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

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Date:   Tue, 9 Aug 2022 14:36:33 +0000
From:   "Kani, Toshi" <toshi.kani@....com>
To:     Borislav Petkov <bp@...en8.de>, Justin He <Justin.He@....com>
CC:     "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 Tuesday, August 9, 2022 5:16 AM, Borislav Petkov wrote:
> 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.

The logic needs to be latched on ghes presence, i.e., the condition is
(ghes-present) && (ghes-preferred).  Currently, ghes_probe() calls
ghes_edac_register() for this.

> In the x86 case, that's sb_edac, skx_edac and amd64_edac, I guess.

Agree that changing all edac drivers to check with GHES is an option.
In this approach, though, they will need to check with foo_preferred()
when a new FW interface FOO is introduced.
 
> 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.

Yes, and HPE will keep the same platform ID for GHES/FF model.

> 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.

Well, this check being interface independent (like GHES) is good at least.

Toshi