drm: drop DRM_IOCTL_MODE_REPLACEFB, add+remove works just as well.

The replace fb ioctl replaces the backing buffer object for a modesetting
framebuffer object.  This can be acheived by just creating a new
framebuffer backed by the new buffer object, setting that for the crtcs
in question and then removing the old framebuffer object.
Signed-off-by: Kristian Hogsberg <krh@redhat.com>
Acked-by: Jakob Bornecrantz <jakob@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

drivers/gpu/drm/drm_crtc.c

@@ -2302,46 +2302,6 @@ int drm_mode_connector_property_set_ioctl(struct drm_device *dev,
 	return ret;
 }
 
-
-int drm_mode_replacefb(struct drm_device *dev,
-		       void *data, struct drm_file *file_priv)
-{
-	struct drm_mode_fb_cmd *r = data;
-	struct drm_mode_object *obj;
-	struct drm_framebuffer *fb;
-	int found = 0;
-	struct drm_framebuffer *fbl = NULL;
-	int ret = 0;
-
-	/* right replace the current bo attached to this fb with a new bo */
-	mutex_lock(&dev->mode_config.mutex);
-	obj = drm_mode_object_find(dev, r->fb_id, DRM_MODE_OBJECT_FB);
-	if (!obj) {
-		ret = -EINVAL;
-		goto out;
-	}
-	fb = obj_to_fb(obj);
-
-	list_for_each_entry(fbl, &file_priv->fbs, filp_head)
-		if (fb == fbl)
-			found = 1;
-
-	if (!found) {
-		DRM_ERROR("tried to replace an fb we didn't own\n");
-		ret = -EINVAL;
-		goto out;
-	}
-
-	if (dev->mode_config.funcs->resize_fb)
-		ret = dev->mode_config.funcs->resize_fb(dev, file_priv, fb, r);
-	else
-		ret = -EINVAL;
-out:
-	mutex_unlock(&dev->mode_config.mutex);
-	return ret;
-
-}
-
 int drm_mode_connector_attach_encoder(struct drm_connector *connector,
 				      struct drm_encoder *encoder)
 {

drivers/gpu/drm/drm_drv.c

@@ -143,7 +143,6 @@ static struct drm_ioctl_desc drm_ioctls[] = {
 	DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETFB, drm_mode_getfb, DRM_MASTER|DRM_CONTROL_ALLOW),
 	DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB, drm_mode_addfb, DRM_MASTER|DRM_CONTROL_ALLOW),
 	DRM_IOCTL_DEF(DRM_IOCTL_MODE_RMFB, drm_mode_rmfb, DRM_MASTER|DRM_CONTROL_ALLOW),
-	DRM_IOCTL_DEF(DRM_IOCTL_MODE_REPLACEFB, drm_mode_replacefb, DRM_MASTER|DRM_ROOT_ONLY|DRM_CONTROL_ALLOW),
 };
 
 #define DRM_CORE_IOCTL_COUNT	ARRAY_SIZE( drm_ioctls )

drivers/gpu/drm/i915/intel_display.c

@@ -1528,38 +1528,7 @@ intel_user_framebuffer_create(struct drm_device *dev,
 	return fb;
 }
 
-static int intel_insert_new_fb(struct drm_device *dev,
-			       struct drm_file *file_priv,
-			       struct drm_framebuffer *fb,
-			       struct drm_mode_fb_cmd *mode_cmd)
-{
-	struct intel_framebuffer *intel_fb;
-	struct drm_gem_object *obj;
-	struct drm_crtc *crtc;
-
-	intel_fb = to_intel_framebuffer(fb);
-
-	obj = drm_gem_object_lookup(dev, file_priv, mode_cmd->handle);
-
-	if (!obj)
-		return -EINVAL;
-
-	intel_fb->obj = obj;
-	drm_gem_object_unreference(intel_fb->obj);
-	drm_helper_mode_fill_fb_struct(fb, mode_cmd);
-	mutex_unlock(&dev->struct_mutex);
-
-	list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
-		if (crtc->fb == fb) {
-			struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
-			crtc_funcs->mode_set_base(crtc, crtc->x, crtc->y);
-		}
-	}
-	return 0;
-}
-
 static const struct drm_mode_config_funcs intel_mode_funcs = {
-	.resize_fb = intel_insert_new_fb,
 	.fb_create = intel_user_framebuffer_create,
 	.fb_changed = intelfb_probe,
 };

include/drm/drm.h

@@ -687,7 +687,6 @@ struct drm_gem_open {
 #define DRM_IOCTL_MODE_GETFB		DRM_IOWR(0xAD, struct drm_mode_fb_cmd)
 #define DRM_IOCTL_MODE_ADDFB		DRM_IOWR(0xAE, struct drm_mode_fb_cmd)
 #define DRM_IOCTL_MODE_RMFB		DRM_IOWR(0xAF, unsigned int)
-#define DRM_IOCTL_MODE_REPLACEFB	DRM_IOWR(0xB0, struct drm_mode_fb_cmd)
 
 /**
  * Device specific ioctls should only be in their respective headers

include/drm/drm_crtc.h

@@ -510,7 +510,6 @@ struct drm_mode_set {
  * the CRTC<->connector mappings as needed and update its view of the screen.
  */
 struct drm_mode_config_funcs {
-	int (*resize_fb)(struct drm_device *dev, struct drm_file *file_priv, struct drm_framebuffer *fb, struct drm_mode_fb_cmd *mode_cmd);
 	struct drm_framebuffer *(*fb_create)(struct drm_device *dev, struct drm_file *file_priv, struct drm_mode_fb_cmd *mode_cmd);
 	int (*fb_changed)(struct drm_device *dev);
 };