linux-kernel - RE: [PATCH] soc: imx-scu: Add SoC UID(unique identifier) support

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Message-ID: <DB3PR0402MB3916A4093CFB363B51523AA7F5FD0@DB3PR0402MB3916.eurprd04.prod.outlook.com>
Date:   Thu, 27 Jun 2019 00:48:22 +0000
From:   Anson Huang <anson.huang@....com>
To:     Daniel Baluta <daniel.baluta@...il.com>
CC:     Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        Aisheng Dong <aisheng.dong@....com>,
        Abel Vesa <abel.vesa@....com>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        dl-linux-imx <linux-imx@....com>,
        Daniel Baluta <daniel.baluta@....com>
Subject: RE: [PATCH] soc: imx-scu: Add SoC UID(unique identifier) support

Hi, Daniel

> -----Original Message-----
> From: Daniel Baluta <daniel.baluta@...il.com>
> Sent: Wednesday, June 26, 2019 8:42 PM
> To: Anson Huang <anson.huang@....com>
> Cc: Shawn Guo <shawnguo@...nel.org>; Sascha Hauer
> <s.hauer@...gutronix.de>; Pengutronix Kernel Team
> <kernel@...gutronix.de>; Fabio Estevam <festevam@...il.com>; Aisheng
> Dong <aisheng.dong@....com>; Abel Vesa <abel.vesa@....com>; linux-
> arm-kernel <linux-arm-kernel@...ts.infradead.org>; Linux Kernel Mailing List
> <linux-kernel@...r.kernel.org>; dl-linux-imx <linux-imx@....com>; Daniel
> Baluta <daniel.baluta@....com>
> Subject: Re: [PATCH] soc: imx-scu: Add SoC UID(unique identifier) support
> 
> On Wed, Jun 26, 2019 at 10:06 AM <Anson.Huang@....com> wrote:
> >
> > From: Anson Huang <Anson.Huang@....com>
> >
> > Add i.MX SCU SoC's UID(unique identifier) support, user can read it
> > from sysfs:
> >
> > root@...8qxpmek:~# cat /sys/devices/soc0/soc_uid
> > 7B64280B57AC1898
> >
> > Signed-off-by: Anson Huang <Anson.Huang@....com>
> > ---
> >  drivers/soc/imx/soc-imx-scu.c | 35
> > +++++++++++++++++++++++++++++++++++
> >  1 file changed, 35 insertions(+)
> >
> > diff --git a/drivers/soc/imx/soc-imx-scu.c
> > b/drivers/soc/imx/soc-imx-scu.c index 676f612..8d322a1 100644
> > --- a/drivers/soc/imx/soc-imx-scu.c
> > +++ b/drivers/soc/imx/soc-imx-scu.c
> > @@ -27,6 +27,36 @@ struct imx_sc_msg_misc_get_soc_id {
> >         } data;
> >  } __packed;
> >
> > +struct imx_sc_msg_misc_get_soc_uid {
> > +       struct imx_sc_rpc_msg hdr;
> > +       u32 uid_low;
> > +       u32 uid_high;
> > +} __packed;
> > +
> > +static ssize_t soc_uid_show(struct device *dev,
> > +                           struct device_attribute *attr, char *buf)
> > +{
> > +       struct imx_sc_msg_misc_get_soc_uid msg;
> > +       struct imx_sc_rpc_msg *hdr = &msg.hdr;
> > +       u64 soc_uid;
> > +
> > +       hdr->ver = IMX_SC_RPC_VERSION;
> > +       hdr->svc = IMX_SC_RPC_SVC_MISC;
> > +       hdr->func = IMX_SC_MISC_FUNC_UNIQUE_ID;
> > +       hdr->size = 1;
> > +
> > +       /* the return value of SCU FW is in correct, skip return value
> > + check */
> 
> Why do you mean by "in correct"?

I made a mistake, it should be "incorrect", the existing SCFW of this API returns
an error value even this API is successfully called, to make it work with current
SCFW, I have to skip the return value check for this API for now. Will send V2 patch
to fix this typo.

> > +       imx_scu_call_rpc(soc_ipc_handle, &msg, true);
> > +
> > +       soc_uid = msg.uid_high;
> > +       soc_uid <<= 32;
> > +       soc_uid |= msg.uid_low;
> > +
> > +       return sprintf(buf, "%016llX\n", soc_uid);
> 
> snprintf?

The snprintf is to avoid buffer overflow, which in this case, I don't know the size
of "buf", and the value(u64) to be printed is with fixed length of 64, so I think
sprint is just OK.

Anson.
> 
> > +}
> > +
> > +static DEVICE_ATTR_RO(soc_uid);
> > +
> >  static int imx_scu_soc_id(void)
> >  {
> >         struct imx_sc_msg_misc_get_soc_id msg; @@ -102,6 +132,11 @@
> > static int imx_scu_soc_probe(struct platform_device *pdev)
> >                 goto free_revision;
> >         }
> >
> > +       ret = device_create_file(soc_device_to_device(soc_dev),
> > +                                &dev_attr_soc_uid);
> > +       if (ret)
> > +               goto free_revision;
> > +
> >         return 0;
> >
> >  free_revision:
> > --
> > 2.7.4
> >