Re: [PATCH] PCI: Add function 1 DMA alias quirk for Toshiba AHCI SSD controller

[sashiko-bot@kernel.org]

> The Toshiba AHCI SATA controller [1179:010b] (subsystem [1b4b:9183])
> used in 11-inch MacBook Air models (MacBookAir6,1 and MacBookAir7,1)
> issues DMA with the requester ID of function 1, which does not exist.
> With the Intel IOMMU enabled (intel_iommu=on, or
> CONFIG_INTEL_IOMMU_DEFAULT_ON=y), these DMA writes are blocked, IDENTIFY
> fails and the internal disk never appears:
> 
>   DMAR: [DMA Write NO_PASID] Request device [0000:04:00.1] fault addr 0xfffe0000 [fault reason 0x02] Present bit in context entry is clear
>   ata1.00: failed to IDENTIFY (INIT_DEV_PARAMS failed, err_mask=0x80)
> 
> Add the controller to the quirk_dma_func1_alias() list. With it, the
> SSD is identified and the system boots with the IOMMU enabled.
> 
> Link: https://github.com/omacom/omarchy/issues/12097
> Link: https://github.com/omacom/omarchy/issues/13010
> Cc: stable@vger.kernel.org
> Assisted-by: Claude Opus 5.5
> Signed-off-by: Michael Stolovitzsky <emestee@catnarok.net>

Sashiko has reviewed this patch and found no issues. It looks great!

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