[PATCH] drm/tegra: Add tegra_gem_mmap2 to fix 64-bit offsets

[Sean Paul <seanpaul@xxxxxxxxxxxx>]

On 64-bit targets, tegra_gem_mmap doesn't return the
offset to userspace. As such, subsequent calls to mmap(2)
fail. Add a new tegra_gem_mmap2 ioctl to fix this.

Signed-off-by: Sean Paul <seanpaul@xxxxxxxxxxxx>
---
 drivers/gpu/drm/tegra/drm.c  | 21 +++++++++++++++++++++
 include/uapi/drm/tegra_drm.h |  8 ++++++++
 2 files changed, 29 insertions(+)

diff --git a/drivers/gpu/drm/tegra/drm.c b/drivers/gpu/drm/tegra/drm.c
index d4f8275..be5dbe7 100644
--- a/drivers/gpu/drm/tegra/drm.c
+++ b/drivers/gpu/drm/tegra/drm.c
@@ -343,6 +343,26 @@ static int tegra_gem_create(struct drm_device *drm, void *data,
 	return 0;
 }
 
+static int tegra_gem_mmap2(struct drm_device *drm, void *data,
+			  struct drm_file *file)
+{
+	struct drm_tegra_gem_mmap2 *args = data;
+	struct drm_gem_object *gem;
+	struct tegra_bo *bo;
+
+	gem = drm_gem_object_lookup(drm, file, args->handle);
+	if (!gem)
+		return -EINVAL;
+
+	bo = to_tegra_bo(gem);
+
+	args->offset = drm_vma_node_offset_addr(&bo->gem.vma_node);
+
+	drm_gem_object_unreference(gem);
+
+	return 0;
+}
+
 static int tegra_gem_mmap(struct drm_device *drm, void *data,
 			  struct drm_file *file)
 {
@@ -677,6 +697,7 @@ static const struct drm_ioctl_desc tegra_drm_ioctls[] = {
 	DRM_IOCTL_DEF_DRV(TEGRA_GEM_GET_TILING, tegra_gem_get_tiling, DRM_UNLOCKED),
 	DRM_IOCTL_DEF_DRV(TEGRA_GEM_SET_FLAGS, tegra_gem_set_flags, DRM_UNLOCKED),
 	DRM_IOCTL_DEF_DRV(TEGRA_GEM_GET_FLAGS, tegra_gem_get_flags, DRM_UNLOCKED),
+	DRM_IOCTL_DEF_DRV(TEGRA_GEM_MMAP2, tegra_gem_mmap2, DRM_UNLOCKED),
 #endif
 };
 
diff --git a/include/uapi/drm/tegra_drm.h b/include/uapi/drm/tegra_drm.h
index c15d781..9035257 100644
--- a/include/uapi/drm/tegra_drm.h
+++ b/include/uapi/drm/tegra_drm.h
@@ -167,6 +167,12 @@ struct drm_tegra_gem_get_flags {
 	__u32 flags;
 };
 
+struct drm_tegra_gem_mmap2 {
+	__u32 handle;
+	__u64 offset;
+};
+
+
 #define DRM_TEGRA_GEM_CREATE		0x00
 #define DRM_TEGRA_GEM_MMAP		0x01
 #define DRM_TEGRA_SYNCPT_READ		0x02
@@ -181,6 +187,7 @@ struct drm_tegra_gem_get_flags {
 #define DRM_TEGRA_GEM_GET_TILING	0x0b
 #define DRM_TEGRA_GEM_SET_FLAGS		0x0c
 #define DRM_TEGRA_GEM_GET_FLAGS		0x0d
+#define DRM_TEGRA_GEM_MMAP2		0x0e
 
 #define DRM_IOCTL_TEGRA_GEM_CREATE DRM_IOWR(DRM_COMMAND_BASE + DRM_TEGRA_GEM_CREATE, struct drm_tegra_gem_create)
 #define DRM_IOCTL_TEGRA_GEM_MMAP DRM_IOWR(DRM_COMMAND_BASE + DRM_TEGRA_GEM_MMAP, struct drm_tegra_gem_mmap)
@@ -196,5 +203,6 @@ struct drm_tegra_gem_get_flags {
 #define DRM_IOCTL_TEGRA_GEM_GET_TILING DRM_IOWR(DRM_COMMAND_BASE + DRM_TEGRA_GEM_GET_TILING, struct drm_tegra_gem_get_tiling)
 #define DRM_IOCTL_TEGRA_GEM_SET_FLAGS DRM_IOWR(DRM_COMMAND_BASE + DRM_TEGRA_GEM_SET_FLAGS, struct drm_tegra_gem_set_flags)
 #define DRM_IOCTL_TEGRA_GEM_GET_FLAGS DRM_IOWR(DRM_COMMAND_BASE + DRM_TEGRA_GEM_GET_FLAGS, struct drm_tegra_gem_get_flags)
+#define DRM_IOCTL_TEGRA_GEM_MMAP2 DRM_IOWR(DRM_COMMAND_BASE + DRM_TEGRA_GEM_MMAP2, struct drm_tegra_gem_mmap2)
 
 #endif
-- 
2.2.0.rc0.207.ga3a616c

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