diff options
| author | Tal Gilboa <talgi@mellanox.com> | 2018-03-30 08:56:47 -0500 |
|---|---|---|
| committer | Bjorn Helgaas <helgaas@kernel.org> | 2018-04-03 08:58:30 -0500 |
| commit | 9e506a7b51474241f0c900e53e85512780275c05 (patch) | |
| tree | 95063571274cdd55ff08841a6dcbbdc5c20bc045 /include/linux/pci.h | |
| parent | 6db79a88c67e4679d9c1e4a3f05c6385e21f6e9a (diff) | |
| download | lwn-9e506a7b51474241f0c900e53e85512780275c05.tar.gz lwn-9e506a7b51474241f0c900e53e85512780275c05.zip | |
PCI: Add pcie_print_link_status() to log link speed and whether it's limited
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>
Diffstat (limited to 'include/linux/pci.h')
| -rw-r--r-- | include/linux/pci.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/pci.h b/include/linux/pci.h index f2bf2b7a66c7..38f7957121ef 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -1086,6 +1086,7 @@ int pcie_get_minimum_link(struct pci_dev *dev, enum pci_bus_speed *speed, u32 pcie_bandwidth_available(struct pci_dev *dev, struct pci_dev **limiting_dev, enum pci_bus_speed *speed, enum pcie_link_width *width); +void pcie_print_link_status(struct pci_dev *dev); void pcie_flr(struct pci_dev *dev); int __pci_reset_function_locked(struct pci_dev *dev); int pci_reset_function(struct pci_dev *dev); |