[PATCH] drm/amdkfd: Optimize svm range map to GPU with XNACK on

[Philip Yang]

With XNACK on if svm_range_set_attr set the range access or
access_in_place attribute, we don't call svm_range_validate_and_map to
update GPU mapping. This avoids prefaulting the range pages on system
memory if the range is not prefetch to VRAM and not mapped to GPUs.

Signed-off-by: Philip Yang <philip.y...@amd.com>
---
 drivers/gpu/drm/amd/amdkfd/kfd_svm.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_svm.c 
b/drivers/gpu/drm/amd/amdkfd/kfd_svm.c
index 129ef44f41e9..af7594b1b4c6 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_svm.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_svm.c
@@ -734,7 +734,9 @@ svm_range_apply_attrs(struct kfd_process *p, struct 
svm_range *prange,
                case KFD_IOCTL_SVM_ATTR_ACCESS:
                case KFD_IOCTL_SVM_ATTR_ACCESS_IN_PLACE:
                case KFD_IOCTL_SVM_ATTR_NO_ACCESS:
-                       *update_mapping = true;
+                       if (!p->xnack_enabled)
+                               *update_mapping = true;
+
                        gpuidx = kfd_process_gpuidx_from_gpuid(p,
                                                               attrs[i].value);
                        if (attrs[i].type == KFD_IOCTL_SVM_ATTR_NO_ACCESS) {
-- 
2.35.1