From: Bjorn Helgaas <bhelgaas@google.com>
To: "linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>
Cc: Rajat Jain <rajatja@google.com>, Yinghai Lu <yinghai@kernel.org>,
"alex.williamson@redhat.com" <alex.williamson@redhat.com>,
Rafael Wysocki <rafael.j.wysocki@intel.com>,
Myron Stowe <mstowe@redhat.com>,
"Brown, Len" <len.brown@intel.com>
Subject: Fwd: [Bug 99751] New: Enormous resume delay, unless pcie_ports=compat
Date: Fri, 12 Jun 2015 13:01:27 -0500 [thread overview]
Message-ID: <CAErSpo4ui+a4PRC8sWCzcSM1iWG7SHD_=x0Z9cj90-tgNKUvmw@mail.gmail.com> (raw)
In-Reply-To: <bug-99751-41252@https.bugzilla.kernel.org/>
FYI. There's more information and analysis, but no resolution yet, in
the bugzilla.
---------- Forwarded message ----------
From: <bugzilla-daemon@bugzilla.kernel.org>
Date: Wed, Jun 10, 2015 at 11:25 AM
Subject: [Bug 99751] New: Enormous resume delay, unless pcie_ports=compat
To: bhelgaas@google.com
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@kernel-bugs.osdl.org
Reporter: lenb@kernel.org
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
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next parent reply other threads:[~2015-06-12 18:01 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <bug-99751-41252@https.bugzilla.kernel.org/>
2015-06-12 18:01 ` Bjorn Helgaas [this message]
2015-06-13 1:26 ` Fwd: [Bug 99751] New: Enormous resume delay, unless pcie_ports=compat Rafael J. Wysocki
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