netdev - [PATCH] PCI: Add no-D3 quirk for Mellanox ConnectX-[45]

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Date:   Thu,  6 Dec 2018 15:19:51 +1100
From:   David Gibson <david@...son.dropbear.id.au>
To:     davem@...emloft.net, saeedm@...lanox.com, ogerlitz@...lanox.com,
        tariqt@...lanox.com, bhelgaas@...gle.com, leon@...nel.org
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        netdev@...r.kernel.org, alex.williamson@...hat.com,
        linux-pci@...r.kernel.org, linux-rdma@...r.kernel.org,
        sbest@...hat.com, paulus@...ba.org, benh@...nel.crashing.org,
        David Gibson <david@...son.dropbear.id.au>
Subject: [PATCH] PCI: Add no-D3 quirk for Mellanox ConnectX-[45]

Mellanox ConnectX-5 IB cards (MT27800) seem to cause a call trace when
unbound from their regular driver and attached to vfio-pci in order to pass
them through to a guest.

This goes away if the disable_idle_d3 option is used, so it looks like a
problem with the hardware handling D3 state.  To fix that more permanently,
use a device quirk to disable D3 state for these devices.

We do this by renaming the existing quirk_no_ata_d3() more generally and
attaching it to the ConnectX-[45] devices (0x15b3:0x1013).

Signed-off-by: David Gibson <david@...son.dropbear.id.au>
---
 drivers/pci/quirks.c | 17 +++++++++++------
 1 file changed, 11 insertions(+), 6 deletions(-)

diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index 4700d24e5d55..add3f516ca12 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -1315,23 +1315,24 @@ static void quirk_ide_samemode(struct pci_dev *pdev)
 }
 DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801CA_10, quirk_ide_samemode);
 
-/* Some ATA devices break if put into D3 */
-static void quirk_no_ata_d3(struct pci_dev *pdev)
+/* Some devices (including a number of ATA cards) break if put into D3 */
+static void quirk_no_d3(struct pci_dev *pdev)
 {
 	pdev->dev_flags |= PCI_DEV_FLAGS_NO_D3;
 }
+
 /* Quirk the legacy ATA devices only. The AHCI ones are ok */
 DECLARE_PCI_FIXUP_CLASS_EARLY(PCI_VENDOR_ID_SERVERWORKS, PCI_ANY_ID,
-				PCI_CLASS_STORAGE_IDE, 8, quirk_no_ata_d3);
+				PCI_CLASS_STORAGE_IDE, 8, quirk_no_d3);
 DECLARE_PCI_FIXUP_CLASS_EARLY(PCI_VENDOR_ID_ATI, PCI_ANY_ID,
-				PCI_CLASS_STORAGE_IDE, 8, quirk_no_ata_d3);
+				PCI_CLASS_STORAGE_IDE, 8, quirk_no_d3);
 /* ALi loses some register settings that we cannot then restore */
 DECLARE_PCI_FIXUP_CLASS_EARLY(PCI_VENDOR_ID_AL, PCI_ANY_ID,
-				PCI_CLASS_STORAGE_IDE, 8, quirk_no_ata_d3);
+				PCI_CLASS_STORAGE_IDE, 8, quirk_no_d3);
 /* VIA comes back fine but we need to keep it alive or ACPI GTM failures
    occur when mode detecting */
 DECLARE_PCI_FIXUP_CLASS_EARLY(PCI_VENDOR_ID_VIA, PCI_ANY_ID,
-				PCI_CLASS_STORAGE_IDE, 8, quirk_no_ata_d3);
+				PCI_CLASS_STORAGE_IDE, 8, quirk_no_d3);
 
 /*
  * This was originally an Alpha-specific thing, but it really fits here.
@@ -3367,6 +3368,10 @@ static void mellanox_check_broken_intx_masking(struct pci_dev *pdev)
 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_MELLANOX, PCI_ANY_ID,
 			mellanox_check_broken_intx_masking);
 
+/* Mellanox MT27800 (ConnectX-5) IB card seems to break with D3
+ * In particular this shows up when the device is bound to the vfio-pci driver */
+DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_MELLANOX, PCI_DEVICE_ID_MELLANOX_CONNECTX4, quirk_no_d3)
+
 static void quirk_no_bus_reset(struct pci_dev *dev)
 {
 	dev->dev_flags |= PCI_DEV_FLAGS_NO_BUS_RESET;
-- 
2.19.2