[PATCH v2] drm/vkms: Add overlay plane support

[Mamta Shukla <mamtashukla555@gmail.com>]

Add overlay plane support in vkms aligned with cursor and primary
plane with module option 'enable_overlay' to enable/disable overlay
plane while testing.

This currently passes plane-position-covered-pipe-A-plane subtest
from IGT kms_plane test.

Signed-off-by: Mamta Shukla <mamtashukla555@gmail.com>
---
change in v2:
-Fix warning: return makes pointer from integer without a cast using
 ERR_PTR

 drivers/gpu/drm/vkms/vkms_crc.c   | 36 +++++++++++++++++++++++++++----
 drivers/gpu/drm/vkms/vkms_drv.c   |  4 ++++
 drivers/gpu/drm/vkms/vkms_drv.h   |  8 +++++++
 drivers/gpu/drm/vkms/vkms_plane.c | 36 ++++++++++++++++++++++++++++++-
 4 files changed, 79 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/vkms/vkms_crc.c b/drivers/gpu/drm/vkms/vkms_crc.c
index 4dd6c155363d..ac3ed863cf34 100644
--- a/drivers/gpu/drm/vkms/vkms_crc.c
+++ b/drivers/gpu/drm/vkms/vkms_crc.c
@@ -109,6 +109,25 @@ static void blend(void *vaddr_dst, void *vaddr_src,
 	}
 }
 
+static void compose_overlay(struct vkms_crc_data *overlay_crc,
+			    struct vkms_crc_data *primary_crc, void *vaddr_out)	{
+	struct drm_gem_object *overlay_obj;
+	struct vkms_gem_object  *overlay_vkms_obj;
+
+	overlay_obj = drm_gem_fb_get_obj(&overlay_crc->fb, 0);
+	overlay_vkms_obj = drm_gem_to_vkms_gem(overlay_obj);
+	mutex_lock(&overlay_vkms_obj->pages_lock);
+	if(!overlay_vkms_obj->vaddr){
+		DRM_WARN("overlay palne vaddr is NULL");
+		goto out;
+	}
+
+	blend(vaddr_out, overlay_vkms_obj->vaddr, primary_crc, overlay_crc);
+
+out:
+	mutex_unlock(&overlay_vkms_obj->pages_lock);
+}
+
 static void compose_cursor(struct vkms_crc_data *cursor_crc,
 			   struct vkms_crc_data *primary_crc, void *vaddr_out)
 {
@@ -131,7 +150,8 @@ static void compose_cursor(struct vkms_crc_data *cursor_crc,
 }
 
 static uint32_t _vkms_get_crc(struct vkms_crc_data *primary_crc,
-			      struct vkms_crc_data *cursor_crc)
+			      struct vkms_crc_data *cursor_crc,
+			      struct vkms_crc_data *overlay_crc)
 {
 	struct drm_framebuffer *fb = &primary_crc->fb;
 	struct drm_gem_object *gem_obj = drm_gem_fb_get_obj(fb, 0);
@@ -154,6 +174,8 @@ static uint32_t _vkms_get_crc(struct vkms_crc_data *primary_crc,
 	memcpy(vaddr_out, vkms_obj->vaddr, vkms_obj->gem.size);
 	mutex_unlock(&vkms_obj->pages_lock);
 
+	if (overlay_crc)
+		compose_overlay(overlay_crc, primary_crc, vaddr_out);
 	if (cursor_crc)
 		compose_cursor(cursor_crc, primary_crc, vaddr_out);
 
@@ -184,6 +206,7 @@ void vkms_crc_work_handle(struct work_struct *work)
 						output);
 	struct vkms_crc_data *primary_crc = NULL;
 	struct vkms_crc_data *cursor_crc = NULL;
+	struct vkms_crc_data *overlay_crc = NULL;
 	struct drm_plane *plane;
 	u32 crc32 = 0;
 	u64 frame_start, frame_end;
@@ -210,12 +233,17 @@ void vkms_crc_work_handle(struct work_struct *work)
 
 		if (plane->type == DRM_PLANE_TYPE_PRIMARY)
 			primary_crc = crc_data;
-		else
+
+		if (plane->type == DRM_PLANE_TYPE_CURSOR)
 			cursor_crc = crc_data;
+
+		if (plane->type == DRM_PLANE_TYPE_OVERLAY)
+			overlay_crc = crc_data;
 	}
 
-	if (primary_crc)
-		crc32 = _vkms_get_crc(primary_crc, cursor_crc);
+	if (primary_crc){
+		crc32 = _vkms_get_crc(primary_crc, cursor_crc, overlay_crc);
+	}
 
 	frame_end = drm_crtc_accurate_vblank_count(crtc);
 
diff --git a/drivers/gpu/drm/vkms/vkms_drv.c b/drivers/gpu/drm/vkms/vkms_drv.c
index 738dd6206d85..b08ad6f95675 100644
--- a/drivers/gpu/drm/vkms/vkms_drv.c
+++ b/drivers/gpu/drm/vkms/vkms_drv.c
@@ -29,6 +29,10 @@ bool enable_cursor;
 module_param_named(enable_cursor, enable_cursor, bool, 0444);
 MODULE_PARM_DESC(enable_cursor, "Enable/Disable cursor support");
 
+bool enable_overlay;
+module_param_named(enable_overlay, enable_overlay, bool, 0444);
+MODULE_PARM_DESC(enable_overlay, "Enable/Disable overlay support");
+
 static const struct file_operations vkms_driver_fops = {
 	.owner		= THIS_MODULE,
 	.open		= drm_open,
diff --git a/drivers/gpu/drm/vkms/vkms_drv.h b/drivers/gpu/drm/vkms/vkms_drv.h
index 81f1cfbeb936..81dceadfde62 100644
--- a/drivers/gpu/drm/vkms/vkms_drv.h
+++ b/drivers/gpu/drm/vkms/vkms_drv.h
@@ -20,6 +20,8 @@
 
 extern bool enable_cursor;
 
+extern bool enable_overlay;
+
 static const u32 vkms_formats[] = {
 	DRM_FORMAT_XRGB8888,
 };
@@ -28,6 +30,10 @@ static const u32 vkms_cursor_formats[] = {
 	DRM_FORMAT_ARGB8888,
 };
 
+static const u32 vkms_overlay_formats[] ={
+	DRM_FORMAT_ARGB8888,
+};
+
 struct vkms_crc_data {
 	struct drm_framebuffer fb;
 	struct drm_rect src, dst;
@@ -118,6 +124,8 @@ int vkms_output_init(struct vkms_device *vkmsdev);
 struct drm_plane *vkms_plane_init(struct vkms_device *vkmsdev,
 				  enum drm_plane_type type);
 
+struct drm_plane *vkms_overlay_init(struct vkms_device *vkmsdev);
+
 /* Gem stuff */
 struct drm_gem_object *vkms_gem_create(struct drm_device *dev,
 				       struct drm_file *file,
diff --git a/drivers/gpu/drm/vkms/vkms_plane.c b/drivers/gpu/drm/vkms/vkms_plane.c
index 0e67d2d42f0c..d540b9500633 100644
--- a/drivers/gpu/drm/vkms/vkms_plane.c
+++ b/drivers/gpu/drm/vkms/vkms_plane.c
@@ -114,7 +114,7 @@ static int vkms_plane_atomic_check(struct drm_plane *plane,
 	if (IS_ERR(crtc_state))
 		return PTR_ERR(crtc_state);
 
-	if (plane->type == DRM_PLANE_TYPE_CURSOR)
+	if ((plane->type == DRM_PLANE_TYPE_CURSOR)|(plane->type == DRM_PLANE_TYPE_OVERLAY))
 		can_position = true;
 
 	ret = drm_atomic_helper_check_plane_state(state, crtc_state,
@@ -167,6 +167,40 @@ static const struct drm_plane_helper_funcs vkms_primary_helper_funcs = {
 	.cleanup_fb		= vkms_cleanup_fb,
 };
 
+struct drm_plane *vkms_overlay_init(struct vkms_device *vkmsdev)
+{
+	struct drm_device *dev = &vkmsdev->drm;
+	const struct drm_plane_helper_funcs *funcs;
+	struct drm_plane *overlay;
+	const u32 *formats;
+	int ret, nformats;
+	unsigned int blend_caps  = BIT(DRM_MODE_BLEND_PIXEL_NONE) |
+				BIT(DRM_MODE_BLEND_PREMULTI);
+
+	overlay = kzalloc(sizeof(*overlay), GFP_KERNEL);
+	if (!overlay)
+		return ERR_PTR(-ENOMEM);
+
+	formats = vkms_overlay_formats;
+	nformats = ARRAY_SIZE(vkms_overlay_formats);
+	funcs = &vkms_primary_helper_funcs;
+	drm_plane_helper_add(overlay, funcs);
+	drm_plane_create_alpha_property(overlay);
+	drm_plane_create_blend_mode_property(overlay, blend_caps);
+
+	ret = drm_universal_plane_init(dev, overlay, 0,
+					&vkms_plane_funcs,
+					formats, nformats,
+					NULL,
+					DRM_PLANE_TYPE_OVERLAY, NULL);
+	if (ret){
+		kfree(overlay);
+		return ERR_PTR(ret);
+	}
+
+	return overlay;
+}
+
 struct drm_plane *vkms_plane_init(struct vkms_device *vkmsdev,
 				  enum drm_plane_type type)
 {
-- 
2.17.1

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