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kmem_cache_alloc fail with unable to handle paging request after pci hotplug remove.

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Mathias Nyman

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Jul 4, 2016, 10:18:53 AM7/4/16
to Rafael J. Wysocki, Bjorn Helgaas, Andrew Morton, linu...@kvack.org, LKML, linu...@vger.kernel.org, ACPI Devel Maling List, Kirill A. Shutemov, USB, ace...@gmail.com
Hi

AceLan Kao can get his DELL XPS 13 laptop to hang by plugging/un-plugging
a USB 3.1 key via thunderbolt port.

Allocating memory fails after this, always pointing to NULL pointer or
page request failing in get_freepointer() called by kmalloc/kmem_cache_alloc.

Unplugging a usb type-c device from the thunderbolt port on Alpine Ridge based
systems like this one will hotplug remove PCI bridges together with the USB xhci
controller behind them.

[ 61.969221] usb 4-1: USB disconnect, device number 2
[ 61.992892] xhci_hcd 0000:39:00.0: Host not halted after 16000 microseconds.
[ 61.994002] xhci_hcd 0000:39:00.0: USB bus 4 deregistered
[ 61.994013] xhci_hcd 0000:39:00.0: remove, state 4
[ 61.994022] usb usb3: USB disconnect, device number 1
[ 61.995317] xhci_hcd 0000:39:00.0: USB bus 3 deregistered
[ 61.995949] pci_bus 0000:03: busn_res: [bus 03] is released
[ 61.996022] pci_bus 0000:04: busn_res: [bus 04-38] is released
[ 62.016460] pci_bus 0000:39: busn_res: [bus 39] is released
[ 62.016515] pci_bus 0000:02: busn_res: [bus 02-39] is released
[ 62.103618] BUG: unable to handle kernel NULL pointer dereference at 0000000000000001
[ 62.103651] IP: [<ffffffff811eb67b>] kmem_cache_alloc_trace+0x7b/0x1f0
[ 62.103681] PGD 0
[ 62.103689] Oops: 0000 [#1] SMP
[ 62.103702] Modules linked in:

[ 62.104303] CPU: 3 PID: 993 Comm: Xorg Tainted: G OE 4.4.0-28-generic #47-Ubuntu
[ 62.104345] Hardware name: Dell Inc. XPS 13 9360/ , BIOS 0.1.7 06/22/2016
[ 62.104383] task: ffff88006f3a8000 ti: ffff880078fa0000 task.ti: ffff880078fa0000
[ 62.104420] RIP: 0010:[<ffffffff811eb67b>] [<ffffffff811eb67b>] kmem_cache_alloc_trace+0x7b/0x1f0
[ 62.104468] RSP: 0018:ffff880078fa3c70 EFLAGS: 00010202
[ 62.104495] RAX: 0000000000000000 RBX: 00000000024000c0 RCX: 0000000000010d87
[ 62.104530] RDX: 0000000000010d86 RSI: 00000000024000c0 RDI: 0000000000019f80
[ 62.104565] RBP: ffff880078fa3cb0 R08: ffff88017e599f80 R09: ffff880179801b00
[ 62.104603] R10: 0000000000000001 R11: 000000000000007c R12: 00000000024000c0
[ 62.104641] R13: ffffffffc00c1b1a R14: ffff88017485a000 R15: ffff880179801b00
[ 62.104680] FS: 00007fe6a0241a00(0000) GS:ffff88017e580000(0000) knlGS:0000000000000000
[ 62.104722] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 62.104752] CR2: 0000000000000001 CR3: 0000000177234000 CR4: 00000000003406e0
[ 62.104789] Stack:
[ 62.104801] ffff880078fa3cd8 ffffffff813ec8ee 0000000000000028 ffff8801759d4fd8
[ 62.104847] ffff8801785d8b00 ffff880174f9be60 ffff88017485a000 000000000000007c
[ 62.104892] ffff880078fa3cd8 ffffffffc00c1b1a ffff8801759d4fc0 ffff880174f9be00
[ 62.104938] Call Trace:
[ 62.104956] [<ffffffff813ec8ee>] ? idr_alloc+0x9e/0x110
[ 62.105005] [<ffffffffc00c1b1a>] drm_vma_node_allow+0x2a/0xc0 [drm]
[ 62.105047] [<ffffffffc00a7d43>] drm_gem_handle_create_tail+0xc3/0x190 [drm]
[ 62.105088] [<ffffffffc00a7e45>] drm_gem_handle_create+0x35/0x40 [drm]
[ 62.105145] [<ffffffffc01cf531>] i915_gem_userptr_ioctl+0x271/0x350 [i915_bpo]
[ 62.105190] [<ffffffffc00a8742>] drm_ioctl+0x152/0x540 [drm]
[ 62.105235] [<ffffffffc01cf2c0>] ? __i915_gem_userptr_get_pages_worker+0x320/0x320 [i915_bpo]
[ 62.105262] [<ffffffff81220b6f>] do_vfs_ioctl+0x29f/0x490
[ 62.105281] [<ffffffff81701610>] ? __sys_recvmsg+0x80/0x90
[ 62.105298] [<ffffffff81220dd9>] SyS_ioctl+0x79/0x90
[ 62.105319] [<ffffffff818276b2>] entry_SYSCALL_64_fastpath+0x16/0x71
[ 62.105346] Code: 08 65 4c 03 05 2f eb e1 7e 49 83 78 10 00 4d 8b 10 0f 84 21 01 00 00 4d 85 d2 0f 84 18 01 00 00 49 63 41 20 48 8d 4a 01 49 8b 39 <49> 8b 1c 02 4c 89 d0 65 48 0f c7 0f 0f 94 c0 84 c0 74 bb 49 63
[ 62.105520] RIP [<ffffffff811eb67b>] kmem_cache_alloc_trace+0x7b/0x1f0
[ 62.105543] RSP <ffff880078fa3c70>
[ 62.105554] CR2: 0000000000000001
[ 62.113016] ---[ end trace 4f9991d2eebd1637 ]---

(gdb) list *(kmem_cache_alloc_trace+0x7b)
0xffffffff811eb67b is in kmem_cache_alloc_trace (/build/linux-BvkamA/linux-4.4.0/mm/slub.c:247).
242 return 1;
243 }
244
245 static inline void *get_freepointer(struct kmem_cache *s, void *object)
246 {
247 return *(void **)(object + s->offset);
248 }
249
250 static void prefetch_freepointer(const struct kmem_cache *s, void *object)
251 {

More logs can be found at
https://bugzilla.kernel.org/show_bug.cgi?id=120241

This log was from a 4.4 based ubuntu kernel, but the same issue was reproduced
with 4.7-rc5. Call trace often point to various graphics related drivers, but
also xhci and acpi_hotplug_work_fn.
Only thing they have in common is that they fail while trying to allocate memory.

A log of acpi_hotplug_work_fn failing to allocate memory while removing pci
devices:
https://bugzilla.kernel.org/attachment.cgi?id=221561

I've been looking at this from xhci perspective, but it starts to go too deep
into mm, pci hotplug etc for my understanding.

Any ideas?

-Mathias

Rafael J. Wysocki

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Jul 4, 2016, 10:25:48 AM7/4/16
to Mathias Nyman, Rafael J. Wysocki, Bjorn Helgaas, Andrew Morton, Linux Memory Management List, LKML, Linux PCI, ACPI Devel Maling List, Kirill A. Shutemov, USB, ace...@gmail.com
Are you able to reproduce this by unplugging and replugging the entire
Thunderbolt link?

Mathias Nyman

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Jul 4, 2016, 10:57:22 AM7/4/16
to Rafael J. Wysocki, Rafael J. Wysocki, Bjorn Helgaas, Andrew Morton, Linux Memory Management List, LKML, Linux PCI, ACPI Devel Maling List, Kirill A. Shutemov, USB, ace...@gmail.com
As I understood it should be gone as well,
I can't reproduce this myself, I have a slightly different DELL XPS
than AceLan Kao. For me lspci looks like this:

** lspci before usb remove: **

-[0000:00]-+-00.0
+-01.0-[01]----00.0
+-02.0
+-04.0
+-14.0
+-14.2
+-15.0
+-15.1
+-16.0
+-17.0
+-1c.0-[02]----00.0
+-1c.1-[03]----00.0
+-1d.0-[04]--
+-1d.4-[05]--
+-1d.6-[06-3e]----00.0-[07-3e]--+-00.0-[08]--
| +-01.0-[09-3d]--
| \-02.0-[3e]----00.0
+-1f.0
+-1f.2
+-1f.3
\-1f.4

00:00.0 Host bridge: Intel Corporation Sky Lake Host Bridge/DRAM Registers (rev 07)
00:01.0 PCI bridge: Intel Corporation Sky Lake PCIe Controller (x16) (rev 07)
00:02.0 VGA compatible controller: Intel Corporation Skylake Integrated Graphics (rev 06)
00:04.0 Signal processing controller: Intel Corporation Skylake Processor Thermal Subsystem (rev 07)
00:14.0 USB controller: Intel Corporation Sunrise Point-H USB 3.0 xHCI Controller (rev 31)
00:14.2 Signal processing controller: Intel Corporation Sunrise Point-H Thermal subsystem (rev 31)
00:15.0 Signal processing controller: Intel Corporation Sunrise Point-H LPSS I2C Controller #0 (rev 31)
00:15.1 Signal processing controller: Intel Corporation Sunrise Point-H LPSS I2C Controller #1 (rev 31)
00:16.0 Communication controller: Intel Corporation Sunrise Point-H CSME HECI #1 (rev 31)
00:17.0 SATA controller: Intel Corporation Sunrise Point-H SATA Controller [AHCI mode] (rev 31)
00:1c.0 PCI bridge: Intel Corporation Sunrise Point-H PCI Express Root Port #1 (rev f1)
00:1c.1 PCI bridge: Intel Corporation Sunrise Point-H PCI Express Root Port #2 (rev f1)
00:1d.0 PCI bridge: Intel Corporation Sunrise Point-H PCI Express Root Port #9 (rev f1)
00:1d.4 PCI bridge: Intel Corporation Sunrise Point-H PCI Express Root Port #13 (rev f1)
00:1d.6 PCI bridge: Intel Corporation Sunrise Point-H PCI Express Root Port #15 (rev f1)
00:1f.0 ISA bridge: Intel Corporation Sunrise Point-H LPC Controller (rev 31)
00:1f.2 Memory controller: Intel Corporation Sunrise Point-H PMC (rev 31)
00:1f.3 Audio device: Intel Corporation Sunrise Point-H HD Audio (rev 31)
00:1f.4 SMBus: Intel Corporation Sunrise Point-H SMBus (rev 31)
01:00.0 3D controller: NVIDIA Corporation GM107M [GeForce GTX 960M] (rev a2)
02:00.0 Network controller: Broadcom Corporation BCM43602 802.11ac Wireless LAN SoC (rev 01)
03:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS525A PCI Express Card Reader (rev 01)
06:00.0 PCI bridge: Intel Corporation Device 1576
07:00.0 PCI bridge: Intel Corporation Device 1576
07:01.0 PCI bridge: Intel Corporation Device 1576
07:02.0 PCI bridge: Intel Corporation Device 1576
3e:00.0 USB controller: Intel Corporation Device 15b5

** lspci after unplug **

-[0000:00]-+-00.0
+-01.0-[01]----00.0
+-02.0
+-04.0
+-14.0
+-14.2
+-15.0
+-15.1
+-16.0
+-17.0
+-1c.0-[02]----00.0
+-1c.1-[03]----00.0
+-1d.0-[04]--
+-1d.4-[05]--
+-1d.6-[06-3e]--
+-1f.0
+-1f.2
+-1f.3
\-1f.4

00:00.0 Host bridge: Intel Corporation Sky Lake Host Bridge/DRAM Registers (rev 07)
00:01.0 PCI bridge: Intel Corporation Sky Lake PCIe Controller (x16) (rev 07)
00:02.0 VGA compatible controller: Intel Corporation Skylake Integrated Graphics (rev 06)
00:04.0 Signal processing controller: Intel Corporation Skylake Processor Thermal Subsystem (rev 07)
00:14.0 USB controller: Intel Corporation Sunrise Point-H USB 3.0 xHCI Controller (rev 31)
00:14.2 Signal processing controller: Intel Corporation Sunrise Point-H Thermal subsystem (rev 31)
00:15.0 Signal processing controller: Intel Corporation Sunrise Point-H LPSS I2C Controller #0 (rev 31)
00:15.1 Signal processing controller: Intel Corporation Sunrise Point-H LPSS I2C Controller #1 (rev 31)
00:16.0 Communication controller: Intel Corporation Sunrise Point-H CSME HECI #1 (rev 31)
00:17.0 SATA controller: Intel Corporation Sunrise Point-H SATA Controller [AHCI mode] (rev 31)
00:1c.0 PCI bridge: Intel Corporation Sunrise Point-H PCI Express Root Port #1 (rev f1)
00:1c.1 PCI bridge: Intel Corporation Sunrise Point-H PCI Express Root Port #2 (rev f1)
00:1d.0 PCI bridge: Intel Corporation Sunrise Point-H PCI Express Root Port #9 (rev f1)
00:1d.4 PCI bridge: Intel Corporation Sunrise Point-H PCI Express Root Port #13 (rev f1)
00:1d.6 PCI bridge: Intel Corporation Sunrise Point-H PCI Express Root Port #15 (rev f1)
00:1f.0 ISA bridge: Intel Corporation Sunrise Point-H LPC Controller (rev 31)
00:1f.2 Memory controller: Intel Corporation Sunrise Point-H PMC (rev 31)
00:1f.3 Audio device: Intel Corporation Sunrise Point-H HD Audio (rev 31)
00:1f.4 SMBus: Intel Corporation Sunrise Point-H SMBus (rev 31)
01:00.0 3D controller: NVIDIA Corporation GM107M [GeForce GTX 960M] (rev a2)
02:00.0 Network controller: Broadcom Corporation BCM43602 802.11ac Wireless LAN SoC (rev 01)
03:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS525A PCI Express Card Reader (rev 01)

-Mathias

Lukas Wunner

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Jul 4, 2016, 11:17:22 AM7/4/16
to Mathias Nyman, Rafael J. Wysocki, Bjorn Helgaas, Andrew Morton, Linux Memory Management List, LKML, Linux PCI, ACPI Devel Maling List, Kirill A. Shutemov, USB, ace...@gmail.com
On Mon, Jul 04, 2016 at 06:04:42PM +0300, Mathias Nyman wrote:
> On 04.07.2016 17:25, Rafael J. Wysocki wrote:
> > On Mon, Jul 4, 2016 at 4:26 PM, Mathias Nyman <mathia...@linux.intel.com> wrote:
> > > AceLan Kao can get his DELL XPS 13 laptop to hang by plugging/un-plugging
> > > a USB 3.1 key via thunderbolt port.
> > >
> > > Allocating memory fails after this, always pointing to NULL pointer or
> > > page request failing in get_freepointer() called by
> > > kmalloc/kmem_cache_alloc.
> > >
> > > Unplugging a usb type-c device from the thunderbolt port on Alpine Ridge
> > > based systems like this one will hotplug remove PCI bridges together
> > > with the USB xhci controller behind them.

Yes, that matches with the lspci output you've posted, the whole
Thunderbolt controller is gone after unplug. Perhaps it's powered
down? What does "lspci -vvvv -s 00:1d.6" say? (Does the root port
still have a link to the Thunderbolt controller?)

Best regards,

Lukas

Mathias Nyman

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Jul 4, 2016, 11:38:48 AM7/4/16
to Lukas Wunner, Rafael J. Wysocki, Bjorn Helgaas, Andrew Morton, Linux Memory Management List, LKML, Linux PCI, ACPI Devel Maling List, Kirill A. Shutemov, USB, ace...@gmail.com
"lspci -vvvv -s 00:1d.6" after unplug (on my working DELL XPS)


00:1d.6 PCI bridge: Intel Corporation Sunrise Point-H PCI Express Root Port #15 (rev f1) (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
Interrupt: pin C routed to IRQ 18
Bus: primary=00, secondary=06, subordinate=3e, sec-latency=0
I/O behind bridge: 00002000-00002fff
Memory behind bridge: c4000000-da0fffff
Prefetchable memory behind bridge: 0000000080000000-00000000a1ffffff
Secondary status: 66MHz- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort+ <SERR- <PERR-
BridgeCtl: Parity- SERR- NoISA- VGA- MAbort- >Reset- FastB2B-
PriDiscTmr- SecDiscTmr- DiscTmrStat- DiscTmrSERREn-
Capabilities: [40] Express (v2) Root Port (Slot+), MSI 00
DevCap: MaxPayload 256 bytes, PhantFunc 0
ExtTag- RBE+
DevCtl: Report errors: Correctable- Non-Fatal- Fatal- Unsupported-
RlxdOrd- ExtTag- PhantFunc- AuxPwr- NoSnoop-
MaxPayload 128 bytes, MaxReadReq 128 bytes
DevSta: CorrErr+ UncorrErr- FatalErr- UnsuppReq- AuxPwr+ TransPend-
LnkCap: Port #15, Speed 8GT/s, Width x2, ASPM L0s L1, Exit Latency L0s <1us, L1 <16us
ClockPM- Surprise- LLActRep+ BwNot+ ASPMOptComp+
LnkCtl: ASPM Disabled; RCB 64 bytes Disabled- CommClk+
ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
LnkSta: Speed 2.5GT/s, Width x2, TrErr- Train- SlotClk+ DLActive- BWMgmt+ ABWMgmt-
SltCap: AttnBtn- PwrCtrl- MRL- AttnInd- PwrInd- HotPlug+ Surprise+
Slot #18, PowerLimit 25.000W; Interlock- NoCompl+
SltCtl: Enable: AttnBtn- PwrFlt- MRL- PresDet+ CmdCplt- HPIrq- LinkChg-
Control: AttnInd Unknown, PwrInd Unknown, Power- Interlock-
SltSta: Status: AttnBtn- PowerFlt- MRL- CmdCplt- PresDet- Interlock-
Changed: MRL- PresDet- LinkState+
RootCtl: ErrCorrectable- ErrNon-Fatal- ErrFatal- PMEIntEna- CRSVisible-
RootCap: CRSVisible-
RootSta: PME ReqID 0000, PMEStatus- PMEPending-
DevCap2: Completion Timeout: Range ABC, TimeoutDis+, LTR+, OBFF Not Supported ARIFwd+
DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis-, LTR-, OBFF Disabled ARIFwd-
LnkCtl2: Target Link Speed: 2.5GT/s, EnterCompliance- SpeedDis-
Transmit Margin: Normal Operating Range, EnterModifiedCompliance- ComplianceSOS-
Compliance De-emphasis: -6dB
LnkSta2: Current De-emphasis Level: -3.5dB, EqualizationComplete-, EqualizationPhase1-
EqualizationPhase2-, EqualizationPhase3-, LinkEqualizationRequest-
Capabilities: [80] MSI: Enable- Count=1/1 Maskable- 64bit-
Address: 00000000 Data: 0000
Capabilities: [90] Subsystem: Dell Sunrise Point-H PCI Express Root Port
Capabilities: [a0] Power Management version 3
Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0+,D1-,D2-,D3hot+,D3cold+)
Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
Capabilities: [100 v1] Advanced Error Reporting
UESta: DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- RxOF- MalfTLP- ECRC- UnsupReq- ACSViol-
UEMsk: DLP- SDES- TLP- FCP- CmpltTO+ CmpltAbrt- UnxCmplt+ RxOF- MalfTLP- ECRC- UnsupReq- ACSViol-
UESvrt: DLP+ SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- RxOF+ MalfTLP+ ECRC- UnsupReq- ACSViol-
CESta: RxErr+ BadTLP- BadDLLP- Rollover+ Timeout+ NonFatalErr+
CEMsk: RxErr- BadTLP- BadDLLP- Rollover- Timeout- NonFatalErr+
AERCap: First Error Pointer: 00, GenCap- CGenEn- ChkCap- ChkEn-
Capabilities: [140 v1] Access Control Services
ACSCap: SrcValid+ TransBlk+ ReqRedir+ CmpltRedir+ UpstreamFwd- EgressCtrl- DirectTrans-
ACSCtl: SrcValid- TransBlk- ReqRedir- CmpltRedir- UpstreamFwd- EgressCtrl- DirectTrans-
Capabilities: [200 v1] L1 PM Substates
L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ L1_PM_Substates+
PortCommonModeRestoreTime=40us PortTPowerOnTime=10us
Capabilities: [220 v1] #19
Kernel driver in use: pcieport
Kernel modules: shpchp


AceLan Kao, can you confirm your lspci output looks similar on the failing DELL XPS?

-Mathias

AceLan Kao

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Jul 4, 2016, 11:00:38 PM7/4/16
to Mathias Nyman, Lukas Wunner, Rafael J. Wysocki, Bjorn Helgaas, Andrew Morton, Linux Memory Management List, LKML, Linux PCI, ACPI Devel Maling List, Kirill A. Shutemov, USB
Hi,

These are logs from my machine.

*** Before plug-in the USB key

u@u-XPS-13-9xxx:~$ sudo lspci -vvvv -s 00:1c.0
00:1c.0 PCI bridge: Intel Corporation Device 9d10 (rev f1) (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
Interrupt: pin A routed to IRQ 16
Bus: primary=00, secondary=01, subordinate=39, sec-latency=0
I/O behind bridge: 00002000-00002fff
Memory behind bridge: c4000000-da0fffff
Prefetchable memory behind bridge: 00000000a0000000-00000000c1ffffff
Secondary status: 66MHz- FastB2B- ParErr- DEVSEL=fast >TAbort-
<TAbort- <MAbort+ <SERR- <PERR-
BridgeCtl: Parity- SERR- NoISA- VGA- MAbort- >Reset- FastB2B-
PriDiscTmr- SecDiscTmr- DiscTmrStat- DiscTmrSERREn-
Capabilities: [40] Express (v2) Root Port (Slot+), MSI 00
DevCap: MaxPayload 128 bytes, PhantFunc 0
ExtTag- RBE+
DevCtl: Report errors: Correctable- Non-Fatal- Fatal-
Unsupported-
RlxdOrd- ExtTag- PhantFunc- AuxPwr- NoSnoop-
MaxPayload 128 bytes, MaxReadReq 128 bytes
DevSta: CorrErr- UncorrErr- FatalErr- UnsuppReq-
AuxPwr+ TransPend-
LnkCap: Port #1, Speed 8GT/s, Width x2, ASPM L1, Exit
Latency L0s unlimited, L1 <16us
ClockPM- Surprise- LLActRep+ BwNot+ ASPMOptComp+
LnkCtl: ASPM L1 Enabled; RCB 64 bytes Disabled- CommClk-
ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
LnkSta: Speed 2.5GT/s, Width x0, TrErr- Train-
SlotClk+ DLActive- BWMgmt- ABWMgmt-
SltCap: AttnBtn- PwrCtrl- MRL- AttnInd- PwrInd-
HotPlug+ Surprise+
Slot #4, PowerLimit 25.000W; Interlock- NoCompl+
SltCtl: Enable: AttnBtn- PwrFlt- MRL- PresDet+
CmdCplt- HPIrq- LinkChg-
Control: AttnInd Unknown, PwrInd Unknown,
Power- Interlock-
SltSta: Status: AttnBtn- PowerFlt- MRL- CmdCplt-
PresDet- Interlock-
Changed: MRL- PresDet- LinkState-
RootCtl: ErrCorrectable- ErrNon-Fatal- ErrFatal-
PMEIntEna- CRSVisible-
RootCtl: ErrCorrectable- ErrNon-Fatal- ErrFatal-
PMEIntEna- CRSVisible-
RootCap: CRSVisible-
RootSta: PME ReqID 0000, PMEStatus- PMEPending-
DevCap2: Completion Timeout: Range ABC, TimeoutDis+,
LTR+, OBFF Not Supported ARIFwd+
DevCtl2: Completion Timeout: 50us to 50ms,
TimeoutDis-, LTR-, OBFF Disabled ARIFwd-
LnkCtl2: Target Link Speed: 8GT/s, EnterCompliance- SpeedDis-
Transmit Margin: Normal Operating Range,
EnterModifiedCompliance- ComplianceSOS-
Compliance De-emphasis: -6dB
LnkSta2: Current De-emphasis Level: -3.5dB,
EqualizationComplete-, EqualizationPhase1-
EqualizationPhase2-, EqualizationPhase3-,
LinkEqualizationRequest-
Capabilities: [80] MSI: Enable- Count=1/1 Maskable- 64bit-
Address: 00000000 Data: 0000
Capabilities: [90] Subsystem: Dell Device 075b
Capabilities: [a0] Power Management version 3
Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA
PME(D0+,D1-,D2-,D3hot+,D3cold+)
Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
Capabilities: [100 v1] Advanced Error Reporting
UESta: DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt-
UnxCmplt- RxOF- MalfTLP- ECRC- UnsupReq- ACSViol-
UEMsk: DLP- SDES- TLP- FCP- CmpltTO+ CmpltAbrt-
UnxCmplt+ RxOF- MalfTLP- ECRC- UnsupReq- ACSViol-
UESvrt: DLP+ SDES- TLP- FCP- CmpltTO- CmpltAbrt-
UnxCmplt- RxOF+ MalfTLP+ ECRC- UnsupReq- ACSViol-
CESta: RxErr- BadTLP- BadDLLP- Rollover- Timeout- NonFatalErr-
CEMsk: RxErr- BadTLP- BadDLLP- Rollover- Timeout- NonFatalErr+
AERCap: First Error Pointer: 00, GenCap- CGenEn- ChkCap- ChkEn-
Capabilities: [140 v1] Access Control Services
ACSCap: SrcValid+ TransBlk+ ReqRedir+ CmpltRedir+
UpstreamFwd- EgressCtrl- DirectTrans-
ACSCtl: SrcValid- TransBlk- ReqRedir- CmpltRedir-
UpstreamFwd- EgressCtrl- DirectTrans-
Capabilities: [220 v1] #19
Kernel driver in use: pcieport
Kernel modules: shpchp

*** Plug-in the USB key

u@u-XPS-13-9xxx:~$ lspci -t
-[0000:00]-+-00.0
+-02.0
+-04.0
+-14.0
+-14.2
+-15.0
+-15.1
+-16.0
+-17.0
+-1c.0-[01-39]----00.0-[02-39]--+-00.0-[03]--
| +-01.0-[04-38]--
| \-02.0-[39]----00.0
+-1c.4-[3a]----00.0
+-1c.5-[3b]----00.0
+-1f.0
+-1f.2
+-1f.3
\-1f.4

u@u-XPS-13-9xxx:~$ lspci
00:00.0 Host bridge: Intel Corporation Device 5904 (rev 02)
00:02.0 VGA compatible controller: Intel Corporation Device 5916 (rev 02)
00:04.0 Signal processing controller: Intel Corporation Skylake
Processor Thermal Subsystem (rev 02)
00:14.0 USB controller: Intel Corporation Sunrise Point-LP USB 3.0
xHCI Controller (rev 21)
00:14.2 Signal processing controller: Intel Corporation Sunrise
Point-LP Thermal subsystem (rev 21)
00:15.0 Signal processing controller: Intel Corporation Sunrise
Point-LP Serial IO I2C Controller (rev 21)
00:15.1 Signal processing controller: Intel Corporation Sunrise
Point-LP Serial IO I2C Controller (rev 21)
00:16.0 Communication controller: Intel Corporation Sunrise Point-LP
CSME HECI (rev 21)
00:17.0 SATA controller: Intel Corporation Sunrise Point-LP SATA
Controller [AHCI mode] (rev 21)
00:1c.0 PCI bridge: Intel Corporation Device 9d10 (rev f1)
00:1c.4 PCI bridge: Intel Corporation Sunrise Point-LP PCI Express
Root Port (rev f1)
00:1c.5 PCI bridge: Intel Corporation Sunrise Point-LP PCI Express
Root Port (rev f1)
00:1f.0 ISA bridge: Intel Corporation Device 9d58 (rev 21)
00:1f.2 Memory controller: Intel Corporation Sunrise Point-LP PMC (rev 21)
00:1f.3 Audio device: Intel Corporation Device 9d71 (rev 21)
00:1f.4 SMBus: Intel Corporation Sunrise Point-LP SMBus (rev 21)
01:00.0 PCI bridge: Intel Corporation Device 1576
02:00.0 PCI bridge: Intel Corporation Device 1576
02:01.0 PCI bridge: Intel Corporation Device 1576
02:02.0 PCI bridge: Intel Corporation Device 1576
39:00.0 USB controller: Intel Corporation Device 15b5
3a:00.0 Network controller: Qualcomm Atheros QCA6174 802.11ac Wireless
Network Adapter (rev 32)
3b:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd.
RTS525A PCI Express Card Reader (rev 01)

*** Remove the USB key

u@u-XPS-13-9xxx:~$ lspci -t
-[0000:00]-+-00.0
+-02.0
+-04.0
+-14.0
+-14.2
+-15.0
+-15.1
+-16.0
+-17.0
+-1c.0-[01-39]--
+-1c.4-[3a]----00.0
+-1c.5-[3b]----00.0
+-1f.0
+-1f.2
+-1f.3
\-1f.4

u@u-XPS-13-9xxx:~$ lspci
00:00.0 Host bridge: Intel Corporation Device 5904 (rev 02)
00:02.0 VGA compatible controller: Intel Corporation Device 5916 (rev 02)
00:04.0 Signal processing controller: Intel Corporation Skylake
Processor Thermal Subsystem (rev 02)
00:14.0 USB controller: Intel Corporation Sunrise Point-LP USB 3.0
xHCI Controller (rev 21)
00:14.2 Signal processing controller: Intel Corporation Sunrise
Point-LP Thermal subsystem (rev 21)
00:15.0 Signal processing controller: Intel Corporation Sunrise
Point-LP Serial IO I2C Controller (rev 21)
00:15.1 Signal processing controller: Intel Corporation Sunrise
Point-LP Serial IO I2C Controller (rev 21)
00:16.0 Communication controller: Intel Corporation Sunrise Point-LP
CSME HECI (rev 21)
00:17.0 SATA controller: Intel Corporation Sunrise Point-LP SATA
Controller [AHCI mode] (rev 21)
00:1c.0 PCI bridge: Intel Corporation Device 9d10 (rev f1)
00:1c.4 PCI bridge: Intel Corporation Sunrise Point-LP PCI Express
Root Port (rev f1)
00:1c.5 PCI bridge: Intel Corporation Sunrise Point-LP PCI Express
Root Port (rev f1)
00:1f.0 ISA bridge: Intel Corporation Device 9d58 (rev 21)
00:1f.2 Memory controller: Intel Corporation Sunrise Point-LP PMC (rev 21)
00:1f.3 Audio device: Intel Corporation Device 9d71 (rev 21)
00:1f.4 SMBus: Intel Corporation Sunrise Point-LP SMBus (rev 21)
3a:00.0 Network controller: Qualcomm Atheros QCA6174 802.11ac Wireless
Network Adapter (rev 32)
3b:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd.
RTS525A PCI Express Card Reader (rev 01)

u@u-XPS-13-9xxx:~$ sudo lspci -vvvv -s 00:1c.0
00:1c.0 PCI bridge: Intel Corporation Device 9d10 (rev f1) (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
Interrupt: pin A routed to IRQ 16
Bus: primary=00, secondary=01, subordinate=39, sec-latency=0
I/O behind bridge: 00002000-00002fff
Memory behind bridge: c4000000-da0fffff
Prefetchable memory behind bridge: 00000000a0000000-00000000c1ffffff
Secondary status: 66MHz- FastB2B- ParErr- DEVSEL=fast >TAbort-
<TAbort- <MAbort+ <SERR- <PERR-
BridgeCtl: Parity- SERR- NoISA- VGA- MAbort- >Reset- FastB2B-
PriDiscTmr- SecDiscTmr- DiscTmrStat- DiscTmrSERREn-
Capabilities: [40] Express (v2) Root Port (Slot+), MSI 00
DevCap: MaxPayload 128 bytes, PhantFunc 0
ExtTag- RBE+
DevCtl: Report errors: Correctable- Non-Fatal- Fatal-
Unsupported-
RlxdOrd- ExtTag- PhantFunc- AuxPwr- NoSnoop-
MaxPayload 128 bytes, MaxReadReq 128 bytes
DevSta: CorrErr+ UncorrErr- FatalErr- UnsuppReq-
AuxPwr+ TransPend-
LnkCap: Port #1, Speed 8GT/s, Width x2, ASPM L1, Exit
Latency L0s <1us, L1 <16us
ClockPM- Surprise- LLActRep+ BwNot+ ASPMOptComp+
LnkCtl: ASPM Disabled; RCB 64 bytes Disabled- CommClk+
ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
LnkSta: Speed 2.5GT/s, Width x2, TrErr- Train-
SlotClk+ DLActive- BWMgmt+ ABWMgmt-
SltCap: AttnBtn- PwrCtrl- MRL- AttnInd- PwrInd-
HotPlug+ Surprise+
Slot #4, PowerLimit 25.000W; Interlock- NoCompl+
SltCtl: Enable: AttnBtn- PwrFlt- MRL- PresDet+
CmdCplt- HPIrq- LinkChg-
Control: AttnInd Unknown, PwrInd Unknown,
Power- Interlock-
SltSta: Status: AttnBtn- PowerFlt- MRL- CmdCplt-
PresDet- Interlock-
Changed: MRL- PresDet- LinkState+
RootCtl: ErrCorrectable- ErrNon-Fatal- ErrFatal-
PMEIntEna- CRSVisible-
RootCap: CRSVisible-
RootSta: PME ReqID 0000, PMEStatus- PMEPending-
DevCap2: Completion Timeout: Range ABC, TimeoutDis+,
LTR+, OBFF Not Supported ARIFwd+
DevCtl2: Completion Timeout: 50us to 50ms,
TimeoutDis-, LTR-, OBFF Disabled ARIFwd-
LnkCtl2: Target Link Speed: 8GT/s, EnterCompliance- SpeedDis-
Transmit Margin: Normal Operating Range,
EnterModifiedCompliance- ComplianceSOS-
Compliance De-emphasis: -6dB
LnkSta2: Current De-emphasis Level: -3.5dB,
EqualizationComplete-, EqualizationPhase1-
EqualizationPhase2-, EqualizationPhase3-,
LinkEqualizationRequest-
Capabilities: [80] MSI: Enable- Count=1/1 Maskable- 64bit-
Address: 00000000 Data: 0000
Capabilities: [90] Subsystem: Dell Device 075b
Capabilities: [a0] Power Management version 3
Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA
PME(D0+,D1-,D2-,D3hot+,D3cold+)
Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
Capabilities: [100 v1] Advanced Error Reporting
UESta: DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt-
UnxCmplt- RxOF- MalfTLP- ECRC- UnsupReq- ACSViol-
UEMsk: DLP- SDES- TLP- FCP- CmpltTO+ CmpltAbrt-
UnxCmplt+ RxOF- MalfTLP- ECRC- UnsupReq- ACSViol-
UESvrt: DLP+ SDES- TLP- FCP- CmpltTO- CmpltAbrt-
UnxCmplt- RxOF+ MalfTLP+ ECRC- UnsupReq- ACSViol-
CESta: RxErr+ BadTLP- BadDLLP- Rollover- Timeout- NonFatalErr-
CEMsk: RxErr- BadTLP- BadDLLP- Rollover- Timeout- NonFatalErr+
AERCap: First Error Pointer: 00, GenCap- CGenEn- ChkCap- ChkEn-
Capabilities: [140 v1] Access Control Services
ACSCap: SrcValid+ TransBlk+ ReqRedir+ CmpltRedir+
UpstreamFwd- EgressCtrl- DirectTrans-
ACSCtl: SrcValid- TransBlk- ReqRedir- CmpltRedir-
UpstreamFwd- EgressCtrl- DirectTrans-
Capabilities: [220 v1] #19
Kernel driver in use: pcieport
Kernel modules: shpchp

--
Chia-Lin Kao(AceLan)
http://blog.acelan.idv.tw/
E-Mail: acelan.kaoATcanonical.com (s/AT/@/)

Lukas Wunner

unread,
Jul 5, 2016, 3:49:31 AM7/5/16
to AceLan Kao, Mathias Nyman, Rafael J. Wysocki, Bjorn Helgaas, Andrew Morton, Linux Memory Management List, LKML, Linux PCI, ACPI Devel Maling List, Kirill A. Shutemov, USB
On Tue, Jul 05, 2016 at 11:00:21AM +0800, AceLan Kao wrote:
> These are logs from my machine.
>
> *** Before plug-in the USB key
>
> u@u-XPS-13-9xxx:~$ sudo lspci -vvvv -s 00:1c.0
> 00:1c.0 PCI bridge: Intel Corporation Device 9d10 (rev f1) (prog-if 00
> [Normal decode])
[...]
> LnkSta: Speed 2.5GT/s, Width x0, TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-
> SltCap: AttnBtn- PwrCtrl- MRL- AttnInd- PwrInd- HotPlug+ Surprise+

The link is down (DLActive-), but the root port is a hotplug port,
so apparently with Alpine Ridge the controller is powered down if
nothing is plugged in and this results in the controller being
"unplugged" from the root port.

This looks less fishy than I originally thought, it's just very
different from the power management of pre Alpine Ridge controllers
on Macs (which is the only thing I'm really familiar with), where
the root port is not a hotplug port and the controller does not
disappear from the system when powered down. (It's config space
just becomes inaccessible.)

Best regards,

Lukas
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