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 <[e-mail]>
Reviewed-by: Melissa Wen <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/gpu/drm/vkms/vkms_composer.c

···
 #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"
···
 			  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,
···
 {
 	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:

drivers/gpu/drm/vkms/vkms_drv.h

···
 struct vkms_composer {
 	struct drm_framebuffer fb;
 	struct drm_rect src, dst;
+	struct dma_buf_map map[4];
 	unsigned int offset;
 	unsigned int pitch;
 	unsigned int cpp;

drivers/gpu/drm/vkms/vkms_plane.c

···
 	struct drm_plane_state *new_state = drm_atomic_get_new_plane_state(state,
 									   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;
 
···
 		return;
 
 	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->map, sizeof(composer->map));
 	drm_framebuffer_get(&composer->fb);
 	composer->offset = fb->offsets[0];
 	composer->pitch = fb->pitches[0];