linux-kernel - Re: [PATCH 1/3] iommu/vt-d: Add new enum value and structure for SATC

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Date:   Tue, 2 Feb 2021 08:02:03 -0800
From:   "Raj, Ashok" <ashok.raj@...el.com>
To:     Lu Baolu <baolu.lu@...ux.intel.com>
Cc:     iommu@...ts.linux-foundation.org, Yian Chen <yian.chen@...el.com>,
        Joerg Roedel <joro@...tes.org>, linux-kernel@...r.kernel.org,
        Ashok Raj <ashok.raj@...el.com>
Subject: Re: [PATCH 1/3] iommu/vt-d: Add new enum value and structure for SATC

On Tue, Feb 02, 2021 at 12:40:55PM +0800, Lu Baolu wrote:
> From: Yian Chen <yian.chen@...el.com>
> 
> Starting from Intel Platform VT-d v3.2, BIOS may provide new remapping
> structure SATC for SOC integrated devices, according to section 8.8 of
> Intel VT-d architecture specification v3.2. The SATC structure reports
> a list of the devices that require SATC enabling via ATS capacity.

nit: s/require SATC/require ATS for normal device operation. This is a
functional requirement that these devices will not work without OS enabling
ATS capability.

> 
> This patch introduces the new enum value and structure to represent the
> remapping information. Kernel should parse the information from the
> reporting structure and enable ATC for the devices as needed.
> 
> Signed-off-by: Yian Chen <yian.chen@...el.com>
> ---
>  include/acpi/actbl1.h | 11 ++++++++++-
>  1 file changed, 10 insertions(+), 1 deletion(-)
> 
> diff --git a/include/acpi/actbl1.h b/include/acpi/actbl1.h
> index 43549547ed3e..b7ca802b66d2 100644
> --- a/include/acpi/actbl1.h
> +++ b/include/acpi/actbl1.h
> @@ -514,7 +514,8 @@ enum acpi_dmar_type {
>  	ACPI_DMAR_TYPE_ROOT_ATS = 2,
>  	ACPI_DMAR_TYPE_HARDWARE_AFFINITY = 3,
>  	ACPI_DMAR_TYPE_NAMESPACE = 4,
> -	ACPI_DMAR_TYPE_RESERVED = 5	/* 5 and greater are reserved */
> +	ACPI_DMAR_TYPE_SATC = 5,
> +	ACPI_DMAR_TYPE_RESERVED = 6	/* 5 and greater are reserved */
>  };
>  

Think Joerg spotted the comment update.