VDM = Venodor Defined Message On Fri, May 30, 2014 at 10:51 PM, Alexander Duyck <alexander.h.du...@intel.com> wrote: > On 05/30/2014 04:50 AM, shiv prakash Agarwal wrote: >> Thanks all, >> >> Finally we see that this hang occurs because some VDM is sent by this I210 >> card. >> Why this card sends VDM? and how can we disable it? > > > I'm not sure what you mean by VDM? Are you referring to the AER error > message that is sent by the part? If so I believe this is being sent > because the I210 is either misconfigured or because the platform is > violating PCIe spec in some way that is triggering the device to send an > error message. Remember the key bit in all of this is the status of the > device before you load the driver: > >> Capabilities: [100 v2] Advanced Error Reporting >> UESta: DLP+ SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- >> RxOF- MalfTLP- ECRC- UnsupReq- ACSViol- >> UEMsk: DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- >> RxOF- MalfTLP- ECRC- UnsupReq- ACSViol- >> UESvrt: DLP+ SDES+ TLP- FCP+ CmpltTO- CmpltAbrt- UnxCmplt- >> RxOF+ MalfTLP+ ECRC- UnsupReq- ACSViol- >> CESta: RxErr- BadTLP- BadDLLP- Rollover- Timeout+ >> NonFatalErr- >> CEMsk: RxErr- BadTLP- BadDLLP- Rollover- Timeout- >> NonFatalErr+ >> AERCap: First Error Pointer: 00, GenCap+ CGenEn- ChkCap+ >> ChkEn- > > That DLP+ indicates an error occurred and that the device will send an > error message as soon as the bus mastering is enabled. > > One thing I would recommend trying is clearing the UEsta and UESvrt bits > so that they all read as 0, or - in the lspci dump. Then you might try > resetting the part via the sysfs reset control and verify that those > bits are still cleared. However at this point it seems like this > platform you are running the part in has some PCIe issues and that is > beyond the scope of what we can really debug from the driver and OS > stack. To resolve it you would likely need a PCIe protocol analyzer so > you could see what the DLP error actually was. > > Thanks, > > Alex > > >
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