[PATCH 2/5] drm/amdkfd: check child range to drain retry fault

[Philip Yang]

If unmapping partial range, the parent prange list op is update
notifier, child range list op is unmap range, need check child range to
set drain retry fault flag.

Signed-off-by: Philip Yang <Philip.Yang at amd.com>
---
 drivers/gpu/drm/amd/amdkfd/kfd_svm.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_svm.c b/drivers/gpu/drm/amd/amdkfd/kfd_svm.c
index 77239b06b236..64f642935600 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_svm.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_svm.c
@@ -2049,8 +2049,19 @@ svm_range_add_list_work(struct svm_range_list *svms, struct svm_range *prange,
 	 * before the range is freed to avoid straggler interrupts on
 	 * unmapped memory causing "phantom faults".
 	 */
-	if (op == SVM_OP_UNMAP_RANGE)
+	if (op == SVM_OP_UNMAP_RANGE) {
+		pr_debug("set range drain_pagefaults true\n");
 		svms->drain_pagefaults = true;
+	} else {
+		struct svm_range *pchild;
+
+		list_for_each_entry(pchild, &prange->child_list, child_list)
+			if (pchild->work_item.op == SVM_OP_UNMAP_RANGE) {
+				pr_debug("set child drain_pagefaults true\n");
+				svms->drain_pagefaults = true;
+			}
+	}
+
 	/* if prange is on the deferred list */
 	if (!list_empty(&prange->deferred_list)) {
 		pr_debug("update exist prange 0x%p work op %d\n", prange, op);
-- 
2.17.1