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vfio-pci/nvlink2: Allow fallback to ibm,mmio-atsd[0]

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Older versions of skiboot only provide a single value in the device
tree property "ibm,mmio-atsd", even when multiple Address Translation
Shoot Down (ATSD) registers are present. This prevents NVLink2 devices
(other than the first) from being used with vfio-pci because vfio-pci
expects to be able to assign a dedicated ATSD register to each NVLink2
device.

However, ATSD registers can be shared among devices. This change
allows vfio-pci to fall back to sharing the register at index 0 if
necessary.

Fixes: 7f92891778 ("vfio_pci: Add NVIDIA GV100GL [Tesla V100 SXM2] subdriver")
Signed-off-by: Sam Bobroff <sbobroff@linux.ibm.com>
Reviewed-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Sam Bobroff 2020-03-31 15:12:46 +11:00 committed by Alex Williamson
parent 48219795e7
commit 00bc509554
1 changed files with 8 additions and 2 deletions
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10
drivers/vfio/pci/vfio_pci_nvlink2.c
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@ -422,8 +422,14 @@ int vfio_pci_ibm_npu2_init(struct vfio_pci_device *vdev)
if (of_property_read_u64_index(hose->dn, "ibm,mmio-atsd", nvlink_index,
&mmio_atsd)) {
dev_warn(&vdev->pdev->dev, "No available ATSD found\n");
mmio_atsd = 0;
if (of_property_read_u64_index(hose->dn, "ibm,mmio-atsd", 0,
&mmio_atsd)) {
dev_warn(&vdev->pdev->dev, "No available ATSD found\n");
mmio_atsd = 0;
} else {
dev_warn(&vdev->pdev->dev,
"Using fallback ibm,mmio-atsd[0] for ATSD.\n");
}
}
if (of_property_read_u64(npu_node, "ibm,device-tgt-addr", &tgt)) {