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authorGerd Hoffmann <kraxel@redhat.com>2019-02-08 15:04:09 +0100
committerDave Airlie <airlied@redhat.com>2019-02-11 14:44:10 +1000
commit16065fcdd19ddb9e093192914ac863884f308766 (patch)
tree29c369003e067cd02fd93ded26d66d4f1619787d
parentf4bc54b532a62d8bee421ca06adb6d1b3e7ffaa9 (diff)
drm/virtio: do NOT reuse resource ids
Bisected guest kernel changes crashing qemu. Landed at "6c1cd97bda drm/virtio: fix resource id handling". Looked again, and noticed we where not only leaking *some* ids, but *all* ids. The old code never ever called virtio_gpu_resource_id_put(). So, commit 6c1cd97bda effectively makes the linux kernel starting re-using IDs after releasing them, and apparently virglrenderer can't deal with that. Oops. This patch puts a temporary stopgap into place for the 5.0 release. Signed-off-by: Gerd Hoffmann <kraxel@redhat.com> Reviewed-by: Dave Airlie <airlied@redhat.com> Signed-off-by: Dave Airlie <airlied@redhat.com> Link: https://patchwork.freedesktop.org/patch/msgid/20190208140409.15280-1-kraxel@redhat.com
-rw-r--r--drivers/gpu/drm/virtio/virtgpu_object.c13
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/gpu/drm/virtio/virtgpu_object.c b/drivers/gpu/drm/virtio/virtgpu_object.c
index f39a183d59c2..e7e946035027 100644
--- a/drivers/gpu/drm/virtio/virtgpu_object.c
+++ b/drivers/gpu/drm/virtio/virtgpu_object.c
@@ -28,10 +28,21 @@
static int virtio_gpu_resource_id_get(struct virtio_gpu_device *vgdev,
uint32_t *resid)
{
+#if 0
int handle = ida_alloc(&vgdev->resource_ida, GFP_KERNEL);
if (handle < 0)
return handle;
+#else
+ static int handle;
+
+ /*
+ * FIXME: dirty hack to avoid re-using IDs, virglrenderer
+ * can't deal with that. Needs fixing in virglrenderer, also
+ * should figure a better way to handle that in the guest.
+ */
+ handle++;
+#endif
*resid = handle + 1;
return 0;
@@ -39,7 +50,9 @@ static int virtio_gpu_resource_id_get(struct virtio_gpu_device *vgdev,
static void virtio_gpu_resource_id_put(struct virtio_gpu_device *vgdev, uint32_t id)
{
+#if 0
ida_free(&vgdev->resource_ida, id - 1);
+#endif
}
static void virtio_gpu_ttm_bo_destroy(struct ttm_buffer_object *tbo)