tegra: fd: Add wrapper for __alloc_fd

Modules like nvgpu and nvmap should to be able to allocate
all open fds and for this they need to call __alloc_fd()
rather than alloc_fd.
However, as __alloc_fd is not exported to modules, a wrapper
is being created and exported to the respective modules.

bug 200290850

Change-Id: Id245040842f71aadfc484711a23e8ce9dbfa872f
Signed-off-by: Pritesh Raithatha <praithatha@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1701552
GVS: Gerrit_Virtual_Submit
Reviewed-by: Sachin Nikam <snikam@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

4 files changed, 50 insertions, 1 deletions

diff --git a/NVIDIA-REVIEWERS b/NVIDIA-REVIEWERS
index 98b120eb8..eb92a6133 100644
--- a/NVIDIA-REVIEWERS
+++ b/NVIDIA-REVIEWERS
@@ -203,7 +203,6 @@ F:	drivers/platform/tegra/iomap_t18x.h
 F:      drivers/platform/tegra/mc/*
 F:      drivers/iommu/
 F:      drivers/video/tegra/nvmap/
-F:      drivers/platform/tegra/mc/
 F:      drivers/char/hmm_dmirror.h
 F:      drivers/char/hmm_dmirror.c
 F:      include/dt-bindings/memory/
diff --git a/drivers/platform/tegra/mc/Makefile b/drivers/platform/tegra/mc/Makefile
index 84aa938c1..cef249be3 100644
--- a/drivers/platform/tegra/mc/Makefile
+++ b/drivers/platform/tegra/mc/Makefile
@@ -30,6 +30,8 @@ obj-y                                   += tegra18_emc.o
 obj-y                                   += tegra18x_la.o
 obj-y                                   += tegra186-mc-sid.o
 
+obj-y                                   += tegra_fd.o
+
 ifdef CONFIG_ARCH_TEGRA_19x_SOC
 
 ccflags-y += -Werror
diff --git a/drivers/platform/tegra/mc/tegra_fd.c b/drivers/platform/tegra/mc/tegra_fd.c
new file mode 100644
index 000000000..fbc019f92
--- /dev/null
+++ b/drivers/platform/tegra/mc/tegra_fd.c
@@ -0,0 +1,25 @@
+/*
+ * Copyright (c) 2018, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ */
+
+#include <linux/fdtable.h>
+#include <linux/fs.h>
+
+#include <linux/platform/tegra/tegra_fd.h>
+
+/* allocates a free fd within [start, sysctl_nr_open) range */
+int tegra_alloc_fd(struct files_struct *files, unsigned int start,
+                   unsigned int flags)
+{
+        return __alloc_fd(files, start, sysctl_nr_open, flags);
+}
+EXPORT_SYMBOL_GPL(tegra_alloc_fd);
diff --git a/include/linux/platform/tegra/tegra_fd.h b/include/linux/platform/tegra/tegra_fd.h
new file mode 100644
index 000000000..c30daa03c
--- /dev/null
+++ b/include/linux/platform/tegra/tegra_fd.h
@@ -0,0 +1,23 @@
+/*
+ * Copyright (C) 2017-2018, NVIDIA Corporation.  All rights reserved.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <linux/fdtable.h>
+
+#ifndef __TEGRA_FD_H
+#define __TEGRA_FD_H
+
+int tegra_alloc_fd(struct files_struct *files, unsigned int start,
+                   unsigned int flags);
+
+#endif