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

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Date:   Wed, 19 Jan 2022 16:41:35 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Ashish Mhetre <amhetre@...dia.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

19.01.2022 11:53, Ashish Mhetre пишет:
> 
> 
> On 1/12/2022 4:31 PM, Dmitry Osipenko wrote:
>> External email: Use caution opening links or attachments
>>
>>
>> 11.01.2022 21:45, Ashish Mhetre пишет:
>>> Add all mc-errors supported by T186.
>>> Implement mc interrupt handling routine for T186.
>>>
>>> Signed-off-by: Ashish Mhetre <amhetre@...dia.com>
>>> ---
>>>   drivers/memory/tegra/mc.h       |  17 +++++++
>>>   drivers/memory/tegra/tegra186.c | 100
>>> ++++++++++++++++++++++++++++++++++++++++
>>>   2 files changed, 117 insertions(+)
>>>
>>> diff --git a/drivers/memory/tegra/mc.h b/drivers/memory/tegra/mc.h
>>> index 2d4f495..7817492 100644
>>> --- a/drivers/memory/tegra/mc.h
>>> +++ b/drivers/memory/tegra/mc.h
>>> @@ -44,6 +44,15 @@
>>>   #define MC_TIMING_CONTROL_DBG                                0xf8
>>>   #define MC_TIMING_CONTROL                            0xfc
>>>
>>
>> this empty line is unnecessary
>>
> I'll fix this in next version.
> 
>>> +#define MC_ERR_VPR_STATUS                            0x654
>>> +#define MC_ERR_VPR_ADR                                       0x658
>>> +#define MC_ERR_SEC_STATUS                            0x67c
>>> +#define MC_ERR_SEC_ADR                                       0x680
>>> +#define MC_ERR_MTS_STATUS                            0x9b0
>>> +#define MC_ERR_MTS_ADR                                       0x9b4
>>> +#define MC_ERR_GENERALIZED_CARVEOUT_STATUS           0xc00
>>> +#define MC_ERR_GENERALIZED_CARVEOUT_ADR                      0xc04
>>> +
>>>   #define MC_INT_DECERR_ROUTE_SANITY                   BIT(20)
>>>   #define MC_INT_WCAM_ERR                                      BIT(19)
>>>   #define MC_INT_SCRUB_ECC_WR_ACK                              BIT(18)
>>> @@ -159,6 +168,14 @@ extern const struct tegra_mc_ops tegra186_mc_ops;
>>>   extern const char * const tegra_mc_status_names[32];
>>>   extern const char * const tegra_mc_error_names[8];
>>>
>>> +struct tegra_mc_error {
>>> +     u32 int_bit;
>>> +     const char *msg;
>>> +     u32 status_reg;
>>> +     u32 addr_reg;
>>> +     u32 addr_reg_hi;
>>> +};
>>> +
>>>   /*
>>>    * These IDs are for internal use of Tegra ICC drivers. The ID
>>> numbers are
>>>    * chosen such that they don't conflict with the device-tree ICC
>>> node IDs.
>>> diff --git a/drivers/memory/tegra/tegra186.c
>>> b/drivers/memory/tegra/tegra186.c
>>> index 6766cc4..4f3ae71 100644
>>> --- a/drivers/memory/tegra/tegra186.c
>>> +++ b/drivers/memory/tegra/tegra186.c
>>> @@ -146,8 +146,107 @@ static void tegra186_mc_clear_interrupt(struct
>>> tegra_mc *mc)
>>>        mc_writel(mc, MC_INTSTATUS_CLEAR, MC_INTSTATUS);
>>>   }
>>>
>>> +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,
>>> +     },
>>
>> I see that these VPR registers present on all SoCs starting with T124.
>> It doesn't look like you need the separate IRQ handlers at all, instead
>> please extend the common T30 handler. For example, you may add a
>> switch-case statements to handle those T124+ specific bits differently.
>>
>> static irqreturn_t tegra30_mc_handle_irq(int irq, void *data)
>> {
>> ...
>>          switch (bit) {
>>          case MC_INT_DECERR_VPR:
>>                  status_reg = MC_ERR_VPR_STATUS;
>>                  addr_reg   = MC_ERR_VPR_ADR;
>>                  break;
>>          ...
>>          default:
>>                  status_reg = MC_ERR_STATUS;
>>                  addr_reg   = MC_ERR_ADR;
>>          }
>>
>>          value = mc_readl(mc, status_reg);
>>          ...
>>
>>          value = mc_readl(mc, addr_reg);
> Okay. I'll use same handler as Tegra30 with additional Tegra186 onward
> bits.
> Also, shall I change name of tegra30_mc_handle_irq() to
> tegra_mc_handle_irq() as we are using it across all Tegra SOCs ?

T20 won't use it, no need to change the name.