Merge tag 'gvt-fixes-2017-07-11' of https://github.com/01org/gvt-linux into drm-intel-next-fixes

gvt-fixes-2017-07-11

- Revert "drm/i915/gvt: Fix possible recursive locking issue" (Chuanxiao),
  which is incomplete fix and it's actually VFIO issue, so revert.
- remove unneeded scheduler mutex for performance fix (Weinan)
- other misc error handling fix and cmd address audit
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170711055333.jhrmvx6ilvg2qlnn@zhen-hp.sh.intel.com

drivers/gpu/drm/i915/gvt/cmd_parser.c

@@ -2536,6 +2536,11 @@ static int scan_workload(struct intel_vgpu_workload *workload)
 		gma_head == gma_tail)
 		return 0;
 
+	if (!intel_gvt_ggtt_validate_range(s.vgpu, s.ring_start, s.ring_size)) {
+		ret = -EINVAL;
+		goto out;
+	}
+
 	ret = ip_gma_set(&s, gma_head);
 	if (ret)
 		goto out;
@@ -2579,6 +2584,11 @@ static int scan_wa_ctx(struct intel_shadow_wa_ctx *wa_ctx)
 	s.rb_va = wa_ctx->indirect_ctx.shadow_va;
 	s.workload = workload;
 
+	if (!intel_gvt_ggtt_validate_range(s.vgpu, s.ring_start, s.ring_size)) {
+		ret = -EINVAL;
+		goto out;
+	}
+
 	ret = ip_gma_set(&s, gma_head);
 	if (ret)
 		goto out;

drivers/gpu/drm/i915/gvt/gtt.c

@@ -2259,6 +2259,8 @@ int intel_gvt_init_gtt(struct intel_gvt *gvt)
 		ret = setup_spt_oos(gvt);
 		if (ret) {
 			gvt_err("fail to initialize SPT oos\n");
+			dma_unmap_page(dev, daddr, 4096, PCI_DMA_BIDIRECTIONAL);
+			__free_page(gvt->gtt.scratch_ggtt_page);
 			return ret;
 		}
 	}

drivers/gpu/drm/i915/gvt/gvt.h

@@ -182,9 +182,6 @@ struct intel_vgpu {
 		struct kvm *kvm;
 		struct work_struct release_work;
 		atomic_t released;
-		struct work_struct unpin_work;
-		spinlock_t unpin_lock; /* To protect unpin_list */
-		struct list_head unpin_list;
 	} vdev;
 #endif
 };

drivers/gpu/drm/i915/gvt/kvmgt.c

@@ -78,7 +78,6 @@ struct gvt_dma {
 	struct rb_node node;
 	gfn_t gfn;
 	unsigned long iova;
-	struct list_head list;
 };
 
 static inline bool handle_valid(unsigned long handle)
@@ -167,7 +166,6 @@ static void gvt_cache_add(struct intel_vgpu *vgpu, gfn_t gfn,
 
 	new->gfn = gfn;
 	new->iova = iova;
-	INIT_LIST_HEAD(&new->list);
 
 	mutex_lock(&vgpu->vdev.cache_lock);
 	while (*link) {
@@ -199,52 +197,26 @@ static void __gvt_cache_remove_entry(struct intel_vgpu *vgpu,
 	kfree(entry);
 }
 
-static void intel_vgpu_unpin_work(struct work_struct *work)
+static void gvt_cache_remove(struct intel_vgpu *vgpu, gfn_t gfn)
 {
-	struct intel_vgpu *vgpu = container_of(work, struct intel_vgpu,
-					       vdev.unpin_work);
 	struct device *dev = mdev_dev(vgpu->vdev.mdev);
 	struct gvt_dma *this;
-	unsigned long gfn;
-
-	for (;;) {
-		spin_lock(&vgpu->vdev.unpin_lock);
-		if (list_empty(&vgpu->vdev.unpin_list)) {
-			spin_unlock(&vgpu->vdev.unpin_lock);
-			break;
-		}
-		this = list_first_entry(&vgpu->vdev.unpin_list,
-					struct gvt_dma, list);
-		list_del(&this->list);
-		spin_unlock(&vgpu->vdev.unpin_lock);
-
-		gfn = this->gfn;
-		vfio_unpin_pages(dev, &gfn, 1);
-		kfree(this);
-	}
-}
-
-static bool gvt_cache_mark_remove(struct intel_vgpu *vgpu, gfn_t gfn)
-{
-	struct gvt_dma *this;
+	unsigned long g1;
+	int rc;
 
 	mutex_lock(&vgpu->vdev.cache_lock);
 	this  = __gvt_cache_find(vgpu, gfn);
 	if (!this) {
 		mutex_unlock(&vgpu->vdev.cache_lock);
-		return false;
+		return;
 	}
+
+	g1 = gfn;
 	gvt_dma_unmap_iova(vgpu, this->iova);
-	/* remove this from rb tree */
-	rb_erase(&this->node, &vgpu->vdev.cache);
+	rc = vfio_unpin_pages(dev, &g1, 1);
+	WARN_ON(rc != 1);
+	__gvt_cache_remove_entry(vgpu, this);
 	mutex_unlock(&vgpu->vdev.cache_lock);
-
-	/* put this to the unpin_list */
-	spin_lock(&vgpu->vdev.unpin_lock);
-	list_move_tail(&this->list, &vgpu->vdev.unpin_list);
-	spin_unlock(&vgpu->vdev.unpin_lock);
-
-	return true;
 }
 
 static void gvt_cache_init(struct intel_vgpu *vgpu)
@@ -485,9 +457,6 @@ static int intel_vgpu_create(struct kobject *kobj, struct mdev_device *mdev)
 	}
 
 	INIT_WORK(&vgpu->vdev.release_work, intel_vgpu_release_work);
-	INIT_WORK(&vgpu->vdev.unpin_work, intel_vgpu_unpin_work);
-	spin_lock_init(&vgpu->vdev.unpin_lock);
-	INIT_LIST_HEAD(&vgpu->vdev.unpin_list);
 
 	vgpu->vdev.mdev = mdev;
 	mdev_set_drvdata(mdev, vgpu);
@@ -517,7 +486,6 @@ static int intel_vgpu_iommu_notifier(struct notifier_block *nb,
 	struct intel_vgpu *vgpu = container_of(nb,
 					struct intel_vgpu,
 					vdev.iommu_notifier);
-	bool sched_unmap = false;
 
 	if (action == VFIO_IOMMU_NOTIFY_DMA_UNMAP) {
 		struct vfio_iommu_type1_dma_unmap *unmap = data;
@@ -527,10 +495,7 @@ static int intel_vgpu_iommu_notifier(struct notifier_block *nb,
 		end_gfn = gfn + unmap->size / PAGE_SIZE;
 
 		while (gfn < end_gfn)
-			sched_unmap |= gvt_cache_mark_remove(vgpu, gfn++);
-
-		if (sched_unmap)
-			schedule_work(&vgpu->vdev.unpin_work);
+			gvt_cache_remove(vgpu, gfn++);
 	}
 
 	return NOTIFY_OK;

drivers/gpu/drm/i915/gvt/scheduler.c

@@ -174,15 +174,6 @@ static int shadow_context_status_change(struct notifier_block *nb,
 		atomic_set(&workload->shadow_ctx_active, 1);
 		break;
 	case INTEL_CONTEXT_SCHEDULE_OUT:
-		/* If the status is -EINPROGRESS means this workload
-		 * doesn't meet any issue during dispatching so when
-		 * get the SCHEDULE_OUT set the status to be zero for
-		 * good. If the status is NOT -EINPROGRESS means there
-		 * is something wrong happened during dispatching and
-		 * the status should not be set to zero
-		 */
-		if (workload->status == -EINPROGRESS)
-			workload->status = 0;
 		atomic_set(&workload->shadow_ctx_active, 0);
 		break;
 	default:
@@ -427,6 +418,18 @@ static void complete_current_workload(struct intel_gvt *gvt, int ring_id)
 		wait_event(workload->shadow_ctx_status_wq,
 			   !atomic_read(&workload->shadow_ctx_active));
 
+		/* If this request caused GPU hang, req->fence.error will
+		 * be set to -EIO. Use -EIO to set workload status so
+		 * that when this request caused GPU hang, didn't trigger
+		 * context switch interrupt to guest.
+		 */
+		if (likely(workload->status == -EINPROGRESS)) {
+			if (workload->req->fence.error == -EIO)
+				workload->status = -EIO;
+			else
+				workload->status = 0;
+		}
+
 		i915_gem_request_put(fetch_and_zero(&workload->req));
 
 		if (!workload->status && !vgpu->resetting) {
@@ -464,8 +467,6 @@ 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;
@@ -497,8 +498,6 @@ static int workload_thread(void *priv)
 		if (!workload)
 			break;
 
-		mutex_lock(&scheduler_mutex);
-
 		gvt_dbg_sched("ring id %d next workload %p vgpu %d\n",
 				workload->ring_id, workload,
 				workload->vgpu->id);
@@ -537,9 +536,6 @@ static int workload_thread(void *priv)
 					FORCEWAKE_ALL);
 
 		intel_runtime_pm_put(gvt->dev_priv);
-
-		mutex_unlock(&scheduler_mutex);
-
 	}
 	return 0;
 }