linux-kernel - Re: [PATCH v2 1/1] iommu/vt-d: Remove INTEL_IOMMU_BROKEN_GFX

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Date: Tue, 30 Jan 2024 14:39:04 +0800
From: Baolu Lu <baolu.lu@...ux.intel.com>
To: "Tian, Kevin" <kevin.tian@...el.com>, Joerg Roedel <joro@...tes.org>,
 Will Deacon <will@...nel.org>, Robin Murphy <robin.murphy@....com>,
 Jason Gunthorpe <jgg@...pe.ca>
Cc: baolu.lu@...ux.intel.com, Jani Nikula <jani.nikula@...ux.intel.com>,
 Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
 "Vivi, Rodrigo" <rodrigo.vivi@...el.com>,
 Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>,
 "iommu@...ts.linux.dev" <iommu@...ts.linux.dev>,
 "intel-gfx@...ts.freedesktop.org" <intel-gfx@...ts.freedesktop.org>,
 "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 1/1] iommu/vt-d: Remove INTEL_IOMMU_BROKEN_GFX_WA

On 2024/1/30 14:24, Tian, Kevin wrote:
>> From: Lu Baolu <baolu.lu@...ux.intel.com>
>> Sent: Tuesday, January 30, 2024 2:08 PM
>>
>> Commit 62edf5dc4a524 ("intel-iommu: Restore DMAR_BROKEN_GFX_WA
>> option for
>> broken graphics drivers") was introduced 24 years ago as a temporary
>> workaround for graphics drivers that used physical addresses for DMA and
>> avoided DMA APIs. This workaround was disabled by default.
>>
>> As 24 years have passed, it is expected that graphics driver developers
>> have migrated their drivers to use kernel DMA APIs. Therefore, this
>> workaround is no longer required and could been removed.
>>
>> The Intel iommu driver also provides a "igfx_off" option to turn off
>> the DAM translation for the graphic dedicated IOMMU. Hence, there is
>> really no good reason to keep this config option.
>>
> 
> s/DAM/DMA/

Fixed. :-)

Best regards,
baolu