diff options
Diffstat (limited to 'drivers/pci/ats.c')
| -rw-r--r-- | drivers/pci/ats.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/drivers/pci/ats.c b/drivers/pci/ats.c index e11ebafaf77..a4a1b369853 100644 --- 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 |