[PATCH 2/2] drm/i915/gvt: cancel scheduler timer when no vGPU exists

[Wang, Zhi A]

Reviewed-by: Zhi Wang <zhi.a.wang at intel.com>

-----Original Message-----
From: intel-gvt-dev [mailto:intel-gvt-dev-bounces at lists.freedesktop.org] On Behalf Of Zhenyu Wang
Sent: Monday, January 15, 2018 10:36 AM
To: intel-gvt-dev at lists.freedesktop.org
Subject: [PATCH 2/2] drm/i915/gvt: cancel scheduler timer when no vGPU exists

Stop gvt scheduler timer if no vGPU exists, otherwise it keeps gvt service thread busy to handle request schedule event but no actual schedule activity required.

Signed-off-by: Zhenyu Wang <zhenyuw at linux.intel.com>
---
 drivers/gpu/drm/i915/gvt/sched_policy.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/gpu/drm/i915/gvt/sched_policy.c b/drivers/gpu/drm/i915/gvt/sched_policy.c
index eea1a2f92099..d031f6486ce3 100644
--- a/drivers/gpu/drm/i915/gvt/sched_policy.c
+++ b/drivers/gpu/drm/i915/gvt/sched_policy.c
@@ -308,8 +308,15 @@ static int tbs_sched_init_vgpu(struct intel_vgpu *vgpu)
 
 static void tbs_sched_clean_vgpu(struct intel_vgpu *vgpu)  {
+	struct intel_gvt *gvt = vgpu->gvt;
+	struct gvt_sched_data *sched_data = gvt->scheduler.sched_data;
+
 	kfree(vgpu->sched_data);
 	vgpu->sched_data = NULL;
+
+	/* this vgpu id has been removed */
+	if (idr_is_empty(&gvt->vgpu_idr))
+		hrtimer_cancel(&sched_data->timer);
 }
 
 static void tbs_sched_start_schedule(struct intel_vgpu *vgpu)
--
2.15.1

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