Am 20.04.22 um 21:28 schrieb Zack Rusin:
[SNIP]
To figure out what it is could you try the following code fragment:
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_validation.c b/drivers/gpu/drm/vmwgfx/vmwgfx_validation.c index f46891012be3..a36f89d3f36d 100644 --- a/drivers/gpu/drm/vmwgfx/vmwgfx_validation.c +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_validation.c @@ -288,7 +288,7 @@ int vmw_validation_add_bo(struct vmw_validation_context *ctx, val_buf->bo = ttm_bo_get_unless_zero(&vbo->base); if (!val_buf->bo) return -ESRCH; - val_buf->num_shared = 0; + val_buf->num_shared = 16; list_add_tail(&val_buf->head, &ctx->bo_list); bo_node->as_mob = as_mob; bo_node->cpu_blit = cpu_blit;
Fails the same BUG_ON with num_fences and max_fences == 0.
Thanks for testing this.
So the buffer object is not reserved through vmw_validation_bo_reserve(), but comes from somewhere else. Unfortunately I absolutely can't find where that's coming from.
Do you have some documentation howto setup vmwgfx? E.g. sample VM which I can download somewhere etc..
Thanks, Christian.
z