Message-ID: <6bf478b8-2194-4ffb-aaac-8e3e314ad71c@w6rz.net>
Date: Fri, 17 Oct 2025 07:21:06 -0700
From: Ron Economos <re@...z.net>
To: Krishna Chaitanya Chundru <krishna.chundru@....qualcomm.com>,
 Manivannan Sadhasivam <mani@...nel.org>
Cc: Bjorn Helgaas <helgaas@...nel.org>, Conor Dooley <conor@...nel.org>,
 bhelgaas@...gle.com, linux-pci@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-riscv <linux-riscv@...ts.infradead.org>,
 Paul Walmsley <pjw@...nel.org>, Greentime Hu <greentime.hu@...ive.com>,
 Samuel Holland <samuel.holland@...ive.com>, regressions@...ts.linux.dev
Subject: Re: SiFive FU740 PCI driver fails on 6.18-rc1

On 10/17/25 04:43, Krishna Chaitanya Chundru wrote:
>
>
> On 10/15/2025 7:33 PM, Manivannan Sadhasivam wrote:
>> On Tue, Oct 14, 2025 at 03:41:39PM -0700, Ron Economos wrote:
>>> On 10/14/25 09:25, Manivannan Sadhasivam wrote:
>>>> On Mon, Oct 13, 2025 at 10:52:48PM -0700, Ron Economos wrote:
>>>>> On 10/13/25 22:36, Krishna Chaitanya Chundru wrote:
>>>>>>
>>>>>> On 10/14/2025 10:56 AM, Ron Economos wrote:
>>>>>>> On 10/13/25 22:20, Krishna Chaitanya Chundru wrote:
>>>>>>>>
>>>>>>>> On 10/14/2025 2:58 AM, Bjorn Helgaas wrote:
>>>>>>>>> [+cc FU740 driver folks, Conor, regressions]
>>>>>>>>>
>>>>>>>>> On Mon, Oct 13, 2025 at 12:14:54AM -0700, Ron Economos wrote:
>>>>>>>>>> The SiFive FU740 PCI driver fails on the HiFive
>>>>>>>>>> Unmatched board with Linux
>>>>>>>>>> 6.18-rc1. The error message is:
>>>>>>>>>>
>>>>>>>>>> [    3.166624] fu740-pcie e00000000.pcie: host bridge
>>>>>>>>>> /soc/pcie@...000000
>>>>>>>>>> ranges:
>>>>>>>>>> [    3.166706] fu740-pcie e00000000.pcie: IO
>>>>>>>>>> 0x0060080000..0x006008ffff -> 0x0060080000
>>>>>>>>>> [    3.166767] fu740-pcie e00000000.pcie: MEM
>>>>>>>>>> 0x0060090000..0x007fffffff -> 0x0060090000
>>>>>>>>>> [    3.166805] fu740-pcie e00000000.pcie: MEM
>>>>>>>>>> 0x2000000000..0x3fffffffff -> 0x2000000000
>>>>>>>>>> [    3.166950] fu740-pcie e00000000.pcie: ECAM at [mem
>>>>>>>>>> 0xdf0000000-0xdffffffff] for [bus 00-ff]
>>>>>>>>>> [    3.579500] fu740-pcie e00000000.pcie: No iATU regions found
>>>>>>>>>> [    3.579552] fu740-pcie e00000000.pcie: Failed to
>>>>>>>>>> configure iATU in ECAM
>>>>>>>>>> mode
>>>>>>>>>> [    3.579655] fu740-pcie e00000000.pcie: probe with
>>>>>>>>>> driver fu740-pcie
>>>>>>>>>> failed with error -22
>>>>>>>>>>
>>>>>>>>>> The normal message (on Linux 6.17.2) is:
>>>>>>>>>>
>>>>>>>>>> [    3.381487] fu740-pcie e00000000.pcie: host bridge
>>>>>>>>>> /soc/pcie@...000000
>>>>>>>>>> ranges:
>>>>>>>>>> [    3.381584] fu740-pcie e00000000.pcie: IO
>>>>>>>>>> 0x0060080000..0x006008ffff -> 0x0060080000
>>>>>>>>>> [    3.381682] fu740-pcie e00000000.pcie: MEM
>>>>>>>>>> 0x0060090000..0x007fffffff -> 0x0060090000
>>>>>>>>>> [    3.381724] fu740-pcie e00000000.pcie: MEM
>>>>>>>>>> 0x2000000000..0x3fffffffff -> 0x2000000000
>>>>>>>>>> [    3.484809] fu740-pcie e00000000.pcie: iATU: unroll
>>>>>>>>>> T, 8 ob, 8 ib, align
>>>>>>>>>> 4K, limit 4096G
>>>>>>>>>> [    3.683678] fu740-pcie e00000000.pcie: PCIe Gen.1 x8 link up
>>>>>>>>>> [    3.883674] fu740-pcie e00000000.pcie: PCIe Gen.3 x8 link up
>>>>>>>>>> [    3.987678] fu740-pcie e00000000.pcie: PCIe Gen.3 x8 link up
>>>>>>>>>> [    3.988164] fu740-pcie e00000000.pcie: PCI host
>>>>>>>>>> bridge to bus 0000:00
>>>>>>>>>>
>>>>>>>>>> Reverting the following commits solves the issue.
>>>>>>>>>>
>>>>>>>>>> 0da48c5b2fa731b21bc523c82d927399a1e508b0 PCI: dwc:
>>>>>>>>>> Support ECAM mechanism by
>>>>>>>>>> enabling iATU 'CFG Shift Feature'
>>>>>>>>>>
>>>>>>>>>> 4660e50cf81800f82eeecf743ad1e3e97ab72190 PCI: qcom:
>>>>>>>>>> Prepare for the DWC ECAM
>>>>>>>>>> enablement
>>>>>>>>>>
>>>>>>>>>> f6fd357f7afbeb34a633e5688a23b9d7eb49d558 PCI: dwc:
>>>>>>>>>> Prepare the driver for
>>>>>>>>>> enabling ECAM mechanism using iATU 'CFG Shift Feature'
>>>>>>>>> As Conor pointed out, we can't fix a code regression with a DT 
>>>>>>>>> change.
>>>>>>>>>
>>>>>>>>> #regzbot introduced: f6fd357f7afb ("PCI: dwc: Prepare the
>>>>>>>>> driver for enabling ECAM mechanism using iATU 'CFG Shift
>>>>>>>>> Feature'")
>>>>>>>> Hi Conor,
>>>>>>>>
>>>>>>>> Can you try with this patch and see if it is fixing the issue.
>>>>>>>> diff --git a/drivers/pci/controller/dwc/pcie-fu740.c
>>>>>>>> b/drivers/pci/controller/dwc/pcie-fu740.c
>>>>>>>> index 66367252032b..b5e0f016a580 100644
>>>>>>>> --- a/drivers/pci/controller/dwc/pcie-fu740.c
>>>>>>>> +++ b/drivers/pci/controller/dwc/pcie-fu740.c
>>>>>>>> @@ -328,6 +328,8 @@ static int fu740_pcie_probe(struct
>>>>>>>> platform_device *pdev)
>>>>>>>>
>>>>>>>>           platform_set_drvdata(pdev, afp);
>>>>>>>>
>>>>>>>> +       pci->pp.native_ecam = true;
>>>>>>>> +
>>>>>>>>           return dw_pcie_host_init(&pci->pp);
>>>>>>>>    }
>>>>>>>>
>>>>>>>> - Krishna Chaitanya.
>>>>>>>>
>>>>>>> I've already tried it. It doesn't work. Same error message as 
>>>>>>> before.
>>>>>> Can you share us dmesg logs for this change.
>>>>>>
>>>>>> - Krishna Chaitanya.
>>>>> [    3.159763] fu740-pcie e00000000.pcie: host bridge 
>>>>> /soc/pcie@...000000
>>>>> ranges:
>>>>> [    3.159853] fu740-pcie e00000000.pcie:       IO
>>>>> 0x0060080000..0x006008ffff -> 0x0060080000
>>>>> [    3.159916] fu740-pcie e00000000.pcie:      MEM
>>>>> 0x0060090000..0x007fffffff -> 0x0060090000
>>>>> [    3.159953] fu740-pcie e00000000.pcie:      MEM
>>>>> 0x2000000000..0x3fffffffff -> 0x2000000000
>>>>> [    3.160039] fu740-pcie e00000000.pcie: ECAM at [mem
>>>>> 0xdf0000000-0xdffffffff] for [bus 00-ff]
>>>>> [    3.571421] fu740-pcie e00000000.pcie: No iATU regions found
>>>>> [    3.571472] fu740-pcie e00000000.pcie: Failed to configure iATU 
>>>>> in ECAM
>>>>> mode
>>>>> [    3.571529] fu740-pcie e00000000.pcie: probe with driver 
>>>>> fu740-pcie
>>>>> failed with error -22
>>>>>
>>>>> Same as before the change. The entire log is here:
>>>>>
>>>>> https://www.w6rz.net/dmesg.txt
>>>>>
>>>> Weird that the driver still creates ECAM even after skipping it 
>>>> using the flag.
>>>> The flag is not meant for that purpose, but it should've worked 
>>>> anyway.
>>>>
>>>> Can you try this diff and share the dmesg log?
>>>>
>>>> diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c 
>>>> b/drivers/pci/controller/dwc/pcie-designware-host.c
>>>> index 20c9333bcb1c..58080928df9f 100644
>>>> --- a/drivers/pci/controller/dwc/pcie-designware-host.c
>>>> +++ b/drivers/pci/controller/dwc/pcie-designware-host.c
>>>> @@ -523,8 +523,12 @@ static int dw_pcie_host_get_resources(struct 
>>>> dw_pcie_rp *pp)
>>>>           pp->cfg0_size = resource_size(res);
>>>>           pp->cfg0_base = res->start;
>>>>
>>>> +       dev_info(dev, "%s: %d native_ecam: %d", __func__, __LINE__,
>>>> +pp->native_ecam);
>>>> +
>>>>           pp->ecam_enabled = dw_pcie_ecam_enabled(pp, res);
>>>>           if (pp->ecam_enabled) {
>>>> +               dev_info(dev, "%s: %d ECAM ENABLED", __func__, 
>>>> __LINE__);
>>>>                   ret = dw_pcie_create_ecam_window(pp, res);
>>>>                   if (ret)
>>>>                           return ret;
>>>> @@ -533,6 +537,7 @@ static int dw_pcie_host_get_resources(struct 
>>>> dw_pcie_rp *pp)
>>>>                   pp->bridge->sysdata = pp->cfg;
>>>>                   pp->cfg->priv = pp;
>>>>           } else {
>>>> +               dev_info(dev, "%s: %d ECAM DISABLED", __func__, 
>>>> __LINE__);
>>>>                   pp->va_cfg0_base = 
>>>> devm_pci_remap_cfg_resource(dev, res);
>>>>                   if (IS_ERR(pp->va_cfg0_base))
>>>>                           return PTR_ERR(pp->va_cfg0_base);
>>>>
>>>> - Mani
>>>>
>>> After testing with this patch, I must have transferred the wrong 
>>> image to
>>> the target when testing before. The "pci->pp.native_ecam = true;" 
>>> patch to
>>> pcie-fu740.c does work.
>>
>> Thanks! However, it was not a proper fix. The issue seems to be due the
>> assumption that the whole DBI space (Root Port + misc registers) lies 
>> at the
>> start of the ECAM region. This is true for Qcom, but not for all DWC 
>> glue
>> platforms.
>>
>> Krishna is working on a patch that decouples the DBI region from ECAM 
>> so that
>> the driver will continue using DBI for accessing Root Port config 
>> space and ECAM
>> for bus > 0.
>>
>> This is one step backwards for ECAM since the driver is supposed to 
>> use ECAM for
>> accessing all devices starting from the Root Port. But since DWC has 
>> clubbed
>> non-Root Port specific registers in the DBI space, we have to live 
>> with this
>> limitation as ECAM is supposed to access only Root Port specific 
>> registers.
>>
>> The patch will be posted after internal validation asap.
>>
> Hi Ron,
>
> Can you try with this series and let us know if it is helping you or
> not.
>
> https://lore.kernel.org/all/20251017-ecam_fix-v1-0-f6faa3d0edf3@oss.qualcomm.com/ 
>
>
> - Krishna Chaitanya.

The patch works good. Here's the log of PCI messages.

[    3.221506] fu740-pcie e00000000.pcie: host bridge 
/soc/pcie@...000000 ranges:
[    3.221594] fu740-pcie e00000000.pcie:       IO 
0x0060080000..0x006008ffff -> 0x0060080000
[    3.221658] fu740-pcie e00000000.pcie:      MEM 
0x0060090000..0x007fffffff -> 0x0060090000
[    3.221696] fu740-pcie e00000000.pcie:      MEM 
0x2000000000..0x3fffffffff -> 0x2000000000
[    3.221783] fu740-pcie e00000000.pcie: ECAM at [mem 
0xdf0000000-0xdffffffff] for [bus 00-ff]
[    3.323453] fu740-pcie e00000000.pcie: iATU: unroll T, 8 ob, 8 ib, 
align 4K, limit 4096G
[    3.523137] fu740-pcie e00000000.pcie: PCIe Gen.1 x8 link up
[    3.723138] fu740-pcie e00000000.pcie: PCIe Gen.3 x8 link up
[    3.827134] fu740-pcie e00000000.pcie: PCIe Gen.3 x8 link up
[    3.827445] fu740-pcie e00000000.pcie: PCI host bridge to bus 0000:00
[    3.827479] pci_bus 0000:00: root bus resource [bus 00-ff]
[    3.827503] pci_bus 0000:00: root bus resource [io 0x0000-0xffff] 
(bus address [0x60080000-0x6008ffff])
[    3.827529] pci_bus 0000:00: root bus resource [mem 
0x60090000-0x7fffffff]
[    3.827551] pci_bus 0000:00: root bus resource [mem 
0x2000000000-0x3fffffffff pref]
[    3.827750] pci 0000:00:00.0: [f15e:0000] type 01 class 0x060400 PCIe 
Root Port
[    3.827797] pci 0000:00:00.0: BAR 0 [mem 0x00000000-0x000fffff]
[    3.827821] pci 0000:00:00.0: ROM [mem 0x00000000-0x0000ffff pref]
[    3.827844] pci 0000:00:00.0: PCI bridge to [bus 01-ff]
[    3.827866] pci 0000:00:00.0:   bridge window [io 0x0000-0x0fff]
[    3.827888] pci 0000:00:00.0:   bridge window [mem 0x00000000-0x000fffff]
[    3.827912] pci 0000:00:00.0:   bridge window [mem 
0x00000000-0x000fffff 64bit pref]
[    3.827998] pci 0000:00:00.0: supports D1
[    3.828018] pci 0000:00:00.0: PME# supported from D0 D1 D3hot
[    3.829345] pci 0000:01:00.0: [1b21:2824] type 01 class 0x060400 PCIe 
Switch Upstream Port
[    3.829398] pci 0000:01:00.0: PCI bridge to [bus 00]
[    3.829424] pci 0000:01:00.0:   bridge window [io 0x0000-0x0fff]
[    3.829446] pci 0000:01:00.0:   bridge window [mem 0x00000000-0x000fffff]
[    3.829475] pci 0000:01:00.0:   bridge window [mem 
0x00000000-0x000fffff 64bit pref]
[    3.829509] pci 0000:01:00.0: enabling Extended Tags
[    3.829597] pci 0000:01:00.0: PME# supported from D0 D3hot D3cold
[    3.835150] pci 0000:01:00.0: ASPM: DT platform, enabling L0s-up 
L0s-dw L1 ASPM-L1.1 ASPM-L1.2 PCI-PM-L1.1 PCI-PM-L1.2
[    3.835188] pci 0000:01:00.0: ASPM: DT platform, enabling ClockPM
[    3.835274] pci 0000:01:00.0: bridge configuration invalid ([bus 
00-00]), reconfiguring
[    3.835433] pci 0000:02:00.0: [1b21:2824] type 01 class 0x060400 PCIe 
Switch Downstream Port
[    3.835483] pci 0000:02:00.0: PCI bridge to [bus 00]
[    3.835508] pci 0000:02:00.0:   bridge window [io 0x0000-0x0fff]
[    3.835530] pci 0000:02:00.0:   bridge window [mem 0x00000000-0x000fffff]
[    3.835557] pci 0000:02:00.0:   bridge window [mem 
0x00000000-0x000fffff 64bit pref]
[    3.835592] pci 0000:02:00.0: enabling Extended Tags
[    3.835680] pci 0000:02:00.0: PME# supported from D0 D3hot D3cold
[    3.836142] pci 0000:02:02.0: [1b21:2824] type 01 class 0x060400 PCIe 
Switch Downstream Port
[    3.836193] pci 0000:02:02.0: PCI bridge to [bus 00]
[    3.836217] pci 0000:02:02.0:   bridge window [io 0x0000-0x0fff]
[    3.836240] pci 0000:02:02.0:   bridge window [mem 0x00000000-0x000fffff]
[    3.836267] pci 0000:02:02.0:   bridge window [mem 
0x00000000-0x000fffff 64bit pref]
[    3.836302] pci 0000:02:02.0: enabling Extended Tags
[    3.836391] pci 0000:02:02.0: PME# supported from D0 D3hot D3cold
[    3.836840] pci 0000:02:03.0: [1b21:2824] type 01 class 0x060400 PCIe 
Switch Downstream Port
[    3.836890] pci 0000:02:03.0: PCI bridge to [bus 00]
[    3.836915] pci 0000:02:03.0:   bridge window [io 0x0000-0x0fff]
[    3.836936] pci 0000:02:03.0:   bridge window [mem 0x00000000-0x000fffff]
[    3.836965] pci 0000:02:03.0:   bridge window [mem 
0x00000000-0x000fffff 64bit pref]
[    3.836999] pci 0000:02:03.0: enabling Extended Tags
[    3.837088] pci 0000:02:03.0: PME# supported from D0 D3hot D3cold
[    3.837513] pci 0000:02:04.0: [1b21:2824] type 01 class 0x060400 PCIe 
Switch Downstream Port
[    3.837563] pci 0000:02:04.0: PCI bridge to [bus 00]
[    3.837588] pci 0000:02:04.0:   bridge window [io 0x0000-0x0fff]
[    3.837610] pci 0000:02:04.0:   bridge window [mem 0x00000000-0x000fffff]
[    3.837638] pci 0000:02:04.0:   bridge window [mem 
0x00000000-0x000fffff 64bit pref]
[    3.837672] pci 0000:02:04.0: enabling Extended Tags
[    3.837760] pci 0000:02:04.0: PME# supported from D0 D3hot D3cold
[    3.838260] pci 0000:02:08.0: [1b21:2824] type 01 class 0x060400 PCIe 
Switch Downstream Port
[    3.838311] pci 0000:02:08.0: PCI bridge to [bus 00]
[    3.838336] pci 0000:02:08.0:   bridge window [io 0x0000-0x0fff]
[    3.838358] pci 0000:02:08.0:   bridge window [mem 0x00000000-0x000fffff]
[    3.838386] pci 0000:02:08.0:   bridge window [mem 
0x00000000-0x000fffff 64bit pref]
[    3.838421] pci 0000:02:08.0: enabling Extended Tags
[    3.838509] pci 0000:02:08.0: PME# supported from D0 D3hot D3cold
[    3.839437] pci 0000:02:00.0: bridge configuration invalid ([bus 
00-00]), reconfiguring
[    3.839472] pci 0000:02:02.0: bridge configuration invalid ([bus 
00-00]), reconfiguring
[    3.839501] pci 0000:02:03.0: bridge configuration invalid ([bus 
00-00]), reconfiguring
[    3.839530] pci 0000:02:04.0: bridge configuration invalid ([bus 
00-00]), reconfiguring
[    3.839557] pci 0000:02:08.0: bridge configuration invalid ([bus 
00-00]), reconfiguring
[    3.839788] pci_bus 0000:03: busn_res: [bus 03-ff] end is updated to 03
[    3.839964] pci 0000:04:00.0: [1b21:1142] type 00 class 0x0c0330 PCIe 
Legacy Endpoint
[    3.840056] pci 0000:04:00.0: BAR 0 [mem 0x00000000-0x00007fff 64bit]
[    3.840181] pci 0000:04:00.0: PME# supported from D3cold
[    3.847149] pci 0000:04:00.0: ASPM: DT platform, enabling L0s-up 
L0s-dw L1 ASPM-L1.1 ASPM-L1.2 PCI-PM-L1.1 PCI-PM-L1.2
[    3.847190] pci 0000:04:00.0: ASPM: DT platform, enabling ClockPM
[    3.847225] pci_bus 0000:04: busn_res: [bus 04-ff] end is updated to 04
[    3.847421] pci_bus 0000:05: busn_res: [bus 05-ff] end is updated to 05
[    3.847743] pci 0000:06:00.0: [15b7:5002] type 00 class 0x010802 PCIe 
Endpoint
[    3.847823] pci 0000:06:00.0: BAR 0 [mem 0x00000000-0x00003fff 64bit]
[    3.847852] pci 0000:06:00.0: BAR 4 [mem 0x00000000-0x000000ff 64bit]
[    3.860322] pci 0000:06:00.0: ASPM: DT platform, enabling L0s-up 
L0s-dw L1 ASPM-L1.1 ASPM-L1.2 PCI-PM-L1.1 PCI-PM-L1.2
[    3.860362] pci 0000:06:00.0: ASPM: DT platform, enabling ClockPM
[    3.860414] pci_bus 0000:06: busn_res: [bus 06-ff] end is updated to 06
[    3.860613] pci_bus 0000:07: busn_res: [bus 07-ff] end is updated to 07
[    3.860645] pci_bus 0000:02: busn_res: [bus 02-ff] end is updated to 07
[    3.860671] pci_bus 0000:01: busn_res: [bus 01-ff] end is updated to 07
[    3.860751] pci 0000:00:00.0: BAR 0 [mem 0x60100000-0x601fffff]: assigned
[    3.860781] pci 0000:00:00.0: bridge window [mem 
0x60200000-0x606fffff]: assigned
[    3.860808] pci 0000:00:00.0: bridge window [mem 
0x2000000000-0x20004fffff 64bit pref]: assigned
[    3.860834] pci 0000:00:00.0: ROM [mem 0x60090000-0x6009ffff pref]: 
assigned
[    3.860857] pci 0000:00:00.0: bridge window [io 0x1000-0x5fff]: assigned
[    3.860886] pci 0000:01:00.0: bridge window [mem 
0x60200000-0x606fffff]: assigned
[    3.860912] pci 0000:01:00.0: bridge window [mem 
0x2000000000-0x20004fffff 64bit pref]: assigned
[    3.860937] pci 0000:01:00.0: bridge window [io 0x1000-0x5fff]: assigned
[    3.860975] pci 0000:02:00.0: bridge window [mem 
0x60200000-0x602fffff]: assigned
[    3.861001] pci 0000:02:00.0: bridge window [mem 
0x2000000000-0x20000fffff 64bit pref]: assigned
[    3.861026] pci 0000:02:02.0: bridge window [mem 
0x60300000-0x603fffff]: assigned
[    3.861050] pci 0000:02:02.0: bridge window [mem 
0x2000100000-0x20001fffff 64bit pref]: assigned
[    3.861075] pci 0000:02:03.0: bridge window [mem 
0x60400000-0x604fffff]: assigned
[    3.861099] pci 0000:02:03.0: bridge window [mem 
0x2000200000-0x20002fffff 64bit pref]: assigned
[    3.861124] pci 0000:02:04.0: bridge window [mem 
0x60500000-0x605fffff]: assigned
[    3.861148] pci 0000:02:04.0: bridge window [mem 
0x2000300000-0x20003fffff 64bit pref]: assigned
[    3.861173] pci 0000:02:08.0: bridge window [mem 
0x60600000-0x606fffff]: assigned
[    3.861197] pci 0000:02:08.0: bridge window [mem 
0x2000400000-0x20004fffff 64bit pref]: assigned
[    3.861221] pci 0000:02:00.0: bridge window [io 0x1000-0x1fff]: assigned
[    3.861242] pci 0000:02:02.0: bridge window [io 0x2000-0x2fff]: assigned
[    3.861264] pci 0000:02:03.0: bridge window [io 0x3000-0x3fff]: assigned
[    3.861285] pci 0000:02:04.0: bridge window [io 0x4000-0x4fff]: assigned
[    3.861306] pci 0000:02:08.0: bridge window [io 0x5000-0x5fff]: assigned
[    3.861332] pci 0000:02:00.0: PCI bridge to [bus 03]
[    3.861353] pci 0000:02:00.0:   bridge window [io 0x1000-0x1fff]
[    3.861378] pci 0000:02:00.0:   bridge window [mem 0x60200000-0x602fffff]
[    3.861401] pci 0000:02:00.0:   bridge window [mem 
0x2000000000-0x20000fffff 64bit pref]
[    3.861431] pci 0000:04:00.0: BAR 0 [mem 0x60300000-0x60307fff 
64bit]: assigned
[    3.861469] pci 0000:02:02.0: PCI bridge to [bus 04]
[    3.861489] pci 0000:02:02.0:   bridge window [io 0x2000-0x2fff]
[    3.861512] pci 0000:02:02.0:   bridge window [mem 0x60300000-0x603fffff]
[    3.861534] pci 0000:02:02.0:   bridge window [mem 
0x2000100000-0x20001fffff 64bit pref]
[    3.861561] pci 0000:02:03.0: PCI bridge to [bus 05]
[    3.861581] pci 0000:02:03.0:   bridge window [io 0x3000-0x3fff]
[    3.861603] pci 0000:02:03.0:   bridge window [mem 0x60400000-0x604fffff]
[    3.861625] pci 0000:02:03.0:   bridge window [mem 
0x2000200000-0x20002fffff 64bit pref]
[    3.861657] pci 0000:06:00.0: BAR 0 [mem 0x60500000-0x60503fff 
64bit]: assigned
[    3.861692] pci 0000:06:00.0: BAR 4 [mem 0x60504000-0x605040ff 
64bit]: assigned
[    3.861727] pci 0000:02:04.0: PCI bridge to [bus 06]
[    3.861747] pci 0000:02:04.0:   bridge window [io 0x4000-0x4fff]
[    3.861769] pci 0000:02:04.0:   bridge window [mem 0x60500000-0x605fffff]
[    3.861791] pci 0000:02:04.0:   bridge window [mem 
0x2000300000-0x20003fffff 64bit pref]
[    3.861819] pci 0000:02:08.0: PCI bridge to [bus 07]
[    3.861838] pci 0000:02:08.0:   bridge window [io 0x5000-0x5fff]
[    3.861861] pci 0000:02:08.0:   bridge window [mem 0x60600000-0x606fffff]
[    3.861883] pci 0000:02:08.0:   bridge window [mem 
0x2000400000-0x20004fffff 64bit pref]
[    3.861910] pci 0000:01:00.0: PCI bridge to [bus 02-07]
[    3.861929] pci 0000:01:00.0:   bridge window [io 0x1000-0x5fff]
[    3.861951] pci 0000:01:00.0:   bridge window [mem 0x60200000-0x606fffff]
[    3.861973] pci 0000:01:00.0:   bridge window [mem 
0x2000000000-0x20004fffff 64bit pref]
[    3.862000] pci 0000:00:00.0: PCI bridge to [bus 01-07]
[    3.862019] pci 0000:00:00.0:   bridge window [io 0x1000-0x5fff]
[    3.862040] pci 0000:00:00.0:   bridge window [mem 0x60200000-0x606fffff]
[    3.862061] pci 0000:00:00.0:   bridge window [mem 
0x2000000000-0x20004fffff 64bit pref]
[    3.862087] pci_bus 0000:00: resource 4 [io  0x0000-0xffff]
[    3.862107] pci_bus 0000:00: resource 5 [mem 0x60090000-0x7fffffff]
[    3.862126] pci_bus 0000:00: resource 6 [mem 
0x2000000000-0x3fffffffff pref]
[    3.862147] pci_bus 0000:01: resource 0 [io  0x1000-0x5fff]
[    3.862166] pci_bus 0000:01: resource 1 [mem 0x60200000-0x606fffff]
[    3.862185] pci_bus 0000:01: resource 2 [mem 
0x2000000000-0x20004fffff 64bit pref]
[    3.862208] pci_bus 0000:02: resource 0 [io  0x1000-0x5fff]
[    3.862227] pci_bus 0000:02: resource 1 [mem 0x60200000-0x606fffff]
[    3.862246] pci_bus 0000:02: resource 2 [mem 
0x2000000000-0x20004fffff 64bit pref]
[    3.862269] pci_bus 0000:03: resource 0 [io  0x1000-0x1fff]
[    3.862288] pci_bus 0000:03: resource 1 [mem 0x60200000-0x602fffff]
[    3.862307] pci_bus 0000:03: resource 2 [mem 
0x2000000000-0x20000fffff 64bit pref]
[    3.862330] pci_bus 0000:04: resource 0 [io  0x2000-0x2fff]
[    3.862349] pci_bus 0000:04: resource 1 [mem 0x60300000-0x603fffff]
[    3.862368] pci_bus 0000:04: resource 2 [mem 
0x2000100000-0x20001fffff 64bit pref]
[    3.862391] pci_bus 0000:05: resource 0 [io  0x3000-0x3fff]
[    3.862410] pci_bus 0000:05: resource 1 [mem 0x60400000-0x604fffff]
[    3.862430] pci_bus 0000:05: resource 2 [mem 
0x2000200000-0x20002fffff 64bit pref]
[    3.862453] pci_bus 0000:06: resource 0 [io  0x4000-0x4fff]
[    3.862472] pci_bus 0000:06: resource 1 [mem 0x60500000-0x605fffff]
[    3.862492] pci_bus 0000:06: resource 2 [mem 
0x2000300000-0x20003fffff 64bit pref]
[    3.862514] pci_bus 0000:07: resource 0 [io  0x5000-0x5fff]
[    3.862533] pci_bus 0000:07: resource 1 [mem 0x60600000-0x606fffff]
[    3.862553] pci_bus 0000:07: resource 2 [mem 
0x2000400000-0x20004fffff 64bit pref]
[    3.863320] pcieport 0000:00:00.0: PME: Signaling with IRQ 36
[    3.864092] pcieport 0000:00:00.0: AER: enabled with IRQ 36
[    3.864563] pcieport 0000:01:00.0: enabling device (0000 -> 0003)
[    3.864769] pcieport 0000:02:00.0: enabling device (0000 -> 0003)
[    3.865381] pcieport 0000:02:02.0: enabling device (0000 -> 0003)
[    3.866107] pcieport 0000:02:03.0: enabling device (0000 -> 0003)
[    3.866669] pcieport 0000:02:04.0: enabling device (0000 -> 0003)
[    3.867371] pcieport 0000:02:08.0: enabling device (0000 -> 0003)
[    3.867885] pci 0000:04:00.0: enabling device (0000 -> 0002)

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