[PATCH] drm/amdgpu: Add MB_REQ_MSG_READY_TO_RESET response when VF get FLR notification.

[Peng Ju Zhou]

From: Jiange Zhao <Jiange.Zhao at amd.com>

When guest received FLR notification from host, it would
lock adapter into reset state. There will be no more
job submission and hardware access after that.

Then it should send a response to host that it has prepared
for host reset.

Signed-off-by: Jiange Zhao <Jiange.Zhao at amd.com>
Signed-off-by: Peng Ju Zhou <PengJu.Zhou at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/mxgpu_nv.c | 2 ++
 drivers/gpu/drm/amd/amdgpu/mxgpu_nv.h | 3 ++-
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/mxgpu_nv.c b/drivers/gpu/drm/amd/amdgpu/mxgpu_nv.c
index b48e68f46a5c..a35e6d87e537 100644
--- a/drivers/gpu/drm/amd/amdgpu/mxgpu_nv.c
+++ b/drivers/gpu/drm/amd/amdgpu/mxgpu_nv.c
@@ -287,6 +287,8 @@ static void xgpu_nv_mailbox_flr_work(struct work_struct *work)
 	amdgpu_virt_fini_data_exchange(adev);
 	atomic_set(&adev->in_gpu_reset, 1);
 
+	xgpu_nv_mailbox_trans_msg(adev, IDH_READY_TO_RESET, 0, 0, 0);
+
 	do {
 		if (xgpu_nv_mailbox_peek_msg(adev) == IDH_FLR_NOTIFICATION_CMPL)
 			goto flr_done;
diff --git a/drivers/gpu/drm/amd/amdgpu/mxgpu_nv.h b/drivers/gpu/drm/amd/amdgpu/mxgpu_nv.h
index 9f5808616174..73887b0aa1d6 100644
--- a/drivers/gpu/drm/amd/amdgpu/mxgpu_nv.h
+++ b/drivers/gpu/drm/amd/amdgpu/mxgpu_nv.h
@@ -37,7 +37,8 @@ enum idh_request {
 	IDH_REQ_GPU_RESET_ACCESS,
 	IDH_REQ_GPU_INIT_DATA,
 
-	IDH_LOG_VF_ERROR       = 200,
+	IDH_LOG_VF_ERROR	= 200,
+	IDH_READY_TO_RESET 	= 201,
 };
 
 enum idh_event {
-- 
2.17.1