From: Zhenyu Wang <zhenyuw@linux.intel.com>
Date: Mon, 4 Dec 2017 02:42:58 +0000 (+0800)
Subject: drm/i915/gvt: set max priority for gvt context
X-Git-Tag: v4.15-rc3~10^2~1^2^2
X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=11474e9091cf2002e948647fd9f63a7f027e488a;p=linux.git

drm/i915/gvt: set max priority for gvt context

This is to workaround guest driver hang regression after
preemption enable that gvt hasn't enabled handling of that
for guest workload. So in effect this disables preemption
for gvt context now.

Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
(cherry picked from commit 1603660b3342269c95fcafee1945790342a8c28e)
---

diff --git a/drivers/gpu/drm/i915/gvt/scheduler.c b/drivers/gpu/drm/i915/gvt/scheduler.c
index ab3d041ee5f9..69f8f0d155b9 100644
--- a/drivers/gpu/drm/i915/gvt/scheduler.c
+++ b/drivers/gpu/drm/i915/gvt/scheduler.c
@@ -757,6 +757,9 @@ int intel_vgpu_init_gvt_context(struct intel_vgpu *vgpu)
 	if (IS_ERR(vgpu->shadow_ctx))
 		return PTR_ERR(vgpu->shadow_ctx);
 
+	if (INTEL_INFO(vgpu->gvt->dev_priv)->has_logical_ring_preemption)
+		vgpu->shadow_ctx->priority = INT_MAX;
+
 	vgpu->shadow_ctx->engine[RCS].initialised = true;
 
 	bitmap_zero(vgpu->shadow_ctx_desc_updated, I915_NUM_ENGINES);