drm/amdgpu: Extend full access wait time in guest

- Extend wait time and add retry, currently 6s * 2times
- Change timing algorithm
Signed-off-by: Victor Zhao <Victor.Zhao@amd.com>
Signed-off-by: Peng Ju Zhou <PengJu.Zhou@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/mxgpu_nv.c

@@ -96,7 +96,11 @@ static int xgpu_nv_poll_ack(struct amdgpu_device *adev)
 
 static int xgpu_nv_poll_msg(struct amdgpu_device *adev, enum idh_event event)
 {
-	int r, timeout = NV_MAILBOX_POLL_MSG_TIMEDOUT;
+	int r;
+	uint64_t timeout, now;
+
+	now = (uint64_t)ktime_to_ms(ktime_get());
+	timeout = now + NV_MAILBOX_POLL_MSG_TIMEDOUT;
 
 	do {
 		r = xgpu_nv_mailbox_rcv_msg(adev, event);
@@ -104,8 +108,8 @@ static int xgpu_nv_poll_msg(struct amdgpu_device *adev, enum idh_event event)
 			return 0;
 
 		msleep(10);
-		timeout -= 10;
-	} while (timeout > 1);
+		now = (uint64_t)ktime_to_ms(ktime_get());
+	} while (timeout > now);
 
 
 	return -ETIME;
@@ -149,9 +153,10 @@ static void xgpu_nv_mailbox_trans_msg (struct amdgpu_device *adev,
 static int xgpu_nv_send_access_requests(struct amdgpu_device *adev,
 					enum idh_request req)
 {
-	int r;
+	int r, retry = 1;
 	enum idh_event event = -1;
 
+send_request:
 	xgpu_nv_mailbox_trans_msg(adev, req, 0, 0, 0);
 
 	switch (req) {
@@ -170,6 +175,9 @@ static int xgpu_nv_send_access_requests(struct amdgpu_device *adev,
 	if (event != -1) {
 		r = xgpu_nv_poll_msg(adev, event);
 		if (r) {
+			if (retry++ < 2)
+				goto send_request;
+
 			if (req != IDH_REQ_GPU_INIT_DATA) {
 				pr_err("Doesn't get msg:%d from pf, error=%d\n", event, r);
 				return r;