[PATCH] drm/amdgpu/sriov: Add MB_REQ_MSG_READY_TO_RESET response

[jianzh at amd.com]

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

Add MB_REQ_MSG_READY_TO_RESET response when VF get FLR notification.
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>
---
 drivers/gpu/drm/amd/amdgpu/mxgpu_nv.c | 1 +
 drivers/gpu/drm/amd/amdgpu/mxgpu_nv.h | 3 ++-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/mxgpu_nv.c b/drivers/gpu/drm/amd/amdgpu/mxgpu_nv.c
index 48e588d3c409..117d22848ee4 100644
--- a/drivers/gpu/drm/amd/amdgpu/mxgpu_nv.c
+++ b/drivers/gpu/drm/amd/amdgpu/mxgpu_nv.c
@@ -277,6 +277,7 @@ static void xgpu_nv_mailbox_flr_work(struct work_struct *work)
 		return;
 
 	amdgpu_virt_fini_data_exchange(adev);
+	xgpu_nv_mailbox_trans_msg(adev, IDH_READY_TO_RESET, 0, 0, 0);
 	atomic_set(&adev->in_gpu_reset, 1);
 
 	do {
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 {
-- 
2.25.1