[PATCH] drm/amdkfd: map gpu hive id to xgmi connected cpu

[Jonathan Kim]

ROCr needs to be able to identify all devices that have direct access to
fine grain memory, which should include CPUs that are connected to GPUs
over xGMI. The GPU hive ID can be mapped onto the CPU hive ID since the
CPU is part of the hive.

v3: avoid quadratic search by doing linear list read instead querying per
proximity id

v2: fixup to ensure all numa nodes get the hive id mapped

Signed-off-by: Jonathan Kim <jonathan.kim at amd.com>
---
 drivers/gpu/drm/amd/amdkfd/kfd_topology.c | 19 ++++++++++++++++++-
 1 file changed, 18 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_topology.c b/drivers/gpu/drm/amd/amdkfd/kfd_topology.c
index 98cca5f2b27f..dd593ad0614a 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_topology.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_topology.c
@@ -1296,6 +1296,24 @@ int kfd_topology_add_device(struct kfd_dev *gpu)
 
 	proximity_domain = atomic_inc_return(&topology_crat_proximity_domain);
 
+	adev = (struct amdgpu_device *)(gpu->kgd);
+
+	/* Include the CPU in xGMI hive if xGMI connected by assigning it the hive ID. */
+	if (gpu->hive_id && adev->gmc.xgmi.connected_to_cpu) {
+		struct kfd_topology_device *top_dev;
+
+		down_read(&topology_lock);
+
+		list_for_each_entry(top_dev, &topology_device_list, list) {
+			if (top_dev->gpu)
+				break;
+
+			top_dev->node_props.hive_id = gpu->hive_id;
+		}
+
+		up_read(&topology_lock);
+	}
+
 	/* Check to see if this gpu device exists in the topology_device_list.
 	 * If so, assign the gpu to that device,
 	 * else create a Virtual CRAT for this gpu device and then parse that
@@ -1457,7 +1475,6 @@ int kfd_topology_add_device(struct kfd_dev *gpu)
 		dev->node_props.max_waves_per_simd = 10;
 	}
 
-	adev = (struct amdgpu_device *)(dev->gpu->kgd);
 	/* kfd only concerns sram ecc on GFX and HBM ecc on UMC */
 	dev->node_props.capability |=
 		((adev->ras_enabled & BIT(AMDGPU_RAS_BLOCK__GFX)) != 0) ?
-- 
2.25.1