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From:   Jernej Skrabec <jernej.skrabec@gmail.com>
To:     mripard@kernel.org, paul.kocialkowski@bootlin.com, wens@csie.org,
        samuel@sholland.org
Cc:     mchehab@kernel.org, gregkh@linuxfoundation.org,
        hverkuil-cisco@xs4all.nl, linux-media@vger.kernel.org,
        linux-staging@lists.linux.dev,
        linux-arm-kernel@lists.infradead.org, linux-sunxi@lists.linux.dev,
        linux-kernel@vger.kernel.org,
        Jernej Skrabec <jernej.skrabec@gmail.com>
Subject: [PATCH 4/7] media: cedrus: Add error handling for failed setup
Date:   Mon, 20 Jun 2022 19:55:14 +0200
Message-Id: <20220620175517.648767-5-jernej.skrabec@gmail.com>
In-Reply-To: <20220620175517.648767-1-jernej.skrabec@gmail.com>
References: <20220620175517.648767-1-jernej.skrabec@gmail.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

During decoding setup stage for complex codecs like HEVC driver can
detect inconsistent values in controls or some other task, like
allocating memory, can fail.

Currently setup stage has no way of signalling error. Change return type
of setup callback to int and if returned value is not zero, skip
decoding and finish job immediately with error flag.

While currently there is only one place when setup can fail, it's
expected that there will be more such cases in the future, when HEVC
decoding is improved.

Signed-off-by: Jernej Skrabec <jernej.skrabec@gmail.com>
---
 drivers/staging/media/sunxi/cedrus/cedrus.h   |  2 +-
 .../staging/media/sunxi/cedrus/cedrus_dec.c   | 21 ++++++++++++++-----
 .../staging/media/sunxi/cedrus/cedrus_h264.c  |  5 +++--
 .../staging/media/sunxi/cedrus/cedrus_h265.c  |  8 +++----
 .../staging/media/sunxi/cedrus/cedrus_mpeg2.c |  4 +++-
 .../staging/media/sunxi/cedrus/cedrus_vp8.c   |  5 +++--
 6 files changed, 30 insertions(+), 15 deletions(-)

diff --git a/drivers/staging/media/sunxi/cedrus/cedrus.h b/drivers/staging/media/sunxi/cedrus/cedrus.h
index 3bc094eb497f..d2b697a9ded2 100644
--- a/drivers/staging/media/sunxi/cedrus/cedrus.h
+++ b/drivers/staging/media/sunxi/cedrus/cedrus.h
@@ -162,7 +162,7 @@ struct cedrus_dec_ops {
 	void (*irq_clear)(struct cedrus_ctx *ctx);
 	void (*irq_disable)(struct cedrus_ctx *ctx);
 	enum cedrus_irq_status (*irq_status)(struct cedrus_ctx *ctx);
-	void (*setup)(struct cedrus_ctx *ctx, struct cedrus_run *run);
+	int (*setup)(struct cedrus_ctx *ctx, struct cedrus_run *run);
 	int (*start)(struct cedrus_ctx *ctx);
 	void (*stop)(struct cedrus_ctx *ctx);
 	void (*trigger)(struct cedrus_ctx *ctx);
diff --git a/drivers/staging/media/sunxi/cedrus/cedrus_dec.c b/drivers/staging/media/sunxi/cedrus/cedrus_dec.c
index aabe6253078e..b0944abaacbd 100644
--- a/drivers/staging/media/sunxi/cedrus/cedrus_dec.c
+++ b/drivers/staging/media/sunxi/cedrus/cedrus_dec.c
@@ -28,6 +28,7 @@ void cedrus_device_run(void *priv)
 	struct cedrus_dev *dev = ctx->dev;
 	struct cedrus_run run = {};
 	struct media_request *src_req;
+	int error;
 
 	run.src = v4l2_m2m_next_src_buf(ctx->fh.m2m_ctx);
 	run.dst = v4l2_m2m_next_dst_buf(ctx->fh.m2m_ctx);
@@ -89,16 +90,26 @@ void cedrus_device_run(void *priv)
 
 	cedrus_dst_format_set(dev, &ctx->dst_fmt);
 
-	dev->dec_ops[ctx->current_codec]->setup(ctx, &run);
+	error = dev->dec_ops[ctx->current_codec]->setup(ctx, &run);
+	if (error)
+		v4l2_err(&ctx->dev->v4l2_dev,
+			 "Failed to setup decoding job: %d\n", error);
 
 	/* Complete request(s) controls if needed. */
 
 	if (src_req)
 		v4l2_ctrl_request_complete(src_req, &ctx->hdl);
 
-	dev->dec_ops[ctx->current_codec]->trigger(ctx);
+	/* Trigger decoding if setup went well, bail out otherwise. */
+	if (!error) {
+		dev->dec_ops[ctx->current_codec]->trigger(ctx);
 
-	/* Start the watchdog timer. */
-	schedule_delayed_work(&dev->watchdog_work,
-			      msecs_to_jiffies(2000));
+		/* Start the watchdog timer. */
+		schedule_delayed_work(&dev->watchdog_work,
+				      msecs_to_jiffies(2000));
+	} else {
+		v4l2_m2m_buf_done_and_job_finish(ctx->dev->m2m_dev,
+						 ctx->fh.m2m_ctx,
+						 VB2_BUF_STATE_ERROR);
+	}
 }
diff --git a/drivers/staging/media/sunxi/cedrus/cedrus_h264.c b/drivers/staging/media/sunxi/cedrus/cedrus_h264.c
index d8fb93035470..c345e67ba9bc 100644
--- a/drivers/staging/media/sunxi/cedrus/cedrus_h264.c
+++ b/drivers/staging/media/sunxi/cedrus/cedrus_h264.c
@@ -493,8 +493,7 @@ static void cedrus_h264_irq_disable(struct cedrus_ctx *ctx)
 		     reg & ~VE_H264_CTRL_INT_MASK);
 }
 
-static void cedrus_h264_setup(struct cedrus_ctx *ctx,
-			      struct cedrus_run *run)
+static int cedrus_h264_setup(struct cedrus_ctx *ctx, struct cedrus_run *run)
 {
 	struct cedrus_dev *dev = ctx->dev;
 
@@ -510,6 +509,8 @@ static void cedrus_h264_setup(struct cedrus_ctx *ctx,
 	cedrus_write_frame_list(ctx, run);
 
 	cedrus_set_params(ctx, run);
+
+	return 0;
 }
 
 static int cedrus_h264_start(struct cedrus_ctx *ctx)
diff --git a/drivers/staging/media/sunxi/cedrus/cedrus_h265.c b/drivers/staging/media/sunxi/cedrus/cedrus_h265.c
index 46119912c387..cfde4ccf6011 100644
--- a/drivers/staging/media/sunxi/cedrus/cedrus_h265.c
+++ b/drivers/staging/media/sunxi/cedrus/cedrus_h265.c
@@ -326,8 +326,7 @@ static int cedrus_h265_is_low_delay(struct cedrus_run *run)
 	return 0;
 }
 
-static void cedrus_h265_setup(struct cedrus_ctx *ctx,
-			      struct cedrus_run *run)
+static int cedrus_h265_setup(struct cedrus_ctx *ctx, struct cedrus_run *run)
 {
 	struct cedrus_dev *dev = ctx->dev;
 	const struct v4l2_ctrl_hevc_sps *sps;
@@ -385,8 +384,7 @@ static void cedrus_h265_setup(struct cedrus_ctx *ctx,
 					GFP_KERNEL, DMA_ATTR_NO_KERNEL_MAPPING);
 		if (!ctx->codec.h265.mv_col_buf) {
 			ctx->codec.h265.mv_col_buf_size = 0;
-			// TODO: Abort the process here.
-			return;
+			return -ENOMEM;
 		}
 	}
 
@@ -703,6 +701,8 @@ static void cedrus_h265_setup(struct cedrus_ctx *ctx,
 
 	/* Enable appropriate interruptions. */
 	cedrus_write(dev, VE_DEC_H265_CTRL, VE_DEC_H265_CTRL_IRQ_MASK);
+
+	return 0;
 }
 
 static int cedrus_h265_start(struct cedrus_ctx *ctx)
diff --git a/drivers/staging/media/sunxi/cedrus/cedrus_mpeg2.c b/drivers/staging/media/sunxi/cedrus/cedrus_mpeg2.c
index 5dad2f296c6d..4cfc4a3c8a7f 100644
--- a/drivers/staging/media/sunxi/cedrus/cedrus_mpeg2.c
+++ b/drivers/staging/media/sunxi/cedrus/cedrus_mpeg2.c
@@ -48,7 +48,7 @@ static void cedrus_mpeg2_irq_disable(struct cedrus_ctx *ctx)
 	cedrus_write(dev, VE_DEC_MPEG_CTRL, reg);
 }
 
-static void cedrus_mpeg2_setup(struct cedrus_ctx *ctx, struct cedrus_run *run)
+static int cedrus_mpeg2_setup(struct cedrus_ctx *ctx, struct cedrus_run *run)
 {
 	const struct v4l2_ctrl_mpeg2_sequence *seq;
 	const struct v4l2_ctrl_mpeg2_picture *pic;
@@ -185,6 +185,8 @@ static void cedrus_mpeg2_setup(struct cedrus_ctx *ctx, struct cedrus_run *run)
 	      VE_DEC_MPEG_CTRL_MC_CACHE_EN;
 
 	cedrus_write(dev, VE_DEC_MPEG_CTRL, reg);
+
+	return 0;
 }
 
 static void cedrus_mpeg2_trigger(struct cedrus_ctx *ctx)
diff --git a/drivers/staging/media/sunxi/cedrus/cedrus_vp8.c b/drivers/staging/media/sunxi/cedrus/cedrus_vp8.c
index f4016684b32d..3f750d1795b6 100644
--- a/drivers/staging/media/sunxi/cedrus/cedrus_vp8.c
+++ b/drivers/staging/media/sunxi/cedrus/cedrus_vp8.c
@@ -651,8 +651,7 @@ static void cedrus_vp8_irq_disable(struct cedrus_ctx *ctx)
 		     reg & ~VE_H264_CTRL_INT_MASK);
 }
 
-static void cedrus_vp8_setup(struct cedrus_ctx *ctx,
-			     struct cedrus_run *run)
+static int cedrus_vp8_setup(struct cedrus_ctx *ctx, struct cedrus_run *run)
 {
 	const struct v4l2_ctrl_vp8_frame *slice = run->vp8.frame_params;
 	struct vb2_queue *cap_q = &ctx->fh.m2m_ctx->cap_q_ctx.q;
@@ -855,6 +854,8 @@ static void cedrus_vp8_setup(struct cedrus_ctx *ctx,
 		ctx->codec.vp8.last_sharpness_level =
 			slice->lf.sharpness_level;
 	}
+
+	return 0;
 }
 
 static int cedrus_vp8_start(struct cedrus_ctx *ctx)
-- 
2.36.1