linux-kernel - [PATCH v2 3/3] drm/gpuvm: use const for drm_gpuva_op

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Message-ID: <20260108-gpuvm-rust-v2-3-dbd014005a0b@google.com>
Date: Thu, 08 Jan 2026 16:07:33 +0000
From: Alice Ryhl <aliceryhl@...gle.com>
To: Danilo Krummrich <dakr@...nel.org>, Daniel Almeida <daniel.almeida@...labora.com>
Cc: Matthew Brost <matthew.brost@...el.com>, 
	"Thomas Hellström" <thomas.hellstrom@...ux.intel.com>, 
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, Maxime Ripard <mripard@...nel.org>, 
	Thomas Zimmermann <tzimmermann@...e.de>, David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>, 
	Boris Brezillon <boris.brezillon@...labora.com>, Steven Price <steven.price@....com>, 
	Liviu Dudau <liviu.dudau@....com>, Miguel Ojeda <ojeda@...nel.org>, 
	Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>, 
	"Björn Roy Baron" <bjorn3_gh@...tonmail.com>, Benno Lossin <lossin@...nel.org>, 
	Andreas Hindborg <a.hindborg@...nel.org>, Trevor Gross <tmgross@...ch.edu>, 
	Frank Binns <frank.binns@...tec.com>, Matt Coster <matt.coster@...tec.com>, 
	Rob Clark <robin.clark@....qualcomm.com>, Dmitry Baryshkov <lumag@...nel.org>, 
	Abhinav Kumar <abhinav.kumar@...ux.dev>, Sean Paul <sean@...rly.run>, 
	Marijn Suijten <marijn.suijten@...ainline.org>, Lyude Paul <lyude@...hat.com>, 
	Rodrigo Vivi <rodrigo.vivi@...el.com>, Sumit Semwal <sumit.semwal@...aro.org>, 
	"Christian König" <christian.koenig@....com>, dri-devel@...ts.freedesktop.org, 
	linux-kernel@...r.kernel.org, rust-for-linux@...r.kernel.org, 
	linux-arm-msm@...r.kernel.org, freedreno@...ts.freedesktop.org, 
	nouveau@...ts.freedesktop.org, intel-xe@...ts.freedesktop.org, 
	linux-media@...r.kernel.org, Alice Ryhl <aliceryhl@...gle.com>
Subject: [PATCH v2 3/3] drm/gpuvm: use const for drm_gpuva_op_* ptrs

These methods just read the values stored in the op pointers without
modifying them, so it is appropriate to use const ptrs here.

This allows us to avoid const -> mut pointer casts in Rust.

Reviewed-by: Boris Brezillon <boris.brezillon@...labora.com>
Signed-off-by: Alice Ryhl <aliceryhl@...gle.com>
---
 drivers/gpu/drm/drm_gpuvm.c | 6 +++---
 include/drm/drm_gpuvm.h     | 8 ++++----
 2 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/drm_gpuvm.c b/drivers/gpu/drm/drm_gpuvm.c
index 37f0d97f653466285f036a5bf0246a5fea0234cd..6dfa9a3a90c17083d8c119c3b9509519c83e8d8b 100644
--- a/drivers/gpu/drm/drm_gpuvm.c
+++ b/drivers/gpu/drm/drm_gpuvm.c
@@ -2295,7 +2295,7 @@ EXPORT_SYMBOL_GPL(drm_gpuvm_interval_empty);
 void
 drm_gpuva_map(struct drm_gpuvm *gpuvm,
 	      struct drm_gpuva *va,
-	      struct drm_gpuva_op_map *op)
+	      const struct drm_gpuva_op_map *op)
 {
 	drm_gpuva_init_from_op(va, op);
 	drm_gpuva_insert(gpuvm, va);
@@ -2315,7 +2315,7 @@ EXPORT_SYMBOL_GPL(drm_gpuva_map);
 void
 drm_gpuva_remap(struct drm_gpuva *prev,
 		struct drm_gpuva *next,
-		struct drm_gpuva_op_remap *op)
+		const struct drm_gpuva_op_remap *op)
 {
 	struct drm_gpuva *va = op->unmap->va;
 	struct drm_gpuvm *gpuvm = va->vm;
@@ -2342,7 +2342,7 @@ EXPORT_SYMBOL_GPL(drm_gpuva_remap);
  * Removes the &drm_gpuva associated with the &drm_gpuva_op_unmap.
  */
 void
-drm_gpuva_unmap(struct drm_gpuva_op_unmap *op)
+drm_gpuva_unmap(const struct drm_gpuva_op_unmap *op)
 {
 	drm_gpuva_remove(op->va);
 }
diff --git a/include/drm/drm_gpuvm.h b/include/drm/drm_gpuvm.h
index 0d3fc1f6cac9966a42f3bc82b0b491bfefaf5b96..655bd9104ffb24170fca14dfa034ee79f5400930 100644
--- a/include/drm/drm_gpuvm.h
+++ b/include/drm/drm_gpuvm.h
@@ -1121,7 +1121,7 @@ void drm_gpuva_ops_free(struct drm_gpuvm *gpuvm,
 			struct drm_gpuva_ops *ops);
 
 static inline void drm_gpuva_init_from_op(struct drm_gpuva *va,
-					  struct drm_gpuva_op_map *op)
+					  const struct drm_gpuva_op_map *op)
 {
 	va->va.addr = op->va.addr;
 	va->va.range = op->va.range;
@@ -1265,13 +1265,13 @@ int drm_gpuvm_sm_unmap_exec_lock(struct drm_gpuvm *gpuvm, struct drm_exec *exec,
 
 void drm_gpuva_map(struct drm_gpuvm *gpuvm,
 		   struct drm_gpuva *va,
-		   struct drm_gpuva_op_map *op);
+		   const struct drm_gpuva_op_map *op);
 
 void drm_gpuva_remap(struct drm_gpuva *prev,
 		     struct drm_gpuva *next,
-		     struct drm_gpuva_op_remap *op);
+		     const struct drm_gpuva_op_remap *op);
 
-void drm_gpuva_unmap(struct drm_gpuva_op_unmap *op);
+void drm_gpuva_unmap(const struct drm_gpuva_op_unmap *op);
 
 /**
  * drm_gpuva_op_remap_to_unmap_range() - Helper to get the start and range of

-- 
2.52.0.351.gbe84eed79e-goog