linux-kernel - Re: [Patch V1 3/4] memory: tegra: add mc-err support for T186

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Date:   Wed, 19 Jan 2022 14:28:49 +0530
From:   Ashish Mhetre <amhetre@...dia.com>
To:     Dmitry Osipenko <digetx@...il.com>, <thierry.reding@...il.com>,
        <jonathanh@...dia.com>, <linux-tegra@...r.kernel.org>,
        <krzysztof.kozlowski@...onical.com>, <linux-kernel@...r.kernel.org>
CC:     <Snikam@...dia.com>, <vdumpa@...dia.com>
Subject: Re: [Patch V1 3/4] memory: tegra: add mc-err support for T186



On 1/12/2022 4:32 PM, Dmitry Osipenko wrote:
> External email: Use caution opening links or attachments
> 
> 
> 11.01.2022 21:45, Ashish Mhetre пишет:
>> +static const struct tegra_mc_error int_mc_errors[] = {
>> +     {
>> +             .int_bit = MC_INT_DECERR_EMEM,
>> +             .msg = "EMEM address decode error",
>> +             .status_reg = MC_ERR_STATUS,
>> +             .addr_reg = MC_ERR_ADR,
>> +     },
>> +     {
>> +             .int_bit = MC_INT_SECURITY_VIOLATION,
>> +             .msg = "non secure access to secure region",
>> +             .status_reg = MC_ERR_STATUS,
>> +             .addr_reg = MC_ERR_ADR,
>> +     },
>> +     {
>> +             .int_bit = MC_INT_DECERR_VPR,
>> +             .msg = "MC request violates VPR requirements",
>> +             .status_reg = MC_ERR_VPR_STATUS,
>> +             .addr_reg = MC_ERR_VPR_ADR,
>> +     },
>> +     {
>> +             .int_bit = MC_INT_SECERR_SEC,
>> +             .msg = "MC request violated SEC carveout requirements",
>> +             .status_reg = MC_ERR_SEC_STATUS,
>> +             .addr_reg = MC_ERR_SEC_ADR,
>> +     },
>> +     {
>> +             .int_bit = MC_INT_DECERR_MTS,
>> +             .msg = "MTS carveout access violation",
>> +             .status_reg = MC_ERR_MTS_STATUS,
>> +             .addr_reg = MC_ERR_MTS_ADR,
>> +     },
>> +     {
>> +             .int_bit = MC_INT_DECERR_GENERALIZED_CARVEOUT,
>> +             .msg = "GSC access violation",
>> +             .status_reg = MC_ERR_GENERALIZED_CARVEOUT_STATUS,
>> +             .addr_reg = MC_ERR_GENERALIZED_CARVEOUT_ADR,
>> +     },
>> +};
>> +
>> +static irqreturn_t tegra186_mc_handle_irq(int irq, void *data)
>> +{
>> +     struct tegra_mc *mc = data;
>> +     unsigned long status;
>> +     unsigned int bit;
>> +
>> +     status = mc_readl(mc, MC_INTSTATUS) & mc->soc->intmask;
>> +     if (!status)
>> +             return IRQ_NONE;
>> +
>> +     for_each_set_bit(bit, &status, 32) {
>> +             const char *error = int_mc_errors[bit].msg ?: "unknown";
> 
> int_mc_errors[bit] isn't what you need and .int_bit is unused, which
> suggests that all this code doesn't work and was untested. Please don't
> send untested patches.
Yes, my bad. I will update this in next patch.
Actually I made sure that the patches build without errors and also made
sure that they does not break anything. As for reproducing each of these
memory controller errors, I agree that I haven't done that.