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Date:   Wed, 18 Oct 2023 16:05:54 -0700
From:   Jerry Snitselaar <>
To:     Robin Murphy <>
Subject: Re: [PATCH v5 2/7] iommu: Decouple iommu_present() from bus ops

On Wed, Oct 11, 2023 at 07:14:49PM +0100, Robin Murphy wrote:
> Much as I'd like to remove iommu_present(), the final remaining users
> are proving stubbornly difficult to clean up, so kick that can down the
> road and just rework it to preserve the current behaviour without
> depending on bus ops. Since commit 57365a04c921 ("iommu: Move bus setup
> to IOMMU device registration"), any registered IOMMU instance is already
> considered "present" for every entry in iommu_buses, so it's simply a
> case of validating the bus and checking we have at least once IOMMU.
> Reviewed-by: Jason Gunthorpe <>
> Signed-off-by: Robin Murphy <>
> ---
> v3: Tweak to use the ops-based check rather than group-based, to
>     properly match the existing behaviour
> v4: Just look for IOMMU instances instead of managed devices
> ---

Reviewed-by: Jerry Snitselaar <>

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