Re: [PATCH v5 6/6] iommu/arm-smmu-v3: Detect ARM_SMMU_OPT_KDUMP_ADOPT in probe()

[Jason Gunthorpe]

On Sun, May 10, 2026 at 02:23:05PM -0700, Nicolin Chen wrote:
> arm_smmu_device_hw_probe() runs before arm_smmu_init_structures(), so it's
> natural to decide whether the kdump kernel must adopt the crashed kernel's
> stream table.
> 
> Given that memremap is used to adopt the old stream table, set this option
> only on a coherent SMMU.
> 
> And make sure SMMU isn't in Service Failure Mode.
> 
> Fixes: b63b3439b856 ("iommu/arm-smmu-v3: Abort all transactions if SMMU is enabled in kdump kernel")
> Cc: stable@xxxxxxxxxxxxxxx # v6.12+
> Reviewed-by: Kevin Tian <kevin.tian@xxxxxxxxx>
> Signed-off-by: Nicolin Chen <nicolinc@xxxxxxxxxx>
> ---
>  drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 31 +++++++++++++++++++++
>  1 file changed, 31 insertions(+)

Reviewed-by: Jason Gunthorpe <jgg@xxxxxxxxxx>

Jason