On Friday, June 12, 2015 01:01:27 PM Bjorn Helgaas wrote: > FYI. There's more information and analysis, but no resolution yet, in > the bugzilla. pciehp_resume() seems to be problematic (and "pcie_ports=compat" probably simply disables PCIe hotplug on that system). > ---------- Forwarded message ---------- > From: <bugzilla-daemon@xxxxxxxxxxxxxxxxxxx> > Date: Wed, Jun 10, 2015 at 11:25 AM > Subject: [Bug 99751] New: Enormous resume delay, unless pcie_ports=compat > To: bhelgaas@xxxxxxxxxx > > > https://bugzilla.kernel.org/show_bug.cgi?id=99751 > > Bug ID: 99751 > Summary: Enormous resume delay, unless pcie_ports=compat > Product: Drivers > Version: 2.5 > Kernel Version: 3.15 through 4.1rc5 > Hardware: All > OS: Linux > Tree: Mainline > Status: NEW > Severity: normal > Priority: P1 > Component: PCI > Assignee: drivers_pci@xxxxxxxxxxxxxxxxxxxx > Reporter: lenb@xxxxxxxxxx > Regression: No > > Created attachment 179451 > --> https://bugzilla.kernel.org/attachment.cgi?id=179451&action=edit > lspci -vvv output > > On a Dell XPS11 laptop, pcieport 0000:00:1c.0 takes > several seconds to resume from suspend. > > Booting with "pcie_ports=compat", or > building with CONFIG_HOTPLUG_PCI_PCIE=n > makes this delay go away. > > I've tested Linux-3.14.44 and do not see this delay. > I've tested Linux-3.15.0 and others up through 4.1-rc5 > and I do see this delay. So I'll mark this as a regression. > > while I use analyze_suspend.py to trace resume, > initcall_debug is sufficient to show this delay in dmesg, > and I notice some additional PCI warnings there: > > [ 55.897986] pciehp 0000:00:1c.0:pcie04: Link Training Error occurs > [ 55.897988] pciehp 0000:00:1c.0:pcie04: Failed to check link status > [ 55.897992] call 0000:00:1c.0+ returned 0 after 2197660 usecs > > (yes, that is 2.19 SECONDS -- where anything> 50ms for resume is considered > slow) > > Unclear (to me) what pcie04 is... > > $ lspci > 00:00.0 Host bridge: Intel Corporation Haswell-ULT DRAM Controller (rev 0b) > 00:02.0 VGA compatible controller: Intel Corporation Device 0a1e (rev 0b) > 00:03.0 Audio device: Intel Corporation Haswell-ULT HD Audio Controller (rev > 0b) > 00:04.0 Signal processing controller: Intel Corporation Device 0a03 (rev 0b) > 00:14.0 USB controller: Intel Corporation 8 Series USB xHCI HC (rev 04) > 00:16.0 Communication controller: Intel Corporation 8 Series HECI #0 (rev 04) > 00:1b.0 Audio device: Intel Corporation 8 Series HD Audio Controller (rev 04) > 00:1c.0 PCI bridge: Intel Corporation 8 Series PCI Express Root Port 1 (rev e4) > 00:1c.1 PCI bridge: Intel Corporation 8 Series PCI Express Root Port 2 (rev e4) > 00:1c.3 PCI bridge: Intel Corporation 8 Series PCI Express Root Port 4 (rev e4) > 00:1d.0 USB controller: Intel Corporation 8 Series USB EHCI #1 (rev 04) > 00:1f.0 ISA bridge: Intel Corporation 8 Series LPC Controller (rev 04) > 00:1f.2 SATA controller: Intel Corporation 8 Series SATA Controller 1 [AHCI > mode] (rev 04) > 00:1f.3 SMBus: Intel Corporation 8 Series SMBus Controller (rev 04) > 00:1f.6 Signal processing controller: Intel Corporation 8 Series Thermal (rev > 04) > 05:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS5249 PCI > Express Card Reader (rev 01) > 07:00.0 Network controller: Intel Corporation Wireless 7260 (rev 6b) > > This 04 item appears under 1c.0 when I ask lspci about topology: > $ lspci -tv > -[0000:00]-+-00.0 Intel Corporation Haswell-ULT DRAM Controller > +-02.0 Intel Corporation Device 0a1e > +-03.0 Intel Corporation Haswell-ULT HD Audio Controller > +-04.0 Intel Corporation Device 0a03 > +-14.0 Intel Corporation 8 Series USB xHCI HC > +-16.0 Intel Corporation 8 Series HECI #0 > +-1b.0 Intel Corporation 8 Series HD Audio Controller > +-1c.0-[04]-- > +-1c.1-[05]----00.0 Realtek Semiconductor Co., Ltd. RTS5249 PCI > Express Card Reader > +-1c.3-[07]----00.0 Intel Corporation Wireless 7260 > +-1d.0 Intel Corporation 8 Series USB EHCI #1 > +-1f.0 Intel Corporation 8 Series LPC Controller > +-1f.2 Intel Corporation 8 Series SATA Controller 1 [AHCI mode] > +-1f.3 Intel Corporation 8 Series SMBus Controller > \-1f.6 Intel Corporation 8 Series Thermal > > -- > You are receiving this mail because: > You are watching the assignee of the bug. > -- > To unsubscribe from this list: send the line "unsubscribe linux-pci" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- I speak only for myself. Rafael J. Wysocki, Intel Open Source Technology Center. -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
