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SubjectRe: [PATCH v3 1/8] trace: ras: add ARM processor error information trace event
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Hi Tyler,

On 2017/4/17 11:08, Xie XiuQi wrote:
> Hi Tyler,
>
> Thanks for your comments and testing.
>
> On 2017/4/15 4:36, Baicar, Tyler wrote:
>> On 3/30/2017 4:31 AM, Xie XiuQi wrote:
>>> Add a new trace event for ARM processor error information, so that
>>> the user will know what error occurred. With this information the
>>> user may take appropriate action.
>>>
>>> These trace events are consistent with the ARM processor error
>>> information table which defined in UEFI 2.6 spec section N.2.4.4.1.
>>>
>>> ---
>>> v2: add trace enabled condition as Steven's suggestion.
>>> fix a typo.
>>> ---
>>>
>>> Cc: Steven Rostedt <rostedt@goodmis.org>
>>> Cc: Tyler Baicar <tbaicar@codeaurora.org>
>>> Signed-off-by: Xie XiuQi <xiexiuqi@huawei.com>
>>> ---
>> ...
>>> +#define ARM_PROC_ERR_TYPE \
>>> + EM ( CPER_ARM_INFO_TYPE_CACHE, "cache error" ) \
>>> + EM ( CPER_ARM_INFO_TYPE_TLB, "TLB error" ) \
>>> + EM ( CPER_ARM_INFO_TYPE_BUS, "bus error" ) \
>>> + EMe ( CPER_ARM_INFO_TYPE_UARCH, "micro-architectural error" )
>>> +
>>> +#define ARM_PROC_ERR_FLAGS \
>>> + EM ( CPER_ARM_INFO_FLAGS_FIRST, "First error captured" ) \
>>> + EM ( CPER_ARM_INFO_FLAGS_LAST, "Last error captured" ) \
>>> + EM ( CPER_ARM_INFO_FLAGS_PROPAGATED, "Propagated" ) \
>>> + EMe ( CPER_ARM_INFO_FLAGS_OVERFLOW, "Overflow" )
>>> +
>> Hello Xie XiuQi,
>>
>> This isn't compiling for me because of these definitions. Here you are using ARM_*, but below in the TP_printk you are using ARCH_*. The compiler complains the ARCH_* ones are undefined:
>>
>> ./include/trace/../../include/ras/ras_event.h:278:37: error: 'ARCH_PROC_ERR_TYPE' undeclared (first use in this function)
>> __print_symbolic(__entry->type, ARCH_PROC_ERR_TYPE),
>> ./include/trace/../../include/ras/ras_event.h:280:38: error: 'ARCH_PROC_ERR_FLAGS' undeclared (first use in this function)
>> __print_symbolic(__entry->flags, ARCH_PROC_ERR_FLAGS),
>
> Sorry, it's a typo. It should be ARM_xxx.
>
>>
>>> +/*
>>> + * First define the enums in MM_ACTION_RESULT to be exported to userspace
>>> + * via TRACE_DEFINE_ENUM().
>>> + */
>>> +#undef EM
>>> +#undef EMe
>>> +#define EM(a, b) TRACE_DEFINE_ENUM(a);
>>> +#define EMe(a, b) TRACE_DEFINE_ENUM(a);
>>> +
>>> +ARM_PROC_ERR_TYPE
>>> +ARM_PROC_ERR_FLAGS
>> Are the above two lines supposed to be here?
>>> +
>>> +/*
>>> + * Now redefine the EM() and EMe() macros to map the enums to the strings
>>> + * that will be printed in the output.
>>> + */
>>> +#undef EM
>>> +#undef EMe
>>> +#define EM(a, b) { a, b },
>>> +#define EMe(a, b) { a, b }
>>> +
>>> +TRACE_EVENT(arm_proc_err,
>> I think it would be better to keep this similar to the naming of the current RAS trace events (right now we have mc_event, arm_event, aer_event, etc.). I would suggest using "arm_err_info_event" since this is handling the error information structures of the arm errors.
>>> +
>>> + TP_PROTO(const struct cper_arm_err_info *err),
>>> +
>>> + TP_ARGS(err),
>>> +
>>> + TP_STRUCT__entry(
>>> + __field(u8, type)
>>> + __field(u16, multiple_error)
>>> + __field(u8, flags)
>>> + __field(u64, error_info)
>>> + __field(u64, virt_fault_addr)
>>> + __field(u64, physical_fault_addr)
>> Validation bits should also be a part of this structure that way user space tools will know which of these fields are valid.
>
> Could we use the default value to check the validation which we have checked in TP_fast_assign?
>
>>> + ),
>>> +
>>> + TP_fast_assign(
>>> + __entry->type = err->type;
>>> +
>>> + if (err->validation_bits & CPER_ARM_INFO_VALID_MULTI_ERR)
>>> + __entry->multiple_error = err->multiple_error;
>>> + else
>>> + __entry->multiple_error = ~0;
>>> +
>>> + if (err->validation_bits & CPER_ARM_INFO_VALID_FLAGS)
>>> + __entry->flags = err->flags;
>>> + else
>>> + __entry->flags = ~0;
>>> +
>>> + if (err->validation_bits & CPER_ARM_INFO_VALID_ERR_INFO)
>>> + __entry->error_info = err->error_info;
>>> + else
>>> + __entry->error_info = 0ULL;
>>> +
>>> + if (err->validation_bits & CPER_ARM_INFO_VALID_VIRT_ADDR)
>>> + __entry->virt_fault_addr = err->virt_fault_addr;
>>> + else
>>> + __entry->virt_fault_addr = 0ULL;
>>> +
>>> + if (err->validation_bits & CPER_ARM_INFO_VALID_PHYSICAL_ADDR)
>>> + __entry->physical_fault_addr = err->physical_fault_addr;
>>> + else
>>> + __entry->physical_fault_addr = 0ULL;
>>> + ),
>>> +
>>> + TP_printk("ARM Processor Error: type %s; count: %u; flags: %s;"
>> I think the "ARM Processor Error:" part of this should just be removed. Here's the output with this removed and the trace event renamed to arm_err_info_event. I think this looks much cleaner and matches the style used with the arm_event.
>>
>> <idle>-0 [020] .ns. 366.592434: arm_event: affinity level: 2; MPIDR: 0000000000000000; MIDR: 00000000510f8000; running state: 1; PSCI state: 0
>> <idle>-0 [020] .ns. 366.592437: arm_err_info_event: type cache error; count: 0; flags: 0x3; error info: 0000000000c20058; virtual address: 0000000000000000; physical address: 0000000000000000
>

As this section is ARM Processor Error Section, how about use arm_proc_err_event?

> I agree. It looks much better.
>
>>
>> Thanks,
>> Tyler
>>
>

--
Thanks,
Xie XiuQi

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