From: Kevin Buettner <kevinb@xxxxxxxxxx> [ Upstream commit 5727043c73fdfe04597971b5f3f4850d879c1f4f ] The AMD Starship USB 3.0 host controller advertises Function Level Reset support, but it apparently doesn't work. Add a quirk to prevent use of FLR on this device. Without this quirk, when attempting to assign (pass through) an AMD Starship USB 3.0 host controller to a guest OS, the system becomes increasingly unresponsive over the course of several minutes, eventually requiring a hard reset. Shortly after attempting to start the guest, I see these messages: vfio-pci 0000:05:00.3: not ready 1023ms after FLR; waiting vfio-pci 0000:05:00.3: not ready 2047ms after FLR; waiting vfio-pci 0000:05:00.3: not ready 4095ms after FLR; waiting vfio-pci 0000:05:00.3: not ready 8191ms after FLR; waiting And then eventually: vfio-pci 0000:05:00.3: not ready 65535ms after FLR; giving up INFO: NMI handler (perf_event_nmi_handler) took too long to run: 0.000 msecs perf: interrupt took too long (642744 > 2500), lowering kernel.perf_event_max_sample_rate to 1000 INFO: NMI handler (perf_event_nmi_handler) took too long to run: 82.270 msecs INFO: NMI handler (perf_event_nmi_handler) took too long to run: 680.608 msecs INFO: NMI handler (perf_event_nmi_handler) took too long to run: 100.952 msecs ... watchdog: BUG: soft lockup - CPU#3 stuck for 22s! [qemu-system-x86:7487] Tested on a Micro-Star International Co., Ltd. MS-7C59/Creator TRX40 motherboard with an AMD Ryzen Threadripper 3970X. Link: https://lore.kernel.org/r/20200524003529.598434ff@xxxxxxxxx Signed-off-by: Kevin Buettner <kevinb@xxxxxxxxxx> Signed-off-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- drivers/pci/quirks.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c index 9d00ecb1f5b5..226a4c5b2b7a 100644 --- a/drivers/pci/quirks.c +++ b/drivers/pci/quirks.c @@ -5133,6 +5133,7 @@ DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL, 0x443, quirk_intel_qat_vf_cap); * FLR may cause the following to devices to hang: * * AMD Starship/Matisse HD Audio Controller 0x1487 + * AMD Starship USB 3.0 Host Controller 0x148c * AMD Matisse USB 3.0 Host Controller 0x149c * Intel 82579LM Gigabit Ethernet Controller 0x1502 * Intel 82579V Gigabit Ethernet Controller 0x1503 @@ -5143,6 +5144,7 @@ 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_AMD, 0x1487, quirk_no_flr); +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_AMD, 0x148c, 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); -- 2.25.1
