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Date:   Thu, 8 Jun 2023 16:06:48 +0200
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Subject: Re: [PATCH v2,04/10] media: mediatek: vcodec: remove the dependency
 of debug log
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To:     Nicolas Dufresne <nicolas.dufresne@collabora.com>,
        =?UTF-8?B?WXVuZmVpIERvbmcgKOiRo+S6kemjnik=?= 
        <Yunfei.Dong@mediatek.com>,
        "nhebert@chromium.org" <nhebert@chromium.org>,
        "wenst@chromium.org" <wenst@chromium.org>,
        "nfraprado@collabora.com" <nfraprado@collabora.com>,
        "benjamin.gaignard@collabora.com" <benjamin.gaignard@collabora.com>,
        "hverkuil-cisco@xs4all.nl" <hverkuil-cisco@xs4all.nl>
Cc:     "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "linux-mediatek@lists.infradead.org" 
        <linux-mediatek@lists.infradead.org>,
        "frkoenig@chromium.org" <frkoenig@chromium.org>,
        "stevecho@chromium.org" <stevecho@chromium.org>,
        "linux-media@vger.kernel.org" <linux-media@vger.kernel.org>,
        "devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
        "daniel@ffwll.ch" <daniel@ffwll.ch>,
        Project_Global_Chrome_Upstream_Group 
        <Project_Global_Chrome_Upstream_Group@mediatek.com>,
        "hsinyi@chromium.org" <hsinyi@chromium.org>,
        "linux-arm-kernel@lists.infradead.org" 
        <linux-arm-kernel@lists.infradead.org>
References: <20230607084901.28021-1-yunfei.dong@mediatek.com>
 <20230607084901.28021-5-yunfei.dong@mediatek.com>
 <ad28c125d9efca1f7e422fffe42dd56cef66b349.camel@collabora.com>
 <6bb7e4b283332f1b76c1550347cb245a57eee90b.camel@mediatek.com>
 <ac3f4becf89d909503caeb8a05883fc38afccd41.camel@collabora.com>
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@collabora.com>
In-Reply-To: <ac3f4becf89d909503caeb8a05883fc38afccd41.camel@collabora.com>
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Il 08/06/23 15:11, Nicolas Dufresne ha scritto:
> Le jeudi 08 juin 2023 à 07:27 +0000, Yunfei Dong (董云飞) a écrit :
>> Hi Nicolas,
>>
>> Thanks for your review.
>> On Wed, 2023-06-07 at 21:41 -0400, Nicolas Dufresne wrote:
>>>   	
>>> External email : Please do not click links or open attachments until
>>> you have verified the sender or the content.
>>>   Hi Yunfei,
>>>
>>> Le mercredi 07 juin 2023 à 16:48 +0800, Yunfei Dong a écrit :
>>>> 'mtk_vcodec_debug' and 'mtk_vcodec_err' depends on 'mtk_vcodec_ctx'
>>>> to get the index of each instance, using the index directly instead
>>>> of with 'mtk_vcodec_ctx'.
>>>>
>>>> Signed-off-by: Yunfei Dong <yunfei.dong@mediatek.com>
>>>> ---
>>>>   .../mediatek/vcodec/mtk_vcodec_util.h         |  26 ++-
>>>>   .../vcodec/vdec/vdec_av1_req_lat_if.c         | 105 +++++++-----
>>>>   .../mediatek/vcodec/vdec/vdec_h264_if.c       |  62 ++++---
>>>>   .../mediatek/vcodec/vdec/vdec_h264_req_if.c   |  39 +++--
>>>>   .../vcodec/vdec/vdec_h264_req_multi_if.c      |  80 +++++----
>>>>   .../vcodec/vdec/vdec_hevc_req_multi_if.c      |  67 ++++----
>>>>   .../mediatek/vcodec/vdec/vdec_vp8_if.c        |  54 ++++---
>>>>   .../mediatek/vcodec/vdec/vdec_vp8_req_if.c    |  46 +++---
>>>>   .../mediatek/vcodec/vdec/vdec_vp9_if.c        | 152 ++++++++++--
>>> ------
>>>>   .../vcodec/vdec/vdec_vp9_req_lat_if.c         |  84 ++++++----
>>>>   .../platform/mediatek/vcodec/vdec_vpu_if.c    |  59 ++++---
>>>>   .../mediatek/vcodec/venc/venc_h264_if.c       |  86 +++++-----
>>>>   .../mediatek/vcodec/venc/venc_vp8_if.c        |  48 +++---
>>>>   .../platform/mediatek/vcodec/venc_vpu_if.c    |  64 ++++----
>>>>   14 files changed, 565 insertions(+), 407 deletions(-)
>>>>
>>>> diff --git
>>> a/drivers/media/platform/mediatek/vcodec/mtk_vcodec_util.h
>>> b/drivers/media/platform/mediatek/vcodec/mtk_vcodec_util.h
>>>> index ecb0bdf3a4f4..ddc12c3e2983 100644
>>>> --- a/drivers/media/platform/mediatek/vcodec/mtk_vcodec_util.h
>>>> +++ b/drivers/media/platform/mediatek/vcodec/mtk_vcodec_util.h
>>>> @@ -31,9 +31,8 @@ struct mtk_vcodec_dev;
>>>>   #define mtk_v4l2_err(fmt, args...)                \
>>>>   pr_err("[MTK_V4L2][ERROR] " fmt "\n", ##args)
>>>>   
>>>> -#define mtk_vcodec_err(h, fmt, args...)\
>>>> -pr_err("[MTK_VCODEC][ERROR][%d]: " fmt "\n",\
>>>> -       ((struct mtk_vcodec_ctx *)(h)->ctx)->id, ##args)
>>>> +#define mtk_vcodec_err(plat_dev, inst_id, fmt,
>>> args...)                                 \
>>>> +dev_err(&(plat_dev)->dev, "[MTK_VCODEC][ERROR][%d]: " fmt "\n",
>>> inst_id, ##args)
>>>>   
>>>>   #if defined(CONFIG_DEBUG_FS)
>>>>   extern int mtk_v4l2_dbg_level;
>>>> @@ -46,27 +45,24 @@ extern int mtk_vcodec_dbg;
>>>>    __func__, __LINE__, ##args);        \
>>>>   } while (0)
>>>>   
>>>> -#define mtk_vcodec_debug(h, fmt, args...)                      \
>>>> -do {                      \
>>>> -if (mtk_vcodec_dbg)                      \
>>>> -dev_dbg(&(((struct mtk_vcodec_ctx *)(h)->ctx)->dev->plat_dev-
>>>> dev),   \
>>>> -"[MTK_VCODEC][%d]: %s, %d " fmt "\n",                         \
>>>> -((struct mtk_vcodec_ctx *)(h)->ctx)->id,                      \
>>>> -__func__, __LINE__, ##args);                                  \
>>>> +#define mtk_vcodec_debug(plat_dev, inst_id, fmt,
>>> args...)                               \
>>>> +do
>>> {
>>>          \
>>>> +if
>>> (mtk_vcodec_dbg)
>>> \
>>>> +dev_dbg(&(plat_dev)->dev, "[MTK_VCODEC][%d]: %s, %d " fmt "\n", \
>>>
>>> At least in this patch, you systematically pass plat_dev as
>>> <something>->ctx->dev->plat_dev, which is quite long and verbose, any
>>> reason we
>>> can't just pass that <something> here ? We can follow the same
>>> structure path
>>> for both encoder/decoder ?
>>>
>>
>> In order to separate encode and decoder, need to define two different
>> struct mtk_vcodec_dec_ctx and struct mtk_vcodec_enc_ctx.
>>
>> struct mtk_vcodec_ctx won't be used again, need to use platform device
>> to print dev_dbg and dev_err.
>>
>> encoder and decoder using the same interface to print log message.
> 
> Just a reminder, I'm just making suggestions, there is no strict action required
> here other then a discussion to try and make the logging a bit more light.
> 
> My points was that C macros don't care about types, so if you keep the path to
> the platform device the same (ctx->dev->plat_dev), you could just pass the ctx
> as argument. What I don't know though myself, is if this is actually feasible in
> all code path, but considering you had access to the instance previously, I
> thought it should.
> 

One macro used to access two different structures?

Please, no.

Regards,
Angelo

> regards,
> Nicolas
> 
>>
>> Best Regards,
>> Yunfei Dong
>>>> +inst_id, __func__, __LINE__, ##args);                   \
>>>>   } while (0)
>>>>   #else
>>>>   #define mtk_v4l2_debug(level, fmt, args...) pr_debug(fmt, ##args)
>>>>   
>>>> -#define mtk_vcodec_debug(h, fmt, args...)\
>>>> -pr_debug("[MTK_VCODEC][%d]: " fmt "\n",\
>>>
>> ...snip...
>