nvlink: Add fence mode emulation for NPUs

As NPUs are emulated PCI devices, they do not get physically fenced as real
PCI devices do.  As such, when the device is in a state that it should be
fenced, we need to emulate this behaviour by returning all 1s in config
space reads.

This will be utilised by error injection in subsequent patches.

Signed-off-by: Russell Currey <ruscur@russell.cc>
Acked-By: Alistair Popple <alistair@popple.id.au>
Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/include/npu.h b/include/npu.h
index 795b704..5d5135b 100644
--- a/include/npu.h
+++ b/include/npu.h
@@ -167,6 +167,7 @@ struct npu {
 	uint64_t		tve_cache[NPU_NUM_OF_PES];
 
 	bool			tx_zcal_complete[2];
+	bool			fenced;
 
 	struct phb		phb;
 };