggested by Alice and Boqun - remove `Box::from_raw_alloc` and `Box::into_raw_alloc`, we don't need them - in `Box::drop` call `size_of_val` before `drop_in_place` - implement ForeignOwnable for Pin<Box<T>> as suggested by Alice - in `Vec::extend_with`, iterate over `n` instead of `spare.len()` - for `Vmalloc` and `KVmalloc` fail allocation for alignments larger than PAGE_SIZE for now (will add support for larger alignments in a separate series) - implement `Cmalloc` in `allocator_test` and type alias all kernel allocator types to it, such that we can use the kernel's `Box` and `Vec` types in userspace tests (rusttest) - this makes patch "rust: str: test: replace `alloc::format`" rather trivial Changes in v3: - Box: - minor documentation fixes - removed unnecessary imports in doc tests - dropeed `self` argument from some remaining `Box` methods - implement `InPlaceInit` for Box<T, A> rather than specifically for `KBox<T>` - Vec: - minor documentation fixes - removed useless `Vec::allocator` method - in `Vec::extend_with` use `Vec::spare_capacity_mut` instead of raw pointer operations - added a few missing safety comments - pass GFP flags to `Vec::collect` - fixed a rustdoc warning in alloc.rs - fixed the allocator_test module to implement the `Allocator` trait correctly - rebased to rust-next Changes in v2: - preserve `impl GlobalAlloc for Kmalloc` and remove it at the end (Benno) - remove `&self` parameter from all `Allocator` functions (Benno) - various documentation fixes for `Allocator` (Benno) - use `NonNull<u8>` for `Allocator::free` and `Option<NonNull<u8>>` for `Allocator::realloc` (Benno) - fix leak of `IntoIter` in `Vec::collect` (Boqun) - always realloc (try to shrink) in `Vec::collect`, it's up the the `Allocator` to provide a heuristic whether it makes sense to actually shrink - rename `KBox<T, A>` -> `Box<T, A>` and `KVec<T, A>` -> `Vec<T, A>` and provide type aliases `KBox<T>`, `VBox<T>`, `KVBox<T>`, etc. - This allows for much cleaner code and, in combination with removing `&self` parameters from `Allocator`s, gets us rid of the need for `Box::new` and `Box::new_alloc` and all other "_alloc" postfixed functions. - Before: `KBox::new_alloc(foo, Vmalloc)?` - After: `VBox::new(foo)?`, which resolves to `Box::<Foo, Vmalloc>::new(foo)?; Danilo Krummrich (26): rust: alloc: add `Allocator` trait rust: alloc: separate `aligned_size` from `krealloc_aligned` rust: alloc: rename `KernelAllocator` to `Kmalloc` rust: alloc: implement `Allocator` for `Kmalloc` rust: alloc: add module `allocator_test` rust: alloc: implement `Vmalloc` allocator rust: alloc: implement `KVmalloc` allocator rust: alloc: add __GFP_NOWARN to `Flags` rust: alloc: implement kernel `Box` rust: treewide: switch to our kernel `Box` type rust: alloc: remove extension of std's `Box` rust: alloc: add `Box` to prelude rust: alloc: implement kernel `Vec` type rust: alloc: implement `IntoIterator` for `Vec` rust: alloc: implement `collect` for `IntoIter` rust: treewide: switch to the kernel `Vec` type rust: alloc: remove `VecExt` extension rust: alloc: add `Vec` to prelude rust: error: use `core::alloc::LayoutError` rust: error: check for config `test` in `Error::name` rust: alloc: implement `contains` for `Flags` rust: alloc: implement `Cmalloc` in module allocator_test rust: str: test: replace `alloc::format` rust: alloc: update module comment of alloc.rs kbuild: rust: remove the `alloc` crate and `GlobalAlloc` MAINTAINERS: add entry for the Rust `alloc` module MAINTAINERS | 7 + drivers/block/rnull.rs | 4 +- rust/Makefile | 43 +- rust/bindings/bindings_helper.h | 1 + rust/exports.c | 1 - rust/helpers/helpers.c | 1 + rust/helpers/slab.c | 6 + rust/helpers/vmalloc.c | 9 + rust/kernel/alloc.rs | 152 ++++- rust/kernel/alloc/allocator.rs | 198 ++++-- rust/kernel/alloc/allocator_test.rs | 200 ++++++ rust/kernel/alloc/box_ext.rs | 87 --- rust/kernel/alloc/kbox.rs | 465 ++++++++++++++ rust/kernel/alloc/kvec.rs | 905 ++++++++++++++++++++++++++++ rust/kernel/alloc/vec_ext.rs | 185 ------ rust/kernel/error.rs | 6 +- rust/kernel/init.rs | 95 +-- rust/kernel/init/__internal.rs | 2 +- rust/kernel/lib.rs | 1 - rust/kernel/prelude.rs | 5 +- rust/kernel/rbtree.rs | 49 +- rust/kernel/str.rs | 35 +- rust/kernel/sync/arc.rs | 17 +- rust/kernel/sync/condvar.rs | 4 +- rust/kernel/sync/lock/mutex.rs | 2 +- rust/kernel/sync/lock/spinlock.rs | 2 +- rust/kernel/sync/locked_by.rs | 2 +- rust/kernel/types.rs | 52 +- rust/kernel/uaccess.rs | 17 +- rust/kernel/workqueue.rs | 20 +- rust/macros/lib.rs | 12 +- samples/rust/rust_minimal.rs | 4 +- scripts/Makefile.build | 7 +- scripts/generate_rust_analyzer.py | 11 +- 34 files changed, 2029 insertions(+), 578 deletions(-) create mode 100644 rust/helpers/vmalloc.c create mode 100644 rust/kernel/alloc/allocator_test.rs delete mode 100644 rust/kernel/alloc/box_ext.rs create mode 100644 rust/kernel/alloc/kbox.rs create mode 100644 rust/kernel/alloc/kvec.rs delete mode 100644 rust/kernel/alloc/vec_ext.rs base-commit: db8c7e4c95acc68f1e1cd51e0a7f1532c69a23c9 -- 2.46.0
