drm/vkms: Use dma-buf mapping from shadow-plane state for composing

Store the shadow-buffer mapping's address in struct vkms_composer and
use the value when composing the output. It's the same value as stored
in the GEM SHMEM BO, but frees the composer code from its dependency
on GEM SHMEM.

Using struct dma_buf_map is how framebuffer access is supposed to be.
The long-term plan is to perform all framebuffer access via struct
dma_buf_map and avoid the details of accessing I/O and system memory.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Melissa Wen <melissa.srw@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210705074633.9425-5-tzimmermann@suse.de

1 files changed, 11 insertions, 13 deletions

diff --git a/drivers/gpu/drm/vkms/vkms_composer.c b/drivers/gpu/drm/vkms/vkms_composer.c
index 3ade0df173d2..ead8fff81f30 100644
--- a/drivers/gpu/drm/vkms/vkms_composer.c
+++ b/drivers/gpu/drm/vkms/vkms_composer.c
@@ -6,7 +6,6 @@
 #include <drm/drm_atomic_helper.h>
 #include <drm/drm_fourcc.h>
 #include <drm/drm_gem_framebuffer_helper.h>
-#include <drm/drm_gem_shmem_helper.h>
 #include <drm/drm_vblank.h>
 
 #include "vkms_drv.h"
@@ -154,24 +153,21 @@ static void compose_plane(struct vkms_composer *primary_composer,
 			  struct vkms_composer *plane_composer,
 			  void *vaddr_out)
 {
-	struct drm_gem_object *plane_obj;
-	struct drm_gem_shmem_object *plane_shmem_obj;
 	struct drm_framebuffer *fb = &plane_composer->fb;
+	void *vaddr;
 	void (*pixel_blend)(const u8 *p_src, u8 *p_dst);
 
-	plane_obj = drm_gem_fb_get_obj(&plane_composer->fb, 0);
-	plane_shmem_obj = to_drm_gem_shmem_obj(plane_obj);
-
-	if (WARN_ON(!plane_shmem_obj->vaddr))
+	if (WARN_ON(dma_buf_map_is_null(&primary_composer->map[0])))
 		return;
 
+	vaddr = plane_composer->map[0].vaddr;
+
 	if (fb->format->format == DRM_FORMAT_ARGB8888)
 		pixel_blend = &alpha_blend;
 	else
 		pixel_blend = &x_blend;
 
-	blend(vaddr_out, plane_shmem_obj->vaddr, primary_composer,
-	      plane_composer, pixel_blend);
+	blend(vaddr_out, vaddr, primary_composer, plane_composer, pixel_blend);
 }
 
 static int compose_active_planes(void **vaddr_out,
@@ -180,21 +176,23 @@ static int compose_active_planes(void **vaddr_out,
 {
 	struct drm_framebuffer *fb = &primary_composer->fb;
 	struct drm_gem_object *gem_obj = drm_gem_fb_get_obj(fb, 0);
-	struct drm_gem_shmem_object *shmem_obj = to_drm_gem_shmem_obj(gem_obj);
+	const void *vaddr;
 	int i;
 
 	if (!*vaddr_out) {
-		*vaddr_out = kzalloc(shmem_obj->base.size, GFP_KERNEL);
+		*vaddr_out = kzalloc(gem_obj->size, GFP_KERNEL);
 		if (!*vaddr_out) {
 			DRM_ERROR("Cannot allocate memory for output frame.");
 			return -ENOMEM;
 		}
 	}
 
-	if (WARN_ON(!shmem_obj->vaddr))
+	if (WARN_ON(dma_buf_map_is_null(&primary_composer->map[0])))
 		return -EINVAL;
 
-	memcpy(*vaddr_out, shmem_obj->vaddr, shmem_obj->base.size);
+	vaddr = primary_composer->map[0].vaddr;
+
+	memcpy(*vaddr_out, vaddr, gem_obj->size);
 
 	/* If there are other planes besides primary, we consider the active
 	 * planes should be in z-order and compose them associatively: