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authorGerd Hoffmann <kraxel@redhat.com>2019-08-22 12:26:14 +0200
committerGerd Hoffmann <kraxel@redhat.com>2019-08-27 07:35:08 +0200
commit3e93bc2a58aa241081e043ef9e6e86c42808499a (patch)
tree55450e97b2b3000bad3305a6af4fa1592b5a9451 /drivers/gpu/drm/virtio
parent15c665bb4637310bc8ce5f357b6a6e5a8aafc7c1 (diff)
drm/virtio: make resource id workaround runtime switchable.
Also update the comment with a reference to the virglrenderer fix. Signed-off-by: Gerd Hoffmann <kraxel@redhat.com> Reviewed-by: Chia-I Wu <olvaffe@gmail.com> Link: http://patchwork.freedesktop.org/patch/msgid/20190822102614.18164-1-kraxel@redhat.com
Diffstat (limited to 'drivers/gpu/drm/virtio')
-rw-r--r--drivers/gpu/drm/virtio/virtgpu_object.c44
1 files changed, 24 insertions, 20 deletions
diff --git a/drivers/gpu/drm/virtio/virtgpu_object.c b/drivers/gpu/drm/virtio/virtgpu_object.c
index b2da31310d24..e98aaa00578d 100644
--- 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)