video: tegra: nvmap: Add header file for nvmap_dmabuf unit

Refactor nvmap dmabuf code by creating header file for functions
exposed by the unit and make internal functions static.

JIRA TMM-5625

Change-Id: Ic5e99506a3362937dc5d1eb3bd05047c9ffdac6a
Signed-off-by: Pritesh Raithatha <praithatha@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/3203525
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>

drivers/video/tegra/nvmap/nvmap_alloc.c

@@ -18,6 +18,7 @@
 #include "nvmap_priv.h"
 #include "nvmap_alloc.h"
 #include "nvmap_alloc_int.h"
+#include "nvmap_dmabuf.h"
 
 bool nvmap_convert_carveout_to_iovmm;
 bool nvmap_convert_iovmm_to_carveout;

drivers/video/tegra/nvmap/nvmap_dev.c

@@ -45,6 +45,7 @@
 #include "nvmap_priv.h"
 #include "nvmap_alloc.h"
 #include "nvmap_ioctl.h"
+#include "nvmap_dmabuf.h"
 #include <linux/pagewalk.h>
 
 #define NVMAP_CARVEOUT_KILLER_RETRY_TIME 100 /* msecs */

drivers/video/tegra/nvmap/nvmap_dmabuf.c

@@ -33,6 +33,7 @@
 #include "nvmap_priv.h"
 #include "nvmap_ioctl.h"
 #include "nvmap_alloc.h"
+#include "nvmap_dmabuf.h"
 
 #define NVMAP_DMABUF_ATTACH  nvmap_dmabuf_attach
 
@@ -362,7 +363,7 @@ static int __nvmap_dmabuf_begin_cpu_access(struct dma_buf *dmabuf,
 #define NVMAP_DMABUF_BEGIN_CPU_ACCESS           __nvmap_dmabuf_begin_cpu_access
 #define NVMAP_DMABUF_END_CPU_ACCESS 		__nvmap_dmabuf_end_cpu_access
 
-int __nvmap_map(struct nvmap_handle *h, struct vm_area_struct *vma)
+static int __nvmap_map(struct nvmap_handle *h, struct vm_area_struct *vma)
 {
 	struct nvmap_vma_priv *priv;
 
@@ -554,7 +555,7 @@ err_nomem:
 	return ERR_PTR(err);
 }
 
-int __nvmap_dmabuf_fd(struct nvmap_client *client,
+static int __nvmap_dmabuf_fd(struct nvmap_client *client,
 		      struct dma_buf *dmabuf, int flags)
 {
 	int ret;

drivers/video/tegra/nvmap/nvmap_dmabuf.h

@@ -0,0 +1,28 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/* SPDX-FileCopyrightText: Copyright (c) 2024 NVIDIA CORPORATION & AFFILIATES. All rights reserved. */
+#ifndef __NVMAP_DMABUF_H
+#define __NVMAP_DMABUF_H
+
+int nvmap_dmabuf_stash_init(void);
+void nvmap_dmabuf_stash_deinit(void);
+
+bool dmabuf_is_nvmap(struct dma_buf *dmabuf);
+
+struct dma_buf *__nvmap_make_dmabuf(struct nvmap_client *client,
+					struct nvmap_handle *handle,
+					bool ro_buf);
+
+int nvmap_get_dmabuf_fd(struct nvmap_client *client,
+			struct nvmap_handle *h,
+			bool is_ro);
+
+struct nvmap_handle *nvmap_handle_get_from_dmabuf_fd(
+			struct nvmap_client *client,
+			int fd);
+
+int is_nvmap_dmabuf_fd_ro(int fd, bool *is_ro);
+
+int nvmap_dmabuf_duplicate_gen_fd(struct nvmap_client *client,
+					struct dma_buf *dmabuf);
+
+#endif /* __NVMAP_DMABUF_H */

drivers/video/tegra/nvmap/nvmap_handle.c

@@ -28,6 +28,7 @@
 #include "nvmap_priv.h"
 #include "nvmap_ioctl.h"
 #include "nvmap_alloc.h"
+#include "nvmap_dmabuf.h"
 
 /*
  * Verifies that the passed ID is a valid handle ID. Then the passed client's

drivers/video/tegra/nvmap/nvmap_ioctl.c

@@ -36,6 +36,7 @@
 #include "nvmap_ioctl.h"
 #include "nvmap_priv.h"
 #include "nvmap_alloc.h"
+#include "nvmap_dmabuf.h"
 
 #include <linux/syscalls.h>
 #include <linux/nodemask.h>

drivers/video/tegra/nvmap/nvmap_priv.h

@@ -462,8 +462,6 @@ struct nvmap_handle_ref *nvmap_create_handle_from_va(struct nvmap_client *client
 struct nvmap_handle_ref *nvmap_dup_handle_ro(struct nvmap_client *client,
 					int fd);
 
-int is_nvmap_dmabuf_fd_ro(int fd, bool *is_ro);
-
 int is_nvmap_id_ro(struct nvmap_client *client, int id, bool *is_ro);
 
 struct nvmap_handle_ref *nvmap_duplicate_handle(struct nvmap_client *client,
@@ -492,13 +490,6 @@ void nvmap_handle_add(struct nvmap_device *dev, struct nvmap_handle *h);
 
 int is_nvmap_vma(struct vm_area_struct *vma);
 
-int nvmap_get_dmabuf_fd(struct nvmap_client *client, struct nvmap_handle *h,
-			bool is_ro);
-struct nvmap_handle *nvmap_handle_get_from_dmabuf_fd(
-				struct nvmap_client *client, int fd);
-int nvmap_dmabuf_duplicate_gen_fd(struct nvmap_client *client,
-		struct dma_buf *dmabuf);
-
 int nvmap_get_handle_param(struct nvmap_client *client,
 		struct nvmap_handle_ref *ref, u32 param, u64 *result);
 
@@ -510,23 +501,14 @@ extern void v7_clean_kern_cache_all(void *);
 
 void nvmap_flush_cache(struct page **pages, int numpages);
 
-/* Internal API to support dmabuf */
-struct dma_buf *__nvmap_make_dmabuf(struct nvmap_client *client,
-				    struct nvmap_handle *handle, bool ro_buf);
 struct sg_table *__nvmap_sg_table(struct nvmap_client *client,
 				  struct nvmap_handle *h);
 void __nvmap_free_sg_table(struct nvmap_client *client,
 			   struct nvmap_handle *h, struct sg_table *sgt);
 void *__nvmap_mmap(struct nvmap_handle *h);
 void __nvmap_munmap(struct nvmap_handle *h, void *addr);
-int __nvmap_map(struct nvmap_handle *h, struct vm_area_struct *vma);
 struct nvmap_client *__nvmap_create_client(struct nvmap_device *dev,
 					   const char *name);
-int __nvmap_dmabuf_fd(struct nvmap_client *client,
-		      struct dma_buf *dmabuf, int flags);
-
-int nvmap_dmabuf_stash_init(void);
-void nvmap_dmabuf_stash_deinit(void);
 
 static inline bool nvmap_page_dirty(struct page *page)
 {
@@ -804,7 +786,6 @@ void nvmap_add_device_name(char *device_name, u64 dma_mask, u32 heap_type);
 void nvmap_remove_device_name(char *device_name, u32 heap_type);
 #endif /* NVMAP_CONFIG_DEBUG_MAPS */
 
-bool dmabuf_is_nvmap(struct dma_buf *dmabuf);
 struct nvmap_handle *nvmap_handle_get_from_id(struct nvmap_client *client,
 		u32 id);
 

drivers/video/tegra/nvmap/nvmap_sci_ipc.c

@@ -22,6 +22,7 @@
 #include <trace/events/nvmap.h>
 #include "nvmap_priv.h"
 #include "nvmap_sci_ipc.h"
+#include "nvmap_dmabuf.h"
 
 struct nvmap_sci_ipc {
 	struct rb_root entries;