From: Pei Zhang Date: Wed, 16 Nov 2016 11:05:50 +0000 (+0800) Subject: drm/i915/gvt: check workload empty before real scan X-Git-Tag: v4.10-rc1~154^2~21^2~39^2~2 X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=0aaee4cc834261dcfbfb57559442777344ee8cb5;p=karo-tx-linux.git drm/i915/gvt: check workload empty before real scan This patch will fix warning log print during command scan caused by empty workload (ring head equals tail). This patch avoid going into real scan process if workload is empty. It's guest's responsibility to make sure if an empty workload is proper to submit to HW. [v2] modify the patch description. It's a fix, not a w/a. Signed-off-by: Pei Zhang Signed-off-by: Zhenyu Wang --- diff --git a/drivers/gpu/drm/i915/gvt/cmd_parser.c b/drivers/gpu/drm/i915/gvt/cmd_parser.c index 1238b75fe3f8..d26a092c70e8 100644 --- a/drivers/gpu/drm/i915/gvt/cmd_parser.c +++ b/drivers/gpu/drm/i915/gvt/cmd_parser.c @@ -2537,7 +2537,8 @@ static int scan_workload(struct intel_vgpu_workload *workload) s.rb_va = workload->shadow_ring_buffer_va; s.workload = workload; - if (bypass_scan_mask & (1 << workload->ring_id)) + if ((bypass_scan_mask & (1 << workload->ring_id)) || + gma_head == gma_tail) return 0; ret = ip_gma_set(&s, gma_head);