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2078e1e7f7
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>
15 lines
443 B
Makefile
15 lines
443 B
Makefile
# SPDX-License-Identifier: GPL-2.0
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#
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# Makefile for PCI Express features and port driver
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pcieportdrv-y := portdrv_core.o portdrv_pci.o err.o
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obj-$(CONFIG_PCIEPORTBUS) += pcieportdrv.o
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obj-$(CONFIG_PCIEASPM) += aspm.o
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obj-$(CONFIG_PCIEAER) += aer.o
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obj-$(CONFIG_PCIEAER_INJECT) += aer_inject.o
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obj-$(CONFIG_PCIE_PME) += pme.o
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obj-$(CONFIG_PCIE_DPC) += dpc.o
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obj-$(CONFIG_PCIE_PTM) += ptm.o
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obj-$(CONFIG_PCIE_BW) += bw_notification.o
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