Re: [PATCH v6 7/8] dma: swiotlb: Add an overridable architecture pool opt-out

[sashiko-bot@kernel.org]

> On x86, iommu=off historically prevented SWIOTLB initialization by not
> setting SWIOTLB_INIT_ADDRESSING_LIMIT. This overloads that flag: it
> controls both whether a pool is selected and where the pool is
> allocated. If another requirement, swiotlb=force selects a pool
> independently, omitting SWIOTLB_INIT_ADDRESSING_LIMIT may place it above
> the addressable range of devices which need bounce buffering.
> 
> Add SWIOTLB_INIT_DEFAULT_OFF to let an architecture opt out of normal
> pool initialization without discarding the pool placement constraints.
> 
> Unlike swiotlb_force_disable, which is set by swiotlb=noforce and
> unconditionally prevents pool initialization, the new flag is an
> architecture default. Explicit requirements such as memory encryption,
> architecture remapping, or swiotlb=force take precedence over it.
> 
> [ ... ]
> Cc: x86@kernel.org
> Cc: "H. Peter Anvin" <hpa@zytor.com>
> Cc: Marek Szyprowski <m.szyprowski@samsung.com>
> Cc: Robin Murphy <robin.murphy@arm.com>
> Signed-off-by: Aneesh Kumar K.V (Arm) <aneesh.kumar@kernel.org>

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

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Sashiko AI review · https://sashiko.dev/#/patchset/20260924060756.1325156-1-aneesh.kumar@kernel.org?part=7