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SubjectRe: [PATCH v6 4/8] media: platform: Add Cedrus VPU decoder driver
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Hi Hans and thanks for the review!

On Sat, 2018-08-04 at 14:18 +0200, Hans Verkuil wrote:
> Hi Paul,
>
> See below for my review comments. Mostly small fry, the main issue I found is
> that there is no support for VIDIOC_DECODER_CMD. That's the proper way of
> stopping a decoder. Don't rely on the deprecated allow_zero_bytesused field.

Mhh, it looks like this was kept around by negligence, but we do expect
that streamoff stops the decoder, not a zero bytesused field.

Is it still required to implement the V4L2_DEC_CMD_STOP
VIDIOC_DECODER_CMD in that case? I read in the doc that this ioctl
should be optional.

[...]

> > +static int cedrus_request_validate(struct media_request *req)
> > +{
> > + struct media_request_object *obj, *obj_safe;
> > + struct v4l2_ctrl_handler *parent_hdl, *hdl;
> > + struct cedrus_ctx *ctx = NULL;
> > + struct v4l2_ctrl *ctrl_test;
> > + unsigned int i;
> > +
> > + list_for_each_entry_safe(obj, obj_safe, &req->objects, list) {
> > + struct vb2_buffer *vb;
> > +
> > + if (vb2_request_object_is_buffer(obj)) {
> > + vb = container_of(obj, struct vb2_buffer, req_obj);
> > + ctx = vb2_get_drv_priv(vb->vb2_queue);
> > +
> > + break;
> > + }
> > + }
> > +
> > + if (!ctx)
> > + return -EINVAL;
>
> Return -ENOENT, just as vb2_request_validate does.

Thanks, will fix this and the following errors in the next revision.
> > +
> > + parent_hdl = &ctx->hdl;
> > +
> > + hdl = v4l2_ctrl_request_hdl_find(req, parent_hdl);
> > + if (!hdl) {
> > + v4l2_err(&ctx->dev->v4l2_dev, "Missing codec control(s)\n");
> > + return -EINVAL;
>
> Ditto, return -ENOENT.
>
> > + }
> > +
> > + for (i = 0; i < CEDRUS_CONTROLS_COUNT; i++) {
> > + if (cedrus_controls[i].codec != ctx->current_codec ||
> > + !cedrus_controls[i].required)
> > + continue;
> > +
> > + ctrl_test = v4l2_ctrl_request_hdl_ctrl_find(hdl,
> > + cedrus_controls[i].id);
> > + if (!ctrl_test) {
> > + v4l2_err(&ctx->dev->v4l2_dev,
> > + "Missing required codec control\n");
> > + return -EINVAL;
>
> Ditto.
>
> The documentation of MEDIA_REQUEST_IOC_QUEUE says this for ENOENT:
>
> ENOENT
> The request did not contain any buffers. All requests are required
> to have at least one buffer. This can also be returned if required
> controls are missing.
>
> So ENOENT is the correct error code when checking for required controls.

Thanks for the explanation!

[...]

> > +static int cedrus_release(struct file *file)
> > +{
> > + struct cedrus_dev *dev = video_drvdata(file);
> > + struct cedrus_ctx *ctx = container_of(file->private_data,
> > + struct cedrus_ctx, fh);
> > +
> > + mutex_lock(&dev->dev_mutex);
> > +
> > + v4l2_fh_del(&ctx->fh);
> > + v4l2_m2m_ctx_release(ctx->fh.m2m_ctx);
> > +
> > + v4l2_ctrl_handler_free(&ctx->hdl);
> > + kfree(ctx->ctrls);
> > +
> > + v4l2_fh_exit(&ctx->fh);
> > + v4l2_fh_exit(&ctx->fh);
>
> Why call this twice?

Woops, looks like a mistake.

[...]

> > +void cedrus_device_run(void *priv)
> > +{
> > + struct cedrus_ctx *ctx = priv;
> > + struct cedrus_dev *dev = ctx->dev;
> > + struct cedrus_run run = { 0 };
> > + struct media_request *src_req;
> > + unsigned long flags;
> > +
> > + run.src = v4l2_m2m_next_src_buf(ctx->fh.m2m_ctx);
> > + run.dst = v4l2_m2m_next_dst_buf(ctx->fh.m2m_ctx);
> > +
> > + /* Apply request(s) controls if needed. */
> > + src_req = run.src->vb2_buf.req_obj.req;
> > +
> > + if (src_req)
> > + v4l2_ctrl_request_setup(src_req, &ctx->hdl);
> > +
> > + ctx->job_abort = 0;
> > +
> > + spin_lock_irqsave(&ctx->dev->irq_lock, flags);
> > +
> > + switch (ctx->src_fmt.pixelformat) {
> > + case V4L2_PIX_FMT_MPEG2_SLICE:
> > + run.mpeg2.slice_params = cedrus_find_control_data(ctx,
> > + V4L2_CID_MPEG_VIDEO_MPEG2_SLICE_PARAMS);
> > + run.mpeg2.quantization = cedrus_find_control_data(ctx,
> > + V4L2_CID_MPEG_VIDEO_MPEG2_QUANTIZATION);
> > + break;
> > +
> > + default:
> > + ctx->job_abort = 1;
>
> Add break; here.

Good catch, will do.

[...]

> > +static int cedrus_querycap(struct file *file, void *priv,
> > + struct v4l2_capability *cap)
> > +{
> > + strncpy(cap->driver, CEDRUS_NAME, sizeof(cap->driver) - 1);
> > + strncpy(cap->card, CEDRUS_NAME, sizeof(cap->card) - 1);
> > + snprintf(cap->bus_info, sizeof(cap->bus_info),
> > + "platform:%s", CEDRUS_NAME);
> > +
> > + cap->device_caps = V4L2_CAP_VIDEO_M2M_MPLANE | V4L2_CAP_STREAMING;
> > + cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
>
> Set device_caps in struct video_device and drop these two lines here.
> The v4l2 core will take care of setting device_caps and capabilities.

Nice, will do!

> > +static int cedrus_start_streaming(struct vb2_queue *q, unsigned int count)
> > +{
> > + struct cedrus_ctx *ctx = vb2_get_drv_priv(q);
> > + struct cedrus_dev *dev = ctx->dev;
> > + int ret = 0;
> > +
> > + switch (ctx->src_fmt.pixelformat) {
> > + case V4L2_PIX_FMT_MPEG2_SLICE:
> > + ctx->current_codec = CEDRUS_CODEC_MPEG2;
> > + break;
> > + default:
> > + return -EINVAL;
> > + }
> > +
> > + if (V4L2_TYPE_IS_OUTPUT(q->type) &&
> > + dev->dec_ops[ctx->current_codec]->start)
> > + ret = dev->dec_ops[ctx->current_codec]->start(ctx);
> > +
> > + return ret;
>
> If start_streaming returns an error, then all queued buffers need to
> be returned to vb2 with state VB2_BUF_STATE_QUEUED.

Okay, so I suppose I will take the code from streamoff, make it common
and pass it the target buf state.

> > +int cedrus_queue_init(void *priv, struct vb2_queue *src_vq,
> > + struct vb2_queue *dst_vq)
> > +{
> > + struct cedrus_ctx *ctx = priv;
> > + int ret;
> > +
> > + src_vq->type = V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE;
> > + src_vq->io_modes = VB2_MMAP | VB2_DMABUF;
> > + src_vq->drv_priv = ctx;
> > + src_vq->buf_struct_size = sizeof(struct cedrus_buffer);
> > + src_vq->allow_zero_bytesused = 1;
>
> Don't use this, it's deprecated. Implement VIDIOC_DECODER_CMD instead.

Looks like we can just get rid of it at this point, it's not used by
userspace to indicate that there is no data left to send.

> > + src_vq->min_buffers_needed = 1;
> > + src_vq->ops = &cedrus_qops;
> > + src_vq->mem_ops = &vb2_dma_contig_memops;
> > + src_vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY;
> > + src_vq->lock = &ctx->dev->dev_mutex;
> > + src_vq->dev = ctx->dev->dev;
> > +
> > + ret = vb2_queue_init(src_vq);
> > + if (ret)
> > + return ret;
> > +
> > + dst_vq->type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
> > + dst_vq->io_modes = VB2_MMAP | VB2_DMABUF;
> > + dst_vq->drv_priv = ctx;
> > + dst_vq->buf_struct_size = sizeof(struct cedrus_buffer);
> > + dst_vq->allow_zero_bytesused = 1;
>
> Ditto. It's pointless for the capture side anyway.
>
> > + dst_vq->min_buffers_needed = 1;
> > + dst_vq->ops = &cedrus_qops;
> > + dst_vq->mem_ops = &vb2_dma_contig_memops;
> > + dst_vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY;
> > + dst_vq->lock = &ctx->dev->dev_mutex;
> > + dst_vq->dev = ctx->dev->dev;
> > +
> > + return vb2_queue_init(dst_vq);
> > +}
> > diff --git a/drivers/staging/media/sunxi/cedrus/cedrus_video.h b/drivers/staging/media/sunxi/cedrus/cedrus_video.h
> > new file mode 100644
> > index 000000000000..56afcc8c02ba
> > --- /dev/null
> > +++ b/drivers/staging/media/sunxi/cedrus/cedrus_video.h
> > @@ -0,0 +1,31 @@
> > +/* SPDX-License-Identifier: GPL-2.0 */
> > +/*
> > + * Sunxi-Cedrus VPU driver
> > + *
> > + * Copyright (C) 2018 Paul Kocialkowski <paul.kocialkowski@bootlin.com>
> > + * Copyright (C) 2016 Florent Revest <florent.revest@free-electrons.com>
> > + *
> > + * Based on the vim2m driver, that is:
> > + *
> > + * Copyright (c) 2009-2010 Samsung Electronics Co., Ltd.
> > + * Pawel Osciak, <pawel@osciak.com>
> > + * Marek Szyprowski, <m.szyprowski@samsung.com>
> > + */
> > +
> > +#ifndef _CEDRUS_VIDEO_H_
> > +#define _CEDRUS_VIDEO_H_
> > +
> > +struct cedrus_format {
> > + u32 pixelformat;
> > + u32 directions;
> > + unsigned int num_planes;
> > + unsigned int num_buffers;
> > + unsigned int capabilities;
> > +};
> > +
> > +extern const struct v4l2_ioctl_ops cedrus_ioctl_ops;
> > +
> > +int cedrus_queue_init(void *priv, struct vb2_queue *src_vq,
> > + struct vb2_queue *dst_vq);
> > +
> > +#endif

Cheers,

Paul

--
Paul Kocialkowski, Bootlin (formerly Free Electrons)
Embedded Linux and kernel engineering
https://bootlin.com
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