drm/tyr: add shmem backing for GEM objects

Add support for GEM buffer objects backed by shared memory.

This introduces the BoCreateArgs structure for passing creation parameters
including flags, and adds a flags field to BoData.

Co-developed-by: Boris Brezillon <boris.brezillon@collabora.com>
Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Signed-off-by: Deborah Brouwer <deborah.brouwer@collabora.com>
Link: https://patch.msgid.link/20260428-fw-boot-prerequisites-v1-5-c69af9abe1af@collabora.com
Signed-off-by: Alice Ryhl <aliceryhl@google.com>

diff --git a/drivers/gpu/drm/tyr/gem.rs b/drivers/gpu/drm/tyr/gem.rs
index 66c427a16c315cd763fd51bf794b7c2a48ac5ad3..1640a161754b26be062d17aaa46434b1fa8e71d6 100644 (file)
--- a/drivers/gpu/drm/tyr/gem.rs
+++ b/drivers/gpu/drm/tyr/gem.rs
@@ -1,4 +1,8 @@
 // SPDX-License-Identifier: GPL-2.0 or MIT
+//! GEM buffer object management for the Tyr driver.
+//!
+//! This module provides buffer object (BO) management functionality using
+//! DRM's GEM subsystem with shmem backing.
 
 use kernel::{
     drm::gem,
@@ -10,15 +14,23 @@ use crate::driver::{
     TyrDrmDriver, //
 };
 
-/// GEM Object inner driver data
+/// Tyr's DriverObject type for GEM objects.
 #[pin_data]
-pub(crate) struct BoData {}
+pub(crate) struct BoData {
+    flags: u32,
+}
+
+/// Provides a way to pass arguments when creating BoData
+/// as required by the gem::DriverObject trait.
+pub(crate) struct BoCreateArgs {
+    flags: u32,
+}
 
 impl gem::DriverObject for BoData {
     type Driver = TyrDrmDriver;
-    type Args = ();
+    type Args = BoCreateArgs;
 
-    fn new(_dev: &TyrDrmDevice, _size: usize, _args: ()) -> impl PinInit<Self, Error> {
-        try_pin_init!(BoData {})
+    fn new(_dev: &TyrDrmDevice, _size: usize, args: BoCreateArgs) -> impl PinInit<Self, Error> {
+        try_pin_init!(Self { flags: args.flags })
     }
 }