diff --git a/store/copr/batch_coprocessor.go b/store/copr/batch_coprocessor.go
index 5506c9d497ac2..ef3bcee5719ed 100644
--- a/store/copr/batch_coprocessor.go
+++ b/store/copr/batch_coprocessor.go
@@ -176,7 +176,7 @@ func (c *CopClient) sendBatch(ctx context.Context, req *kv.Request, vars *tikv.V
 	if req.KeepOrder || req.Desc {
 		return copErrorResponse{errors.New("batch coprocessor cannot prove keep order or desc property")}
 	}
-	ctx = context.WithValue(ctx, tikv.TxnStartKey, req.StartTs)
+	ctx = context.WithValue(ctx, tikv.TxnStartKey(), req.StartTs)
 	bo := newBackofferWithVars(ctx, copBuildTaskMaxBackoff, vars)
 	ranges := toTiKVKeyRanges(req.KeyRanges)
 	tasks, err := buildBatchCopTasks(bo, c.store.GetRegionCache(), ranges, req.StoreType)
@@ -386,7 +386,7 @@ func (b *batchCopIterator) handleStreamedBatchCopResponse(ctx context.Context, b
 				return nil
 			}
 
-			if err1 := bo.Backoff(tikv.BoTiKVRPC, errors.Errorf("recv stream response error: %v, task store addr: %s", err, task.storeAddr)); err1 != nil {
+			if err1 := bo.b.BackoffTiKVRPC(errors.Errorf("recv stream response error: %v, task store addr: %s", err, task.storeAddr)); err1 != nil {
 				return errors.Trace(err)
 			}
 
diff --git a/store/copr/coprocessor.go b/store/copr/coprocessor.go
index cb799edb16f70..f32146bea82ee 100644
--- a/store/copr/coprocessor.go
+++ b/store/copr/coprocessor.go
@@ -73,7 +73,7 @@ func (c *CopClient) Send(ctx context.Context, req *kv.Request, variables interfa
 		logutil.BgLogger().Debug("send batch requests")
 		return c.sendBatch(ctx, req, vars)
 	}
-	ctx = context.WithValue(ctx, tikv.TxnStartKey, req.StartTs)
+	ctx = context.WithValue(ctx, tikv.TxnStartKey(), req.StartTs)
 	bo := newBackofferWithVars(ctx, copBuildTaskMaxBackoff, vars)
 	ranges := toTiKVKeyRanges(req.KeyRanges)
 	tasks, err := buildCopTasks(bo, c.store.GetRegionCache(), ranges, req)
@@ -830,11 +830,14 @@ func (worker *copIteratorWorker) handleCopStreamResult(bo *backoffer, rpcCtx *ti
 				return nil, nil
 			}
 
-			boRPCType := tikv.BoTiKVRPC
+			err1 := errors.Errorf("recv stream response error: %v, task: %s", err, task)
 			if task.storeType == kv.TiFlash {
-				boRPCType = tikv.BoTiFlashRPC
+				err1 = bo.Backoff(tikv.BoTiFlashRPC, err1)
+			} else {
+				err1 = bo.b.BackoffTiKVRPC(err1)
 			}
-			if err1 := bo.Backoff(boRPCType, errors.Errorf("recv stream response error: %v, task: %s", err, task)); err1 != nil {
+
+			if err1 != nil {
 				return nil, errors.Trace(err)
 			}
 
diff --git a/store/copr/mpp.go b/store/copr/mpp.go
index 3ea07e744f9b9..812638411fd3d 100644
--- a/store/copr/mpp.go
+++ b/store/copr/mpp.go
@@ -56,7 +56,7 @@ func (c *MPPClient) selectAllTiFlashStore() []kv.MPPTaskMeta {
 
 // ConstructMPPTasks receives ScheduleRequest, which are actually collects of kv ranges. We allocates MPPTaskMeta for them and returns.
 func (c *MPPClient) ConstructMPPTasks(ctx context.Context, req *kv.MPPBuildTasksRequest) ([]kv.MPPTaskMeta, error) {
-	ctx = context.WithValue(ctx, tikv.TxnStartKey, req.StartTS)
+	ctx = context.WithValue(ctx, tikv.TxnStartKey(), req.StartTS)
 	bo := newBackofferWithVars(ctx, copBuildTaskMaxBackoff, nil)
 	if req.KeyRanges == nil {
 		return c.selectAllTiFlashStore(), nil
@@ -344,7 +344,7 @@ func (m *mppIterator) establishMPPConns(bo *backoffer, req *kv.MPPDispatchReques
 				return
 			}
 
-			if err1 := bo.Backoff(tikv.BoTiKVRPC, errors.Errorf("recv stream response error: %v", err)); err1 != nil {
+			if err1 := bo.b.BackoffTiKVRPC(errors.Errorf("recv stream response error: %v", err)); err1 != nil {
 				if errors.Cause(err) == context.Canceled {
 					logutil.BgLogger().Info("stream recv timeout", zap.Error(err))
 				} else {
diff --git a/store/gcworker/gc_worker_test.go b/store/gcworker/gc_worker_test.go
index 3bfd616929aec..bc09651e0d379 100644
--- a/store/gcworker/gc_worker_test.go
+++ b/store/gcworker/gc_worker_test.go
@@ -43,6 +43,7 @@ import (
 	"github.com/pingcap/tidb/store/tikv/mockstore/mocktikv"
 	"github.com/pingcap/tidb/store/tikv/oracle"
 	"github.com/pingcap/tidb/store/tikv/oracle/oracles"
+	"github.com/pingcap/tidb/store/tikv/retry"
 	"github.com/pingcap/tidb/store/tikv/tikvrpc"
 	pd "github.com/tikv/pd/client"
 )
@@ -412,7 +413,7 @@ func (s *testGCWorkerSuite) TestStatusVars(c *C) {
 
 func (s *testGCWorkerSuite) TestDoGCForOneRegion(c *C) {
 	ctx := context.Background()
-	bo := tikv.NewBackofferWithVars(ctx, tikv.GcOneRegionMaxBackoff, nil)
+	bo := tikv.NewBackofferWithVars(ctx, gcOneRegionMaxBackoff, nil)
 	loc, err := s.tikvStore.GetRegionCache().LocateKey(bo, []byte(""))
 	c.Assert(err, IsNil)
 	var regionErr *errorpb.Error
@@ -943,7 +944,7 @@ func (s *testGCWorkerSuite) TestResolveLockRangeMeetRegionEnlargeCausedByRegionM
 			mCluster.Merge(s.initRegion.regionID, region2)
 			regionMeta, _ := mCluster.GetRegion(s.initRegion.regionID)
 			err := s.tikvStore.GetRegionCache().OnRegionEpochNotMatch(
-				tikv.NewNoopBackoff(context.Background()),
+				retry.NewNoopBackoff(context.Background()),
 				&tikv.RPCContext{Region: regionID, Store: &tikv.Store{}},
 				[]*metapb.Region{regionMeta})
 			c.Assert(err, IsNil)
diff --git a/store/tikv/backoff.go b/store/tikv/backoff.go
index c471ccc16167a..c622e21d2ee5d 100644
--- a/store/tikv/backoff.go
+++ b/store/tikv/backoff.go
@@ -29,7 +29,6 @@ type BackoffType = retry.BackoffType
 // Back off types.
 const (
 	BoRegionMiss  = retry.BoRegionMiss
-	BoTiKVRPC     = retry.BoTiKVRPC
 	BoTiFlashRPC  = retry.BoTiFlashRPC
 	BoTxnLockFast = retry.BoTxnLockFast
 	BoTxnLock     = retry.BoTxnLock
diff --git a/store/tikv/client_batch.go b/store/tikv/client_batch.go
index 70f1cf27ccacc..e5ec039fc6911 100644
--- a/store/tikv/client_batch.go
+++ b/store/tikv/client_batch.go
@@ -673,7 +673,7 @@ func (c *batchCommandsClient) recreateStreamingClient(err error, streamClient *b
 			break
 		}
 
-		err2 := b.Backoff(retry.BoTiKVRPC, err1)
+		err2 := b.BackoffTiKVRPC(err1)
 		// As timeout is set to math.MaxUint32, err2 should always be nil.
 		// This line is added to make the 'make errcheck' pass.
 		terror.Log(err2)
diff --git a/store/tikv/region_request.go b/store/tikv/region_request.go
index 9aa55baa64cfb..ec5b92f81c5ad 100644
--- a/store/tikv/region_request.go
+++ b/store/tikv/region_request.go
@@ -580,7 +580,7 @@ func (s *RegionRequestSender) onSendFail(bo *Backoffer, ctx *RPCContext, err err
 	if ctx.Store != nil && ctx.Store.storeType == tikvrpc.TiFlash {
 		err = bo.Backoff(retry.BoTiFlashRPC, errors.Errorf("send tiflash request error: %v, ctx: %v, try next peer later", err, ctx))
 	} else {
-		err = bo.Backoff(retry.BoTiKVRPC, errors.Errorf("send tikv request error: %v, ctx: %v, try next peer later", err, ctx))
+		err = bo.BackoffTiKVRPC(errors.Errorf("send tikv request error: %v, ctx: %v, try next peer later", err, ctx))
 	}
 	return errors.Trace(err)
 }
diff --git a/store/tikv/retry/backoff.go b/store/tikv/retry/backoff.go
index b2e0137902bce..a1a7c0619537f 100644
--- a/store/tikv/retry/backoff.go
+++ b/store/tikv/retry/backoff.go
@@ -49,7 +49,7 @@ const (
 func (t BackoffType) metric() prometheus.Observer {
 	switch t {
 	// TODO: distinguish tikv and tiflash in metrics
-	case BoTiKVRPC, BoTiFlashRPC:
+	case boTiKVRPC, BoTiFlashRPC:
 		return metrics.BackoffHistogramRPC
 	case BoTxnLock:
 		return metrics.BackoffHistogramLock
@@ -121,7 +121,7 @@ type BackoffType int
 
 // Back off types.
 const (
-	BoTiKVRPC BackoffType = iota
+	boTiKVRPC BackoffType = iota
 	BoTiFlashRPC
 	BoTxnLock
 	BoTxnLockFast
@@ -139,7 +139,7 @@ func (t BackoffType) createFn(vars *kv.Variables) func(context.Context, int) int
 		vars.Hook(t.String(), vars)
 	}
 	switch t {
-	case BoTiKVRPC, BoTiFlashRPC:
+	case boTiKVRPC, BoTiFlashRPC:
 		return NewBackoffFn(100, 2000, EqualJitter)
 	case BoTxnLock:
 		return NewBackoffFn(200, 3000, EqualJitter)
@@ -164,7 +164,7 @@ func (t BackoffType) createFn(vars *kv.Variables) func(context.Context, int) int
 
 func (t BackoffType) String() string {
 	switch t {
-	case BoTiKVRPC:
+	case boTiKVRPC:
 		return "tikvRPC"
 	case BoTiFlashRPC:
 		return "tiflashRPC"
@@ -193,7 +193,7 @@ func (t BackoffType) String() string {
 // TError returns pingcap/error of the backoff type.
 func (t BackoffType) TError() error {
 	switch t {
-	case BoTiKVRPC:
+	case boTiKVRPC:
 		return tikverr.ErrTiKVServerTimeout
 	case BoTiFlashRPC:
 		return tikverr.ErrTiFlashServerTimeout
@@ -279,6 +279,11 @@ func (b *Backoffer) Backoff(typ BackoffType, err error) error {
 	return b.BackoffWithMaxSleep(typ, -1, err)
 }
 
+// BackoffTiKVRPC calls Backoff with boTiKVRPC.
+func (b *Backoffer) BackoffTiKVRPC(err error) error {
+	return b.Backoff(boTiKVRPC, err)
+}
+
 // BackoffWithMaxSleep sleeps a while base on the backoffType and records the error message
 // and never sleep more than maxSleepMs for each sleep.
 func (b *Backoffer) BackoffWithMaxSleep(typ BackoffType, maxSleepMs int, err error) error {