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

[Bjorn Helgaas]

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.

Bjorn