drm/rockchip: Add GEM create ioctl support

Rockchip Socs have GPU, we need allocate GPU accelerated buffers.
So add special ioctls GEM_CREATE to support
accelerated buffers.

Signed-off-by: Mark Yao <mark.yao@rock-chips.com>
Reviewed-by: Daniel Kurtz <djkurtz@chromium.org>
Tested-by: Daniel Kurtz <djkurtz@chromium.org>

drivers/gpu/drm/rockchip/rockchip_drm_drv.c

@@ -24,6 +24,8 @@
 #include <linux/of_graph.h>
 #include <linux/component.h>
 
+#include <drm/rockchip_drm.h>
+
 #include "rockchip_drm_drv.h"
 #include "rockchip_drm_fb.h"
 #include "rockchip_drm_fbdev.h"
@@ -253,6 +255,11 @@ void rockchip_drm_lastclose(struct drm_device *dev)
 	drm_fb_helper_restore_fbdev_mode_unlocked(&priv->fbdev_helper);
 }
 
+static const struct drm_ioctl_desc rockchip_ioctls[] = {
+	DRM_IOCTL_DEF_DRV(ROCKCHIP_GEM_CREATE, rockchip_gem_create_ioctl,
+			  DRM_UNLOCKED | DRM_AUTH),
+};
+
 static const struct file_operations rockchip_drm_driver_fops = {
 	.owner = THIS_MODULE,
 	.open = drm_open,
@@ -292,6 +299,8 @@ static struct drm_driver rockchip_drm_driver = {
 	.gem_prime_vmap		= rockchip_gem_prime_vmap,
 	.gem_prime_vunmap	= rockchip_gem_prime_vunmap,
 	.gem_prime_mmap		= rockchip_gem_mmap_buf,
+	.ioctls			= rockchip_ioctls,
+	.num_ioctls		= ARRAY_SIZE(rockchip_ioctls),
 	.fops			= &rockchip_drm_driver_fops,
 	.name	= DRIVER_NAME,
 	.desc	= DRIVER_DESC,

drivers/gpu/drm/rockchip/rockchip_drm_gem.c

@@ -16,6 +16,7 @@
 #include <drm/drmP.h>
 #include <drm/drm_gem.h>
 #include <drm/drm_vma_manager.h>
+#include <drm/rockchip_drm.h>
 
 #include <linux/dma-attrs.h>
 
@@ -253,6 +254,17 @@ int rockchip_gem_dumb_create(struct drm_file *file_priv,
 	return PTR_ERR_OR_ZERO(rk_obj);
 }
 
+int rockchip_gem_create_ioctl(struct drm_device *dev, void *data,
+			      struct drm_file *file_priv)
+{
+	struct drm_rockchip_gem_create *args = data;
+	struct rockchip_gem_object *rk_obj;
+
+	rk_obj = rockchip_gem_create_with_handle(file_priv, dev, args->size,
+						 &args->handle);
+	return PTR_ERR_OR_ZERO(rk_obj);
+}
+
 /*
  * Allocate a sg_table for this GEM object.
  * Note: Both the table's contents, and the sg_table itself must be freed by

drivers/gpu/drm/rockchip/rockchip_drm_gem.h

@@ -52,4 +52,16 @@ int rockchip_gem_dumb_create(struct drm_file *file_priv,
 int rockchip_gem_dumb_map_offset(struct drm_file *file_priv,
 				 struct drm_device *dev, uint32_t handle,
 				 uint64_t *offset);
+/*
+ * request gem object creation and buffer allocation as the size
+ * that it is calculated with framebuffer information such as width,
+ * height and bpp.
+ */
+int rockchip_gem_create_ioctl(struct drm_device *dev, void *data,
+			      struct drm_file *file_priv);
+
+/* get buffer offset to map to user space. */
+int rockchip_gem_map_offset_ioctl(struct drm_device *dev, void *data,
+				  struct drm_file *file_priv);
+
 #endif /* _ROCKCHIP_DRM_GEM_H */

include/uapi/drm/rockchip_drm.h

@@ -0,0 +1,57 @@
+/*
+ *
+ * Copyright (c) Fuzhou Rockchip Electronics Co.Ltd
+ * Authors:
+ *       Mark Yao <yzq@rock-chips.com>
+ *
+ * base on exynos_drm.h
+ *
+ * This program is free software; you can redistribute  it and/or modify it
+ * under  the terms of  the GNU General  Public License as published by the
+ * Free Software Foundation;  either version 2 of the  License, or (at your
+ * option) any later version.
+ */
+
+#ifndef _UAPI_ROCKCHIP_DRM_H
+#define _UAPI_ROCKCHIP_DRM_H
+
+#include <drm/drm.h>
+
+/**
+ * User-desired buffer creation information structure.
+ *
+ * @size: user-desired memory allocation size.
+ * @flags: user request for setting memory type or cache attributes.
+ * @handle: returned a handle to created gem object.
+ *     - this handle will be set by gem module of kernel side.
+ */
+struct drm_rockchip_gem_create {
+	uint64_t size;
+	uint32_t flags;
+	uint32_t handle;
+};
+
+/**
+ * A structure for getting buffer offset.
+ *
+ * @handle: a pointer to gem object created.
+ * @pad: just padding to be 64-bit aligned.
+ * @offset: relatived offset value of the memory region allocated.
+ *     - this value should be set by user.
+ */
+struct drm_rockchip_gem_map_off {
+	uint32_t handle;
+	uint32_t pad;
+	uint64_t offset;
+};
+
+#define DRM_ROCKCHIP_GEM_CREATE		0x00
+#define DRM_ROCKCHIP_GEM_MAP_OFFSET	0x01
+
+#define DRM_IOCTL_ROCKCHIP_GEM_CREATE	DRM_IOWR(DRM_COMMAND_BASE + \
+		DRM_ROCKCHIP_GEM_CREATE, struct drm_rockchip_gem_create)
+
+#define DRM_IOCTL_ROCKCHIP_GEM_MAP_OFFSET	DRM_IOWR(DRM_COMMAND_BASE + \
+		DRM_ROCKCHIP_GEM_MAP_OFFSET, struct drm_rockchip_gem_map_off)
+
+#endif /* _UAPI_ROCKCHIP_DRM_H */