linux-kernel - Re: [PATCH v1 11/18] media: hantro: Add helper function for auxiliary buffers allocation

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Date:   Wed, 17 Feb 2021 17:42:21 -0300
From:   Ezequiel Garcia <ezequiel@...labora.com>
To:     Benjamin Gaignard <benjamin.gaignard@...labora.com>,
        p.zabel@...gutronix.de, mchehab@...nel.org, robh+dt@...nel.org,
        shawnguo@...nel.org, s.hauer@...gutronix.de, kernel@...gutronix.de,
        festevam@...il.com, linux-imx@....com, gregkh@...uxfoundation.org,
        mripard@...nel.org, paul.kocialkowski@...tlin.com, wens@...e.org,
        jernej.skrabec@...l.net, krzk@...nel.org, shengjiu.wang@....com,
        adrian.ratiu@...labora.com, aisheng.dong@....com, peng.fan@....com,
        Anson.Huang@....com, hverkuil-cisco@...all.nl
Cc:     linux-media@...r.kernel.org, linux-rockchip@...ts.infradead.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, devel@...verdev.osuosl.org,
        kernel@...labora.com
Subject: Re: [PATCH v1 11/18] media: hantro: Add helper function for
 auxiliary buffers allocation

Hi Benjamin,

On Wed, 2021-02-17 at 09:02 +0100, Benjamin Gaignard wrote:
> Add helper functions to allocate and free auxiliary buffers.
> These buffers aren't for frames but are needed by the hardware
> to store scaling matrix, tiles size, border filters etc...
> 
> Signed-off-by: Benjamin Gaignard <benjamin.gaignard@...labora.com>
> Signed-off-by: Ezequiel Garcia <ezequiel@...labora.com>
> Signed-off-by: Adrian Ratiu <adrian.ratiu@...labora.com>
> ---
>  drivers/staging/media/hantro/hantro.h | 24 ++++++++++++++++++++++++
>  1 file changed, 24 insertions(+)
> 
> diff --git a/drivers/staging/media/hantro/hantro.h b/drivers/staging/media/hantro/hantro.h
> index a9b80b2c9124..7f842edbc341 100644
> --- a/drivers/staging/media/hantro/hantro.h
> +++ b/drivers/staging/media/hantro/hantro.h
> @@ -446,6 +446,30 @@ hantro_get_dec_buf(struct hantro_ctx *ctx, struct vb2_buffer *vb)
>         return vb2_plane_vaddr(vb, 0);
>  }
>  
> +static inline int
> +hantro_aux_buf_alloc(struct hantro_dev *vpu,
> +                    struct hantro_aux_buf *buf, size_t size)
> +{

Can you add convert the dma_alloc_ calls in the driver,
and squash it in this patch?

I.e. hantro_h264_dec_init, hantro_vp8_dec_init, etc.

Thanks!
Ezequiel

> +       buf->cpu = dma_alloc_coherent(vpu->dev, size, &buf->dma, GFP_KERNEL);
> +       if (!buf->cpu)
> +               return -ENOMEM;
> +
> +       buf->size = size;
> +       return 0;
> +}
> +
> +static inline void
> +hantro_aux_buf_free(struct hantro_dev *vpu,
> +                   struct hantro_aux_buf *buf)
> +{
> +       if (buf->cpu)
> +               dma_free_coherent(vpu->dev, buf->size, buf->cpu, buf->dma);
> +
> +       buf->cpu = NULL;
> +       buf->dma = 0;
> +       buf->size = 0;
> +}
> +
>  void hantro_postproc_disable(struct hantro_ctx *ctx);
>  void hantro_postproc_enable(struct hantro_ctx *ctx);
>  void hantro_postproc_free(struct hantro_ctx *ctx);