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| author | Bjorn Helgaas <bhelgaas@google.com> | 2018-03-30 14:41:49 -0500 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2018-05-25 17:29:49 -0500 |
| commit | e5b1db0186bfb3bede41e412b27c9bcf2b336622 (patch) | |
| tree | a8108847dd2b5f06782536e6dd8fc2c9715d3a1b /include/linux | |
| parent | 4695ca9d17a2f47e0be3011ef25a4d77b973b547 (diff) | |
| download | talos-op-linux-e5b1db0186bfb3bede41e412b27c9bcf2b336622.tar.gz talos-op-linux-e5b1db0186bfb3bede41e412b27c9bcf2b336622.zip | |
PCI: Remove unused pcie_get_minimum_link()
In some cases pcie_get_minimum_link() returned misleading information
because it found the slowest link and the narrowest link without
considering the total bandwidth of the link.
For example, consider a path with these two links:
- 16.0 GT/s x1 link (16.0 * 10^9 * 128 / 130) * 1 / 8 = 1969 MB/s
- 2.5 GT/s x16 link ( 2.5 * 10^9 * 8 / 10) * 16 / 8 = 4000 MB/s
The available bandwidth of the path is limited by the 16 GT/s link to about
1969 MB/s, but pcie_get_minimum_link() returned 2.5 GT/s x1, which
corresponds to only 250 MB/s.
Callers should use pcie_print_link_status() instead, or
pcie_bandwidth_available() if they need more detailed information.
Remove pcie_get_minimum_link() since there are no callers left.
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/pci.h | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/include/linux/pci.h b/include/linux/pci.h index 5eb97e198325..f7aa6d9f8999 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -1080,8 +1080,6 @@ int pcie_get_readrq(struct pci_dev *dev); int pcie_set_readrq(struct pci_dev *dev, int rq); int pcie_get_mps(struct pci_dev *dev); int pcie_set_mps(struct pci_dev *dev, int mps); -int pcie_get_minimum_link(struct pci_dev *dev, enum pci_bus_speed *speed, - enum pcie_link_width *width); u32 pcie_bandwidth_available(struct pci_dev *dev, struct pci_dev **limiting_dev, enum pci_bus_speed *speed, enum pcie_link_width *width); |
