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From: Andreas Hindborg <a.hindborg@kernel.org>
To: "Boqun Feng" <boqun.feng@gmail.com>,
	"Jens Axboe" <axboe@kernel.dk>, "Miguel Ojeda" <ojeda@kernel.org>,
	"Gary Guo" <gary@garyguo.net>,
	"Björn Roy Baron" <bjorn3_gh@protonmail.com>,
	"Benno Lossin" <lossin@kernel.org>,
	"Alice Ryhl" <aliceryhl@google.com>,
	"Trevor Gross" <tmgross@umich.edu>,
	"Danilo Krummrich" <dakr@kernel.org>,
	"FUJITA Tomonori" <fujita.tomonori@gmail.com>,
	"Frederic Weisbecker" <frederic@kernel.org>,
	"Lyude Paul" <lyude@redhat.com>,
	"Thomas Gleixner" <tglx@kernel.org>,
	"Anna-Maria Behnsen" <anna-maria@linutronix.de>,
	"John Stultz" <jstultz@google.com>,
	"Stephen Boyd" <sboyd@kernel.org>,
	"Lorenzo Stoakes" <lorenzo.stoakes@oracle.com>,
	"Liam R. Howlett" <Liam.Howlett@oracle.com>
Cc: linux-block@vger.kernel.org, rust-for-linux@vger.kernel.org,
	 linux-kernel@vger.kernel.org, linux-mm@kvack.org,
	 Andreas Hindborg <a.hindborg@kernel.org>
Subject: [PATCH 30/79] block: rust: add `hctx` private data support
Date: Mon, 16 Feb 2026 00:35:17 +0100	[thread overview]
Message-ID: <20260216-rnull-v6-19-rc5-send-v1-30-de9a7af4b469@kernel.org> (raw)
In-Reply-To: <20260216-rnull-v6-19-rc5-send-v1-0-de9a7af4b469@kernel.org>

C block device drivers can attach private data to a hardware context
(`struct blk_mq_hw_ctx`). Add support for this feature for Rust block
device drivers via the `Operations::HwData` associated type.

The private data is created in the `init_hctx` callback and stored in
the `driver_data` field of `blk_mq_hw_ctx`. It is passed to `queue_rq`,
`commit_rqs`, and `poll` callbacks, and is released in `exit_hctx`.

Signed-off-by: Andreas Hindborg <a.hindborg@kernel.org>
---
 drivers/block/rnull/rnull.rs       |  8 +++-
 rust/kernel/block/mq.rs            | 23 ++++++++++-
 rust/kernel/block/mq/operations.rs | 85 +++++++++++++++++++++++++++++++-------
 3 files changed, 97 insertions(+), 19 deletions(-)

diff --git a/drivers/block/rnull/rnull.rs b/drivers/block/rnull/rnull.rs
index 9e8d085924040..4e226186d2f36 100644
--- a/drivers/block/rnull/rnull.rs
+++ b/drivers/block/rnull/rnull.rs
@@ -506,6 +506,7 @@ impl Operations for NullBlkDevice {
     type QueueData = Pin<KBox<QueueData>>;
     type RequestData = Pdu;
     type TagSetData = ();
+    type HwData = ();
 
     fn new_request_data() -> impl PinInit<Self::RequestData> {
         pin_init!(Pdu {
@@ -516,6 +517,7 @@ fn new_request_data() -> impl PinInit<Self::RequestData> {
 
     #[inline(always)]
     fn queue_rq(
+        _hw_data: (),
         queue_data: Pin<&QueueData>,
         mut rq: Owned<mq::Request<Self>>,
         _is_last: bool,
@@ -546,7 +548,11 @@ fn queue_rq(
         Ok(())
     }
 
-    fn commit_rqs(_queue_data: Pin<&QueueData>) {}
+    fn commit_rqs(_hw_data: (), _queue_data: Pin<&QueueData>) {}
+
+    fn init_hctx(_tagset_data: (), _hctx_idx: u32) -> Result {
+        Ok(())
+    }
 
     fn complete(rq: ARef<mq::Request<Self>>) {
         Self::end_request(
diff --git a/rust/kernel/block/mq.rs b/rust/kernel/block/mq.rs
index 415be31e9a777..3eab3ca8f5480 100644
--- a/rust/kernel/block/mq.rs
+++ b/rust/kernel/block/mq.rs
@@ -17,6 +17,12 @@
 //! - The [`GenDisk`] type that abstracts the C type `struct gendisk`.
 //! - The [`Request`] type that abstracts the C type `struct request`.
 //!
+//! Many of the C types that this module abstracts allow a driver to carry
+//! private data, either embedded in the struct directly, or as a C `void*`. In
+//! these abstractions, this data is typed. The types of the data is defined by
+//! associated types in `Operations`, see [`Operations::RequestData`] for an
+//! example.
+//!
 //! The kernel will interface with the block device driver by calling the method
 //! implementations of the `Operations` trait.
 //!
@@ -71,6 +77,7 @@
 //! impl Operations for MyBlkDevice {
 //!     type RequestData = ();
 //!     type QueueData = ();
+//!     type HwData = ();
 //!     type TagSetData = ();
 //!
 //!     fn new_request_data(
@@ -78,12 +85,17 @@
 //!         pin_init::zeroed::<()>()
 //!     }
 //!
-//!     fn queue_rq(_queue_data: (), rq: Owned<Request<Self>>, _is_last: bool) -> Result {
+//!     fn queue_rq(
+//!         _hw_data: (),
+//!         _queue_data: (),
+//!         rq: Owned<Request<Self>>,
+//!         _is_last: bool
+//!     ) -> Result {
 //!         rq.end_ok();
 //!         Ok(())
 //!     }
 //!
-//!     fn commit_rqs(_queue_data: ()) {}
+//!     fn commit_rqs(_hw_data: (), _queue_data: ()) {}
 //!
 //!     fn complete(rq: ARef<Request<Self>>) {
 //!         OwnableRefCounted::try_from_shared(rq)
@@ -91,6 +103,13 @@
 //!             .expect("Fatal error - expected to be able to end request")
 //!             .end_ok();
 //!     }
+//!
+//!     fn init_hctx(
+//!         _tagset_data: (),
+//!         _hctx_idx: u32,
+//!     ) -> Result<Self::HwData> {
+//!         Ok(())
+//!     }
 //! }
 //!
 //! let tagset: Arc<TagSet<MyBlkDevice>> =
diff --git a/rust/kernel/block/mq/operations.rs b/rust/kernel/block/mq/operations.rs
index 9aab6240428cc..6641c340d87f4 100644
--- a/rust/kernel/block/mq/operations.rs
+++ b/rust/kernel/block/mq/operations.rs
@@ -44,6 +44,10 @@ pub trait Operations: Sized {
     /// the `GenDisk` associated with this `Operations` implementation.
     type QueueData: ForeignOwnable;
 
+    /// Data associated with a dispatch queue. This is stored as a pointer in
+    /// the C `struct blk_mq_hw_ctx` that represents a hardware queue.
+    type HwData: ForeignOwnable;
+
     /// Data associated with a `TagSet`. This is stored as a pointer in `struct
     /// blk_mq_tag_set`.
     type TagSetData: ForeignOwnable;
@@ -54,20 +58,30 @@ pub trait Operations: Sized {
     /// Called by the kernel to queue a request with the driver. If `is_last` is
     /// `false`, the driver is allowed to defer committing the request.
     fn queue_rq(
+        hw_data: ForeignBorrowed<'_, Self::HwData>,
         queue_data: ForeignBorrowed<'_, Self::QueueData>,
         rq: Owned<Request<Self>>,
         is_last: bool,
     ) -> Result;
 
     /// Called by the kernel to indicate that queued requests should be submitted.
-    fn commit_rqs(queue_data: ForeignBorrowed<'_, Self::QueueData>);
+    fn commit_rqs(
+        hw_data: ForeignBorrowed<'_, Self::HwData>,
+        queue_data: ForeignBorrowed<'_, Self::QueueData>,
+    );
+
+    /// Called by the kernel to allocate and initialize a driver specific hardware context data.
+    fn init_hctx(
+        tagset_data: ForeignBorrowed<'_, Self::TagSetData>,
+        hctx_idx: u32,
+    ) -> Result<Self::HwData>;
 
     /// Called by the kernel when the request is completed.
     fn complete(rq: ARef<Request<Self>>);
 
     /// Called by the kernel to poll the device for completed requests. Only
     /// used for poll queues.
-    fn poll() -> bool {
+    fn poll(_hw_data: ForeignBorrowed<'_, Self::HwData>) -> bool {
         build_error!(crate::error::VTABLE_DEFAULT_ERROR)
     }
 }
@@ -127,6 +141,11 @@ impl<T: Operations> OperationsVTable<T> {
         let mut rq =
             unsafe { Owned::from_raw(NonNull::<Request<T>>::new_unchecked((*bd).rq.cast())) };
 
+        // SAFETY: The safety requirement for this function ensure that `hctx`
+        // is valid and that `driver_data` was produced by a call to
+        // `into_foreign` in `Self::init_hctx_callback`.
+        let hw_data = unsafe { T::HwData::borrow((*hctx).driver_data) };
+
         // SAFETY: `hctx` is valid as required by this function.
         let queue_data = unsafe { (*(*hctx).queue).queuedata };
 
@@ -140,6 +159,7 @@ impl<T: Operations> OperationsVTable<T> {
         unsafe { rq.start_unchecked() };
 
         let ret = T::queue_rq(
+            hw_data,
             queue_data,
             rq,
             // SAFETY: `bd` is valid as required by the safety requirement for
@@ -162,6 +182,10 @@ impl<T: Operations> OperationsVTable<T> {
     /// This function may only be called by blk-mq C infrastructure. The caller
     /// must ensure that `hctx` is valid.
     unsafe extern "C" fn commit_rqs_callback(hctx: *mut bindings::blk_mq_hw_ctx) {
+        // SAFETY: `driver_data` was installed by us in `init_hctx_callback` as
+        // the result of a call to `into_foreign`.
+        let hw_data = unsafe { T::HwData::borrow((*hctx).driver_data) };
+
         // SAFETY: `hctx` is valid as required by this function.
         let queue_data = unsafe { (*(*hctx).queue).queuedata };
 
@@ -170,7 +194,7 @@ impl<T: Operations> OperationsVTable<T> {
         // `ForeignOwnable::from_foreign()` is only called when the tagset is
         // dropped, which happens after we are dropped.
         let queue_data = unsafe { T::QueueData::borrow(queue_data) };
-        T::commit_rqs(queue_data)
+        T::commit_rqs(hw_data, queue_data)
     }
 
     /// This function is called by the C kernel. A pointer to this function is
@@ -194,12 +218,18 @@ impl<T: Operations> OperationsVTable<T> {
     ///
     /// # Safety
     ///
-    /// This function may only be called by blk-mq C infrastructure.
+    /// This function may only be called by blk-mq C infrastructure. `hctx` must
+    /// be a pointer to a valid and aligned `struct blk_mq_hw_ctx` that was
+    /// previously initialized by a call to `init_hctx_callback`.
     unsafe extern "C" fn poll_callback(
-        _hctx: *mut bindings::blk_mq_hw_ctx,
+        hctx: *mut bindings::blk_mq_hw_ctx,
         _iob: *mut bindings::io_comp_batch,
     ) -> crate::ffi::c_int {
-        T::poll().into()
+        // SAFETY: By function safety requirement, `hctx` was initialized by
+        // `init_hctx_callback` and thus `driver_data` came from a call to
+        // `into_foreign`.
+        let hw_data = unsafe { T::HwData::borrow((*hctx).driver_data) };
+        T::poll(hw_data).into()
     }
 
     /// This function is called by the C kernel. A pointer to this function is
@@ -207,15 +237,29 @@ impl<T: Operations> OperationsVTable<T> {
     ///
     /// # Safety
     ///
-    /// This function may only be called by blk-mq C infrastructure. This
-    /// function may only be called once before `exit_hctx_callback` is called
-    /// for the same context.
+    /// This function may only be called by blk-mq C infrastructure.
+    /// `tagset_data` must be initialized by the initializer returned by
+    /// `TagSet::try_new` as part of tag set initialization. `hctx` must be a
+    /// pointer to a valid `blk_mq_hw_ctx` where the `driver_data` field was not
+    /// yet initialized. This function may only be called onece before
+    /// `exit_hctx_callback` is called for the same context.
     unsafe extern "C" fn init_hctx_callback(
-        _hctx: *mut bindings::blk_mq_hw_ctx,
-        _tagset_data: *mut crate::ffi::c_void,
-        _hctx_idx: crate::ffi::c_uint,
-    ) -> crate::ffi::c_int {
-        from_result(|| Ok(0))
+        hctx: *mut bindings::blk_mq_hw_ctx,
+        tagset_data: *mut core::ffi::c_void,
+        hctx_idx: crate::ffi::c_uint,
+    ) -> core::ffi::c_int {
+        from_result(|| {
+            // SAFETY: By the safety requirements of this function,
+            // `tagset_data` came from a call to `into_foreign` when the
+            // `TagSet` was initialized.
+            let tagset_data = unsafe { T::TagSetData::borrow(tagset_data) };
+            let data = T::init_hctx(tagset_data, hctx_idx)?;
+
+            // SAFETY: by the safety requirments of this function, `hctx` is
+            // valid for write
+            unsafe { (*hctx).driver_data = data.into_foreign().cast() };
+            Ok(0)
+        })
     }
 
     /// This function is called by the C kernel. A pointer to this function is
@@ -223,11 +267,20 @@ impl<T: Operations> OperationsVTable<T> {
     ///
     /// # Safety
     ///
-    /// This function may only be called by blk-mq C infrastructure.
+    /// This function may only be called by blk-mq C infrastructure. `hctx` must
+    /// be a valid pointer that was previously initialized by a call to
+    /// `init_hctx_callback`. This function may be called only once after
+    /// `init_hctx_callback` was called.
     unsafe extern "C" fn exit_hctx_callback(
-        _hctx: *mut bindings::blk_mq_hw_ctx,
+        hctx: *mut bindings::blk_mq_hw_ctx,
         _hctx_idx: crate::ffi::c_uint,
     ) {
+        // SAFETY: By the safety requirements of this function, `hctx` is valid for read.
+        let ptr = unsafe { (*hctx).driver_data };
+
+        // SAFETY: By the safety requirements of this function, `ptr` came from
+        // a call to `into_foreign` in `init_hctx_callback`
+        unsafe { T::HwData::from_foreign(ptr) };
     }
 
     /// This function is called by the C kernel. A pointer to this function is

-- 
2.51.2




  parent reply	other threads:[~2026-02-16  4:34 UTC|newest]

Thread overview: 82+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-02-15 23:34 [PATCH 00/79] block: rnull: complete the rust null block driver Andreas Hindborg
2026-02-15 23:34 ` [PATCH 01/79] block: rnull: adopt new formatting guidelines Andreas Hindborg
2026-02-15 23:34 ` [PATCH 02/79] block: rnull: add module parameters Andreas Hindborg
2026-02-15 23:34 ` [PATCH 03/79] block: rnull: add macros to define configfs attributes Andreas Hindborg
2026-02-15 23:34 ` [PATCH 04/79] block: rust: fix generation of bindings to `BLK_STS_.*` Andreas Hindborg
2026-02-15 23:34 ` [PATCH 05/79] block: rust: change `queue_rq` request type to `Owned` Andreas Hindborg
2026-02-15 23:34 ` [PATCH 06/79] block: rust: add `Request` private data support Andreas Hindborg
2026-02-15 23:34 ` [PATCH 07/79] block: rust: allow `hrtimer::Timer` in `RequestData` Andreas Hindborg
2026-02-15 23:34 ` [PATCH 08/79] block: rnull: add timer completion mode Andreas Hindborg
2026-02-15 23:34 ` [PATCH 09/79] block: rust: introduce `kernel::block::bio` module Andreas Hindborg
2026-02-15 23:34 ` [PATCH 10/79] block: rust: add `command` getter to `Request` Andreas Hindborg
2026-02-15 23:34 ` [PATCH 11/79] block: rust: mq: use GFP_KERNEL from prelude Andreas Hindborg
2026-02-15 23:34 ` [PATCH 12/79] block: rust: add `TagSet` flags Andreas Hindborg
2026-02-15 23:35 ` [PATCH 13/79] block: rnull: add memory backing Andreas Hindborg
2026-02-15 23:35 ` [PATCH 14/79] block: rnull: add submit queue count config option Andreas Hindborg
2026-02-15 23:35 ` [PATCH 15/79] block: rnull: add `use_per_node_hctx` " Andreas Hindborg
2026-02-15 23:35 ` [PATCH 16/79] block: rust: allow specifying home node when constructing `TagSet` Andreas Hindborg
2026-02-15 23:35 ` [PATCH 17/79] block: rnull: allow specifying the home numa node Andreas Hindborg
2026-02-15 23:35 ` [PATCH 18/79] block: rust: add Request::sectors() method Andreas Hindborg
2026-02-15 23:35 ` [PATCH 19/79] block: rust: mq: add max_hw_discard_sectors support to GenDiskBuilder Andreas Hindborg
2026-02-15 23:35 ` [PATCH 20/79] block: rnull: add discard support Andreas Hindborg
2026-02-15 23:35 ` [PATCH 21/79] block: rust: add `NoDefaultScheduler` flag for `TagSet` Andreas Hindborg
2026-02-15 23:35 ` [PATCH 22/79] block: rnull: add no_sched module parameter and configfs attribute Andreas Hindborg
2026-02-15 23:35 ` [PATCH 23/79] block: rust: change sector type from usize to u64 Andreas Hindborg
2026-02-15 23:35 ` [PATCH 24/79] block: rust: add `BadBlocks` for bad block tracking Andreas Hindborg
2026-02-15 23:35 ` [PATCH 25/79] block: rust: mq: add Request::end() method for custom status codes Andreas Hindborg
2026-02-15 23:35 ` [PATCH 26/79] block: rnull: add badblocks support Andreas Hindborg
2026-02-15 23:35 ` [PATCH 27/79] block: rnull: add badblocks_once support Andreas Hindborg
2026-02-15 23:35 ` [PATCH 28/79] block: rnull: add partial I/O support for bad blocks Andreas Hindborg
2026-02-15 23:35 ` [PATCH 29/79] block: rust: add `TagSet` private data support Andreas Hindborg
2026-02-15 23:35 ` Andreas Hindborg [this message]
2026-02-15 23:35 ` [PATCH 31/79] block: rnull: add volatile cache emulation Andreas Hindborg
2026-02-15 23:35 ` [PATCH 32/79] block: rust: implement `Sync` for `GenDisk` Andreas Hindborg
2026-02-15 23:35 ` [PATCH 33/79] block: rust: add a back reference feature to `GenDisk` Andreas Hindborg
2026-02-15 23:35 ` [PATCH 34/79] block: rust: introduce an idle type state for `Request` Andreas Hindborg
2026-02-15 23:35 ` [PATCH 35/79] block: rust: add a request queue abstraction Andreas Hindborg
2026-02-15 23:35 ` [PATCH 36/79] block: rust: add a method to get the request queue for a request Andreas Hindborg
2026-02-15 23:35 ` [PATCH 37/79] block: rust: introduce `kernel::block::error` Andreas Hindborg
2026-02-15 23:35 ` [PATCH 38/79] block: rust: require `queue_rq` to return a `BlkResult` Andreas Hindborg
2026-02-15 23:35 ` [PATCH 39/79] block: rust: add `GenDisk::queue_data` Andreas Hindborg
2026-02-15 23:35 ` [PATCH 40/79] block: rnull: add bandwidth limiting Andreas Hindborg
2026-02-15 23:35 ` [PATCH 41/79] block: rnull: add blocking queue mode Andreas Hindborg
2026-02-15 23:35 ` [PATCH 42/79] block: rnull: add shared tags Andreas Hindborg
2026-02-15 23:35 ` [PATCH 43/79] block: rnull: add queue depth config option Andreas Hindborg
2026-02-15 23:35 ` [PATCH 44/79] block: rust: add an abstraction for `bindings::req_op` Andreas Hindborg
2026-02-15 23:35 ` [PATCH 45/79] block: rust: add a method to set the target sector of a request Andreas Hindborg
2026-02-15 23:35 ` [PATCH 46/79] block: rust: move gendisk vtable construction to separate function Andreas Hindborg
2026-02-15 23:35 ` [PATCH 47/79] block: rust: add zoned block device support Andreas Hindborg
2026-02-15 23:35 ` [PATCH 48/79] block: rnull: add zoned storage support Andreas Hindborg
2026-02-15 23:35 ` [PATCH 49/79] block: rust: add `map_queues` support Andreas Hindborg
2026-02-15 23:35 ` [PATCH 50/79] block: rust: add an abstraction for `struct blk_mq_queue_map` Andreas Hindborg
2026-02-15 23:35 ` [PATCH 51/79] block: rust: add polled completion support Andreas Hindborg
2026-02-15 23:35 ` [PATCH 52/79] block: rust: add accessors to `TagSet` Andreas Hindborg
2026-02-15 23:35 ` [PATCH 53/79] block: rnull: add polled completion support Andreas Hindborg
2026-02-15 23:35 ` [PATCH 54/79] block: rnull: add REQ_OP_FLUSH support Andreas Hindborg
2026-02-15 23:35 ` [PATCH 55/79] block: rust: add request flags abstraction Andreas Hindborg
2026-02-15 23:35 ` [PATCH 56/79] block: rust: add abstraction for block queue feature flags Andreas Hindborg
2026-02-15 23:35 ` [PATCH 57/79] block: rust: allow setting write cache and FUA flags for `GenDisk` Andreas Hindborg
2026-02-15 23:35 ` [PATCH 58/79] block: rust: add `Segment::copy_to_page_limit` Andreas Hindborg
2026-02-15 23:35 ` [PATCH 59/79] block: rnull: add fua support Andreas Hindborg
2026-02-15 23:35 ` [PATCH 60/79] block: fix arg type in `blk_mq_update_nr_hw_queues` Andreas Hindborg
2026-02-15 23:35 ` [PATCH 61/79] block: rust: add `GenDisk::tag_set` Andreas Hindborg
2026-02-15 23:35 ` [PATCH 62/79] block: rust: add `TagSet::update_hw_queue_count` Andreas Hindborg
2026-02-16 23:59   ` Ken Kurematsu
2026-02-17  9:54     ` Andreas Hindborg
2026-02-15 23:35 ` [PATCH 63/79] block: rnull: add an option to change the number of hardware queues Andreas Hindborg
2026-02-15 23:35 ` [PATCH 64/79] block: rust: add an abstraction for `struct rq_list` Andreas Hindborg
2026-02-15 23:35 ` [PATCH 65/79] block: rust: add `queue_rqs` vtable hook Andreas Hindborg
2026-02-15 23:35 ` [PATCH 66/79] block: rnull: support queue_rqs Andreas Hindborg
2026-02-15 23:35 ` [PATCH 67/79] block: rust: remove the `is_poll` parameter from `queue_rq` Andreas Hindborg
2026-02-15 23:35 ` [PATCH 68/79] block: rust: add a debug assert for refcounts Andreas Hindborg
2026-02-15 23:35 ` [PATCH 69/79] block: rust: add `TagSet::tag_to_rq` Andreas Hindborg
2026-02-15 23:35 ` [PATCH 70/79] block: rust: add `Request::queue_index` Andreas Hindborg
2026-02-15 23:35 ` [PATCH 71/79] block: rust: add `Request::requeue` Andreas Hindborg
2026-02-15 23:35 ` [PATCH 72/79] block: rust: add `request_timeout` hook Andreas Hindborg
2026-02-15 23:36 ` [PATCH 73/79] block: rnull: add fault injection support Andreas Hindborg
2026-02-15 23:36 ` [PATCH 74/79] block: rust: add max_sectors option to `GenDiskBuilder` Andreas Hindborg
2026-02-15 23:36 ` [PATCH 75/79] block: rnull: allow configuration of the maximum IO size Andreas Hindborg
2026-02-15 23:36 ` [PATCH 76/79] block: rust: add `virt_boundary_mask` option to `GenDiskBuilder` Andreas Hindborg
2026-02-15 23:36 ` [PATCH 77/79] block: rnull: add `virt_boundary` option Andreas Hindborg
2026-02-15 23:36 ` [PATCH 78/79] block: rnull: add `shared_tag_bitmap` config option Andreas Hindborg
2026-02-15 23:36 ` [PATCH 79/79] block: rnull: add zone offline and readonly configfs files Andreas Hindborg

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