linux-kernel - Re: [PATCHv2] iommu/arm-smmu-qcom: Add debug support for TLB sync timeouts

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Message-ID: <21d5fc44-4870-02bb-70b4-d9e1188c9cc1@quicinc.com>
Date:   Thu, 23 Jun 2022 11:32:18 +0530
From:   Sai Prakash Ranjan <quic_saipraka@...cinc.com>
To:     Will Deacon <will@...nel.org>, Robin Murphy <robin.murphy@....com>,
        "Joerg Roedel" <joro@...tes.org>
CC:     <iommu@...ts.linux-foundation.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>,
        <quic_guptap@...cinc.com>, Rob Clark <robdclark@...omium.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>
Subject: Re: [PATCHv2] iommu/arm-smmu-qcom: Add debug support for TLB sync
 timeouts

On 5/26/2022 9:44 AM, Sai Prakash Ranjan wrote:
> TLB sync timeouts can be due to various reasons such as TBU power down
> or pending TCU/TBU invalidation/sync and so on. Debugging these often
> require dumping of some implementation defined registers to know the
> status of TBU/TCU operations and some of these registers are not
> accessible in non-secure world such as from kernel and requires SMC
> calls to read them in the secure world. So, add this debug support
> to dump implementation defined registers for TLB sync timeout issues.
>
> Signed-off-by: Sai Prakash Ranjan <quic_saipraka@...cinc.com>
> ---
>
> Changes in v2:
>   * Use scm call consistently so that it works on older chipsets where
>     some of these regs are secure registers.
>   * Add device specific data to get the implementation defined register
>     offsets.
>
> ---
>   drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c | 161 ++++++++++++++++++---
>   drivers/iommu/arm/arm-smmu/arm-smmu.c      |   2 +
>   drivers/iommu/arm/arm-smmu/arm-smmu.h      |   1 +
>   3 files changed, 146 insertions(+), 18 deletions(-)

Any comments on this patch?

Thanks,
Sai