diff mbox series

[RFC,PATCHv2,09/12] videobuf2: let user-space know if driver supports cache hints

Message ID 20200204025641.218376-10-senozhatsky@chromium.org (mailing list archive)
State New, archived
Headers show
Series Implement V4L2_BUF_FLAG_NO_CACHE_* flags | expand

Commit Message

Sergey Senozhatsky Feb. 4, 2020, 2:56 a.m. UTC 
Add V4L2_BUF_CAP_SUPPORTS_CACHE_HINTS to fill_buf_caps(), which
is set when queue supports user-space cache management hints.

Change-Id: Ieac93f3726c61fd3b88e02c36980c1f3c7a82ecc
Signed-off-by: Sergey Senozhatsky <senozhatsky@chromium.org>
---
 Documentation/media/uapi/v4l/vidioc-reqbufs.rst | 7 +++++++
 drivers/media/common/videobuf2/videobuf2-v4l2.c | 2 ++
 include/uapi/linux/videodev2.h                  | 1 +
 3 files changed, 10 insertions(+)

Comments

Hans Verkuil Feb. 19, 2020, 8:33 a.m. UTC | #1 
On 2/4/20 3:56 AM, Sergey Senozhatsky wrote:
> Add V4L2_BUF_CAP_SUPPORTS_CACHE_HINTS to fill_buf_caps(), which
> is set when queue supports user-space cache management hints.

Ah, you add the capability here :-)

This should be moved forward in the series. Actually, I think this should
be merged with the first patch of the series.

Regards,

	Hans

> 
> Change-Id: Ieac93f3726c61fd3b88e02c36980c1f3c7a82ecc
> Signed-off-by: Sergey Senozhatsky <senozhatsky@chromium.org>
> ---
>  Documentation/media/uapi/v4l/vidioc-reqbufs.rst | 7 +++++++
>  drivers/media/common/videobuf2/videobuf2-v4l2.c | 2 ++
>  include/uapi/linux/videodev2.h                  | 1 +
>  3 files changed, 10 insertions(+)
> 
> diff --git a/Documentation/media/uapi/v4l/vidioc-reqbufs.rst b/Documentation/media/uapi/v4l/vidioc-reqbufs.rst
> index 9741dac0d5b3..80603f57eb8a 100644
> --- a/Documentation/media/uapi/v4l/vidioc-reqbufs.rst
> +++ b/Documentation/media/uapi/v4l/vidioc-reqbufs.rst
> @@ -165,6 +165,13 @@ aborting or finishing any DMA in progress, an implicit
>        - Only valid for stateless decoders. If set, then userspace can set the
>          ``V4L2_BUF_FLAG_M2M_HOLD_CAPTURE_BUF`` flag to hold off on returning the
>  	capture buffer until the OUTPUT timestamp changes.
> +    * - ``V4L2_BUF_CAP_SUPPORTS_CACHE_HINTS``
> +      - 0x00000040
> +      - Set when the queue/buffer support memory consistency and cache
> +        management hints. See :ref:`V4L2_FLAG_MEMORY_NON_CONSISTENT`,
> +        :ref:`V4L2_BUF_FLAG_NO_CACHE_INVALIDATE` and
> +        :ref:`V4L2_BUF_FLAG_NO_CACHE_CLEAN`.
> +
>  
>  Return Value
>  ============
> diff --git a/drivers/media/common/videobuf2/videobuf2-v4l2.c b/drivers/media/common/videobuf2/videobuf2-v4l2.c
> index eb5d1306cb03..22ae0ff64684 100644
> --- a/drivers/media/common/videobuf2/videobuf2-v4l2.c
> +++ b/drivers/media/common/videobuf2/videobuf2-v4l2.c
> @@ -698,6 +698,8 @@ static void fill_buf_caps(struct vb2_queue *q, u32 *caps)
>  		*caps |= V4L2_BUF_CAP_SUPPORTS_DMABUF;
>  	if (q->subsystem_flags & VB2_V4L2_FL_SUPPORTS_M2M_HOLD_CAPTURE_BUF)
>  		*caps |= V4L2_BUF_CAP_SUPPORTS_M2M_HOLD_CAPTURE_BUF;
> +	if (q->allow_cache_hints)
> +		*caps |= V4L2_BUF_CAP_SUPPORTS_CACHE_HINTS;
>  #ifdef CONFIG_MEDIA_CONTROLLER_REQUEST_API
>  	if (q->supports_requests)
>  		*caps |= V4L2_BUF_CAP_SUPPORTS_REQUESTS;
> diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
> index 169a8cf345ed..12b1bd220347 100644
> --- a/include/uapi/linux/videodev2.h
> +++ b/include/uapi/linux/videodev2.h
> @@ -951,6 +951,7 @@ struct v4l2_requestbuffers {
>  #define V4L2_BUF_CAP_SUPPORTS_REQUESTS			(1 << 3)
>  #define V4L2_BUF_CAP_SUPPORTS_ORPHANED_BUFS		(1 << 4)
>  #define V4L2_BUF_CAP_SUPPORTS_M2M_HOLD_CAPTURE_BUF	(1 << 5)
> +#define V4L2_BUF_CAP_SUPPORTS_CACHE_HINTS		(1 << 6)
>  
>  /**
>   * struct v4l2_plane - plane info for multi-planar buffers
>
Sergey Senozhatsky Feb. 19, 2020, 8:45 a.m. UTC | #2 
On (20/02/19 09:33), Hans Verkuil wrote:
> On 2/4/20 3:56 AM, Sergey Senozhatsky wrote:
> > Add V4L2_BUF_CAP_SUPPORTS_CACHE_HINTS to fill_buf_caps(), which
> > is set when queue supports user-space cache management hints.
> 
> Ah, you add the capability here :-)
> 
> This should be moved forward in the series. Actually, I think this should
> be merged with the first patch of the series.

OK, can squash. This way I don't have to split 03/12.

I can also update V4L2_BUF_FLAG_NO_CACHE_INVALIDATE/CLEAN in 01/12 then.
Would that work?

	-ss
Hans Verkuil Feb. 19, 2020, 8:56 a.m. UTC | #3 
On 2/19/20 9:45 AM, Sergey Senozhatsky wrote:
> On (20/02/19 09:33), Hans Verkuil wrote:
>> On 2/4/20 3:56 AM, Sergey Senozhatsky wrote:
>>> Add V4L2_BUF_CAP_SUPPORTS_CACHE_HINTS to fill_buf_caps(), which
>>> is set when queue supports user-space cache management hints.
>>
>> Ah, you add the capability here :-)
>>
>> This should be moved forward in the series. Actually, I think this should
>> be merged with the first patch of the series.
> 
> OK, can squash. This way I don't have to split 03/12.
> 
> I can also update V4L2_BUF_FLAG_NO_CACHE_INVALIDATE/CLEAN in 01/12 then.
> Would that work?

Yes, that makes sense.

	Hans

> 
> 	-ss
>
diff mbox series

Patch

diff --git a/Documentation/media/uapi/v4l/vidioc-reqbufs.rst b/Documentation/media/uapi/v4l/vidioc-reqbufs.rst
index 9741dac0d5b3..80603f57eb8a 100644
--- a/Documentation/media/uapi/v4l/vidioc-reqbufs.rst
+++ b/Documentation/media/uapi/v4l/vidioc-reqbufs.rst
@@ -165,6 +165,13 @@  aborting or finishing any DMA in progress, an implicit
       - Only valid for stateless decoders. If set, then userspace can set the
         ``V4L2_BUF_FLAG_M2M_HOLD_CAPTURE_BUF`` flag to hold off on returning the
 	capture buffer until the OUTPUT timestamp changes.
+    * - ``V4L2_BUF_CAP_SUPPORTS_CACHE_HINTS``
+      - 0x00000040
+      - Set when the queue/buffer support memory consistency and cache
+        management hints. See :ref:`V4L2_FLAG_MEMORY_NON_CONSISTENT`,
+        :ref:`V4L2_BUF_FLAG_NO_CACHE_INVALIDATE` and
+        :ref:`V4L2_BUF_FLAG_NO_CACHE_CLEAN`.
+
 
 Return Value
 ============
diff --git a/drivers/media/common/videobuf2/videobuf2-v4l2.c b/drivers/media/common/videobuf2/videobuf2-v4l2.c
index eb5d1306cb03..22ae0ff64684 100644
--- a/drivers/media/common/videobuf2/videobuf2-v4l2.c
+++ b/drivers/media/common/videobuf2/videobuf2-v4l2.c
@@ -698,6 +698,8 @@  static void fill_buf_caps(struct vb2_queue *q, u32 *caps)
 		*caps |= V4L2_BUF_CAP_SUPPORTS_DMABUF;
 	if (q->subsystem_flags & VB2_V4L2_FL_SUPPORTS_M2M_HOLD_CAPTURE_BUF)
 		*caps |= V4L2_BUF_CAP_SUPPORTS_M2M_HOLD_CAPTURE_BUF;
+	if (q->allow_cache_hints)
+		*caps |= V4L2_BUF_CAP_SUPPORTS_CACHE_HINTS;
 #ifdef CONFIG_MEDIA_CONTROLLER_REQUEST_API
 	if (q->supports_requests)
 		*caps |= V4L2_BUF_CAP_SUPPORTS_REQUESTS;
diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
index 169a8cf345ed..12b1bd220347 100644
--- a/include/uapi/linux/videodev2.h
+++ b/include/uapi/linux/videodev2.h
@@ -951,6 +951,7 @@  struct v4l2_requestbuffers {
 #define V4L2_BUF_CAP_SUPPORTS_REQUESTS			(1 << 3)
 #define V4L2_BUF_CAP_SUPPORTS_ORPHANED_BUFS		(1 << 4)
 #define V4L2_BUF_CAP_SUPPORTS_M2M_HOLD_CAPTURE_BUF	(1 << 5)
+#define V4L2_BUF_CAP_SUPPORTS_CACHE_HINTS		(1 << 6)
 
 /**
  * struct v4l2_plane - plane info for multi-planar buffers