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

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Date: Mon, 26 Feb 2024 14:07:28 +0800
From: Baolu Lu <baolu.lu@...ux.intel.com>
To: Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
 Robin Murphy <robin.murphy@....com>, Jason Gunthorpe <jgg@...pe.ca>,
 Kevin Tian <kevin.tian@...el.com>
Cc: baolu.lu@...ux.intel.com, Jani Nikula <jani.nikula@...ux.intel.com>,
 Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
 Rodrigo Vivi <rodrigo.vivi@...el.com>,
 Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>, iommu@...ts.linux.dev,
 intel-gfx@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/1] iommu/vt-d: Remove INTEL_IOMMU_BROKEN_GFX_WA

On 1/30/24 2:08 PM, Lu Baolu wrote:
> 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.
> 
> Suggested-by: Kevin Tian<kevin.tian@...el.com>
> Signed-off-by: Lu Baolu<baolu.lu@...ux.intel.com>
> Reviewed-by: Kevin Tian<kevin.tian@...el.com>
> ---
>   drivers/iommu/intel/iommu.c |  4 ----
>   drivers/iommu/intel/Kconfig | 11 -----------
>   2 files changed, 15 deletions(-)

I have queued this patch for v6.9.

Best regards,
baolu