Keith Busch 2078e1e7f7 PCI/LINK: Add Kconfig option (default off) ... e8303bb7a7 ("PCI/LINK: Report degraded links via link bandwidth notification") added dmesg logging whenever a link changes speed or width to a state that is considered degraded. Unfortunately, it cannot differentiate signal integrity-related link changes from those intentionally initiated by an endpoint driver, including drivers that may live in userspace or VMs when making use of vfio-pci. Some GPU drivers actively manage the link state to save power, which generates a stream of messages like this: vfio-pci 0000:07:00.0: 32.000 Gb/s available PCIe bandwidth, limited by 2.5 GT/s x16 link at 0000:00:02.0 (capable of 64.000 Gb/s with 5 GT/s x16 link) Since we can't distinguish the intentional changes from the signal integrity issues, leave the reporting turned off by default. Add a Kconfig option to turn it on if desired. Fixes: e8303bb7a7 ("PCI/LINK: Report degraded links via link bandwidth notification") Link: https://lore.kernel.org/linux-pci/20190501142942.26972-1-keith.busch@intel.com Signed-off-by: Keith Busch <keith.busch@intel.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>		2019-05-02 08:34:32 -05:00
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controller	pci-v5.1-changes	2019-03-09 14:57:08 -08:00
endpoint
hotplug	PCI: pciehp: Ignore Link State Changes after powering off a slot	2019-04-10 16:06:43 -05:00
pcie	PCI/LINK: Add Kconfig option (default off)	2019-05-02 08:34:32 -05:00
switch
access.c
ats.c
bus.c
ecam.c
host-bridge.c
iov.c
irq.c
Kconfig
Makefile
mmap.c
msi.c
of.c
p2pdma.c
pci-acpi.c
pci-bridge-emul.c
pci-bridge-emul.h
pci-driver.c
pci-label.c
pci-mid.c
pci-pf-stub.c
pci-stub.c
pci-sysfs.c
pci.c	PCI: Fix issue with "pci=disable_acs_redir" parameter being ignored	2019-04-12 15:32:08 -05:00
pci.h	PCI/LINK: Deduplicate bandwidth reports for multi-function devices	2019-03-25 17:59:07 -05:00
probe.c	PCI/LINK: Deduplicate bandwidth reports for multi-function devices	2019-03-25 17:59:07 -05:00
proc.c
quirks.c	PCI: Add function 1 DMA alias quirk for Marvell 9170 SATA controller	2019-04-05 16:11:16 -05:00
remove.c
rom.c
search.c
setup-bus.c
setup-irq.c
setup-res.c
slot.c
syscall.c
vc.c
vpd.c
xen-pcifront.c