drm: vkms: Rename `vkms_composer` to `vkms_frame_info`

Changes the name of this struct to a more meaningful name.
A name that represents better what this struct is about.

Composer is the code that do the compositing of the planes.
This struct contains information on the frame used in the output
composition. Thus, vkms_frame_info is a better name to represent
this.

V5: Fix a commit message typo(Melissa Wen).
V6: Fix wrong iosys_map_is_null verification at compose_plane
    (Melissa Wen).

Reviewed-by: Melissa Wen <mwen@igalia.com>
Signed-off-by: Igor Torrente <igormtorrente@gmail.com>
Signed-off-by: Melissa Wen <melissa.srw@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220905190811.25024-3-igormtorrente@gmail.com

3 files changed, 66 insertions, 65 deletions

diff --git a/drivers/gpu/drm/vkms/vkms_composer.c b/drivers/gpu/drm/vkms/vkms_composer.c
index 775b97766e08..7c62c5741430 100644
--- a/drivers/gpu/drm/vkms/vkms_composer.c
+++ b/drivers/gpu/drm/vkms/vkms_composer.c
@@ -11,11 +11,11 @@
 #include "vkms_drv.h"
 
 static u32 get_pixel_from_buffer(int x, int y, const u8 *buffer,
-				 const struct vkms_composer *composer)
+				 const struct vkms_frame_info *frame_info)
 {
 	u32 pixel;
-	int src_offset = composer->offset + (y * composer->pitch)
-				      + (x * composer->cpp);
+	int src_offset = frame_info->offset + (y * frame_info->pitch)
+					    + (x * frame_info->cpp);
 
 	pixel = *(u32 *)&buffer[src_offset];
 
@@ -26,24 +26,24 @@ static u32 get_pixel_from_buffer(int x, int y, const u8 *buffer,
  * compute_crc - Compute CRC value on output frame
  *
  * @vaddr: address to final framebuffer
- * @composer: framebuffer's metadata
+ * @frame_info: framebuffer's metadata
  *
  * returns CRC value computed using crc32 on the visible portion of
  * the final framebuffer at vaddr_out
  */
 static uint32_t compute_crc(const u8 *vaddr,
-			    const struct vkms_composer *composer)
+			    const struct vkms_frame_info *frame_info)
 {
 	int x, y;
 	u32 crc = 0, pixel = 0;
-	int x_src = composer->src.x1 >> 16;
-	int y_src = composer->src.y1 >> 16;
-	int h_src = drm_rect_height(&composer->src) >> 16;
-	int w_src = drm_rect_width(&composer->src) >> 16;
+	int x_src = frame_info->src.x1 >> 16;
+	int y_src = frame_info->src.y1 >> 16;
+	int h_src = drm_rect_height(&frame_info->src) >> 16;
+	int w_src = drm_rect_width(&frame_info->src) >> 16;
 
 	for (y = y_src; y < y_src + h_src; ++y) {
 		for (x = x_src; x < x_src + w_src; ++x) {
-			pixel = get_pixel_from_buffer(x, y, vaddr, composer);
+			pixel = get_pixel_from_buffer(x, y, vaddr, frame_info);
 			crc = crc32_le(crc, (void *)&pixel, sizeof(u32));
 		}
 	}
@@ -98,8 +98,8 @@ static void x_blend(const u8 *xrgb_src, u8 *xrgb_dst)
  * blend - blend value at vaddr_src with value at vaddr_dst
  * @vaddr_dst: destination address
  * @vaddr_src: source address
- * @dst_composer: destination framebuffer's metadata
- * @src_composer: source framebuffer's metadata
+ * @dst_frame_info: destination framebuffer's metadata
+ * @src_frame_info: source framebuffer's metadata
  * @pixel_blend: blending equation based on plane format
  *
  * Blend the vaddr_src value with the vaddr_dst value using a pixel blend
@@ -111,33 +111,33 @@ static void x_blend(const u8 *xrgb_src, u8 *xrgb_dst)
  * pixel color values
  */
 static void blend(void *vaddr_dst, void *vaddr_src,
-		  struct vkms_composer *dst_composer,
-		  struct vkms_composer *src_composer,
+		  struct vkms_frame_info *dst_frame_info,
+		  struct vkms_frame_info *src_frame_info,
 		  void (*pixel_blend)(const u8 *, u8 *))
 {
 	int i, j, j_dst, i_dst;
 	int offset_src, offset_dst;
 	u8 *pixel_dst, *pixel_src;
 
-	int x_src = src_composer->src.x1 >> 16;
-	int y_src = src_composer->src.y1 >> 16;
+	int x_src = src_frame_info->src.x1 >> 16;
+	int y_src = src_frame_info->src.y1 >> 16;
 
-	int x_dst = src_composer->dst.x1;
-	int y_dst = src_composer->dst.y1;
-	int h_dst = drm_rect_height(&src_composer->dst);
-	int w_dst = drm_rect_width(&src_composer->dst);
+	int x_dst = src_frame_info->dst.x1;
+	int y_dst = src_frame_info->dst.y1;
+	int h_dst = drm_rect_height(&src_frame_info->dst);
+	int w_dst = drm_rect_width(&src_frame_info->dst);
 
 	int y_limit = y_src + h_dst;
 	int x_limit = x_src + w_dst;
 
 	for (i = y_src, i_dst = y_dst; i < y_limit; ++i) {
 		for (j = x_src, j_dst = x_dst; j < x_limit; ++j) {
-			offset_dst = dst_composer->offset
-				     + (i_dst * dst_composer->pitch)
-				     + (j_dst++ * dst_composer->cpp);
-			offset_src = src_composer->offset
-				     + (i * src_composer->pitch)
-				     + (j * src_composer->cpp);
+			offset_dst = dst_frame_info->offset
+				     + (i_dst * dst_frame_info->pitch)
+				     + (j_dst++ * dst_frame_info->cpp);
+			offset_src = src_frame_info->offset
+				     + (i * src_frame_info->pitch)
+				     + (j * src_frame_info->cpp);
 
 			pixel_src = (u8 *)(vaddr_src + offset_src);
 			pixel_dst = (u8 *)(vaddr_dst + offset_dst);
@@ -149,32 +149,33 @@ static void blend(void *vaddr_dst, void *vaddr_src,
 	}
 }
 
-static void compose_plane(struct vkms_composer *primary_composer,
-			  struct vkms_composer *plane_composer,
+static void compose_plane(struct vkms_frame_info *primary_plane_info,
+			  struct vkms_frame_info *plane_frame_info,
 			  void *vaddr_out)
 {
-	struct drm_framebuffer *fb = &plane_composer->fb;
+	struct drm_framebuffer *fb = &plane_frame_info->fb;
 	void *vaddr;
 	void (*pixel_blend)(const u8 *p_src, u8 *p_dst);
 
-	if (WARN_ON(iosys_map_is_null(&plane_composer->map[0])))
+	if (WARN_ON(iosys_map_is_null(&plane_frame_info->map[0])))
 		return;
 
-	vaddr = plane_composer->map[0].vaddr;
+	vaddr = plane_frame_info->map[0].vaddr;
 
 	if (fb->format->format == DRM_FORMAT_ARGB8888)
 		pixel_blend = &alpha_blend;
 	else
 		pixel_blend = &x_blend;
 
-	blend(vaddr_out, vaddr, primary_composer, plane_composer, pixel_blend);
+	blend(vaddr_out, vaddr, primary_plane_info,
+	      plane_frame_info, pixel_blend);
 }
 
 static int compose_active_planes(void **vaddr_out,
-				 struct vkms_composer *primary_composer,
+				 struct vkms_frame_info *primary_plane_info,
 				 struct vkms_crtc_state *crtc_state)
 {
-	struct drm_framebuffer *fb = &primary_composer->fb;
+	struct drm_framebuffer *fb = &primary_plane_info->fb;
 	struct drm_gem_object *gem_obj = drm_gem_fb_get_obj(fb, 0);
 	const void *vaddr;
 	int i;
@@ -187,10 +188,10 @@ static int compose_active_planes(void **vaddr_out,
 		}
 	}
 
-	if (WARN_ON(iosys_map_is_null(&primary_composer->map[0])))
+	if (WARN_ON(iosys_map_is_null(&primary_plane_info->map[0])))
 		return -EINVAL;
 
-	vaddr = primary_composer->map[0].vaddr;
+	vaddr = primary_plane_info->map[0].vaddr;
 
 	memcpy(*vaddr_out, vaddr, gem_obj->size);
 
@@ -199,8 +200,8 @@ static int compose_active_planes(void **vaddr_out,
 	 * ((primary <- overlay) <- cursor)
 	 */
 	for (i = 1; i < crtc_state->num_active_planes; i++)
-		compose_plane(primary_composer,
-			      crtc_state->active_planes[i]->composer,
+		compose_plane(primary_plane_info,
+			      crtc_state->active_planes[i]->frame_info,
 			      *vaddr_out);
 
 	return 0;
@@ -222,7 +223,7 @@ void vkms_composer_worker(struct work_struct *work)
 						composer_work);
 	struct drm_crtc *crtc = crtc_state->base.crtc;
 	struct vkms_output *out = drm_crtc_to_vkms_output(crtc);
-	struct vkms_composer *primary_composer = NULL;
+	struct vkms_frame_info *primary_plane_info = NULL;
 	struct vkms_plane_state *act_plane = NULL;
 	bool crc_pending, wb_pending;
 	void *vaddr_out = NULL;
@@ -250,16 +251,16 @@ void vkms_composer_worker(struct work_struct *work)
 	if (crtc_state->num_active_planes >= 1) {
 		act_plane = crtc_state->active_planes[0];
 		if (act_plane->base.base.plane->type == DRM_PLANE_TYPE_PRIMARY)
-			primary_composer = act_plane->composer;
+			primary_plane_info = act_plane->frame_info;
 	}
 
-	if (!primary_composer)
+	if (!primary_plane_info)
 		return;
 
 	if (wb_pending)
 		vaddr_out = crtc_state->active_writeback->data[0].vaddr;
 
-	ret = compose_active_planes(&vaddr_out, primary_composer,
+	ret = compose_active_planes(&vaddr_out, primary_plane_info,
 				    crtc_state);
 	if (ret) {
 		if (ret == -EINVAL && !wb_pending)
@@ -267,7 +268,7 @@ void vkms_composer_worker(struct work_struct *work)
 		return;
 	}
 
-	crc32 = compute_crc(vaddr_out, primary_composer);
+	crc32 = compute_crc(vaddr_out, primary_plane_info);
 
 	if (wb_pending) {
 		drm_writeback_signal_completion(&out->wb_connector, 0);
diff --git a/drivers/gpu/drm/vkms/vkms_drv.h b/drivers/gpu/drm/vkms/vkms_drv.h
index ae6c5a3d356c..cde7d9ac70ad 100644
--- a/drivers/gpu/drm/vkms/vkms_drv.h
+++ b/drivers/gpu/drm/vkms/vkms_drv.h
@@ -28,7 +28,7 @@ struct vkms_writeback_job {
 	struct iosys_map data[DRM_FORMAT_MAX_PLANES];
 };
 
-struct vkms_composer {
+struct vkms_frame_info {
 	struct drm_framebuffer fb;
 	struct drm_rect src, dst;
 	struct iosys_map map[DRM_FORMAT_MAX_PLANES];
@@ -40,11 +40,11 @@ struct vkms_composer {
 /**
  * vkms_plane_state - Driver specific plane state
  * @base: base plane state
- * @composer: data required for composing computation
+ * @frame_info: data required for composing computation
  */
 struct vkms_plane_state {
 	struct drm_shadow_plane_state base;
-	struct vkms_composer *composer;
+	struct vkms_frame_info *frame_info;
 };
 
 struct vkms_plane {
diff --git a/drivers/gpu/drm/vkms/vkms_plane.c b/drivers/gpu/drm/vkms/vkms_plane.c
index 8a810bfa1264..52ec5a691002 100644
--- a/drivers/gpu/drm/vkms/vkms_plane.c
+++ b/drivers/gpu/drm/vkms/vkms_plane.c
@@ -23,20 +23,20 @@ static struct drm_plane_state *
 vkms_plane_duplicate_state(struct drm_plane *plane)
 {
 	struct vkms_plane_state *vkms_state;
-	struct vkms_composer *composer;
+	struct vkms_frame_info *frame_info;
 
 	vkms_state = kzalloc(sizeof(*vkms_state), GFP_KERNEL);
 	if (!vkms_state)
 		return NULL;
 
-	composer = kzalloc(sizeof(*composer), GFP_KERNEL);
-	if (!composer) {
-		DRM_DEBUG_KMS("Couldn't allocate composer\n");
+	frame_info = kzalloc(sizeof(*frame_info), GFP_KERNEL);
+	if (!frame_info) {
+		DRM_DEBUG_KMS("Couldn't allocate frame_info\n");
 		kfree(vkms_state);
 		return NULL;
 	}
 
-	vkms_state->composer = composer;
+	vkms_state->frame_info = frame_info;
 
 	__drm_gem_duplicate_shadow_plane_state(plane, &vkms_state->base);
 
@@ -53,12 +53,12 @@ static void vkms_plane_destroy_state(struct drm_plane *plane,
 		/* dropping the reference we acquired in
 		 * vkms_primary_plane_update()
 		 */
-		if (drm_framebuffer_read_refcount(&vkms_state->composer->fb))
-			drm_framebuffer_put(&vkms_state->composer->fb);
+		if (drm_framebuffer_read_refcount(&vkms_state->frame_info->fb))
+			drm_framebuffer_put(&vkms_state->frame_info->fb);
 	}
 
-	kfree(vkms_state->composer);
-	vkms_state->composer = NULL;
+	kfree(vkms_state->frame_info);
+	vkms_state->frame_info = NULL;
 
 	__drm_gem_destroy_shadow_plane_state(&vkms_state->base);
 	kfree(vkms_state);
@@ -98,7 +98,7 @@ static void vkms_plane_atomic_update(struct drm_plane *plane,
 	struct vkms_plane_state *vkms_plane_state;
 	struct drm_shadow_plane_state *shadow_plane_state;
 	struct drm_framebuffer *fb = new_state->fb;
-	struct vkms_composer *composer;
+	struct vkms_frame_info *frame_info;
 
 	if (!new_state->crtc || !fb)
 		return;
@@ -106,15 +106,15 @@ static void vkms_plane_atomic_update(struct drm_plane *plane,
 	vkms_plane_state = to_vkms_plane_state(new_state);
 	shadow_plane_state = &vkms_plane_state->base;
 
-	composer = vkms_plane_state->composer;
-	memcpy(&composer->src, &new_state->src, sizeof(struct drm_rect));
-	memcpy(&composer->dst, &new_state->dst, sizeof(struct drm_rect));
-	memcpy(&composer->fb, fb, sizeof(struct drm_framebuffer));
-	memcpy(&composer->map, &shadow_plane_state->data, sizeof(composer->map));
-	drm_framebuffer_get(&composer->fb);
-	composer->offset = fb->offsets[0];
-	composer->pitch = fb->pitches[0];
-	composer->cpp = fb->format->cpp[0];
+	frame_info = vkms_plane_state->frame_info;
+	memcpy(&frame_info->src, &new_state->src, sizeof(struct drm_rect));
+	memcpy(&frame_info->dst, &new_state->dst, sizeof(struct drm_rect));
+	memcpy(&frame_info->fb, fb, sizeof(struct drm_framebuffer));
+	memcpy(&frame_info->map, &shadow_plane_state->data, sizeof(frame_info->map));
+	drm_framebuffer_get(&frame_info->fb);
+	frame_info->offset = fb->offsets[0];
+	frame_info->pitch = fb->pitches[0];
+	frame_info->cpp = fb->format->cpp[0];
 }
 
 static int vkms_plane_atomic_check(struct drm_plane *plane,