[Xen-devel] Lose XHCI Device on HP Ivybridge While Resuming on Battery

[Tom Goetz <tom.goetz@xxxxxxxxxxxxxxxxxxx>]

After resuming more than once on battery these HP Ivybridge laptops, the XHCI 
devices stop working. Have anyone seen this before? I wanted to check before 
diving in deeper. Let me know if you have any ideas. Thanks!

Facts
        - Xen 4.0.3, Linux 3.2.7 PVOPs
        - Happens on HP Ivybridge. Doesn't happen on very similar HP 
Sandybridge Clash system.
        - Happens on battery, but not on AC.
        - Doesn't happen on first suspend/resume. First resume may be long. 
Don't have enough sample to be sure of this.
        - CPU power governor doesn't effect the issue. Happens irregardless of 
governor.
        - Seems to effect MSI devices only.
        - IRQ changes appear in good resume case. Not just bad.
 
I've diffed lspci output across a working resume on AC and across a bad resume 
on battery. There seem to be the differences unique to the bad case:

 00:14.0 USB controller: Intel Corporation Panther Point USB xHCI Host 
Controller (rev 04) (prog-if 30 [XHCI])
 Subsystem: Hewlett-Packard Company Device 179b
-Flags: bus master, medium devsel, latency 0, IRQ 326
+Flags: medium devsel, IRQ 327                             <-------------- lose 
bus master, latency 0
 Memory at 94720000 (64-bit, non-prefetchable) [size=64K]
 Capabilities: [70] Power Management version 2
 Capabilities: [80] MSI: Enable+ Count=1/8 Maskable- 64bit+
 Kernel driver in use: xhci_hcd
 Kernel modules: xhci-hcd

--- 

 00:19.0 Ethernet controller: Intel Corporation 82579LM Gigabit Network 
Connection (rev 04)
 Subsystem: Hewlett-Packard Company Device 179b
-Flags: bus master, fast devsel, latency 0, IRQ 327
-Memory at 94700000 (32-bit, non-prefetchable) [size=128K]
-Memory at 9473a000 (32-bit, non-prefetchable) [size=4K]
-I/O ports at 4060 [size=32]
+Flags: fast devsel, IRQ 20                           <-------------- lose bus 
master, latency 0
+Memory at 94700000 (32-bit, non-prefetchable) [disabled] [size=128K]   <------ 
becomes disabled
+Memory at 9473a000 (32-bit, non-prefetchable) [disabled] [size=4K]     <------ 
becomes disabled
+I/O ports at 4060 [disabled] [size=32]                                 <------ 
becomes disabled
 Capabilities: [c8] Power Management version 2
-Capabilities: [d0] MSI: Enable+ Count=1/1 Maskable- 64bit+
+Capabilities: [d0] MSI: Enable- Count=1/1 Maskable- 64bit+    <---- toggle 
enable polarity
 Capabilities: [e0] PCI Advanced Features
 Kernel driver in use: e1000e
 Kernel modules: e1000e

---

 00:1a.0 USB controller: Intel Corporation Panther Point USB Enhanced Host 
Controller #2 (rev 04) (prog-if 20 [EHCI])
 Subsystem: Hewlett-Packard Company Device 179b
-Flags: bus master, medium devsel, latency 0, IRQ 16
+Flags: medium devsel, IRQ 16                           <-------------- lose 
bus master, latency 0
 Memory at 94739000 (32-bit, non-prefetchable) [size=1K]
 Capabilities: [50] Power Management version 2
 Capabilities: [58] Debug port: BAR=1 offset=00a0
 Capabilities: [98] PCI Advanced Features
 Kernel driver in use: ehci_hcd
 Kernel modules: ehci-hcd

syslog looks like this for both good and bad resumes:

Mar  5 15:48:51 newt kernel: [  289.730303] xhci_hcd 0000:00:14.0: can't derive 
routing for PCI INT A
Mar  5 15:48:51 newt kernel: [  289.730311] xhci_hcd 0000:00:14.0: PCI INT A: 
no GSI - using ISA IRQ 10
Mar  5 15:48:51 newt kernel: [  289.730319] xen: registering gsi 10 triggering 
0 polarity 1
Mar  5 15:48:51 newt kernel: [  289.730327] xen_map_pirq_gsi: returning irq 10 
for gsi 10
Mar  5 15:48:51 newt kernel: [  289.730332] xen: --> pirq=10 -> irq=10 (gsi=10)
Mar  5 15:48:51 newt kernel: [  289.730337] Already setup the GSI :10
Mar  5 15:48:51 newt kernel: [  289.730445] xhci_hcd 0000:00:14.0: setting 
latency timer to 64
Mar  5 15:48:51 newt kernel: [  289.730455] xhci_hcd 0000:00:14.0: xHCI Host 
Controller
Mar  5 15:48:51 newt kernel: [  289.730687] xhci_hcd 0000:00:14.0: new USB bus 
registered, assigned bus number 3
Mar  5 15:48:51 newt kernel: [  289.730826] xhci_hcd 0000:00:14.0: cache line 
size of 64 is not supported
Mar  5 15:48:51 newt kernel: [  289.730858] xhci_hcd 0000:00:14.0: irq 10, io 
mem 0x94720000
Mar  5 15:48:51 newt kernel: [  289.731470] xHCI xhci_add_endpoint called for 
root hub
Mar  5 15:48:51 newt kernel: [  289.731477] xHCI xhci_check_bandwidth called 
for root hub
Mar  5 15:48:51 newt kernel: [  289.731551] hub 3-0:1.0: USB hub found
Mar  5 15:48:51 newt kernel: [  289.731568] hub 3-0:1.0: 4 ports detected
Mar  5 15:48:51 newt kernel: [  289.843501] xhci_hcd 0000:00:14.0: xHCI Host 
Controller
Mar  5 15:48:51 newt kernel: [  289.843722] xhci_hcd 0000:00:14.0: new USB bus 
registered, assigned bus number 4
Mar  5 15:48:51 newt kernel: [  289.844015] xHCI xhci_add_endpoint called for 
root hub
Mar  5 15:48:51 newt kernel: [  289.844021] xHCI xhci_check_bandwidth called 
for root hub
Mar  5 15:48:51 newt kernel: [  289.844084] hub 4-0:1.0: USB hub found
Mar  5 15:48:51 newt kernel: [  289.844104] hub 4-0:1.0: 4 ports detected
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