drm/amdkfd: relax checks for over allocation of save area

Over allocation of save area is not fatal, only under allocation is.
ROCm has various components that independently claim authority over save
area size.

Unless KFD decides to claim single authority, relax size checks.

Signed-off-by: Jonathan Kim <jonathan.kim@amd.com>
Reviewed-by: Philip Yang <philip.yang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit 15bd495)
Cc: stable@vger.kernel.org

Author: jokim-amd

drivers/gpu/drm/amd/amdkfd/kfd_queue.c

@@ -297,16 +297,16 @@ int kfd_queue_acquire_buffers(struct kfd_process_device *pdd, struct queue_prope
 		goto out_err_unreserve;
 	}
 
-	if (properties->ctx_save_restore_area_size != topo_dev->node_props.cwsr_size) {
-		pr_debug("queue cwsr size 0x%x not equal to node cwsr size 0x%x\n",
+	if (properties->ctx_save_restore_area_size < topo_dev->node_props.cwsr_size) {
+		pr_debug("queue cwsr size 0x%x not sufficient for node cwsr size 0x%x\n",
 			properties->ctx_save_restore_area_size,
 			topo_dev->node_props.cwsr_size);
 		err = -EINVAL;
 		goto out_err_unreserve;
 	}
 
-	total_cwsr_size = (topo_dev->node_props.cwsr_size + topo_dev->node_props.debug_memory_size)
-			  * NUM_XCC(pdd->dev->xcc_mask);
+	total_cwsr_size = (properties->ctx_save_restore_area_size +
+			   topo_dev->node_props.debug_memory_size) * NUM_XCC(pdd->dev->xcc_mask);
 	total_cwsr_size = ALIGN(total_cwsr_size, PAGE_SIZE);
 
 	err = kfd_queue_buffer_get(vm, (void *)properties->ctx_save_restore_area_address,
@@ -352,8 +352,8 @@ int kfd_queue_release_buffers(struct kfd_process_device *pdd, struct queue_prope
 	topo_dev = kfd_topology_device_by_id(pdd->dev->id);
 	if (!topo_dev)
 		return -EINVAL;
-	total_cwsr_size = (topo_dev->node_props.cwsr_size + topo_dev->node_props.debug_memory_size)
-			  * NUM_XCC(pdd->dev->xcc_mask);
+	total_cwsr_size = (properties->ctx_save_restore_area_size +
+			   topo_dev->node_props.debug_memory_size) * NUM_XCC(pdd->dev->xcc_mask);
 	total_cwsr_size = ALIGN(total_cwsr_size, PAGE_SIZE);
 
 	kfd_queue_buffer_svm_put(pdd, properties->ctx_save_restore_area_address, total_cwsr_size);