On a system with a recent Fedora kernel (3.14.9-200.fc20.x86_64), a
hotplugged PCI device is unable to get memory mapped IO:
...
[ 183.247377] pcieport 0000:9a:00.0: BAR 15: can't assign mem pref
(size 0x100000)
[ 183.247384] pcieport 0000:9b:15.0: BAR 14: can't assign mem (size 0x100000)
[ 183.247388] pcieport 0000:9b:15.0: BAR 15: can't assign mem pref
(size 0x100000)
[ 183.247394] pci 0000:a5:00.0: BAR 6: can't assign mem pref (size 0x10000)
[ 183.247397] pci 0000:a5:00.0: BAR 0: can't assign mem (size 0x4000)
The device is connected to a switch supporting hotplug (i.e. SltCap
includes HotPlug+) and I have added
pci=realloc,hpmemsize=16M
to the kernel boot parameters. This appears to have increased the
prefetchable memory but not the memory mapped IO:
99:00.0 PCI bridge: PLX Technology, Inc. Device 8733 (rev ca) (prog-if
00 [Normal decode])
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop-
ParErr- Stepping- SERR- FastB2B- DisINTx+
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort-
<TAbort- <MAbort- >SERR- <PERR- INTx-
Latency: 0, Cache Line Size: 64 bytes
Bus: primary=99, secondary=9a, subordinate=a5, sec-latency=0
I/O behind bridge: 0000d000-0000ffff
Memory behind bridge: fb100000-fbafffff
Prefetchable memory behind bridge: 0000381000000000-0000381000ffffff
Should this work or am I missing a step somewhere? TIA.
Full dmesg http://pastebin.com/pZ1zzHS6
Full lspci -vv http://pastebin.com/n57UheAE
--chuck
--
To unsubscribe from this list: send the line "unsubscribe linux-pci" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
