[+cc Steve, Alex]
On Mon, Apr 02, 2018 at 11:47:08AM -0400, Thomas Tai wrote:
> When a PCIe AER occurs, the TLP header information is
> printed in the kernel message but it is missing from
> the tracepoint. A userspace program can use this information
> in the tracepoint to better analyze problems.
>
> Example tracepoint output:
> aer_event: 0000:01:00.0
> PCIe Bus Error: severity=Uncorrected, non-fatal, Completer Abort
> TLP Header={0x0,0x1,0x2,0x3}
>
> Signed-off-by: Thomas Tai <thomas.tai@xxxxxxxxxx>
I tentatively applied this to pci/aer for v4.18, thanks!
Steve, let me know if you have any comments.
Alex, I just copied you because you've been unifying the AER native and
CPER paths, and this is another case of code that appears in both paths.
FYI only, no action required :)
> ---
> drivers/pci/pcie/aer/aerdrv_errprint.c | 4 ++--
> include/ras/ras_event.h | 20 ++++++++++++++++----
> 2 files changed, 18 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/pci/pcie/aer/aerdrv_errprint.c b/drivers/pci/pcie/aer/aerdrv_errprint.c
> index 6a352e638699..0a78a773bd25 100644
> --- a/drivers/pci/pcie/aer/aerdrv_errprint.c
> +++ b/drivers/pci/pcie/aer/aerdrv_errprint.c
> @@ -192,7 +192,7 @@ void aer_print_error(struct pci_dev *dev, struct aer_err_info *info)
> pci_err(dev, " Error of this Agent(%04x) is reported first\n", id);
>
> trace_aer_event(dev_name(&dev->dev), (info->status & ~info->mask),
> - info->severity);
> + info->severity, info->tlp_header_valid, &info->tlp);
> }
>
> void aer_print_port_info(struct pci_dev *dev, struct aer_err_info *info)
> @@ -252,6 +252,6 @@ void cper_print_aer(struct pci_dev *dev, int aer_severity,
> __print_tlp_header(dev, &aer->header_log);
>
> trace_aer_event(dev_name(&dev->dev), (status & ~mask),
> - aer_severity);
> + aer_severity, tlp_header_valid, &aer->header_log);
> }
> #endif
> diff --git a/include/ras/ras_event.h b/include/ras/ras_event.h
> index 9c689868eb4d..90f59556f595 100644
> --- a/include/ras/ras_event.h
> +++ b/include/ras/ras_event.h
> @@ -298,30 +298,42 @@ TRACE_EVENT(non_standard_event,
> TRACE_EVENT(aer_event,
> TP_PROTO(const char *dev_name,
> const u32 status,
> - const u8 severity),
> + const u8 severity,
> + const u32 tlp_header_valid,
> + struct aer_header_log_regs *tlp),
>
> - TP_ARGS(dev_name, status, severity),
> + TP_ARGS(dev_name, status, severity, tlp_header_valid, tlp),
>
> TP_STRUCT__entry(
> __string( dev_name, dev_name )
> __field( u32, status )
> __field( u8, severity )
> + __field( u32, tlp_header_valid)
> + __array( u32, buf, 4 )
> ),
>
> TP_fast_assign(
> __assign_str(dev_name, dev_name);
> __entry->status = status;
> __entry->severity = severity;
> + __entry->tlp_header_valid = tlp_header_valid;
> + __entry->buf[0] = tlp->dw0;
> + __entry->buf[1] = tlp->dw1;
> + __entry->buf[2] = tlp->dw2;
> + __entry->buf[3] = tlp->dw3;
> ),
>
> - TP_printk("%s PCIe Bus Error: severity=%s, %s\n",
> + TP_printk("%s PCIe Bus Error: severity=%s, %s, TLP Header=%s\n",
> __get_str(dev_name),
> __entry->severity == AER_CORRECTABLE ? "Corrected" :
> __entry->severity == AER_FATAL ?
> "Fatal" : "Uncorrected, non-fatal",
> __entry->severity == AER_CORRECTABLE ?
> __print_flags(__entry->status, "|", aer_correctable_errors) :
> - __print_flags(__entry->status, "|", aer_uncorrectable_errors))
> + __print_flags(__entry->status, "|", aer_uncorrectable_errors),
> + __entry->tlp_header_valid ?
> + __print_array(__entry->buf, 4, sizeof(unsigned int)) :
> + "Not available")
> );
>
> /*
> --
> 2.14.1
>
