From e5b1db0186bfb3bede41e412b27c9bcf2b336622 Mon Sep 17 00:00:00 2001 From: Bjorn Helgaas Date: Fri, 30 Mar 2018 14:41:49 -0500 Subject: 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 --- drivers/pci/pci.c | 43 ------------------------------------------- 1 file changed, 43 deletions(-) (limited to 'drivers/pci/pci.c') diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index e597655a5643..4bafa817c40a 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -5069,49 +5069,6 @@ 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 -- cgit v1.2.3