linux-kernel - RE: 回复: [PATCH] ACPI: APEI: move edac_init ahead of ghes platform drv register

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Message-ID: <DBBPR08MB453870FA5C5D26AADFDF05C7F7629@DBBPR08MB4538.eurprd08.prod.outlook.com>
Date:   Tue, 9 Aug 2022 16:51:45 +0000
From:   Justin He <Justin.He@....com>
To:     Borislav Petkov <bp@...en8.de>
CC:     "Kani, Toshi" <toshi.kani@....com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Len Brown <lenb@...nel.org>, James Morse <James.Morse@....com>,
        Tony Luck <tony.luck@...el.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Robert Richter <rric@...nel.org>,
        Shuai Xue <xueshuai@...ux.alibaba.com>,
        Jarkko Sakkinen <jarkko@...nel.org>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "open list:EDAC-CORE" <linux-edac@...r.kernel.org>
Subject: RE: 回复: [PATCH] ACPI: APEI: move edac_init ahead of ghes platform drv register

Hi Borislav

> -----Original Message-----
> From: Borislav Petkov <bp@...en8.de>
> Sent: Tuesday, August 9, 2022 7:16 PM
> To: Justin He <Justin.He@....com>
> Cc: Kani, Toshi <toshi.kani@....com>; Rafael J. Wysocki <rafael@...nel.org>;
> Len Brown <lenb@...nel.org>; James Morse <James.Morse@....com>; Tony
> Luck <tony.luck@...el.com>; Mauro Carvalho Chehab <mchehab@...nel.org>;
> Robert Richter <rric@...nel.org>; Shuai Xue <xueshuai@...ux.alibaba.com>;
> Jarkko Sakkinen <jarkko@...nel.org>; ACPI Devel Maling List
> <linux-acpi@...r.kernel.org>; Linux Kernel Mailing List
> <linux-kernel@...r.kernel.org>; open list:EDAC-CORE
> <linux-edac@...r.kernel.org>
> Subject: Re: 回复: [PATCH] ACPI: APEI: move edac_init ahead of ghes platform
> drv register
>
> On Tue, Aug 09, 2022 at 09:24:33AM +0000, Justin He wrote:
> > If no, what is the detail logic of ghes_edac_driver_is_preferred()?
>
> That should be moved from ghes_edac.c to ghes.c:
>
> /*
>  * Known systems that are safe to enable this module.
>  */
> static struct acpi_platform_list plat_list[] = {
>         {"HPE   ", "Server  ", 0, ACPI_SIG_FADT, all_versions},
>         { } /* End */
> };
>
> and then
>
> bool ghes_edac_driver_is_preferred()
> {
>       if (IS_ENABLED(CONFIG_X86)) {
>                 /* Check if safe to enable on this system */
>                 idx = acpi_match_platform_list(plat_list);
>       } else if (ARM) {
>               /* insert ARM logic here */
>       }
> }
>
> That function should be called by the EDAC modules which compete with
> ghes_edac.
>
> In the x86 case, that's sb_edac, skx_edac and amd64_edac, I guess.

Ok, thanks a lot for elaborating it more.
Let me summarize it before sending v2 (maybe tomorrow):
1. implement a ghes_edac_driver_is_preferred() to replace the old ghes_edac_register()
and move it to ghes.c together with plat_list
2. save the ghes and dev to a global structure and pass it to the new module_init
3.move the remain logic of old ghes_edac_register() to a new XX_init() which is under the
module_init path.
4. introduce a stub ghes_edac_driver_is_preferred() for sb_edac, skx_edac and amd64_edac
to check.
5. add the check condition in the XXX_init of sb_edac, skx_edac and amd64_edac

Please let me know if I missed anything above.


--
Cheers,
Justin (Jia He)


>
> It all depends on what platforms Toshi wants to load it - I'm guessing HPE has
> both Intel and AMD platforms where they prefer ghes_edac.
>
> On ARM, that's up to ARM folks.
>
> > Because I notice that lots of other edac drivers are probing like:
> > ...
> >         owner = edac_get_owner();
> >         if (owner && strncmp(owner, EDAC_MOD_STR,
> sizeof(EDAC_MOD_STR)))
> >                 return -EBUSY;
>
> No, that's a silly mechanism to allow a single EDAC driver to load on the
> system. But your test will go before it, at the very beginning of the init
> function.
>
> HTH.
>
> --
> Regards/Gruss,
>     Boris.
>
> https://people.kernel.org/tglx/notes-about-netiquette
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