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

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Date:   Wed, 3 Feb 2021 08:15:16 +0800
From:   Lu Baolu <baolu.lu@...ux.intel.com>
To:     "Raj, Ashok" <ashok.raj@...el.com>
Cc:     baolu.lu@...ux.intel.com, iommu@...ts.linux-foundation.org,
        Yian Chen <yian.chen@...el.com>,
        Joerg Roedel <joro@...tes.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] iommu/vt-d: Add new enum value and structure for SATC

Hi Ashok,

On 2/3/21 12:02 AM, Raj, Ashok wrote:
> 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.
> 

Yes. This looks clearer.

Best regards,
baolu

>>
>> 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.
>