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Subject[PATCH RFC 3/4] media: cedrus: Request access to reference buffers when decoding
Date
Because we need to request and release access to reference buffers
that are backed by a dma-buf import, keep track of the buffers used
as reference and add the appropriate calls in the device_run and
job_done m2m callbacks. The latter is introduced for this purpose.

Signed-off-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
---
drivers/staging/media/sunxi/cedrus/cedrus.c | 1 +
drivers/staging/media/sunxi/cedrus/cedrus.h | 1 +
.../staging/media/sunxi/cedrus/cedrus_dec.c | 18 ++++++++++++++++++
.../staging/media/sunxi/cedrus/cedrus_dec.h | 1 +
.../staging/media/sunxi/cedrus/cedrus_mpeg2.c | 8 ++++++++
5 files changed, 29 insertions(+)

diff --git a/drivers/staging/media/sunxi/cedrus/cedrus.c b/drivers/staging/media/sunxi/cedrus/cedrus.c
index ff11cbeba205..a2c75eb01c2c 100644
--- a/drivers/staging/media/sunxi/cedrus/cedrus.c
+++ b/drivers/staging/media/sunxi/cedrus/cedrus.c
@@ -250,6 +250,7 @@ static const struct video_device cedrus_video_device = {

static const struct v4l2_m2m_ops cedrus_m2m_ops = {
.device_run = cedrus_device_run,
+ .job_done = cedrus_job_done,
};

static const struct media_device_ops cedrus_m2m_media_ops = {
diff --git a/drivers/staging/media/sunxi/cedrus/cedrus.h b/drivers/staging/media/sunxi/cedrus/cedrus.h
index 4aedd24a9848..c1ce3c4ae2a1 100644
--- a/drivers/staging/media/sunxi/cedrus/cedrus.h
+++ b/drivers/staging/media/sunxi/cedrus/cedrus.h
@@ -77,6 +77,7 @@ struct cedrus_ctx {
struct v4l2_ctrl **ctrls;

struct vb2_buffer *dst_bufs[VIDEO_MAX_FRAME];
+ bool reference_bufs[VIDEO_MAX_FRAME];
};

struct cedrus_dec_ops {
diff --git a/drivers/staging/media/sunxi/cedrus/cedrus_dec.c b/drivers/staging/media/sunxi/cedrus/cedrus_dec.c
index 2c295286766c..90bf51e71f4f 100644
--- a/drivers/staging/media/sunxi/cedrus/cedrus_dec.c
+++ b/drivers/staging/media/sunxi/cedrus/cedrus_dec.c
@@ -41,6 +41,7 @@ void cedrus_device_run(void *priv)
struct cedrus_dev *dev = ctx->dev;
struct cedrus_run run = {};
struct media_request *src_req;
+ unsigned int i;

run.src = v4l2_m2m_next_src_buf(ctx->fh.m2m_ctx);
run.dst = v4l2_m2m_next_dst_buf(ctx->fh.m2m_ctx);
@@ -63,10 +64,17 @@ void cedrus_device_run(void *priv)
break;
}

+ for (i = 0; i < VIDEO_MAX_FRAME; i++)
+ ctx->reference_bufs[i] = false;
+
v4l2_m2m_buf_copy_data(run.src, run.dst, true);

dev->dec_ops[ctx->current_codec]->setup(ctx, &run);

+ for (i = 0; i < VIDEO_MAX_FRAME; i++)
+ if (ctx->reference_bufs[i] && ctx->dst_bufs[i])
+ vb2_buffer_access_request(ctx->dst_bufs[i]);
+
/* Complete request(s) controls if needed. */

if (src_req)
@@ -74,3 +82,13 @@ void cedrus_device_run(void *priv)

dev->dec_ops[ctx->current_codec]->trigger(ctx);
}
+
+void cedrus_job_done(void *priv)
+{
+ struct cedrus_ctx *ctx = priv;
+ unsigned int i;
+
+ for (i = 0; i < VIDEO_MAX_FRAME; i++)
+ if (ctx->reference_bufs[i] && ctx->dst_bufs[i])
+ vb2_buffer_access_release(ctx->dst_bufs[i]);
+}
diff --git a/drivers/staging/media/sunxi/cedrus/cedrus_dec.h b/drivers/staging/media/sunxi/cedrus/cedrus_dec.h
index 8d0fc248220f..9265f28e6dbe 100644
--- a/drivers/staging/media/sunxi/cedrus/cedrus_dec.h
+++ b/drivers/staging/media/sunxi/cedrus/cedrus_dec.h
@@ -19,5 +19,6 @@
int cedrus_reference_index_find(struct vb2_queue *queue,
struct vb2_buffer *vb2_buf, u64 timestamp);
void cedrus_device_run(void *priv);
+void cedrus_job_done(void *priv);

#endif
diff --git a/drivers/staging/media/sunxi/cedrus/cedrus_mpeg2.c b/drivers/staging/media/sunxi/cedrus/cedrus_mpeg2.c
index 81c66a8aa1ac..2e7deded17aa 100644
--- a/drivers/staging/media/sunxi/cedrus/cedrus_mpeg2.c
+++ b/drivers/staging/media/sunxi/cedrus/cedrus_mpeg2.c
@@ -162,6 +162,10 @@ static void cedrus_mpeg2_setup(struct cedrus_ctx *ctx, struct cedrus_run *run)
/* Forward and backward prediction reference buffers. */
forward_idx = cedrus_reference_index_find(cap_q, &run->dst->vb2_buf,
slice_params->forward_ref_ts);
+ if (forward_idx < 0)
+ return;
+
+ ctx->reference_bufs[forward_idx] = true;

fwd_luma_addr = cedrus_dst_buf_addr(ctx, forward_idx, 0);
fwd_chroma_addr = cedrus_dst_buf_addr(ctx, forward_idx, 1);
@@ -171,6 +175,10 @@ static void cedrus_mpeg2_setup(struct cedrus_ctx *ctx, struct cedrus_run *run)

backward_idx = cedrus_reference_index_find(cap_q, &run->dst->vb2_buf,
slice_params->backward_ref_ts);
+ if (forward_idx < 0)
+ return;
+
+ ctx->reference_bufs[backward_idx] = true;

bwd_luma_addr = cedrus_dst_buf_addr(ctx, backward_idx, 0);
bwd_chroma_addr = cedrus_dst_buf_addr(ctx, backward_idx, 1);
--
2.20.1
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