PCI: Add function to obtain minimum link width and speed

A PCI Express device can potentially report a link width and speed which it will
not properly fulfill due to being plugged into a slower link higher in the
chain. This function walks up the PCI bus chain and calculates the minimum link
width and speed of this entire chain. This can be useful to enable a device to
determine if it has enough bandwidth for optimum functionality.

Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Tested-by: Phil Schmitt <phillip.j.schmitt@intel.com>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

1 files changed, 43 insertions, 0 deletions

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index e37fea6e178d..c71e78c46705 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -3579,6 +3579,49 @@ int pcie_set_mps(struct pci_dev *dev, int 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);
+
+/**
  * pci_select_bars - Make BAR mask from the type of resource
  * @dev: the PCI device for which BAR mask is made
  * @flags: resource type mask to be selected