From: Kuppuswamy Sathyanarayanan <[email protected]>
Don't initialize ATS for VF/PF devices if the ATS Capability implementaion is not aligned with PCIe spec r4.0 sec 9.3.7.8. Cc: Ashok Raj <[email protected]> Cc: Keith Busch <[email protected]> Suggested-by: Ashok Raj <[email protected]> Reviewed-by: Keith Busch <[email protected]> Signed-off-by: Kuppuswamy Sathyanarayanan <[email protected]> --- drivers/pci/ats.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/pci/ats.c b/drivers/pci/ats.c index 28bbf7dad425..11299d93a59a 100644 --- a/drivers/pci/ats.c +++ b/drivers/pci/ats.c @@ -23,6 +23,12 @@ void pci_ats_init(struct pci_dev *dev) if (pci_ats_disabled()) return; + /* If ATS Cap is invalid then return */ + if (dev->is_virtfn || dev->is_physfn) { + if (dev->invalid_cap & PCI_IOV_INVALID_ATS) + return; + } + pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ATS); if (!pos) return; -- 2.20.1
