[PATCH 3/5] iommu/dart: Set DMA domain for locked DARTs
Robin Murphy
robin.murphy at arm.com
Tue Feb 11 10:25:35 PST 2025
On 2025-02-10 7:39 pm, Alyssa Rosenzweig wrote:
> This is required.
Now that we can, I'd really rather do this properly and not offer an
identity domain in the first place when it's not available.
Thanks,
Robin.
> Signed-off-by: Alyssa Rosenzweig <alyssa at rosenzweig.io>
> ---
> drivers/iommu/apple-dart.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/drivers/iommu/apple-dart.c b/drivers/iommu/apple-dart.c
> index 9c74a95eb7e819e94ab2fb47ed0d411a1eba8bf7..9c6f780dc7220096ed6bba692fa1a4bd859b0d61 100644
> --- a/drivers/iommu/apple-dart.c
> +++ b/drivers/iommu/apple-dart.c
> @@ -941,6 +941,8 @@ static int apple_dart_def_domain_type(struct device *dev)
> return IOMMU_DOMAIN_IDENTITY;
> if (!cfg->stream_maps[0].dart->supports_bypass)
> return IOMMU_DOMAIN_DMA;
> + if (cfg->stream_maps[0].dart->locked)
> + return IOMMU_DOMAIN_DMA;
>
> return 0;
> }
>
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