[PATCH 3/3] drm/amdkfd: Fix a bug when calculating save_area_used_size

[Yong Zhao]

workgroup context data writes from m->cp_hqd_cntl_stack_size, so we
should deduct it when calculating the used size.

Change-Id: I5252e25662c3b8221f451c39115bf084d1911eae
Signed-off-by: Yong Zhao <Yong.Zhao at amd.com>
---
 drivers/gpu/drm/amd/amdkfd/kfd_mqd_manager_v9.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_mqd_manager_v9.c b/drivers/gpu/drm/amd/amdkfd/kfd_mqd_manager_v9.c
index d3380c5bdbde..3a2ee1f01aae 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_mqd_manager_v9.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_mqd_manager_v9.c
@@ -302,7 +302,8 @@ static int get_wave_state(struct mqd_manager *mm, void *mqd,
 
 	*ctl_stack_used_size = m->cp_hqd_cntl_stack_size -
 		m->cp_hqd_cntl_stack_offset;
-	*save_area_used_size = m->cp_hqd_wg_state_offset;
+	*save_area_used_size = m->cp_hqd_wg_state_offset -
+		m->cp_hqd_cntl_stack_size;;
 
 	if (copy_to_user(ctl_stack, mqd_ctl_stack, m->cp_hqd_cntl_stack_size))
 		return -EFAULT;
-- 
2.17.1