Investigate AER issues

[bluecmd]

On a cold-boot, a modprobe fejkon produces this:

 		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-
+		CESta:	RxErr+ BadTLP+ BadDLLP+ Rollover- Timeout- NonFatalErr+
 		CEMsk:	RxErr- BadTLP- BadDLLP- Rollover- Timeout- NonFatalErr+

I.e we have triggered BadTLP+ I guess?

[bluecmd]

Another data point: Disabling AER kills the system when doing the benchmark

[bluecmd]

With the new PCIe stack in master right now (currently fa813ab) stress-testing reports 48 Mbit/s with and without AER. So the AER hang seems to be gone at least.

lspci still reports:

	Capabilities: [800 v1] 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-

[bluecmd]

After flashing the same build artifact and power cycling the AER issues are back. I've tried programming, and coldbooting, and various combinations without success.

The errors seems to be missing completions, since CmpltTO is logged.

The stats on the FPGA is:

% pcie
 My ID                : 0xb300
 TLP RX               : 0x00000001
 TLP Unsupported RX   : 0x00000000
 TLP TX Data          : 0x00000000
 TLP TX Instant       : 0x00000000
 TLP TX Response      : 0x00000001
 Last TLP RX          : 0x00000001 0xb200000f 0xfbe00004 0x00000000 0xffffffff 0xffffffff 0xffffffff 0xffffffff
 Last TLP TX Data     : 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000
 Last TLP TX Instant  : 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000 0x00000000
 Last TLP TX Response : 0x4a000001 0xb3000004 0xb2000004 0xdeadbeef 0xffffffff 0xffffffff 0xffffffff 0xffffffff