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
..
controller	pci-v5.1-changes	2019-03-09 14:57:08 -08:00
endpoint	PCI: pci-epf-test: Use pci_epc_get_features() to get EPC features	2019-02-15 10:01:16 +00:00
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	cross-tree: phase out dma_zalloc_coherent()	2019-01-08 07:58:37 -05:00
access.c	PCI: Uninline PCI bus accessors for better ftracing	2018-10-04 16:37:37 -05:00
ats.c	PCI/ATS: Add pci_ats_page_aligned() interface	2019-02-26 11:08:07 +01:00
bus.c	PCI: Fix is_added/is_busmaster race condition	2018-07-31 11:27:54 -05:00
ecam.c
host-bridge.c
iov.c	PCI/IOV: Add flag so platforms can skip VF scanning	2019-01-01 19:04:37 -06:00
irq.c	PCI: Use IRQF_ONESHOT if pci_request_irq() called with no handler	2018-07-31 10:43:43 -05:00
Kconfig	PCI: Fix PCI kconfig menu organization	2019-01-14 17:01:20 -06:00
Makefile	PCI/ACPI: Allow ACPI to be built without CONFIG_PCI set	2018-12-20 10:19:49 +01:00
mmap.c
msi.c	PCI/MSI: Remove obsolete sanity checks for multiple interrupt sets	2019-02-18 11:21:29 +01:00
of.c	PCI: Use of_node_name_eq() for node name comparisons	2019-01-22 14:13:02 -06:00
p2pdma.c	pci-v4.21-changes	2019-01-05 17:57:34 -08:00
pci-acpi.c	PCI / ACPI: Identify untrusted PCI devices	2018-12-05 12:01:55 +03:00
pci-bridge-emul.c	PCI: pci-bridge-emul: Extend pci_bridge_emul_init() with flags	2019-02-22 10:51:14 +00:00
pci-bridge-emul.h	PCI: pci-bridge-emul: Extend pci_bridge_emul_init() with flags	2019-02-22 10:51:14 +00:00
pci-driver.c	PCI: Clean up usage of __u32 type	2019-02-08 13:40:36 -06:00
pci-label.c
pci-mid.c	x86/cpu: Sanitize FAM6_ATOM naming	2018-10-02 10:14:32 +02:00
pci-pf-stub.c
pci-stub.c
pci-sysfs.c	PCI: pci-sysfs.c: convert to use BUS_ATTR_WO	2019-01-22 14:25:26 +01:00
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	Remove 'type' argument from access_ok() function	2019-01-03 18:57:57 -08:00
quirks.c	PCI: Add function 1 DMA alias quirk for Marvell 9170 SATA controller	2019-04-05 16:11:16 -05:00
remove.c	PCI/ASPM: Fix link_state teardown on device removal	2018-09-17 16:32:23 -05:00
rom.c	PCI: Make pci_get_rom_size() static	2018-06-29 21:17:26 -05:00
search.c
setup-bus.c	PCI: Rely on config space header type, not class code	2019-01-30 10:57:08 -06:00
setup-irq.c
setup-res.c
slot.c	PCI/ERR: Use slot reset if available	2018-09-21 12:18:10 -05:00
syscall.c
vc.c
vpd.c	PCI/VPD: Check for VPD access completion before checking for timeout	2018-08-14 16:04:46 -05:00
xen-pcifront.c