linux-kernel - Re: [PATCH] ACPI, APEI, EINJ: Subtract any matching Register Region from Trigger resources

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Date:   Tue, 22 Aug 2017 09:03:06 -0700
From:   "Luck, Tony" <tony.luck@...el.com>
To:     "Ghannam, Yazen" <Yazen.Ghannam@....com>
Cc:     "linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "rjw@...ysocki.net" <rjw@...ysocki.net>,
        "lenb@...nel.org" <lenb@...nel.org>,
        "linux-edac@...r.kernel.org" <linux-edac@...r.kernel.org>,
        Borislav Petkov <bp@...e.de>
Subject: Re: [PATCH] ACPI, APEI, EINJ: Subtract any matching Register Region
 from Trigger resources

On Tue, Aug 22, 2017 at 02:04:27PM +0000, Ghannam, Yazen wrote:
> > *einj_get_trigger_parameter_region(
> >  		((char *)trigger_tab + sizeof(struct acpi_einj_trigger));
> >  	for (i = 0; i < trigger_tab->entry_count; i++) {
> >  		if (entry->action == ACPI_EINJ_TRIGGER_ERROR &&
> > -		entry->instruction == ACPI_EINJ_WRITE_REGISTER_VALUE &&
> >  		entry->register_region.space_id ==
> >  			ACPI_ADR_SPACE_SYSTEM_MEMORY &&
> >  		(entry->register_region.address & param2) == (param1 &
> > param2))

Maybe you should add the other instruction types that make sense
here (ACPI_EINJ_READ_REGISTER, ACPI_EINJ_READ_REGISTER_VALUE and
ACPI_EINJ_WRITE_REGISTER) as a sanity check against the BIOS
giving you an action in the trigger table that doesn't involve
a memory access?

-Tony