drm/i915/gvt: clean workload queue if error happened

If a workload caused a HW GPU hang or it is in the middle of
vGPU reset, the workload queue should be cleaned up to emulate
the hang state of the GPU.

v2:
- use ENGINE_MASK(ring_id) instead of (1 << ring_id). (Zhenyu)

Signed-off-by: Chuanxiao Dong <chuanxiao.dong@intel.com>
Cc: Zhenyu Wang <zhenyuw@linux.intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>

diff --git a/drivers/gpu/drm/i915/gvt/execlist.c b/drivers/gpu/drm/i915/gvt/execlist.c
index cac669b..1648887 100644 (file)
--- a/drivers/gpu/drm/i915/gvt/execlist.c
+++ b/drivers/gpu/drm/i915/gvt/execlist.c
@@ -46,6 +46,8 @@
 #define same_context(a, b) (((a)->context_id == (b)->context_id) && \
                ((a)->lrca == (b)->lrca))
 
+static void clean_workloads(struct intel_vgpu *vgpu, unsigned long engine_mask);
+
 static int context_switch_events[] = {
        [RCS] = RCS_AS_CONTEXT_SWITCH,
        [BCS] = BCS_AS_CONTEXT_SWITCH,
@@ -512,8 +514,23 @@ static int complete_execlist_workload(struct intel_vgpu_workload *workload)
        release_shadow_batch_buffer(workload);
        release_shadow_wa_ctx(&workload->wa_ctx);
 
-       if (workload->status || (vgpu->resetting_eng & ENGINE_MASK(ring_id)))
+       if (workload->status || (vgpu->resetting_eng & ENGINE_MASK(ring_id))) {
+               /* if workload->status is not successful means HW GPU
+                * has occurred GPU hang or something wrong with i915/GVT,
+                * and GVT won't inject context switch interrupt to guest.
+                * So this error is a vGPU hang actually to the guest.
+                * According to this we should emunlate a vGPU hang. If
+                * there are pending workloads which are already submitted
+                * from guest, we should clean them up like HW GPU does.
+                *
+                * if it is in middle of engine resetting, the pending
+                * workloads won't be submitted to HW GPU and will be
+                * cleaned up during the resetting process later, so doing
+                * the workload clean up here doesn't have any impact.
+                **/
+               clean_workloads(vgpu, ENGINE_MASK(ring_id));
                goto out;
+       }
 
        if (!list_empty(workload_q_head(vgpu, ring_id))) {
                struct execlist_ctx_descriptor_format *this_desc, *next_desc;