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<== Date ==> <== Thread ==>
Subject: mrfioc2/devlib2 PCI device resource file error
From: Steve Kinder - STFC UKRI via Tech-talk <tech-talk at aps.anl.gov>
To: tech-talk <tech-talk at aps.anl.gov>
Date: Tue, 11 Jul 2023 11:20:31 +0000
I am moving from use of:
  • PSI mrfioc2 3-0-5 and devlib2 2-10
to:
  • PSI mrfioc2 3-1-0 and devlib2 2-11
On starting the IOC I now get an extra error, as in the permission denied below:

mrmEvrSetupPCI("EVR-01", 0, 0x81, 0, 0)
Checking if card EVR-01 is already in use
Probing for PCI device (domain=0, bus=129, device=0, function=0
Device EVR-01  81:0.0
Using IRQ 37
Failed to open resource file for PCI device 0000:81:00.0: Permission denied
Setting magic LE number!
Firmware version register: 0x17060207
Firmware version: 0x00020706
Minimal supported firmware version for Event receiver PCIe with delay compensation support is 0x20706
Found EVR-01:SFP0 SFP transceiver
Initialized EVR-01:Sequencer
Out FP:0 FPUNIV:16 RB:0 IFP:0 GPIO:0
Initialized EVR-01 data buffer type: 230
Initialized EVR-01 data buffer type: 300

Having investigated the mrfioc2/devlib2 code a little this message seems to come from open_res() in the 2-11 devlib2 code pciApp/os/Linux/devLibPCIOSD.c. There is a print at line 389 that didn't exist in the 2-10 version. I believe this failure to open /sys/bus/pci/devices/0000:81:00.0/resource0 was always happening but I was unaware. Should I be concerned about this and change the permissions on this file at boot or just ignore it?

Thanks

Steve

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