On Thu, Jul 05, 2018 at 04:14:06PM +0200, Oliver Neukum wrote: > Hi, Hi, > I have a laptop with two type C connectors. If I boot with a device > attached to a type C port, the firmware will assign 8K io space to the > bridge (v4.18-rc3): > > 6088-608b : 0000:00:17.0 > 6088-608b : ahci > 7000-8fff : PCI Bus 0000:04 > 7000-8fff : PCI Bus 0000:05 > 7000-7fff : PCI Bus 0000:07 > 8000-8fff : PCI Bus 0000:3b > efa0-efbf : 0000:00:1f.4 > efa0-efbf : i801_smbus > > If however, I boot without a device, the allocation is less generous: > > 6088-608b : 0000:00:17.0 > 6088-608b : ahci > 7000-7fff : PCI Bus 0000:04 > efa0-efbf : 0000:00:1f.4 > efa0-efbf : i801_smbus > > Which leads to failures when something is plugged in: > > [ 300.312233] pci 0000:04:00.0: [8086:1578] type 01 class 0x060400 > [ 300.312286] pci 0000:04:00.0: enabling Extended Tags > [ 300.312356] pci 0000:04:00.0: supports D1 D2 > [ 300.312358] pci 0000:04:00.0: PME# supported from D0 D1 D2 D3hot D3cold > [ 300.312676] pci 0000:05:00.0: [8086:1578] type 01 class 0x060400 > [ 300.312733] pci 0000:05:00.0: enabling Extended Tags > [ 300.312825] pci 0000:05:00.0: supports D1 D2 > [ 300.312827] pci 0000:05:00.0: PME# supported from D0 D1 D2 D3hot D3cold > [ 300.312923] pci 0000:05:01.0: [8086:1578] type 01 class 0x060400 > [ 300.312987] pci 0000:05:01.0: enabling Extended Tags > [ 300.313061] pci 0000:05:01.0: supports D1 D2 > [ 300.313063] pci 0000:05:01.0: PME# supported from D0 D1 D2 D3hot D3cold > [ 300.313153] pci 0000:05:02.0: [8086:1578] type 01 class 0x060400 > [ 300.313226] pci 0000:05:02.0: enabling Extended Tags > [ 300.313317] pci 0000:05:02.0: supports D1 D2 > [ 300.313319] pci 0000:05:02.0: PME# supported from D0 D1 D2 D3hot D3cold > [ 300.313398] pci 0000:05:04.0: [8086:1578] type 01 class 0x060400 > [ 300.313451] pci 0000:05:04.0: enabling Extended Tags > [ 300.313522] pci 0000:05:04.0: supports D1 D2 > [ 300.313524] pci 0000:05:04.0: PME# supported from D0 D1 D2 D3hot D3cold > [ 300.313615] pci 0000:04:00.0: PCI bridge to [bus 05-6e] > [ 300.313623] pci 0000:04:00.0: bridge window [mem 0xac000000-0xda0fffff] > [ 300.313629] pci 0000:04:00.0: bridge window [mem 0x60000000-0xa9ffffff 64bit pref] > [ 300.313673] pci 0000:05:00.0: PCI bridge to [bus 06] > [ 300.313681] pci 0000:05:00.0: bridge window [mem 0xda000000-0xda0fffff] > [ 300.313726] pci 0000:05:01.0: PCI bridge to [bus 07-39] > [ 300.313734] pci 0000:05:01.0: bridge window [mem 0xac000000-0xc3efffff] > [ 300.313740] pci 0000:05:01.0: bridge window [mem 0x60000000-0x7fffffff 64bit pref] > [ 300.313797] pci 0000:3a:00.0: [8086:15b6] type 00 class 0x0c0330 > [ 300.313831] pci 0000:3a:00.0: reg 0x10: [mem 0xc3f00000-0xc3f0ffff] > [ 300.313903] pci 0000:3a:00.0: enabling Extended Tags > [ 300.313993] pci 0000:3a:00.0: supports D1 D2 > [ 300.313995] pci 0000:3a:00.0: PME# supported from D0 D1 D2 D3hot D3cold > [ 300.314126] pci 0000:05:02.0: PCI bridge to [bus 3a] > [ 300.314134] pci 0000:05:02.0: bridge window [mem 0xc3f00000-0xc3ffffff] > [ 300.314178] pci 0000:05:04.0: PCI bridge to [bus 3b-6e] > [ 300.314186] pci 0000:05:04.0: bridge window [mem 0xc4000000-0xd9ffffff] > [ 300.314192] pci 0000:05:04.0: bridge window [mem 0x80000000-0xa9ffffff 64bit pref] > [ 300.314218] pci_bus 0000:05: Allocating resources > [ 300.314270] pci 0000:05:01.0: bridge window [io 0x1000-0x0fff] to [bus 07-39] add_size 1000 > [ 300.314285] pci 0000:05:04.0: bridge window [io 0x1000-0x0fff] to [bus 3b-6e] add_size 1000 > [ 300.314294] pci 0000:04:00.0: bridge window [io 0x1000-0x0fff] to [bus 05-6e] add_size 2000 > [ 300.314297] pci 0000:04:00.0: BAR 13: no space for [io size 0x2000] > [ 300.314299] pci 0000:04:00.0: BAR 13: failed to assign [io size 0x2000] > [ 300.314301] pci 0000:04:00.0: BAR 13: no space for [io size 0x2000] > [ 300.314303] pci 0000:04:00.0: BAR 13: failed to assign [io size 0x2000] > [ 300.314305] pci 0000:05:01.0: BAR 13: no space for [io size 0x1000] > [ 300.314307] pci 0000:05:01.0: BAR 13: failed to assign [io size 0x1000] > [ 300.314308] pci 0000:05:04.0: BAR 13: no space for [io size 0x1000] > [ 300.314310] pci 0000:05:04.0: BAR 13: failed to assign [io size 0x1000] > [ 300.314312] pci 0000:05:04.0: BAR 13: no space for [io size 0x1000] > [ 300.314313] pci 0000:05:04.0: BAR 13: failed to assign [io size 0x1000] > [ 300.314315] pci 0000:05:01.0: BAR 13: no space for [io size 0x1000] > [ 300.314317] pci 0000:05:01.0: BAR 13: failed to assign [io size 0x1000] These are not real "failures" per se but more like a "feature". They result from these: [ 300.314270] pci 0000:05:01.0: bridge window [io 0x1000-0x0fff] to [bus 07-39] add_size 1000 [ 300.314285] pci 0000:05:04.0: bridge window [io 0x1000-0x0fff] to [bus 3b-6e] add_size 1000 [ 300.314294] pci 0000:04:00.0: bridge window [io 0x1000-0x0fff] to [bus 05-6e] add_size 2000 and they are because Linux tries to allocate a bit more, just in case and that fails. None of the involved devices should be using I/O space for anything unless there are legacy PCIe endpoints which is not true in this case. Do you see that some of your devices fail to function because of this?
