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drm/i915/gvt: Stop waiting whilst holding struct_mutex

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For whatever reason, the gvt scheduler runs synchronously. At the very
least, lets run synchronously without holding the struct_mutex.

v2: cut'n'paste mutex_lock instead of unlock.
Replace long hold of struct_mutex with a mutex to serialise the worker
threads.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
This commit is contained in:
Chris Wilson 2016-10-19 11:11:44 +01:00 committed by Zhenyu Wang
parent f460c251ea
commit 66bbc3b2b1
1 changed files with 13 additions and 9 deletions
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22
drivers/gpu/drm/i915/gvt/scheduler.c
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@ -390,6 +390,8 @@ struct workload_thread_param {
int ring_id;
};
static DEFINE_MUTEX(scheduler_mutex);
static int workload_thread(void *priv)
{
struct workload_thread_param *p = (struct workload_thread_param *)priv;
@ -414,17 +416,14 @@ static int workload_thread(void *priv)
if (kthread_should_stop())
break;
mutex_lock(&scheduler_mutex);
gvt_dbg_sched("ring id %d next workload %p vgpu %d\n",
workload->ring_id, workload,
workload->vgpu->id);
intel_runtime_pm_get(gvt->dev_priv);
/*
* Always take i915 big lock first
*/
mutex_lock(&gvt->dev_priv->drm.struct_mutex);
gvt_dbg_sched("ring id %d will dispatch workload %p\n",
workload->ring_id, workload);
@ -432,7 +431,10 @@ static int workload_thread(void *priv)
intel_uncore_forcewake_get(gvt->dev_priv,
FORCEWAKE_ALL);
mutex_lock(&gvt->dev_priv->drm.struct_mutex);
ret = dispatch_workload(workload);
mutex_unlock(&gvt->dev_priv->drm.struct_mutex);
if (ret) {
gvt_err("fail to dispatch workload, skip\n");
goto complete;
@ -442,8 +444,7 @@ static int workload_thread(void *priv)
workload->ring_id, workload);
workload->status = i915_wait_request(workload->req,
I915_WAIT_LOCKED,
NULL, NULL);
0, NULL, NULL);
if (workload->status != 0)
gvt_err("fail to wait workload, skip\n");
@ -451,7 +452,9 @@ complete:
gvt_dbg_sched("will complete workload %p\n, status: %d\n",
workload, workload->status);
mutex_lock(&gvt->dev_priv->drm.struct_mutex);
complete_current_workload(gvt, ring_id);
mutex_unlock(&gvt->dev_priv->drm.struct_mutex);
i915_gem_request_put(fetch_and_zero(&workload->req));
@ -459,9 +462,10 @@ complete:
intel_uncore_forcewake_put(gvt->dev_priv,
FORCEWAKE_ALL);
mutex_unlock(&gvt->dev_priv->drm.struct_mutex);
intel_runtime_pm_put(gvt->dev_priv);
mutex_unlock(&scheduler_mutex);
}
return 0;
}