[PATCH 2/2] drm/xe/vm: move xe_svm_init() earlier
Matthew Auld
matthew.auld at intel.com
Wed May 14 15:24:26 UTC 2025
In xe_vm_close_and_put() we need to be able to call xe_svm_fini(),
however during vm creation we can call this on the error path, before
having actually initialised the svm state, leading to various splats
followed by a fatal NPD.
Fixes: 6fd979c2f331 ("drm/xe: Add SVM init / close / fini to faulting VMs")
Link: https://gitlab.freedesktop.org/drm/xe/kernel/-/issues/4967
Signed-off-by: Matthew Auld <matthew.auld at intel.com>
Cc: Matthew Brost <matthew.brost at intel.com>
---
drivers/gpu/drm/xe/xe_vm.c | 19 ++++++++++++-------
1 file changed, 12 insertions(+), 7 deletions(-)
diff --git a/drivers/gpu/drm/xe/xe_vm.c b/drivers/gpu/drm/xe/xe_vm.c
index 168756fb140b..7140d8856bad 100644
--- a/drivers/gpu/drm/xe/xe_vm.c
+++ b/drivers/gpu/drm/xe/xe_vm.c
@@ -1709,10 +1709,16 @@ struct xe_vm *xe_vm_create(struct xe_device *xe, u32 flags)
xe_pm_runtime_get_noresume(xe);
}
+ if (flags & XE_VM_FLAG_FAULT_MODE) {
+ err = xe_svm_init(vm);
+ if (err)
+ goto err_no_resv;
+ }
+
vm_resv_obj = drm_gpuvm_resv_object_alloc(&xe->drm);
if (!vm_resv_obj) {
err = -ENOMEM;
- goto err_no_resv;
+ goto err_svm_fini;
}
drm_gpuvm_init(&vm->gpuvm, "Xe VM", DRM_GPUVM_RESV_PROTECTED, &xe->drm,
@@ -1783,12 +1789,6 @@ struct xe_vm *xe_vm_create(struct xe_device *xe, u32 flags)
}
}
- if (flags & XE_VM_FLAG_FAULT_MODE) {
- err = xe_svm_init(vm);
- if (err)
- goto err_close;
- }
-
if (number_tiles > 1)
vm->composite_fence_ctx = dma_fence_context_alloc(1);
@@ -1802,6 +1802,11 @@ struct xe_vm *xe_vm_create(struct xe_device *xe, u32 flags)
xe_vm_close_and_put(vm);
return ERR_PTR(err);
+err_svm_fini:
+ if (flags & XE_VM_FLAG_FAULT_MODE) {
+ vm->size = 0; /* close the vm */
+ xe_svm_fini(vm);
+ }
err_no_resv:
mutex_destroy(&vm->snap_mutex);
for_each_tile(tile, xe, id)
--
2.49.0
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