linux-kernel - [RFC PATCH 6/9] [media] m2m: add generic support for jobs API

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Date:   Thu, 28 Sep 2017 18:50:24 +0900
From:   Alexandre Courbot <acourbot@...omium.org>
To:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Hans Verkuil <hverkuil@...all.nl>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Pawel Osciak <pawel@...iak.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Tomasz Figa <tfiga@...omium.org>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Gustavo Padovan <gustavo.padovan@...labora.com>
Cc:     linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        Alexandre Courbot <acourbot@...omium.org>
Subject: [RFC PATCH 6/9] [media] m2m: add generic support for jobs API

Add a v4l2_mem_ctx_job_init() function that drivers using m2m can call
at init time in order to set the state handler.

Also make sure to call v4l2_jobqueue_job_finish() when the jobs API is
used and all buffers for the current job have been processed.

Signed-off-by: Alexandre Courbot <acourbot@...omium.org>
---
 drivers/media/v4l2-core/v4l2-mem2mem.c | 19 +++++++++++++++++++
 include/media/v4l2-mem2mem.h           | 11 +++++++++++
 2 files changed, 30 insertions(+)

diff --git a/drivers/media/v4l2-core/v4l2-mem2mem.c b/drivers/media/v4l2-core/v4l2-mem2mem.c
index f62e68aa04c4..dc4d8b16c0e2 100644
--- a/drivers/media/v4l2-core/v4l2-mem2mem.c
+++ b/drivers/media/v4l2-core/v4l2-mem2mem.c
@@ -22,6 +22,8 @@
 #include <media/v4l2-dev.h>
 #include <media/v4l2-fh.h>
 #include <media/v4l2-event.h>
+#include <media/v4l2-job-state.h>
+#include <media/v4l2-jobqueue.h>
 
 MODULE_DESCRIPTION("Mem to mem device framework for videobuf");
 MODULE_AUTHOR("Pawel Osciak, <pawel@...iak.com>");
@@ -333,6 +335,13 @@ void v4l2_m2m_job_finish(struct v4l2_m2m_dev *m2m_dev,
 
 	spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags);
 
+	/* Jobs mode: if we have no more buffers for the current job,
+	 * consider it completed */
+	if (m2m_ctx->state && m2m_ctx->state->active_state &&
+	    v4l2_m2m_next_src_buf(m2m_ctx) == NULL &&
+	    v4l2_m2m_next_dst_buf(m2m_ctx) == NULL)
+		v4l2_jobqueue_job_finish(m2m_ctx->state);
+
 	/* This instance might have more buffers ready, but since we do not
 	 * allow more than one job on the job_queue per instance, each has
 	 * to be scheduled separately after the previous one finishes. */
@@ -665,6 +674,16 @@ struct v4l2_m2m_ctx *v4l2_m2m_ctx_init(struct v4l2_m2m_dev *m2m_dev,
 }
 EXPORT_SYMBOL_GPL(v4l2_m2m_ctx_init);
 
+void v4l2_mem_ctx_job_init(struct v4l2_m2m_ctx *ctx,
+			   struct v4l2_job_state_handler *hdl)
+{
+	ctx->state = hdl;
+
+	ctx->out_q_ctx.q.state_handler = hdl;
+	ctx->cap_q_ctx.q.state_handler = hdl;
+}
+EXPORT_SYMBOL_GPL(v4l2_mem_ctx_job_init);
+
 void v4l2_m2m_ctx_release(struct v4l2_m2m_ctx *m2m_ctx)
 {
 	/* wait until the current context is dequeued from job_queue */
diff --git a/include/media/v4l2-mem2mem.h b/include/media/v4l2-mem2mem.h
index e157d5c9b224..4ba18a32c9b0 100644
--- a/include/media/v4l2-mem2mem.h
+++ b/include/media/v4l2-mem2mem.h
@@ -83,6 +83,7 @@ struct v4l2_m2m_queue_ctx {
  *
  * @q_lock: struct &mutex lock
  * @m2m_dev: opaque pointer to the internal data to handle M2M context
+ * @state: Pointer to state handler for channel support
  * @cap_q_ctx: Capture (output to memory) queue context
  * @out_q_ctx: Output (input from memory) queue context
  * @queue: List of memory to memory contexts
@@ -100,6 +101,7 @@ struct v4l2_m2m_ctx {
 
 	/* internal use only */
 	struct v4l2_m2m_dev		*m2m_dev;
+	struct v4l2_job_state_handler	*state;
 
 	struct v4l2_m2m_queue_ctx	cap_q_ctx;
 
@@ -351,6 +353,15 @@ struct v4l2_m2m_ctx *v4l2_m2m_ctx_init(struct v4l2_m2m_dev *m2m_dev,
 		void *drv_priv,
 		int (*queue_init)(void *priv, struct vb2_queue *src_vq, struct vb2_queue *dst_vq));
 
+/**
+ * v4l2_mem_ctx_channel_init() - enable a context to be used in a channel
+ *
+ * @ctx: context to potentially use within a channel
+ * @hal: state handler that will be used with this context
+ */
+void v4l2_mem_ctx_job_init(struct v4l2_m2m_ctx *ctx,
+			       struct v4l2_job_state_handler *hdl);
+
 static inline void v4l2_m2m_set_src_buffered(struct v4l2_m2m_ctx *m2m_ctx,
 					     bool buffered)
 {
-- 
2.14.2.822.g60be5d43e6-goog