drm/hisilicon/hibmc: Add support for frame buffer

Add support for fbdev and kms fb management.

Signed-off-by: Rongrong Zou <zourongrong@gmail.com>
Reviewed-by: Sean Paul <seanpaul@chromium.org>
Reviewed-by: Xinliang Liu <xinliang.liu@linaro.org>
Acked-by: Sean Paul <seanpaul@chromium.org>

1 files changed, 67 insertions, 0 deletions

diff --git a/drivers/gpu/drm/hisilicon/hibmc/hibmc_ttm.c b/drivers/gpu/drm/hisilicon/hibmc/hibmc_ttm.c
index 036d3ac06e54..3ff65f4f5620 100644
--- a/drivers/gpu/drm/hisilicon/hibmc/hibmc_ttm.c
+++ b/drivers/gpu/drm/hisilicon/hibmc/hibmc_ttm.c
@@ -16,6 +16,7 @@
  *
  */
 
+#include <drm/drm_atomic_helper.h>
 #include <ttm/ttm_page_alloc.h>
 
 #include "hibmc_drm_drv.h"
@@ -483,3 +484,69 @@ int hibmc_dumb_mmap_offset(struct drm_file *file, struct drm_device *dev,
 	drm_gem_object_unreference_unlocked(obj);
 	return 0;
 }
+
+static void hibmc_user_framebuffer_destroy(struct drm_framebuffer *fb)
+{
+	struct hibmc_framebuffer *hibmc_fb = to_hibmc_framebuffer(fb);
+
+	drm_gem_object_unreference_unlocked(hibmc_fb->obj);
+	drm_framebuffer_cleanup(fb);
+	kfree(hibmc_fb);
+}
+
+static const struct drm_framebuffer_funcs hibmc_fb_funcs = {
+	.destroy = hibmc_user_framebuffer_destroy,
+};
+
+struct hibmc_framebuffer *
+hibmc_framebuffer_init(struct drm_device *dev,
+		       const struct drm_mode_fb_cmd2 *mode_cmd,
+		       struct drm_gem_object *obj)
+{
+	struct hibmc_framebuffer *hibmc_fb;
+	int ret;
+
+	hibmc_fb = kzalloc(sizeof(*hibmc_fb), GFP_KERNEL);
+	if (!hibmc_fb) {
+		DRM_ERROR("failed to allocate hibmc_fb\n");
+		return ERR_PTR(-ENOMEM);
+	}
+
+	drm_helper_mode_fill_fb_struct(&hibmc_fb->fb, mode_cmd);
+	hibmc_fb->obj = obj;
+	ret = drm_framebuffer_init(dev, &hibmc_fb->fb, &hibmc_fb_funcs);
+	if (ret) {
+		DRM_ERROR("drm_framebuffer_init failed: %d\n", ret);
+		kfree(hibmc_fb);
+		return ERR_PTR(ret);
+	}
+
+	return hibmc_fb;
+}
+
+static struct drm_framebuffer *
+hibmc_user_framebuffer_create(struct drm_device *dev,
+			      struct drm_file *filp,
+			      const struct drm_mode_fb_cmd2 *mode_cmd)
+{
+	struct drm_gem_object *obj;
+	struct hibmc_framebuffer *hibmc_fb;
+
+	DRM_DEBUG_DRIVER("%dx%d, format %c%c%c%c\n",
+			 mode_cmd->width, mode_cmd->height,
+			 (mode_cmd->pixel_format) & 0xff,
+			 (mode_cmd->pixel_format >> 8)  & 0xff,
+			 (mode_cmd->pixel_format >> 16) & 0xff,
+			 (mode_cmd->pixel_format >> 24) & 0xff);
+
+	obj = drm_gem_object_lookup(filp, mode_cmd->handles[0]);
+	if (!obj)
+		return ERR_PTR(-ENOENT);
+
+	hibmc_fb = hibmc_framebuffer_init(dev, mode_cmd, obj);
+	if (IS_ERR(hibmc_fb)) {
+		drm_gem_object_unreference_unlocked(obj);
+		return ERR_PTR((long)hibmc_fb);
+	}
+	return &hibmc_fb->fb;
+}