PCI: Support INTx masking on ConnectX-4 with firmware x.14.1100+

Mellanox devices were marked as having INTx masking ability broken.  As a
result, the VFIO driver fails to start when more than one device function
is passed-through to a VM if both have the same INTx pin.

Prior to Connect-IB, Mellanox devices exposed to the operating system one
PCI function per all ports.  Starting from Connect-IB, the devices are
function-per-port.  When passing the second function to a VM, VFIO will
fail to start.

Exclude ConnectX-4, ConnectX4-Lx and Connect-IB from the list of Mellanox
devices marked as having broken INTx masking:

- ConnectX-4 and ConnectX4-LX firmware version is checked. If INTx
  masking is supported, we unmark the broken INTx masking.
- Connect-IB does not support INTx currently so will not cause any
  problem.

[bhelgaas: call pci_disable_device() always, after iounmap()]
Fixes: 11e42532ada3 ("PCI: Assume all Mellanox devices have broken INTx masking")
Signed-off-by: Noa Osherovich <noaos@mellanox.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Or Gerlitz <ogerlitz@mellanox.com>
Reviewed-by: Gavin Shan <gwshan@linux.vnet.ibm.com>

diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index f0515b7..93b0312 100644 (file)
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -3209,13 +3209,25 @@ static u16 mellanox_broken_intx_devs[] = {
        PCI_DEVICE_ID_MELLANOX_CONNECTX2,
        PCI_DEVICE_ID_MELLANOX_CONNECTX3,
        PCI_DEVICE_ID_MELLANOX_CONNECTX3_PRO,
-       PCI_DEVICE_ID_MELLANOX_CONNECTIB,
-       PCI_DEVICE_ID_MELLANOX_CONNECTX4,
-       PCI_DEVICE_ID_MELLANOX_CONNECTX4_LX,
 };
 
+#define CONNECTX_4_CURR_MAX_MINOR 99
+#define CONNECTX_4_INTX_SUPPORT_MINOR 14
+
+/*
+ * Check ConnectX-4/LX FW version to see if it supports legacy interrupts.
+ * If so, don't mark it as broken.
+ * FW minor > 99 means older FW version format and no INTx masking support.
+ * FW minor < 14 means new FW version format and no INTx masking support.
+ */
 static void mellanox_check_broken_intx_masking(struct pci_dev *pdev)
 {
+       __be32 __iomem *fw_ver;
+       u16 fw_major;
+       u16 fw_minor;
+       u16 fw_subminor;
+       u32 fw_maj_min;
+       u32 fw_sub_min;
        int i;
 
        for (i = 0; i < ARRAY_SIZE(mellanox_broken_intx_devs); i++) {
@@ -3224,6 +3236,47 @@ static void mellanox_check_broken_intx_masking(struct pci_dev *pdev)
                        return;
                }
        }
+
+       /* Getting here means Connect-IB cards and up. Connect-IB has no INTx
+        * support so shouldn't be checked further
+        */
+       if (pdev->device == PCI_DEVICE_ID_MELLANOX_CONNECTIB)
+               return;
+
+       if (pdev->device != PCI_DEVICE_ID_MELLANOX_CONNECTX4 &&
+           pdev->device != PCI_DEVICE_ID_MELLANOX_CONNECTX4_LX)
+               return;
+
+       /* For ConnectX-4 and ConnectX-4LX, need to check FW support */
+       if (pci_enable_device_mem(pdev)) {
+               dev_warn(&pdev->dev, "Can't enable device memory\n");
+               return;
+       }
+
+       fw_ver = ioremap(pci_resource_start(pdev, 0), 4);
+       if (!fw_ver) {
+               dev_warn(&pdev->dev, "Can't map ConnectX-4 initialization segment\n");
+               goto out;
+       }
+
+       /* Reading from resource space should be 32b aligned */
+       fw_maj_min = ioread32be(fw_ver);
+       fw_sub_min = ioread32be(fw_ver + 1);
+       fw_major = fw_maj_min & 0xffff;
+       fw_minor = fw_maj_min >> 16;
+       fw_subminor = fw_sub_min & 0xffff;
+       if (fw_minor > CONNECTX_4_CURR_MAX_MINOR ||
+           fw_minor < CONNECTX_4_INTX_SUPPORT_MINOR) {
+               dev_warn(&pdev->dev, "ConnectX-4: FW %u.%u.%u doesn't support INTx masking, disabling. Please upgrade FW to %d.14.1100 and up for INTx support\n",
+                        fw_major, fw_minor, fw_subminor, pdev->device ==
+                        PCI_DEVICE_ID_MELLANOX_CONNECTX4 ? 12 : 14);
+               pdev->broken_intx_masking = 1;
+       }
+
+       iounmap(fw_ver);
+
+out:
+       pci_disable_device(pdev);
 }
 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_MELLANOX, PCI_ANY_ID,
                        mellanox_check_broken_intx_masking);