From 0aaee4cc834261dcfbfb57559442777344ee8cb5 Mon Sep 17 00:00:00 2001 From: Pei Zhang Date: Wed, 16 Nov 2016 19:05:50 +0800 Subject: [PATCH] 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 --- drivers/gpu/drm/i915/gvt/cmd_parser.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/i915/gvt/cmd_parser.c b/drivers/gpu/drm/i915/gvt/cmd_parser.c index 1238b75..d26a092 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); -- 2.7.4