[RFC PATCH v6 04/11] media: videobuf2-v4l2: reorganize flags handling

Helen Koike
2021-01-14T18:10:17Z

Reorganize flags handling to be easily reuseble when Ext functions get
added.
No logic is changed, just moving around code.

- Two new functions:
v4l2_clear_buffer_flags()
vb2_fill_vb2_v4l2_buffer_flags()
- set_buffer_cache_hints() receives a pointer to flags instead of the
v4l2_buffer object, making it undependent of this struct.

Signed-off-by: Helen Koike <helen.koike@collabora.com>

---
Changes in v6:
- New patch
---
.../media/common/videobuf2/videobuf2-v4l2.c | 176 ++++++++++--------
1 file changed, 97 insertions(+), 79 deletions(-)

diff --git a/drivers/media/common/videobuf2/videobuf2-v4l2.c b/drivers/media/common/videobuf2/videobuf2-v4l2.c
index bb642c0775d1..aa4f17ec0982 100644
--- a/drivers/media/common/videobuf2/videobuf2-v4l2.c
+++ b/drivers/media/common/videobuf2/videobuf2-v4l2.c
@@ -174,6 +174,43 @@ static void vb2_warn_zero_bytesused(struct vb2_buffer *vb)
pr_warn("use the actual size instead.\n");
}

+static void
+vb2_fill_vb2_v4l2_buffer_flags(struct vb2_buffer *vb,
+ u32 type, u32 field, u32 flags)
+{
+ struct vb2_queue *q = vb->vb2_queue;
+ struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
+
+ /* Zero flags that we handle */
+ vbuf->flags = flags & ~V4L2_BUFFER_MASK_FLAGS;
+ if (!vb->vb2_queue->copy_timestamp || V4L2_TYPE_IS_CAPTURE(type)) {
+ /*
+ * Non-COPY timestamps and non-OUTPUT queues will get
+ * their timestamp and timestamp source flags from the
+ * queue.
+ */
+ vbuf->flags &= ~V4L2_BUF_FLAG_TSTAMP_SRC_MASK;
+ }
+
+ if (V4L2_TYPE_IS_OUTPUT(type)) {
+ /*
+ * For output buffers mask out the timecode flag:
+ * this will be handled later in vb2_qbuf().
+ * The 'field' is valid metadata for this output buffer
+ * and so that needs to be copied here.
+ */
+ vbuf->flags &= ~V4L2_BUF_FLAG_TIMECODE;
+ vbuf->field = field;
+ if (!(q->subsystem_flags & VB2_V4L2_FL_SUPPORTS_M2M_HOLD_CAPTURE_BUF))
+ vbuf->flags &= ~V4L2_BUF_FLAG_M2M_HOLD_CAPTURE_BUF;
+ } else {
+ /* Zero any output buffer flags as this is a capture buffer */
+ vbuf->flags &= ~V4L2_BUFFER_OUT_FLAGS;
+ /* Zero last flag, this is a signal from driver to userspace */
+ vbuf->flags &= ~V4L2_BUF_FLAG_LAST;
+ }
+}
+
static int vb2_fill_vb2_v4l2_buffer(struct vb2_buffer *vb, struct v4l2_buffer *b)
{
struct vb2_queue *q = vb->vb2_queue;
@@ -310,41 +347,14 @@ static int vb2_fill_vb2_v4l2_buffer(struct vb2_buffer *vb, struct v4l2_buffer *b

}

- /* Zero flags that we handle */
- vbuf->flags = b->flags & ~V4L2_BUFFER_MASK_FLAGS;
- if (!vb->vb2_queue->copy_timestamp || V4L2_TYPE_IS_CAPTURE(b->type)) {
- /*
- * Non-COPY timestamps and non-OUTPUT queues will get
- * their timestamp and timestamp source flags from the
- * queue.
- */
- vbuf->flags &= ~V4L2_BUF_FLAG_TSTAMP_SRC_MASK;
- }
-
- if (V4L2_TYPE_IS_OUTPUT(b->type)) {
- /*
- * For output buffers mask out the timecode flag:
- * this will be handled later in vb2_qbuf().
- * The 'field' is valid metadata for this output buffer
- * and so that needs to be copied here.
- */
- vbuf->flags &= ~V4L2_BUF_FLAG_TIMECODE;
- vbuf->field = b->field;
- if (!(q->subsystem_flags & VB2_V4L2_FL_SUPPORTS_M2M_HOLD_CAPTURE_BUF))
- vbuf->flags &= ~V4L2_BUF_FLAG_M2M_HOLD_CAPTURE_BUF;
- } else {
- /* Zero any output buffer flags as this is a capture buffer */
- vbuf->flags &= ~V4L2_BUFFER_OUT_FLAGS;
- /* Zero last flag, this is a signal from driver to userspace */
- vbuf->flags &= ~V4L2_BUF_FLAG_LAST;
- }
+ vb2_fill_vb2_v4l2_buffer_flags(vb, b->type, b->field, b->flags);

return 0;
}

static void set_buffer_cache_hints(struct vb2_queue *q,
struct vb2_buffer *vb,
- struct v4l2_buffer *b)
+ u32 *flags)
{
/*
* DMA exporter should take care of cache syncs, so we can avoid
@@ -370,8 +380,8 @@ static void set_buffer_cache_hints(struct vb2_queue *q,
* space hints. That's to indicate to userspace that these
* flags won't work.
*/
- b->flags &= ~V4L2_BUF_FLAG_NO_CACHE_INVALIDATE;
- b->flags &= ~V4L2_BUF_FLAG_NO_CACHE_CLEAN;
+ *flags &= ~V4L2_BUF_FLAG_NO_CACHE_INVALIDATE;
+ *flags &= ~V4L2_BUF_FLAG_NO_CACHE_CLEAN;
return;
}

@@ -382,10 +392,10 @@ static void set_buffer_cache_hints(struct vb2_queue *q,
if (q->dma_dir == DMA_TO_DEVICE)
vb->need_cache_sync_on_finish = 0;

- if (b->flags & V4L2_BUF_FLAG_NO_CACHE_INVALIDATE)
+ if (*flags & V4L2_BUF_FLAG_NO_CACHE_INVALIDATE)
vb->need_cache_sync_on_finish = 0;

- if (b->flags & V4L2_BUF_FLAG_NO_CACHE_CLEAN)
+ if (*flags & V4L2_BUF_FLAG_NO_CACHE_CLEAN)
vb->need_cache_sync_on_prepare = 0;
}

@@ -433,7 +443,7 @@ static int vb2_queue_or_prepare_buf(struct vb2_queue *q, struct media_device *md
}

if (!vb->prepared) {
- set_buffer_cache_hints(q, vb, b);
+ set_buffer_cache_hints(q, vb, &b->flags);
/* Copy relevant information provided by the userspace */
memset(vbuf->planes, 0,
sizeof(vbuf->planes[0]) * vb->num_planes);
@@ -511,6 +521,58 @@ static int vb2_queue_or_prepare_buf(struct vb2_queue *q, struct media_device *md
return 0;
}

+/*
+ * Clear any buffer state related flags.
+ */
+static void v4l2_clear_buffer_flags(struct vb2_buffer *vb, u32 *flags,
+ struct vb2_queue *q,
+ struct vb2_v4l2_buffer *vbuf,
+ u32* request_fd)
+{
+ *flags &= ~V4L2_BUFFER_MASK_FLAGS;
+ *flags |= q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK;
+ if (!q->copy_timestamp) {
+ /*
+ * For non-COPY timestamps, drop timestamp source bits
+ * and obtain the timestamp source from the queue.
+ */
+ *flags &= ~V4L2_BUF_FLAG_TSTAMP_SRC_MASK;
+ *flags |= q->timestamp_flags & V4L2_BUF_FLAG_TSTAMP_SRC_MASK;
+ }
+
+ switch (vb->state) {
+ case VB2_BUF_STATE_QUEUED:
+ case VB2_BUF_STATE_ACTIVE:
+ *flags |= V4L2_BUF_FLAG_QUEUED;
+ break;
+ case VB2_BUF_STATE_IN_REQUEST:
+ *flags |= V4L2_BUF_FLAG_IN_REQUEST;
+ break;
+ case VB2_BUF_STATE_ERROR:
+ *flags |= V4L2_BUF_FLAG_ERROR;
+ fallthrough;
+ case VB2_BUF_STATE_DONE:
+ *flags |= V4L2_BUF_FLAG_DONE;
+ break;
+ case VB2_BUF_STATE_PREPARING:
+ case VB2_BUF_STATE_DEQUEUED:
+ /* nothing */
+ break;
+ }
+
+ if ((vb->state == VB2_BUF_STATE_DEQUEUED ||
+ vb->state == VB2_BUF_STATE_IN_REQUEST) &&
+ vb->synced && vb->prepared)
+ *flags |= V4L2_BUF_FLAG_PREPARED;
+
+ if (vb2_buffer_in_use(q, vb))
+ *flags |= V4L2_BUF_FLAG_MAPPED;
+ if (vbuf->request_fd >= 0) {
+ *flags |= V4L2_BUF_FLAG_REQUEST_FD;
+ *request_fd = vbuf->request_fd;
+ }
+}
+
/*
* __fill_v4l2_buffer() - fill in a struct v4l2_buffer with information to be
* returned to userspace
@@ -572,51 +634,7 @@ static void __fill_v4l2_buffer(struct vb2_buffer *vb, void *pb)
b->m.fd = vb->planes[0].m.fd;
}

- /*
- * Clear any buffer state related flags.
- */
- b->flags &= ~V4L2_BUFFER_MASK_FLAGS;
- b->flags |= q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK;
- if (!q->copy_timestamp) {
- /*
- * For non-COPY timestamps, drop timestamp source bits
- * and obtain the timestamp source from the queue.
- */
- b->flags &= ~V4L2_BUF_FLAG_TSTAMP_SRC_MASK;
- b->flags |= q->timestamp_flags & V4L2_BUF_FLAG_TSTAMP_SRC_MASK;
- }
-
- switch (vb->state) {
- case VB2_BUF_STATE_QUEUED:
- case VB2_BUF_STATE_ACTIVE:
- b->flags |= V4L2_BUF_FLAG_QUEUED;
- break;
- case VB2_BUF_STATE_IN_REQUEST:
- b->flags |= V4L2_BUF_FLAG_IN_REQUEST;
- break;
- case VB2_BUF_STATE_ERROR:
- b->flags |= V4L2_BUF_FLAG_ERROR;
- fallthrough;
- case VB2_BUF_STATE_DONE:
- b->flags |= V4L2_BUF_FLAG_DONE;
- break;
- case VB2_BUF_STATE_PREPARING:
- case VB2_BUF_STATE_DEQUEUED:
- /* nothing */
- break;
- }
-
- if ((vb->state == VB2_BUF_STATE_DEQUEUED ||
- vb->state == VB2_BUF_STATE_IN_REQUEST) &&
- vb->synced && vb->prepared)
- b->flags |= V4L2_BUF_FLAG_PREPARED;
-
- if (vb2_buffer_in_use(q, vb))
- b->flags |= V4L2_BUF_FLAG_MAPPED;
- if (vbuf->request_fd >= 0) {
- b->flags |= V4L2_BUF_FLAG_REQUEST_FD;
- b->request_fd = vbuf->request_fd;
- }
+ v4l2_clear_buffer_flags(vb, &b->flags, q, vbuf, &b->request_fd);
}

/*
--
2.29.2