linux-kernel - Re: [RFC PATCH 2/6] iommu/amd: Add support for hw

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Date: Fri, 5 Jan 2024 20:40:06 +0700
From: "Suthikulpanit, Suravee" <suravee.suthikulpanit@....com>
To: "Tian, Kevin" <kevin.tian@...el.com>,
 "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
 "iommu@...ts.linux.dev" <iommu@...ts.linux.dev>,
 "joro@...tes.org" <joro@...tes.org>, "jgg@...dia.com" <jgg@...dia.com>
Cc: "Liu, Yi L" <yi.l.liu@...el.com>,
 "nicolinc@...dia.com" <nicolinc@...dia.com>,
 "eric.auger@...hat.com" <eric.auger@...hat.com>,
 "vasant.hegde@....com" <vasant.hegde@....com>,
 "jon.grimm@....com" <jon.grimm@....com>,
 "santosh.shukla@....com" <santosh.shukla@....com>,
 "Dhaval.Giani@....com" <Dhaval.Giani@....com>,
 "pandoh@...gle.com" <pandoh@...gle.com>,
 "loganodell@...gle.com" <loganodell@...gle.com>
Subject: Re: [RFC PATCH 2/6] iommu/amd: Add support for hw_info for iommu
 capability query

Hi Kevin,

On 12/15/2023 2:32 PM, Tian, Kevin wrote:
>> From: Suravee Suthikulpanit <suravee.suthikulpanit@....com>
>> Sent: Wednesday, December 13, 2023 12:02 AM
>>
>> +void amd_iommu_build_efr(u64 *efr, u64 *efr2)
>> +{
>> +	if (efr) {
>> +		*efr = (FEATURE_GT | FEATURE_GIOSUP | FEATURE_PPR);
>> +
>> +		/* 5-level v2 page table support */
>> +		*efr |= ((FEATURE_GATS_5LEVEL << FEATURE_GATS_SHIFT) &
>> +			 FEATURE_GATS_MASK);
>> +
>> +		/* 3-level GCR3 table support */
>> +		*efr |= ((FEATURE_GLX_3LEVEL << FEATURE_GLX_SHIFT) &
>> +			 FEATURE_GLX_MASK);
>> +
>> +		/* 16-bit PASMAX support */
>> +		*efr |= ((FEATURE_PASMAX_16 << FEATURE_PASMAX_SHIFT)
>> &
>> +			 FEATURE_PASMAX_MASK);
>> +	}
>> +
>> +	if (efr2)
>> +		*efr2 = 0;
>> +}
> 
> Don't this need to check the support in hw?

Ah.. Good point. Let me add check for the support for these features in 
the actual hardware.

Thanks,
Suravee