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

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Date: Tue, 12 Mar 2024 19:14:45 +0100
From: Konrad Dybcio <konrad.dybcio@...aro.org>
To: Georgi Djakov <quic_c_gdjako@...cinc.com>, robh+dt@...nel.org,
 krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org, will@...nel.org,
 robin.murphy@....com, joro@...tes.org, iommu@...ts.linux.dev
Cc: devicetree@...r.kernel.org, andersson@...nel.org, robdclark@...il.com,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
 linux-arm-msm@...r.kernel.org, quic_cgoldswo@...cinc.com,
 quic_sukadev@...cinc.com, quic_pdaly@...cinc.com, quic_sudaraja@...cinc.com,
 djakov@...nel.org
Subject: Re: [PATCH v6 4/7] iommu/arm-smmu-qcom: Use a custom context fault
 handler for sdm845



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@...cinc.com>
> ---

[...]

> 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