Date:   Thu, 17 Feb 2022 17:03:07 +0800
From:   "yunfei.dong@...iatek.com" <yunfei.dong@...iatek.com>
To:     Nicolas Dufresne <nicolas@...fresne.ca>,
        Alexandre Courbot <acourbot@...omium.org>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        "Tzung-Bi Shih" <tzungbi@...omium.org>,
        Tiffany Lin <tiffany.lin@...iatek.com>,
        Andrew-CT Chen <andrew-ct.chen@...iatek.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Tomasz Figa <tfiga@...gle.com>
CC:     George Sun <george.sun@...iatek.com>,
        Xiaoyong Lu <xiaoyong.lu@...iatek.com>,
        Hsin-Yi Wang <hsinyi@...omium.org>,
        "Fritz Koenig" <frkoenig@...omium.org>,
        Dafna Hirschfeld <dafna.hirschfeld@...labora.com>,
        Benjamin Gaignard <benjamin.gaignard@...labora.com>,
        Daniel Vetter <daniel@...ll.ch>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        Irui Wang <irui.wang@...iatek.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Steve Cho <stevecho@...omium.org>,
        <linux-media@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <srv_heupstream@...iatek.com>,
        <linux-mediatek@...ts.infradead.org>,
        <Project_Global_Chrome_Upstream_Group@...iatek.com>
Subject: Re: [PATCH v6, 06/15] media: mtk-vcodec: Refactor get and put
 capture buffer flow

Hi nicolas,

Thanks for your suggestion.
On Fri, 2022-01-28 at 16:49 -0500, Nicolas Dufresne wrote:
> Hi Yunfei,
> 
> thanks for you work, see comments below...
> 
> Le samedi 22 janvier 2022 à 11:53 +0800, Yunfei Dong a écrit :
> > For lat and core decode in parallel, need to get capture buffer
> > when core start to decode and put capture buffer to display
> > list when core decode done.
> > 
> > Signed-off-by: Yunfei Dong <yunfei.dong@...iatek.com>
> > ---
> >  .../mtk-vcodec/mtk_vcodec_dec_stateless.c     | 121 ++++++++++++
> > ------
> >  .../platform/mtk-vcodec/mtk_vcodec_drv.h      |   5 +-
> >  .../mtk-vcodec/vdec/vdec_h264_req_if.c        |  16 ++-
> >  3 files changed, 102 insertions(+), 40 deletions(-)
> > 
> > diff --git a/drivers/media/platform/mtk-
> > vcodec/mtk_vcodec_dec_stateless.c b/drivers/media/platform/mtk-
> > vcodec/mtk_vcodec_dec_stateless.c
> > index 23a154c4e321..6d481410bf89 100644
> > --- a/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_stateless.c
> > +++ b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_stateless.c
> > @@ -108,37 +108,87 @@ static const struct mtk_codec_framesizes
> > mtk_vdec_framesizes[] = {
> >  
> >  #define NUM_SUPPORTED_FRAMESIZE ARRAY_SIZE(mtk_vdec_framesizes)
> >  
> > -static void mtk_vdec_stateless_set_dst_payload(struct
> > mtk_vcodec_ctx *ctx,
> > -					       struct vdec_fb *fb)
> > +static void mtk_vdec_stateless_out_to_done(struct mtk_vcodec_ctx
> > *ctx,
> > +					   struct mtk_vcodec_mem *bs,
> > int error)
> >  {
> > -	struct mtk_video_dec_buf *vdec_frame_buf =
> > -		container_of(fb, struct mtk_video_dec_buf,
> > frame_buffer);
> > -	struct vb2_v4l2_buffer *vb = &vdec_frame_buf->m2m_buf.vb;
> > -	unsigned int cap_y_size = ctx-
> > >q_data[MTK_Q_DATA_DST].sizeimage[0];
> > +	struct mtk_video_dec_buf *out_buf;
> > +	struct vb2_v4l2_buffer *vb;
> >  
> > -	vb2_set_plane_payload(&vb->vb2_buf, 0, cap_y_size);
> > -	if (ctx->q_data[MTK_Q_DATA_DST].fmt->num_planes == 2) {
> > -		unsigned int cap_c_size =
> > -			ctx->q_data[MTK_Q_DATA_DST].sizeimage[1];
> > +	if (!bs) {
> > +		mtk_v4l2_err("Free bitstream buffer fail.");
> > +		return;
> > +	}
> > +	out_buf = container_of(bs, struct mtk_video_dec_buf,
> > bs_buffer);
> > +	vb = &out_buf->m2m_buf.vb;
> >  
> > -		vb2_set_plane_payload(&vb->vb2_buf, 1, cap_c_size);
> > +	mtk_v4l2_debug(2, "Free bitsteam buffer id = %d to done_list",
> > +		       vb->vb2_buf.index);
> > +
> > +	v4l2_m2m_src_buf_remove(ctx->m2m_ctx);
> > +	if (error) {
> > +		v4l2_m2m_buf_done(vb, VB2_BUF_STATE_ERROR);
> > +		if (error == -EIO)
> > +			out_buf->error = true;
> > +	} else {
> > +		v4l2_m2m_buf_done(vb, VB2_BUF_STATE_DONE);
> >  	}
> >  }
> >  
> > -static struct vdec_fb *vdec_get_cap_buffer(struct mtk_vcodec_ctx
> > *ctx,
> > -					   struct vb2_v4l2_buffer
> > *vb2_v4l2)
> > +static void mtk_vdec_stateless_cap_to_disp(struct mtk_vcodec_ctx
> > *ctx,
> > +					   struct vdec_fb *fb, int
> > error)
> >  {
> > -	struct mtk_video_dec_buf *framebuf =
> > -		container_of(vb2_v4l2, struct mtk_video_dec_buf,
> > m2m_buf.vb);
> > -	struct vdec_fb *pfb = &framebuf->frame_buffer;
> > -	struct vb2_buffer *dst_buf = &vb2_v4l2->vb2_buf;
> > +	struct mtk_video_dec_buf *vdec_frame_buf;
> > +	struct vb2_v4l2_buffer *vb;
> > +	unsigned int cap_y_size, cap_c_size;
> > +
> > +	if (!fb) {
> > +		mtk_v4l2_err("Free frame buffer fail.");
> > +		return;
> > +	}
> > +	vdec_frame_buf = container_of(fb, struct mtk_video_dec_buf,
> > +				      frame_buffer);
> > +	vb = &vdec_frame_buf->m2m_buf.vb;
> > +
> > +	cap_y_size = ctx->q_data[MTK_Q_DATA_DST].sizeimage[0];
> > +	cap_c_size = ctx->q_data[MTK_Q_DATA_DST].sizeimage[1];
> > +
> > +	v4l2_m2m_dst_buf_remove(ctx->m2m_ctx);
> >  
> > -	pfb->base_y.va = NULL;
> > +	vb2_set_plane_payload(&vb->vb2_buf, 0, cap_y_size);
> > +	if (ctx->q_data[MTK_Q_DATA_DST].fmt->num_planes == 2)
> > +		vb2_set_plane_payload(&vb->vb2_buf, 1, cap_c_size);
> > +
> > +	mtk_v4l2_debug(2, "Free frame buffer id = %d to done_list",
> > +		       vb->vb2_buf.index);
> > +	if (error)
> > +		v4l2_m2m_buf_done(vb, VB2_BUF_STATE_ERROR);
> > +	else
> > +		v4l2_m2m_buf_done(vb, VB2_BUF_STATE_DONE);
> > +}
> > +
> > +static struct vdec_fb *vdec_get_cap_buffer(struct mtk_vcodec_ctx
> > *ctx)
> > +{
> > +	struct mtk_video_dec_buf *framebuf;
> > +	struct vb2_v4l2_buffer *vb2_v4l2;
> > +	struct vb2_buffer *dst_buf;
> > +	struct vdec_fb *pfb;
> > +
> > +	vb2_v4l2 = v4l2_m2m_next_dst_buf(ctx->m2m_ctx);
> > +	if (!vb2_v4l2) {
> > +		mtk_v4l2_debug(1, "[%d] dst_buf empty!!", ctx->id);
> > +		return NULL;
> > +	}
> > +
> > +	dst_buf = &vb2_v4l2->vb2_buf;
> > +	framebuf = container_of(vb2_v4l2, struct mtk_video_dec_buf,
> > m2m_buf.vb);
> > +
> > +	pfb = &framebuf->frame_buffer;
> > +	pfb->base_y.va = vb2_plane_vaddr(dst_buf, 0);
> >  	pfb->base_y.dma_addr = vb2_dma_contig_plane_dma_addr(dst_buf,
> > 0);
> >  	pfb->base_y.size = ctx->q_data[MTK_Q_DATA_DST].sizeimage[0];
> >  
> >  	if (ctx->q_data[MTK_Q_DATA_DST].fmt->num_planes == 2) {
> > -		pfb->base_c.va = NULL;
> > +		pfb->base_c.va = vb2_plane_vaddr(dst_buf, 1);
> >  		pfb->base_c.dma_addr =
> >  			vb2_dma_contig_plane_dma_addr(dst_buf, 1);
> >  		pfb->base_c.size = ctx-
> > >q_data[MTK_Q_DATA_DST].sizeimage[1];
> > @@ -162,12 +212,11 @@ static void mtk_vdec_worker(struct
> > work_struct *work)
> >  	struct mtk_vcodec_ctx *ctx =
> >  		container_of(work, struct mtk_vcodec_ctx, decode_work);
> >  	struct mtk_vcodec_dev *dev = ctx->dev;
> > -	struct vb2_v4l2_buffer *vb2_v4l2_src, *vb2_v4l2_dst;
> > +	struct vb2_v4l2_buffer *vb2_v4l2_src;
> >  	struct vb2_buffer *vb2_src;
> >  	struct mtk_vcodec_mem *bs_src;
> >  	struct mtk_video_dec_buf *dec_buf_src;
> >  	struct media_request *src_buf_req;
> > -	struct vdec_fb *dst_buf;
> >  	bool res_chg = false;
> >  	int ret;
> >  
> > @@ -178,13 +227,6 @@ static void mtk_vdec_worker(struct work_struct
> > *work)
> >  		return;
> >  	}
> >  
> > -	vb2_v4l2_dst = v4l2_m2m_next_dst_buf(ctx->m2m_ctx);
> > -	if (!vb2_v4l2_dst) {
> > -		v4l2_m2m_job_finish(dev->m2m_dev_dec, ctx->m2m_ctx);
> > -		mtk_v4l2_debug(1, "[%d] no available destination
> > buffer", ctx->id);
> > -		return;
> > -	}
> > -
> >  	vb2_src = &vb2_v4l2_src->vb2_buf;
> >  	dec_buf_src = container_of(vb2_v4l2_src, struct
> > mtk_video_dec_buf,
> >  				   m2m_buf.vb);
> > @@ -193,9 +235,15 @@ static void mtk_vdec_worker(struct work_struct
> > *work)
> >  	mtk_v4l2_debug(3, "[%d] (%d) id=%d, vb=%p", ctx->id,
> >  		       vb2_src->vb2_queue->type, vb2_src->index,
> > vb2_src);
> >  
> > -	bs_src->va = NULL;
> > +	bs_src->va = vb2_plane_vaddr(vb2_src, 0);
> >  	bs_src->dma_addr = vb2_dma_contig_plane_dma_addr(vb2_src, 0);
> >  	bs_src->size = (size_t)vb2_src->planes[0].bytesused;
> > +	if (!bs_src->va) {
> > +		v4l2_m2m_job_finish(dev->m2m_dev_dec, ctx->m2m_ctx);
> > +		mtk_v4l2_err("[%d] id=%d source buffer is NULL", ctx-
> > >id,
> > +			     vb2_src->index);
> > +		return;
> > +	}
> >  
> >  	mtk_v4l2_debug(3, "[%d] Bitstream VA=%p DMA=%pad Size=%zx
> > vb=%p",
> >  		       ctx->id, bs_src->va, &bs_src->dma_addr, bs_src-
> > >size, vb2_src);
> > @@ -206,9 +254,7 @@ static void mtk_vdec_worker(struct work_struct
> > *work)
> >  	else
> >  		mtk_v4l2_err("vb2 buffer media request is NULL");
> >  
> > -	dst_buf = vdec_get_cap_buffer(ctx, vb2_v4l2_dst);
> > -	v4l2_m2m_buf_copy_metadata(vb2_v4l2_src, vb2_v4l2_dst, true);
> 
> Please keep using this helper, it is specially crafted to ease
> maintenance.
Move this function to each codec inside, for lat and core decode in
parallel, can't use this function directly in lat workqueue.
> 
> > -	ret = vdec_if_decode(ctx, bs_src, dst_buf, &res_chg);
> > +	ret = vdec_if_decode(ctx, bs_src, NULL, &res_chg);
> >  	if (ret) {
> >  		mtk_v4l2_err(" <===[%d], src_buf[%d] sz=0x%zx pts=%llu
> > vdec_if_decode() ret=%d res_chg=%d===>",
> >  			     ctx->id, vb2_src->index, bs_src->size,
> > @@ -220,12 +266,9 @@ static void mtk_vdec_worker(struct work_struct
> > *work)
> >  		}
> >  	}
> >  
> > -	mtk_vdec_stateless_set_dst_payload(ctx, dst_buf);
> > -
> > -	v4l2_m2m_buf_done_and_job_finish(dev->m2m_dev_dec, ctx-
> > >m2m_ctx,
> > -					 ret ? VB2_BUF_STATE_ERROR :
> > VB2_BUF_STATE_DONE);
> > -
> > +	mtk_vdec_stateless_out_to_done(ctx, bs_src, ret);
> 
> v4l2_m2m_buf_done_and_job_finish() was specially crafted to prevent
> developer
> from implementing the signalling of the request at the wrong moment.
> This patch
> broke this strict ordering. The relevant comment in the helper
> function:
> 
> 
As we discussed in chat, please help to check whether it's possible to
let lat and core decode in parallel.

I will continue to fix h264 issue.

Thanks for your help.

Best Regards,
Yunfei Dong
> 	/*
> 	 * If the request API is being used, returning the OUTPUT
> 	 * (src) buffer will wake-up any process waiting on the
> 	 * request file descriptor.
> 	 *
> 	 * Therefore, return the CAPTURE (dst) buffer first,
> 	 * to avoid signalling the request file descriptor
> 	 * before the CAPTURE buffer is done.
> 	 */
> 
> In short, as request signalling is bound to the src buffer, with this
> change you
> signal the request too early, which may lead userland to think it can
> DQ the
> capture buffer. I see exactly that happening when running with
> GStreamer, which
> strictly rely on the request polling. Please keep using
> v4l2_m2m_buf_done_and_job_finish(), and move it into
> mtk_vdec_stateless_cap_to_disp(). 
> 
> 
> >  	v4l2_ctrl_request_complete(src_buf_req, &ctx->ctrl_hdl);
> > +	v4l2_m2m_job_finish(dev->m2m_dev_dec, ctx->m2m_ctx);
> >  }
> >  
> >  static void vb2ops_vdec_stateless_buf_queue(struct vb2_buffer *vb)
> > @@ -358,6 +401,8 @@ const struct mtk_vcodec_dec_pdata
> > mtk_vdec_8183_pdata = {
> >  	.uses_stateless_api = true,
> >  	.worker = mtk_vdec_worker,
> >  	.flush_decoder = mtk_vdec_flush_decoder,
> > +	.cap_to_disp = mtk_vdec_stateless_cap_to_disp,
> > +	.get_cap_buffer = vdec_get_cap_buffer,
> >  	.is_subdev_supported = false,
> >  	.hw_arch = MTK_VDEC_PURE_SINGLE_CORE,
> >  };
> > @@ -376,6 +421,8 @@ const struct mtk_vcodec_dec_pdata
> > mtk_lat_sig_core_pdata = {
> >  	.uses_stateless_api = true,
> >  	.worker = mtk_vdec_worker,
> >  	.flush_decoder = mtk_vdec_flush_decoder,
> > +	.cap_to_disp = mtk_vdec_stateless_cap_to_disp,
> > +	.get_cap_buffer = vdec_get_cap_buffer,
> >  	.is_subdev_supported = true,
> >  	.hw_arch = MTK_VDEC_LAT_SINGLE_CORE,
> >  };
> > diff --git a/drivers/media/platform/mtk-vcodec/mtk_vcodec_drv.h
> > b/drivers/media/platform/mtk-vcodec/mtk_vcodec_drv.h
> > index 2d1d878692ca..e0b7d2fda632 100644
> > --- a/drivers/media/platform/mtk-vcodec/mtk_vcodec_drv.h
> > +++ b/drivers/media/platform/mtk-vcodec/mtk_vcodec_drv.h
> > @@ -353,7 +353,8 @@ enum mtk_vdec_hw_arch {
> >   * @ctrls_setup: init vcodec dec ctrls
> >   * @worker: worker to start a decode job
> >   * @flush_decoder: function that flushes the decoder
> > - *
> > + * @get_cap_buffer: get capture buffer from capture queue
> > + * @cap_to_disp: put capture buffer to disp list
> >   * @vdec_vb2_ops: struct vb2_ops
> >   *
> >   * @vdec_formats: supported video decoder formats
> > @@ -375,6 +376,8 @@ struct mtk_vcodec_dec_pdata {
> >  	int (*ctrls_setup)(struct mtk_vcodec_ctx *ctx);
> >  	void (*worker)(struct work_struct *work);
> >  	int (*flush_decoder)(struct mtk_vcodec_ctx *ctx);
> > +	struct vdec_fb *(*get_cap_buffer)(struct mtk_vcodec_ctx *ctx);
> > +	void (*cap_to_disp)(struct mtk_vcodec_ctx *ctx, struct vdec_fb
> > *fb, int error);
> >  
> >  	struct vb2_ops *vdec_vb2_ops;
> >  
> > diff --git a/drivers/media/platform/mtk-
> > vcodec/vdec/vdec_h264_req_if.c b/drivers/media/platform/mtk-
> > vcodec/vdec/vdec_h264_req_if.c
> > index 43542de11e9c..36f3dc1fbe3b 100644
> > --- a/drivers/media/platform/mtk-vcodec/vdec/vdec_h264_req_if.c
> > +++ b/drivers/media/platform/mtk-vcodec/vdec/vdec_h264_req_if.c
> > @@ -670,32 +670,42 @@ static void vdec_h264_slice_deinit(void
> > *h_vdec)
> >  }
> >  
> >  static int vdec_h264_slice_decode(void *h_vdec, struct
> > mtk_vcodec_mem *bs,
> > -				  struct vdec_fb *fb, bool *res_chg)
> > +				  struct vdec_fb *unused, bool
> > *res_chg)
> >  {
> >  	struct vdec_h264_slice_inst *inst = h_vdec;
> >  	const struct v4l2_ctrl_h264_decode_params *dec_params =
> >  		get_ctrl_ptr(inst->ctx,
> > V4L2_CID_STATELESS_H264_DECODE_PARAMS);
> >  	struct vdec_vpu_inst *vpu = &inst->vpu;
> > +	struct mtk_video_dec_buf *src_buf_info;
> > +	struct mtk_video_dec_buf *dst_buf_info;
> > +	struct vdec_fb *fb;
> >  	u32 data[2];
> >  	u64 y_fb_dma;
> >  	u64 c_fb_dma;
> >  	int err;
> >  
> > +	inst->num_nalu++;
> >  	/* bs NULL means flush decoder */
> >  	if (!bs)
> >  		return vpu_dec_reset(vpu);
> >  
> > +	fb = inst->ctx->dev->vdec_pdata->get_cap_buffer(inst->ctx);
> > +	src_buf_info = container_of(bs, struct mtk_video_dec_buf,
> > bs_buffer);
> > +	dst_buf_info = container_of(fb, struct mtk_video_dec_buf,
> > frame_buffer);
> > +
> >  	y_fb_dma = fb ? (u64)fb->base_y.dma_addr : 0;
> >  	c_fb_dma = fb ? (u64)fb->base_c.dma_addr : 0;
> >  
> >  	mtk_vcodec_debug(inst, "+ [%d] FB y_dma=%llx c_dma=%llx va=%p",
> > -			 ++inst->num_nalu, y_fb_dma, c_fb_dma, fb);
> > +			 inst->num_nalu, y_fb_dma, c_fb_dma, fb);
> >  
> >  	inst->vsi_ctx.dec.bs_dma = (uint64_t)bs->dma_addr;
> >  	inst->vsi_ctx.dec.y_fb_dma = y_fb_dma;
> >  	inst->vsi_ctx.dec.c_fb_dma = c_fb_dma;
> >  	inst->vsi_ctx.dec.vdec_fb_va = (u64)(uintptr_t)fb;
> >  
> > +	v4l2_m2m_buf_copy_metadata(&src_buf_info->m2m_buf.vb,
> > +				   &dst_buf_info->m2m_buf.vb, true);
> >  	get_vdec_decode_parameters(inst);
> >  	data[0] = bs->size;
> >  	/*
> > @@ -734,6 +744,8 @@ static int vdec_h264_slice_decode(void *h_vdec,
> > struct mtk_vcodec_mem *bs,
> >  
> >  	memcpy(&inst->vsi_ctx, inst->vpu.vsi, sizeof(inst->vsi_ctx));
> >  	mtk_vcodec_debug(inst, "\n - NALU[%d]", inst->num_nalu);
> > +
> > +	inst->ctx->dev->vdec_pdata->cap_to_disp(inst->ctx, fb, 0);
> >  	return 0;
> >  
> >  err_free_fb_out:
> 
> 

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