bugfixes for qemu (bochs, qxl and virtio-gpu) drm drivers

-----BEGIN PGP SIGNATURE-----
 Version: GnuPG v2.0.22 (GNU/Linux)
 
 iQIcBAABAgAGBQJX4lTNAAoJEEy22O7T6HE4aT4P/iWFkmG/Wg5WqANDrfZw6tPb
 sy7Nhl9w5L9tyMQY2Mvan3zaBEnpy/QVHCNn3iFBx68TeP6jO4eA5X4xtTGlFVV0
 +K2vjPj7pYZKo4InwvTAnL9G5FpfPMtFydLsjuZOLwrfeAIDj3MMTpkvKiOAPkAg
 gNSmNGkt+rxo0gFVHyev1/TXjV5J2fXhv+NZiqdegEkdSFi7A63TO9pN0d/VDcCh
 c6ZoVy1OFKfTD/2kvtBqgeFghXThjkJv+38uRzZwq5yGerq/4L8FU5tD6WTAowzo
 MayJdGIKaSqEDMzIVVMkeCDcDGXrZNAJhwfw5LDsNU2M50LL2oRxil3t7PxLeG8l
 9KOp3jR1L8LGpqyTZQBKrrWhFwF4iZ1f6U7Q3N2MSH8oGc7orqvklis23jhNNkk/
 /oNBckGrX3Hof7mMgaug1RDjEfhXD82awhvEoQS7ep+jYhJnnfqvbx/GvTBc5i3t
 cXu1jNvh1tBKbdbEoFOBrNDla05IL5qD3LaPaH0w4un6YjUhEYdQliDz20e6N5uz
 R2f5BmqcHKkQHH108dOAUNgF9LiHqlZQPVyOYds8ACQTm874COPbgpyFohAl96Ri
 /swEXv8mijluOMp5ZCXaClNvsv18iW/eCNw2ohT8qWbPj4TTuJUy8Rx4RIFBEBMo
 /LoiT6Sf9UFljafQYt50
 =lhHU
 -----END PGP SIGNATURE-----

Merge tag 'drm-qemu-20160921' of git://git.kraxel.org/linux into drm-next

bugfixes for qemu (bochs, qxl and virtio-gpu) drm drivers

* tag 'drm-qemu-20160921' of git://git.kraxel.org/linux:
  drm/virtio: add real fence context and seqno
  drm/virtio: drop virtio_gpu_execbuffer_ioctl() wrapping
  virtio-gpu: avoid possible NULL pointer dereference
  drm/qxl: reapply cursor after SetCrtc calls
  bochs: ignore device if there isn't enougth memory

drivers/gpu/drm/bochs/bochs_drv.c

@@ -163,8 +163,15 @@ static int bochs_kick_out_firmware_fb(struct pci_dev *pdev)
 static int bochs_pci_probe(struct pci_dev *pdev,
 			   const struct pci_device_id *ent)
 {
+	unsigned long fbsize;
 	int ret;
 
+	fbsize = pci_resource_len(pdev, 0);
+	if (fbsize < 4 * 1024 * 1024) {
+		DRM_ERROR("less than 4 MB video memory, ignoring device\n");
+		return -ENOMEM;
+	}
+
 	ret = bochs_kick_out_firmware_fb(pdev);
 	if (ret)
 		return ret;

drivers/gpu/drm/qxl/qxl_display.c

@@ -211,6 +211,7 @@ static void qxl_crtc_destroy(struct drm_crtc *crtc)
 	struct qxl_crtc *qxl_crtc = to_qxl_crtc(crtc);
 
 	drm_crtc_cleanup(crtc);
+	qxl_bo_unref(&qxl_crtc->cursor_bo);
 	kfree(qxl_crtc);
 }
 
@@ -296,6 +297,52 @@ qxl_hide_cursor(struct qxl_device *qdev)
 	return 0;
 }
 
+static int qxl_crtc_apply_cursor(struct drm_crtc *crtc)
+{
+	struct qxl_crtc *qcrtc = to_qxl_crtc(crtc);
+	struct drm_device *dev = crtc->dev;
+	struct qxl_device *qdev = dev->dev_private;
+	struct qxl_cursor_cmd *cmd;
+	struct qxl_release *release;
+	int ret = 0;
+
+	if (!qcrtc->cursor_bo)
+		return 0;
+
+	ret = qxl_alloc_release_reserved(qdev, sizeof(*cmd),
+					 QXL_RELEASE_CURSOR_CMD,
+					 &release, NULL);
+	if (ret)
+		return ret;
+
+	ret = qxl_release_list_add(release, qcrtc->cursor_bo);
+	if (ret)
+		goto out_free_release;
+
+	ret = qxl_release_reserve_list(release, false);
+	if (ret)
+		goto out_free_release;
+
+	cmd = (struct qxl_cursor_cmd *)qxl_release_map(qdev, release);
+	cmd->type = QXL_CURSOR_SET;
+	cmd->u.set.position.x = qcrtc->cur_x + qcrtc->hot_spot_x;
+	cmd->u.set.position.y = qcrtc->cur_y + qcrtc->hot_spot_y;
+
+	cmd->u.set.shape = qxl_bo_physical_address(qdev, qcrtc->cursor_bo, 0);
+
+	cmd->u.set.visible = 1;
+	qxl_release_unmap(qdev, release, &cmd->release_info);
+
+	qxl_push_cursor_ring_release(qdev, release, QXL_CMD_CURSOR, false);
+	qxl_release_fence_buffer_objects(release);
+
+	return ret;
+
+out_free_release:
+	qxl_release_free(qdev, release);
+	return ret;
+}
+
 static int qxl_crtc_cursor_set2(struct drm_crtc *crtc,
 				struct drm_file *file_priv,
 				uint32_t handle,
@@ -400,7 +447,8 @@ static int qxl_crtc_cursor_set2(struct drm_crtc *crtc,
 	}
 	drm_gem_object_unreference_unlocked(obj);
 
-	qxl_bo_unref(&cursor_bo);
+	qxl_bo_unref (&qcrtc->cursor_bo);
+	qcrtc->cursor_bo = cursor_bo;
 
 	return ret;
 
@@ -655,6 +703,12 @@ static int qxl_crtc_mode_set(struct drm_crtc *crtc,
 			   bo->surf.stride, bo->surf.format);
 		qxl_io_create_primary(qdev, 0, bo);
 		bo->is_primary = true;
+
+		ret = qxl_crtc_apply_cursor(crtc);
+		if (ret) {
+			DRM_ERROR("could not set cursor after modeset");
+			ret = 0;
+		}
 	}
 
 	if (bo->is_primary) {

drivers/gpu/drm/qxl/qxl_drv.h

@@ -137,6 +137,7 @@ struct qxl_crtc {
 	int cur_y;
 	int hot_spot_x;
 	int hot_spot_y;
+	struct qxl_bo *cursor_bo;
 };
 
 struct qxl_output {

drivers/gpu/drm/virtio/virtgpu_drv.h

@@ -75,6 +75,7 @@ typedef void (*virtio_gpu_resp_cb)(struct virtio_gpu_device *vgdev,
 struct virtio_gpu_fence_driver {
 	atomic64_t       last_seq;
 	uint64_t         sync_seq;
+	uint64_t         context;
 	struct list_head fences;
 	spinlock_t       lock;
 };

drivers/gpu/drm/virtio/virtgpu_fence.c

@@ -89,7 +89,7 @@ int virtio_gpu_fence_emit(struct virtio_gpu_device *vgdev,
 	(*fence)->drv = drv;
 	(*fence)->seq = ++drv->sync_seq;
 	fence_init(&(*fence)->f, &virtio_fence_ops, &drv->lock,
-		   0, (*fence)->seq);
+		   drv->context, (*fence)->seq);
 	fence_get(&(*fence)->f);
 	list_add_tail(&(*fence)->node, &drv->fences);
 	spin_unlock_irqrestore(&drv->lock, irq_flags);

drivers/gpu/drm/virtio/virtgpu_ioctl.c

@@ -89,10 +89,16 @@ static void virtio_gpu_unref_list(struct list_head *head)
 	}
 }
 
-static int virtio_gpu_execbuffer(struct drm_device *dev,
-				 struct drm_virtgpu_execbuffer *exbuf,
+/*
+ * Usage of execbuffer:
+ * Relocations need to take into account the full VIRTIO_GPUDrawable size.
+ * However, the command as passed from user space must *not* contain the initial
+ * VIRTIO_GPUReleaseInfo struct (first XXX bytes)
+ */
+static int virtio_gpu_execbuffer_ioctl(struct drm_device *dev, void *data,
 				 struct drm_file *drm_file)
 {
+	struct drm_virtgpu_execbuffer *exbuf = data;
 	struct virtio_gpu_device *vgdev = dev->dev_private;
 	struct virtio_gpu_fpriv *vfpriv = drm_file->driver_priv;
 	struct drm_gem_object *gobj;
@@ -177,20 +183,6 @@ out_free:
 	return ret;
 }
 
-/*
- * Usage of execbuffer:
- * Relocations need to take into account the full VIRTIO_GPUDrawable size.
- * However, the command as passed from user space must *not* contain the initial
- * VIRTIO_GPUReleaseInfo struct (first XXX bytes)
- */
-static int virtio_gpu_execbuffer_ioctl(struct drm_device *dev, void *data,
-				       struct drm_file *file_priv)
-{
-	struct drm_virtgpu_execbuffer *execbuffer = data;
-	return virtio_gpu_execbuffer(dev, execbuffer, file_priv);
-}
-
-
 static int virtio_gpu_getparam_ioctl(struct drm_device *dev, void *data,
 				     struct drm_file *file_priv)
 {

drivers/gpu/drm/virtio/virtgpu_kms.c

@@ -159,6 +159,7 @@ int virtio_gpu_driver_load(struct drm_device *dev, unsigned long flags)
 	virtio_gpu_init_vq(&vgdev->ctrlq, virtio_gpu_dequeue_ctrl_func);
 	virtio_gpu_init_vq(&vgdev->cursorq, virtio_gpu_dequeue_cursor_func);
 
+	vgdev->fence_drv.context = fence_context_alloc(1);
 	spin_lock_init(&vgdev->fence_drv.lock);
 	INIT_LIST_HEAD(&vgdev->fence_drv.fences);
 	INIT_LIST_HEAD(&vgdev->cap_cache);

drivers/gpu/drm/virtio/virtgpu_plane.c

@@ -76,7 +76,8 @@ static void virtio_gpu_primary_plane_update(struct drm_plane *plane,
 		output = drm_crtc_to_virtio_gpu_output(plane->state->crtc);
 	if (old_state->crtc)
 		output = drm_crtc_to_virtio_gpu_output(old_state->crtc);
-	WARN_ON(!output);
+	if (WARN_ON(!output))
+		return;
 
 	if (plane->state->fb) {
 		vgfb = to_virtio_gpu_framebuffer(plane->state->fb);
@@ -129,7 +130,8 @@ static void virtio_gpu_cursor_plane_update(struct drm_plane *plane,
 		output = drm_crtc_to_virtio_gpu_output(plane->state->crtc);
 	if (old_state->crtc)
 		output = drm_crtc_to_virtio_gpu_output(old_state->crtc);
-	WARN_ON(!output);
+	if (WARN_ON(!output))
+		return;
 
 	if (plane->state->fb) {
 		vgfb = to_virtio_gpu_framebuffer(plane->state->fb);