[PATCH rc v1 4/4] iommu/arm-smmu-v3: Detect ARM_SMMU_OPT_KDUMP in arm_smmu_device_hw_probe()

[Tian, Kevin]

> From: Nicolin Chen <nicolinc at nvidia.com>
> Sent: Friday, April 10, 2026 3:47 AM
> +
> +	/*
> +	 * If SMMU is already active in kdump case, there could be in-flight
> DMA
> +	 * from devices initiated by the crashed kernel. Mark
> ARM_SMMU_OPT_KDUMP
> +	 * to let the init functions adopt the crashed kernel's stream table.
> +	 *
> +	 * Note that arm_smmu_adopt_strtab() uses memremap that can
> only work on
> +	 * a coherent SMMU. A non-coherent SMMU has no choice but to
> continue to
> +	 * abort any in-flight DMA.
> +	 */
> +	if (is_kdump_kernel() && coherent &&
> +	    (readl_relaxed(smmu->base + ARM_SMMU_CR0) &
> CR0_SMMUEN))
> +		smmu->options |= ARM_SMMU_OPT_KDUMP;
> +
>  	return 0;

A warning message for the non-coherent case?