[PATCH] drm/amdkfd: bind cpu and hiveless gpu to a hive if xgmi connected

[Alex Deucher]

From: Jonathan Kim <jonathan.kim at amd.com>

If a CPU and GPU are xGMI connected but the GPU is hiveless with
respect to other GPUs, create a new CPU-GPU hive using the GPU's PCI
device location ID as the new hive ID to maintain fine grain memory
access usage.

Signed-off-by: Jonathan Kim <jonathan.kim at amd.com>
Reviewed-by: Felix Kuehling <felix.kuehling at amd.com>
Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
---
 drivers/gpu/drm/amd/amdkfd/kfd_topology.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_topology.c b/drivers/gpu/drm/amd/amdkfd/kfd_topology.c
index 5373a79ac6a1..c7072fff778e 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_topology.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_topology.c
@@ -1328,8 +1328,15 @@ static void kfd_fill_iolink_non_crat_info(struct kfd_topology_device *dev)
 
 		/* Include the CPU peer in GPU hive if connected over xGMI. */
 		if (!peer_dev->gpu &&
-		    link->iolink_type == CRAT_IOLINK_TYPE_XGMI)
+		    link->iolink_type == CRAT_IOLINK_TYPE_XGMI) {
+			/*
+			 * If the GPU is not part of a GPU hive, use its pci
+			 * device location as the hive ID to bind with the CPU.
+			 */
+			if (!dev->node_props.hive_id)
+				dev->node_props.hive_id = pci_dev_id(dev->gpu->adev->pdev);
 			peer_dev->node_props.hive_id = dev->node_props.hive_id;
+		}
 
 		list_for_each_entry(inbound_link, &peer_dev->io_link_props,
 									list) {
-- 
2.39.2