linux-kernel - Re: [PATCH v2,2/7] media: mediatek: vcodec: Add debug params to control different log level

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Date:   Thu, 23 Mar 2023 01:40:49 +0000
From:   Yunfei Dong (董云飞) 
        <Yunfei.Dong@...iatek.com>
To:     "wenst@...omium.org" <wenst@...omium.org>,
        "nfraprado@...labora.com" <nfraprado@...labora.com>,
        "nicolas@...fresne.ca" <nicolas@...fresne.ca>,
        "angelogioacchino.delregno@...labora.com" 
        <angelogioacchino.delregno@...labora.com>,
        "benjamin.gaignard@...labora.com" <benjamin.gaignard@...labora.com>,
        "hverkuil-cisco@...all.nl" <hverkuil-cisco@...all.nl>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mediatek@...ts.infradead.org" 
        <linux-mediatek@...ts.infradead.org>,
        "frkoenig@...omium.org" <frkoenig@...omium.org>,
        "stevecho@...omium.org" <stevecho@...omium.org>,
        "linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "daniel@...ll.ch" <daniel@...ll.ch>,
        Project_Global_Chrome_Upstream_Group 
        <Project_Global_Chrome_Upstream_Group@...iatek.com>,
        "hsinyi@...omium.org" <hsinyi@...omium.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "matthias.bgg@...il.com" <matthias.bgg@...il.com>
Subject: Re: [PATCH v2,2/7] media: mediatek: vcodec: Add debug params to
 control different log level

Hi AngeloGioacchino

Thanks for you suggestion.

On Wed, 2023-03-22 at 14:49 +0100, AngeloGioacchino Del Regno wrote:
> External email : Please do not click links or open attachments until
> you have verified the sender or the content.
> 
> 
> Il 22/03/23 10:46, Yunfei Dong ha scritto:
> > Add parameter mtk_vcodec_dbg to open each codec log.
> > Add parameter mtk_v4l2_dbg_level to open each instance log
> > according to
> > the parameter value.
> > 
> > Signed-off-by: Yunfei Dong <yunfei.dong@...iatek.com>
> > ---
> >   .../mediatek/vcodec/mtk_vcodec_dbgfs.c        |  2 ++
> >   .../mediatek/vcodec/mtk_vcodec_util.c         |  8 ++++++
> >   .../mediatek/vcodec/mtk_vcodec_util.h         | 25
> > ++++++++++++++++---
> >   3 files changed, 32 insertions(+), 3 deletions(-)
> > 
> > diff --git
> > a/drivers/media/platform/mediatek/vcodec/mtk_vcodec_dbgfs.c
> > b/drivers/media/platform/mediatek/vcodec/mtk_vcodec_dbgfs.c
> > index fb9edd379af5..b5093e4e4aa2 100644
> > --- a/drivers/media/platform/mediatek/vcodec/mtk_vcodec_dbgfs.c
> > +++ b/drivers/media/platform/mediatek/vcodec/mtk_vcodec_dbgfs.c
> > @@ -20,6 +20,8 @@ void mtk_vcodec_dbgfs_init(struct mtk_vcodec_dev
> > *vcodec_dev)
> >                       IS_ERR(vcodec_dev->dbgfs.vcodec_root));
> > 
> >       vcodec_root = vcodec_dev->dbgfs.vcodec_root;
> > +     debugfs_create_x32("mtk_v4l2_dbg_level", 0644, vcodec_root,
> > &mtk_v4l2_dbg_level);
> > +     debugfs_create_x32("mtk_vcodec_dbg", 0644, vcodec_root,
> > &mtk_vcodec_dbg);
> >   }
> >   EXPORT_SYMBOL_GPL(mtk_vcodec_dbgfs_init);
> > 
> > diff --git
> > a/drivers/media/platform/mediatek/vcodec/mtk_vcodec_util.c
> > b/drivers/media/platform/mediatek/vcodec/mtk_vcodec_util.c
> > index ace78c4b5b9e..f214e6f67005 100644
> > --- a/drivers/media/platform/mediatek/vcodec/mtk_vcodec_util.c
> > +++ b/drivers/media/platform/mediatek/vcodec/mtk_vcodec_util.c
> > @@ -13,6 +13,14 @@
> >   #include "mtk_vcodec_drv.h"
> >   #include "mtk_vcodec_util.h"
> > 
> > +#if defined(CONFIG_DEBUG_FS)
> > +int mtk_vcodec_dbg;
> > +EXPORT_SYMBOL(mtk_vcodec_dbg);
> > +
> > +int mtk_v4l2_dbg_level;
> > +EXPORT_SYMBOL(mtk_v4l2_dbg_level);
> > +#endif
> > +
> >   void __iomem *mtk_vcodec_get_reg_addr(struct mtk_vcodec_ctx
> > *data,
> >                                       unsigned int reg_idx)
> >   {
> > diff --git
> > a/drivers/media/platform/mediatek/vcodec/mtk_vcodec_util.h
> > b/drivers/media/platform/mediatek/vcodec/mtk_vcodec_util.h
> > index 71956627a0e2..938f03cab3c9 100644
> > --- a/drivers/media/platform/mediatek/vcodec/mtk_vcodec_util.h
> > +++ b/drivers/media/platform/mediatek/vcodec/mtk_vcodec_util.h
> > @@ -35,15 +35,34 @@ struct mtk_vcodec_dev;
> >       pr_err("[MTK_VCODEC][ERROR][%d]: " fmt "\n",            \
> >              ((struct mtk_vcodec_ctx *)(h)->ctx)->id, ##args)
> > 
> > +#if defined(CONFIG_DEBUG_FS)
> > +extern int mtk_v4l2_dbg_level;
> > +extern int mtk_vcodec_dbg;
> > 
> > -#define mtk_v4l2_debug(level, fmt, args...) pr_debug(fmt, ##args)
> > +#define mtk_v4l2_debug(level, fmt,
> > args...)                           \
> > +     do
> > {                                                             \
> > +             if (mtk_v4l2_dbg_level >=
> > level)                         \
> > +                     pr_info("[MTK_V4L2] level=%d %s(),%d: " fmt
> > "\n", \
> 
> These shall still be *debug* and not *info*, even if you're
> controlling the
> log level from debugfs, as these are anyway debugging prints which
> can be
> automatically optimized out for a kernel build with *no debug at
> all*.
> 
I can change it from *info* to *debug*.
> The loglevel control is a commodity that should be meant to avoid too
> much
> spam for readability and/or selectively enable "components" logging,
> because
> then there's also the tracing framework providing maximum verbosity.
> 
I can't understand here very well. Whether you mean that just need to
print useful debug information, no need to add so many prefix
"[MTK_V4L2] level=%d %s(),"? 

> Besides, I'd be happy if this finally becomes dev_dbg instead of
> pr_debug.
> 
Need to change so many log to use dev_dbg, pr_debug should be also ok.
Maybe I can change it with dev_dbg in the future.
> Regards,
> Angelo
> 
Best Regards,
Yunfei Dong
>