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

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Date:   Tue, 22 Aug 2017 14:04:27 +0000
From:   "Ghannam, Yazen" <Yazen.Ghannam@....com>
To:     "linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>
CC:     "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>, Tony Luck <tony.luck@...el.com>
Subject: RE: [PATCH] ACPI, APEI, EINJ: Subtract any matching Register Region
 from Trigger resources

+EDAC, Boris and Tony for RAS comments.

Any comments from ACPI folks?

Thanks,
Yazen

> -----Original Message-----
> From: Ghannam, Yazen
> Sent: Thursday, August 10, 2017 1:58 PM
> To: linux-acpi@...r.kernel.org
> Cc: linux-kernel@...r.kernel.org; rjw@...ysocki.net; lenb@...nel.org;
> Ghannam, Yazen <Yazen.Ghannam@....com>
> Subject: [PATCH] ACPI, APEI, EINJ: Subtract any matching Register Region from
> Trigger resources
> 
> From: Yazen Ghannam <yazen.ghannam@....com>
> 
> ACPI defines a number of instructions to use for triggering errors. However
> we are currently removing the address resources from the trigger resources
> for only the WRITE_REGISTER_VALUE instruction. This leads to a resource
> conflict for any other valid instruction.
> 
> Remove the WRITE_REGISTER_VALUE instruction check to fix the resource
> conflict with other instructions.
> 
> Fixes: b4e008dc53a3 ("ACPI, APEI, EINJ, Refine the fix of resource conflict")
> Signed-off-by: Yazen Ghannam <yazen.ghannam@....com>
> ---
>  drivers/acpi/apei/einj.c | 1 -
>  1 file changed, 1 deletion(-)
> 
> diff --git a/drivers/acpi/apei/einj.c b/drivers/acpi/apei/einj.c
> index ec50c32ea3da..e0f201ea161d 100644
> --- a/drivers/acpi/apei/einj.c
> +++ b/drivers/acpi/apei/einj.c
> @@ -281,7 +281,6 @@ static struct acpi_generic_address
> *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))
> --
> 2.7.4