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>

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index e597655..4bafa81 100644 (file)
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -5070,49 +5070,6 @@ int pcie_set_mps(struct pci_dev *dev, int mps)
 EXPORT_SYMBOL(pcie_set_mps);
 
 /**
- * pcie_get_minimum_link - determine minimum link settings of a PCI device
- * @dev: PCI device to query
- * @speed: storage for minimum speed
- * @width: storage for minimum width
- *
- * This function will walk up the PCI device chain and determine the minimum
- * link width and speed of the device.
- */
-int pcie_get_minimum_link(struct pci_dev *dev, enum pci_bus_speed *speed,
-                         enum pcie_link_width *width)
-{
-       int ret;
-
-       *speed = PCI_SPEED_UNKNOWN;
-       *width = PCIE_LNK_WIDTH_UNKNOWN;
-
-       while (dev) {
-               u16 lnksta;
-               enum pci_bus_speed next_speed;
-               enum pcie_link_width next_width;
-
-               ret = pcie_capability_read_word(dev, PCI_EXP_LNKSTA, &lnksta);
-               if (ret)
-                       return ret;
-
-               next_speed = pcie_link_speed[lnksta & PCI_EXP_LNKSTA_CLS];
-               next_width = (lnksta & PCI_EXP_LNKSTA_NLW) >>
-                       PCI_EXP_LNKSTA_NLW_SHIFT;
-
-               if (next_speed < *speed)
-                       *speed = next_speed;
-
-               if (next_width < *width)
-                       *width = next_width;
-
-               dev = dev->bus->self;
-       }
-
-       return 0;
-}
-EXPORT_SYMBOL(pcie_get_minimum_link);
-
-/**
  * pcie_bandwidth_available - determine minimum link settings of a PCIe
  *                           device and its bandwidth limitation
  * @dev: PCI device to query

diff --git a/include/linux/pci.h b/include/linux/pci.h
index 5eb97e1..f7aa6d9 100644 (file)
--- 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);