`build_assert` relies on the compiler to optimize out its error path.
Functions using it with its arguments must thus always be inlined,
otherwise the error path of `build_assert` might not be optimized out,
triggering a build error.

Cc: stable@vger.kernel.org
Fixes: 746680ec6696 ("rust: irq: add flags module")
Reviewed-by: Daniel Almeida <daniel.almeida@collabora.com>
Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
Link: https://patch.msgid.link/20251208-io-build-assert-v3-6-98aded02c1ea@nvidia.com
Signed-off-by: Danilo Krummrich <dakr@kernel.org>

When working with a bus device, many operations are only possible while
the device is still bound. The &Device<Bound> type represents a proof in
the type system that you are in a scope where the device is guaranteed
to still be bound. Since we deregister irq callbacks when unbinding a
device, if an irq callback is running, that implies that the device has
not yet been unbound.

To allow drivers to take advantage of that, add an additional argument
to irq callbacks.

Signed-off-by: Alice Ryhl <aliceryhl@google.com>
Reviewed-by: Boqun Feng <boqun.feng@gmail.com>
Signed-off-by: Daniel Almeida <daniel.almeida@collabora.com>
Link: https://lore.kernel.org/r/20250811-topics-tyr-request_irq2-v9-7-0485dcd9bcbf@collabora.com
Signed-off-by: Danilo Krummrich <dakr@kernel.org>

These accessors can be used to retrieve a irq::Registration and
irq::ThreadedRegistration from a platform device by
index or name. Alternatively, drivers can retrieve an IrqRequest from a
bound platform device for later use.

These accessors ensure that only valid IRQ lines can ever be registered.

Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Tested-by: Joel Fernandes <joelagnelf@nvidia.com>
Tested-by: Dirk Behme <dirk.behme@de.bosch.com>
Signed-off-by: Daniel Almeida <daniel.almeida@collabora.com>
Link: https://lore.kernel.org/r/20250811-topics-tyr-request_irq2-v9-5-0485dcd9bcbf@collabora.com
[ Remove expect(dead_code) from IrqRequest::new(), re-format macros and
  macro invocations to not exceed 100 characters line length. - Danilo ]
Signed-off-by: Danilo Krummrich <dakr@kernel.org>

This patch adds support for threaded IRQs and handlers through
irq::ThreadedRegistration and the irq::ThreadedHandler trait.

Threaded interrupts are more permissive in the sense that further
processing is possible in a kthread. This means that said execution takes
place outside of interrupt context, which is rather restrictive in many
ways.

Registering a threaded irq is dependent upon having an IrqRequest that
was previously allocated by a given device. This will be introduced in
subsequent patches.

Tested-by: Joel Fernandes <joelagnelf@nvidia.com>
Tested-by: Dirk Behme <dirk.behme@de.bosch.com>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Signed-off-by: Daniel Almeida <daniel.almeida@collabora.com>
Link: https://lore.kernel.org/r/20250811-topics-tyr-request_irq2-v9-4-0485dcd9bcbf@collabora.com
[ Add now available intra-doc links back in. - Danilo ]
Signed-off-by: Danilo Krummrich <dakr@kernel.org>

This patch adds support for non-threaded IRQs and handlers through
irq::Registration and the irq::Handler trait.

Registering an irq is dependent upon having a IrqRequest that was
previously allocated by a given device. This will be introduced in
subsequent patches.

Tested-by: Joel Fernandes <joelagnelf@nvidia.com>
Tested-by: Dirk Behme <dirk.behme@de.bosch.com>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Signed-off-by: Daniel Almeida <daniel.almeida@collabora.com>
Link: https://lore.kernel.org/r/20250811-topics-tyr-request_irq2-v9-3-0485dcd9bcbf@collabora.com
[ Remove expect(dead_code) from Flags::into_inner(), add
  expect(dead_code) to IrqRequest::new(), fix intra-doc links. - Danilo ]
Signed-off-by: Danilo Krummrich <dakr@kernel.org>

Manipulating IRQ flags (i.e.: IRQF_*) will soon be necessary, specially to
register IRQ handlers through bindings::request_irq().

Add a kernel::irq::Flags for that purpose.

Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Tested-by: Joel Fernandes <joelagnelf@nvidia.com>
Tested-by: Dirk Behme <dirk.behme@de.bosch.com>
Signed-off-by: Daniel Almeida <daniel.almeida@collabora.com>
Link: https://lore.kernel.org/r/20250811-topics-tyr-request_irq2-v9-2-0485dcd9bcbf@collabora.com
[ Use expect(dead_code) for into_inner(), fix broken intra-doc link and
  typo. - Danilo ]
Signed-off-by: Danilo Krummrich <dakr@kernel.org>