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...@gmail.com>
---
Changes in v2:
- use vkms_gem_vunmap
Changes in v3:
- return error number instead of vkms_obj->vaddr
Changes in v4:
- print return value from vkms_gem_vmap
drivers/gpu/drm/vkms/vkms_plane.c | 34 +++++++++++++++++++++++++++++++
1 file changed, 34 insertions(+)
diff --git a/drivers/gpu/drm/vkms/vkms_plane.c
b/drivers/gpu/drm/vkms/vkms_plane.c
index 9f75b1e2c1c4..5611e7cf5fc9 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,
@@ -24,8 +25,41 @@ 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;
+ int ret;
+
+ if (!state->fb)
+ return 0;
+
+ gem_obj = drm_gem_fb_get_obj(state->fb, 0);
+ vkms_obj = drm_gem_to_vkms_gem(gem_obj);
+ ret = vkms_gem_vmap(gem_obj);
+ if (ret)
+ DRM_ERROR("vmap failed: %d\n", ret);
+
+ 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;
+
+ if (!old_state->fb)
+ return;
+
+ gem_obj = drm_gem_fb_get_obj(old_state->fb, 0);
+ vkms_gem_vunmap(gem_obj);
+}
+
static const struct drm_plane_helper_funcs vkms_primary_helper_funcs = {
.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)
--
2.17.1
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