[PATCH v3 07/13] drm/tyr: add shmem backing for GEM objects

[Deborah Brouwer]

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@xxxxxxxxxxxxx>
Signed-off-by: Boris Brezillon <boris.brezillon@xxxxxxxxxxxxx>
Signed-off-by: Deborah Brouwer <deborah.brouwer@xxxxxxxxxxxxx>
---
 drivers/gpu/drm/tyr/gem.rs | 22 +++++++++++++++++-----
 1 file changed, 17 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/tyr/gem.rs b/drivers/gpu/drm/tyr/gem.rs
index 11951b507b18..c6d4d6f9bae3 100644
--- 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::{
@@ -13,19 +17,27 @@
     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<Ctx: DeviceContext>(
         _dev: &TyrDrmDevice<Ctx>,
         _size: usize,
-        _args: Self::Args,
+        args: BoCreateArgs,
     ) -> impl PinInit<Self, Error> {
-        try_pin_init!(BoData {})
+        try_pin_init!(Self { flags: args.flags })
     }
 }

-- 
2.53.0