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-rw-r--r--rust/kernel/drm/gem/mod.rs93
1 files changed, 41 insertions, 52 deletions
diff --git a/rust/kernel/drm/gem/mod.rs b/rust/kernel/drm/gem/mod.rs
index a822aedee949..6ccbb25628a1 100644
--- a/rust/kernel/drm/gem/mod.rs
+++ b/rust/kernel/drm/gem/mod.rs
@@ -13,34 +13,34 @@ use crate::{
sync::aref::{ARef, AlwaysRefCounted},
types::Opaque,
};
-use core::{mem, ops::Deref, ptr::NonNull};
+use core::{ops::Deref, ptr::NonNull};
+
+/// A type alias for retrieving a [`Driver`]s [`DriverFile`] implementation from its
+/// [`DriverObject`] implementation.
+///
+/// [`Driver`]: drm::Driver
+/// [`DriverFile`]: drm::file::DriverFile
+pub type DriverFile<T> = drm::File<<<T as DriverObject>::Driver as drm::Driver>::File>;
/// GEM object functions, which must be implemented by drivers.
-pub trait BaseDriverObject<T: BaseObject>: Sync + Send + Sized {
+pub trait DriverObject: Sync + Send + Sized {
+ /// Parent `Driver` for this object.
+ type Driver: drm::Driver;
+
/// Create a new driver data object for a GEM object of a given size.
- fn new(dev: &drm::Device<T::Driver>, size: usize) -> impl PinInit<Self, Error>;
+ 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: &<<T as IntoGEMObject>::Driver as drm::Driver>::Object,
- _file: &drm::File<<<T as IntoGEMObject>::Driver as drm::Driver>::File>,
- ) -> Result {
+ fn open(_obj: &<Self::Driver as drm::Driver>::Object, _file: &DriverFile<Self>) -> Result {
Ok(())
}
/// Close a handle to an existing object, associated with a File.
- fn close(
- _obj: &<<T as IntoGEMObject>::Driver as drm::Driver>::Object,
- _file: &drm::File<<<T as IntoGEMObject>::Driver as drm::Driver>::File>,
- ) {
- }
+ fn close(_obj: &<Self::Driver as drm::Driver>::Object, _file: &DriverFile<Self>) {}
}
/// Trait that represents a GEM object subtype
pub trait IntoGEMObject: Sized + super::private::Sealed + AlwaysRefCounted {
- /// Owning driver for this type
- type Driver: drm::Driver;
-
/// Returns a reference to the raw `drm_gem_object` structure, which must be valid as long as
/// this owning object is valid.
fn as_raw(&self) -> *mut bindings::drm_gem_object;
@@ -75,25 +75,16 @@ unsafe impl<T: IntoGEMObject> AlwaysRefCounted for T {
}
}
-/// Trait which must be implemented by drivers using base GEM objects.
-pub trait DriverObject: BaseDriverObject<Object<Self>> {
- /// Parent `Driver` for this object.
- type Driver: drm::Driver;
-}
-
-extern "C" fn open_callback<T: BaseDriverObject<U>, U: BaseObject>(
+extern "C" fn open_callback<T: DriverObject>(
raw_obj: *mut bindings::drm_gem_object,
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::<<<U as IntoGEMObject>::Driver as drm::Driver>::File>::from_raw(raw_file)
- };
- // SAFETY: `open_callback` is specified in the AllocOps structure for `Object<T>`, ensuring that
- // `raw_obj` is indeed contained within a `Object<T>`.
- let obj = unsafe {
- <<<U as IntoGEMObject>::Driver as drm::Driver>::Object as IntoGEMObject>::from_raw(raw_obj)
- };
+ let file = unsafe { DriverFile::<T>::from_raw(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 { <<T::Driver as drm::Driver>::Object as IntoGEMObject>::from_raw(raw_obj) };
match T::open(obj, file) {
Err(e) => e.to_errno(),
@@ -101,26 +92,21 @@ extern "C" fn open_callback<T: BaseDriverObject<U>, U: BaseObject>(
}
}
-extern "C" fn close_callback<T: BaseDriverObject<U>, U: BaseObject>(
+extern "C" fn close_callback<T: DriverObject>(
raw_obj: *mut bindings::drm_gem_object,
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::<<<U as IntoGEMObject>::Driver as drm::Driver>::File>::from_raw(raw_file)
- };
+ let file = unsafe { DriverFile::<T>::from_raw(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>`.
- let obj = unsafe {
- <<<U as IntoGEMObject>::Driver as drm::Driver>::Object as IntoGEMObject>::from_raw(raw_obj)
- };
+ let obj = unsafe { <<T::Driver as drm::Driver>::Object as IntoGEMObject>::from_raw(raw_obj) };
T::close(obj, file);
}
impl<T: DriverObject> IntoGEMObject for Object<T> {
- type Driver = T::Driver;
-
fn as_raw(&self) -> *mut bindings::drm_gem_object {
self.obj.get()
}
@@ -142,10 +128,12 @@ pub trait BaseObject: IntoGEMObject {
/// 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 as IntoGEMObject>::Driver as drm::Driver>::File>,
- ) -> Result<u32> {
+ fn create_handle<D, F>(&self, file: &drm::File<F>) -> Result<u32>
+ where
+ Self: AllocImpl<Driver = D>,
+ D: drm::Driver<Object = Self, File = F>,
+ F: drm::file::DriverFile<Driver = D>,
+ {
let mut handle: u32 = 0;
// SAFETY: The arguments are all valid per the type invariants.
to_result(unsafe {
@@ -155,10 +143,12 @@ pub trait BaseObject: IntoGEMObject {
}
/// Looks up an object by its handle for a given `File`.
- fn lookup_handle(
- file: &drm::File<<<Self as IntoGEMObject>::Driver as drm::Driver>::File>,
- handle: u32,
- ) -> Result<ARef<Self>> {
+ fn lookup_handle<D, F>(file: &drm::File<F>, handle: u32) -> Result<ARef<Self>>
+ where
+ Self: AllocImpl<Driver = D>,
+ D: drm::Driver<Object = Self, File = F>,
+ F: drm::file::DriverFile<Driver = D>,
+ {
// SAFETY: The arguments are all valid per the type invariants.
let ptr = unsafe { bindings::drm_gem_object_lookup(file.as_raw().cast(), handle) };
if ptr.is_null() {
@@ -208,13 +198,10 @@ pub struct Object<T: DriverObject + Send + Sync> {
}
impl<T: DriverObject> Object<T> {
- /// The size of this object's structure.
- pub const SIZE: usize = mem::size_of::<Self>();
-
const OBJECT_FUNCS: bindings::drm_gem_object_funcs = bindings::drm_gem_object_funcs {
free: Some(Self::free_callback),
- open: Some(open_callback::<T, Object<T>>),
- close: Some(close_callback::<T, Object<T>>),
+ open: Some(open_callback::<T>),
+ close: Some(close_callback::<T>),
print_info: None,
export: None,
pin: None,
@@ -297,6 +284,8 @@ impl<T: DriverObject> Deref for Object<T> {
}
impl<T: DriverObject> AllocImpl for Object<T> {
+ type Driver = T::Driver;
+
const ALLOC_OPS: AllocOps = AllocOps {
gem_create_object: None,
prime_handle_to_fd: None,
generated by cgit v1.2.3 (git 2.39.1) at 2025-09-29 15:18:14 +0000