Re: [PATCH v3 1/2] media: v4l2-subdev: Provide const-aware subdev state accessors

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On 08/05/2024 21:44, Sakari Ailus wrote:
Hi Laurent,

Thanks for the update.

This is starting to look very nice. A few comments below...

On Tue, May 07, 2024 at 07:19:06PM +0300, Laurent Pinchart wrote:
It would be useful to mark instances of v4l2_subdev_state structures as
const when code needs to access them read-only. This isn't currently
possible, as the v4l2_subdev_state_get_*() accessor functions take a
non-const pointer to the state.

Use _Generic() to provide two different versions of the accessors, for
const and non-const states respectively. The former returns a const
pointer to the requested format, rectangle or interval, implementing
const-correctness. The latter returns a non-const pointer, preserving
the current behaviour for drivers.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@xxxxxxxxxxxxxxxx>
---
Changes since v2:

- Specify types explicitly in _Generic() expression
- Fix cast of value to const pointer

Changes since v1:

- Wrap the accessors with _Generic() using a single macro instead of
   adding a _Generic() statement in each of them.
---
  include/media/v4l2-subdev.h | 40 +++++++++++++++++++++++++------------
  1 file changed, 27 insertions(+), 13 deletions(-)

diff --git a/include/media/v4l2-subdev.h b/include/media/v4l2-subdev.h
index e30c463d90e5..cd3e9e2ebe4d 100644
--- a/include/media/v4l2-subdev.h
+++ b/include/media/v4l2-subdev.h
@@ -1326,6 +1326,16 @@ void v4l2_subdev_cleanup(struct v4l2_subdev *sd);
  #define __v4l2_subdev_state_gen_call(NAME, _1, ARG, ...)	\
  	__v4l2_subdev_state_get_ ## NAME ## ARG
+/*
+ * A macro to constify the return value of the state accessors when the state
+ * parameter is const.
+ */
+#define __v4l2_subdev_state_constify_call(state, value)				\

This function just changes the return value constness. How about calling it
e.g. __v4l2_subdev_state_constify_ret instead?

Either way,

Reviewed-by: Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx>

I tested this today on my branches, but apparently forgot to send the R-b. So here's mine also:

Reviewed-by: Tomi Valkeinen <tomi.valkeinen@xxxxxxxxxxxxxxxx>

 Tomi

+	_Generic(state,								\
+		const struct v4l2_subdev_state *: (const typeof(*(value)) *)(value), \
+		struct v4l2_subdev_state *: (value)				\
+	)
+
  /**
   * v4l2_subdev_state_get_format() - Get pointer to a stream format
   * @state: subdevice state
@@ -1340,16 +1350,17 @@ void v4l2_subdev_cleanup(struct v4l2_subdev *sd);
   */
  /*
   * Wrap v4l2_subdev_state_get_format(), allowing the function to be called with
- * two or three arguments. The purpose of the __v4l2_subdev_state_get_format()
+ * two or three arguments. The purpose of the __v4l2_subdev_state_gen_call()
   * macro below is to come up with the name of the function or macro to call,
   * using the last two arguments (_stream and _pad). The selected function or
   * macro is then called using the arguments specified by the caller. A similar
   * arrangement is used for v4l2_subdev_state_crop() and
   * v4l2_subdev_state_compose() below.

These function names are missing _get after the prefix.

Could you also add the interval function here, too?

The would fit well for a separate patch.

   */
-#define v4l2_subdev_state_get_format(state, pad, ...)			\
-	__v4l2_subdev_state_gen_call(format, ##__VA_ARGS__, , _pad)	\
-		(state, pad, ##__VA_ARGS__)
+#define v4l2_subdev_state_get_format(state, pad, ...)				\
+	__v4l2_subdev_state_constify_call(state,				\
+		__v4l2_subdev_state_gen_call(format, ##__VA_ARGS__, , _pad)	\
+			((struct v4l2_subdev_state *)state, pad, ##__VA_ARGS__))
  #define __v4l2_subdev_state_get_format_pad(state, pad)	\
  	__v4l2_subdev_state_get_format(state, pad, 0)
  struct v4l2_mbus_framefmt *
@@ -1368,9 +1379,10 @@ __v4l2_subdev_state_get_format(struct v4l2_subdev_state *state,
   * For stream-unaware drivers the crop rectangle for the corresponding pad is
   * returned. If the pad does not exist, NULL is returned.
   */
-#define v4l2_subdev_state_get_crop(state, pad, ...)			\
-	__v4l2_subdev_state_gen_call(crop, ##__VA_ARGS__, , _pad)	\
-		(state, pad, ##__VA_ARGS__)
+#define v4l2_subdev_state_get_crop(state, pad, ...)				\
+	__v4l2_subdev_state_constify_call(state,				\
+		__v4l2_subdev_state_gen_call(crop, ##__VA_ARGS__, , _pad)	\
+			((struct v4l2_subdev_state *)state, pad, ##__VA_ARGS__))
  #define __v4l2_subdev_state_get_crop_pad(state, pad)	\
  	__v4l2_subdev_state_get_crop(state, pad, 0)
  struct v4l2_rect *
@@ -1389,9 +1401,10 @@ __v4l2_subdev_state_get_crop(struct v4l2_subdev_state *state, unsigned int pad,
   * For stream-unaware drivers the compose rectangle for the corresponding pad is
   * returned. If the pad does not exist, NULL is returned.
   */
-#define v4l2_subdev_state_get_compose(state, pad, ...)			\
-	__v4l2_subdev_state_gen_call(compose, ##__VA_ARGS__, , _pad)	\
-		(state, pad, ##__VA_ARGS__)
+#define v4l2_subdev_state_get_compose(state, pad, ...)				\
+	__v4l2_subdev_state_constify_call(state,				\
+		__v4l2_subdev_state_gen_call(compose, ##__VA_ARGS__, , _pad)	\
+			((struct v4l2_subdev_state *)state, pad, ##__VA_ARGS__))
  #define __v4l2_subdev_state_get_compose_pad(state, pad)	\
  	__v4l2_subdev_state_get_compose(state, pad, 0)
  struct v4l2_rect *
@@ -1410,9 +1423,10 @@ __v4l2_subdev_state_get_compose(struct v4l2_subdev_state *state,
   * For stream-unaware drivers the frame interval for the corresponding pad is
   * returned. If the pad does not exist, NULL is returned.
   */
-#define v4l2_subdev_state_get_interval(state, pad, ...)			\
-	__v4l2_subdev_state_gen_call(interval, ##__VA_ARGS__, , _pad)	\
-		(state, pad, ##__VA_ARGS__)
+#define v4l2_subdev_state_get_interval(state, pad, ...)				\
+	__v4l2_subdev_state_constify_call(state,				\
+		__v4l2_subdev_state_gen_call(interval, ##__VA_ARGS__, , _pad)	\
+			((struct v4l2_subdev_state *)state, pad, ##__VA_ARGS__))
  #define __v4l2_subdev_state_get_interval_pad(state, pad)	\
  	__v4l2_subdev_state_get_interval(state, pad, 0)
  struct v4l2_fract *






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