RDMA/mlx5: Move xlt_emergency_page_mutex into mr.c

This is the only user, so remove the wrappers.

Link: https://lore.kernel.org/r/20201026132314.1336717-3-leon@kernel.orgSigned-off-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

drivers/infiniband/hw/mlx5/main.c

@@ -75,12 +75,6 @@ static LIST_HEAD(mlx5_ib_dev_list);
  */
 static DEFINE_MUTEX(mlx5_ib_multiport_mutex);
 
-/* We can't use an array for xlt_emergency_page because dma_map_single
- * doesn't work on kernel modules memory
- */
-static unsigned long xlt_emergency_page;
-static struct mutex xlt_emergency_page_mutex;
-
 struct mlx5_ib_dev *mlx5_ib_get_ibdev_from_mpi(struct mlx5_ib_multiport_info *mpi)
 {
 	struct mlx5_ib_dev *dev;
@@ -4804,17 +4798,6 @@ static struct mlx5_interface mlx5_ib_interface = {
 	.protocol	= MLX5_INTERFACE_PROTOCOL_IB,
 };
 
-unsigned long mlx5_ib_get_xlt_emergency_page(void)
-{
-	mutex_lock(&xlt_emergency_page_mutex);
-	return xlt_emergency_page;
-}
-
-void mlx5_ib_put_xlt_emergency_page(void)
-{
-	mutex_unlock(&xlt_emergency_page_mutex);
-}
-
 static int __init mlx5_ib_init(void)
 {
 	int err;
@@ -4823,8 +4806,6 @@ static int __init mlx5_ib_init(void)
 	if (!xlt_emergency_page)
 		return -ENOMEM;
 
-	mutex_init(&xlt_emergency_page_mutex);
-
 	mlx5_ib_event_wq = alloc_ordered_workqueue("mlx5_ib_event_wq", 0);
 	if (!mlx5_ib_event_wq) {
 		free_page(xlt_emergency_page);
@@ -4842,7 +4823,6 @@ static void __exit mlx5_ib_cleanup(void)
 {
 	mlx5_unregister_interface(&mlx5_ib_interface);
 	destroy_workqueue(mlx5_ib_event_wq);
-	mutex_destroy(&xlt_emergency_page_mutex);
 	free_page(xlt_emergency_page);
 }
 

drivers/infiniband/hw/mlx5/mlx5_ib.h

@@ -1454,8 +1454,7 @@ static inline int get_num_static_uars(struct mlx5_ib_dev *dev,
 	return get_uars_per_sys_page(dev, bfregi->lib_uar_4k) * bfregi->num_static_sys_pages;
 }
 
-unsigned long mlx5_ib_get_xlt_emergency_page(void);
-void mlx5_ib_put_xlt_emergency_page(void);
+extern unsigned long xlt_emergency_page;
 
 int bfregn_to_uar_index(struct mlx5_ib_dev *dev,
 			struct mlx5_bfreg_info *bfregi, u32 bfregn,

drivers/infiniband/hw/mlx5/mr.c

@@ -41,6 +41,13 @@
 #include <rdma/ib_verbs.h>
 #include "mlx5_ib.h"
 
+/*
+ * We can't use an array for xlt_emergency_page because dma_map_single doesn't
+ * work on kernel modules memory
+ */
+unsigned long xlt_emergency_page;
+static DEFINE_MUTEX(xlt_emergency_page_mutex);
+
 enum {
 	MAX_PENDING_REG_MR = 8,
 };
@@ -992,6 +999,17 @@ static struct mlx5_ib_mr *alloc_mr_from_cache(struct ib_pd *pd,
 			    MLX5_UMR_MTT_ALIGNMENT)
 #define MLX5_SPARE_UMR_CHUNK 0x10000
 
+static unsigned long mlx5_ib_get_xlt_emergency_page(void)
+{
+	mutex_lock(&xlt_emergency_page_mutex);
+	return xlt_emergency_page;
+}
+
+static void mlx5_ib_put_xlt_emergency_page(void)
+{
+	mutex_unlock(&xlt_emergency_page_mutex);
+}
+
 int mlx5_ib_update_xlt(struct mlx5_ib_mr *mr, u64 idx, int npages,
 		       int page_shift, int flags)
 {