[RFC v2 07/21] videodev2.h: Add request field to v4l2_buffer

[Sakari Ailus <sakari.ailus@linux.intel.com>]

From: Hans Verkuil <hans.verkuil@cisco.com>

When queuing buffers allow for passing the request ID that
should be associated with this buffer. Split the u32 reserved2 field
into two u16 fields, one for request, one with the old reserved2 name.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>

Use full 32 bits for the request ID.

Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
---
 drivers/media/usb/cpia2/cpia2_v4l.c           | 1 +
 drivers/media/v4l2-core/v4l2-compat-ioctl32.c | 7 ++++---
 drivers/media/v4l2-core/v4l2-ioctl.c          | 4 ++--
 drivers/media/v4l2-core/videobuf2-v4l2.c      | 3 ++-
 include/media/videobuf2-v4l2.h                | 2 ++
 include/uapi/linux/videodev2.h                | 3 ++-
 6 files changed, 13 insertions(+), 7 deletions(-)

diff --git a/drivers/media/usb/cpia2/cpia2_v4l.c b/drivers/media/usb/cpia2/cpia2_v4l.c
index 9caea83..01c596a 100644
--- a/drivers/media/usb/cpia2/cpia2_v4l.c
+++ b/drivers/media/usb/cpia2/cpia2_v4l.c
@@ -952,6 +952,7 @@ static int cpia2_dqbuf(struct file *file, void *fh, struct v4l2_buffer *buf)
 	buf->sequence = cam->buffers[buf->index].seq;
 	buf->m.offset = cam->buffers[buf->index].data - cam->frame_buffer;
 	buf->length = cam->frame_size;
+	buf->request = 0;
 	buf->reserved2 = 0;
 	buf->reserved = 0;
 	memset(&buf->timecode, 0, sizeof(buf->timecode));
diff --git a/drivers/media/v4l2-core/v4l2-compat-ioctl32.c b/drivers/media/v4l2-core/v4l2-compat-ioctl32.c
index bacecbd..3a74114 100644
--- a/drivers/media/v4l2-core/v4l2-compat-ioctl32.c
+++ b/drivers/media/v4l2-core/v4l2-compat-ioctl32.c
@@ -348,7 +348,7 @@ struct v4l2_buffer32 {
 		__s32		fd;
 	} m;
 	__u32			length;
-	__u32			reserved2;
+	__u32			request;
 	__u32			reserved;
 };
 
@@ -417,7 +417,8 @@ static int get_v4l2_buffer32(struct v4l2_buffer *kp, struct v4l2_buffer32 __user
 		get_user(kp->type, &up->type) ||
 		get_user(kp->flags, &up->flags) ||
 		get_user(kp->memory, &up->memory) ||
-		get_user(kp->length, &up->length))
+		get_user(kp->length, &up->length) ||
+		get_user(kp->request, &up->request))
 			return -EFAULT;
 
 	if (V4L2_TYPE_IS_OUTPUT(kp->type))
@@ -509,7 +510,7 @@ static int put_v4l2_buffer32(struct v4l2_buffer *kp, struct v4l2_buffer32 __user
 		put_user(kp->timestamp.tv_usec, &up->timestamp.tv_usec) ||
 		copy_to_user(&up->timecode, &kp->timecode, sizeof(struct v4l2_timecode)) ||
 		put_user(kp->sequence, &up->sequence) ||
-		put_user(kp->reserved2, &up->reserved2) ||
+		put_user(kp->request, &up->request) ||
 		put_user(kp->reserved, &up->reserved) ||
 		put_user(kp->length, &up->length))
 			return -EFAULT;
diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c
index 6bf5a3e..bf15580 100644
--- a/drivers/media/v4l2-core/v4l2-ioctl.c
+++ b/drivers/media/v4l2-core/v4l2-ioctl.c
@@ -443,13 +443,13 @@ static void v4l_print_buffer(const void *arg, bool write_only)
 	int i;
 
 	pr_cont("%02ld:%02d:%02d.%08ld index=%d, type=%s, "
-		"flags=0x%08x, field=%s, sequence=%d, memory=%s",
+		"request %u, flags=0x%08x, field=%s, sequence=%d, memory=%s",
 			p->timestamp.tv_sec / 3600,
 			(int)(p->timestamp.tv_sec / 60) % 60,
 			(int)(p->timestamp.tv_sec % 60),
 			(long)p->timestamp.tv_usec,
 			p->index,
-			prt_names(p->type, v4l2_type_names),
+			prt_names(p->type, v4l2_type_names), p->request,
 			p->flags, prt_names(p->field, v4l2_field_names),
 			p->sequence, prt_names(p->memory, v4l2_memory_names));
 
diff --git a/drivers/media/v4l2-core/videobuf2-v4l2.c b/drivers/media/v4l2-core/videobuf2-v4l2.c
index 91f5521..0721258 100644
--- a/drivers/media/v4l2-core/videobuf2-v4l2.c
+++ b/drivers/media/v4l2-core/videobuf2-v4l2.c
@@ -199,7 +199,7 @@ static void __fill_v4l2_buffer(struct vb2_buffer *vb, void *pb)
 	b->timestamp = ns_to_timeval(vb->timestamp);
 	b->timecode = vbuf->timecode;
 	b->sequence = vbuf->sequence;
-	b->reserved2 = 0;
+	b->request = vbuf->request;
 	b->reserved = 0;
 
 	if (q->is_multiplanar) {
@@ -317,6 +317,7 @@ static int __fill_vb2_buffer(struct vb2_buffer *vb,
 	}
 	vb->timestamp = 0;
 	vbuf->sequence = 0;
+	vbuf->request = b->request;
 
 	if (V4L2_TYPE_IS_MULTIPLANAR(b->type)) {
 		if (b->memory == VB2_MEMORY_USERPTR) {
diff --git a/include/media/videobuf2-v4l2.h b/include/media/videobuf2-v4l2.h
index 3cc836f..b1ee91c 100644
--- a/include/media/videobuf2-v4l2.h
+++ b/include/media/videobuf2-v4l2.h
@@ -30,6 +30,7 @@
  * @field:	enum v4l2_field; field order of the image in the buffer
  * @timecode:	frame timecode
  * @sequence:	sequence count of this frame
+ * @request:	request used by the buffer
  * Should contain enough information to be able to cover all the fields
  * of struct v4l2_buffer at videodev2.h
  */
@@ -40,6 +41,7 @@ struct vb2_v4l2_buffer {
 	__u32			field;
 	struct v4l2_timecode	timecode;
 	__u32			sequence;
+	__u32			request;
 };
 
 /*
diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
index 8f95191..ac28299 100644
--- a/include/uapi/linux/videodev2.h
+++ b/include/uapi/linux/videodev2.h
@@ -846,6 +846,7 @@ struct v4l2_plane {
  * @length:	size in bytes of the buffer (NOT its payload) for single-plane
  *		buffers (when type != *_MPLANE); number of elements in the
  *		planes array for multi-plane buffers
+ * @request: this buffer should use this request
  *
  * Contains data exchanged by application and driver using one of the Streaming
  * I/O methods.
@@ -869,7 +870,7 @@ struct v4l2_buffer {
 		__s32		fd;
 	} m;
 	__u32			length;
-	__u32			reserved2;
+	__u32			request;
 	__u32			reserved;
 };
 
-- 
1.9.1