pcie: kernel log - BAR 15: no space for... BAR 15: failed to assign..

[Muni Sekhar]

On Tue, Feb 11, 2020 at 3:58 AM Bjorn Helgaas <helgaas at kernel.org> wrote:
>
> On Sun, Feb 09, 2020 at 07:59:41AM +0530, Muni Sekhar wrote:
> > Hi all,
> >
> > After rebooting the system following messages are seen in dmesg.
> > Not sure if these indicate a problem. Can some one look at these and
> > confirm if this is problem or can be ignored ?
> >
> > Also any suggestions as to what would cause this?
> >
> > [    1.084728] pci 0000:00:1c.0: BAR 15: no space for [mem size
> > 0x00200000 64bit pref]
> > [    1.084813] pci 0000:00:1c.0: BAR 15: failed to assign [mem size
> > 0x00200000 64bit pref]
> > [    1.084890] pci 0000:00:1c.2: BAR 14: no space for [mem size 0x00200000]
> > [    1.084949] pci 0000:00:1c.2: BAR 14: failed to assign [mem size 0x00200000]
> > [    1.085037] pci 0000:00:1c.2: BAR 15: no space for [mem size
> > 0x00200000 64bit pref]
> > [    1.085108] pci 0000:00:1c.2: BAR 15: failed to assign [mem size
> > 0x00200000 64bit pref]
> > [    1.085199] pci 0000:00:1c.3: BAR 15: no space for [mem size
> > 0x00200000 64bit pref]
> > [    1.085270] pci 0000:00:1c.3: BAR 15: failed to assign [mem size
> > 0x00200000 64bit pref]
> > [    1.085343] pci 0000:00:1c.0: BAR 13: assigned [io  0x1000-0x1fff]
> > [    1.085403] pci 0000:00:1c.2: BAR 13: assigned [io  0x2000-0x2fff]
> > [    1.085470] pci 0000:00:1c.3: BAR 15: no space for [mem size
> > 0x00200000 64bit pref]
> > [    1.085540] pci 0000:00:1c.3: BAR 15: failed to assign [mem size
> > 0x00200000 64bit pref]
> > [    1.085613] pci 0000:00:1c.2: BAR 14: no space for [mem size 0x00200000]
> > [    1.085672] pci 0000:00:1c.2: BAR 14: failed to assign [mem size 0x00200000]
> > [    1.085738] pci 0000:00:1c.2: BAR 15: no space for [mem size
> > 0x00200000 64bit pref]
> > [    1.085808] pci 0000:00:1c.2: BAR 15: failed to assign [mem size
> > 0x00200000 64bit pref]
> > [    1.085884] pci 0000:00:1c.0: BAR 15: no space for [mem size
> > 0x00200000 64bit pref]
> > [    1.085954] pci 0000:00:1c.0: BAR 15: failed to assign [mem size
> > 0x00200000 64bit pref]
> > [    1.086026] pci 0000:00:1c.0: PCI bridge to [bus 01]
> > [    1.086083] pci 0000:00:1c.0:   bridge window [io  0x1000-0x1fff]
> > [    1.086144] pci 0000:00:1c.0:   bridge window [mem 0xd0400000-0xd07fffff]
>
> The "no space" and "failed to assign" messages are all for bridge
> windows (13 is the I/O window, 14 is the MMIO window, 15 is the MMIO
> pref window).  I can't tell if you have any devices below these
> bridges (lspci would show them).  If you don't have any devices below
> these bridges, you can ignore the messages.
I have the devices below these bridges. FPGA endpoint is connected to
'00:1c.0 PCI bridge' and Ethernet controller is connected to '00:1c.3
PCI bridge'.
Does these messages impact the functionality of the connected devices?
If so what kind of impact and is there any solution for this?
Also, I'd like to know why "no space" and "failed to assign" messages displayed?


>
> Bjorn



-- 
Thanks,
Sekhar