[PATCH] PCI: Mark broken INTx masking for Mellanox devices

[Gavin Shan <gwshan@linux.vnet.ibm.com>]

The VFIO driver is routing LSI interrupts by capturing, masking,
and then delivering. When passing though Mallanox adapters from
host to guest, interrupt storm was reported from host and guest.
That's because we can't mask the LSI interrupt with help of PCI
command register.

The patch marks broken INTx masking for Mellanox devices so that
the VFIO driver will always mask the interrupt from interrupt
controller side to avoid interrupt storm.

Suggested-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
---
 drivers/pci/quirks.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index d0f6926..8c2b96f 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -2977,6 +2977,10 @@ DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_CHELSIO, 0x0030,
 			 quirk_broken_intx_masking);
 DECLARE_PCI_FIXUP_HEADER(0x1814, 0x0601, /* Ralink RT2800 802.11n PCI */
 			 quirk_broken_intx_masking);
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_MELLANOX, 0x1003,
+			 quirk_broken_intx_masking);
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_MELLANOX, 0x6750,
+			 quirk_broken_intx_masking);
 /*
  * Realtek RTL8169 PCI Gigabit Ethernet Controller (rev 10)
  * Subsystem: Realtek RTL8169/8110 Family PCI Gigabit Ethernet NIC
-- 
1.8.3.2