Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...

[~andy/linux] / drivers / pci / ats.c

diff --git a/drivers/pci/ats.c b/drivers/pci/ats.c
index 9dd90b30f91a23703c420f5b60cf1fc2d31f55cd..95655d7c0d0b1abdd7e2d4c584af7f0f4217d184 100644 (file)
--- a/drivers/pci/ats.c
+++ b/drivers/pci/ats.c
@@ -128,6 +128,23 @@ void pci_disable_ats(struct pci_dev *dev)
 }
 EXPORT_SYMBOL_GPL(pci_disable_ats);
 
+void pci_restore_ats_state(struct pci_dev *dev)
+{
+       u16 ctrl;
+
+       if (!pci_ats_enabled(dev))
+               return;
+       if (!pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ATS))
+               BUG();
+
+       ctrl = PCI_ATS_CTRL_ENABLE;
+       if (!dev->is_virtfn)
+               ctrl |= PCI_ATS_CTRL_STU(dev->ats->stu - PCI_ATS_MIN_STU);
+
+       pci_write_config_word(dev, dev->ats->pos + PCI_ATS_CTRL, ctrl);
+}
+EXPORT_SYMBOL_GPL(pci_restore_ats_state);
+
 /**
  * pci_ats_queue_depth - query the ATS Invalidate Queue Depth
  * @dev: the PCI device