linux-kernel - Re: [PATCH v5,2/2] media: mediatek: vcodec: support stateless hevc decoder

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Message-ID: <2dde9a06-1ed3-f95e-f11e-91b65c039c92@collabora.com>
Date:   Wed, 24 May 2023 09:35:54 +0200
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     Yunfei Dong <yunfei.dong@...iatek.com>,
        Chen-Yu Tsai <wenst@...omium.org>,
        Nicolas Dufresne <nicolas.dufresne@...labora.com>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Benjamin Gaignard <benjamin.gaignard@...labora.com>,
        Nícolas F . R . A . Prado 
        <nfraprado@...labora.com>, Nathan Hebert <nhebert@...omium.org>
Cc:     Hsin-Yi Wang <hsinyi@...omium.org>,
        Fritz Koenig <frkoenig@...omium.org>,
        Daniel Vetter <daniel@...ll.ch>,
        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,
        linux-mediatek@...ts.infradead.org,
        Project_Global_Chrome_Upstream_Group@...iatek.com
Subject: Re: [PATCH v5,2/2] media: mediatek: vcodec: support stateless hevc
 decoder

Il 24/05/23 04:16, Yunfei Dong ha scritto:
> Add mediatek hevc decoder linux driver which use the stateless API in MT8195.
> 
> Signed-off-by: Yunfei Dong <yunfei.dong@...iatek.com>
> Tested-by: Nicolas Dufresne <nicolas.dufresne@...labora.com>
> Tested-by: Nathan Hebert <nhebert@...omium.org>
> ---
>   .../media/platform/mediatek/vcodec/Makefile   |    1 +
>   .../vcodec/mtk_vcodec_dec_stateless.c         |   59 +-
>   .../platform/mediatek/vcodec/mtk_vcodec_drv.h |    1 +
>   .../vcodec/vdec/vdec_hevc_req_multi_if.c      | 1101 +++++++++++++++++
>   .../platform/mediatek/vcodec/vdec_drv_if.c    |    4 +
>   .../platform/mediatek/vcodec/vdec_drv_if.h    |    1 +
>   6 files changed, 1166 insertions(+), 1 deletion(-)
>   create mode 100644 drivers/media/platform/mediatek/vcodec/vdec/vdec_hevc_req_multi_if.c
> 

..snip..

> diff --git a/drivers/media/platform/mediatek/vcodec/vdec/vdec_hevc_req_multi_if.c b/drivers/media/platform/mediatek/vcodec/vdec/vdec_hevc_req_multi_if.c
> new file mode 100644
> index 000000000000..9a96547af33c
> --- /dev/null
> +++ b/drivers/media/platform/mediatek/vcodec/vdec/vdec_hevc_req_multi_if.c
> @@ -0,0 +1,1101 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (c) 2023 MediaTek Inc.
> + * Author: Yunfei Dong <yunfei.dong@...iatek.com>
> + */
> +

..snip..

> +
> +/**
> + * struct vdec_hevc_slice_share_info - shared information used to exchange
> + *                                     message between lat and core
> + *
> + * @sps:               sequence header information from user space
> + * @dec_params:        decoder params from user space
> + * @hevc_slice_params: decoder params used for hardware
> + * @trans_start:       trans start dma address
> + * @trans_end:         trans end dma address

Wrong documentation, there's no trans_start, trans_end, but just `trans`.

> + */
> +struct vdec_hevc_slice_share_info {
> +	struct v4l2_ctrl_hevc_sps sps;
> +	struct v4l2_ctrl_hevc_decode_params dec_params;
> +	struct vdec_hevc_slice_lat_dec_param hevc_slice_params;
> +	struct vdec_hevc_slice_mem trans;
> +};
> +
> +/**
> + * struct vdec_hevc_slice_inst - hevc decoder instance
> + *
> + * @slice_dec_num:      how many picture be decoded
> + * @ctx:                point to mtk_vcodec_ctx
> + * @pred_buf:           HW working predication buffer

pred_buf is not present in this structure; either add it and make use
of it, or remove the documentation for it.

> + * @mv_buf:             HW working motion vector buffer
> + * @vpu:                VPU instance
> + * @vsi:                vsi used for lat
> + * @vsi_core:           vsi used for core
> + * @wrap_addr:          wrap address used for hevc
> + *
> + * @hevc_slice_param:   the parameters that hardware use to decode
> + *
> + * @resolution_changed: resolution changed
> + * @realloc_mv_buf:     reallocate mv buffer
> + * @cap_num_planes:     number of capture queue plane
> + */
> +struct vdec_hevc_slice_inst {
> +	unsigned int slice_dec_num;
> +	struct mtk_vcodec_ctx *ctx;
> +	struct mtk_vcodec_mem mv_buf[HEVC_MAX_MV_NUM];
> +	struct vdec_vpu_inst vpu;
> +	struct vdec_hevc_slice_vsi *vsi;
> +	struct vdec_hevc_slice_vsi *vsi_core;
> +	struct mtk_vcodec_mem wrap_addr;
> +
> +	struct vdec_hevc_slice_lat_dec_param hevc_slice_param;
> +
> +	unsigned int resolution_changed;
> +	unsigned int realloc_mv_buf;
> +	unsigned int cap_num_planes;
> +};
> +
> +static unsigned int vdec_hevc_get_mv_buf_size(unsigned int width, unsigned int height)
> +{
> +	const int unit_size = (width / 16) * (height / 16) + 8;

This is supposed to be `const unsigned int`, otherwise you may overflow here (even
if it's unlikely to, but still....!)

> +
> +	return 64 * unit_size;
> +}
> +

..snip..

> +static int vdec_hevc_slice_lat_decode(void *h_vdec, struct mtk_vcodec_mem *bs,
> +				      struct vdec_fb *fb, bool *res_chg)
> +{
> +	struct vdec_hevc_slice_inst *inst = h_vdec;
> +	struct vdec_vpu_inst *vpu = &inst->vpu;
> +

Please remove this extra empty line.

> +	int err, timeout = 0;
> +	unsigned int data[2];
> +	struct vdec_lat_buf *lat_buf;
> +	struct vdec_hevc_slice_share_info *share_info;
> +

...after which:

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>