[RFC 12/12] drm/xe/vm: Add debug prints for SVM range prefetch

[Himal Prasad Ghimiray]

Introduce debug logs for the prefetch operation of SVM ranges.

Signed-off-by: Himal Prasad Ghimiray <himal.prasad.ghimiray at intel.com>
---
 drivers/gpu/drm/xe/xe_vm.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/xe/xe_vm.c b/drivers/gpu/drm/xe/xe_vm.c
index a1607283a5fe..b2b0824b8777 100644
--- a/drivers/gpu/drm/xe/xe_vm.c
+++ b/drivers/gpu/drm/xe/xe_vm.c
@@ -2372,6 +2372,7 @@ vm_bind_ioctl_ops_create(struct xe_vm *vm, struct xe_vma_ops *vops,
 			xa_store(&op->prefetch_range.range, i, svm_range, GFP_KERNEL);
 			op->prefetch_range.ranges_count++;
 			vops->flags |= XE_VMA_OPS_HAS_SVM_PREFETCH;
+			xe_svm_range_debug(svm_range, "PREFETCH - RANGE CREATED");
 
 			if (range_end > xe_svm_range_end(svm_range) &&
 			    xe_svm_range_end(svm_range) < xe_vma_end(vma)) {
@@ -2869,6 +2870,7 @@ static int prefetch_ranges_lock_and_prep(struct xe_vm *vm,
 						vm->usm.asid, (u64)&vm->svm.gpusvm, err);
 					return -ENODATA;
 				}
+				xe_svm_range_debug(svm_range, "PREFETCH - RANGE MIGRATED TO VRAM");
 			}
 
 			err = xe_svm_range_get_pages(vm, svm_range, &ctx);
@@ -2878,8 +2880,11 @@ static int prefetch_ranges_lock_and_prep(struct xe_vm *vm,
 
 				drm_err(&vm->xe->drm, "Get pages failed, asid=%u, gpusvm=0x%016llx, errno %d\n",
 					vm->usm.asid, (u64)&vm->svm.gpusvm, err);
-				return err;
+				err = -ENODATA;
 			}
+			if (err)
+				return err;
+			xe_svm_range_debug(svm_range, "PREFETCH - RANGE GET PAGES DONE");
 		}
 	}
 	return err;
-- 
2.34.1