[PATCH 1/1][SRU][Focal] PCI: Avoid FLR for AMD Matisse HD Audio & USB 3.0

[Marcos Scriven]

BugLink: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1865988

These devices advertise a Function Level Reset (FLR) capability, but hang
when an FLR is triggered.

To reproduce the problem, attach the device to a VM, then detach and try to
attach again.

Rename the existing quirk_intel_no_flr(), which was not Intel-specific, to
quirk_no_flr(), and apply it to prevent the use of FLR on these AMD
devices.

Signed-off-by: Marcos Scriven <marcos at scriven.org>
Signed-off-by: Bjorn Helgaas <bhelgaas at google.com>
(cherry picked from commit efaa35873d66bf4a4903f757333692766e34e448 helgaas/pci pci/virtualization)
Signed-off-by: Marcos Scriven <marcos at scriven.org>
---
 drivers/pci/quirks.c | 18 ++++++++++++++----
 1 file changed, 14 insertions(+), 4 deletions(-)

diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index 8991b59c5c5b..886c35d8dbd1 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -5098,13 +5098,23 @@ static void quirk_intel_qat_vf_cap(struct pci_dev *pdev)
 }
 DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL, 0x443, quirk_intel_qat_vf_cap);
 
-/* FLR may cause some 82579 devices to hang */
-static void quirk_intel_no_flr(struct pci_dev *dev)
+/*
+ * FLR may cause the following to devices to hang:
+ *
+ * AMD Starship/Matisse HD Audio Controller 0x1487
+ * AMD Matisse USB 3.0 Host Controller 0x149c
+ * Intel 82579LM Gigabit Ethernet Controller 0x1502
+ * Intel 82579V Gigabit Ethernet Controller 0x1503
+ *
+ */
+static void quirk_no_flr(struct pci_dev *dev)
 {
 	dev->dev_flags |= PCI_DEV_FLAGS_NO_FLR_RESET;
 }
-DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL, 0x1502, quirk_intel_no_flr);
-DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL, 0x1503, quirk_intel_no_flr);
+DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_AMD, 0x1487, quirk_no_flr);
+DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_AMD, 0x149c, quirk_no_flr);
+DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL, 0x1502, quirk_no_flr);
+DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL, 0x1503, quirk_no_flr);
 
 static void quirk_intel_th_rtit_bar(struct pci_dev *dev)
 {
-- 
2.25.1