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

[Tom Goetz <tom.goetz@xxxxxxxxxxxxxxxxxxx>]

> I have more information on this. Here's the sequence of events:
> 
> 1. XHCI driver removed with SUSPEND_MODULES
> 2. suspend
> 3. resume
> 4. XHCI driver loaded by SUSPEND_MODULES
> 5. Device is enabled by driver.
> 6. Device disabled by runtime PM.
> 7. Plugging in a USB device does not result in the device being enabled.
> 
> This works on the same machine in Ubuntu 12.04 Beta 1 (Linux 3.2.0) native 
> which is very similar to our Ubuntu 12.04 based (Linux 3.2.5 & 3.2.9) build. 
> So 
> either this was broken between 3.2.0 and 3.2.5 or this is Xen related. I've 
> included some tracing of resume and runtime pm suspend of the device. A USB 
> flash stick was plugged in at the end of the log where nothing happens:
> 

Another update. This is an issue both on a Ivybridge laptop and a Intel SDP 
desktop. It does not require running on battery. Setting the device's runtime 
power mode to "auto" and letting the device suspend after a S3 resume results 
in a device that will not wake up on device insertion. I've attached a trace 
from the good case of the path that doesn't happen in the bad case. I've 
instrumented down to xhci_msi_irq and it is not happening when a USB device is 
inserted in the bad case.

[  612.701424] usb_hcd_resume_root_hub[2079] xHCI Host Controller
[  612.701431] ------------[ cut here ]------------
[  612.701444] WARNING: at 
/home/likewise-open/ORC/tgoetz/sandbox/orc-precise/linux-3.2/drivers/usb/core/hcd.c:2080
 usb_hcd_resume_root_hub+0x4f/0xa0()
[  612.701454] Modules linked in: e1000e iwlwifi(O) mac80211(O) cfg80211(O) 
xhci_hcd tpm_tis tpm_infineon tpm tpm_bios ehci_hcd xt_mac xt_tcpudp 
ipt_MASQUERADE xt_state xt_multiport iptable_filter iptable_nat nf_nat 
nf_conntrack_ipv4 nf_conntrack nf_defrag_ipv4 ip_tables x_tables iscsi_scst(O) 
scst_vdisk(O) crc32c libcrc32c scst_cdrom(O) scst(O) bridge stp llc microcode 
iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi snd_hda_codec_hdmi 
snd_hda_codec_idt arc4 snd_hda_intel snd_hda_codec snd_hwdep snd_pcm hp_wmi 
sparse_keymap snd_timer ppdev parport_pc psmouse snd soundcore serio_raw 
snd_page_alloc parport zram(C) ahci libahci sdhci_pci sdhci i915 drm_kms_helper 
drm i2c_algo_bit video intel_agp intel_gtt [last unloaded: tpm_bios]
[  612.701557] Pid: 0, comm: swapper/0 Tainted: G        WC O 3.2.9-orc #28
[  612.701559] Call Trace:
[  612.701560]  <IRQ>  [<ffffffff810633df>] warn_slowpath_common+0x7f/0xc0
[  612.701566]  [<ffffffff8106343a>] warn_slowpath_null+0x1a/0x20
[  612.701569]  [<ffffffff8141933f>]usb_hcd_resume_root_hub+0x4f/0xa0
[  612.701573]  [<ffffffffa049a52a>] xhci_irq+0xb0a/0x11c0 [xhci_hcd]
[  612.701576]  [<ffffffff8104b853>] ? __wake_up+0x53/0x70
[  612.701579]  [<ffffffff8100a58d>] ? xen_force_evtchn_callback+0xd/0x10
[  612.701582]  [<ffffffff8100ad42>] ? check_events+0x12/0x20
[  612.701585]  [<ffffffffa049ac11>]xhci_msi_irq+0x31/0x40 [xhci_hcd]
[  612.701589]  [<ffffffff810d0b15>] handle_irq_event_percpu+0x55/0x220
[  612.701592]  [<ffffffff812b651b>] ? radix_tree_lookup+0xb/0x10
[  612.701595]  [<ffffffff810d0d2e>] handle_irq_event+0x4e/0x80
[  612.701598]  [<ffffffff810d3d24>] handle_edge_irq+0x84/0x130
[  612.701602]  [<ffffffff813415d9>] __xen_evtchn_do_upcall+0x199/0x250
[  612.701605]  [<ffffffff8134362f>] xen_evtchn_do_upcall+0x2f/0x50
[  612.701608]  [<ffffffff81581efe>] xen_do_hypervisor_callback+0x1e/0x30
[  612.701609]  <EOI>  [<ffffffff810013aa>] ? hypercall_page+0x3aa/0x1000
[  612.701615]  [<ffffffff810013aa>] ? hypercall_page+0x3aa/0x1000
[  612.701618]  [<ffffffff8100a4c0>] ? xen_safe_halt+0x10/0x20
[  612.701621]  [<ffffffff8101c653>] ? default_idle+0x53/0x1d0
[  612.701624]  [<ffffffff81013236>] ? cpu_idle+0xd6/0x120
[  612.701628]  [<ffffffff81552f6e>] ? rest_init+0x72/0x74
[  612.701633]  [<ffffffff81accbff>] ? start_kernel+0x3b5/0x3c2
[  612.701636]  [<ffffffff81acc34b>] ? x86_64_start_reservations+0x136/0x13a
[  612.701639]  [<ffffffff81acfecc>] ? xen_start_kernel+0x630/0x637
[  612.701641] ---[ end trace 81e0ca5cff766fb7 ]---
[  612.701659] hcd_resume_work[2060] xHCI Host Controller
[  612.701662] __pm_runtime_resume[880] usb3 RPM_GET_PUT 1
[  612.701663] rpm_resume[512] usb3 before
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