From: Noa Osherovich <noaos@xxxxxxxxxxxx>
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@xxxxxxxxxxxx>
Signed-off-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
Reviewed-by: Or Gerlitz <ogerlitz@xxxxxxxxxxxx>
Reviewed-by: Gavin Shan <gwshan@xxxxxxxxxxxxxxxxxx>
---
drivers/pci/quirks.c | 57 +++++++++++++++++++++++++++++++++++++++++++++++---
1 file changed, 54 insertions(+), 3 deletions(-)
diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index f0515b7..496ca13 100644
--- 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 +3236,45 @@ 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");
+ return;
+ }
+
+ /* 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);
+ pci_disable_device(pdev);
}
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_MELLANOX, PCI_ANY_ID,
mellanox_check_broken_intx_masking);
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