[PATCH 4/4] drm/exynos: added a feature to get gem buffer information.

[Inki Dae]

this patch adds a feature to get a gem buffer information and user application
can get the gem buffer information simply in runtime through gem handle.

Signed-off-by: Inki Dae <inki.dae at samsung.com>
---
 drivers/gpu/drm/exynos/exynos_drm_drv.c |    2 ++
 drivers/gpu/drm/exynos/exynos_drm_gem.c |   26 ++++++++++++++++++++++++++
 drivers/gpu/drm/exynos/exynos_drm_gem.h |    4 ++++
 include/drm/exynos_drm.h                |   21 ++++++++++++++++++++-
 4 files changed, 52 insertions(+), 1 deletions(-)

diff --git a/drivers/gpu/drm/exynos/exynos_drm_drv.c b/drivers/gpu/drm/exynos/exynos_drm_drv.c
index 5bb0361..21658fa 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_drv.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_drv.c
@@ -213,6 +213,8 @@ static struct drm_ioctl_desc exynos_ioctls[] = {
 			exynos_drm_gem_mmap_ioctl, DRM_UNLOCKED | DRM_AUTH),
 	DRM_IOCTL_DEF_DRV(EXYNOS_GEM_USERPTR,
 			exynos_drm_gem_userptr_ioctl, DRM_UNLOCKED),
+	DRM_IOCTL_DEF_DRV(EXYNOS_GEM_GET,
+			exynos_drm_gem_get_ioctl, DRM_UNLOCKED),
 	DRM_IOCTL_DEF_DRV(EXYNOS_PLANE_SET_ZPOS, exynos_plane_set_zpos_ioctl,
 			DRM_UNLOCKED | DRM_AUTH),
 	DRM_IOCTL_DEF_DRV(EXYNOS_VIDI_CONNECTION,
diff --git a/drivers/gpu/drm/exynos/exynos_drm_gem.c b/drivers/gpu/drm/exynos/exynos_drm_gem.c
index b68d4ea..c3ffc9f 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_gem.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_gem.c
@@ -864,6 +864,32 @@ err_free_buffer:
 	return ret;
 }
 
+int exynos_drm_gem_get_ioctl(struct drm_device *dev, void *data,
+				      struct drm_file *file_priv)
+{	struct exynos_drm_gem_obj *exynos_gem_obj;
+	struct drm_exynos_gem_info *args = data;
+	struct drm_gem_object *obj;
+
+	mutex_lock(&dev->struct_mutex);
+
+	obj = drm_gem_object_lookup(dev, file_priv, args->handle);
+	if (!obj) {
+		DRM_ERROR("failed to lookup gem object.\n");
+		mutex_unlock(&dev->struct_mutex);
+		return -EINVAL;
+	}
+
+	exynos_gem_obj = to_exynos_gem_obj(obj);
+
+	args->flags = exynos_gem_obj->flags;
+	args->size = exynos_gem_obj->size;
+
+	drm_gem_object_unreference(obj);
+	mutex_unlock(&dev->struct_mutex);
+
+	return 0;
+}
+
 int exynos_drm_gem_init_object(struct drm_gem_object *obj)
 {
 	DRM_DEBUG_KMS("%s\n", __FILE__);
diff --git a/drivers/gpu/drm/exynos/exynos_drm_gem.h b/drivers/gpu/drm/exynos/exynos_drm_gem.h
index 1de2241..9f5eabe 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_gem.h
+++ b/drivers/gpu/drm/exynos/exynos_drm_gem.h
@@ -138,6 +138,10 @@ int exynos_drm_gem_mmap_ioctl(struct drm_device *dev, void *data,
 int exynos_drm_gem_userptr_ioctl(struct drm_device *dev, void *data,
 				      struct drm_file *file_priv);
 
+/* get buffer information to memory region allocated by gem. */
+int exynos_drm_gem_get_ioctl(struct drm_device *dev, void *data,
+				      struct drm_file *file_priv);
+
 /* initialize gem object. */
 int exynos_drm_gem_init_object(struct drm_gem_object *obj);
 
diff --git a/include/drm/exynos_drm.h b/include/drm/exynos_drm.h
index 48eda6e..63e7ee8 100644
--- a/include/drm/exynos_drm.h
+++ b/include/drm/exynos_drm.h
@@ -92,6 +92,21 @@ struct drm_exynos_gem_userptr {
 };
 
 /**
+ * A structure to gem information.
+ *
+ * @handle: a handle to gem object created.
+ * @flags: flag value including memory type and cache attribute and
+ *	this value would be set by driver.
+ * @size: size to memory region allocated by gem and this size would
+ *	be set by driver.
+ */
+struct drm_exynos_gem_info {
+	unsigned int handle;
+	unsigned int flags;
+	uint64_t size;
+};
+
+/**
  * A structure for user connection request of virtual display.
  *
  * @connection: indicate whether doing connetion or not by user.
@@ -132,7 +147,8 @@ enum e_drm_exynos_gem_mem_type {
 #define DRM_EXYNOS_GEM_MAP_OFFSET	0x01
 #define DRM_EXYNOS_GEM_MMAP		0x02
 #define DRM_EXYNOS_GEM_USERPTR		0x03
-/* Reserved 0x03 ~ 0x05 for exynos specific gem ioctl */
+#define DRM_EXYNOS_GEM_GET		0x04
+/* Reserved 0x04 ~ 0x05 for exynos specific gem ioctl */
 #define DRM_EXYNOS_PLANE_SET_ZPOS	0x06
 #define DRM_EXYNOS_VIDI_CONNECTION	0x07
 
@@ -148,6 +164,9 @@ enum e_drm_exynos_gem_mem_type {
 #define DRM_IOCTL_EXYNOS_GEM_USERPTR	DRM_IOWR(DRM_COMMAND_BASE + \
 		DRM_EXYNOS_GEM_USERPTR, struct drm_exynos_gem_userptr)
 
+#define DRM_IOCTL_EXYNOS_GEM_GET	DRM_IOWR(DRM_COMMAND_BASE + \
+		DRM_EXYNOS_GEM_GET,	struct drm_exynos_gem_info)
+
 #define DRM_IOCTL_EXYNOS_PLANE_SET_ZPOS	DRM_IOWR(DRM_COMMAND_BASE + \
 		DRM_EXYNOS_PLANE_SET_ZPOS, struct drm_exynos_plane_set_zpos)
 
-- 
1.7.4.1