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From: Neal Liu <neal.liu@mediatek.com>
To: Chun-Kuang Hu <chunkuang.hu@kernel.org>
Cc: devicetree@vger.kernel.org,
	wsd_upstream <wsd_upstream@mediatek.com>,
	lkml <linux-kernel@vger.kernel.org>,
	Rob Herring <robh+dt@kernel.org>,
	Neal Liu <neal.liu@mediatek.com>,
	Matthias Brugger <matthias.bgg@gmail.com>,
	"moderated list:ARM/Mediatek SoC support"
	<linux-mediatek@lists.infradead.org>,
	Linux ARM <linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH v4 2/2] soc: mediatek: add mtk-devapc driver
Date: Mon, 3 Aug 2020 12:01:35 +0800
Message-ID: <1596427295.22971.20.camel@mtkswgap22> (raw)
In-Reply-To: <CAAOTY_8aw=6E7bMJwz5jDLXUxYHpy9_Avbwc90osQGckzANNcg@mail.gmail.com>

Hi Chun-Kuang,

On Sat, 2020-08-01 at 08:12 +0800, Chun-Kuang Hu wrote:
> Hi, Neal:
> 
> This patch is for "mediatek,mt6779-devapc", so I think commit title
> should show the SoC ID.

Okay, I'll change title to 'soc:mediatek: add mt6779 devapc driver'.

> 
> Neal Liu <neal.liu@mediatek.com> 於 2020年7月29日 週三 下午4:29寫道:
> >
> > MediaTek bus fabric provides TrustZone security support and data
> > protection to prevent slaves from being accessed by unexpected
> > masters.
> > The security violation is logged and sent to the processor for
> > further analysis or countermeasures.
> >
> > Any occurrence of security violation would raise an interrupt, and
> > it will be handled by mtk-devapc driver. The violation
> > information is printed in order to find the murderer.
> >
> > Signed-off-by: Neal Liu <neal.liu@mediatek.com>
> > ---
> 
> [snip]
> 
> > +
> > +struct mtk_devapc_context {
> > +       struct device *dev;
> > +       u32 vio_idx_num;
> > +       void __iomem *devapc_pd_base;
> > +       struct mtk_devapc_vio_info *vio_info;
> > +       const struct mtk_devapc_pd_offset *offset;
> > +       const struct mtk_devapc_vio_dbgs *vio_dbgs;
> > +};
> 
> I think this structure should separate the constant part. The constant part is:
> 
> struct mtk_devapc_data {
>     const u32 vio_idx_num;
>     const struct mtk_devapc_pd_offset *offset; /* I would like to
> remove struct mtk_devapc_pd_offset and directly put its member into
> this structure */
>     const struct mtk_devapc_vio_dbgs *vio_dbgs; /* This may disappear */
> };
> 
> And the context is:
> 
> struct mtk_devapc_context {
>     struct device *dev;
>     void __iomem *devapc_pd_base;
>     const struct mtk_devapc_data *data;
> };
> 
> So when you define this, you would not waste memory to store non-constant data.
> 
> static const struct mtk_devapc_data devapc_mt6779 = {
>  .vio_idx_num = 510,
>  .offset = &mt6779_pd_offset,
>  .vio_dbgs = &mt6779_vio_dbgs,
> };
> 

Sorry, I still don't understand why this refactoring will not waste
memory to store non-constant data. Could you explain more details?
To my understanding, we still also have to allocate memory to store dev
& devapc_pd_base.

> Regards,
> Chun-Kuang.
> 
> > +
> > +#endif /* __MTK_DEVAPC_H__ */
> > --
> > 1.7.9.5
> > _______________________________________________
> > Linux-mediatek mailing list
> > Linux-mediatek@lists.infradead.org
> > http://lists.infradead.org/mailman/listinfo/linux-mediatek

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Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-29  8:18 [PATCH v4] Add MediaTek MT6779 devapc driver Neal Liu
2020-07-29  8:18 ` [PATCH v4 1/2] dt-bindings: devapc: add bindings for mtk-devapc Neal Liu
2020-07-29  8:18 ` [PATCH v4 2/2] soc: mediatek: add mtk-devapc driver Neal Liu
2020-07-29 16:38   ` Chun-Kuang Hu
2020-07-31  2:44     ` Neal Liu
2020-07-31 15:03       ` Chun-Kuang Hu
2020-08-03  3:32         ` Neal Liu
2020-08-03 16:13           ` Chun-Kuang Hu
2020-08-04  2:18             ` Neal Liu
2020-08-04 15:27               ` Chun-Kuang Hu
2020-07-29 22:47   ` Chun-Kuang Hu
2020-07-31  2:47     ` Neal Liu
2020-07-30 16:14   ` Chun-Kuang Hu
2020-07-31  2:52     ` Neal Liu
2020-07-31 15:55       ` Chun-Kuang Hu
2020-08-03  3:41         ` Neal Liu
2020-08-01  0:12   ` Chun-Kuang Hu
2020-08-03  4:01     ` Neal Liu [this message]
2020-08-03 16:04       ` Chun-Kuang Hu
2020-08-04  2:08         ` Neal Liu
2020-08-04 15:55           ` Chun-Kuang Hu
2020-08-01 23:50   ` Chun-Kuang Hu
2020-08-03  4:05     ` Neal Liu
2020-08-03 15:38       ` Chun-Kuang Hu

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