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Date: Mon, 2 Dec 2013 13:05:16 +0800
From: rui wang <ruiv.wang@...il.com>
To: Lance Ortiz <lance.ortiz@...com>
Cc: bhelgaas@...gle.com, lance_ortiz@...mail.com, jiang.liu@...el.com,
tony.luck@...el.com, bp@...en8.de, rostedt@...dmis.org,
mchehab@...hat.com, linux-acpi@...r.kernel.org,
linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
gong.chen@...el.com
Subject: Re: [PATCH v10 1/3] aerdrv: Trace Event for AER
On 1/17/13, Lance Ortiz <lance.ortiz@...com> wrote:
> This header file will define a new trace event that will be triggered when
> a AER event occurs. The following data will be provided to the trace
> event.
>
> char * dev_name - The name of the slot where the device resides
> ([domain:]bus:device.function).
>
> u32 status - Either the correctable or uncorrectable register
> indicating what error or errors have been see.
>
> u8 severity - error severity 0:NONFATAL 1:FATAL 2:CORRECTED
>
> The trace event will also provide a trace string that may look like:
>
> "0000:05:00.0 PCIe Bus Error:severity=Uncorrected (Non-Fatal), Poisoned
> TLP"
>
> v1-v2 Move header from include/ras/aer_event.h to
> include/trace/events/ras.h
> v3-v4 Cleaned up comments and commit header
> v4-v5 More cleanup remove () from if statement in print.
> Renamed string define to be more specific.
> v5-v6 change TRACE_SYSTEM define to be ras and not aer.
>
> Signed-off-by: Lance Ortiz <lance.ortiz@...com>
> Acked-by: Mauro Carvalho Chehab <mchehab@...hat.com>
> Acked-by: Tony Luck <tony.luck@...el.com>
> ---
>
> include/trace/events/ras.h | 77
> ++++++++++++++++++++++++++++++++++++++++++++
> 1 files changed, 77 insertions(+), 0 deletions(-)
> create mode 100644 include/trace/events/ras.h
>
> diff --git a/include/trace/events/ras.h b/include/trace/events/ras.h
> new file mode 100644
> index 0000000..88b8783
> --- /dev/null
> +++ b/include/trace/events/ras.h
> @@ -0,0 +1,77 @@
> +#undef TRACE_SYSTEM
> +#define TRACE_SYSTEM ras
> +
> +#if !defined(_TRACE_AER_H) || defined(TRACE_HEADER_MULTI_READ)
> +#define _TRACE_AER_H
> +
> +#include <linux/tracepoint.h>
> +#include <linux/edac.h>
> +
> +
> +/*
> + * PCIe AER Trace event
> + *
> + * These events are generated when hardware detects a corrected or
> + * uncorrected event on a PCIe device. The event report has
> + * the following structure:
> + *
> + * char * dev_name - The name of the slot where the device resides
> + * ([domain:]bus:device.function).
> + * u32 status - Either the correctable or uncorrectable register
> + * indicating what error or errors have been seen
> + * u8 severity - error severity 0:NONFATAL 1:FATAL 2:CORRECTED
> + */
> +
> +#define aer_correctable_errors \
> + {BIT(0), "Receiver Error"}, \
> + {BIT(6), "Bad TLP"}, \
> + {BIT(7), "Bad DLLP"}, \
> + {BIT(8), "RELAY_NUM Rollover"}, \
> + {BIT(12), "Replay Timer Timeout"}, \
> + {BIT(13), "Advisory Non-Fatal"}
> +
> +#define aer_uncorrectable_errors \
> + {BIT(4), "Data Link Protocol"}, \
> + {BIT(12), "Poisoned TLP"}, \
> + {BIT(13), "Flow Control Protocol"}, \
> + {BIT(14), "Completion Timeout"}, \
> + {BIT(15), "Completer Abort"}, \
> + {BIT(16), "Unexpected Completion"}, \
> + {BIT(17), "Receiver Overflow"}, \
> + {BIT(18), "Malformed TLP"}, \
> + {BIT(19), "ECRC"}, \
> + {BIT(20), "Unsupported Request"}
> +
> +TRACE_EVENT(aer_event,
> + TP_PROTO(const char *dev_name,
> + const u32 status,
> + const u8 severity),
> +
> + TP_ARGS(dev_name, status, severity),
> +
> + TP_STRUCT__entry(
> + __string( dev_name, dev_name )
> + __field( u32, status )
> + __field( u8, severity )
> + ),
> +
> + TP_fast_assign(
> + __assign_str(dev_name, dev_name);
> + __entry->status = status;
> + __entry->severity = severity;
> + ),
> +
> + TP_printk("%s PCIe Bus Error: severity=%s, %s\n",
> + __get_str(dev_name),
> + __entry->severity == HW_EVENT_ERR_CORRECTED ? "Corrected" :
> + __entry->severity == HW_EVENT_ERR_FATAL ?
> + "Fatal" : "Uncorrected",
> + __entry->severity == HW_EVENT_ERR_CORRECTED ?
> + __print_flags(__entry->status, "|", aer_correctable_errors) :
> + __print_flags(__entry->status, "|", aer_uncorrectable_errors))
> +);
This causes inconsistency between dmesg and the trace event output.
When dmesg says "severity=Corrected", the trace event says
"severity=Fatal". What happens is that HW_EVENT_ERR_CORRECTED is
defined in edac.h:
enum hw_event_mc_err_type {
HW_EVENT_ERR_CORRECTED,
HW_EVENT_ERR_UNCORRECTED,
HW_EVENT_ERR_FATAL,
HW_EVENT_ERR_INFO,
};
while aer_print_error() uses aer_error_severity_string[] defined as:
static const char *aer_error_severity_string[] = {
"Uncorrected (Non-Fatal)",
"Uncorrected (Fatal)",
"Corrected"
};
In this case dmesg is correct because info->severity is assigned in
aer_isr_one_error() using the definitions in include/linux/ras.h:
#define AER_NONFATAL 0
#define AER_FATAL 1
#define AER_CORRECTABLE 2
So which one is the standard? Is there a plan to unify all these names?
Thanks
Rui Wang
> +
> +#endif /* _TRACE_AER_H */
> +
> +/* This part must be outside protection */
> +#include <trace/define_trace.h>
>
> --
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