drm/i915/gvt: Fix gvt scheduler interval time

BugLink: http://bugs.launchpad.net/bugs/1682130
commit 2958b9013fcbabeeba221161d0712f5259f1e15d upstream.

Fix to correctly assign 1ms for gvt scheduler interval time,
as previous code using HZ is pretty broken. And use no delay
for start gvt scheduler function.

Fixes: 4b63960ebd3f ("drm/i915/gvt: vGPU schedule policy framework")
Cc: Zhi Wang <zhi.a.wang@intel.com>
Acked-by: Chuanxiao Dong <chuanxiao.dong@intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>

diff --git a/drivers/gpu/drm/i915/gvt/sched_policy.c b/drivers/gpu/drm/i915/gvt/sched_policy.c
index 678b0be853763ab4b0381a9a4f25880ea075c7a3..3635dbe328ef0e4e6ddd66dd5be940489c5238ff 100644 (file)
--- a/drivers/gpu/drm/i915/gvt/sched_policy.c
+++ b/drivers/gpu/drm/i915/gvt/sched_policy.c
@@ -101,7 +101,7 @@ struct tbs_sched_data {
        struct list_head runq_head;
 };
 
-#define GVT_DEFAULT_TIME_SLICE (1 * HZ / 1000)
+#define GVT_DEFAULT_TIME_SLICE (msecs_to_jiffies(1))
 
 static void tbs_sched_func(struct work_struct *work)
 {
@@ -224,7 +224,7 @@ static void tbs_sched_start_schedule(struct intel_vgpu *vgpu)
                return;
 
        list_add_tail(&vgpu_data->list, &sched_data->runq_head);
-       schedule_delayed_work(&sched_data->work, sched_data->period);
+       schedule_delayed_work(&sched_data->work, 0);
 }
 
 static void tbs_sched_stop_schedule(struct intel_vgpu *vgpu)