drm/vmwgfx: Fix black screen and device errors when running without fbdev

When we are running without fbdev, transitioning from the login screen to
X or gnome-shell/wayland will cause a vt switch and the driver will disable
svga mode, losing all modesetting resources. However, the kms atomic state
does not reflect that and may think that a crtc is still turned on, which
will cause device errors when we try to bind an fb to the crtc, and the
screen will remain black.

Fix this by turning off all kms resources before disabling svga mode.

Cc: <stable@vger.kernel.org>
Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Reviewed-by: Sinclair Yeh <syeh@vmware.com>

drivers/gpu/drm/vmwgfx/vmwgfx_drv.c

@@ -1337,6 +1337,19 @@ static void __vmw_svga_disable(struct vmw_private *dev_priv)
  */
 void vmw_svga_disable(struct vmw_private *dev_priv)
 {
+	/*
+	 * Disabling SVGA will turn off device modesetting capabilities, so
+	 * notify KMS about that so that it doesn't cache atomic state that
+	 * isn't valid anymore, for example crtcs turned on.
+	 * Strictly we'd want to do this under the SVGA lock (or an SVGA mutex),
+	 * but vmw_kms_lost_device() takes the reservation sem and thus we'll
+	 * end up with lock order reversal. Thus, a master may actually perform
+	 * a new modeset just after we call vmw_kms_lost_device() and race with
+	 * vmw_svga_disable(), but that should at worst cause atomic KMS state
+	 * to be inconsistent with the device, causing modesetting problems.
+	 *
+	 */
+	vmw_kms_lost_device(dev_priv->dev);
 	ttm_write_lock(&dev_priv->reservation_sem, false);
 	spin_lock(&dev_priv->svga_lock);
 	if (dev_priv->bdev.man[TTM_PL_VRAM].use_type) {

drivers/gpu/drm/vmwgfx/vmwgfx_drv.h

@@ -938,6 +938,7 @@ int vmw_kms_present(struct vmw_private *dev_priv,
 int vmw_kms_update_layout_ioctl(struct drm_device *dev, void *data,
 				struct drm_file *file_priv);
 void vmw_kms_legacy_hotspot_clear(struct vmw_private *dev_priv);
+void vmw_kms_lost_device(struct drm_device *dev);
 
 int vmw_dumb_create(struct drm_file *file_priv,
 		    struct drm_device *dev,

drivers/gpu/drm/vmwgfx/vmwgfx_kms.c

@@ -2851,3 +2851,14 @@ int vmw_kms_set_config(struct drm_mode_set *set,
 
 	return drm_atomic_helper_set_config(set, ctx);
 }
+
+
+/**
+ * vmw_kms_lost_device - Notify kms that modesetting capabilities will be lost
+ *
+ * @dev: Pointer to the drm device
+ */
+void vmw_kms_lost_device(struct drm_device *dev)
+{
+	drm_atomic_helper_shutdown(dev);
+}

drivers/gpu/drm/vmwgfx/vmwgfx_kms.h

@@ -439,5 +439,4 @@ int vmw_kms_stdu_dma(struct vmw_private *dev_priv,
 
 int vmw_kms_set_config(struct drm_mode_set *set,
 		       struct drm_modeset_acquire_ctx *ctx);
-
 #endif