[PATCH v15 13/56] media: mediatek: vcodec: Stop direct calls to queue num_buffers field

[PATCH v15 13/56] media: mediatek: vcodec: Stop direct calls to queue num_buffers field

[Benjamin Gaignard]

Use vb2_get_num_buffers() to avoid using queue num_buffers field directly.
This allows us to change how the number of buffers is computed in the
future.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>
Reviewed-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com>
CC: Bin Liu <bin.liu@mediatek.com>
CC: Matthias Brugger <matthias.bgg@gmail.com>
---
 drivers/media/platform/mediatek/vcodec/encoder/mtk_vcodec_enc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/media/platform/mediatek/vcodec/encoder/mtk_vcodec_enc.c b/drivers/media/platform/mediatek/vcodec/encoder/mtk_vcodec_enc.c
index eb381fa6e7d1..181884e798fd 100644
--- a/drivers/media/platform/mediatek/vcodec/encoder/mtk_vcodec_enc.c
+++ b/drivers/media/platform/mediatek/vcodec/encoder/mtk_vcodec_enc.c
@@ -912,7 +912,7 @@ static int vb2ops_venc_start_streaming(struct vb2_queue *q, unsigned int count)
 	return 0;
 
 err_start_stream:
-	for (i = 0; i < q->num_buffers; ++i) {
+	for (i = 0; i < vb2_get_num_buffers(q); ++i) {
 		struct vb2_buffer *buf = vb2_get_buffer(q, i);
 
 		/*
-- 
2.39.2

[PATCH v15 14/56] media: sti: hva: Remove useless check

[Benjamin Gaignard]

Remove index range test since it is done by vb2_get_buffer().
vb2_get_buffer() can return a NULL pointer so we need the return
value.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>
CC: Jean-Christophe Trotin <jean-christophe.trotin@foss.st.com>
---
 drivers/media/platform/st/sti/hva/hva-v4l2.c | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/drivers/media/platform/st/sti/hva/hva-v4l2.c b/drivers/media/platform/st/sti/hva/hva-v4l2.c
index 3a848ca32a0e..cfe83e9dc01b 100644
--- a/drivers/media/platform/st/sti/hva/hva-v4l2.c
+++ b/drivers/media/platform/st/sti/hva/hva-v4l2.c
@@ -569,14 +569,11 @@ static int hva_qbuf(struct file *file, void *priv, struct v4l2_buffer *buf)
 		struct vb2_buffer *vb2_buf;
 
 		vq = v4l2_m2m_get_vq(ctx->fh.m2m_ctx, buf->type);
-
-		if (buf->index >= vq->num_buffers) {
-			dev_dbg(dev, "%s buffer index %d out of range (%d)\n",
-				ctx->name, buf->index, vq->num_buffers);
+		vb2_buf = vb2_get_buffer(vq, buf->index);
+		if (!vb2_buf) {
+			dev_dbg(dev, "%s buffer index %d not found\n", ctx->name, buf->index);
 			return -EINVAL;
 		}
-
-		vb2_buf = vb2_get_buffer(vq, buf->index);
 		stream = to_hva_stream(to_vb2_v4l2_buffer(vb2_buf));
 		stream->bytesused = buf->bytesused;
 	}
-- 
2.39.2

Re: [PATCH v15 14/56] media: sti: hva: Remove useless check

[Andrzej Pietrasiewicz]

W dniu 9.11.2023 o 17:34, Benjamin Gaignard pisze:
> Remove index range test since it is done by vb2_get_buffer().
> vb2_get_buffer() can return a NULL pointer so we need the return
> value.
> 
> Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>

Reviewed-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com>

> CC: Jean-Christophe Trotin <jean-christophe.trotin@foss.st.com>
> ---
>   drivers/media/platform/st/sti/hva/hva-v4l2.c | 9 +++------
>   1 file changed, 3 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/media/platform/st/sti/hva/hva-v4l2.c b/drivers/media/platform/st/sti/hva/hva-v4l2.c
> index 3a848ca32a0e..cfe83e9dc01b 100644
> --- a/drivers/media/platform/st/sti/hva/hva-v4l2.c
> +++ b/drivers/media/platform/st/sti/hva/hva-v4l2.c
> @@ -569,14 +569,11 @@ static int hva_qbuf(struct file *file, void *priv, struct v4l2_buffer *buf)
>   		struct vb2_buffer *vb2_buf;
>   
>   		vq = v4l2_m2m_get_vq(ctx->fh.m2m_ctx, buf->type);
> -
> -		if (buf->index >= vq->num_buffers) {
> -			dev_dbg(dev, "%s buffer index %d out of range (%d)\n",
> -				ctx->name, buf->index, vq->num_buffers);
> +		vb2_buf = vb2_get_buffer(vq, buf->index);
> +		if (!vb2_buf) {
> +			dev_dbg(dev, "%s buffer index %d not found\n", ctx->name, buf->index);
>   			return -EINVAL;
>   		}
> -
> -		vb2_buf = vb2_get_buffer(vq, buf->index);
>   		stream = to_hva_stream(to_vb2_v4l2_buffer(vb2_buf));
>   		stream->bytesused = buf->bytesused;
>   	}

[PATCH v15 15/56] media: visl: Use vb2_get_buffer() instead of directly access to buffers array

[Benjamin Gaignard]

Use vb2_get_buffer() instead of direct access to the vb2_queue bufs array.
This allows us to change the type of the bufs in the future.
After each call to vb2_get_buffer() we need to be sure that we get
a valid pointer so check the return value of all of them.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>
Reviewed-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com>
CC: Daniel Almeida <daniel.almeida@collabora.com>
CC: Mauro Carvalho Chehab <mchehab@kernel.org>
---
 drivers/media/test-drivers/visl/visl-dec.c | 28 ++++++++++++++++------
 1 file changed, 21 insertions(+), 7 deletions(-)

diff --git a/drivers/media/test-drivers/visl/visl-dec.c b/drivers/media/test-drivers/visl/visl-dec.c
index 318d675e5668..ba20ea998d19 100644
--- a/drivers/media/test-drivers/visl/visl-dec.c
+++ b/drivers/media/test-drivers/visl/visl-dec.c
@@ -290,13 +290,20 @@ static void visl_tpg_fill(struct visl_ctx *ctx, struct visl_run *run)
 	for (i = 0; i < out_q->num_buffers; i++) {
 		char entry[] = "index: %u, state: %s, request_fd: %d, ";
 		u32 old_len = len;
-		char *q_status = visl_get_vb2_state(out_q->bufs[i]->state);
+		struct vb2_buffer *vb2;
+		char *q_status;
+
+		vb2 = vb2_get_buffer(out_q, i);
+		if (!vb2)
+			continue;
+
+		q_status = visl_get_vb2_state(vb2->state);
 
 		len += scnprintf(&buf[len], TPG_STR_BUF_SZ - len,
 				 entry, i, q_status,
-				 to_vb2_v4l2_buffer(out_q->bufs[i])->request_fd);
+				 to_vb2_v4l2_buffer(vb2)->request_fd);
 
-		len += visl_fill_bytesused(to_vb2_v4l2_buffer(out_q->bufs[i]),
+		len += visl_fill_bytesused(to_vb2_v4l2_buffer(vb2),
 					   &buf[len],
 					   TPG_STR_BUF_SZ - len);
 
@@ -342,13 +349,20 @@ static void visl_tpg_fill(struct visl_ctx *ctx, struct visl_run *run)
 	len = 0;
 	for (i = 0; i < cap_q->num_buffers; i++) {
 		u32 old_len = len;
-		char *q_status = visl_get_vb2_state(cap_q->bufs[i]->state);
+		struct vb2_buffer *vb2;
+		char *q_status;
+
+		vb2 = vb2_get_buffer(cap_q, i);
+		if (!vb2)
+			continue;
+
+		q_status = visl_get_vb2_state(vb2->state);
 
 		len += scnprintf(&buf[len], TPG_STR_BUF_SZ - len,
 				 "index: %u, status: %s, timestamp: %llu, is_held: %d",
-				 cap_q->bufs[i]->index, q_status,
-				 cap_q->bufs[i]->timestamp,
-				 to_vb2_v4l2_buffer(cap_q->bufs[i])->is_held);
+				 vb2->index, q_status,
+				 vb2->timestamp,
+				 to_vb2_v4l2_buffer(vb2)->is_held);
 
 		tpg_gen_text(&ctx->tpg, basep, line++ * line_height, 16, &buf[old_len]);
 		frame_dprintk(ctx->dev, run->dst->sequence, "%s", &buf[old_len]);
-- 
2.39.2

[PATCH v15 16/56] media: atomisp: Use vb2_get_buffer() instead of directly access to buffers array

[Benjamin Gaignard]

Use vb2_get_buffer() instead of direct access to the vb2_queue bufs array.
This allows us to change the type of the bufs in the future.
No need to check the result of vb2_get_buffer, vb2_ioctl_dqbuf() already
checked that it is valid.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
CC: Mauro Carvalho Chehab <mchehab@kernel.org>
CC: Sakari Ailus <sakari.ailus@linux.intel.com>
---
 drivers/staging/media/atomisp/pci/atomisp_ioctl.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/media/atomisp/pci/atomisp_ioctl.c b/drivers/staging/media/atomisp/pci/atomisp_ioctl.c
index a8e4779d007f..a8a964b2f1a8 100644
--- a/drivers/staging/media/atomisp/pci/atomisp_ioctl.c
+++ b/drivers/staging/media/atomisp/pci/atomisp_ioctl.c
@@ -1059,7 +1059,7 @@ static int atomisp_dqbuf_wrapper(struct file *file, void *fh, struct v4l2_buffer
 	if (ret)
 		return ret;
 
-	vb = pipe->vb_queue.bufs[buf->index];
+	vb = vb2_get_buffer(&pipe->vb_queue, buf->index);
 	frame = vb_to_frame(vb);
 
 	buf->reserved = asd->frame_status[buf->index];
-- 
2.39.2

[PATCH v15 17/56] media: atomisp: Stop direct calls to queue num_buffers field

[Benjamin Gaignard]

Use vb2_get_num_buffers() to avoid using queue num_buffers field directly.
This allows us to change how the number of buffers is computed in the
future.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
CC: Sakari Ailus <sakari.ailus@linux.intel.com>
---
 drivers/staging/media/atomisp/pci/atomisp_ioctl.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/media/atomisp/pci/atomisp_ioctl.c b/drivers/staging/media/atomisp/pci/atomisp_ioctl.c
index a8a964b2f1a8..09c0091b920f 100644
--- a/drivers/staging/media/atomisp/pci/atomisp_ioctl.c
+++ b/drivers/staging/media/atomisp/pci/atomisp_ioctl.c
@@ -1028,7 +1028,7 @@ static int atomisp_qbuf_wrapper(struct file *file, void *fh, struct v4l2_buffer
 	struct atomisp_device *isp = video_get_drvdata(vdev);
 	struct atomisp_video_pipe *pipe = atomisp_to_video_pipe(vdev);
 
-	if (buf->index >= vdev->queue->num_buffers)
+	if (buf->index >= vb2_get_num_buffers(vdev->queue))
 		return -EINVAL;
 
 	if (buf->reserved2 & ATOMISP_BUFFER_HAS_PER_FRAME_SETTING) {
-- 
2.39.2

[PATCH v15 18/56] media: dvb-core: Use vb2_get_buffer() instead of directly access to buffers array

[Benjamin Gaignard]

Use vb2_get_buffer() instead of direct access to the vb2_queue bufs array.
This allows us to change the type of the bufs in the future.
After each call to vb2_get_buffer() we need to be sure that we get
a valid pointer so check the return value of all of them.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>
Reviewed-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com>
---
 drivers/media/dvb-core/dvb_vb2.c | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/drivers/media/dvb-core/dvb_vb2.c b/drivers/media/dvb-core/dvb_vb2.c
index b322ef179f05..3a966fdf814c 100644
--- a/drivers/media/dvb-core/dvb_vb2.c
+++ b/drivers/media/dvb-core/dvb_vb2.c
@@ -355,12 +355,13 @@ int dvb_vb2_reqbufs(struct dvb_vb2_ctx *ctx, struct dmx_requestbuffers *req)
 int dvb_vb2_querybuf(struct dvb_vb2_ctx *ctx, struct dmx_buffer *b)
 {
 	struct vb2_queue *q = &ctx->vb_q;
+	struct vb2_buffer *vb2 = vb2_get_buffer(q, b->index);
 
-	if (b->index >= q->num_buffers) {
-		dprintk(1, "[%s] buffer index out of range\n", ctx->name);
+	if (!vb2) {
+		dprintk(1, "[%s] invalid buffer index\n", ctx->name);
 		return -EINVAL;
 	}
-	vb2_core_querybuf(&ctx->vb_q, q->bufs[b->index], b);
+	vb2_core_querybuf(&ctx->vb_q, vb2, b);
 	dprintk(3, "[%s] index=%d\n", ctx->name, b->index);
 	return 0;
 }
@@ -385,13 +386,14 @@ int dvb_vb2_expbuf(struct dvb_vb2_ctx *ctx, struct dmx_exportbuffer *exp)
 int dvb_vb2_qbuf(struct dvb_vb2_ctx *ctx, struct dmx_buffer *b)
 {
 	struct vb2_queue *q = &ctx->vb_q;
+	struct vb2_buffer *vb2 = vb2_get_buffer(q, b->index);
 	int ret;
 
-	if (b->index >= q->num_buffers) {
-		dprintk(1, "[%s] buffer index out of range\n", ctx->name);
+	if (!vb2) {
+		dprintk(1, "[%s] invalid buffer index\n", ctx->name);
 		return -EINVAL;
 	}
-	ret = vb2_core_qbuf(&ctx->vb_q, q->bufs[b->index], b, NULL);
+	ret = vb2_core_qbuf(&ctx->vb_q, vb2, b, NULL);
 	if (ret) {
 		dprintk(1, "[%s] index=%d errno=%d\n", ctx->name,
 			b->index, ret);
-- 
2.39.2

[PATCH v15 19/56] media: dvb-core: Do not initialize twice queue num_buffer field

[Benjamin Gaignard]

The above memset already zeroed all the ctx fields, it is useless
to do it here again.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>
---
 drivers/media/dvb-core/dvb_vb2.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/drivers/media/dvb-core/dvb_vb2.c b/drivers/media/dvb-core/dvb_vb2.c
index 3a966fdf814c..167ff82a6fed 100644
--- a/drivers/media/dvb-core/dvb_vb2.c
+++ b/drivers/media/dvb-core/dvb_vb2.c
@@ -167,8 +167,6 @@ int dvb_vb2_init(struct dvb_vb2_ctx *ctx, const char *name, int nonblocking)
 
 	memset(ctx, 0, sizeof(struct dvb_vb2_ctx));
 	q->type = DVB_BUF_TYPE_CAPTURE;
-	/**capture type*/
-	q->is_output = 0;
 	/**only mmap is supported currently*/
 	q->io_modes = VB2_MMAP;
 	q->drv_priv = ctx;
@@ -177,7 +175,6 @@ int dvb_vb2_init(struct dvb_vb2_ctx *ctx, const char *name, int nonblocking)
 	q->ops = &dvb_vb2_qops;
 	q->mem_ops = &vb2_vmalloc_memops;
 	q->buf_ops = &dvb_vb2_buf_ops;
-	q->num_buffers = 0;
 	ret = vb2_core_queue_init(q);
 	if (ret) {
 		ctx->state = DVB_VB2_STATE_NONE;
-- 
2.39.2

Re: [PATCH v15 19/56] media: dvb-core: Do not initialize twice queue num_buffer field

[Andrzej Pietrasiewicz]

W dniu 9.11.2023 o 17:34, Benjamin Gaignard pisze:
> The above memset already zeroed all the ctx fields, it is useless
> to do it here again.
> 
> Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>

Reviewed-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com>

> ---
>   drivers/media/dvb-core/dvb_vb2.c | 3 ---
>   1 file changed, 3 deletions(-)
> 
> diff --git a/drivers/media/dvb-core/dvb_vb2.c b/drivers/media/dvb-core/dvb_vb2.c
> index 3a966fdf814c..167ff82a6fed 100644
> --- a/drivers/media/dvb-core/dvb_vb2.c
> +++ b/drivers/media/dvb-core/dvb_vb2.c
> @@ -167,8 +167,6 @@ int dvb_vb2_init(struct dvb_vb2_ctx *ctx, const char *name, int nonblocking)
>   
>   	memset(ctx, 0, sizeof(struct dvb_vb2_ctx));
>   	q->type = DVB_BUF_TYPE_CAPTURE;
> -	/**capture type*/
> -	q->is_output = 0;
>   	/**only mmap is supported currently*/
>   	q->io_modes = VB2_MMAP;
>   	q->drv_priv = ctx;
> @@ -177,7 +175,6 @@ int dvb_vb2_init(struct dvb_vb2_ctx *ctx, const char *name, int nonblocking)
>   	q->ops = &dvb_vb2_qops;
>   	q->mem_ops = &vb2_vmalloc_memops;
>   	q->buf_ops = &dvb_vb2_buf_ops;
> -	q->num_buffers = 0;
>   	ret = vb2_core_queue_init(q);
>   	if (ret) {
>   		ctx->state = DVB_VB2_STATE_NONE;

[PATCH v15 20/56] media: dvb-frontends: rtl2832: Stop direct calls to queue num_buffers field

[Benjamin Gaignard]

Use vb2_get_num_buffers() to avoid using queue num_buffers field directly.
This allows us to change how the number of buffers is computed in the
future.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>
Reviewed-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com>
CC: Antti Palosaari <crope@iki.fi>
---
 drivers/media/dvb-frontends/rtl2832_sdr.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/media/dvb-frontends/rtl2832_sdr.c b/drivers/media/dvb-frontends/rtl2832_sdr.c
index 02c619e51641..023db6e793f8 100644
--- a/drivers/media/dvb-frontends/rtl2832_sdr.c
+++ b/drivers/media/dvb-frontends/rtl2832_sdr.c
@@ -439,12 +439,13 @@ static int rtl2832_sdr_queue_setup(struct vb2_queue *vq,
 {
 	struct rtl2832_sdr_dev *dev = vb2_get_drv_priv(vq);
 	struct platform_device *pdev = dev->pdev;
+	unsigned int q_num_bufs = vb2_get_num_buffers(vq);
 
 	dev_dbg(&pdev->dev, "nbuffers=%d\n", *nbuffers);
 
 	/* Need at least 8 buffers */
-	if (vq->num_buffers + *nbuffers < 8)
-		*nbuffers = 8 - vq->num_buffers;
+	if (q_num_bufs + *nbuffers < 8)
+		*nbuffers = 8 - q_num_bufs;
 	*nplanes = 1;
 	sizes[0] = PAGE_ALIGN(dev->buffersize);
 	dev_dbg(&pdev->dev, "nbuffers=%d sizes[0]=%d\n", *nbuffers, sizes[0]);
-- 
2.39.2

[PATCH v15 21/56] media: pci: dt3155: Remove useless check

[Benjamin Gaignard]

min_buffers_needed is already set to 2 so remove this useless
check.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>
Reviewed-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com>
---
 drivers/media/pci/dt3155/dt3155.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/media/pci/dt3155/dt3155.c b/drivers/media/pci/dt3155/dt3155.c
index 548156b199cc..d09cde2f6ee4 100644
--- a/drivers/media/pci/dt3155/dt3155.c
+++ b/drivers/media/pci/dt3155/dt3155.c
@@ -128,8 +128,6 @@ dt3155_queue_setup(struct vb2_queue *vq,
 	struct dt3155_priv *pd = vb2_get_drv_priv(vq);
 	unsigned size = pd->width * pd->height;
 
-	if (vq->num_buffers + *nbuffers < 2)
-		*nbuffers = 2 - vq->num_buffers;
 	if (*num_planes)
 		return sizes[0] < size ? -EINVAL : 0;
 	*num_planes = 1;
-- 
2.39.2

[PATCH v15 22/56] media: pci: tw686x: Stop direct calls to queue num_buffers field

[Benjamin Gaignard]

Use vb2_get_num_buffers() to avoid using queue num_buffers field directly.
This allows us to change how the number of buffers is computed in the
future.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>
Reviewed-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com>
CC: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>
---
 drivers/media/pci/tw686x/tw686x-video.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/media/pci/tw686x/tw686x-video.c b/drivers/media/pci/tw686x/tw686x-video.c
index 3ebf7a2c95f0..6bc6d143d18c 100644
--- a/drivers/media/pci/tw686x/tw686x-video.c
+++ b/drivers/media/pci/tw686x/tw686x-video.c
@@ -423,6 +423,7 @@ static int tw686x_queue_setup(struct vb2_queue *vq,
 			      unsigned int sizes[], struct device *alloc_devs[])
 {
 	struct tw686x_video_channel *vc = vb2_get_drv_priv(vq);
+	unsigned int q_num_bufs = vb2_get_num_buffers(vq);
 	unsigned int szimage =
 		(vc->width * vc->height * vc->format->depth) >> 3;
 
@@ -430,8 +431,8 @@ static int tw686x_queue_setup(struct vb2_queue *vq,
 	 * Let's request at least three buffers: two for the
 	 * DMA engine and one for userspace.
 	 */
-	if (vq->num_buffers + *nbuffers < 3)
-		*nbuffers = 3 - vq->num_buffers;
+	if (q_num_bufs + *nbuffers < 3)
+		*nbuffers = 3 - q_num_bufs;
 
 	if (*nplanes) {
 		if (*nplanes != 1 || sizes[0] < szimage)
-- 
2.39.2

[PATCH v15 23/56] media: pci: cx18: Stop direct calls to queue num_buffers field

[Benjamin Gaignard]

Use vb2_get_num_buffers() to avoid using queue num_buffers field directly.
This allows us to change how the number of buffers is computed in the
future.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>
Reviewed-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com>
CC: Sergey Kozlov <serjk@netup.ru>
CC: Abylay Ospan <aospan@netup.ru>
---
 drivers/media/pci/cx18/cx18-streams.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/media/pci/cx18/cx18-streams.c b/drivers/media/pci/cx18/cx18-streams.c
index 597472754c4c..cfbc4a907802 100644
--- a/drivers/media/pci/cx18/cx18-streams.c
+++ b/drivers/media/pci/cx18/cx18-streams.c
@@ -104,6 +104,7 @@ static int cx18_queue_setup(struct vb2_queue *vq,
 			    unsigned int *nbuffers, unsigned int *nplanes,
 			    unsigned int sizes[], struct device *alloc_devs[])
 {
+	unsigned int q_num_bufs = vb2_get_num_buffers(vq);
 	struct cx18_stream *s = vb2_get_drv_priv(vq);
 	struct cx18 *cx = s->cx;
 	unsigned int szimage;
@@ -121,8 +122,8 @@ static int cx18_queue_setup(struct vb2_queue *vq,
 	 * Let's request at least three buffers: two for the
 	 * DMA engine and one for userspace.
 	 */
-	if (vq->num_buffers + *nbuffers < 3)
-		*nbuffers = 3 - vq->num_buffers;
+	if (q_num_bufs + *nbuffers < 3)
+		*nbuffers = 3 - q_num_bufs;
 
 	if (*nplanes) {
 		if (*nplanes != 1 || sizes[0] < szimage)
-- 
2.39.2

[PATCH v15 24/56] media: pci: netup_unidvb: Stop direct calls to queue num_buffers field

[Benjamin Gaignard]

Use vb2_get_num_buffers() to avoid using queue num_buffers field directly.
This allows us to change how the number of buffers is computed in the
future.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>
Reviewed-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com>
CC: Sergey Kozlov <serjk@netup.ru>
CC: Abylay Ospan <aospan@netup.ru>
---
 drivers/media/pci/netup_unidvb/netup_unidvb_core.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/media/pci/netup_unidvb/netup_unidvb_core.c b/drivers/media/pci/netup_unidvb/netup_unidvb_core.c
index d85bfbb77a25..557985ba25db 100644
--- a/drivers/media/pci/netup_unidvb/netup_unidvb_core.c
+++ b/drivers/media/pci/netup_unidvb/netup_unidvb_core.c
@@ -293,12 +293,13 @@ static int netup_unidvb_queue_setup(struct vb2_queue *vq,
 				    struct device *alloc_devs[])
 {
 	struct netup_dma *dma = vb2_get_drv_priv(vq);
+	unsigned int q_num_bufs = vb2_get_num_buffers(vq);
 
 	dev_dbg(&dma->ndev->pci_dev->dev, "%s()\n", __func__);
 
 	*nplanes = 1;
-	if (vq->num_buffers + *nbuffers < VIDEO_MAX_FRAME)
-		*nbuffers = VIDEO_MAX_FRAME - vq->num_buffers;
+	if (q_num_bufs + *nbuffers < VIDEO_MAX_FRAME)
+		*nbuffers = VIDEO_MAX_FRAME - q_num_bufs;
 	sizes[0] = PAGE_ALIGN(NETUP_DMA_PACKETS_COUNT * 188);
 	dev_dbg(&dma->ndev->pci_dev->dev, "%s() nbuffers=%d sizes[0]=%d\n",
 		__func__, *nbuffers, sizes[0]);
-- 
2.39.2

[PATCH v15 25/56] media: pci: tw68: Stop direct calls to queue num_buffers field

[Benjamin Gaignard]

Use vb2_get_num_buffers() to avoid using queue num_buffers field directly.
This allows us to change how the number of buffers is computed in the
future.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>
CC: Fabrizio Castro <fabrizio.castro.jz@renesas.com>
---
 drivers/media/pci/tw68/tw68-video.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/media/pci/tw68/tw68-video.c b/drivers/media/pci/tw68/tw68-video.c
index 773a18702d36..79b627ebc92a 100644
--- a/drivers/media/pci/tw68/tw68-video.c
+++ b/drivers/media/pci/tw68/tw68-video.c
@@ -360,13 +360,14 @@ static int tw68_queue_setup(struct vb2_queue *q,
 			   unsigned int sizes[], struct device *alloc_devs[])
 {
 	struct tw68_dev *dev = vb2_get_drv_priv(q);
-	unsigned tot_bufs = q->num_buffers + *num_buffers;
+	unsigned int q_num_bufs = vb2_get_num_buffers(q);
+	unsigned int tot_bufs = q_num_bufs + *num_buffers;
 	unsigned size = (dev->fmt->depth * dev->width * dev->height) >> 3;
 
 	if (tot_bufs < 2)
 		tot_bufs = 2;
 	tot_bufs = tw68_buffer_count(size, tot_bufs);
-	*num_buffers = tot_bufs - q->num_buffers;
+	*num_buffers = tot_bufs - q_num_bufs;
 	/*
 	 * We allow create_bufs, but only if the sizeimage is >= as the
 	 * current sizeimage. The tw68_buffer_count calculation becomes quite
-- 
2.39.2

Re: [PATCH v15 25/56] media: pci: tw68: Stop direct calls to queue num_buffers field

[Andrzej Pietrasiewicz]

W dniu 9.11.2023 o 17:34, Benjamin Gaignard pisze:
> Use vb2_get_num_buffers() to avoid using queue num_buffers field directly.
> This allows us to change how the number of buffers is computed in the
> future.
> 
> Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>

Reviewed-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com>

> CC: Fabrizio Castro <fabrizio.castro.jz@renesas.com>
> ---
>   drivers/media/pci/tw68/tw68-video.c | 5 +++--
>   1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/media/pci/tw68/tw68-video.c b/drivers/media/pci/tw68/tw68-video.c
> index 773a18702d36..79b627ebc92a 100644
> --- a/drivers/media/pci/tw68/tw68-video.c
> +++ b/drivers/media/pci/tw68/tw68-video.c
> @@ -360,13 +360,14 @@ static int tw68_queue_setup(struct vb2_queue *q,
>   			   unsigned int sizes[], struct device *alloc_devs[])
>   {
>   	struct tw68_dev *dev = vb2_get_drv_priv(q);
> -	unsigned tot_bufs = q->num_buffers + *num_buffers;
> +	unsigned int q_num_bufs = vb2_get_num_buffers(q);
> +	unsigned int tot_bufs = q_num_bufs + *num_buffers;
>   	unsigned size = (dev->fmt->depth * dev->width * dev->height) >> 3;
>   
>   	if (tot_bufs < 2)
>   		tot_bufs = 2;
>   	tot_bufs = tw68_buffer_count(size, tot_bufs);
> -	*num_buffers = tot_bufs - q->num_buffers;
> +	*num_buffers = tot_bufs - q_num_bufs;
>   	/*
>   	 * We allow create_bufs, but only if the sizeimage is >= as the
>   	 * current sizeimage. The tw68_buffer_count calculation becomes quite

[PATCH v15 26/56] media: i2c: video-i2c: Stop direct calls to queue num_buffers field

[Benjamin Gaignard]

Use vb2_get_num_buffers() to avoid using queue num_buffers field directly.
This allows us to change how the number of buffers is computed in the
future.
Fix the number of buffers computation at the same time.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>
CC: Matt Ranostay <matt.ranostay@konsulko.com>
---
 drivers/media/i2c/video-i2c.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/media/i2c/video-i2c.c b/drivers/media/i2c/video-i2c.c
index 178bd06cc2ed..ebf2ac98a068 100644
--- a/drivers/media/i2c/video-i2c.c
+++ b/drivers/media/i2c/video-i2c.c
@@ -405,9 +405,10 @@ static int queue_setup(struct vb2_queue *vq,
 {
 	struct video_i2c_data *data = vb2_get_drv_priv(vq);
 	unsigned int size = data->chip->buffer_size;
+	unsigned int q_num_bufs = vb2_get_num_buffers(vq);
 
-	if (vq->num_buffers + *nbuffers < 2)
-		*nbuffers = 2;
+	if (q_num_bufs + *nbuffers < 2)
+		*nbuffers = 2 - q_num_bufs;
 
 	if (*nplanes)
 		return sizes[0] < size ? -EINVAL : 0;
-- 
2.39.2

Re: [PATCH v15 26/56] media: i2c: video-i2c: Stop direct calls to queue num_buffers field

[Andrzej Pietrasiewicz]

W dniu 9.11.2023 o 17:34, Benjamin Gaignard pisze:
> Use vb2_get_num_buffers() to avoid using queue num_buffers field directly.
> This allows us to change how the number of buffers is computed in the
> future.
> Fix the number of buffers computation at the same time.
> 
> Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>

Reviewed-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com>

> CC: Matt Ranostay <matt.ranostay@konsulko.com>
> ---
>   drivers/media/i2c/video-i2c.c | 5 +++--
>   1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/media/i2c/video-i2c.c b/drivers/media/i2c/video-i2c.c
> index 178bd06cc2ed..ebf2ac98a068 100644
> --- a/drivers/media/i2c/video-i2c.c
> +++ b/drivers/media/i2c/video-i2c.c
> @@ -405,9 +405,10 @@ static int queue_setup(struct vb2_queue *vq,
>   {
>   	struct video_i2c_data *data = vb2_get_drv_priv(vq);
>   	unsigned int size = data->chip->buffer_size;
> +	unsigned int q_num_bufs = vb2_get_num_buffers(vq);
>   
> -	if (vq->num_buffers + *nbuffers < 2)
> -		*nbuffers = 2;
> +	if (q_num_bufs + *nbuffers < 2)
> +		*nbuffers = 2 - q_num_bufs;
>   
>   	if (*nplanes)
>   		return sizes[0] < size ? -EINVAL : 0;

[PATCH v15 27/56] media: coda: Stop direct calls to queue num_buffers field

[Benjamin Gaignard]

Use vb2_get_num_buffers() to avoid using queue num_buffers field directly.
This allows us to change how the number of buffers is computed in the
future.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>
Reviewed-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com>
CC: Philipp Zabel <p.zabel@pengutronix.de>
---
 drivers/media/platform/chips-media/coda-common.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/media/platform/chips-media/coda-common.c b/drivers/media/platform/chips-media/coda-common.c
index cc4892129aaf..f1d85758f6dd 100644
--- a/drivers/media/platform/chips-media/coda-common.c
+++ b/drivers/media/platform/chips-media/coda-common.c
@@ -794,7 +794,7 @@ static int coda_s_fmt(struct coda_ctx *ctx, struct v4l2_format *f,
 
 	if (vb2_is_busy(vq)) {
 		v4l2_err(&ctx->dev->v4l2_dev, "%s: %s queue busy: %d\n",
-			 __func__, v4l2_type_names[f->type], vq->num_buffers);
+			 __func__, v4l2_type_names[f->type], vb2_get_num_buffers(vq));
 		return -EBUSY;
 	}
 
-- 
2.39.2

[PATCH v15 28/56] media: nxp: Stop direct calls to queue num_buffers field

[Benjamin Gaignard]

Use vb2_get_num_buffers() to avoid using queue num_buffers field directly.
This allows us to change how the number of buffers is computed in the
future.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>
Reviewed-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com>
CC: Rui Miguel Silva <rmfrfs@gmail.com>
CC: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
CC: Martin Kepplinger <martink@posteo.de>
---
 drivers/media/platform/nxp/imx7-media-csi.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/media/platform/nxp/imx7-media-csi.c b/drivers/media/platform/nxp/imx7-media-csi.c
index 15049c6aab37..4c467fb82789 100644
--- a/drivers/media/platform/nxp/imx7-media-csi.c
+++ b/drivers/media/platform/nxp/imx7-media-csi.c
@@ -1245,6 +1245,7 @@ static int imx7_csi_video_queue_setup(struct vb2_queue *vq,
 				      struct device *alloc_devs[])
 {
 	struct imx7_csi *csi = vb2_get_drv_priv(vq);
+	unsigned int q_num_bufs = vb2_get_num_buffers(vq);
 	struct v4l2_pix_format *pix = &csi->vdev_fmt;
 	unsigned int count = *nbuffers;
 
@@ -1254,14 +1255,14 @@ static int imx7_csi_video_queue_setup(struct vb2_queue *vq,
 	if (*nplanes) {
 		if (*nplanes != 1 || sizes[0] < pix->sizeimage)
 			return -EINVAL;
-		count += vq->num_buffers;
+		count += q_num_bufs;
 	}
 
 	count = min_t(__u32, IMX7_CSI_VIDEO_MEM_LIMIT / pix->sizeimage, count);
 
 	if (*nplanes)
-		*nbuffers = (count < vq->num_buffers) ? 0 :
-			count - vq->num_buffers;
+		*nbuffers = (count < q_num_bufs) ? 0 :
+			count - q_num_bufs;
 	else
 		*nbuffers = count;
 
-- 
2.39.2

[PATCH v15 29/56] media: verisilicon: Stop direct calls to queue num_buffers field

[Benjamin Gaignard]

Use vb2_get_num_buffers() to avoid using queue num_buffers field directly.
This allows us to change how the number of buffers is computed in the
future.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>
Reviewed-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com>
CC: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>
---
 drivers/media/platform/verisilicon/hantro_postproc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/media/platform/verisilicon/hantro_postproc.c b/drivers/media/platform/verisilicon/hantro_postproc.c
index 64d6fb852ae9..8f8f17e671ce 100644
--- a/drivers/media/platform/verisilicon/hantro_postproc.c
+++ b/drivers/media/platform/verisilicon/hantro_postproc.c
@@ -195,7 +195,7 @@ int hantro_postproc_alloc(struct hantro_ctx *ctx)
 	struct hantro_dev *vpu = ctx->dev;
 	struct v4l2_m2m_ctx *m2m_ctx = ctx->fh.m2m_ctx;
 	struct vb2_queue *cap_queue = &m2m_ctx->cap_q_ctx.q;
-	unsigned int num_buffers = cap_queue->num_buffers;
+	unsigned int num_buffers = vb2_get_num_buffers(cap_queue);
 	struct v4l2_pix_format_mplane pix_mp;
 	const struct hantro_fmt *fmt;
 	unsigned int i, buf_size;
-- 
2.39.2

[PATCH v15 30/56] media: test-drivers: Stop direct calls to queue num_buffers field

[Benjamin Gaignard]

Use vb2_get_num_buffers() to avoid using queue num_buffers field directly.
This allows us to change how the number of buffers is computed in the
future.
If 'min_buffers_needed' is set remove useless checks in queue setup
functions.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>
CC: Daniel Almeida <daniel.almeida@collabora.com>
---
 drivers/media/test-drivers/visl/visl-dec.c         | 4 ++--
 drivers/media/test-drivers/vivid/vivid-meta-cap.c  | 3 ---
 drivers/media/test-drivers/vivid/vivid-meta-out.c  | 5 +++--
 drivers/media/test-drivers/vivid/vivid-touch-cap.c | 5 +++--
 drivers/media/test-drivers/vivid/vivid-vbi-cap.c   | 3 ---
 drivers/media/test-drivers/vivid/vivid-vbi-out.c   | 3 ---
 drivers/media/test-drivers/vivid/vivid-vid-cap.c   | 3 ---
 drivers/media/test-drivers/vivid/vivid-vid-out.c   | 5 +----
 8 files changed, 9 insertions(+), 22 deletions(-)

diff --git a/drivers/media/test-drivers/visl/visl-dec.c b/drivers/media/test-drivers/visl/visl-dec.c
index ba20ea998d19..4672dc5e52bb 100644
--- a/drivers/media/test-drivers/visl/visl-dec.c
+++ b/drivers/media/test-drivers/visl/visl-dec.c
@@ -287,7 +287,7 @@ static void visl_tpg_fill(struct visl_ctx *ctx, struct visl_run *run)
 	frame_dprintk(ctx->dev, run->dst->sequence, "%s\n", buf);
 
 	len = 0;
-	for (i = 0; i < out_q->num_buffers; i++) {
+	for (i = 0; i < vb2_get_num_buffers(out_q); i++) {
 		char entry[] = "index: %u, state: %s, request_fd: %d, ";
 		u32 old_len = len;
 		struct vb2_buffer *vb2;
@@ -347,7 +347,7 @@ static void visl_tpg_fill(struct visl_ctx *ctx, struct visl_run *run)
 	frame_dprintk(ctx->dev, run->dst->sequence, "%s\n", buf);
 
 	len = 0;
-	for (i = 0; i < cap_q->num_buffers; i++) {
+	for (i = 0; i < vb2_get_num_buffers(cap_q); i++) {
 		u32 old_len = len;
 		struct vb2_buffer *vb2;
 		char *q_status;
diff --git a/drivers/media/test-drivers/vivid/vivid-meta-cap.c b/drivers/media/test-drivers/vivid/vivid-meta-cap.c
index 780f96860a6d..0a718d037e59 100644
--- a/drivers/media/test-drivers/vivid/vivid-meta-cap.c
+++ b/drivers/media/test-drivers/vivid/vivid-meta-cap.c
@@ -30,9 +30,6 @@ static int meta_cap_queue_setup(struct vb2_queue *vq, unsigned int *nbuffers,
 		sizes[0] = size;
 	}
 
-	if (vq->num_buffers + *nbuffers < 2)
-		*nbuffers = 2 - vq->num_buffers;
-
 	*nplanes = 1;
 	return 0;
 }
diff --git a/drivers/media/test-drivers/vivid/vivid-meta-out.c b/drivers/media/test-drivers/vivid/vivid-meta-out.c
index 95835b52b58f..4a569a6e58be 100644
--- a/drivers/media/test-drivers/vivid/vivid-meta-out.c
+++ b/drivers/media/test-drivers/vivid/vivid-meta-out.c
@@ -18,6 +18,7 @@ static int meta_out_queue_setup(struct vb2_queue *vq, unsigned int *nbuffers,
 				struct device *alloc_devs[])
 {
 	struct vivid_dev *dev = vb2_get_drv_priv(vq);
+	unsigned int q_num_bufs = vb2_get_num_buffers(vq);
 	unsigned int size =  sizeof(struct vivid_meta_out_buf);
 
 	if (!vivid_is_webcam(dev))
@@ -30,8 +31,8 @@ static int meta_out_queue_setup(struct vb2_queue *vq, unsigned int *nbuffers,
 		sizes[0] = size;
 	}
 
-	if (vq->num_buffers + *nbuffers < 2)
-		*nbuffers = 2 - vq->num_buffers;
+	if (q_num_bufs + *nbuffers < 2)
+		*nbuffers = 2 - q_num_bufs;
 
 	*nplanes = 1;
 	return 0;
diff --git a/drivers/media/test-drivers/vivid/vivid-touch-cap.c b/drivers/media/test-drivers/vivid/vivid-touch-cap.c
index c7f6e23df51e..4b3c6ea0afde 100644
--- a/drivers/media/test-drivers/vivid/vivid-touch-cap.c
+++ b/drivers/media/test-drivers/vivid/vivid-touch-cap.c
@@ -13,6 +13,7 @@ static int touch_cap_queue_setup(struct vb2_queue *vq, unsigned int *nbuffers,
 				 struct device *alloc_devs[])
 {
 	struct vivid_dev *dev = vb2_get_drv_priv(vq);
+	unsigned int q_num_bufs = vb2_get_num_buffers(vq);
 	struct v4l2_pix_format *f = &dev->tch_format;
 	unsigned int size = f->sizeimage;
 
@@ -23,8 +24,8 @@ static int touch_cap_queue_setup(struct vb2_queue *vq, unsigned int *nbuffers,
 		sizes[0] = size;
 	}
 
-	if (vq->num_buffers + *nbuffers < 2)
-		*nbuffers = 2 - vq->num_buffers;
+	if (q_num_bufs + *nbuffers < 2)
+		*nbuffers = 2 - q_num_bufs;
 
 	*nplanes = 1;
 	return 0;
diff --git a/drivers/media/test-drivers/vivid/vivid-vbi-cap.c b/drivers/media/test-drivers/vivid/vivid-vbi-cap.c
index b65b02eeeb97..3840b3a664ac 100644
--- a/drivers/media/test-drivers/vivid/vivid-vbi-cap.c
+++ b/drivers/media/test-drivers/vivid/vivid-vbi-cap.c
@@ -134,9 +134,6 @@ static int vbi_cap_queue_setup(struct vb2_queue *vq,
 
 	sizes[0] = size;
 
-	if (vq->num_buffers + *nbuffers < 2)
-		*nbuffers = 2 - vq->num_buffers;
-
 	*nplanes = 1;
 	return 0;
 }
diff --git a/drivers/media/test-drivers/vivid/vivid-vbi-out.c b/drivers/media/test-drivers/vivid/vivid-vbi-out.c
index cd56476902a2..434a10676417 100644
--- a/drivers/media/test-drivers/vivid/vivid-vbi-out.c
+++ b/drivers/media/test-drivers/vivid/vivid-vbi-out.c
@@ -30,9 +30,6 @@ static int vbi_out_queue_setup(struct vb2_queue *vq,
 
 	sizes[0] = size;
 
-	if (vq->num_buffers + *nbuffers < 2)
-		*nbuffers = 2 - vq->num_buffers;
-
 	*nplanes = 1;
 	return 0;
 }
diff --git a/drivers/media/test-drivers/vivid/vivid-vid-cap.c b/drivers/media/test-drivers/vivid/vivid-vid-cap.c
index 3a06df35a2d7..2804975fe278 100644
--- a/drivers/media/test-drivers/vivid/vivid-vid-cap.c
+++ b/drivers/media/test-drivers/vivid/vivid-vid-cap.c
@@ -117,9 +117,6 @@ static int vid_cap_queue_setup(struct vb2_queue *vq,
 					dev->fmt_cap->data_offset[p];
 	}
 
-	if (vq->num_buffers + *nbuffers < 2)
-		*nbuffers = 2 - vq->num_buffers;
-
 	*nplanes = buffers;
 
 	dprintk(dev, 1, "%s: count=%d\n", __func__, *nbuffers);
diff --git a/drivers/media/test-drivers/vivid/vivid-vid-out.c b/drivers/media/test-drivers/vivid/vivid-vid-out.c
index 184a6df2c29f..1653b2988f7e 100644
--- a/drivers/media/test-drivers/vivid/vivid-vid-out.c
+++ b/drivers/media/test-drivers/vivid/vivid-vid-out.c
@@ -73,12 +73,9 @@ static int vid_out_queue_setup(struct vb2_queue *vq,
 				       vfmt->data_offset[p] : size;
 	}
 
-	if (vq->num_buffers + *nbuffers < 2)
-		*nbuffers = 2 - vq->num_buffers;
-
 	*nplanes = planes;
 
-	dprintk(dev, 1, "%s: count=%d\n", __func__, *nbuffers);
+	dprintk(dev, 1, "%s: count=%u\n", __func__, *nbuffers);
 	for (p = 0; p < planes; p++)
 		dprintk(dev, 1, "%s: size[%u]=%u\n", __func__, p, sizes[p]);
 	return 0;
-- 
2.39.2

Re: [PATCH v15 30/56] media: test-drivers: Stop direct calls to queue num_buffers field

[Andrzej Pietrasiewicz]

Hi Benjamin,

W dniu 9.11.2023 o 17:34, Benjamin Gaignard pisze:
> Use vb2_get_num_buffers() to avoid using queue num_buffers field directly.
> This allows us to change how the number of buffers is computed in the
> future.
> If 'min_buffers_needed' is set remove useless checks in queue setup
> functions.
> 
> Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>
> CC: Daniel Almeida <daniel.almeida@collabora.com>
> ---
>   drivers/media/test-drivers/visl/visl-dec.c         | 4 ++--
>   drivers/media/test-drivers/vivid/vivid-meta-cap.c  | 3 ---
>   drivers/media/test-drivers/vivid/vivid-meta-out.c  | 5 +++--
>   drivers/media/test-drivers/vivid/vivid-touch-cap.c | 5 +++--
>   drivers/media/test-drivers/vivid/vivid-vbi-cap.c   | 3 ---
>   drivers/media/test-drivers/vivid/vivid-vbi-out.c   | 3 ---
>   drivers/media/test-drivers/vivid/vivid-vid-cap.c   | 3 ---
>   drivers/media/test-drivers/vivid/vivid-vid-out.c   | 5 +----
>   8 files changed, 9 insertions(+), 22 deletions(-)
> 
> diff --git a/drivers/media/test-drivers/visl/visl-dec.c b/drivers/media/test-drivers/visl/visl-dec.c
> index ba20ea998d19..4672dc5e52bb 100644
> --- a/drivers/media/test-drivers/visl/visl-dec.c
> +++ b/drivers/media/test-drivers/visl/visl-dec.c
> @@ -287,7 +287,7 @@ static void visl_tpg_fill(struct visl_ctx *ctx, struct visl_run *run)
>   	frame_dprintk(ctx->dev, run->dst->sequence, "%s\n", buf);
>   
>   	len = 0;
> -	for (i = 0; i < out_q->num_buffers; i++) {
> +	for (i = 0; i < vb2_get_num_buffers(out_q); i++) {
>   		char entry[] = "index: %u, state: %s, request_fd: %d, ";
>   		u32 old_len = len;
>   		struct vb2_buffer *vb2;
> @@ -347,7 +347,7 @@ static void visl_tpg_fill(struct visl_ctx *ctx, struct visl_run *run)
>   	frame_dprintk(ctx->dev, run->dst->sequence, "%s\n", buf);
>   
>   	len = 0;
> -	for (i = 0; i < cap_q->num_buffers; i++) {
> +	for (i = 0; i < vb2_get_num_buffers(cap_q); i++) {
>   		u32 old_len = len;
>   		struct vb2_buffer *vb2;
>   		char *q_status;
> diff --git a/drivers/media/test-drivers/vivid/vivid-meta-cap.c b/drivers/media/test-drivers/vivid/vivid-meta-cap.c
> index 780f96860a6d..0a718d037e59 100644
> --- a/drivers/media/test-drivers/vivid/vivid-meta-cap.c
> +++ b/drivers/media/test-drivers/vivid/vivid-meta-cap.c
> @@ -30,9 +30,6 @@ static int meta_cap_queue_setup(struct vb2_queue *vq, unsigned int *nbuffers,
>   		sizes[0] = size;
>   	}
>   
> -	if (vq->num_buffers + *nbuffers < 2)
> -		*nbuffers = 2 - vq->num_buffers;
> -
>   	*nplanes = 1;
>   	return 0;
>   }
> diff --git a/drivers/media/test-drivers/vivid/vivid-meta-out.c b/drivers/media/test-drivers/vivid/vivid-meta-out.c
> index 95835b52b58f..4a569a6e58be 100644
> --- a/drivers/media/test-drivers/vivid/vivid-meta-out.c
> +++ b/drivers/media/test-drivers/vivid/vivid-meta-out.c
> @@ -18,6 +18,7 @@ static int meta_out_queue_setup(struct vb2_queue *vq, unsigned int *nbuffers,
>   				struct device *alloc_devs[])
>   {
>   	struct vivid_dev *dev = vb2_get_drv_priv(vq);
> +	unsigned int q_num_bufs = vb2_get_num_buffers(vq);
>   	unsigned int size =  sizeof(struct vivid_meta_out_buf);
>   
>   	if (!vivid_is_webcam(dev))
> @@ -30,8 +31,8 @@ static int meta_out_queue_setup(struct vb2_queue *vq, unsigned int *nbuffers,
>   		sizes[0] = size;
>   	}
>   
> -	if (vq->num_buffers + *nbuffers < 2)
> -		*nbuffers = 2 - vq->num_buffers;
> +	if (q_num_bufs + *nbuffers < 2)
> +		*nbuffers = 2 - q_num_bufs;
>   
>   	*nplanes = 1;
>   	return 0;
> diff --git a/drivers/media/test-drivers/vivid/vivid-touch-cap.c b/drivers/media/test-drivers/vivid/vivid-touch-cap.c
> index c7f6e23df51e..4b3c6ea0afde 100644
> --- a/drivers/media/test-drivers/vivid/vivid-touch-cap.c
> +++ b/drivers/media/test-drivers/vivid/vivid-touch-cap.c
> @@ -13,6 +13,7 @@ static int touch_cap_queue_setup(struct vb2_queue *vq, unsigned int *nbuffers,
>   				 struct device *alloc_devs[])
>   {
>   	struct vivid_dev *dev = vb2_get_drv_priv(vq);
> +	unsigned int q_num_bufs = vb2_get_num_buffers(vq);
>   	struct v4l2_pix_format *f = &dev->tch_format;
>   	unsigned int size = f->sizeimage;
>   
> @@ -23,8 +24,8 @@ static int touch_cap_queue_setup(struct vb2_queue *vq, unsigned int *nbuffers,
>   		sizes[0] = size;
>   	}
>   
> -	if (vq->num_buffers + *nbuffers < 2)
> -		*nbuffers = 2 - vq->num_buffers;
> +	if (q_num_bufs + *nbuffers < 2)
> +		*nbuffers = 2 - q_num_bufs;
>   
>   	*nplanes = 1;
>   	return 0;
> diff --git a/drivers/media/test-drivers/vivid/vivid-vbi-cap.c b/drivers/media/test-drivers/vivid/vivid-vbi-cap.c
> index b65b02eeeb97..3840b3a664ac 100644
> --- a/drivers/media/test-drivers/vivid/vivid-vbi-cap.c
> +++ b/drivers/media/test-drivers/vivid/vivid-vbi-cap.c
> @@ -134,9 +134,6 @@ static int vbi_cap_queue_setup(struct vb2_queue *vq,
>   
>   	sizes[0] = size;
>   
> -	if (vq->num_buffers + *nbuffers < 2)
> -		*nbuffers = 2 - vq->num_buffers;
> -
>   	*nplanes = 1;
>   	return 0;
>   }
> diff --git a/drivers/media/test-drivers/vivid/vivid-vbi-out.c b/drivers/media/test-drivers/vivid/vivid-vbi-out.c
> index cd56476902a2..434a10676417 100644
> --- a/drivers/media/test-drivers/vivid/vivid-vbi-out.c
> +++ b/drivers/media/test-drivers/vivid/vivid-vbi-out.c
> @@ -30,9 +30,6 @@ static int vbi_out_queue_setup(struct vb2_queue *vq,
>   
>   	sizes[0] = size;
>   
> -	if (vq->num_buffers + *nbuffers < 2)
> -		*nbuffers = 2 - vq->num_buffers;
> -
>   	*nplanes = 1;
>   	return 0;
>   }
> diff --git a/drivers/media/test-drivers/vivid/vivid-vid-cap.c b/drivers/media/test-drivers/vivid/vivid-vid-cap.c
> index 3a06df35a2d7..2804975fe278 100644
> --- a/drivers/media/test-drivers/vivid/vivid-vid-cap.c
> +++ b/drivers/media/test-drivers/vivid/vivid-vid-cap.c
> @@ -117,9 +117,6 @@ static int vid_cap_queue_setup(struct vb2_queue *vq,
>   					dev->fmt_cap->data_offset[p];
>   	}
>   
> -	if (vq->num_buffers + *nbuffers < 2)
> -		*nbuffers = 2 - vq->num_buffers;
> -
>   	*nplanes = buffers;
>   
>   	dprintk(dev, 1, "%s: count=%d\n", __func__, *nbuffers);

here the format specifier for "*nbuffers" is "%d"...

> diff --git a/drivers/media/test-drivers/vivid/vivid-vid-out.c b/drivers/media/test-drivers/vivid/vivid-vid-out.c
> index 184a6df2c29f..1653b2988f7e 100644
> --- a/drivers/media/test-drivers/vivid/vivid-vid-out.c
> +++ b/drivers/media/test-drivers/vivid/vivid-vid-out.c
> @@ -73,12 +73,9 @@ static int vid_out_queue_setup(struct vb2_queue *vq,
>   				       vfmt->data_offset[p] : size;
>   	}
>   
> -	if (vq->num_buffers + *nbuffers < 2)
> -		*nbuffers = 2 - vq->num_buffers;
> -
>   	*nplanes = planes;
>   
> -	dprintk(dev, 1, "%s: count=%d\n", __func__, *nbuffers);
> +	dprintk(dev, 1, "%s: count=%u\n", __func__, *nbuffers);

... but here you change it to "%u". Is there a reason for these two to be
different? I didn't notice it in the previous version but now it stands out
clearly. Probably you changed to %u because of the type returned by
vb2_get_num_buffers(). And, actually, *nbuffers _is_ unsigned, too.

Regards,

Andrzej

>   	for (p = 0; p < planes; p++)
>   		dprintk(dev, 1, "%s: size[%u]=%u\n", __func__, p, sizes[p]);
>   	return 0;

Re: [PATCH v15 30/56] media: test-drivers: Stop direct calls to queue num_buffers field

[Benjamin Gaignard]

Le 10/11/2023 à 10:35, Andrzej Pietrasiewicz a écrit :
> Hi Benjamin,
>
> W dniu 9.11.2023 o 17:34, Benjamin Gaignard pisze:
>> Use vb2_get_num_buffers() to avoid using queue num_buffers field 
>> directly.
>> This allows us to change how the number of buffers is computed in the
>> future.
>> If 'min_buffers_needed' is set remove useless checks in queue setup
>> functions.
>>
>> Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>
>> CC: Daniel Almeida <daniel.almeida@collabora.com>
>> ---
>>   drivers/media/test-drivers/visl/visl-dec.c         | 4 ++--
>>   drivers/media/test-drivers/vivid/vivid-meta-cap.c  | 3 ---
>>   drivers/media/test-drivers/vivid/vivid-meta-out.c  | 5 +++--
>>   drivers/media/test-drivers/vivid/vivid-touch-cap.c | 5 +++--
>>   drivers/media/test-drivers/vivid/vivid-vbi-cap.c   | 3 ---
>>   drivers/media/test-drivers/vivid/vivid-vbi-out.c   | 3 ---
>>   drivers/media/test-drivers/vivid/vivid-vid-cap.c   | 3 ---
>>   drivers/media/test-drivers/vivid/vivid-vid-out.c   | 5 +----
>>   8 files changed, 9 insertions(+), 22 deletions(-)
>>
>> diff --git a/drivers/media/test-drivers/visl/visl-dec.c 
>> b/drivers/media/test-drivers/visl/visl-dec.c
>> index ba20ea998d19..4672dc5e52bb 100644
>> --- a/drivers/media/test-drivers/visl/visl-dec.c
>> +++ b/drivers/media/test-drivers/visl/visl-dec.c
>> @@ -287,7 +287,7 @@ static void visl_tpg_fill(struct visl_ctx *ctx, 
>> struct visl_run *run)
>>       frame_dprintk(ctx->dev, run->dst->sequence, "%s\n", buf);
>>         len = 0;
>> -    for (i = 0; i < out_q->num_buffers; i++) {
>> +    for (i = 0; i < vb2_get_num_buffers(out_q); i++) {
>>           char entry[] = "index: %u, state: %s, request_fd: %d, ";
>>           u32 old_len = len;
>>           struct vb2_buffer *vb2;
>> @@ -347,7 +347,7 @@ static void visl_tpg_fill(struct visl_ctx *ctx, 
>> struct visl_run *run)
>>       frame_dprintk(ctx->dev, run->dst->sequence, "%s\n", buf);
>>         len = 0;
>> -    for (i = 0; i < cap_q->num_buffers; i++) {
>> +    for (i = 0; i < vb2_get_num_buffers(cap_q); i++) {
>>           u32 old_len = len;
>>           struct vb2_buffer *vb2;
>>           char *q_status;
>> diff --git a/drivers/media/test-drivers/vivid/vivid-meta-cap.c 
>> b/drivers/media/test-drivers/vivid/vivid-meta-cap.c
>> index 780f96860a6d..0a718d037e59 100644
>> --- a/drivers/media/test-drivers/vivid/vivid-meta-cap.c
>> +++ b/drivers/media/test-drivers/vivid/vivid-meta-cap.c
>> @@ -30,9 +30,6 @@ static int meta_cap_queue_setup(struct vb2_queue 
>> *vq, unsigned int *nbuffers,
>>           sizes[0] = size;
>>       }
>>   -    if (vq->num_buffers + *nbuffers < 2)
>> -        *nbuffers = 2 - vq->num_buffers;
>> -
>>       *nplanes = 1;
>>       return 0;
>>   }
>> diff --git a/drivers/media/test-drivers/vivid/vivid-meta-out.c 
>> b/drivers/media/test-drivers/vivid/vivid-meta-out.c
>> index 95835b52b58f..4a569a6e58be 100644
>> --- a/drivers/media/test-drivers/vivid/vivid-meta-out.c
>> +++ b/drivers/media/test-drivers/vivid/vivid-meta-out.c
>> @@ -18,6 +18,7 @@ static int meta_out_queue_setup(struct vb2_queue 
>> *vq, unsigned int *nbuffers,
>>                   struct device *alloc_devs[])
>>   {
>>       struct vivid_dev *dev = vb2_get_drv_priv(vq);
>> +    unsigned int q_num_bufs = vb2_get_num_buffers(vq);
>>       unsigned int size =  sizeof(struct vivid_meta_out_buf);
>>         if (!vivid_is_webcam(dev))
>> @@ -30,8 +31,8 @@ static int meta_out_queue_setup(struct vb2_queue 
>> *vq, unsigned int *nbuffers,
>>           sizes[0] = size;
>>       }
>>   -    if (vq->num_buffers + *nbuffers < 2)
>> -        *nbuffers = 2 - vq->num_buffers;
>> +    if (q_num_bufs + *nbuffers < 2)
>> +        *nbuffers = 2 - q_num_bufs;
>>         *nplanes = 1;
>>       return 0;
>> diff --git a/drivers/media/test-drivers/vivid/vivid-touch-cap.c 
>> b/drivers/media/test-drivers/vivid/vivid-touch-cap.c
>> index c7f6e23df51e..4b3c6ea0afde 100644
>> --- a/drivers/media/test-drivers/vivid/vivid-touch-cap.c
>> +++ b/drivers/media/test-drivers/vivid/vivid-touch-cap.c
>> @@ -13,6 +13,7 @@ static int touch_cap_queue_setup(struct vb2_queue 
>> *vq, unsigned int *nbuffers,
>>                    struct device *alloc_devs[])
>>   {
>>       struct vivid_dev *dev = vb2_get_drv_priv(vq);
>> +    unsigned int q_num_bufs = vb2_get_num_buffers(vq);
>>       struct v4l2_pix_format *f = &dev->tch_format;
>>       unsigned int size = f->sizeimage;
>>   @@ -23,8 +24,8 @@ static int touch_cap_queue_setup(struct vb2_queue 
>> *vq, unsigned int *nbuffers,
>>           sizes[0] = size;
>>       }
>>   -    if (vq->num_buffers + *nbuffers < 2)
>> -        *nbuffers = 2 - vq->num_buffers;
>> +    if (q_num_bufs + *nbuffers < 2)
>> +        *nbuffers = 2 - q_num_bufs;
>>         *nplanes = 1;
>>       return 0;
>> diff --git a/drivers/media/test-drivers/vivid/vivid-vbi-cap.c 
>> b/drivers/media/test-drivers/vivid/vivid-vbi-cap.c
>> index b65b02eeeb97..3840b3a664ac 100644
>> --- a/drivers/media/test-drivers/vivid/vivid-vbi-cap.c
>> +++ b/drivers/media/test-drivers/vivid/vivid-vbi-cap.c
>> @@ -134,9 +134,6 @@ static int vbi_cap_queue_setup(struct vb2_queue *vq,
>>         sizes[0] = size;
>>   -    if (vq->num_buffers + *nbuffers < 2)
>> -        *nbuffers = 2 - vq->num_buffers;
>> -
>>       *nplanes = 1;
>>       return 0;
>>   }
>> diff --git a/drivers/media/test-drivers/vivid/vivid-vbi-out.c 
>> b/drivers/media/test-drivers/vivid/vivid-vbi-out.c
>> index cd56476902a2..434a10676417 100644
>> --- a/drivers/media/test-drivers/vivid/vivid-vbi-out.c
>> +++ b/drivers/media/test-drivers/vivid/vivid-vbi-out.c
>> @@ -30,9 +30,6 @@ static int vbi_out_queue_setup(struct vb2_queue *vq,
>>         sizes[0] = size;
>>   -    if (vq->num_buffers + *nbuffers < 2)
>> -        *nbuffers = 2 - vq->num_buffers;
>> -
>>       *nplanes = 1;
>>       return 0;
>>   }
>> diff --git a/drivers/media/test-drivers/vivid/vivid-vid-cap.c 
>> b/drivers/media/test-drivers/vivid/vivid-vid-cap.c
>> index 3a06df35a2d7..2804975fe278 100644
>> --- a/drivers/media/test-drivers/vivid/vivid-vid-cap.c
>> +++ b/drivers/media/test-drivers/vivid/vivid-vid-cap.c
>> @@ -117,9 +117,6 @@ static int vid_cap_queue_setup(struct vb2_queue *vq,
>>                       dev->fmt_cap->data_offset[p];
>>       }
>>   -    if (vq->num_buffers + *nbuffers < 2)
>> -        *nbuffers = 2 - vq->num_buffers;
>> -
>>       *nplanes = buffers;
>>         dprintk(dev, 1, "%s: count=%d\n", __func__, *nbuffers);
>
> here the format specifier for "*nbuffers" is "%d"...
>
>> diff --git a/drivers/media/test-drivers/vivid/vivid-vid-out.c 
>> b/drivers/media/test-drivers/vivid/vivid-vid-out.c
>> index 184a6df2c29f..1653b2988f7e 100644
>> --- a/drivers/media/test-drivers/vivid/vivid-vid-out.c
>> +++ b/drivers/media/test-drivers/vivid/vivid-vid-out.c
>> @@ -73,12 +73,9 @@ static int vid_out_queue_setup(struct vb2_queue *vq,
>>                          vfmt->data_offset[p] : size;
>>       }
>>   -    if (vq->num_buffers + *nbuffers < 2)
>> -        *nbuffers = 2 - vq->num_buffers;
>> -
>>       *nplanes = planes;
>>   -    dprintk(dev, 1, "%s: count=%d\n", __func__, *nbuffers);
>> +    dprintk(dev, 1, "%s: count=%u\n", __func__, *nbuffers);
>
> ... but here you change it to "%u". Is there a reason for these two to be
> different? I didn't notice it in the previous version but now it 
> stands out
> clearly. Probably you changed to %u because of the type returned by
> vb2_get_num_buffers(). And, actually, *nbuffers _is_ unsigned, too.

Like you said *nbuffers is unsigned so %u sound for me.
The goal of this patch was to avoid vq->num_buffers usage not to clean up all the
file.
That could be done in other patch since there is lot to do here.

Regards,
Benjamin

>
> Regards,
>
> Andrzej
>
>>       for (p = 0; p < planes; p++)
>>           dprintk(dev, 1, "%s: size[%u]=%u\n", __func__, p, sizes[p]);
>>       return 0;
>

Re: [PATCH v15 30/56] media: test-drivers: Stop direct calls to queue num_buffers field

[Andrzej Pietrasiewicz]

Hi Benjamin,

W dniu 10.11.2023 o 10:55, Benjamin Gaignard pisze:
> 
> Le 10/11/2023 à 10:35, Andrzej Pietrasiewicz a écrit :
>> Hi Benjamin,
>>
>> W dniu 9.11.2023 o 17:34, Benjamin Gaignard pisze:
>>> Use vb2_get_num_buffers() to avoid using queue num_buffers field directly.
>>> This allows us to change how the number of buffers is computed in the
>>> future.
>>> If 'min_buffers_needed' is set remove useless checks in queue setup
>>> functions.
>>>
>>> Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>
>>> CC: Daniel Almeida <daniel.almeida@collabora.com>
>>> ---
>>>   drivers/media/test-drivers/visl/visl-dec.c         | 4 ++--
>>>   drivers/media/test-drivers/vivid/vivid-meta-cap.c  | 3 ---
>>>   drivers/media/test-drivers/vivid/vivid-meta-out.c  | 5 +++--
>>>   drivers/media/test-drivers/vivid/vivid-touch-cap.c | 5 +++--
>>>   drivers/media/test-drivers/vivid/vivid-vbi-cap.c   | 3 ---
>>>   drivers/media/test-drivers/vivid/vivid-vbi-out.c   | 3 ---
>>>   drivers/media/test-drivers/vivid/vivid-vid-cap.c   | 3 ---
>>>   drivers/media/test-drivers/vivid/vivid-vid-out.c   | 5 +----
>>>   8 files changed, 9 insertions(+), 22 deletions(-)
>>>
>>> diff --git a/drivers/media/test-drivers/visl/visl-dec.c 
>>> b/drivers/media/test-drivers/visl/visl-dec.c
>>> index ba20ea998d19..4672dc5e52bb 100644
>>> --- a/drivers/media/test-drivers/visl/visl-dec.c
>>> +++ b/drivers/media/test-drivers/visl/visl-dec.c
>>> @@ -287,7 +287,7 @@ static void visl_tpg_fill(struct visl_ctx *ctx, struct 
>>> visl_run *run)
>>>       frame_dprintk(ctx->dev, run->dst->sequence, "%s\n", buf);
>>>         len = 0;
>>> -    for (i = 0; i < out_q->num_buffers; i++) {
>>> +    for (i = 0; i < vb2_get_num_buffers(out_q); i++) {
>>>           char entry[] = "index: %u, state: %s, request_fd: %d, ";
>>>           u32 old_len = len;
>>>           struct vb2_buffer *vb2;
>>> @@ -347,7 +347,7 @@ static void visl_tpg_fill(struct visl_ctx *ctx, struct 
>>> visl_run *run)
>>>       frame_dprintk(ctx->dev, run->dst->sequence, "%s\n", buf);
>>>         len = 0;
>>> -    for (i = 0; i < cap_q->num_buffers; i++) {
>>> +    for (i = 0; i < vb2_get_num_buffers(cap_q); i++) {
>>>           u32 old_len = len;
>>>           struct vb2_buffer *vb2;
>>>           char *q_status;
>>> diff --git a/drivers/media/test-drivers/vivid/vivid-meta-cap.c 
>>> b/drivers/media/test-drivers/vivid/vivid-meta-cap.c
>>> index 780f96860a6d..0a718d037e59 100644
>>> --- a/drivers/media/test-drivers/vivid/vivid-meta-cap.c
>>> +++ b/drivers/media/test-drivers/vivid/vivid-meta-cap.c
>>> @@ -30,9 +30,6 @@ static int meta_cap_queue_setup(struct vb2_queue *vq, 
>>> unsigned int *nbuffers,
>>>           sizes[0] = size;
>>>       }
>>>   -    if (vq->num_buffers + *nbuffers < 2)
>>> -        *nbuffers = 2 - vq->num_buffers;
>>> -
>>>       *nplanes = 1;
>>>       return 0;
>>>   }
>>> diff --git a/drivers/media/test-drivers/vivid/vivid-meta-out.c 
>>> b/drivers/media/test-drivers/vivid/vivid-meta-out.c
>>> index 95835b52b58f..4a569a6e58be 100644
>>> --- a/drivers/media/test-drivers/vivid/vivid-meta-out.c
>>> +++ b/drivers/media/test-drivers/vivid/vivid-meta-out.c
>>> @@ -18,6 +18,7 @@ static int meta_out_queue_setup(struct vb2_queue *vq, 
>>> unsigned int *nbuffers,
>>>                   struct device *alloc_devs[])
>>>   {
>>>       struct vivid_dev *dev = vb2_get_drv_priv(vq);
>>> +    unsigned int q_num_bufs = vb2_get_num_buffers(vq);
>>>       unsigned int size =  sizeof(struct vivid_meta_out_buf);
>>>         if (!vivid_is_webcam(dev))
>>> @@ -30,8 +31,8 @@ static int meta_out_queue_setup(struct vb2_queue *vq, 
>>> unsigned int *nbuffers,
>>>           sizes[0] = size;
>>>       }
>>>   -    if (vq->num_buffers + *nbuffers < 2)
>>> -        *nbuffers = 2 - vq->num_buffers;
>>> +    if (q_num_bufs + *nbuffers < 2)
>>> +        *nbuffers = 2 - q_num_bufs;
>>>         *nplanes = 1;
>>>       return 0;
>>> diff --git a/drivers/media/test-drivers/vivid/vivid-touch-cap.c 
>>> b/drivers/media/test-drivers/vivid/vivid-touch-cap.c
>>> index c7f6e23df51e..4b3c6ea0afde 100644
>>> --- a/drivers/media/test-drivers/vivid/vivid-touch-cap.c
>>> +++ b/drivers/media/test-drivers/vivid/vivid-touch-cap.c
>>> @@ -13,6 +13,7 @@ static int touch_cap_queue_setup(struct vb2_queue *vq, 
>>> unsigned int *nbuffers,
>>>                    struct device *alloc_devs[])
>>>   {
>>>       struct vivid_dev *dev = vb2_get_drv_priv(vq);
>>> +    unsigned int q_num_bufs = vb2_get_num_buffers(vq);
>>>       struct v4l2_pix_format *f = &dev->tch_format;
>>>       unsigned int size = f->sizeimage;
>>>   @@ -23,8 +24,8 @@ static int touch_cap_queue_setup(struct vb2_queue *vq, 
>>> unsigned int *nbuffers,
>>>           sizes[0] = size;
>>>       }
>>>   -    if (vq->num_buffers + *nbuffers < 2)
>>> -        *nbuffers = 2 - vq->num_buffers;
>>> +    if (q_num_bufs + *nbuffers < 2)
>>> +        *nbuffers = 2 - q_num_bufs;
>>>         *nplanes = 1;
>>>       return 0;
>>> diff --git a/drivers/media/test-drivers/vivid/vivid-vbi-cap.c 
>>> b/drivers/media/test-drivers/vivid/vivid-vbi-cap.c
>>> index b65b02eeeb97..3840b3a664ac 100644
>>> --- a/drivers/media/test-drivers/vivid/vivid-vbi-cap.c
>>> +++ b/drivers/media/test-drivers/vivid/vivid-vbi-cap.c
>>> @@ -134,9 +134,6 @@ static int vbi_cap_queue_setup(struct vb2_queue *vq,
>>>         sizes[0] = size;
>>>   -    if (vq->num_buffers + *nbuffers < 2)
>>> -        *nbuffers = 2 - vq->num_buffers;
>>> -
>>>       *nplanes = 1;
>>>       return 0;
>>>   }
>>> diff --git a/drivers/media/test-drivers/vivid/vivid-vbi-out.c 
>>> b/drivers/media/test-drivers/vivid/vivid-vbi-out.c
>>> index cd56476902a2..434a10676417 100644
>>> --- a/drivers/media/test-drivers/vivid/vivid-vbi-out.c
>>> +++ b/drivers/media/test-drivers/vivid/vivid-vbi-out.c
>>> @@ -30,9 +30,6 @@ static int vbi_out_queue_setup(struct vb2_queue *vq,
>>>         sizes[0] = size;
>>>   -    if (vq->num_buffers + *nbuffers < 2)
>>> -        *nbuffers = 2 - vq->num_buffers;
>>> -
>>>       *nplanes = 1;
>>>       return 0;
>>>   }
>>> diff --git a/drivers/media/test-drivers/vivid/vivid-vid-cap.c 
>>> b/drivers/media/test-drivers/vivid/vivid-vid-cap.c
>>> index 3a06df35a2d7..2804975fe278 100644
>>> --- a/drivers/media/test-drivers/vivid/vivid-vid-cap.c
>>> +++ b/drivers/media/test-drivers/vivid/vivid-vid-cap.c
>>> @@ -117,9 +117,6 @@ static int vid_cap_queue_setup(struct vb2_queue *vq,
>>>                       dev->fmt_cap->data_offset[p];
>>>       }
>>>   -    if (vq->num_buffers + *nbuffers < 2)
>>> -        *nbuffers = 2 - vq->num_buffers;
>>> -
>>>       *nplanes = buffers;
>>>         dprintk(dev, 1, "%s: count=%d\n", __func__, *nbuffers);
>>
>> here the format specifier for "*nbuffers" is "%d"...
>>
>>> diff --git a/drivers/media/test-drivers/vivid/vivid-vid-out.c 
>>> b/drivers/media/test-drivers/vivid/vivid-vid-out.c
>>> index 184a6df2c29f..1653b2988f7e 100644
>>> --- a/drivers/media/test-drivers/vivid/vivid-vid-out.c
>>> +++ b/drivers/media/test-drivers/vivid/vivid-vid-out.c
>>> @@ -73,12 +73,9 @@ static int vid_out_queue_setup(struct vb2_queue *vq,
>>>                          vfmt->data_offset[p] : size;
>>>       }
>>>   -    if (vq->num_buffers + *nbuffers < 2)
>>> -        *nbuffers = 2 - vq->num_buffers;
>>> -
>>>       *nplanes = planes;
>>>   -    dprintk(dev, 1, "%s: count=%d\n", __func__, *nbuffers);
>>> +    dprintk(dev, 1, "%s: count=%u\n", __func__, *nbuffers);
>>
>> ... but here you change it to "%u". Is there a reason for these two to be
>> different? I didn't notice it in the previous version but now it stands out
>> clearly. Probably you changed to %u because of the type returned by
>> vb2_get_num_buffers(). And, actually, *nbuffers _is_ unsigned, too.
> 
> Like you said *nbuffers is unsigned so %u sound for me.
> The goal of this patch was to avoid vq->num_buffers usage not to clean up all the
> file.
> That could be done in other patch since there is lot to do here.
> 

Arguably, if the purpose of this patch is to avoid using vq->num_buffers,
the line we're discussing could be left unpatched, which minimizes the diffstat.

Otherwise, you _are_ changing vid_cap_queue_setup() anyway.

Regards,

Andrzej

> Regards,
> Benjamin
> 
>>
>> Regards,
>>
>> Andrzej
>>
>>>       for (p = 0; p < planes; p++)
>>>           dprintk(dev, 1, "%s: size[%u]=%u\n", __func__, p, sizes[p]);
>>>       return 0;
>>

[PATCH v15 31/56] media: imx: Stop direct calls to queue num_buffers field

[Benjamin Gaignard]

Use vb2_get_num_buffers() to avoid using queue num_buffers field directly.
This allows us to change how the number of buffers is computed in the
future.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>
Reviewed-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com>
CC: Steve Longerbeam <slongerbeam@gmail.com>
CC: Philipp Zabel <p.zabel@pengutronix.de>
---
 drivers/staging/media/imx/imx-media-capture.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/staging/media/imx/imx-media-capture.c b/drivers/staging/media/imx/imx-media-capture.c
index 4846078315ff..ce02199e7b1b 100644
--- a/drivers/staging/media/imx/imx-media-capture.c
+++ b/drivers/staging/media/imx/imx-media-capture.c
@@ -605,6 +605,7 @@ static int capture_queue_setup(struct vb2_queue *vq,
 {
 	struct capture_priv *priv = vb2_get_drv_priv(vq);
 	struct v4l2_pix_format *pix = &priv->vdev.fmt;
+	unsigned int q_num_bufs = vb2_get_num_buffers(vq);
 	unsigned int count = *nbuffers;
 
 	if (vq->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
@@ -613,14 +614,14 @@ static int capture_queue_setup(struct vb2_queue *vq,
 	if (*nplanes) {
 		if (*nplanes != 1 || sizes[0] < pix->sizeimage)
 			return -EINVAL;
-		count += vq->num_buffers;
+		count += q_num_bufs;
 	}
 
 	count = min_t(__u32, VID_MEM_LIMIT / pix->sizeimage, count);
 
 	if (*nplanes)
-		*nbuffers = (count < vq->num_buffers) ? 0 :
-			count - vq->num_buffers;
+		*nbuffers = (count < q_num_bufs) ? 0 :
+			count - q_num_bufs;
 	else
 		*nbuffers = count;
 
-- 
2.39.2

[PATCH v15 32/56] media: meson: vdec: Stop direct calls to queue num_buffers field

[Benjamin Gaignard]

Use vb2_get_num_buffers() to avoid using queue num_buffers field directly.
This allows us to change how the number of buffers is computed in the
future.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>
Reviewed-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com>
CC: Neil Armstrong <neil.armstrong@linaro.org>
---
 drivers/staging/media/meson/vdec/vdec.c | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/drivers/staging/media/meson/vdec/vdec.c b/drivers/staging/media/meson/vdec/vdec.c
index 219185aaa588..1e2369f104c8 100644
--- a/drivers/staging/media/meson/vdec/vdec.c
+++ b/drivers/staging/media/meson/vdec/vdec.c
@@ -167,22 +167,23 @@ static void process_num_buffers(struct vb2_queue *q,
 				bool is_reqbufs)
 {
 	const struct amvdec_format *fmt_out = sess->fmt_out;
-	unsigned int buffers_total = q->num_buffers + *num_buffers;
+	unsigned int q_num_bufs = vb2_get_num_buffers(q);
+	unsigned int buffers_total = q_num_bufs + *num_buffers;
 	u32 min_buf_capture = v4l2_ctrl_g_ctrl(sess->ctrl_min_buf_capture);
 
-	if (q->num_buffers + *num_buffers < min_buf_capture)
-		*num_buffers = min_buf_capture - q->num_buffers;
+	if (q_num_bufs + *num_buffers < min_buf_capture)
+		*num_buffers = min_buf_capture - q_num_bufs;
 	if (is_reqbufs && buffers_total < fmt_out->min_buffers)
-		*num_buffers = fmt_out->min_buffers - q->num_buffers;
+		*num_buffers = fmt_out->min_buffers - q_num_bufs;
 	if (buffers_total > fmt_out->max_buffers)
-		*num_buffers = fmt_out->max_buffers - q->num_buffers;
+		*num_buffers = fmt_out->max_buffers - q_num_bufs;
 
 	/* We need to program the complete CAPTURE buffer list
 	 * in registers during start_streaming, and the firmwares
 	 * are free to choose any of them to write frames to. As such,
 	 * we need all of them to be queued into the driver
 	 */
-	sess->num_dst_bufs = q->num_buffers + *num_buffers;
+	sess->num_dst_bufs = q_num_bufs + *num_buffers;
 	q->min_buffers_needed = max(fmt_out->min_buffers, sess->num_dst_bufs);
 }
 
-- 
2.39.2

[PATCH v15 33/56] touchscreen: sur40: Stop direct calls to queue num_buffers field

[Benjamin Gaignard]

Use vb2_get_num_buffers() to avoid using queue num_buffers field directly.
This allows us to change how the number of buffers is computed in the
future.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>
Reviewed-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com>
Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
---
 drivers/input/touchscreen/sur40.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/input/touchscreen/sur40.c b/drivers/input/touchscreen/sur40.c
index 8ddb3f7d307a..e7d2a52169a0 100644
--- a/drivers/input/touchscreen/sur40.c
+++ b/drivers/input/touchscreen/sur40.c
@@ -847,9 +847,10 @@ static int sur40_queue_setup(struct vb2_queue *q,
 		       unsigned int sizes[], struct device *alloc_devs[])
 {
 	struct sur40_state *sur40 = vb2_get_drv_priv(q);
+	unsigned int q_num_bufs = vb2_get_num_buffers(q);
 
-	if (q->num_buffers + *nbuffers < 3)
-		*nbuffers = 3 - q->num_buffers;
+	if (q_num_bufs + *nbuffers < 3)
+		*nbuffers = 3 - q_num_bufs;
 
 	if (*nplanes)
 		return sizes[0] < sur40->pix_fmt.sizeimage ? -EINVAL : 0;
-- 
2.39.2

[PATCH v15 34/56] sample: v4l: Stop direct calls to queue num_buffers field

[Benjamin Gaignard]

Use vb2_get_num_buffers() to avoid using queue num_buffers field directly.
This allows us to change how the number of buffers is computed in the
future.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>
Reviewed-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com>
---
 samples/v4l/v4l2-pci-skeleton.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/samples/v4l/v4l2-pci-skeleton.c b/samples/v4l/v4l2-pci-skeleton.c
index a61f94db18d9..a65aa9d1e9da 100644
--- a/samples/v4l/v4l2-pci-skeleton.c
+++ b/samples/v4l/v4l2-pci-skeleton.c
@@ -155,6 +155,7 @@ static int queue_setup(struct vb2_queue *vq,
 		       unsigned int sizes[], struct device *alloc_devs[])
 {
 	struct skeleton *skel = vb2_get_drv_priv(vq);
+	unsigned int q_num_bufs = vb2_get_num_buffers(vq);
 
 	skel->field = skel->format.field;
 	if (skel->field == V4L2_FIELD_ALTERNATE) {
@@ -167,8 +168,8 @@ static int queue_setup(struct vb2_queue *vq,
 		skel->field = V4L2_FIELD_TOP;
 	}
 
-	if (vq->num_buffers + *nbuffers < 3)
-		*nbuffers = 3 - vq->num_buffers;
+	if (q_num_bufs + *nbuffers < 3)
+		*nbuffers = 3 - q_num_bufs;
 
 	if (*nplanes)
 		return sizes[0] < skel->format.sizeimage ? -EINVAL : 0;
-- 
2.39.2

[PATCH v15 35/56] media: cedrus: Stop direct calls to queue num_buffers field

[Benjamin Gaignard]

Use vb2_get_num_buffers() to avoid using queue num_buffers field directly.
This allows us to change how the number of buffers is computed in the
future.
While at it, check the return value of vb2_get_buffer().

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>
Reviewed-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com>
Acked-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
CC: Maxime Ripard <mripard@kernel.org>
---
 drivers/staging/media/sunxi/cedrus/cedrus_h264.c | 9 +++++++--
 drivers/staging/media/sunxi/cedrus/cedrus_h265.c | 9 +++++++--
 2 files changed, 14 insertions(+), 4 deletions(-)

diff --git a/drivers/staging/media/sunxi/cedrus/cedrus_h264.c b/drivers/staging/media/sunxi/cedrus/cedrus_h264.c
index dfb401df138a..3e2843ef6cce 100644
--- a/drivers/staging/media/sunxi/cedrus/cedrus_h264.c
+++ b/drivers/staging/media/sunxi/cedrus/cedrus_h264.c
@@ -653,8 +653,13 @@ static void cedrus_h264_stop(struct cedrus_ctx *ctx)
 
 	vq = v4l2_m2m_get_vq(ctx->fh.m2m_ctx, V4L2_BUF_TYPE_VIDEO_CAPTURE);
 
-	for (i = 0; i < vq->num_buffers; i++) {
-		buf = vb2_to_cedrus_buffer(vb2_get_buffer(vq, i));
+	for (i = 0; i < vb2_get_num_buffers(vq); i++) {
+		struct vb2_buffer *vb = vb2_get_buffer(vq, i);
+
+		if (!vb)
+			continue;
+
+		buf = vb2_to_cedrus_buffer(vb);
 
 		if (buf->codec.h264.mv_col_buf_size > 0) {
 			dma_free_attrs(dev->dev,
diff --git a/drivers/staging/media/sunxi/cedrus/cedrus_h265.c b/drivers/staging/media/sunxi/cedrus/cedrus_h265.c
index fc9297232456..52e94c8f2f01 100644
--- a/drivers/staging/media/sunxi/cedrus/cedrus_h265.c
+++ b/drivers/staging/media/sunxi/cedrus/cedrus_h265.c
@@ -869,8 +869,13 @@ static void cedrus_h265_stop(struct cedrus_ctx *ctx)
 
 	vq = v4l2_m2m_get_vq(ctx->fh.m2m_ctx, V4L2_BUF_TYPE_VIDEO_CAPTURE);
 
-	for (i = 0; i < vq->num_buffers; i++) {
-		buf = vb2_to_cedrus_buffer(vb2_get_buffer(vq, i));
+	for (i = 0; i < vb2_get_num_buffers(vq); i++) {
+		struct vb2_buffer *vb = vb2_get_buffer(vq, i);
+
+		if (!vb)
+			continue;
+
+		buf = vb2_to_cedrus_buffer(vb);
 
 		if (buf->codec.h265.mv_col_buf_size > 0) {
 			dma_free_attrs(dev->dev,
-- 
2.39.2

[PATCH v15 36/56] media: nuvoton: Stop direct calls to queue num_buffers field

[Benjamin Gaignard]

Use vb2_get_num_buffers() to avoid using queue num_buffers field directly.
This allows us to change how the number of buffers is computed in the
future.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>
Reviewed-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com>
CC: Joseph Liu <kwliu@nuvoton.com>
CC: Marvin Lin <kflin@nuvoton.com>
---
 drivers/media/platform/nuvoton/npcm-video.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/media/platform/nuvoton/npcm-video.c b/drivers/media/platform/nuvoton/npcm-video.c
index b9e6782f59b4..f9b4e36a5175 100644
--- a/drivers/media/platform/nuvoton/npcm-video.c
+++ b/drivers/media/platform/nuvoton/npcm-video.c
@@ -393,7 +393,7 @@ static void npcm_video_free_diff_table(struct npcm_video *video)
 	struct rect_list *tmp;
 	unsigned int i;
 
-	for (i = 0; i < video->queue.num_buffers; i++) {
+	for (i = 0; i < vb2_get_num_buffers(&video->queue); i++) {
 		head = &video->list[i];
 		list_for_each_safe(pos, nx, head) {
 			tmp = list_entry(pos, struct rect_list, list);
-- 
2.39.2

[PATCH v15 37/56] media: renesas: Stop direct calls to queue num_buffers field

[Benjamin Gaignard]

Use vb2_get_num_buffers() to avoid using queue num_buffers field directly.
This allows us to change how the number of buffers is computed in the
future.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>
Reviewed-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com>
CC: Fabrizio Castro <fabrizio.castro.jz@renesas.com>
---
 drivers/media/platform/renesas/rcar_drif.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/media/platform/renesas/rcar_drif.c b/drivers/media/platform/renesas/rcar_drif.c
index 292c5bf9e50c..f21d05054341 100644
--- a/drivers/media/platform/renesas/rcar_drif.c
+++ b/drivers/media/platform/renesas/rcar_drif.c
@@ -424,10 +424,11 @@ static int rcar_drif_queue_setup(struct vb2_queue *vq,
 			unsigned int sizes[], struct device *alloc_devs[])
 {
 	struct rcar_drif_sdr *sdr = vb2_get_drv_priv(vq);
+	unsigned int q_num_bufs = vb2_get_num_buffers(vq);
 
 	/* Need at least 16 buffers */
-	if (vq->num_buffers + *num_buffers < 16)
-		*num_buffers = 16 - vq->num_buffers;
+	if (q_num_bufs + *num_buffers < 16)
+		*num_buffers = 16 - q_num_bufs;
 
 	*num_planes = 1;
 	sizes[0] = PAGE_ALIGN(sdr->fmt->buffersize);
-- 
2.39.2

[PATCH v15 38/56] media: ti: Stop direct calls to queue num_buffers field

[Benjamin Gaignard]

Use vb2_get_num_buffers() to avoid using queue num_buffers field directly.
This allows us to change how the number of buffers is computed in the
future.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>
Reviewed-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com>
CC: "Lad, Prabhakar" <prabhakar.csengg@gmail.com>
---
 drivers/media/platform/ti/am437x/am437x-vpfe.c   | 5 +++--
 drivers/media/platform/ti/cal/cal-video.c        | 5 +++--
 drivers/media/platform/ti/davinci/vpif_capture.c | 5 +++--
 drivers/media/platform/ti/davinci/vpif_display.c | 5 +++--
 drivers/media/platform/ti/omap/omap_vout.c       | 5 +++--
 5 files changed, 15 insertions(+), 10 deletions(-)

diff --git a/drivers/media/platform/ti/am437x/am437x-vpfe.c b/drivers/media/platform/ti/am437x/am437x-vpfe.c
index 5fa2ea9025d9..f18acf9286a2 100644
--- a/drivers/media/platform/ti/am437x/am437x-vpfe.c
+++ b/drivers/media/platform/ti/am437x/am437x-vpfe.c
@@ -1771,9 +1771,10 @@ static int vpfe_queue_setup(struct vb2_queue *vq,
 {
 	struct vpfe_device *vpfe = vb2_get_drv_priv(vq);
 	unsigned size = vpfe->fmt.fmt.pix.sizeimage;
+	unsigned int q_num_bufs = vb2_get_num_buffers(vq);
 
-	if (vq->num_buffers + *nbuffers < 3)
-		*nbuffers = 3 - vq->num_buffers;
+	if (q_num_bufs + *nbuffers < 3)
+		*nbuffers = 3 - q_num_bufs;
 
 	if (*nplanes) {
 		if (sizes[0] < size)
diff --git a/drivers/media/platform/ti/cal/cal-video.c b/drivers/media/platform/ti/cal/cal-video.c
index a8abcd0fee17..94e67c057a20 100644
--- a/drivers/media/platform/ti/cal/cal-video.c
+++ b/drivers/media/platform/ti/cal/cal-video.c
@@ -603,9 +603,10 @@ static int cal_queue_setup(struct vb2_queue *vq,
 {
 	struct cal_ctx *ctx = vb2_get_drv_priv(vq);
 	unsigned int size = ctx->v_fmt.fmt.pix.sizeimage;
+	unsigned int q_num_bufs = vb2_get_num_buffers(vq);
 
-	if (vq->num_buffers + *nbuffers < 3)
-		*nbuffers = 3 - vq->num_buffers;
+	if (q_num_bufs + *nbuffers < 3)
+		*nbuffers = 3 - q_num_bufs;
 
 	if (*nplanes) {
 		if (sizes[0] < size)
diff --git a/drivers/media/platform/ti/davinci/vpif_capture.c b/drivers/media/platform/ti/davinci/vpif_capture.c
index 99fae8830c41..fc42b4bc37e6 100644
--- a/drivers/media/platform/ti/davinci/vpif_capture.c
+++ b/drivers/media/platform/ti/davinci/vpif_capture.c
@@ -113,6 +113,7 @@ static int vpif_buffer_queue_setup(struct vb2_queue *vq,
 	struct channel_obj *ch = vb2_get_drv_priv(vq);
 	struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX];
 	unsigned size = common->fmt.fmt.pix.sizeimage;
+	unsigned int q_num_bufs = vb2_get_num_buffers(vq);
 
 	vpif_dbg(2, debug, "vpif_buffer_setup\n");
 
@@ -122,8 +123,8 @@ static int vpif_buffer_queue_setup(struct vb2_queue *vq,
 		size = sizes[0];
 	}
 
-	if (vq->num_buffers + *nbuffers < 3)
-		*nbuffers = 3 - vq->num_buffers;
+	if (q_num_bufs + *nbuffers < 3)
+		*nbuffers = 3 - q_num_bufs;
 
 	*nplanes = 1;
 	sizes[0] = size;
diff --git a/drivers/media/platform/ti/davinci/vpif_display.c b/drivers/media/platform/ti/davinci/vpif_display.c
index f8ec2991c667..9dbab1003c1d 100644
--- a/drivers/media/platform/ti/davinci/vpif_display.c
+++ b/drivers/media/platform/ti/davinci/vpif_display.c
@@ -115,6 +115,7 @@ static int vpif_buffer_queue_setup(struct vb2_queue *vq,
 	struct channel_obj *ch = vb2_get_drv_priv(vq);
 	struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX];
 	unsigned size = common->fmt.fmt.pix.sizeimage;
+	unsigned int q_num_bufs = vb2_get_num_buffers(vq);
 
 	if (*nplanes) {
 		if (sizes[0] < size)
@@ -122,8 +123,8 @@ static int vpif_buffer_queue_setup(struct vb2_queue *vq,
 		size = sizes[0];
 	}
 
-	if (vq->num_buffers + *nbuffers < 3)
-		*nbuffers = 3 - vq->num_buffers;
+	if (q_num_bufs + *nbuffers < 3)
+		*nbuffers = 3 - q_num_bufs;
 
 	*nplanes = 1;
 	sizes[0] = size;
diff --git a/drivers/media/platform/ti/omap/omap_vout.c b/drivers/media/platform/ti/omap/omap_vout.c
index 4143274089c3..72ce903717d3 100644
--- a/drivers/media/platform/ti/omap/omap_vout.c
+++ b/drivers/media/platform/ti/omap/omap_vout.c
@@ -944,10 +944,11 @@ static int omap_vout_vb2_queue_setup(struct vb2_queue *vq,
 				     struct device *alloc_devs[])
 {
 	struct omap_vout_device *vout = vb2_get_drv_priv(vq);
+	unsigned int q_num_bufs = vb2_get_num_buffers(vq);
 	int size = vout->pix.sizeimage;
 
-	if (is_rotation_enabled(vout) && vq->num_buffers + *nbufs > VRFB_NUM_BUFS) {
-		*nbufs = VRFB_NUM_BUFS - vq->num_buffers;
+	if (is_rotation_enabled(vout) && q_num_bufs + *nbufs > VRFB_NUM_BUFS) {
+		*nbufs = VRFB_NUM_BUFS - q_num_bufs;
 		if (*nbufs == 0)
 			return -EINVAL;
 	}
-- 
2.39.2

Re: [PATCH v15 38/56] media: ti: Stop direct calls to queue num_buffers field

[Lad, Prabhakar]

On Thu, Nov 9, 2023 at 4:38 PM Benjamin Gaignard
<benjamin.gaignard@collabora.com> wrote:
>
> Use vb2_get_num_buffers() to avoid using queue num_buffers field directly.
> This allows us to change how the number of buffers is computed in the
> future.
>
> Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>
> Reviewed-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com>
> CC: "Lad, Prabhakar" <prabhakar.csengg@gmail.com>
> ---
>  drivers/media/platform/ti/am437x/am437x-vpfe.c   | 5 +++--
>  drivers/media/platform/ti/cal/cal-video.c        | 5 +++--
>  drivers/media/platform/ti/davinci/vpif_capture.c | 5 +++--
>  drivers/media/platform/ti/davinci/vpif_display.c | 5 +++--
>  drivers/media/platform/ti/omap/omap_vout.c       | 5 +++--
>  5 files changed, 15 insertions(+), 10 deletions(-)
>
Reviewed-by: Prabhakar <prabhakar.csengg@gmail.com>

Cheers,
Prabhakar

> diff --git a/drivers/media/platform/ti/am437x/am437x-vpfe.c b/drivers/media/platform/ti/am437x/am437x-vpfe.c
> index 5fa2ea9025d9..f18acf9286a2 100644
> --- a/drivers/media/platform/ti/am437x/am437x-vpfe.c
> +++ b/drivers/media/platform/ti/am437x/am437x-vpfe.c
> @@ -1771,9 +1771,10 @@ static int vpfe_queue_setup(struct vb2_queue *vq,
>  {
>         struct vpfe_device *vpfe = vb2_get_drv_priv(vq);
>         unsigned size = vpfe->fmt.fmt.pix.sizeimage;
> +       unsigned int q_num_bufs = vb2_get_num_buffers(vq);
>
> -       if (vq->num_buffers + *nbuffers < 3)
> -               *nbuffers = 3 - vq->num_buffers;
> +       if (q_num_bufs + *nbuffers < 3)
> +               *nbuffers = 3 - q_num_bufs;
>
>         if (*nplanes) {
>                 if (sizes[0] < size)
> diff --git a/drivers/media/platform/ti/cal/cal-video.c b/drivers/media/platform/ti/cal/cal-video.c
> index a8abcd0fee17..94e67c057a20 100644
> --- a/drivers/media/platform/ti/cal/cal-video.c
> +++ b/drivers/media/platform/ti/cal/cal-video.c
> @@ -603,9 +603,10 @@ static int cal_queue_setup(struct vb2_queue *vq,
>  {
>         struct cal_ctx *ctx = vb2_get_drv_priv(vq);
>         unsigned int size = ctx->v_fmt.fmt.pix.sizeimage;
> +       unsigned int q_num_bufs = vb2_get_num_buffers(vq);
>
> -       if (vq->num_buffers + *nbuffers < 3)
> -               *nbuffers = 3 - vq->num_buffers;
> +       if (q_num_bufs + *nbuffers < 3)
> +               *nbuffers = 3 - q_num_bufs;
>
>         if (*nplanes) {
>                 if (sizes[0] < size)
> diff --git a/drivers/media/platform/ti/davinci/vpif_capture.c b/drivers/media/platform/ti/davinci/vpif_capture.c
> index 99fae8830c41..fc42b4bc37e6 100644
> --- a/drivers/media/platform/ti/davinci/vpif_capture.c
> +++ b/drivers/media/platform/ti/davinci/vpif_capture.c
> @@ -113,6 +113,7 @@ static int vpif_buffer_queue_setup(struct vb2_queue *vq,
>         struct channel_obj *ch = vb2_get_drv_priv(vq);
>         struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX];
>         unsigned size = common->fmt.fmt.pix.sizeimage;
> +       unsigned int q_num_bufs = vb2_get_num_buffers(vq);
>
>         vpif_dbg(2, debug, "vpif_buffer_setup\n");
>
> @@ -122,8 +123,8 @@ static int vpif_buffer_queue_setup(struct vb2_queue *vq,
>                 size = sizes[0];
>         }
>
> -       if (vq->num_buffers + *nbuffers < 3)
> -               *nbuffers = 3 - vq->num_buffers;
> +       if (q_num_bufs + *nbuffers < 3)
> +               *nbuffers = 3 - q_num_bufs;
>
>         *nplanes = 1;
>         sizes[0] = size;
> diff --git a/drivers/media/platform/ti/davinci/vpif_display.c b/drivers/media/platform/ti/davinci/vpif_display.c
> index f8ec2991c667..9dbab1003c1d 100644
> --- a/drivers/media/platform/ti/davinci/vpif_display.c
> +++ b/drivers/media/platform/ti/davinci/vpif_display.c
> @@ -115,6 +115,7 @@ static int vpif_buffer_queue_setup(struct vb2_queue *vq,
>         struct channel_obj *ch = vb2_get_drv_priv(vq);
>         struct common_obj *common = &ch->common[VPIF_VIDEO_INDEX];
>         unsigned size = common->fmt.fmt.pix.sizeimage;
> +       unsigned int q_num_bufs = vb2_get_num_buffers(vq);
>
>         if (*nplanes) {
>                 if (sizes[0] < size)
> @@ -122,8 +123,8 @@ static int vpif_buffer_queue_setup(struct vb2_queue *vq,
>                 size = sizes[0];
>         }
>
> -       if (vq->num_buffers + *nbuffers < 3)
> -               *nbuffers = 3 - vq->num_buffers;
> +       if (q_num_bufs + *nbuffers < 3)
> +               *nbuffers = 3 - q_num_bufs;
>
>         *nplanes = 1;
>         sizes[0] = size;
> diff --git a/drivers/media/platform/ti/omap/omap_vout.c b/drivers/media/platform/ti/omap/omap_vout.c
> index 4143274089c3..72ce903717d3 100644
> --- a/drivers/media/platform/ti/omap/omap_vout.c
> +++ b/drivers/media/platform/ti/omap/omap_vout.c
> @@ -944,10 +944,11 @@ static int omap_vout_vb2_queue_setup(struct vb2_queue *vq,
>                                      struct device *alloc_devs[])
>  {
>         struct omap_vout_device *vout = vb2_get_drv_priv(vq);
> +       unsigned int q_num_bufs = vb2_get_num_buffers(vq);
>         int size = vout->pix.sizeimage;
>
> -       if (is_rotation_enabled(vout) && vq->num_buffers + *nbufs > VRFB_NUM_BUFS) {
> -               *nbufs = VRFB_NUM_BUFS - vq->num_buffers;
> +       if (is_rotation_enabled(vout) && q_num_bufs + *nbufs > VRFB_NUM_BUFS) {
> +               *nbufs = VRFB_NUM_BUFS - q_num_bufs;
>                 if (*nbufs == 0)
>                         return -EINVAL;
>         }
> --
> 2.39.2
>

[PATCH v15 39/56] media: usb: airspy: Stop direct calls to queue num_buffers field

[Benjamin Gaignard]

Use vb2_get_num_buffers() to avoid using queue num_buffers field directly.
This allows us to change how the number of buffers is computed in the
future.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>
Reviewed-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com>
---
 drivers/media/usb/airspy/airspy.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/media/usb/airspy/airspy.c b/drivers/media/usb/airspy/airspy.c
index 462eb8423506..e24e655fb1db 100644
--- a/drivers/media/usb/airspy/airspy.c
+++ b/drivers/media/usb/airspy/airspy.c
@@ -482,12 +482,13 @@ static int airspy_queue_setup(struct vb2_queue *vq,
 		unsigned int *nplanes, unsigned int sizes[], struct device *alloc_devs[])
 {
 	struct airspy *s = vb2_get_drv_priv(vq);
+	unsigned int q_num_bufs = vb2_get_num_buffers(vq);
 
 	dev_dbg(s->dev, "nbuffers=%d\n", *nbuffers);
 
 	/* Need at least 8 buffers */
-	if (vq->num_buffers + *nbuffers < 8)
-		*nbuffers = 8 - vq->num_buffers;
+	if (q_num_bufs + *nbuffers < 8)
+		*nbuffers = 8 - q_num_bufs;
 	*nplanes = 1;
 	sizes[0] = PAGE_ALIGN(s->buffersize);
 
-- 
2.39.2

[PATCH v15 40/56] media: usb: cx231xx: Stop direct calls to queue num_buffers field

[Benjamin Gaignard]

Use vb2_get_num_buffers() to avoid using queue num_buffers field directly.
This allows us to change how the number of buffers is computed in the
future.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>
Reviewed-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com>
---
 drivers/media/usb/cx231xx/cx231xx-417.c   | 5 +++--
 drivers/media/usb/cx231xx/cx231xx-video.c | 5 +++--
 2 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/media/usb/cx231xx/cx231xx-417.c b/drivers/media/usb/cx231xx/cx231xx-417.c
index fe4410a5e128..45973fe690b2 100644
--- a/drivers/media/usb/cx231xx/cx231xx-417.c
+++ b/drivers/media/usb/cx231xx/cx231xx-417.c
@@ -1218,12 +1218,13 @@ static int queue_setup(struct vb2_queue *vq,
 {
 	struct cx231xx *dev = vb2_get_drv_priv(vq);
 	unsigned int size = mpeglinesize * mpeglines;
+	unsigned int q_num_bufs = vb2_get_num_buffers(vq);
 
 	dev->ts1.ts_packet_size  = mpeglinesize;
 	dev->ts1.ts_packet_count = mpeglines;
 
-	if (vq->num_buffers + *nbuffers < CX231XX_MIN_BUF)
-		*nbuffers = CX231XX_MIN_BUF - vq->num_buffers;
+	if (q_num_bufs + *nbuffers < CX231XX_MIN_BUF)
+		*nbuffers = CX231XX_MIN_BUF - q_num_bufs;
 
 	if (*nplanes)
 		return sizes[0] < size ? -EINVAL : 0;
diff --git a/drivers/media/usb/cx231xx/cx231xx-video.c b/drivers/media/usb/cx231xx/cx231xx-video.c
index e23b8ccd79d4..c8eb4222319d 100644
--- a/drivers/media/usb/cx231xx/cx231xx-video.c
+++ b/drivers/media/usb/cx231xx/cx231xx-video.c
@@ -714,11 +714,12 @@ static int queue_setup(struct vb2_queue *vq,
 		       unsigned int sizes[], struct device *alloc_devs[])
 {
 	struct cx231xx *dev = vb2_get_drv_priv(vq);
+	unsigned int q_num_bufs = vb2_get_num_buffers(vq);
 
 	dev->size = (dev->width * dev->height * dev->format->depth + 7) >> 3;
 
-	if (vq->num_buffers + *nbuffers < CX231XX_MIN_BUF)
-		*nbuffers = CX231XX_MIN_BUF - vq->num_buffers;
+	if (q_num_bufs + *nbuffers < CX231XX_MIN_BUF)
+		*nbuffers = CX231XX_MIN_BUF - q_num_bufs;
 
 	if (*nplanes)
 		return sizes[0] < dev->size ? -EINVAL : 0;
-- 
2.39.2

[PATCH v15 41/56] media: usb: hackrf: Stop direct calls to queue num_buffers field

[Benjamin Gaignard]

Use vb2_get_num_buffers() to avoid using queue num_buffers field directly.
This allows us to change how the number of buffers is computed in the
future.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>
Reviewed-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com>
CC: Antti Palosaari <crope@iki.fi>
---
 drivers/media/usb/hackrf/hackrf.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/media/usb/hackrf/hackrf.c b/drivers/media/usb/hackrf/hackrf.c
index 3e535be2c520..9c0ecd5f056c 100644
--- a/drivers/media/usb/hackrf/hackrf.c
+++ b/drivers/media/usb/hackrf/hackrf.c
@@ -753,12 +753,13 @@ static int hackrf_queue_setup(struct vb2_queue *vq,
 		unsigned int *nplanes, unsigned int sizes[], struct device *alloc_devs[])
 {
 	struct hackrf_dev *dev = vb2_get_drv_priv(vq);
+	unsigned int q_num_bufs = vb2_get_num_buffers(vq);
 
 	dev_dbg(dev->dev, "nbuffers=%d\n", *nbuffers);
 
 	/* Need at least 8 buffers */
-	if (vq->num_buffers + *nbuffers < 8)
-		*nbuffers = 8 - vq->num_buffers;
+	if (q_num_bufs + *nbuffers < 8)
+		*nbuffers = 8 - q_num_bufs;
 	*nplanes = 1;
 	sizes[0] = PAGE_ALIGN(dev->buffersize);
 
-- 
2.39.2

[PATCH v15 42/56] media: usb: usbtv: Stop direct calls to queue num_buffers field

[Benjamin Gaignard]

Use vb2_get_num_buffers() to avoid using queue num_buffers field directly.
This allows us to change how the number of buffers is computed in the
future.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>
Reviewed-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com>
---
 drivers/media/usb/usbtv/usbtv-video.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/media/usb/usbtv/usbtv-video.c b/drivers/media/usb/usbtv/usbtv-video.c
index 1e30e05953dc..62a583040cd4 100644
--- a/drivers/media/usb/usbtv/usbtv-video.c
+++ b/drivers/media/usb/usbtv/usbtv-video.c
@@ -726,9 +726,10 @@ static int usbtv_queue_setup(struct vb2_queue *vq,
 {
 	struct usbtv *usbtv = vb2_get_drv_priv(vq);
 	unsigned size = USBTV_CHUNK * usbtv->n_chunks * 2 * sizeof(u32);
+	unsigned int q_num_bufs = vb2_get_num_buffers(vq);
 
-	if (vq->num_buffers + *nbuffers < 2)
-		*nbuffers = 2 - vq->num_buffers;
+	if (q_num_bufs + *nbuffers < 2)
+		*nbuffers = 2 - q_num_bufs;
 	if (*nplanes)
 		return sizes[0] < size ? -EINVAL : 0;
 	*nplanes = 1;
-- 
2.39.2

[PATCH v15 43/56] media videobuf2: Be more flexible on the number of queue stored buffers

[Benjamin Gaignard]

Add 'max_num_buffers' field in vb2_queue struct to let drivers decide
how many buffers could be stored in a queue.
This require 'bufs' array to be allocated at queue init time and freed
when releasing the queue.
By default VB2_MAX_FRAME remains the limit.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
---
 .../media/common/videobuf2/videobuf2-core.c   | 46 +++++++++++++++----
 .../media/common/videobuf2/videobuf2-v4l2.c   |  6 +--
 include/media/videobuf2-core.h                | 12 ++++-
 3 files changed, 52 insertions(+), 12 deletions(-)

diff --git a/drivers/media/common/videobuf2/videobuf2-core.c b/drivers/media/common/videobuf2/videobuf2-core.c
index ce5b84b9bcd4..8c1df829745b 100644
--- a/drivers/media/common/videobuf2/videobuf2-core.c
+++ b/drivers/media/common/videobuf2/videobuf2-core.c
@@ -421,7 +421,7 @@ static void init_buffer_cache_hints(struct vb2_queue *q, struct vb2_buffer *vb)
  */
 static void vb2_queue_add_buffer(struct vb2_queue *q, struct vb2_buffer *vb, unsigned int index)
 {
-	WARN_ON(index >= VB2_MAX_FRAME || q->bufs[index] || vb->vb2_queue);
+	WARN_ON(index >= q->max_num_buffers || q->bufs[index] || vb->vb2_queue);
 
 	q->bufs[index] = vb;
 	vb->index = index;
@@ -454,9 +454,12 @@ static int __vb2_queue_alloc(struct vb2_queue *q, enum vb2_memory memory,
 	struct vb2_buffer *vb;
 	int ret;
 
-	/* Ensure that q->num_buffers+num_buffers is below VB2_MAX_FRAME */
+	/*
+	 * Ensure that the number of already queue + the number of buffers already
+	 * in the queue is below q->max_num_buffers
+	 */
 	num_buffers = min_t(unsigned int, num_buffers,
-			    VB2_MAX_FRAME - q_num_buffers);
+			    q->max_num_buffers - q_num_buffers);
 
 	for (buffer = 0; buffer < num_buffers; ++buffer) {
 		/* Allocate vb2 buffer structures */
@@ -818,7 +821,7 @@ int vb2_core_reqbufs(struct vb2_queue *q, enum vb2_memory memory,
 	unsigned plane_sizes[VB2_MAX_PLANES] = { };
 	bool non_coherent_mem = flags & V4L2_MEMORY_FLAG_NON_COHERENT;
 	unsigned int i;
-	int ret;
+	int ret = 0;
 
 	if (q->streaming) {
 		dprintk(q, 1, "streaming active\n");
@@ -862,17 +865,22 @@ int vb2_core_reqbufs(struct vb2_queue *q, enum vb2_memory memory,
 	/*
 	 * Make sure the requested values and current defaults are sane.
 	 */
-	WARN_ON(q->min_buffers_needed > VB2_MAX_FRAME);
 	num_buffers = max_t(unsigned int, *count, q->min_buffers_needed);
-	num_buffers = min_t(unsigned int, num_buffers, VB2_MAX_FRAME);
+	num_buffers = min_t(unsigned int, num_buffers, q->max_num_buffers);
 	memset(q->alloc_devs, 0, sizeof(q->alloc_devs));
 	/*
 	 * Set this now to ensure that drivers see the correct q->memory value
 	 * in the queue_setup op.
 	 */
 	mutex_lock(&q->mmap_lock);
+	if (!q->bufs)
+		q->bufs = kcalloc(q->max_num_buffers, sizeof(*q->bufs), GFP_KERNEL);
+	if (!q->bufs)
+		ret = -ENOMEM;
 	q->memory = memory;
 	mutex_unlock(&q->mmap_lock);
+	if (ret)
+		return ret;
 	set_queue_coherency(q, non_coherent_mem);
 
 	/*
@@ -981,7 +989,7 @@ int vb2_core_create_bufs(struct vb2_queue *q, enum vb2_memory memory,
 	bool no_previous_buffers = !q_num_bufs;
 	int ret = 0;
 
-	if (q_num_bufs == VB2_MAX_FRAME) {
+	if (q->num_buffers == q->max_num_buffers) {
 		dprintk(q, 1, "maximum number of buffers already allocated\n");
 		return -ENOBUFS;
 	}
@@ -998,7 +1006,13 @@ int vb2_core_create_bufs(struct vb2_queue *q, enum vb2_memory memory,
 		 */
 		mutex_lock(&q->mmap_lock);
 		q->memory = memory;
+		if (!q->bufs)
+			q->bufs = kcalloc(q->max_num_buffers, sizeof(*q->bufs), GFP_KERNEL);
+		if (!q->bufs)
+			ret = -ENOMEM;
 		mutex_unlock(&q->mmap_lock);
+		if (ret)
+			return ret;
 		q->waiting_for_buffers = !q->is_output;
 		set_queue_coherency(q, non_coherent_mem);
 	} else {
@@ -1010,7 +1024,7 @@ int vb2_core_create_bufs(struct vb2_queue *q, enum vb2_memory memory,
 			return -EINVAL;
 	}
 
-	num_buffers = min(*count, VB2_MAX_FRAME - q_num_bufs);
+	num_buffers = min(*count, q->max_num_buffers - q_num_bufs);
 
 	if (requested_planes && requested_sizes) {
 		num_planes = requested_planes;
@@ -2470,6 +2484,16 @@ int vb2_core_queue_init(struct vb2_queue *q)
 	/*
 	 * Sanity check
 	 */
+	/*
+	 * For drivers who don't support max_num_buffers ensure
+	 * a backward compatibility.
+	 */
+	if (!q->max_num_buffers)
+		q->max_num_buffers = VB2_MAX_FRAME;
+
+	/* The maximum is limited by offset cookie encoding pattern */
+	q->max_num_buffers = min_t(unsigned int, q->max_num_buffers, MAX_BUFFER_INDEX);
+
 	if (WARN_ON(!q)			  ||
 	    WARN_ON(!q->ops)		  ||
 	    WARN_ON(!q->mem_ops)	  ||
@@ -2479,6 +2503,10 @@ int vb2_core_queue_init(struct vb2_queue *q)
 	    WARN_ON(!q->ops->buf_queue))
 		return -EINVAL;
 
+	if (WARN_ON(q->max_num_buffers > MAX_BUFFER_INDEX) ||
+	    WARN_ON(q->min_buffers_needed > q->max_num_buffers))
+		return -EINVAL;
+
 	if (WARN_ON(q->requires_requests && !q->supports_requests))
 		return -EINVAL;
 
@@ -2525,6 +2553,8 @@ void vb2_core_queue_release(struct vb2_queue *q)
 	__vb2_queue_cancel(q);
 	mutex_lock(&q->mmap_lock);
 	__vb2_queue_free(q, vb2_get_num_buffers(q));
+	kfree(q->bufs);
+	q->bufs = NULL;
 	mutex_unlock(&q->mmap_lock);
 }
 EXPORT_SYMBOL_GPL(vb2_core_queue_release);
diff --git a/drivers/media/common/videobuf2/videobuf2-v4l2.c b/drivers/media/common/videobuf2/videobuf2-v4l2.c
index 9d3b828cc804..3d71c205406d 100644
--- a/drivers/media/common/videobuf2/videobuf2-v4l2.c
+++ b/drivers/media/common/videobuf2/videobuf2-v4l2.c
@@ -621,7 +621,7 @@ struct vb2_buffer *vb2_find_buffer(struct vb2_queue *q, u64 timestamp)
 	 * This loop doesn't scale if there is a really large number of buffers.
 	 * Maybe something more efficient will be needed in this case.
 	 */
-	for (i = 0; i < vb2_get_num_buffers(q); i++) {
+	for (i = 0; i < q->max_num_buffers; i++) {
 		vb2 = vb2_get_buffer(q, i);
 
 		if (!vb2)
@@ -1136,7 +1136,7 @@ int _vb2_fop_release(struct file *file, struct mutex *lock)
 
 	if (lock)
 		mutex_lock(lock);
-	if (file->private_data == vdev->queue->owner) {
+	if (!vdev->queue->owner || file->private_data == vdev->queue->owner) {
 		vb2_queue_release(vdev->queue);
 		vdev->queue->owner = NULL;
 	}
@@ -1264,7 +1264,7 @@ void vb2_video_unregister_device(struct video_device *vdev)
 	 */
 	get_device(&vdev->dev);
 	video_unregister_device(vdev);
-	if (vdev->queue && vdev->queue->owner) {
+	if (vdev->queue) {
 		struct mutex *lock = vdev->queue->lock ?
 			vdev->queue->lock : vdev->lock;
 
diff --git a/include/media/videobuf2-core.h b/include/media/videobuf2-core.h
index 8f9d9e4af5b1..5557d78b6f20 100644
--- a/include/media/videobuf2-core.h
+++ b/include/media/videobuf2-core.h
@@ -558,6 +558,9 @@ struct vb2_buf_ops {
  * @dma_dir:	DMA mapping direction.
  * @bufs:	videobuf2 buffer structures
  * @num_buffers: number of allocated/used buffers
+ * @max_num_buffers: upper limit of number of allocated/used buffers.
+ *		     If set to 0 v4l2 core will change it VB2_MAX_FRAME
+ *		     for backward compatibility.
  * @queued_list: list of buffers currently queued from userspace
  * @queued_count: number of buffers queued and ready for streaming.
  * @owned_by_drv_count: number of buffers owned by the driver
@@ -619,8 +622,9 @@ struct vb2_queue {
 	struct mutex			mmap_lock;
 	unsigned int			memory;
 	enum dma_data_direction		dma_dir;
-	struct vb2_buffer		*bufs[VB2_MAX_FRAME];
+	struct vb2_buffer		**bufs;
 	unsigned int			num_buffers;
+	unsigned int			max_num_buffers;
 
 	struct list_head		queued_list;
 	unsigned int			queued_count;
@@ -1248,6 +1252,12 @@ static inline void vb2_clear_last_buffer_dequeued(struct vb2_queue *q)
 static inline struct vb2_buffer *vb2_get_buffer(struct vb2_queue *q,
 						unsigned int index)
 {
+	if (!q->bufs)
+		return NULL;
+
+	if (index >= q->max_num_buffers)
+		return NULL;
+
 	if (index < q->num_buffers)
 		return q->bufs[index];
 	return NULL;
-- 
2.39.2

[PATCH v15 44/56] media: core: Report the maximum possible number of buffers for the queue

[Benjamin Gaignard]

Use one of the struct v4l2_create_buffers reserved bytes to report
the maximum possible number of buffers for the queue.
V4l2 framework set V4L2_BUF_CAP_SUPPORTS_MAX_NUM_BUFFERS flags in queue
capabilities so userland can know when the field is valid.
Does the same change in v4l2_create_buffers32 structure.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>
---
 .../userspace-api/media/v4l/vidioc-create-bufs.rst     |  8 ++++++--
 .../userspace-api/media/v4l/vidioc-reqbufs.rst         |  1 +
 drivers/media/common/videobuf2/videobuf2-v4l2.c        |  2 ++
 drivers/media/v4l2-core/v4l2-compat-ioctl32.c          | 10 +++++++++-
 drivers/media/v4l2-core/v4l2-ioctl.c                   |  4 ++--
 include/uapi/linux/videodev2.h                         |  7 ++++++-
 6 files changed, 26 insertions(+), 6 deletions(-)

diff --git a/Documentation/userspace-api/media/v4l/vidioc-create-bufs.rst b/Documentation/userspace-api/media/v4l/vidioc-create-bufs.rst
index a048a9f6b7b6..49232c9006c2 100644
--- a/Documentation/userspace-api/media/v4l/vidioc-create-bufs.rst
+++ b/Documentation/userspace-api/media/v4l/vidioc-create-bufs.rst
@@ -116,9 +116,13 @@ than the number requested.
       - ``flags``
       - Specifies additional buffer management attributes.
 	See :ref:`memory-flags`.
-
     * - __u32
-      - ``reserved``\ [6]
+      - ``max_num_buffers``
+      - If the V4L2_BUF_CAP_SUPPORTS_MAX_NUM_BUFFERS capability flag is set
+        this field indicates the maximum possible number of buffers
+        for this queue.
+    * - __u32
+      - ``reserved``\ [5]
       - A place holder for future extensions. Drivers and applications
 	must set the array to zero.
 
diff --git a/Documentation/userspace-api/media/v4l/vidioc-reqbufs.rst b/Documentation/userspace-api/media/v4l/vidioc-reqbufs.rst
index 099fa6695167..0b3a41a45d05 100644
--- a/Documentation/userspace-api/media/v4l/vidioc-reqbufs.rst
+++ b/Documentation/userspace-api/media/v4l/vidioc-reqbufs.rst
@@ -120,6 +120,7 @@ aborting or finishing any DMA in progress, an implicit
 .. _V4L2-BUF-CAP-SUPPORTS-ORPHANED-BUFS:
 .. _V4L2-BUF-CAP-SUPPORTS-M2M-HOLD-CAPTURE-BUF:
 .. _V4L2-BUF-CAP-SUPPORTS-MMAP-CACHE-HINTS:
+.. _V4L2-BUF-CAP-SUPPORTS-MAX-NUM-BUFFERS:
 
 .. raw:: latex
 
diff --git a/drivers/media/common/videobuf2/videobuf2-v4l2.c b/drivers/media/common/videobuf2/videobuf2-v4l2.c
index 3d71c205406d..440c3b1c18ec 100644
--- a/drivers/media/common/videobuf2/videobuf2-v4l2.c
+++ b/drivers/media/common/videobuf2/videobuf2-v4l2.c
@@ -756,6 +756,8 @@ int vb2_create_bufs(struct vb2_queue *q, struct v4l2_create_buffers *create)
 	fill_buf_caps(q, &create->capabilities);
 	validate_memory_flags(q, create->memory, &create->flags);
 	create->index = vb2_get_num_buffers(q);
+	create->max_num_buffers = q->max_num_buffers;
+	create->capabilities |= V4L2_BUF_CAP_SUPPORTS_MAX_NUM_BUFFERS;
 	if (create->count == 0)
 		return ret != -EBUSY ? ret : 0;
 
diff --git a/drivers/media/v4l2-core/v4l2-compat-ioctl32.c b/drivers/media/v4l2-core/v4l2-compat-ioctl32.c
index f3bed37859a2..8c07400bd280 100644
--- a/drivers/media/v4l2-core/v4l2-compat-ioctl32.c
+++ b/drivers/media/v4l2-core/v4l2-compat-ioctl32.c
@@ -116,6 +116,9 @@ struct v4l2_format32 {
  * @flags:	additional buffer management attributes (ignored unless the
  *		queue has V4L2_BUF_CAP_SUPPORTS_MMAP_CACHE_HINTS capability and
  *		configured for MMAP streaming I/O).
+ * @max_num_buffers: if V4L2_BUF_CAP_SUPPORTS_MAX_NUM_BUFFERS capability flag is set
+ *		this field indicate the maximum possible number of buffers
+ *		for this queue.
  * @reserved:	future extensions
  */
 struct v4l2_create_buffers32 {
@@ -125,7 +128,8 @@ struct v4l2_create_buffers32 {
 	struct v4l2_format32	format;
 	__u32			capabilities;
 	__u32			flags;
-	__u32			reserved[6];
+	__u32			max_num_buffers;
+	__u32			reserved[5];
 };
 
 static int get_v4l2_format32(struct v4l2_format *p64,
@@ -175,6 +179,9 @@ static int get_v4l2_create32(struct v4l2_create_buffers *p64,
 		return -EFAULT;
 	if (copy_from_user(&p64->flags, &p32->flags, sizeof(p32->flags)))
 		return -EFAULT;
+	if (copy_from_user(&p64->max_num_buffers, &p32->max_num_buffers,
+			   sizeof(p32->max_num_buffers)))
+		return -EFAULT;
 	return get_v4l2_format32(&p64->format, &p32->format);
 }
 
@@ -221,6 +228,7 @@ static int put_v4l2_create32(struct v4l2_create_buffers *p64,
 			 offsetof(struct v4l2_create_buffers32, format)) ||
 	    put_user(p64->capabilities, &p32->capabilities) ||
 	    put_user(p64->flags, &p32->flags) ||
+	    put_user(p64->max_num_buffers, &p32->max_num_buffers) ||
 	    copy_to_user(p32->reserved, p64->reserved, sizeof(p64->reserved)))
 		return -EFAULT;
 	return put_v4l2_format32(&p64->format, &p32->format);
diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c
index 9b1de54ce379..4d90424cbfc4 100644
--- a/drivers/media/v4l2-core/v4l2-ioctl.c
+++ b/drivers/media/v4l2-core/v4l2-ioctl.c
@@ -483,9 +483,9 @@ static void v4l_print_create_buffers(const void *arg, bool write_only)
 {
 	const struct v4l2_create_buffers *p = arg;
 
-	pr_cont("index=%d, count=%d, memory=%s, capabilities=0x%08x, ",
+	pr_cont("index=%d, count=%d, memory=%s, capabilities=0x%08x, max num buffers=%u",
 		p->index, p->count, prt_names(p->memory, v4l2_memory_names),
-		p->capabilities);
+		p->capabilities, p->max_num_buffers);
 	v4l_print_format(&p->format, write_only);
 }
 
diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
index c3d4e490ce7c..13ddb5abf584 100644
--- a/include/uapi/linux/videodev2.h
+++ b/include/uapi/linux/videodev2.h
@@ -1035,6 +1035,7 @@ struct v4l2_requestbuffers {
 #define V4L2_BUF_CAP_SUPPORTS_ORPHANED_BUFS		(1 << 4)
 #define V4L2_BUF_CAP_SUPPORTS_M2M_HOLD_CAPTURE_BUF	(1 << 5)
 #define V4L2_BUF_CAP_SUPPORTS_MMAP_CACHE_HINTS		(1 << 6)
+#define V4L2_BUF_CAP_SUPPORTS_MAX_NUM_BUFFERS		(1 << 7)
 
 /**
  * struct v4l2_plane - plane info for multi-planar buffers
@@ -2605,6 +2606,9 @@ struct v4l2_dbg_chip_info {
  * @flags:	additional buffer management attributes (ignored unless the
  *		queue has V4L2_BUF_CAP_SUPPORTS_MMAP_CACHE_HINTS capability
  *		and configured for MMAP streaming I/O).
+ * @max_num_buffers: if V4L2_BUF_CAP_SUPPORTS_MAX_NUM_BUFFERS capability flag is set
+ *		this field indicate the maximum possible number of buffers
+ *		for this queue.
  * @reserved:	future extensions
  */
 struct v4l2_create_buffers {
@@ -2614,7 +2618,8 @@ struct v4l2_create_buffers {
 	struct v4l2_format	format;
 	__u32			capabilities;
 	__u32			flags;
-	__u32			reserved[6];
+	__u32			max_num_buffers;
+	__u32			reserved[5];
 };
 
 /*
-- 
2.39.2

[PATCH v15 45/56] media: test-drivers: vivid: Increase max supported buffers for capture queues

[Benjamin Gaignard]

Change the maximum number of buffers of some capture queues in order
to test max_num_buffers field.

Allow to allocate up to:
- 64 buffers for video capture queue.
- 1024 buffers for sdr capture queue.
- 32768 buffers for vbi capture queue.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>
Reviewed-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com>
---
 drivers/media/test-drivers/vivid/vivid-core.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/drivers/media/test-drivers/vivid/vivid-core.c b/drivers/media/test-drivers/vivid/vivid-core.c
index 394c9f81ea72..353f035fcd19 100644
--- a/drivers/media/test-drivers/vivid/vivid-core.c
+++ b/drivers/media/test-drivers/vivid/vivid-core.c
@@ -876,6 +876,20 @@ static int vivid_create_queue(struct vivid_dev *dev,
 	q->type = buf_type;
 	q->io_modes = VB2_MMAP | VB2_DMABUF;
 	q->io_modes |= V4L2_TYPE_IS_OUTPUT(buf_type) ?  VB2_WRITE : VB2_READ;
+
+	/*
+	 * The maximum number of buffers is 32768 if PAGE_SHIFT == 12,
+	 * see also MAX_BUFFER_INDEX in videobuf2-core.c. It will be less if
+	 * PAGE_SHIFT > 12, but then max_num_buffers will be clamped by
+	 * videobuf2-core.c to MAX_BUFFER_INDEX.
+	 */
+	if (buf_type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
+		q->max_num_buffers = 64;
+	if (buf_type == V4L2_BUF_TYPE_SDR_CAPTURE)
+		q->max_num_buffers = 1024;
+	if (buf_type == V4L2_BUF_TYPE_VBI_CAPTURE)
+		q->max_num_buffers = 32768;
+
 	if (allocators[dev->inst] != 1)
 		q->io_modes |= VB2_USERPTR;
 	q->drv_priv = dev;
-- 
2.39.2

[PATCH v15 46/56] media: test-drivers: vicodec: Increase max supported capture queue buffers

[Benjamin Gaignard]

Allow to allocated up to 64 buffers on capture queue.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>
Reviewed-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com>
---
 drivers/media/test-drivers/vicodec/vicodec-core.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/media/test-drivers/vicodec/vicodec-core.c b/drivers/media/test-drivers/vicodec/vicodec-core.c
index 6f0e20df74e9..69cbe2c094e1 100644
--- a/drivers/media/test-drivers/vicodec/vicodec-core.c
+++ b/drivers/media/test-drivers/vicodec/vicodec-core.c
@@ -1718,6 +1718,7 @@ static int queue_init(void *priv, struct vb2_queue *src_vq,
 			V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE :
 			V4L2_BUF_TYPE_VIDEO_CAPTURE);
 	dst_vq->io_modes = VB2_MMAP | VB2_USERPTR | VB2_DMABUF;
+	dst_vq->max_num_buffers = 64;
 	dst_vq->drv_priv = ctx;
 	dst_vq->buf_struct_size = sizeof(struct v4l2_m2m_buffer);
 	dst_vq->ops = &vicodec_qops;
-- 
2.39.2

[PATCH v15 47/56] media: verisilicon: Refactor postprocessor to store more buffers

[Benjamin Gaignard]

Since vb2 queue can store more than VB2_MAX_FRAME buffers, the
postprocessor buffer storage must be capable to store more buffers too.
Change static dec_q array to allocated array to be capable to store
up to queue 'max_num_buffers'.
Keep allocating queue 'num_buffers' at queue setup time but also allows
to allocate postprocessors buffers on the fly.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>
Reviewed-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com>
CC: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>
CC: Philipp Zabel <p.zabel@pengutronix.de>
---
 drivers/media/platform/verisilicon/hantro.h   |  7 +-
 .../media/platform/verisilicon/hantro_drv.c   |  4 +-
 .../media/platform/verisilicon/hantro_hw.h    |  4 +-
 .../platform/verisilicon/hantro_postproc.c    | 93 +++++++++++++++----
 .../media/platform/verisilicon/hantro_v4l2.c  |  2 +-
 5 files changed, 85 insertions(+), 25 deletions(-)

diff --git a/drivers/media/platform/verisilicon/hantro.h b/drivers/media/platform/verisilicon/hantro.h
index 77aee9489516..0948b04a9f8d 100644
--- a/drivers/media/platform/verisilicon/hantro.h
+++ b/drivers/media/platform/verisilicon/hantro.h
@@ -469,11 +469,14 @@ hantro_get_dst_buf(struct hantro_ctx *ctx)
 bool hantro_needs_postproc(const struct hantro_ctx *ctx,
 			   const struct hantro_fmt *fmt);
 
+dma_addr_t
+hantro_postproc_get_dec_buf_addr(struct hantro_ctx *ctx, int index);
+
 static inline dma_addr_t
 hantro_get_dec_buf_addr(struct hantro_ctx *ctx, struct vb2_buffer *vb)
 {
 	if (hantro_needs_postproc(ctx, ctx->vpu_dst_fmt))
-		return ctx->postproc.dec_q[vb->index].dma;
+		return hantro_postproc_get_dec_buf_addr(ctx, vb->index);
 	return vb2_dma_contig_plane_dma_addr(vb, 0);
 }
 
@@ -485,8 +488,8 @@ vb2_to_hantro_decoded_buf(struct vb2_buffer *buf)
 
 void hantro_postproc_disable(struct hantro_ctx *ctx);
 void hantro_postproc_enable(struct hantro_ctx *ctx);
+int hantro_postproc_init(struct hantro_ctx *ctx);
 void hantro_postproc_free(struct hantro_ctx *ctx);
-int hantro_postproc_alloc(struct hantro_ctx *ctx);
 int hanto_postproc_enum_framesizes(struct hantro_ctx *ctx,
 				   struct v4l2_frmsizeenum *fsize);
 
diff --git a/drivers/media/platform/verisilicon/hantro_drv.c b/drivers/media/platform/verisilicon/hantro_drv.c
index a9fa05ac56a9..7f5b82eb6649 100644
--- a/drivers/media/platform/verisilicon/hantro_drv.c
+++ b/drivers/media/platform/verisilicon/hantro_drv.c
@@ -235,8 +235,10 @@ queue_init(void *priv, struct vb2_queue *src_vq, struct vb2_queue *dst_vq)
 	 * The Kernel needs access to the JPEG destination buffer for the
 	 * JPEG encoder to fill in the JPEG headers.
 	 */
-	if (!ctx->is_encoder)
+	if (!ctx->is_encoder) {
 		dst_vq->dma_attrs |= DMA_ATTR_NO_KERNEL_MAPPING;
+		dst_vq->max_num_buffers = MAX_POSTPROC_BUFFERS;
+	}
 
 	dst_vq->type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
 	dst_vq->io_modes = VB2_MMAP | VB2_DMABUF;
diff --git a/drivers/media/platform/verisilicon/hantro_hw.h b/drivers/media/platform/verisilicon/hantro_hw.h
index 7f33f7b07ce4..292a76ef643e 100644
--- a/drivers/media/platform/verisilicon/hantro_hw.h
+++ b/drivers/media/platform/verisilicon/hantro_hw.h
@@ -40,6 +40,8 @@
 
 #define AV1_MAX_FRAME_BUF_COUNT	(V4L2_AV1_TOTAL_REFS_PER_FRAME + 1)
 
+#define MAX_POSTPROC_BUFFERS	64
+
 struct hantro_dev;
 struct hantro_ctx;
 struct hantro_buf;
@@ -336,7 +338,7 @@ struct hantro_av1_dec_hw_ctx {
  * @dec_q:		References buffers, in decoder format.
  */
 struct hantro_postproc_ctx {
-	struct hantro_aux_buf dec_q[VB2_MAX_FRAME];
+	struct hantro_aux_buf dec_q[MAX_POSTPROC_BUFFERS];
 };
 
 /**
diff --git a/drivers/media/platform/verisilicon/hantro_postproc.c b/drivers/media/platform/verisilicon/hantro_postproc.c
index 8f8f17e671ce..41e93176300b 100644
--- a/drivers/media/platform/verisilicon/hantro_postproc.c
+++ b/drivers/media/platform/verisilicon/hantro_postproc.c
@@ -177,9 +177,11 @@ static int hantro_postproc_g2_enum_framesizes(struct hantro_ctx *ctx,
 void hantro_postproc_free(struct hantro_ctx *ctx)
 {
 	struct hantro_dev *vpu = ctx->dev;
+	struct v4l2_m2m_ctx *m2m_ctx = ctx->fh.m2m_ctx;
+	struct vb2_queue *queue = &m2m_ctx->cap_q_ctx.q;
 	unsigned int i;
 
-	for (i = 0; i < VB2_MAX_FRAME; ++i) {
+	for (i = 0; i < queue->max_num_buffers; ++i) {
 		struct hantro_aux_buf *priv = &ctx->postproc.dec_q[i];
 
 		if (priv->cpu) {
@@ -190,20 +192,17 @@ void hantro_postproc_free(struct hantro_ctx *ctx)
 	}
 }
 
-int hantro_postproc_alloc(struct hantro_ctx *ctx)
+static unsigned int hantro_postproc_buffer_size(struct hantro_ctx *ctx)
 {
-	struct hantro_dev *vpu = ctx->dev;
-	struct v4l2_m2m_ctx *m2m_ctx = ctx->fh.m2m_ctx;
-	struct vb2_queue *cap_queue = &m2m_ctx->cap_q_ctx.q;
-	unsigned int num_buffers = vb2_get_num_buffers(cap_queue);
 	struct v4l2_pix_format_mplane pix_mp;
 	const struct hantro_fmt *fmt;
-	unsigned int i, buf_size;
+	unsigned int buf_size;
 
 	/* this should always pick native format */
 	fmt = hantro_get_default_fmt(ctx, false, ctx->bit_depth, HANTRO_AUTO_POSTPROC);
 	if (!fmt)
-		return -EINVAL;
+		return 0;
+
 	v4l2_fill_pixfmt_mp(&pix_mp, fmt->fourcc, ctx->src_fmt.width,
 			    ctx->src_fmt.height);
 
@@ -221,23 +220,77 @@ int hantro_postproc_alloc(struct hantro_ctx *ctx)
 		buf_size += hantro_av1_mv_size(pix_mp.width,
 					       pix_mp.height);
 
-	for (i = 0; i < num_buffers; ++i) {
-		struct hantro_aux_buf *priv = &ctx->postproc.dec_q[i];
+	return buf_size;
+}
+
+static int hantro_postproc_alloc(struct hantro_ctx *ctx, int index)
+{
+	struct hantro_dev *vpu = ctx->dev;
+	struct hantro_aux_buf *priv = &ctx->postproc.dec_q[index];
+	unsigned int buf_size = hantro_postproc_buffer_size(ctx);
+
+	if (!buf_size)
+		return -EINVAL;
+
+	/*
+	 * The buffers on this queue are meant as intermediate
+	 * buffers for the decoder, so no mapping is needed.
+	 */
+	priv->attrs = DMA_ATTR_NO_KERNEL_MAPPING;
+	priv->cpu = dma_alloc_attrs(vpu->dev, buf_size, &priv->dma,
+				    GFP_KERNEL, priv->attrs);
+	if (!priv->cpu)
+		return -ENOMEM;
+	priv->size = buf_size;
+
+	return 0;
+}
 
-		/*
-		 * The buffers on this queue are meant as intermediate
-		 * buffers for the decoder, so no mapping is needed.
-		 */
-		priv->attrs = DMA_ATTR_NO_KERNEL_MAPPING;
-		priv->cpu = dma_alloc_attrs(vpu->dev, buf_size, &priv->dma,
-					    GFP_KERNEL, priv->attrs);
-		if (!priv->cpu)
-			return -ENOMEM;
-		priv->size = buf_size;
+int hantro_postproc_init(struct hantro_ctx *ctx)
+{
+	struct v4l2_m2m_ctx *m2m_ctx = ctx->fh.m2m_ctx;
+	struct vb2_queue *cap_queue = &m2m_ctx->cap_q_ctx.q;
+	unsigned int num_buffers = vb2_get_num_buffers(cap_queue);
+	unsigned int i;
+	int ret;
+
+	for (i = 0; i < num_buffers; i++) {
+		ret = hantro_postproc_alloc(ctx, i);
+		if (ret)
+			return ret;
 	}
+
 	return 0;
 }
 
+dma_addr_t
+hantro_postproc_get_dec_buf_addr(struct hantro_ctx *ctx, int index)
+{
+	struct hantro_aux_buf *priv = &ctx->postproc.dec_q[index];
+	unsigned int buf_size = hantro_postproc_buffer_size(ctx);
+	struct hantro_dev *vpu = ctx->dev;
+	int ret;
+
+	if (priv->size < buf_size && priv->cpu) {
+		/* buffer is too small, release it */
+		dma_free_attrs(vpu->dev, priv->size, priv->cpu,
+			       priv->dma, priv->attrs);
+		priv->cpu = NULL;
+	}
+
+	if (!priv->cpu) {
+		/* buffer not already allocated, try getting a new one */
+		ret = hantro_postproc_alloc(ctx, index);
+		if (ret)
+			return 0;
+	}
+
+	if (!priv->cpu)
+		return 0;
+
+	return priv->dma;
+}
+
 static void hantro_postproc_g1_disable(struct hantro_ctx *ctx)
 {
 	struct hantro_dev *vpu = ctx->dev;
diff --git a/drivers/media/platform/verisilicon/hantro_v4l2.c b/drivers/media/platform/verisilicon/hantro_v4l2.c
index b3ae037a50f6..f0d8b165abcd 100644
--- a/drivers/media/platform/verisilicon/hantro_v4l2.c
+++ b/drivers/media/platform/verisilicon/hantro_v4l2.c
@@ -933,7 +933,7 @@ static int hantro_start_streaming(struct vb2_queue *q, unsigned int count)
 		}
 
 		if (hantro_needs_postproc(ctx, ctx->vpu_dst_fmt)) {
-			ret = hantro_postproc_alloc(ctx);
+			ret = hantro_postproc_init(ctx);
 			if (ret)
 				goto err_codec_exit;
 		}
-- 
2.39.2

[PATCH v15 48/56] media: verisilicon: Store chroma and motion vectors offset

[Benjamin Gaignard]

Store computed values of chroma and motion vectors offset because
they depends on width and height values which change if the resolution
change.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>
Reviewed-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com>
CC: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>
CC: Philipp Zabel <p.zabel@pengutronix.de>
---
 drivers/media/platform/verisilicon/hantro.h            | 2 ++
 drivers/media/platform/verisilicon/hantro_g2_vp9_dec.c | 6 ++++--
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/media/platform/verisilicon/hantro.h b/drivers/media/platform/verisilicon/hantro.h
index 0948b04a9f8d..6f5eb975d0e3 100644
--- a/drivers/media/platform/verisilicon/hantro.h
+++ b/drivers/media/platform/verisilicon/hantro.h
@@ -328,6 +328,8 @@ struct hantro_vp9_decoded_buffer_info {
 	/* Info needed when the decoded frame serves as a reference frame. */
 	unsigned short width;
 	unsigned short height;
+	size_t chroma_offset;
+	size_t mv_offset;
 	u32 bit_depth : 4;
 };
 
diff --git a/drivers/media/platform/verisilicon/hantro_g2_vp9_dec.c b/drivers/media/platform/verisilicon/hantro_g2_vp9_dec.c
index 6fc4b555517f..6db1c32fce4d 100644
--- a/drivers/media/platform/verisilicon/hantro_g2_vp9_dec.c
+++ b/drivers/media/platform/verisilicon/hantro_g2_vp9_dec.c
@@ -158,9 +158,11 @@ static void config_output(struct hantro_ctx *ctx,
 
 	chroma_addr = luma_addr + chroma_offset(ctx, dec_params);
 	hantro_write_addr(ctx->dev, G2_OUT_CHROMA_ADDR, chroma_addr);
+	dst->vp9.chroma_offset = chroma_offset(ctx, dec_params);
 
 	mv_addr = luma_addr + mv_offset(ctx, dec_params);
 	hantro_write_addr(ctx->dev, G2_OUT_MV_ADDR, mv_addr);
+	dst->vp9.mv_offset = mv_offset(ctx, dec_params);
 }
 
 struct hantro_vp9_ref_reg {
@@ -195,7 +197,7 @@ static void config_ref(struct hantro_ctx *ctx,
 	luma_addr = hantro_get_dec_buf_addr(ctx, &buf->base.vb.vb2_buf);
 	hantro_write_addr(ctx->dev, ref_reg->y_base, luma_addr);
 
-	chroma_addr = luma_addr + chroma_offset(ctx, dec_params);
+	chroma_addr = luma_addr + buf->vp9.chroma_offset;
 	hantro_write_addr(ctx->dev, ref_reg->c_base, chroma_addr);
 }
 
@@ -238,7 +240,7 @@ static void config_ref_registers(struct hantro_ctx *ctx,
 	config_ref(ctx, dst, &ref_regs[2], dec_params, dec_params->alt_frame_ts);
 
 	mv_addr = hantro_get_dec_buf_addr(ctx, &mv_ref->base.vb.vb2_buf) +
-		  mv_offset(ctx, dec_params);
+		  mv_ref->vp9.mv_offset;
 	hantro_write_addr(ctx->dev, G2_REF_MV_ADDR(0), mv_addr);
 
 	hantro_reg_write(ctx->dev, &vp9_last_sign_bias,
-- 
2.39.2

[PATCH v15 49/56] media: verisilicon: g2: Use common helpers to compute chroma and mv offsets

[Benjamin Gaignard]

HEVC and VP9 are running on the same hardware and share the same
chroma and motion vectors offset constraint.
Create common helpers functions for these computation.
Source and destination buffer height may not be the same because
alignment constraint are different so use destination height to
compute chroma offset because we target this buffer as hardware
output.
To be able to use the helpers in both VP9 HEVC code remove dec_params
and use context->bit_depth instead.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>
Reviewed-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com>
CC: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>
CC: Philipp Zabel <p.zabel@pengutronix.de>
---
 .../media/platform/verisilicon/hantro_g2.c    | 14 ++++++++++
 .../platform/verisilicon/hantro_g2_hevc_dec.c | 18 ++-----------
 .../platform/verisilicon/hantro_g2_vp9_dec.c  | 26 +++----------------
 .../media/platform/verisilicon/hantro_hw.h    |  3 +++
 4 files changed, 23 insertions(+), 38 deletions(-)

diff --git a/drivers/media/platform/verisilicon/hantro_g2.c b/drivers/media/platform/verisilicon/hantro_g2.c
index ee5f14c5f8f2..b880a6849d58 100644
--- a/drivers/media/platform/verisilicon/hantro_g2.c
+++ b/drivers/media/platform/verisilicon/hantro_g2.c
@@ -8,6 +8,8 @@
 #include "hantro_hw.h"
 #include "hantro_g2_regs.h"
 
+#define G2_ALIGN	16
+
 void hantro_g2_check_idle(struct hantro_dev *vpu)
 {
 	int i;
@@ -42,3 +44,15 @@ irqreturn_t hantro_g2_irq(int irq, void *dev_id)
 
 	return IRQ_HANDLED;
 }
+
+size_t hantro_g2_chroma_offset(struct hantro_ctx *ctx)
+{
+	return ctx->dst_fmt.width * ctx->dst_fmt.height * ctx->bit_depth / 8;
+}
+
+size_t hantro_g2_motion_vectors_offset(struct hantro_ctx *ctx)
+{
+	size_t cr_offset = hantro_g2_chroma_offset(ctx);
+
+	return ALIGN((cr_offset * 3) / 2, G2_ALIGN);
+}
diff --git a/drivers/media/platform/verisilicon/hantro_g2_hevc_dec.c b/drivers/media/platform/verisilicon/hantro_g2_hevc_dec.c
index a9d4ac84a8d8..d3f8c33eb16c 100644
--- a/drivers/media/platform/verisilicon/hantro_g2_hevc_dec.c
+++ b/drivers/media/platform/verisilicon/hantro_g2_hevc_dec.c
@@ -8,20 +8,6 @@
 #include "hantro_hw.h"
 #include "hantro_g2_regs.h"
 
-#define G2_ALIGN	16
-
-static size_t hantro_hevc_chroma_offset(struct hantro_ctx *ctx)
-{
-	return ctx->dst_fmt.width * ctx->dst_fmt.height * ctx->bit_depth / 8;
-}
-
-static size_t hantro_hevc_motion_vectors_offset(struct hantro_ctx *ctx)
-{
-	size_t cr_offset = hantro_hevc_chroma_offset(ctx);
-
-	return ALIGN((cr_offset * 3) / 2, G2_ALIGN);
-}
-
 static void prepare_tile_info_buffer(struct hantro_ctx *ctx)
 {
 	struct hantro_dev *vpu = ctx->dev;
@@ -384,8 +370,8 @@ static int set_ref(struct hantro_ctx *ctx)
 	struct hantro_dev *vpu = ctx->dev;
 	struct vb2_v4l2_buffer *vb2_dst;
 	struct hantro_decoded_buffer *dst;
-	size_t cr_offset = hantro_hevc_chroma_offset(ctx);
-	size_t mv_offset = hantro_hevc_motion_vectors_offset(ctx);
+	size_t cr_offset = hantro_g2_chroma_offset(ctx);
+	size_t mv_offset = hantro_g2_motion_vectors_offset(ctx);
 	u32 max_ref_frames;
 	u16 dpb_longterm_e;
 	static const struct hantro_reg cur_poc[] = {
diff --git a/drivers/media/platform/verisilicon/hantro_g2_vp9_dec.c b/drivers/media/platform/verisilicon/hantro_g2_vp9_dec.c
index 6db1c32fce4d..342e543dee4c 100644
--- a/drivers/media/platform/verisilicon/hantro_g2_vp9_dec.c
+++ b/drivers/media/platform/verisilicon/hantro_g2_vp9_dec.c
@@ -16,8 +16,6 @@
 #include "hantro_vp9.h"
 #include "hantro_g2_regs.h"
 
-#define G2_ALIGN 16
-
 enum hantro_ref_frames {
 	INTRA_FRAME = 0,
 	LAST_FRAME = 1,
@@ -90,22 +88,6 @@ static int start_prepare_run(struct hantro_ctx *ctx, const struct v4l2_ctrl_vp9_
 	return 0;
 }
 
-static size_t chroma_offset(const struct hantro_ctx *ctx,
-			    const struct v4l2_ctrl_vp9_frame *dec_params)
-{
-	int bytes_per_pixel = dec_params->bit_depth == 8 ? 1 : 2;
-
-	return ctx->src_fmt.width * ctx->src_fmt.height * bytes_per_pixel;
-}
-
-static size_t mv_offset(const struct hantro_ctx *ctx,
-			const struct v4l2_ctrl_vp9_frame *dec_params)
-{
-	size_t cr_offset = chroma_offset(ctx, dec_params);
-
-	return ALIGN((cr_offset * 3) / 2, G2_ALIGN);
-}
-
 static struct hantro_decoded_buffer *
 get_ref_buf(struct hantro_ctx *ctx, struct vb2_v4l2_buffer *dst, u64 timestamp)
 {
@@ -156,13 +138,13 @@ static void config_output(struct hantro_ctx *ctx,
 	luma_addr = hantro_get_dec_buf_addr(ctx, &dst->base.vb.vb2_buf);
 	hantro_write_addr(ctx->dev, G2_OUT_LUMA_ADDR, luma_addr);
 
-	chroma_addr = luma_addr + chroma_offset(ctx, dec_params);
+	chroma_addr = luma_addr + hantro_g2_chroma_offset(ctx);
 	hantro_write_addr(ctx->dev, G2_OUT_CHROMA_ADDR, chroma_addr);
-	dst->vp9.chroma_offset = chroma_offset(ctx, dec_params);
+	dst->vp9.chroma_offset = hantro_g2_chroma_offset(ctx);
 
-	mv_addr = luma_addr + mv_offset(ctx, dec_params);
+	mv_addr = luma_addr + hantro_g2_motion_vectors_offset(ctx);
 	hantro_write_addr(ctx->dev, G2_OUT_MV_ADDR, mv_addr);
-	dst->vp9.mv_offset = mv_offset(ctx, dec_params);
+	dst->vp9.mv_offset = hantro_g2_motion_vectors_offset(ctx);
 }
 
 struct hantro_vp9_ref_reg {
diff --git a/drivers/media/platform/verisilicon/hantro_hw.h b/drivers/media/platform/verisilicon/hantro_hw.h
index 292a76ef643e..9aec8a79acdc 100644
--- a/drivers/media/platform/verisilicon/hantro_hw.h
+++ b/drivers/media/platform/verisilicon/hantro_hw.h
@@ -521,6 +521,9 @@ hantro_av1_mv_size(unsigned int width, unsigned int height)
 	return ALIGN(num_sbs * 384, 16) * 2 + 512;
 }
 
+size_t hantro_g2_chroma_offset(struct hantro_ctx *ctx);
+size_t hantro_g2_motion_vectors_offset(struct hantro_ctx *ctx);
+
 int hantro_g1_mpeg2_dec_run(struct hantro_ctx *ctx);
 int rockchip_vpu2_mpeg2_dec_run(struct hantro_ctx *ctx);
 void hantro_mpeg2_dec_copy_qtable(u8 *qtable,
-- 
2.39.2

[PATCH v15 50/56] media: verisilicon: vp9: Allow to change resolution while streaming

[Benjamin Gaignard]

Remove all checks that prohibit to set a new format while streaming.
This allow to change dynamically the resolution if the pixel format
remains the same.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>
Reviewed-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com>
CC: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>
CC: Philipp Zabel <p.zabel@pengutronix.de>
---
 .../media/platform/verisilicon/hantro_v4l2.c  | 24 +++----------------
 1 file changed, 3 insertions(+), 21 deletions(-)

diff --git a/drivers/media/platform/verisilicon/hantro_v4l2.c b/drivers/media/platform/verisilicon/hantro_v4l2.c
index f0d8b165abcd..27a1e77cca38 100644
--- a/drivers/media/platform/verisilicon/hantro_v4l2.c
+++ b/drivers/media/platform/verisilicon/hantro_v4l2.c
@@ -514,25 +514,14 @@ static int hantro_set_fmt_out(struct hantro_ctx *ctx,
 		return ret;
 
 	if (!ctx->is_encoder) {
-		struct vb2_queue *peer_vq;
-
 		/*
 		 * In order to support dynamic resolution change,
 		 * the decoder admits a resolution change, as long
-		 * as the pixelformat remains. Can't be done if streaming.
-		 */
-		if (vb2_is_streaming(vq) || (vb2_is_busy(vq) &&
-		    pix_mp->pixelformat != ctx->src_fmt.pixelformat))
-			return -EBUSY;
-		/*
-		 * Since format change on the OUTPUT queue will reset
-		 * the CAPTURE queue, we can't allow doing so
-		 * when the CAPTURE queue has buffers allocated.
+		 * as the pixelformat remains.
 		 */
-		peer_vq = v4l2_m2m_get_vq(ctx->fh.m2m_ctx,
-					  V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE);
-		if (vb2_is_busy(peer_vq))
+		if (vb2_is_streaming(vq) && pix_mp->pixelformat != ctx->src_fmt.pixelformat) {
 			return -EBUSY;
+		}
 	} else {
 		/*
 		 * The encoder doesn't admit a format change if
@@ -577,15 +566,8 @@ static int hantro_set_fmt_out(struct hantro_ctx *ctx,
 static int hantro_set_fmt_cap(struct hantro_ctx *ctx,
 			      struct v4l2_pix_format_mplane *pix_mp)
 {
-	struct vb2_queue *vq;
 	int ret;
 
-	/* Change not allowed if queue is busy. */
-	vq = v4l2_m2m_get_vq(ctx->fh.m2m_ctx,
-			     V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE);
-	if (vb2_is_busy(vq))
-		return -EBUSY;
-
 	if (ctx->is_encoder) {
 		struct vb2_queue *peer_vq;
 
-- 
2.39.2

[PATCH v15 51/56] media: core: Rework how create_buf index returned value is computed

[Benjamin Gaignard]

When DELETE_BUFS will be introduced holes could created in bufs array.
To be able to reuse these unused indices reworking how create->index
is set is mandatory.
Let __vb2_queue_alloc() decide which first index is correct and
forward this to the caller.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>
---
 .../media/common/videobuf2/videobuf2-core.c   | 22 ++++++++++++-------
 .../media/common/videobuf2/videobuf2-v4l2.c   | 20 +++++++++++------
 include/media/videobuf2-core.h                |  5 ++++-
 3 files changed, 31 insertions(+), 16 deletions(-)

diff --git a/drivers/media/common/videobuf2/videobuf2-core.c b/drivers/media/common/videobuf2/videobuf2-core.c
index 8c1df829745b..6379f8171405 100644
--- a/drivers/media/common/videobuf2/videobuf2-core.c
+++ b/drivers/media/common/videobuf2/videobuf2-core.c
@@ -447,11 +447,12 @@ static void vb2_queue_remove_buffer(struct vb2_buffer *vb)
  */
 static int __vb2_queue_alloc(struct vb2_queue *q, enum vb2_memory memory,
 			     unsigned int num_buffers, unsigned int num_planes,
-			     const unsigned plane_sizes[VB2_MAX_PLANES])
+			     const unsigned int plane_sizes[VB2_MAX_PLANES],
+			     unsigned int *first_index)
 {
-	unsigned int q_num_buffers = vb2_get_num_buffers(q);
 	unsigned int buffer, plane;
 	struct vb2_buffer *vb;
+	unsigned long index;
 	int ret;
 
 	/*
@@ -459,7 +460,11 @@ static int __vb2_queue_alloc(struct vb2_queue *q, enum vb2_memory memory,
 	 * in the queue is below q->max_num_buffers
 	 */
 	num_buffers = min_t(unsigned int, num_buffers,
-			    q->max_num_buffers - q_num_buffers);
+			    q->max_num_buffers - vb2_get_num_buffers(q));
+
+	index = vb2_get_num_buffers(q);
+
+	*first_index = index;
 
 	for (buffer = 0; buffer < num_buffers; ++buffer) {
 		/* Allocate vb2 buffer structures */
@@ -479,7 +484,7 @@ static int __vb2_queue_alloc(struct vb2_queue *q, enum vb2_memory memory,
 			vb->planes[plane].min_length = plane_sizes[plane];
 		}
 
-		vb2_queue_add_buffer(q, vb, q_num_buffers + buffer);
+		vb2_queue_add_buffer(q, vb, index++);
 		call_void_bufop(q, init_buffer, vb);
 
 		/* Allocate video buffer memory for the MMAP type */
@@ -820,7 +825,7 @@ int vb2_core_reqbufs(struct vb2_queue *q, enum vb2_memory memory,
 	unsigned int q_num_bufs = vb2_get_num_buffers(q);
 	unsigned plane_sizes[VB2_MAX_PLANES] = { };
 	bool non_coherent_mem = flags & V4L2_MEMORY_FLAG_NON_COHERENT;
-	unsigned int i;
+	unsigned int i, first_index;
 	int ret = 0;
 
 	if (q->streaming) {
@@ -906,7 +911,7 @@ int vb2_core_reqbufs(struct vb2_queue *q, enum vb2_memory memory,
 
 	/* Finally, allocate buffers and video memory */
 	allocated_buffers =
-		__vb2_queue_alloc(q, memory, num_buffers, num_planes, plane_sizes);
+		__vb2_queue_alloc(q, memory, num_buffers, num_planes, plane_sizes, &first_index);
 	if (allocated_buffers == 0) {
 		dprintk(q, 1, "memory allocation failed\n");
 		ret = -ENOMEM;
@@ -980,7 +985,8 @@ EXPORT_SYMBOL_GPL(vb2_core_reqbufs);
 int vb2_core_create_bufs(struct vb2_queue *q, enum vb2_memory memory,
 			 unsigned int flags, unsigned int *count,
 			 unsigned int requested_planes,
-			 const unsigned int requested_sizes[])
+			 const unsigned int requested_sizes[],
+			 unsigned int *first_index)
 {
 	unsigned int num_planes = 0, num_buffers, allocated_buffers;
 	unsigned plane_sizes[VB2_MAX_PLANES] = { };
@@ -1042,7 +1048,7 @@ int vb2_core_create_bufs(struct vb2_queue *q, enum vb2_memory memory,
 
 	/* Finally, allocate buffers and video memory */
 	allocated_buffers = __vb2_queue_alloc(q, memory, num_buffers,
-				num_planes, plane_sizes);
+				num_planes, plane_sizes, first_index);
 	if (allocated_buffers == 0) {
 		dprintk(q, 1, "memory allocation failed\n");
 		ret = -ENOMEM;
diff --git a/drivers/media/common/videobuf2/videobuf2-v4l2.c b/drivers/media/common/videobuf2/videobuf2-v4l2.c
index 440c3b1c18ec..d50ba1fb7f05 100644
--- a/drivers/media/common/videobuf2/videobuf2-v4l2.c
+++ b/drivers/media/common/videobuf2/videobuf2-v4l2.c
@@ -799,11 +799,16 @@ int vb2_create_bufs(struct vb2_queue *q, struct v4l2_create_buffers *create)
 	for (i = 0; i < requested_planes; i++)
 		if (requested_sizes[i] == 0)
 			return -EINVAL;
-	return ret ? ret : vb2_core_create_bufs(q, create->memory,
-						create->flags,
-						&create->count,
-						requested_planes,
-						requested_sizes);
+	if (ret)
+		return ret;
+
+	ret = vb2_core_create_bufs(q, create->memory,
+				   create->flags,
+				   &create->count,
+				   requested_planes,
+				   requested_sizes,
+				   &create->index);
+	return ret;
 }
 EXPORT_SYMBOL_GPL(vb2_create_bufs);
 
@@ -1031,15 +1036,16 @@ int vb2_ioctl_create_bufs(struct file *file, void *priv,
 	int res = vb2_verify_memory_type(vdev->queue, p->memory,
 			p->format.type);
 
-	p->index = vdev->queue->num_buffers;
 	fill_buf_caps(vdev->queue, &p->capabilities);
 	validate_memory_flags(vdev->queue, p->memory, &p->flags);
 	/*
 	 * If count == 0, then just check if memory and type are valid.
 	 * Any -EBUSY result from vb2_verify_memory_type can be mapped to 0.
 	 */
-	if (p->count == 0)
+	if (p->count == 0) {
+		p->index = vb2_get_num_buffers(vdev->queue);
 		return res != -EBUSY ? res : 0;
+	}
 	if (res)
 		return res;
 	if (vb2_queue_is_busy(vdev->queue, file))
diff --git a/include/media/videobuf2-core.h b/include/media/videobuf2-core.h
index 5557d78b6f20..dbcdfcc4dc31 100644
--- a/include/media/videobuf2-core.h
+++ b/include/media/videobuf2-core.h
@@ -805,6 +805,8 @@ int vb2_core_reqbufs(struct vb2_queue *q, enum vb2_memory memory,
  * @count: requested buffer count.
  * @requested_planes: number of planes requested.
  * @requested_sizes: array with the size of the planes.
+ * @first_index: index of the first created buffer, all allocated buffers have
+ *		 indices in the range [first..first+count]
  *
  * Videobuf2 core helper to implement VIDIOC_CREATE_BUFS() operation. It is
  * called internally by VB2 by an API-specific handler, like
@@ -821,7 +823,8 @@ int vb2_core_reqbufs(struct vb2_queue *q, enum vb2_memory memory,
 int vb2_core_create_bufs(struct vb2_queue *q, enum vb2_memory memory,
 			 unsigned int flags, unsigned int *count,
 			 unsigned int requested_planes,
-			 const unsigned int requested_sizes[]);
+			 const unsigned int requested_sizes[],
+			 unsigned int *first_index);
 
 /**
  * vb2_core_prepare_buf() - Pass ownership of a buffer from userspace
-- 
2.39.2

[PATCH v15 52/56] media: core: Add bitmap manage bufs array entries

[Benjamin Gaignard]

Add a bitmap field to know which of bufs array entries are
used or not.
Remove no more used num_buffers field from queue structure.
Use bitmap_find_next_zero_area() to find the first possible
range when creating new buffers to fill the gaps.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>
---
 .../media/common/videobuf2/videobuf2-core.c   | 37 ++++++++++++++++---
 include/media/videobuf2-core.h                | 17 +++++----
 2 files changed, 41 insertions(+), 13 deletions(-)

diff --git a/drivers/media/common/videobuf2/videobuf2-core.c b/drivers/media/common/videobuf2/videobuf2-core.c
index 6379f8171405..df31cda323a2 100644
--- a/drivers/media/common/videobuf2/videobuf2-core.c
+++ b/drivers/media/common/videobuf2/videobuf2-core.c
@@ -421,11 +421,12 @@ static void init_buffer_cache_hints(struct vb2_queue *q, struct vb2_buffer *vb)
  */
 static void vb2_queue_add_buffer(struct vb2_queue *q, struct vb2_buffer *vb, unsigned int index)
 {
-	WARN_ON(index >= q->max_num_buffers || q->bufs[index] || vb->vb2_queue);
+	WARN_ON(index >= q->max_num_buffers || test_bit(index, q->bufs_bitmap) || vb->vb2_queue);
 
 	q->bufs[index] = vb;
 	vb->index = index;
 	vb->vb2_queue = q;
+	set_bit(index, q->bufs_bitmap);
 }
 
 /**
@@ -434,6 +435,7 @@ static void vb2_queue_add_buffer(struct vb2_queue *q, struct vb2_buffer *vb, uns
  */
 static void vb2_queue_remove_buffer(struct vb2_buffer *vb)
 {
+	clear_bit(vb->index, vb->vb2_queue->bufs_bitmap);
 	vb->vb2_queue->bufs[vb->index] = NULL;
 	vb->vb2_queue = NULL;
 }
@@ -462,7 +464,8 @@ static int __vb2_queue_alloc(struct vb2_queue *q, enum vb2_memory memory,
 	num_buffers = min_t(unsigned int, num_buffers,
 			    q->max_num_buffers - vb2_get_num_buffers(q));
 
-	index = vb2_get_num_buffers(q);
+	index = bitmap_find_next_zero_area(q->bufs_bitmap, q->max_num_buffers,
+					   0, num_buffers, 0);
 
 	*first_index = index;
 
@@ -664,7 +667,6 @@ static void __vb2_queue_free(struct vb2_queue *q, unsigned int buffers)
 		kfree(vb);
 	}
 
-	q->num_buffers -= buffers;
 	if (!vb2_get_num_buffers(q)) {
 		q->memory = VB2_MEMORY_UNKNOWN;
 		INIT_LIST_HEAD(&q->queued_list);
@@ -882,6 +884,14 @@ int vb2_core_reqbufs(struct vb2_queue *q, enum vb2_memory memory,
 		q->bufs = kcalloc(q->max_num_buffers, sizeof(*q->bufs), GFP_KERNEL);
 	if (!q->bufs)
 		ret = -ENOMEM;
+
+	if (!q->bufs_bitmap)
+		q->bufs_bitmap = bitmap_zalloc(q->max_num_buffers, GFP_KERNEL);
+	if (!q->bufs_bitmap) {
+		ret = -ENOMEM;
+		kfree(q->bufs);
+		q->bufs = NULL;
+	}
 	q->memory = memory;
 	mutex_unlock(&q->mmap_lock);
 	if (ret)
@@ -951,7 +961,6 @@ int vb2_core_reqbufs(struct vb2_queue *q, enum vb2_memory memory,
 	}
 
 	mutex_lock(&q->mmap_lock);
-	q->num_buffers = allocated_buffers;
 
 	if (ret < 0) {
 		/*
@@ -978,6 +987,10 @@ int vb2_core_reqbufs(struct vb2_queue *q, enum vb2_memory memory,
 	mutex_lock(&q->mmap_lock);
 	q->memory = VB2_MEMORY_UNKNOWN;
 	mutex_unlock(&q->mmap_lock);
+	kfree(q->bufs);
+	q->bufs = NULL;
+	bitmap_free(q->bufs_bitmap);
+	q->bufs_bitmap = NULL;
 	return ret;
 }
 EXPORT_SYMBOL_GPL(vb2_core_reqbufs);
@@ -1014,9 +1027,19 @@ int vb2_core_create_bufs(struct vb2_queue *q, enum vb2_memory memory,
 		q->memory = memory;
 		if (!q->bufs)
 			q->bufs = kcalloc(q->max_num_buffers, sizeof(*q->bufs), GFP_KERNEL);
-		if (!q->bufs)
+		if (!q->bufs) {
 			ret = -ENOMEM;
+			goto unlock;
+		}
+		if (!q->bufs_bitmap)
+			q->bufs_bitmap = bitmap_zalloc(q->max_num_buffers, GFP_KERNEL);
+		if (!q->bufs_bitmap) {
+			ret = -ENOMEM;
+			kfree(q->bufs);
+			q->bufs = NULL;
+		}
 		mutex_unlock(&q->mmap_lock);
+unlock:
 		if (ret)
 			return ret;
 		q->waiting_for_buffers = !q->is_output;
@@ -1078,7 +1101,6 @@ int vb2_core_create_bufs(struct vb2_queue *q, enum vb2_memory memory,
 	}
 
 	mutex_lock(&q->mmap_lock);
-	q->num_buffers += allocated_buffers;
 
 	if (ret < 0) {
 		/*
@@ -2561,6 +2583,9 @@ void vb2_core_queue_release(struct vb2_queue *q)
 	__vb2_queue_free(q, vb2_get_num_buffers(q));
 	kfree(q->bufs);
 	q->bufs = NULL;
+	bitmap_free(q->bufs_bitmap);
+	q->bufs_bitmap = NULL;
+
 	mutex_unlock(&q->mmap_lock);
 }
 EXPORT_SYMBOL_GPL(vb2_core_queue_release);
diff --git a/include/media/videobuf2-core.h b/include/media/videobuf2-core.h
index dbcdfcc4dc31..12e3dc4ca32c 100644
--- a/include/media/videobuf2-core.h
+++ b/include/media/videobuf2-core.h
@@ -346,8 +346,8 @@ struct vb2_buffer {
  *			describes the requested number of planes and sizes\[\]
  *			contains the requested plane sizes. In this case
  *			\*num_buffers are being allocated additionally to
- *			q->num_buffers. If either \*num_planes or the requested
- *			sizes are invalid callback must return %-EINVAL.
+ *			the buffers already in the queue. If either \*num_planes
+ *			or the requested sizes are invalid callback must return %-EINVAL.
  * @wait_prepare:	release any locks taken while calling vb2 functions;
  *			it is called before an ioctl needs to wait for a new
  *			buffer to arrive; required to avoid a deadlock in
@@ -557,7 +557,7 @@ struct vb2_buf_ops {
  * @memory:	current memory type used
  * @dma_dir:	DMA mapping direction.
  * @bufs:	videobuf2 buffer structures
- * @num_buffers: number of allocated/used buffers
+ * @bufs_bitmap: bitmap tracking whether each bufs[] entry is used
  * @max_num_buffers: upper limit of number of allocated/used buffers.
  *		     If set to 0 v4l2 core will change it VB2_MAX_FRAME
  *		     for backward compatibility.
@@ -623,7 +623,7 @@ struct vb2_queue {
 	unsigned int			memory;
 	enum dma_data_direction		dma_dir;
 	struct vb2_buffer		**bufs;
-	unsigned int			num_buffers;
+	unsigned long			*bufs_bitmap;
 	unsigned int			max_num_buffers;
 
 	struct list_head		queued_list;
@@ -1152,7 +1152,10 @@ static inline bool vb2_fileio_is_active(struct vb2_queue *q)
  */
 static inline unsigned int vb2_get_num_buffers(struct vb2_queue *q)
 {
-	return q->num_buffers;
+	if (!q->bufs_bitmap)
+		return 0;
+
+	return bitmap_weight(q->bufs_bitmap, q->max_num_buffers);
 }
 
 /**
@@ -1255,13 +1258,13 @@ static inline void vb2_clear_last_buffer_dequeued(struct vb2_queue *q)
 static inline struct vb2_buffer *vb2_get_buffer(struct vb2_queue *q,
 						unsigned int index)
 {
-	if (!q->bufs)
+	if (!q->bufs_bitmap)
 		return NULL;
 
 	if (index >= q->max_num_buffers)
 		return NULL;
 
-	if (index < q->num_buffers)
+	if (test_bit(index, q->bufs_bitmap))
 		return q->bufs[index];
 	return NULL;
 }
-- 
2.39.2

[PATCH v15 53/56] media: core: Free range of buffers

[Benjamin Gaignard]

Improve __vb2_queue_free() and __vb2_free_mem() to free
range of buffers and not only the last few buffers.
Intoduce starting index to be flexible on range and change the loops
according to this parameters.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>
---
 .../media/common/videobuf2/videobuf2-core.c   | 62 +++++++++----------
 1 file changed, 30 insertions(+), 32 deletions(-)

diff --git a/drivers/media/common/videobuf2/videobuf2-core.c b/drivers/media/common/videobuf2/videobuf2-core.c
index df31cda323a2..3fa923cbdba8 100644
--- a/drivers/media/common/videobuf2/videobuf2-core.c
+++ b/drivers/media/common/videobuf2/videobuf2-core.c
@@ -525,17 +525,16 @@ static int __vb2_queue_alloc(struct vb2_queue *q, enum vb2_memory memory,
 }
 
 /*
- * __vb2_free_mem() - release all video buffer memory for a given queue
+ * __vb2_free_mem() - release video buffer memory for a given range of
+ * buffers in a given queue
  */
-static void __vb2_free_mem(struct vb2_queue *q, unsigned int buffers)
+static void __vb2_free_mem(struct vb2_queue *q, unsigned int start, unsigned int count)
 {
-	unsigned int buffer;
+	unsigned int i;
 	struct vb2_buffer *vb;
-	unsigned int q_num_buffers = vb2_get_num_buffers(q);
 
-	for (buffer = q_num_buffers - buffers; buffer < q_num_buffers;
-	     ++buffer) {
-		vb = vb2_get_buffer(q, buffer);
+	for (i = start; i < q->max_num_buffers && i < start + count; i++) {
+		vb = vb2_get_buffer(q, i);
 		if (!vb)
 			continue;
 
@@ -550,35 +549,35 @@ static void __vb2_free_mem(struct vb2_queue *q, unsigned int buffers)
 }
 
 /*
- * __vb2_queue_free() - free buffers at the end of the queue - video memory and
+ * __vb2_queue_free() - free @count buffers from @start index of the queue - video memory and
  * related information, if no buffers are left return the queue to an
  * uninitialized state. Might be called even if the queue has already been freed.
  */
-static void __vb2_queue_free(struct vb2_queue *q, unsigned int buffers)
+static void __vb2_queue_free(struct vb2_queue *q, unsigned int start, unsigned int count)
 {
-	unsigned int buffer;
-	unsigned int q_num_buffers = vb2_get_num_buffers(q);
+	unsigned int i;
 
 	lockdep_assert_held(&q->mmap_lock);
 
 	/* Call driver-provided cleanup function for each buffer, if provided */
-	for (buffer = q_num_buffers - buffers; buffer < q_num_buffers;
-	     ++buffer) {
-		struct vb2_buffer *vb = vb2_get_buffer(q, buffer);
+	for (i = start; i < q->max_num_buffers && i < start + count; i++) {
+		struct vb2_buffer *vb = vb2_get_buffer(q, i);
 
-		if (vb && vb->planes[0].mem_priv)
+		if (!vb)
+			continue;
+		if (vb->planes[0].mem_priv)
 			call_void_vb_qop(vb, buf_cleanup, vb);
 	}
 
 	/* Release video buffer memory */
-	__vb2_free_mem(q, buffers);
+	__vb2_free_mem(q, start, count);
 
 #ifdef CONFIG_VIDEO_ADV_DEBUG
 	/*
 	 * Check that all the calls were balanced during the life-time of this
 	 * queue. If not then dump the counters to the kernel log.
 	 */
-	if (q_num_buffers) {
+	if (vb2_get_num_buffers(q)) {
 		bool unbalanced = q->cnt_start_streaming != q->cnt_stop_streaming ||
 				  q->cnt_prepare_streaming != q->cnt_unprepare_streaming ||
 				  q->cnt_wait_prepare != q->cnt_wait_finish;
@@ -604,8 +603,8 @@ static void __vb2_queue_free(struct vb2_queue *q, unsigned int buffers)
 		q->cnt_stop_streaming = 0;
 		q->cnt_unprepare_streaming = 0;
 	}
-	for (buffer = 0; buffer < vb2_get_num_buffers(q); buffer++) {
-		struct vb2_buffer *vb = vb2_get_buffer(q, buffer);
+	for (i = start; i < q->max_num_buffers && i < start + count; i++) {
+		struct vb2_buffer *vb = vb2_get_buffer(q, i);
 		bool unbalanced;
 
 		if (!vb)
@@ -622,7 +621,7 @@ static void __vb2_queue_free(struct vb2_queue *q, unsigned int buffers)
 
 		if (unbalanced) {
 			pr_info("unbalanced counters for queue %p, buffer %d:\n",
-				q, buffer);
+				q, i);
 			if (vb->cnt_buf_init != vb->cnt_buf_cleanup)
 				pr_info("     buf_init: %u buf_cleanup: %u\n",
 					vb->cnt_buf_init, vb->cnt_buf_cleanup);
@@ -656,9 +655,8 @@ static void __vb2_queue_free(struct vb2_queue *q, unsigned int buffers)
 #endif
 
 	/* Free vb2 buffers */
-	for (buffer = q_num_buffers - buffers; buffer < q_num_buffers;
-	     ++buffer) {
-		struct vb2_buffer *vb = vb2_get_buffer(q, buffer);
+	for (i = start; i < q->max_num_buffers && i < start + count; i++) {
+		struct vb2_buffer *vb = vb2_get_buffer(q, i);
 
 		if (!vb)
 			continue;
@@ -698,7 +696,7 @@ EXPORT_SYMBOL(vb2_buffer_in_use);
 static bool __buffers_in_use(struct vb2_queue *q)
 {
 	unsigned int buffer;
-	for (buffer = 0; buffer < vb2_get_num_buffers(q); ++buffer) {
+	for (buffer = 0; buffer < q->max_num_buffers; ++buffer) {
 		struct vb2_buffer *vb = vb2_get_buffer(q, buffer);
 
 		if (!vb)
@@ -858,7 +856,7 @@ int vb2_core_reqbufs(struct vb2_queue *q, enum vb2_memory memory,
 		 * queued without ever calling STREAMON.
 		 */
 		__vb2_queue_cancel(q);
-		__vb2_queue_free(q, q_num_bufs);
+		__vb2_queue_free(q, 0, q->max_num_buffers);
 		mutex_unlock(&q->mmap_lock);
 
 		/*
@@ -968,7 +966,7 @@ int vb2_core_reqbufs(struct vb2_queue *q, enum vb2_memory memory,
 		 * from already queued buffers and it will reset q->memory to
 		 * VB2_MEMORY_UNKNOWN.
 		 */
-		__vb2_queue_free(q, allocated_buffers);
+		__vb2_queue_free(q, first_index, allocated_buffers);
 		mutex_unlock(&q->mmap_lock);
 		return ret;
 	}
@@ -1008,7 +1006,7 @@ int vb2_core_create_bufs(struct vb2_queue *q, enum vb2_memory memory,
 	bool no_previous_buffers = !q_num_bufs;
 	int ret = 0;
 
-	if (q->num_buffers == q->max_num_buffers) {
+	if (q_num_bufs == q->max_num_buffers) {
 		dprintk(q, 1, "maximum number of buffers already allocated\n");
 		return -ENOBUFS;
 	}
@@ -1108,7 +1106,7 @@ int vb2_core_create_bufs(struct vb2_queue *q, enum vb2_memory memory,
 		 * from already queued buffers and it will reset q->memory to
 		 * VB2_MEMORY_UNKNOWN.
 		 */
-		__vb2_queue_free(q, allocated_buffers);
+		__vb2_queue_free(q, *first_index, allocated_buffers);
 		mutex_unlock(&q->mmap_lock);
 		return -ENOMEM;
 	}
@@ -1722,7 +1720,7 @@ static int vb2_start_streaming(struct vb2_queue *q)
 		 * Forcefully reclaim buffers if the driver did not
 		 * correctly return them to vb2.
 		 */
-		for (i = 0; i < vb2_get_num_buffers(q); ++i) {
+		for (i = 0; i < q->max_num_buffers; ++i) {
 			vb = vb2_get_buffer(q, i);
 
 			if (!vb)
@@ -2128,7 +2126,7 @@ static void __vb2_queue_cancel(struct vb2_queue *q)
 	 * to vb2 in stop_streaming().
 	 */
 	if (WARN_ON(atomic_read(&q->owned_by_drv_count))) {
-		for (i = 0; i < vb2_get_num_buffers(q); i++) {
+		for (i = 0; i < q->max_num_buffers; i++) {
 			struct vb2_buffer *vb = vb2_get_buffer(q, i);
 
 			if (!vb)
@@ -2172,7 +2170,7 @@ static void __vb2_queue_cancel(struct vb2_queue *q)
 	 * call to __fill_user_buffer() after buf_finish(). That order can't
 	 * be changed, so we can't move the buf_finish() to __vb2_dqbuf().
 	 */
-	for (i = 0; i < vb2_get_num_buffers(q); i++) {
+	for (i = 0; i < q->max_num_buffers; i++) {
 		struct vb2_buffer *vb;
 		struct media_request *req;
 
@@ -2580,7 +2578,7 @@ void vb2_core_queue_release(struct vb2_queue *q)
 	__vb2_cleanup_fileio(q);
 	__vb2_queue_cancel(q);
 	mutex_lock(&q->mmap_lock);
-	__vb2_queue_free(q, vb2_get_num_buffers(q));
+	__vb2_queue_free(q, 0, q->max_num_buffers);
 	kfree(q->bufs);
 	q->bufs = NULL;
 	bitmap_free(q->bufs_bitmap);
-- 
2.39.2

[PATCH v15 54/56] media: v4l2: Add DELETE_BUFS ioctl

[Benjamin Gaignard]

VIDIOC_DELETE_BUFS ioctl allows to delete buffers from a queue.
The number of buffers to delete in given by count field of
struct v4l2_delete_buffers and the range start at the index
specified in the same structure.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>
---
version 15:
- As suggested by Thomasz only test if count parameter == 0 in vb2_core_delete_bufs
  and update the documentation.

 .../userspace-api/media/v4l/user-func.rst     |  1 +
 .../media/v4l/vidioc-delete-bufs.rst          | 80 +++++++++++++++++++
 .../media/v4l/vidioc-reqbufs.rst              |  1 +
 .../media/common/videobuf2/videobuf2-core.c   | 30 +++++++
 .../media/common/videobuf2/videobuf2-v4l2.c   | 20 +++++
 drivers/media/v4l2-core/v4l2-dev.c            |  1 +
 drivers/media/v4l2-core/v4l2-ioctl.c          | 19 +++++
 include/media/v4l2-ioctl.h                    |  4 +
 include/media/videobuf2-core.h                | 12 +++
 include/media/videobuf2-v4l2.h                | 13 +++
 include/uapi/linux/videodev2.h                | 17 ++++
 11 files changed, 198 insertions(+)
 create mode 100644 Documentation/userspace-api/media/v4l/vidioc-delete-bufs.rst

diff --git a/Documentation/userspace-api/media/v4l/user-func.rst b/Documentation/userspace-api/media/v4l/user-func.rst
index 15ff0bf7bbe6..3fd567695477 100644
--- a/Documentation/userspace-api/media/v4l/user-func.rst
+++ b/Documentation/userspace-api/media/v4l/user-func.rst
@@ -17,6 +17,7 @@ Function Reference
     vidioc-dbg-g-chip-info
     vidioc-dbg-g-register
     vidioc-decoder-cmd
+    vidioc-delete-bufs
     vidioc-dqevent
     vidioc-dv-timings-cap
     vidioc-encoder-cmd
diff --git a/Documentation/userspace-api/media/v4l/vidioc-delete-bufs.rst b/Documentation/userspace-api/media/v4l/vidioc-delete-bufs.rst
new file mode 100644
index 000000000000..6e1f2eaa0626
--- /dev/null
+++ b/Documentation/userspace-api/media/v4l/vidioc-delete-bufs.rst
@@ -0,0 +1,80 @@
+.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
+.. c:namespace:: V4L
+
+.. _VIDIOC_DELETE_BUFS:
+
+************************
+ioctl VIDIOC_DELETE_BUFS
+************************
+
+Name
+====
+
+VIDIOC_DELETE_BUFS - Deletes buffers from a queue
+Drivers using this feature must expose the ``V4L2_BUF_CAP_SUPPORTS_DELETE_BUFS``
+capability on the queue :c:func:`VIDIOC_REQBUFS` or :c:func:`VIDIOC_CREATE_BUFS`
+are invoked.
+
+Synopsis
+========
+
+.. c:macro:: VIDIOC_DELETE_BUFs
+
+``int ioctl(int fd, VIDIOC_DELETE_BUFs, struct v4l2_delete_buffers *argp)``
+
+Arguments
+=========
+
+``fd``
+    File descriptor returned by :c:func:`open()`.
+
+``argp``
+    Pointer to struct :c:type:`v4l2_delete_buffers`.
+
+Description
+===========
+
+Applications can optionally call the :ref:`VIDIOC_DELETE_BUFS` ioctl to
+delete buffers from a queue.
+
+.. c:type:: v4l2_delete_buffers
+
+.. tabularcolumns:: |p{4.4cm}|p{4.4cm}|p{8.5cm}|
+
+.. flat-table:: struct v4l2_delete_buffers
+    :header-rows:  0
+    :stub-columns: 0
+    :widths:       1 1 2
+
+    * - __u32
+      - ``index``
+      - The starting buffer index to delete.
+    * - __u32
+      - ``count``
+      - The number of buffers to be deleted with indices 'index' until 'index + count - 1'.
+        All buffers in this range must be valid and in DEQUEUED state.
+        In error case errno is set to ``EINVAL`` error code and index returns the index of
+        the invalid buffer.
+        If count is set to 0 :ref:`VIDIOC_DELETE_BUFS` will return 0.
+    * - __u32
+      - ``type``
+      - Type of the stream or buffers, this is the same as the struct
+	:c:type:`v4l2_format` ``type`` field. See
+	:c:type:`v4l2_buf_type` for valid values.
+    * - __u32
+      - ``reserved``\ [13]
+      - A place holder for future extensions. Drivers and applications
+	must set the array to zero.
+
+Return Value
+============
+
+On success 0 is returned, on error -1 and the ``errno`` variable is set
+appropriately. The generic error codes are described at the
+:ref:`Generic Error Codes <gen-errors>` chapter.
+
+EBUSY
+    File I/O is in progress.
+
+EINVAL
+    The buffer ``index`` doesn't exist in the queue.
diff --git a/Documentation/userspace-api/media/v4l/vidioc-reqbufs.rst b/Documentation/userspace-api/media/v4l/vidioc-reqbufs.rst
index 0b3a41a45d05..14d4a49c2945 100644
--- a/Documentation/userspace-api/media/v4l/vidioc-reqbufs.rst
+++ b/Documentation/userspace-api/media/v4l/vidioc-reqbufs.rst
@@ -121,6 +121,7 @@ aborting or finishing any DMA in progress, an implicit
 .. _V4L2-BUF-CAP-SUPPORTS-M2M-HOLD-CAPTURE-BUF:
 .. _V4L2-BUF-CAP-SUPPORTS-MMAP-CACHE-HINTS:
 .. _V4L2-BUF-CAP-SUPPORTS-MAX-NUM-BUFFERS:
+.. _V4L2-BUF-CAP-SUPPORTS-DELETE-BUFS:
 
 .. raw:: latex
 
diff --git a/drivers/media/common/videobuf2/videobuf2-core.c b/drivers/media/common/videobuf2/videobuf2-core.c
index 3fa923cbdba8..f20e81eb467a 100644
--- a/drivers/media/common/videobuf2/videobuf2-core.c
+++ b/drivers/media/common/videobuf2/videobuf2-core.c
@@ -1674,6 +1674,36 @@ int vb2_core_prepare_buf(struct vb2_queue *q, struct vb2_buffer *vb, void *pb)
 }
 EXPORT_SYMBOL_GPL(vb2_core_prepare_buf);
 
+int vb2_core_delete_bufs(struct vb2_queue *q, unsigned int start, unsigned int count)
+{
+	unsigned int i, ret = 0;
+
+	if (count == 0)
+		return 0;
+
+	mutex_lock(&q->mmap_lock);
+
+	for (i = start; i < start + count && i < q->max_num_buffers; i++) {
+		struct vb2_buffer *vb = vb2_get_buffer(q, i);
+
+		if (!vb) {
+			ret = -EINVAL;
+			goto unlock;
+		}
+		if (vb->state != VB2_BUF_STATE_DEQUEUED) {
+			ret = -EINVAL;
+			goto unlock;
+		}
+	}
+	__vb2_queue_free(q, start, count);
+	dprintk(q, 2, "buffers deleted\n");
+
+unlock:
+	mutex_unlock(&q->mmap_lock);
+	return ret;
+}
+EXPORT_SYMBOL_GPL(vb2_core_delete_bufs);
+
 /*
  * vb2_start_streaming() - Attempt to start streaming.
  * @q:		videobuf2 queue
diff --git a/drivers/media/common/videobuf2/videobuf2-v4l2.c b/drivers/media/common/videobuf2/videobuf2-v4l2.c
index d50ba1fb7f05..60eb0250bcce 100644
--- a/drivers/media/common/videobuf2/videobuf2-v4l2.c
+++ b/drivers/media/common/videobuf2/videobuf2-v4l2.c
@@ -688,6 +688,8 @@ static void fill_buf_caps(struct vb2_queue *q, u32 *caps)
 	if (q->supports_requests)
 		*caps |= V4L2_BUF_CAP_SUPPORTS_REQUESTS;
 #endif
+	if (q->supports_delete_bufs)
+		*caps |= V4L2_BUF_CAP_SUPPORTS_DELETE_BUFS;
 }
 
 static void validate_memory_flags(struct vb2_queue *q,
@@ -745,6 +747,12 @@ int vb2_prepare_buf(struct vb2_queue *q, struct media_device *mdev,
 }
 EXPORT_SYMBOL_GPL(vb2_prepare_buf);
 
+int vb2_delete_bufs(struct vb2_queue *q, struct v4l2_delete_buffers *d)
+{
+	return vb2_core_delete_bufs(q, d->index, d->count);
+}
+EXPORT_SYMBOL_GPL(vb2_delete_bufs);
+
 int vb2_create_bufs(struct vb2_queue *q, struct v4l2_create_buffers *create)
 {
 	unsigned requested_planes = 1;
@@ -1006,6 +1014,18 @@ EXPORT_SYMBOL_GPL(vb2_poll);
 
 /* vb2 ioctl helpers */
 
+int vb2_ioctl_delete_bufs(struct file *file, void *priv,
+			  struct v4l2_delete_buffers *p)
+{
+	struct video_device *vdev = video_devdata(file);
+
+	if (vb2_queue_is_busy(vdev->queue, file))
+		return -EBUSY;
+
+	return vb2_delete_bufs(vdev->queue, p);
+}
+EXPORT_SYMBOL_GPL(vb2_ioctl_delete_bufs);
+
 int vb2_ioctl_reqbufs(struct file *file, void *priv,
 			  struct v4l2_requestbuffers *p)
 {
diff --git a/drivers/media/v4l2-core/v4l2-dev.c b/drivers/media/v4l2-core/v4l2-dev.c
index f81279492682..215654fd6581 100644
--- a/drivers/media/v4l2-core/v4l2-dev.c
+++ b/drivers/media/v4l2-core/v4l2-dev.c
@@ -720,6 +720,7 @@ static void determine_valid_ioctls(struct video_device *vdev)
 		SET_VALID_IOCTL(ops, VIDIOC_PREPARE_BUF, vidioc_prepare_buf);
 		SET_VALID_IOCTL(ops, VIDIOC_STREAMON, vidioc_streamon);
 		SET_VALID_IOCTL(ops, VIDIOC_STREAMOFF, vidioc_streamoff);
+		SET_VALID_IOCTL(ops, VIDIOC_DELETE_BUFS, vidioc_delete_bufs);
 	}
 
 	if (is_vid || is_vbi || is_meta) {
diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c
index 4d90424cbfc4..491745832266 100644
--- a/drivers/media/v4l2-core/v4l2-ioctl.c
+++ b/drivers/media/v4l2-core/v4l2-ioctl.c
@@ -489,6 +489,13 @@ static void v4l_print_create_buffers(const void *arg, bool write_only)
 	v4l_print_format(&p->format, write_only);
 }
 
+static void v4l_print_delete_buffers(const void *arg, bool write_only)
+{
+	const struct v4l2_delete_buffers *p = arg;
+
+	pr_cont("index=%u, count=%u\n", p->index, p->count);
+}
+
 static void v4l_print_streamparm(const void *arg, bool write_only)
 {
 	const struct v4l2_streamparm *p = arg;
@@ -2161,6 +2168,17 @@ static int v4l_prepare_buf(const struct v4l2_ioctl_ops *ops,
 	return ret ? ret : ops->vidioc_prepare_buf(file, fh, b);
 }
 
+static int v4l_delete_bufs(const struct v4l2_ioctl_ops *ops,
+			   struct file *file, void *fh, void *arg)
+{
+	struct v4l2_delete_buffers *delete = arg;
+	int ret = check_fmt(file, delete->type);
+
+	memset_after(delete, 0, type);
+
+	return ret ? ret : ops->vidioc_delete_bufs(file, fh, delete);
+}
+
 static int v4l_g_parm(const struct v4l2_ioctl_ops *ops,
 				struct file *file, void *fh, void *arg)
 {
@@ -2910,6 +2928,7 @@ static const struct v4l2_ioctl_info v4l2_ioctls[] = {
 	IOCTL_INFO(VIDIOC_ENUM_FREQ_BANDS, v4l_enum_freq_bands, v4l_print_freq_band, 0),
 	IOCTL_INFO(VIDIOC_DBG_G_CHIP_INFO, v4l_dbg_g_chip_info, v4l_print_dbg_chip_info, INFO_FL_CLEAR(v4l2_dbg_chip_info, match)),
 	IOCTL_INFO(VIDIOC_QUERY_EXT_CTRL, v4l_query_ext_ctrl, v4l_print_query_ext_ctrl, INFO_FL_CTRL | INFO_FL_CLEAR(v4l2_query_ext_ctrl, id)),
+	IOCTL_INFO(VIDIOC_DELETE_BUFS, v4l_delete_bufs, v4l_print_delete_buffers, INFO_FL_PRIO | INFO_FL_QUEUE | INFO_FL_CLEAR(v4l2_delete_buffers, type)),
 };
 #define V4L2_IOCTLS ARRAY_SIZE(v4l2_ioctls)
 
diff --git a/include/media/v4l2-ioctl.h b/include/media/v4l2-ioctl.h
index edb733f21604..55afbde54211 100644
--- a/include/media/v4l2-ioctl.h
+++ b/include/media/v4l2-ioctl.h
@@ -163,6 +163,8 @@ struct v4l2_fh;
  *	:ref:`VIDIOC_CREATE_BUFS <vidioc_create_bufs>` ioctl
  * @vidioc_prepare_buf: pointer to the function that implements
  *	:ref:`VIDIOC_PREPARE_BUF <vidioc_prepare_buf>` ioctl
+ * @vidioc_delete_bufs: pointer to the function that implements
+ *	:ref:`VIDIOC_DELETE_BUFS <vidioc_delete_bufs>` ioctl
  * @vidioc_overlay: pointer to the function that implements
  *	:ref:`VIDIOC_OVERLAY <vidioc_overlay>` ioctl
  * @vidioc_g_fbuf: pointer to the function that implements
@@ -422,6 +424,8 @@ struct v4l2_ioctl_ops {
 				  struct v4l2_create_buffers *b);
 	int (*vidioc_prepare_buf)(struct file *file, void *fh,
 				  struct v4l2_buffer *b);
+	int (*vidioc_delete_bufs)(struct file *file, void *fh,
+				  struct v4l2_delete_buffers *d);
 
 	int (*vidioc_overlay)(struct file *file, void *fh, unsigned int i);
 	int (*vidioc_g_fbuf)(struct file *file, void *fh,
diff --git a/include/media/videobuf2-core.h b/include/media/videobuf2-core.h
index 12e3dc4ca32c..0235eed03fce 100644
--- a/include/media/videobuf2-core.h
+++ b/include/media/videobuf2-core.h
@@ -507,6 +507,7 @@ struct vb2_buf_ops {
  * @supports_requests: this queue supports the Request API.
  * @requires_requests: this queue requires the Request API. If this is set to 1,
  *		then supports_requests must be set to 1 as well.
+ * @supports_delete_bufs: this queue supports DELETE_BUFS ioctl.
  * @uses_qbuf:	qbuf was used directly for this queue. Set to 1 the first
  *		time this is called. Set to 0 when the queue is canceled.
  *		If this is 1, then you cannot queue buffers from a request.
@@ -597,6 +598,7 @@ struct vb2_queue {
 	unsigned int		   quirk_poll_must_check_waiting_for_buffers:1;
 	unsigned int			supports_requests:1;
 	unsigned int			requires_requests:1;
+	unsigned int			supports_delete_bufs:1;
 	unsigned int			uses_qbuf:1;
 	unsigned int			uses_requests:1;
 	unsigned int			allow_cache_hints:1;
@@ -848,6 +850,16 @@ int vb2_core_create_bufs(struct vb2_queue *q, enum vb2_memory memory,
  */
 int vb2_core_prepare_buf(struct vb2_queue *q, struct vb2_buffer *vb, void *pb);
 
+/**
+ * vb2_core_delete_bufs() -
+ * @q:		pointer to &struct vb2_queue with videobuf2 queue.
+ * @start:	first index of the range of buffers to delete.
+ * @count:	number of buffers to delete.
+ *
+ *  Return: returns zero on success; an error code otherwise.
+ */
+int vb2_core_delete_bufs(struct vb2_queue *q, unsigned int start, unsigned int count);
+
 /**
  * vb2_core_qbuf() - Queue a buffer from userspace
  *
diff --git a/include/media/videobuf2-v4l2.h b/include/media/videobuf2-v4l2.h
index 5a845887850b..79cea8459f52 100644
--- a/include/media/videobuf2-v4l2.h
+++ b/include/media/videobuf2-v4l2.h
@@ -118,6 +118,17 @@ int vb2_create_bufs(struct vb2_queue *q, struct v4l2_create_buffers *create);
  */
 int vb2_prepare_buf(struct vb2_queue *q, struct media_device *mdev,
 		    struct v4l2_buffer *b);
+/**
+ * vb2_delete_bufs() - Delete buffers from the queue
+ *
+ * @q:		pointer to &struct vb2_queue with videobuf2 queue.
+ * @d:		delete parameter, passed from userspace to
+ *		&v4l2_ioctl_ops->vidioc_delete_bufs handler in driver
+ *
+ * The return values from this function are intended to be directly returned
+ * from &v4l2_ioctl_ops->vidioc_delete_bufs handler in driver.
+ */
+int vb2_delete_bufs(struct vb2_queue *q, struct v4l2_delete_buffers *d);
 
 /**
  * vb2_qbuf() - Queue a buffer from userspace
@@ -334,6 +345,8 @@ int vb2_ioctl_streamon(struct file *file, void *priv, enum v4l2_buf_type i);
 int vb2_ioctl_streamoff(struct file *file, void *priv, enum v4l2_buf_type i);
 int vb2_ioctl_expbuf(struct file *file, void *priv,
 	struct v4l2_exportbuffer *p);
+int vb2_ioctl_delete_bufs(struct file *file, void *priv,
+			  struct v4l2_delete_buffers *p);
 
 /* struct v4l2_file_operations helpers */
 
diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
index 13ddb5abf584..96e105149906 100644
--- a/include/uapi/linux/videodev2.h
+++ b/include/uapi/linux/videodev2.h
@@ -1036,6 +1036,7 @@ struct v4l2_requestbuffers {
 #define V4L2_BUF_CAP_SUPPORTS_M2M_HOLD_CAPTURE_BUF	(1 << 5)
 #define V4L2_BUF_CAP_SUPPORTS_MMAP_CACHE_HINTS		(1 << 6)
 #define V4L2_BUF_CAP_SUPPORTS_MAX_NUM_BUFFERS		(1 << 7)
+#define V4L2_BUF_CAP_SUPPORTS_DELETE_BUFS		(1 << 8)
 
 /**
  * struct v4l2_plane - plane info for multi-planar buffers
@@ -2622,6 +2623,20 @@ struct v4l2_create_buffers {
 	__u32			reserved[5];
 };
 
+/**
+ * struct v4l2_delete_buffers - VIDIOC_DELETE_BUFS argument
+ * @index:	the first buffer to be deleted
+ * @count:	number of buffers to delete
+ * @type:	enum v4l2_buf_type
+ * @reserved:	future extensions
+ */
+struct v4l2_delete_buffers {
+	__u32			index;
+	__u32			count;
+	__u32			type;
+	__u32			reserved[13];
+};
+
 /*
  *	I O C T L   C O D E S   F O R   V I D E O   D E V I C E S
  *
@@ -2721,6 +2736,8 @@ struct v4l2_create_buffers {
 #define VIDIOC_DBG_G_CHIP_INFO  _IOWR('V', 102, struct v4l2_dbg_chip_info)
 
 #define VIDIOC_QUERY_EXT_CTRL	_IOWR('V', 103, struct v4l2_query_ext_ctrl)
+#define VIDIOC_DELETE_BUFS	_IOWR('V', 104, struct v4l2_delete_buffers)
+
 
 /* Reminder: when adding new ioctls please add support for them to
    drivers/media/v4l2-core/v4l2-compat-ioctl32.c as well! */
-- 
2.39.2

[PATCH v15 55/56] media: v4l2: Add mem2mem helpers for DELETE_BUFS ioctl

[Benjamin Gaignard]

Create v4l2-mem2mem helpers for VIDIOC_DELETE_BUFS ioctl.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>
---
 .../media/platform/verisilicon/hantro_drv.c   |  1 +
 .../media/platform/verisilicon/hantro_v4l2.c  |  1 +
 drivers/media/test-drivers/vim2m.c            |  2 ++
 drivers/media/v4l2-core/v4l2-mem2mem.c        | 20 +++++++++++++++++++
 include/media/v4l2-mem2mem.h                  | 12 +++++++++++
 5 files changed, 36 insertions(+)

diff --git a/drivers/media/platform/verisilicon/hantro_drv.c b/drivers/media/platform/verisilicon/hantro_drv.c
index 7f5b82eb6649..c8fed313c36f 100644
--- a/drivers/media/platform/verisilicon/hantro_drv.c
+++ b/drivers/media/platform/verisilicon/hantro_drv.c
@@ -248,6 +248,7 @@ queue_init(void *priv, struct vb2_queue *src_vq, struct vb2_queue *dst_vq)
 	dst_vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY;
 	dst_vq->lock = &ctx->dev->vpu_mutex;
 	dst_vq->dev = ctx->dev->v4l2_dev.dev;
+	src_vq->supports_delete_bufs = true;
 
 	return vb2_queue_init(dst_vq);
 }
diff --git a/drivers/media/platform/verisilicon/hantro_v4l2.c b/drivers/media/platform/verisilicon/hantro_v4l2.c
index 27a1e77cca38..0fd1c2fc78c8 100644
--- a/drivers/media/platform/verisilicon/hantro_v4l2.c
+++ b/drivers/media/platform/verisilicon/hantro_v4l2.c
@@ -756,6 +756,7 @@ const struct v4l2_ioctl_ops hantro_ioctl_ops = {
 	.vidioc_dqbuf = v4l2_m2m_ioctl_dqbuf,
 	.vidioc_prepare_buf = v4l2_m2m_ioctl_prepare_buf,
 	.vidioc_create_bufs = v4l2_m2m_ioctl_create_bufs,
+	.vidioc_delete_bufs = v4l2_m2m_ioctl_delete_bufs,
 	.vidioc_expbuf = v4l2_m2m_ioctl_expbuf,
 
 	.vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
diff --git a/drivers/media/test-drivers/vim2m.c b/drivers/media/test-drivers/vim2m.c
index 3e3b424b4860..17213ce42059 100644
--- a/drivers/media/test-drivers/vim2m.c
+++ b/drivers/media/test-drivers/vim2m.c
@@ -960,6 +960,7 @@ static const struct v4l2_ioctl_ops vim2m_ioctl_ops = {
 	.vidioc_dqbuf		= v4l2_m2m_ioctl_dqbuf,
 	.vidioc_prepare_buf	= v4l2_m2m_ioctl_prepare_buf,
 	.vidioc_create_bufs	= v4l2_m2m_ioctl_create_bufs,
+	.vidioc_delete_bufs	= v4l2_m2m_ioctl_delete_bufs,
 	.vidioc_expbuf		= v4l2_m2m_ioctl_expbuf,
 
 	.vidioc_streamon	= v4l2_m2m_ioctl_streamon,
@@ -1133,6 +1134,7 @@ static int queue_init(void *priv, struct vb2_queue *src_vq,
 	dst_vq->mem_ops = &vb2_vmalloc_memops;
 	dst_vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY;
 	dst_vq->lock = &ctx->vb_mutex;
+	dst_vq->supports_delete_bufs = true;
 
 	return vb2_queue_init(dst_vq);
 }
diff --git a/drivers/media/v4l2-core/v4l2-mem2mem.c b/drivers/media/v4l2-core/v4l2-mem2mem.c
index 0cc30397fbad..d1d59943680f 100644
--- a/drivers/media/v4l2-core/v4l2-mem2mem.c
+++ b/drivers/media/v4l2-core/v4l2-mem2mem.c
@@ -831,6 +831,17 @@ int v4l2_m2m_prepare_buf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
 }
 EXPORT_SYMBOL_GPL(v4l2_m2m_prepare_buf);
 
+int v4l2_m2m_delete_bufs(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
+			 struct v4l2_delete_buffers *d)
+{
+	struct vb2_queue *vq;
+
+	vq = v4l2_m2m_get_vq(m2m_ctx, d->type);
+
+	return vb2_delete_bufs(vq, d);
+}
+EXPORT_SYMBOL_GPL(v4l2_m2m_delete_bufs);
+
 int v4l2_m2m_create_bufs(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
 			 struct v4l2_create_buffers *create)
 {
@@ -1377,6 +1388,15 @@ int v4l2_m2m_ioctl_create_bufs(struct file *file, void *priv,
 }
 EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_create_bufs);
 
+int v4l2_m2m_ioctl_delete_bufs(struct file *file, void *priv,
+			       struct v4l2_delete_buffers *d)
+{
+	struct v4l2_fh *fh = file->private_data;
+
+	return v4l2_m2m_delete_bufs(file, fh->m2m_ctx, d);
+}
+EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_delete_bufs);
+
 int v4l2_m2m_ioctl_querybuf(struct file *file, void *priv,
 				struct v4l2_buffer *buf)
 {
diff --git a/include/media/v4l2-mem2mem.h b/include/media/v4l2-mem2mem.h
index d6c8eb2b5201..161f85c42dc8 100644
--- a/include/media/v4l2-mem2mem.h
+++ b/include/media/v4l2-mem2mem.h
@@ -381,6 +381,16 @@ int v4l2_m2m_dqbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
 int v4l2_m2m_prepare_buf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
 			 struct v4l2_buffer *buf);
 
+/**
+ * v4l2_m2m_delete_bufs() - delete buffers from the queue
+ *
+ * @file: pointer to struct &file
+ * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
+ * @d: pointer to struct &v4l2_delete_buffers
+ */
+int v4l2_m2m_delete_bufs(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
+			 struct v4l2_delete_buffers *d);
+
 /**
  * v4l2_m2m_create_bufs() - create a source or destination buffer, depending
  * on the type
@@ -860,6 +870,8 @@ int v4l2_m2m_ioctl_reqbufs(struct file *file, void *priv,
 				struct v4l2_requestbuffers *rb);
 int v4l2_m2m_ioctl_create_bufs(struct file *file, void *fh,
 				struct v4l2_create_buffers *create);
+int v4l2_m2m_ioctl_delete_bufs(struct file *file, void *priv,
+			       struct v4l2_delete_buffers *d);
 int v4l2_m2m_ioctl_querybuf(struct file *file, void *fh,
 				struct v4l2_buffer *buf);
 int v4l2_m2m_ioctl_expbuf(struct file *file, void *fh,
-- 
2.39.2

[PATCH v15 56/56] media: test-drivers: Use helper for DELETE_BUFS ioctl

[Benjamin Gaignard]

Allow test drivers to use DELETE_BUFS by adding vb2_ioctl_delete_bufs() helper.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>
---
 drivers/media/test-drivers/vicodec/vicodec-core.c |  2 ++
 drivers/media/test-drivers/vimc/vimc-capture.c    |  2 ++
 drivers/media/test-drivers/visl/visl-video.c      |  2 ++
 drivers/media/test-drivers/vivid/vivid-core.c     | 13 ++++++++++---
 4 files changed, 16 insertions(+), 3 deletions(-)

diff --git a/drivers/media/test-drivers/vicodec/vicodec-core.c b/drivers/media/test-drivers/vicodec/vicodec-core.c
index 69cbe2c094e1..f14a8fd506d0 100644
--- a/drivers/media/test-drivers/vicodec/vicodec-core.c
+++ b/drivers/media/test-drivers/vicodec/vicodec-core.c
@@ -1339,6 +1339,7 @@ static const struct v4l2_ioctl_ops vicodec_ioctl_ops = {
 	.vidioc_prepare_buf	= v4l2_m2m_ioctl_prepare_buf,
 	.vidioc_create_bufs	= v4l2_m2m_ioctl_create_bufs,
 	.vidioc_expbuf		= v4l2_m2m_ioctl_expbuf,
+	.vidioc_delete_bufs	= v4l2_m2m_ioctl_delete_bufs,
 
 	.vidioc_streamon	= v4l2_m2m_ioctl_streamon,
 	.vidioc_streamoff	= v4l2_m2m_ioctl_streamoff,
@@ -1725,6 +1726,7 @@ static int queue_init(void *priv, struct vb2_queue *src_vq,
 	dst_vq->mem_ops = &vb2_vmalloc_memops;
 	dst_vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY;
 	dst_vq->lock = src_vq->lock;
+	dst_vq->supports_delete_bufs = true;
 
 	return vb2_queue_init(dst_vq);
 }
diff --git a/drivers/media/test-drivers/vimc/vimc-capture.c b/drivers/media/test-drivers/vimc/vimc-capture.c
index aa944270e716..fda7ea3a6cb6 100644
--- a/drivers/media/test-drivers/vimc/vimc-capture.c
+++ b/drivers/media/test-drivers/vimc/vimc-capture.c
@@ -221,6 +221,7 @@ static const struct v4l2_ioctl_ops vimc_capture_ioctl_ops = {
 	.vidioc_expbuf = vb2_ioctl_expbuf,
 	.vidioc_streamon = vb2_ioctl_streamon,
 	.vidioc_streamoff = vb2_ioctl_streamoff,
+	.vidioc_delete_bufs = vb2_ioctl_delete_bufs,
 };
 
 static void vimc_capture_return_all_buffers(struct vimc_capture_device *vcapture,
@@ -435,6 +436,7 @@ static struct vimc_ent_device *vimc_capture_add(struct vimc_device *vimc,
 	q->min_buffers_needed = 2;
 	q->lock = &vcapture->lock;
 	q->dev = v4l2_dev->dev;
+	q->supports_delete_bufs = true;
 
 	ret = vb2_queue_init(q);
 	if (ret) {
diff --git a/drivers/media/test-drivers/visl/visl-video.c b/drivers/media/test-drivers/visl/visl-video.c
index 7cac6a6456eb..bd6c112f7846 100644
--- a/drivers/media/test-drivers/visl/visl-video.c
+++ b/drivers/media/test-drivers/visl/visl-video.c
@@ -521,6 +521,7 @@ const struct v4l2_ioctl_ops visl_ioctl_ops = {
 	.vidioc_prepare_buf		= v4l2_m2m_ioctl_prepare_buf,
 	.vidioc_create_bufs		= v4l2_m2m_ioctl_create_bufs,
 	.vidioc_expbuf			= v4l2_m2m_ioctl_expbuf,
+	.vidioc_delete_bufs		= v4l2_m2m_ioctl_delete_bufs,
 
 	.vidioc_streamon		= v4l2_m2m_ioctl_streamon,
 	.vidioc_streamoff		= v4l2_m2m_ioctl_streamoff,
@@ -728,6 +729,7 @@ int visl_queue_init(void *priv, struct vb2_queue *src_vq,
 	dst_vq->mem_ops = &vb2_vmalloc_memops;
 	dst_vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY;
 	dst_vq->lock = &ctx->vb_mutex;
+	dst_vq->supports_delete_bufs = true;
 
 	return vb2_queue_init(dst_vq);
 }
diff --git a/drivers/media/test-drivers/vivid/vivid-core.c b/drivers/media/test-drivers/vivid/vivid-core.c
index 353f035fcd19..06b18d8e2248 100644
--- a/drivers/media/test-drivers/vivid/vivid-core.c
+++ b/drivers/media/test-drivers/vivid/vivid-core.c
@@ -769,6 +769,7 @@ static const struct v4l2_ioctl_ops vivid_ioctl_ops = {
 	.vidioc_expbuf			= vb2_ioctl_expbuf,
 	.vidioc_streamon		= vb2_ioctl_streamon,
 	.vidioc_streamoff		= vb2_ioctl_streamoff,
+	.vidioc_delete_bufs		= vb2_ioctl_delete_bufs,
 
 	.vidioc_enum_input		= vivid_enum_input,
 	.vidioc_g_input			= vivid_g_input,
@@ -883,12 +884,18 @@ static int vivid_create_queue(struct vivid_dev *dev,
 	 * PAGE_SHIFT > 12, but then max_num_buffers will be clamped by
 	 * videobuf2-core.c to MAX_BUFFER_INDEX.
 	 */
-	if (buf_type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
+	if (buf_type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
 		q->max_num_buffers = 64;
-	if (buf_type == V4L2_BUF_TYPE_SDR_CAPTURE)
+		q->supports_delete_bufs = true;
+	}
+	if (buf_type == V4L2_BUF_TYPE_SDR_CAPTURE) {
 		q->max_num_buffers = 1024;
-	if (buf_type == V4L2_BUF_TYPE_VBI_CAPTURE)
+		q->supports_delete_bufs = true;
+	}
+	if (buf_type == V4L2_BUF_TYPE_VBI_CAPTURE) {
 		q->max_num_buffers = 32768;
+		q->supports_delete_bufs = true;
+	}
 
 	if (allocators[dev->inst] != 1)
 		q->io_modes |= VB2_USERPTR;
-- 
2.39.2