linux-kernel - Re: [PATCH v2 1/2] tracing: Include PPIN in mce

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Date: Thu, 25 Jan 2024 12:58:16 -0800
From: Sohil Mehta <sohil.mehta@...el.com>
To: Avadhut Naik <avadhut.naik@....com>, <linux-trace-kernel@...r.kernel.org>,
	<linux-edac@...r.kernel.org>
CC: <rostedt@...dmis.org>, <tony.luck@...el.com>, <bp@...en8.de>,
	<x86@...nel.org>, <linux-kernel@...r.kernel.org>, <yazen.ghannam@....com>,
	<avadnaik@....com>
Subject: Re: [PATCH v2 1/2] tracing: Include PPIN in mce_record tracepoint

On 1/25/2024 10:48 AM, Avadhut Naik wrote:
> Machine Check Error information from struct mce is exported to userspace
> through the mce_record tracepoint.
> 
> Currently, however, the PPIN (Protected Processor Inventory Number) field
> of struct mce is not exported through the tracepoint.
> 
> Export PPIN through the tracepoint as it may provide useful information
> for debug and analysis.
> 
> Signed-off-by: Avadhut Naik <avadhut.naik@....com>
> ---

The patch looks fine to me expect for a nit below.

With that fixed, please feel free to add:
Reviewed-by: Sohil Mehta <sohil.mehta@...el.com>

>  include/trace/events/mce.h | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/include/trace/events/mce.h b/include/trace/events/mce.h
> index 1391ada0da3b..657b93ec8176 100644
> --- a/include/trace/events/mce.h
> +++ b/include/trace/events/mce.h
> @@ -25,6 +25,7 @@ TRACE_EVENT(mce_record,
>  		__field(	u64,		ipid		)
>  		__field(	u64,		ip		)
>  		__field(	u64,		tsc		)
> +		__field(	u64,		ppin	)

The tabs are not aligned with the rest of the structure.

>  		__field(	u64,		walltime	)
>  		__field(	u32,		cpu		)
>  		__field(	u32,		cpuid		)
> @@ -45,6 +46,7 @@ TRACE_EVENT(mce_record,
>  		__entry->ipid		= m->ipid;
>  		__entry->ip		= m->ip;
>  		__entry->tsc		= m->tsc;
> +		__entry->ppin		= m->ppin;
>  		__entry->walltime	= m->time;
>  		__entry->cpu		= m->extcpu;
>  		__entry->cpuid		= m->cpuid;
> @@ -55,7 +57,7 @@ TRACE_EVENT(mce_record,
>  		__entry->cpuvendor	= m->cpuvendor;
>  	),
>  
> -	TP_printk("CPU: %d, MCGc/s: %llx/%llx, MC%d: %016Lx, IPID: %016Lx, ADDR/MISC/SYND: %016Lx/%016Lx/%016Lx, RIP: %02x:<%016Lx>, TSC: %llx, PROCESSOR: %u:%x, TIME: %llu, SOCKET: %u, APIC: %x",
> +	TP_printk("CPU: %d, MCGc/s: %llx/%llx, MC%d: %016Lx, IPID: %016Lx, ADDR/MISC/SYND: %016Lx/%016Lx/%016Lx, RIP: %02x:<%016Lx>, TSC: %llx, PPIN: %llx, PROCESSOR: %u:%x, TIME: %llu, SOCKET: %u, APIC: %x",
>  		__entry->cpu,
>  		__entry->mcgcap, __entry->mcgstatus,
>  		__entry->bank, __entry->status,
> @@ -63,6 +65,7 @@ TRACE_EVENT(mce_record,
>  		__entry->addr, __entry->misc, __entry->synd,
>  		__entry->cs, __entry->ip,
>  		__entry->tsc,
> +		__entry->ppin,
>  		__entry->cpuvendor, __entry->cpuid,
>  		__entry->walltime,
>  		__entry->socketid,