From 11e42532ada3174840196e8f23df29cb91c44b50 Mon Sep 17 00:00:00 2001 From: Gavin Shan Date: Fri, 5 Sep 2014 15:35:30 -0600 Subject: [PATCH] PCI: Assume all Mellanox devices have broken INTx masking The VFIO driver routes LSI interrupts by capturing, masking, and then delivering. When passing though Mellanox adapters from host to guest, interrupt storm are reported from host and guest. That's because the PCI command register INTx Disable bit doesn't work on Mellanox devices. # lspci | grep Mellanox 0001:05:00.0 Ethernet controller: Mellanox Technologies MT27500 Family [ConnectX-3] 0005:01:00.0 Ethernet controller: Mellanox Technologies MT26448 [ConnectX EN 10GigE, PCIe 2.0 5GT/s] (rev b0) Amir Vadai confirmed that all Mellanox devices have same problem. The patch marks broken INTx masking for all Mellanox adapters. Suggested-by: Benjamin Herrenschmidt Signed-off-by: Gavin Shan Signed-off-by: Bjorn Helgaas Acked-By: Amir Vadai --- drivers/pci/quirks.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c index 80c2d014283d..da062d8ae36f 100644 --- a/drivers/pci/quirks.c +++ b/drivers/pci/quirks.c @@ -2985,6 +2985,8 @@ DECLARE_PCI_FIXUP_HEADER(0x1814, 0x0601, /* Ralink RT2800 802.11n PCI */ */ DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_REALTEK, 0x8169, quirk_broken_intx_masking); +DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_MELLANOX, PCI_ANY_ID, + quirk_broken_intx_masking); #ifdef CONFIG_ACPI /*