From: Gerd Hoffmann <kraxel@xxxxxxxxxx> commit 3e93bc2a58aa241081e043ef9e6e86c42808499a upstream. Also update the comment with a reference to the virglrenderer fix. Signed-off-by: Gerd Hoffmann <kraxel@xxxxxxxxxx> Reviewed-by: Chia-I Wu <olvaffe@xxxxxxxxx> Link: http://patchwork.freedesktop.org/patch/msgid/20190822102614.18164-1-kraxel@xxxxxxxxxx Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/gpu/drm/virtio/virtgpu_object.c | 44 +++++++++++++++++--------------- 1 file changed, 24 insertions(+), 20 deletions(-) --- a/drivers/gpu/drm/virtio/virtgpu_object.c +++ b/drivers/gpu/drm/virtio/virtgpu_object.c @@ -27,34 +27,38 @@ #include "virtgpu_drv.h" +static int virtio_gpu_virglrenderer_workaround = 1; +module_param_named(virglhack, virtio_gpu_virglrenderer_workaround, int, 0400); + 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; + if (virtio_gpu_virglrenderer_workaround) { + /* + * Hack to avoid re-using resource IDs. + * + * virglrenderer versions up to (and including) 0.7.0 + * can't deal with that. virglrenderer commit + * "f91a9dd35715 Fix unlinking resources from hash + * table." (Feb 2019) fixes the bug. + */ + static int handle; + handle++; + *resid = handle + 1; + } else { + int handle = ida_alloc(&vgdev->resource_ida, GFP_KERNEL); + if (handle < 0) + return handle; + *resid = handle + 1; + } return 0; } 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 + if (!virtio_gpu_virglrenderer_workaround) { + ida_free(&vgdev->resource_ida, id - 1); + } } static void virtio_gpu_ttm_bo_destroy(struct ttm_buffer_object *tbo)
