This patch map/unmap GEM backing memory to kernel address space in prepare/cleanup_fb respectively and cache the virtual address for later use.
Signed-off-by: Haneen Mohammed hamohammed.sa@gmail.com --- drivers/gpu/drm/vkms/vkms_plane.c | 41 +++++++++++++++++++++++++++++++ 1 file changed, 41 insertions(+)
diff --git a/drivers/gpu/drm/vkms/vkms_plane.c b/drivers/gpu/drm/vkms/vkms_plane.c index f7f63143f6d0..f464eb0e05dd 100644 --- a/drivers/gpu/drm/vkms/vkms_plane.c +++ b/drivers/gpu/drm/vkms/vkms_plane.c @@ -9,6 +9,7 @@ #include "vkms_drv.h" #include <drm/drm_plane_helper.h> #include <drm/drm_atomic_helper.h> +#include <drm/drm_gem_framebuffer_helper.h>
static const struct drm_plane_funcs vkms_plane_funcs = { .update_plane = drm_atomic_helper_update_plane, @@ -30,9 +31,49 @@ static void vkms_primary_plane_update(struct drm_plane *plane, { }
+static int vkms_prepare_fb(struct drm_plane *plane, + struct drm_plane_state *state) +{ + struct drm_gem_object *gem_obj; + struct vkms_gem_object *vkms_obj; + + if (!state->fb) + return 0; + + gem_obj = drm_gem_fb_get_obj(state->fb, 0); + vkms_obj = container_of(gem_obj, struct vkms_gem_object, gem); + vkms_obj->vaddr = vkms_gem_vmap(gem_obj); + + if (!vkms_obj->vaddr) + DRM_INFO("vmap failed\n"); + + return drm_gem_fb_prepare_fb(plane, state); +} + +static void vkms_cleanup_fb(struct drm_plane *plane, + struct drm_plane_state *old_state) +{ + struct drm_gem_object *gem_obj; + struct vkms_gem_object *vkms_obj; + + if (!old_state->fb) + return; + + gem_obj = drm_gem_fb_get_obj(old_state->fb, 0); + vkms_obj = container_of(gem_obj, struct vkms_gem_object, gem); + + if (vkms_obj && vkms_obj->pages) { + vunmap(vkms_obj->vaddr); + drm_gem_put_pages(gem_obj, vkms_obj->pages, false, true); + vkms_obj->pages = NULL; + } +} + static const struct drm_plane_helper_funcs vkms_primary_helper_funcs = { .atomic_check = vkms_plane_atomic_check, .atomic_update = vkms_primary_plane_update, + .prepare_fb = vkms_prepare_fb, + .cleanup_fb = vkms_cleanup_fb, };
struct drm_plane *vkms_plane_init(struct vkms_device *vkmsdev)