vmwgfx: Add page flip support

Signed-off-by: Jakob Bornecrantz <jakob@vmware.com>
Reviewed-by: Thomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

3 files changed, 106 insertions, 0 deletions

diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c b/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
index 24efcae3e2f5..2286d47e5022 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
@@ -1681,6 +1681,70 @@ int vmw_du_update_layout(struct vmw_private *dev_priv, unsigned num,
         return 0;
 }
 
+int vmw_du_page_flip(struct drm_crtc *crtc,
+                     struct drm_framebuffer *fb,
+                     struct drm_pending_vblank_event *event)
+{
+        struct vmw_private *dev_priv = vmw_priv(crtc->dev);
+        struct drm_framebuffer *old_fb = crtc->fb;
+        struct vmw_framebuffer *vfb = vmw_framebuffer_to_vfb(fb);
+        struct drm_file *file_priv = event->base.file_priv;
+        struct vmw_fence_obj *fence = NULL;
+        struct drm_clip_rect clips;
+        int ret;
+
+        /* require ScreenObject support for page flipping */
+        if (!dev_priv->sou_priv)
+                return -ENOSYS;
+
+        if (!vmw_kms_screen_object_flippable(dev_priv, crtc))
+                return -EINVAL;
+
+        crtc->fb = fb;
+
+        /* do a full screen dirty update */
+        clips.x1 = clips.y1 = 0;
+        clips.x2 = fb->width;
+        clips.y2 = fb->height;
+
+        if (vfb->dmabuf)
+                ret = do_dmabuf_dirty_sou(file_priv, dev_priv, vfb,
+                                          0, 0, &clips, 1, 1, &fence);
+        else
+                ret = do_surface_dirty_sou(dev_priv, file_priv, vfb,
+                                           0, 0, &clips, 1, 1, &fence);
+
+
+        if (ret != 0)
+                goto out_no_fence;
+        if (!fence) {
+                ret = -EINVAL;
+                goto out_no_fence;
+        }
+
+        ret = vmw_event_fence_action_queue(file_priv, fence,
+                                           &event->base,
+                                           &event->event.tv_sec,
+                                           &event->event.tv_usec,
+                                           true);
+
+        /*
+         * No need to hold on to this now. The only cleanup
+         * we need to do if we fail is unref the fence.
+         */
+        vmw_fence_obj_unreference(&fence);
+
+        if (vmw_crtc_to_du(crtc)->is_implicit)
+                vmw_kms_screen_object_update_implicit_fb(dev_priv, crtc);
+
+        return ret;
+
+out_no_fence:
+        crtc->fb = old_fb;
+        return ret;
+}
+
+
 void vmw_du_crtc_save(struct drm_crtc *crtc)
 {
 }
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_kms.h b/drivers/gpu/drm/vmwgfx/vmwgfx_kms.h
index a4f7f034996a..8184bc5b1730 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_kms.h
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_kms.h
@@ -121,6 +121,9 @@ struct vmw_display_unit {
  * Shared display unit functions - vmwgfx_kms.c
  */
 void vmw_display_unit_cleanup(struct vmw_display_unit *du);
+int vmw_du_page_flip(struct drm_crtc *crtc,
+                     struct drm_framebuffer *fb,
+                     struct drm_pending_vblank_event *event);
 void vmw_du_crtc_save(struct drm_crtc *crtc);
 void vmw_du_crtc_restore(struct drm_crtc *crtc);
 void vmw_du_crtc_gamma_set(struct drm_crtc *crtc,
@@ -154,5 +157,10 @@ int vmw_kms_init_screen_object_display(struct vmw_private *dev_priv);
 int vmw_kms_close_screen_object_display(struct vmw_private *dev_priv);
 int vmw_kms_sou_update_layout(struct vmw_private *dev_priv, unsigned num,
                               struct drm_vmw_rect *rects);
+bool vmw_kms_screen_object_flippable(struct vmw_private *dev_priv,
+                                     struct drm_crtc *crtc);
+void vmw_kms_screen_object_update_implicit_fb(struct vmw_private *dev_priv,
+                                              struct drm_crtc *crtc);
+
 
 #endif
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_scrn.c b/drivers/gpu/drm/vmwgfx/vmwgfx_scrn.c
index 4defdcf1c72e..97aca0bf94d0 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_scrn.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_scrn.c
@@ -394,6 +394,7 @@ static struct drm_crtc_funcs vmw_screen_object_crtc_funcs = {
         .gamma_set = vmw_du_crtc_gamma_set,
         .destroy = vmw_sou_crtc_destroy,
         .set_config = vmw_sou_crtc_set_config,
+        .page_flip = vmw_du_page_flip,
 };
 
 /*
@@ -535,3 +536,36 @@ int vmw_kms_close_screen_object_display(struct vmw_private *dev_priv)
 
         return 0;
 }
+
+/**
+ * Returns if this unit can be page flipped.
+ * Must be called with the mode_config mutex held.
+ */
+bool vmw_kms_screen_object_flippable(struct vmw_private *dev_priv,
+                                     struct drm_crtc *crtc)
+{
+        struct vmw_screen_object_unit *sou = vmw_crtc_to_sou(crtc);
+
+        if (!sou->base.is_implicit)
+                return true;
+
+        if (dev_priv->sou_priv->num_implicit != 1)
+                return false;
+
+        return true;
+}
+
+/**
+ * Update the implicit fb to the current fb of this crtc.
+ * Must be called with the mode_config mutex held.
+ */
+void vmw_kms_screen_object_update_implicit_fb(struct vmw_private *dev_priv,
+                                              struct drm_crtc *crtc)
+{
+        struct vmw_screen_object_unit *sou = vmw_crtc_to_sou(crtc);
+
+        BUG_ON(!sou->base.is_implicit);
+
+        dev_priv->sou_priv->implicit_fb =
+                vmw_framebuffer_to_vfb(sou->base.crtc.fb);
+}