PCI: Export pcie_flr()

Currently we opencode the FLR sequence in lots of place; export a core
helper instead.  We split out the probing for FLR support as all the
non-core callers already know their hardware.

Note that in the new pci_has_flr() function the quirk check has been moved
before the capability check as there is no point in reading the capability
in this case.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

1 files changed, 28 insertions, 11 deletions

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index bef14777bb30..957a11a6a840 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -3773,27 +3773,41 @@ static void pci_flr_wait(struct pci_dev *dev)
 			 (i - 1) * 100);
 }
 
-static int pcie_flr(struct pci_dev *dev, int probe)
+/**
+ * pcie_has_flr - check if a device supports function level resets
+ * @dev:	device to check
+ *
+ * Returns true if the device advertises support for PCIe function level
+ * resets.
+ */
+static bool pcie_has_flr(struct pci_dev *dev)
 {
 	u32 cap;
 
-	pcie_capability_read_dword(dev, PCI_EXP_DEVCAP, &cap);
-	if (!(cap & PCI_EXP_DEVCAP_FLR))
-		return -ENOTTY;
-
 	if (dev->dev_flags & PCI_DEV_FLAGS_NO_FLR_RESET)
-		return -ENOTTY;
+		return false;
 
-	if (probe)
-		return 0;
+	pcie_capability_read_dword(dev, PCI_EXP_DEVCAP, &cap);
+	return cap & PCI_EXP_DEVCAP_FLR;
+}
 
+/**
+ * pcie_flr - initiate a PCIe function level reset
+ * @dev:	device to reset
+ *
+ * Initiate a function level reset on @dev.  The caller should ensure the
+ * device supports FLR before calling this function, e.g. by using the
+ * pcie_has_flr() helper.
+ */
+void pcie_flr(struct pci_dev *dev)
+{
 	if (!pci_wait_for_pending_transaction(dev))
 		dev_err(&dev->dev, "timed out waiting for pending transaction; performing function level reset anyway\n");
 
 	pcie_capability_set_word(dev, PCI_EXP_DEVCTL, PCI_EXP_DEVCTL_BCR_FLR);
 	pci_flr_wait(dev);
-	return 0;
 }
+EXPORT_SYMBOL_GPL(pcie_flr);
 
 static int pci_af_flr(struct pci_dev *dev, int probe)
 {
@@ -3977,9 +3991,12 @@ static int __pci_dev_reset(struct pci_dev *dev, int probe)
 	if (rc != -ENOTTY)
 		goto done;
 
-	rc = pcie_flr(dev, probe);
-	if (rc != -ENOTTY)
+	if (pcie_has_flr(dev)) {
+		if (!probe)
+			pcie_flr(dev);
+		rc = 0;
 		goto done;
+	}
 
 	rc = pci_af_flr(dev, probe);
 	if (rc != -ENOTTY)