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authorSam Bobroff <sbobroff@linux.ibm.com>2020-03-31 15:12:46 +1100
committerAlex Williamson <alex.williamson@redhat.com>2020-04-01 13:50:46 -0600
commit00bc5095547ef9878324167fe0c3e56f7b388159 (patch)
treec388045822aeb1be705d9b1a3ee3d2b92bed989a /drivers/vfio/pci
parent48219795e7dbd3d4850f5bf47fa3e37c9c2a561b (diff)
downloadlinux-00bc5095547ef9878324167fe0c3e56f7b388159.tar.bz2
vfio-pci/nvlink2: Allow fallback to ibm,mmio-atsd[0]
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: 7f92891778df ("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>
Diffstat (limited to 'drivers/vfio/pci')
-rw-r--r--drivers/vfio/pci/vfio_pci_nvlink2.c10
1 files changed, 8 insertions, 2 deletions
diff --git a/drivers/vfio/pci/vfio_pci_nvlink2.c b/drivers/vfio/pci/vfio_pci_nvlink2.c
index df4d96038cd4..ed20d73cc27c 100644
--- a/drivers/vfio/pci/vfio_pci_nvlink2.c
+++ b/drivers/vfio/pci/vfio_pci_nvlink2.c
@@ -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)) {