回复: [PATCH] ACPI: APEI: move edac_init ahead of ghes platform drv register

[Justin He]

> -----邮件原件-----
> 发件人: Borislav Petkov <bp@xxxxxxxxx>
> 发送时间: Tuesday, August 9, 2022 3:41 PM
> 收件人: Kani, Toshi <toshi.kani@xxxxxxx>
> 抄送: Rafael J. Wysocki <rafael@xxxxxxxxxx>; Justin He
> <Justin.He@xxxxxxx>; Len Brown <lenb@xxxxxxxxxx>; James Morse
> <James.Morse@xxxxxxx>; Tony Luck <tony.luck@xxxxxxxxx>; Mauro
> Carvalho Chehab <mchehab@xxxxxxxxxx>; Robert Richter <rric@xxxxxxxxxx>;
> Shuai Xue <xueshuai@xxxxxxxxxxxxxxxxx>; Jarkko Sakkinen
> <jarkko@xxxxxxxxxx>; ACPI Devel Maling List <linux-acpi@xxxxxxxxxxxxxxx>;
> Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>; open
> list:EDAC-CORE <linux-edac@xxxxxxxxxxxxxxx>
> 主题: Re: [PATCH] ACPI: APEI: move edac_init ahead of ghes platform drv
> register
>
> On Mon, Aug 08, 2022 at 09:36:13PM +0000, Kani, Toshi wrote:
> > Platforms with ACPI GHES support should use ghes_edac. This is the
> > case on Arm. The x86 side has additional platform ID check to protect
> > from legacy buggy GHES FW existed before ghes_edac enablement.
>
> Sounds to me like we should put all that logic in ghes.c and out of ghes_edac
> and the EDAC drivers will query it by doing upon load:
>
> <edac_driver>_init:
>
>       if (ghes_edac_driver_is_preferred())
>               return -ENODEV;
>
Do you mean the similar logic as what Kani Toshi suggested?
e.g.
bool ghes_edac_driver_is_preferred()
{
        If (mod_name is "ghes_edac")
                return true;

        return false;
}
If no, what is the detail logic of ghes_edac_driver_is_preferred()?
Thanks for the clarification 😊
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;
...

> And then ghes_edac can become a normal driver module again.
>

--
Cheers,
Justin (Jia He)
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