linux-kernel - [PATCH v2 3/4] rust: drm: gem: Add ObjectFile type alias

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20250516171030.776924-4-lyude@redhat.com>
Date: Fri, 16 May 2025 13:09:18 -0400
From: Lyude Paul <lyude@...hat.com>
To: dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org,
	rust-for-linux@...r.kernel.org
Cc: David Airlie <airlied@...il.com>,
	Simona Vetter <simona@...ll.ch>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	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@...nel.org>,
	Alice Ryhl <aliceryhl@...gle.com>,
	Trevor Gross <tmgross@...ch.edu>,
	Danilo Krummrich <dakr@...nel.org>,
	Daniel Almeida <daniel.almeida@...labora.com>,
	Asahi Lina <lina@...hilina.net>,
	Alyssa Rosenzweig <alyssa@...enzweig.io>
Subject: [PATCH v2 3/4] rust: drm: gem: Add ObjectFile type alias

Just to reduce the clutter with the File<…> types in gem.rs.

Signed-off-by: Lyude Paul <lyude@...hat.com>
---
 rust/kernel/drm/gem/mod.rs | 26 ++++++++++++++------------
 1 file changed, 14 insertions(+), 12 deletions(-)

diff --git a/rust/kernel/drm/gem/mod.rs b/rust/kernel/drm/gem/mod.rs
index c17b36948bae3..2b81298d29765 100644
--- a/rust/kernel/drm/gem/mod.rs
+++ b/rust/kernel/drm/gem/mod.rs
@@ -17,6 +17,13 @@
 /// A type alias for the Object type in use by a [`drm::Driver`].
 pub type DriverObject<T> = <<T as BaseDriverObject>::Driver as drm::Driver>::Object;
 
+/// A type alias for retrieving a [`Driver`]s [`DriverFile`] implementation from its
+/// [`DriverObject`] implementation.
+///
+/// [`Driver`]: drm::Driver
+/// [`DriverFile`]: drm::file::DriverFile
+pub type ObjectFile<T> = drm::File<<<T as BaseDriverObject>::Driver as drm::Driver>::File>;
+
 /// GEM object functions, which must be implemented by drivers.
 pub trait BaseDriverObject: Sync + Send + Sized {
     /// Parent `Driver` for this object.
@@ -26,15 +33,12 @@ pub trait BaseDriverObject: Sync + Send + Sized {
     fn new(dev: &drm::Device<Self::Driver>, size: usize) -> impl PinInit<Self, Error>;
 
     /// Open a new handle to an existing object, associated with a File.
-    fn open(
-        _obj: &DriverObject<Self>,
-        _file: &drm::File<<Self::Driver as drm::Driver>::File>,
-    ) -> Result {
+    fn open(_obj: &DriverObject<Self>, _file: &ObjectFile<Self>) -> Result {
         Ok(())
     }
 
     /// Close a handle to an existing object, associated with a File.
-    fn close(_obj: &DriverObject<Self>, _file: &drm::File<<Self::Driver as drm::Driver>::File>) {}
+    fn close(_obj: &DriverObject<Self>, _file: &ObjectFile<Self>) {}
 }
 
 /// Trait that represents a GEM object subtype
@@ -78,7 +82,8 @@ extern "C" fn open_callback<T: BaseDriverObject>(
     raw_file: *mut bindings::drm_file,
 ) -> core::ffi::c_int {
     // SAFETY: `open_callback` is only ever called with a valid pointer to a `struct drm_file`.
-    let file = unsafe { drm::File::<<T::Driver as drm::Driver>::File>::as_ref(raw_file) };
+    let file = unsafe { ObjectFile::<T>::as_ref(raw_file) };
+
     // SAFETY: `open_callback` is specified in the AllocOps structure for `DriverObject<T>`,
     // ensuring that `raw_obj` is contained within a `DriverObject<T>`
     let obj = unsafe { DriverObject::<T>::as_ref(raw_obj) };
@@ -94,7 +99,7 @@ extern "C" fn close_callback<T: BaseDriverObject>(
     raw_file: *mut bindings::drm_file,
 ) {
     // SAFETY: `open_callback` is only ever called with a valid pointer to a `struct drm_file`.
-    let file = unsafe { drm::File::<<T::Driver as drm::Driver>::File>::as_ref(raw_file) };
+    let file = unsafe { ObjectFile::<T>::as_ref(raw_file) };
 
     // SAFETY: `close_callback` is specified in the AllocOps structure for `Object<T>`, ensuring
     // that `raw_obj` is indeed contained within a `Object<T>`.
@@ -125,7 +130,7 @@ fn size(&self) -> usize {
 
     /// Creates a new handle for the object associated with a given `File`
     /// (or returns an existing one).
-    fn create_handle(&self, file: &drm::File<<Self::Driver as drm::Driver>::File>) -> Result<u32>
+    fn create_handle(&self, file: &ObjectFile<Self>) -> Result<u32>
     where
         Self: BaseDriverObject,
     {
@@ -138,10 +143,7 @@ fn create_handle(&self, file: &drm::File<<Self::Driver as drm::Driver>::File>) -
     }
 
     /// Looks up an object by its handle for a given `File`.
-    fn lookup_handle(
-        file: &drm::File<<Self::Driver as drm::Driver>::File>,
-        handle: u32,
-    ) -> Result<ARef<Self>>
+    fn lookup_handle(file: &ObjectFile<Self>, handle: u32) -> Result<ARef<Self>>
     where
         Self: BaseDriverObject,
     {
-- 
2.49.0