PCI: Add pcie_print_link_status() to log link speed and whether it's limited

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Add pcie_print_link_status().  This logs the current settings of the link
(speed, width, and total available bandwidth).

If the device is capable of more bandwidth but is limited by a slower
upstream link, we include information about the link that limits the
device's performance.

The user may be able to move the device to a different slot for better
performance.

This provides a unified method for all PCI devices to report status and
issues, instead of each device reporting in a different way, using
different code.

Signed-off-by: Tal Gilboa <talgi@mellanox.com>
[bhelgaas: changelog, reword log messages, print device capabilities when
not limited, print bandwidth in Gb/s]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

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Tal Gilboa 2018-03-30 08:56:47 -05:00 • committed by Bjorn Helgaas

parent 6db79a88c6

commit 9e506a7b51

2 changed files with 33 additions and 0 deletions

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32

drivers/pci/pci.c

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1

include/linux/pci.h

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