The commit d931589c01a2 ("drm/exynos: remove DRM_EXYNOS_GEM_MAP_OFFSET
ioctl") removed it same with the ioctl that this patch adds. The reason
that removed DRM_EXYNOS_GEM_MAP_OFFSET was we could use
DRM_IOCTL_MODE_MAP_DUMB. Both did exactly same thing.

Now we again will revive it as DRM_EXYNOS_GEM_MAP because of render
node. DRM_IOCTL_MODE_MAP_DUMB isn't permitted in render node.

Signed-off-by: Joonyoung Shim <jy0922.shim at samsung.com>
---
 drivers/gpu/drm/exynos/exynos_drm_drv.c |  2 ++
 drivers/gpu/drm/exynos/exynos_drm_gem.c |  9 +++++++++
 drivers/gpu/drm/exynos/exynos_drm_gem.h |  4 ++++
 include/uapi/drm/exynos_drm.h           | 17 ++++++++++++++++-
 4 files changed, 31 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/exynos/exynos_drm_drv.c 
b/drivers/gpu/drm/exynos/exynos_drm_drv.c
index f0a5839..8fd7201 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_drv.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_drv.c
@@ -404,6 +404,8 @@ static const struct vm_operations_struct 
exynos_drm_gem_vm_ops = {
 static const struct drm_ioctl_desc exynos_ioctls[] = {
        DRM_IOCTL_DEF_DRV(EXYNOS_GEM_CREATE, exynos_drm_gem_create_ioctl,
                        DRM_UNLOCKED | DRM_AUTH | DRM_RENDER_ALLOW),
+       DRM_IOCTL_DEF_DRV(EXYNOS_GEM_MAP, exynos_drm_gem_map_ioctl,
+                       DRM_UNLOCKED | DRM_AUTH | DRM_RENDER_ALLOW),
        DRM_IOCTL_DEF_DRV(EXYNOS_GEM_GET, exynos_drm_gem_get_ioctl,
                        DRM_UNLOCKED | DRM_RENDER_ALLOW),
        DRM_IOCTL_DEF_DRV(EXYNOS_VIDI_CONNECTION, vidi_connection_ioctl,
diff --git a/drivers/gpu/drm/exynos/exynos_drm_gem.c 
b/drivers/gpu/drm/exynos/exynos_drm_gem.c
index f1dcdd0..29f4875 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_gem.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_gem.c
@@ -271,6 +271,15 @@ int exynos_drm_gem_create_ioctl(struct drm_device *dev, 
void *data,
        return 0;
 }

+int exynos_drm_gem_map_ioctl(struct drm_device *dev, void *data,
+                            struct drm_file *file_priv)
+{
+       struct drm_exynos_gem_map *args = data;
+
+       return exynos_drm_gem_dumb_map_offset(file_priv, dev, args->handle,
+                                             &args->offset);
+}
+
 dma_addr_t *exynos_drm_gem_get_dma_addr(struct drm_device *dev,
                                        unsigned int gem_handle,
                                        struct drm_file *filp)
diff --git a/drivers/gpu/drm/exynos/exynos_drm_gem.h 
b/drivers/gpu/drm/exynos/exynos_drm_gem.h
index 37ab8b2..0d0ab27 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_gem.h
+++ b/drivers/gpu/drm/exynos/exynos_drm_gem.h
@@ -73,6 +73,10 @@ struct exynos_drm_gem *exynos_drm_gem_create(struct 
drm_device *dev,
 int exynos_drm_gem_create_ioctl(struct drm_device *dev, void *data,
                                struct drm_file *file_priv);

+/* get fake-offset of gem object that can be used with mmap. */
+int exynos_drm_gem_map_ioctl(struct drm_device *dev, void *data,
+                            struct drm_file *file_priv);
+
 /*
  * get dma address from gem handle and this function could be used for
  * other drivers such as 2d/3d acceleration drivers.
diff --git a/include/uapi/drm/exynos_drm.h b/include/uapi/drm/exynos_drm.h
index 5575ed1..18f0601 100644
--- a/include/uapi/drm/exynos_drm.h
+++ b/include/uapi/drm/exynos_drm.h
@@ -33,6 +33,19 @@ struct drm_exynos_gem_create {
 };

 /**
+ * A structure for getting a fake-offset that can be used with mmap.
+ *
+ * @handle: handle of gem object.
+ * @reserved: just padding to be 64-bit aligned.
+ * @offset: a fake-offset of gem object.
+ */
+struct drm_exynos_gem_map {
+       __u32 handle;
+       __u32 reserved;
+       __u64 offset;
+};
+
+/**
  * A structure to gem information.
  *
  * @handle: a handle to gem object created.
@@ -284,6 +297,7 @@ struct drm_exynos_ipp_cmd_ctrl {
 };

 #define DRM_EXYNOS_GEM_CREATE          0x00
+#define DRM_EXYNOS_GEM_MAP             0x01
 /* Reserved 0x03 ~ 0x05 for exynos specific gem ioctl */
 #define DRM_EXYNOS_GEM_GET             0x04
 #define DRM_EXYNOS_VIDI_CONNECTION     0x07
@@ -301,7 +315,8 @@ struct drm_exynos_ipp_cmd_ctrl {

 #define DRM_IOCTL_EXYNOS_GEM_CREATE            DRM_IOWR(DRM_COMMAND_BASE + \
                DRM_EXYNOS_GEM_CREATE, struct drm_exynos_gem_create)
-
+#define DRM_IOCTL_EXYNOS_GEM_MAP               DRM_IOWR(DRM_COMMAND_BASE + \
+               DRM_EXYNOS_GEM_MAP, struct drm_exynos_gem_map)
 #define DRM_IOCTL_EXYNOS_GEM_GET       DRM_IOWR(DRM_COMMAND_BASE + \
                DRM_EXYNOS_GEM_GET,     struct drm_exynos_gem_info)

-- 
1.9.1

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