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X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 13 Nov 2025 18:46:28.5047 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: da261d7c-c606-4560-8fe9-08de22e4f4aa X-MS-Exchange-CrossTenant-Id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=f34e5979-57d9-4aaa-ad4d-b122a662184d;Ip=[4.158.2.129];Helo=[outbound-uk1.az.dlp.m.darktrace.com] X-MS-Exchange-CrossTenant-AuthSource: AMS0EPF000001A8.eurprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: VE1PR08MB5680 Content-Type: text/plain; charset="utf-8" The kernel BOs unnecessarily got added to the external objects list of drm_gpuvm, when mapping to GPU, which would have resulted in few extra CPU cycles being spent at the time of job submission as drm_exec_until_all_locked() loop iterates over all external objects. Kernel BOs are private to a VM and so they share the dma_resv object of the dummy GEM object created for a VM. Use of DRM_EXEC_IGNORE_DUPLICATES flag ensured the recursive locking of the dummy GEM object was ignored. Also no extra space got allocated to add fences to the dma_resv object of dummy GEM object. So no other impact apart from few extra CPU cycles. This commit sets the pointer to dma_resv object of GEM object of kernel BOs before they are mapped to GPU, to prevent them from being added to external objects list. Signed-off-by: Akash Goel Reviewed-by: Boris Brezillon Reviewed-by: Steven Price --- drivers/gpu/drm/panthor/panthor_gem.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/panthor/panthor_gem.c b/drivers/gpu/drm/pantho= r/panthor_gem.c index f369cc3e2a5f..10d255cccc09 100644 --- a/drivers/gpu/drm/panthor/panthor_gem.c +++ b/drivers/gpu/drm/panthor/panthor_gem.c @@ -145,6 +145,9 @@ panthor_kernel_bo_create(struct panthor_device *ptdev, = struct panthor_vm *vm, bo =3D to_panthor_bo(&obj->base); kbo->obj =3D &obj->base; bo->flags =3D bo_flags; + bo->exclusive_vm_root_gem =3D panthor_vm_root_gem(vm); + drm_gem_object_get(bo->exclusive_vm_root_gem); + bo->base.base.resv =3D bo->exclusive_vm_root_gem->resv; =20 if (vm =3D=3D panthor_fw_vm(ptdev)) debug_flags |=3D PANTHOR_DEBUGFS_GEM_USAGE_FLAG_FW_MAPPED; @@ -168,9 +171,6 @@ panthor_kernel_bo_create(struct panthor_device *ptdev, = struct panthor_vm *vm, goto err_free_va; =20 kbo->vm =3D panthor_vm_get(vm); - bo->exclusive_vm_root_gem =3D panthor_vm_root_gem(vm); - drm_gem_object_get(bo->exclusive_vm_root_gem); - bo->base.base.resv =3D bo->exclusive_vm_root_gem->resv; return kbo; =20 err_free_va: --=20 2.25.1