drm/i915/gvt: move intel_runtime_pm_get out of spin_lock in stop_schedule

pm_runtime_get_sync in intel_runtime_pm_get might sleep if i915
device is not active. When stop vgpu schedule, the device may be
inactive. So need to move runtime_pm_get out of spin_lock/unlock.

Fixes: b24881e0b0b6("drm/i915/gvt: Add runtime_pm_get/put into gvt_switch_mmio
Cc: <stable@vger.kernel.org>
Signed-off-by: Hang Yuan <hang.yuan@linux.intel.com>
Signed-off-by: Xiong Zhang <xiong.y.zhang@intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>

diff --git a/drivers/gpu/drm/i915/gvt/mmio_context.c b/drivers/gpu/drm/i915/gvt/mmio_context.c
index 42e1e6b..e872f48 100644 (file)
--- a/drivers/gpu/drm/i915/gvt/mmio_context.c
+++ b/drivers/gpu/drm/i915/gvt/mmio_context.c
@@ -562,11 +562,9 @@ void intel_gvt_switch_mmio(struct intel_vgpu *pre,
         * performace for batch mmio read/write, so we need
         * handle forcewake mannually.
         */
-       intel_runtime_pm_get(dev_priv);
        intel_uncore_forcewake_get(dev_priv, FORCEWAKE_ALL);
        switch_mmio(pre, next, ring_id);
        intel_uncore_forcewake_put(dev_priv, FORCEWAKE_ALL);
-       intel_runtime_pm_put(dev_priv);
 }
 
 /**

diff --git a/drivers/gpu/drm/i915/gvt/sched_policy.c b/drivers/gpu/drm/i915/gvt/sched_policy.c
index 09d7bb7..985fe81 100644 (file)
--- a/drivers/gpu/drm/i915/gvt/sched_policy.c
+++ b/drivers/gpu/drm/i915/gvt/sched_policy.c
@@ -426,6 +426,7 @@ void intel_vgpu_stop_schedule(struct intel_vgpu *vgpu)
                &vgpu->gvt->scheduler;
        int ring_id;
        struct vgpu_sched_data *vgpu_data = vgpu->sched_data;
+       struct drm_i915_private *dev_priv = vgpu->gvt->dev_priv;
 
        if (!vgpu_data->active)
                return;
@@ -444,6 +445,7 @@ void intel_vgpu_stop_schedule(struct intel_vgpu *vgpu)
                scheduler->current_vgpu = NULL;
        }
 
+       intel_runtime_pm_get(dev_priv);
        spin_lock_bh(&scheduler->mmio_context_lock);
        for (ring_id = 0; ring_id < I915_NUM_ENGINES; ring_id++) {
                if (scheduler->engine_owner[ring_id] == vgpu) {
@@ -452,5 +454,6 @@ void intel_vgpu_stop_schedule(struct intel_vgpu *vgpu)
                }
        }
        spin_unlock_bh(&scheduler->mmio_context_lock);
+       intel_runtime_pm_put(dev_priv);
        mutex_unlock(&vgpu->gvt->sched_lock);
 }