Re: [PATCH v6 4/7] iommu/arm-smmu-qcom: Use a custom context fault handler for sdm845

[Konrad Dybcio]

On 3/7/24 20:05, Georgi Djakov wrote:
> The sdm845 platform now supports TBUs, so let's get additional debug
> info from the TBUs when a context fault occurs. Implement a custom
> context fault handler that does both software + hardware page table
> walks and TLB Invalidate All.
>
> Signed-off-by: Georgi Djakov <quic_c_gdjako@xxxxxxxxxxx>
> ---

[...]

> diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c b/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c
> index 5c7cfc51b57c..7a58b1b96bca 100644
> --- a/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c
> +++ b/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c
> @@ -422,6 +422,10 @@ static const struct arm_smmu_impl sdm845_smmu_500_impl = {
>   	.reset = qcom_sdm845_smmu500_reset,
>   	.write_s2cr = qcom_smmu_write_s2cr,
>   	.tlb_sync = qcom_smmu_tlb_sync,
> +#ifdef CONFIG_ARM_SMMU_QCOM_TBU
> +	.context_fault = qcom_smmu_context_fault,
> +	.context_fault_needs_threaded_irq = true,
> +#endif

Is this enough for cases where CONFIG_ARM_SMMU_QCOM_TBU=y but the
dts changes aren't there? IIUC this will spam the error message in
qcom_find_tbu()

Konrad