[PATCH v2 6/9] drm/tyr: add BO creation and lookup helpers

[Ke Sun via B4 Relay]

From: Alvin Sun <alvin....@linux.dev>

Add helpers for the BO ioctls: new_object() creates a GEM object with
the size aligned up to PAGE_SIZE, and lookup_handle() resolves a handle
for a DRM file.

Signed-off-by: Alvin Sun <alvin....@linux.dev>
---
 drivers/gpu/drm/tyr/gem.rs | 31 ++++++++++++++++++++++++++++++-
 1 file changed, 30 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/tyr/gem.rs b/drivers/gpu/drm/tyr/gem.rs
index 3bf3787f5c3fd..0e0989a48678f 100644
--- a/drivers/gpu/drm/tyr/gem.rs
+++ b/drivers/gpu/drm/tyr/gem.rs
@@ -9,8 +9,10 @@
 use kernel::{
     drm::gem::{
         self,
-        shmem, //
+        shmem,
+        BaseObject, //
     },
+    page::PAGE_SIZE,
     prelude::*,
     sync::{
         aref::ARef,
@@ -23,6 +25,7 @@
         TyrDrmDevice,
         TyrDrmDriver, //
     },
+    file::TyrDrmFile,
     vm::{
         Vm,
         VmMapFlags, //
@@ -53,6 +56,32 @@ fn new(_dev: &TyrDrmDevice, _size: usize, args: 
BoCreateArgs) -> impl PinInit<Se
 /// Type alias for Tyr GEM buffer objects.
 pub(crate) type Bo = gem::shmem::Object<BoData>;
 
+/// Create a new GEM buffer object.
+#[expect(dead_code)]
+pub(crate) fn new_object(ddev: &TyrDrmDevice, size: usize, flags: u32) -> 
Result<ARef<Bo>> {
+    if size == 0 {
+        return Err(EINVAL);
+    }
+
+    let aligned_size = size.checked_next_multiple_of(PAGE_SIZE).ok_or(EINVAL)?;
+
+    Bo::new(
+        ddev,
+        aligned_size,
+        shmem::ObjectConfig {
+            map_wc: true,
+            parent_resv_obj: None,
+        },
+        BoCreateArgs { flags },
+    )
+}
+
+/// Look up a GEM object by handle for a DRM file.
+#[expect(dead_code)]
+pub(crate) fn lookup_handle(file: &TyrDrmFile, handle: u32) -> 
Result<ARef<Bo>> {
+    Bo::lookup_handle(file, handle)
+}
+
 /// Creates a dummy GEM object to serve as the root of a GPUVM.
 pub(crate) fn new_dummy_object(ddev: &TyrDrmDevice) -> Result<ARef<Bo>> {
     let bo = Bo::new(

-- 
2.43.0