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drm/i915/gvt: check workload empty before real scan

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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 <pei.zhang@intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
This commit is contained in:
Pei Zhang 2016-11-16 19:05:50 +08:00 committed by Zhenyu Wang
parent a3614a868f
commit 0aaee4cc83
1 changed files with 2 additions and 1 deletions
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3
drivers/gpu/drm/i915/gvt/cmd_parser.c
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@ -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);