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Date: Tue, 23 Apr 2024 17:43:08 +0200
From: Danilo Krummrich <dakr@...hat.com>
To: Wedson Almeida Filho <wedsonaf@...il.com>, rust-for-linux@...r.kernel.org
Cc: Miguel Ojeda <ojeda@...nel.org>, Alex Gaynor <alex.gaynor@...il.com>,
Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>,
Björn Roy Baron <bjorn3_gh@...tonmail.com>,
Benno Lossin <benno.lossin@...ton.me>,
Andreas Hindborg <a.hindborg@...sung.com>, Alice Ryhl
<aliceryhl@...gle.com>, linux-kernel@...r.kernel.org,
Wedson Almeida Filho <walmeida@...rosoft.com>, ajanulgu@...hat.com
Subject: Re: [PATCH v3 00/10] Allocation APIs
Hi all,
On 3/28/24 02:35, Wedson Almeida Filho wrote:
> From: Wedson Almeida Filho <walmeida@...rosoft.com>
>
> Revamp how we use the `alloc` crate.
>
> We currently have a fork of the crate with changes to `Vec`; other
> changes have been upstreamed (to the Rust project). This series removes
> the fork and exposes all the functionality as extension traits.
>
> Additionally, it also introduces allocation flag parameters to all
> functions that may result in allocations (e.g., `Box::new`, `Arc::new`,
> `Vec::push`, etc.) without the `try_` prefix -- the names are available
> because we build `alloc` with `no_global_oom_handling`.
>
> Lastly, the series also removes our reliance on the `allocator_api`
> unstable feature.
>
> Long term, we still want to make such functionality available in
> upstream Rust, but this allows us to make progress now and reduces our
> maintainance burden.
>
> In summary:
> 1. Removes `alloc` fork
> 2. Removes use of `allocator_api` unstable feature
> 3. Introduces flags (e.g., GFP_KERNEL, GFP_ATOMIC) when allocating
With that series, how do we implement alternative allocators, such as
(k)vmalloc or DMA coherent?
For instance, I recently sketched up some firmware bindings we want to
use in Nova providing
fn copy<A: core::alloc::Allocator>(&self, alloc: A) -> Result<Vec<u8,
A>> [1]
making use of Vec::try_with_capacity_in(). How would I implement
something similar now?
- Danilo
[1]
https://gitlab.freedesktop.org/drm/nova/-/blob/topic/firmware/rust/kernel/firmware.rs?ref_type=heads#L63
>
> ---
>
> Changes in v3:
> - Rebased on top of the latest `rust-next` branch.
> - Updated `krealloc_aligned` to use `Flags` instead of `bindings::gfp_t`.
> - Added __GFP_ZERO to flags, as part of the previous change.
> - Avoiding temporary stack value in `Box::new_uninit`.
> - Implement `Box::new` using `Box::new_uninit` (so only one of them actually
> allocates).
> - Added examples/tests to `VecExt` methods.
> - Fixed bug in length in `extend_from_slice`
> - Link to v2: https://lore.kernel.org/rust-for-linux/20240327023531.187880-1-wedsonaf@gmail.com/T/#t
>
> Changes in v2:
> - Updated description of `alloc` crate.
> - Renamed vecext and boxext modules to vec_ext and box_ext.
> - Added derive directive to `AllocError`.
> - Updated safety comment in `BoxExt::new`.
> - Updated `VecExt::push` and `VecExt::extend_from_slice` to use
> `spare_capacity_mut`
> - Added directive to not compile `destructure` and `rebuild` when `test` or
> `testlib` are configured. Otherwise we have a warning because `push` and
> `extend_from_slice` don't use them anymore.
> - Updated indentation in `Arc::new_uninit`
> - Moved the removal of `TryReserveError` convesion to `Error` to patch 7, where
> usage of `TryReserveError` is actually removed.
> - Link to v1: https://lore.kernel.org/rust-for-linux/20240325195418.166013-1-wedsonaf@gmail.com/T/#t
>
> Wedson Almeida Filho (10):
> rust: kernel: move `allocator` module under `alloc`
> rust: alloc: introduce the `VecExt` trait
> kbuild: use the upstream `alloc` crate
> rust: alloc: remove our fork of the `alloc` crate
> rust: alloc: introduce allocation flags
> rust: alloc: introduce the `BoxExt` trait
> rust: alloc: update `VecExt` to take allocation flags
> rust: sync: update `Arc` and `UniqueArc` to take allocation flags
> rust: init: update `init` module to take allocation flags
> rust: kernel: remove usage of `allocator_api` unstable feature
>
> rust/Makefile | 16 +-
> rust/alloc/README.md | 36 -
> rust/alloc/alloc.rs | 452 ----
> rust/alloc/boxed.rs | 2463 -----------------
> rust/alloc/collections/mod.rs | 160 --
> rust/alloc/lib.rs | 288 --
> rust/alloc/raw_vec.rs | 611 -----
> rust/alloc/slice.rs | 890 -------
> rust/alloc/vec/drain.rs | 255 --
> rust/alloc/vec/extract_if.rs | 115 -
> rust/alloc/vec/into_iter.rs | 454 ----
> rust/alloc/vec/is_zero.rs | 204 --
> rust/alloc/vec/mod.rs | 3683 --------------------------
> rust/alloc/vec/partial_eq.rs | 49 -
> rust/alloc/vec/set_len_on_drop.rs | 35 -
> rust/alloc/vec/spec_extend.rs | 119 -
> rust/bindings/bindings_helper.h | 3 +
> rust/kernel/alloc.rs | 74 +
> rust/kernel/{ => alloc}/allocator.rs | 17 +-
> rust/kernel/alloc/box_ext.rs | 59 +
> rust/kernel/alloc/vec_ext.rs | 176 ++
> rust/kernel/error.rs | 13 +-
> rust/kernel/init.rs | 57 +-
> rust/kernel/lib.rs | 5 +-
> rust/kernel/prelude.rs | 2 +
> rust/kernel/str.rs | 6 +-
> rust/kernel/sync/arc.rs | 50 +-
> rust/kernel/sync/condvar.rs | 2 +-
> rust/kernel/sync/lock/mutex.rs | 2 +-
> rust/kernel/sync/lock/spinlock.rs | 2 +-
> rust/kernel/types.rs | 4 +-
> rust/kernel/workqueue.rs | 14 +-
> samples/rust/rust_minimal.rs | 6 +-
> samples/rust/rust_print.rs | 4 +-
> scripts/generate_rust_analyzer.py | 2 +-
> 35 files changed, 405 insertions(+), 9923 deletions(-)
> delete mode 100644 rust/alloc/README.md
> delete mode 100644 rust/alloc/alloc.rs
> delete mode 100644 rust/alloc/boxed.rs
> delete mode 100644 rust/alloc/collections/mod.rs
> delete mode 100644 rust/alloc/lib.rs
> delete mode 100644 rust/alloc/raw_vec.rs
> delete mode 100644 rust/alloc/slice.rs
> delete mode 100644 rust/alloc/vec/drain.rs
> delete mode 100644 rust/alloc/vec/extract_if.rs
> delete mode 100644 rust/alloc/vec/into_iter.rs
> delete mode 100644 rust/alloc/vec/is_zero.rs
> delete mode 100644 rust/alloc/vec/mod.rs
> delete mode 100644 rust/alloc/vec/partial_eq.rs
> delete mode 100644 rust/alloc/vec/set_len_on_drop.rs
> delete mode 100644 rust/alloc/vec/spec_extend.rs
> create mode 100644 rust/kernel/alloc.rs
> rename rust/kernel/{ => alloc}/allocator.rs (86%)
> create mode 100644 rust/kernel/alloc/box_ext.rs
> create mode 100644 rust/kernel/alloc/vec_ext.rs
>
>
> base-commit: 768409cff6cc89fe1194da880537a09857b6e4db
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