1 files changed, 96 insertions, 41 deletions

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_process.c b/drivers/gpu/drm/amd/amdkfd/kfd_process.c
index c74cf22a1ed9..3ccb3b53216e 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_process.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_process.c
@@ -171,18 +171,17 @@ static void kfd_process_wq_release(struct work_struct *work)
 		pr_debug("Releasing pdd (topology id %d) for process (pasid %d) in workqueue\n",
 				pdd->dev->id, p->pasid);
 
-		if (pdd->reset_wavefronts)
-			dbgdev_wave_reset_wavefronts(pdd->dev, p);
+		if (pdd->bound == PDD_BOUND)
+			amd_iommu_unbind_pasid(pdd->dev->pdev, p->pasid);
 
-		amd_iommu_unbind_pasid(pdd->dev->pdev, p->pasid);
 		list_del(&pdd->per_device_list);
-
 		kfree(pdd);
 	}
 
 	kfd_event_free_process(p);
 
 	kfd_pasid_free(p->pasid);
+	kfd_free_process_doorbells(p);
 
 	mutex_unlock(&p->mutex);
 
@@ -235,24 +234,17 @@ static void kfd_process_notifier_release(struct mmu_notifier *mn,
 
 	mutex_lock(&p->mutex);
 
-	/* In case our notifier is called before IOMMU notifier */
+	kfd_process_dequeue_from_all_devices(p);
 	pqm_uninit(&p->pqm);
 
 	/* Iterate over all process device data structure and check
-	 * if we should delete debug managers and reset all wavefronts
+	 * if we should delete debug managers
 	 */
-	list_for_each_entry(pdd, &p->per_device_data, per_device_list) {
+	list_for_each_entry(pdd, &p->per_device_data, per_device_list)
 		if ((pdd->dev->dbgmgr) &&
 				(pdd->dev->dbgmgr->pasid == p->pasid))
 			kfd_dbgmgr_destroy(pdd->dev->dbgmgr);
 
-		if (pdd->reset_wavefronts) {
-			pr_warn("Resetting all wave fronts\n");
-			dbgdev_wave_reset_wavefronts(pdd->dev, p);
-			pdd->reset_wavefronts = false;
-		}
-	}
-
 	mutex_unlock(&p->mutex);
 
 	/*
@@ -288,6 +280,9 @@ static struct kfd_process *create_process(const struct task_struct *thread)
 	if (process->pasid == 0)
 		goto err_alloc_pasid;
 
+	if (kfd_alloc_process_doorbells(process) < 0)
+		goto err_alloc_doorbells;
+
 	mutex_init(&process->mutex);
 
 	process->mm = thread->mm;
@@ -329,6 +324,8 @@ err_process_pqm_init:
 	mmu_notifier_unregister_no_release(&process->mmu_notifier, process->mm);
 err_mmu_notifier:
 	mutex_destroy(&process->mutex);
+	kfd_free_process_doorbells(process);
+err_alloc_doorbells:
 	kfd_pasid_free(process->pasid);
 err_alloc_pasid:
 	kfree(process->queues);
@@ -345,9 +342,9 @@ struct kfd_process_device *kfd_get_process_device_data(struct kfd_dev *dev,
 
 	list_for_each_entry(pdd, &p->per_device_data, per_device_list)
 		if (pdd->dev == dev)
-			break;
+			return pdd;
 
-	return pdd;
+	return NULL;
 }
 
 struct kfd_process_device *kfd_create_process_device_data(struct kfd_dev *dev,
@@ -361,7 +358,9 @@ struct kfd_process_device *kfd_create_process_device_data(struct kfd_dev *dev,
 		INIT_LIST_HEAD(&pdd->qpd.queues_list);
 		INIT_LIST_HEAD(&pdd->qpd.priv_queue_list);
 		pdd->qpd.dqm = dev->dqm;
-		pdd->reset_wavefronts = false;
+		pdd->process = p;
+		pdd->bound = PDD_UNBOUND;
+		pdd->already_dequeued = false;
 		list_add(&pdd->per_device_list, &p->per_device_data);
 	}
 
@@ -387,19 +386,91 @@ struct kfd_process_device *kfd_bind_process_to_device(struct kfd_dev *dev,
 		return ERR_PTR(-ENOMEM);
 	}
 
-	if (pdd->bound)
+	if (pdd->bound == PDD_BOUND) {
 		return pdd;
+	} else if (unlikely(pdd->bound == PDD_BOUND_SUSPENDED)) {
+		pr_err("Binding PDD_BOUND_SUSPENDED pdd is unexpected!\n");
+		return ERR_PTR(-EINVAL);
+	}
 
 	err = amd_iommu_bind_pasid(dev->pdev, p->pasid, p->lead_thread);
 	if (err < 0)
 		return ERR_PTR(err);
 
-	pdd->bound = true;
+	pdd->bound = PDD_BOUND;
 
 	return pdd;
 }
 
-void kfd_unbind_process_from_device(struct kfd_dev *dev, unsigned int pasid)
+/*
+ * Bind processes do the device that have been temporarily unbound
+ * (PDD_BOUND_SUSPENDED) in kfd_unbind_processes_from_device.
+ */
+int kfd_bind_processes_to_device(struct kfd_dev *dev)
+{
+	struct kfd_process_device *pdd;
+	struct kfd_process *p;
+	unsigned int temp;
+	int err = 0;
+
+	int idx = srcu_read_lock(&kfd_processes_srcu);
+
+	hash_for_each_rcu(kfd_processes_table, temp, p, kfd_processes) {
+		mutex_lock(&p->mutex);
+		pdd = kfd_get_process_device_data(dev, p);
+		if (pdd->bound != PDD_BOUND_SUSPENDED) {
+			mutex_unlock(&p->mutex);
+			continue;
+		}
+
+		err = amd_iommu_bind_pasid(dev->pdev, p->pasid,
+				p->lead_thread);
+		if (err < 0) {
+			pr_err("unexpected pasid %d binding failure\n",
+					p->pasid);
+			mutex_unlock(&p->mutex);
+			break;
+		}
+
+		pdd->bound = PDD_BOUND;
+		mutex_unlock(&p->mutex);
+	}
+
+	srcu_read_unlock(&kfd_processes_srcu, idx);
+
+	return err;
+}
+
+/*
+ * Temporarily unbind currently bound processes from the device and
+ * mark them as PDD_BOUND_SUSPENDED. These processes will be restored
+ * to PDD_BOUND state in kfd_bind_processes_to_device.
+ */
+void kfd_unbind_processes_from_device(struct kfd_dev *dev)
+{
+	struct kfd_process_device *pdd;
+	struct kfd_process *p;
+	unsigned int temp, temp_bound, temp_pasid;
+
+	int idx = srcu_read_lock(&kfd_processes_srcu);
+
+	hash_for_each_rcu(kfd_processes_table, temp, p, kfd_processes) {
+		mutex_lock(&p->mutex);
+		pdd = kfd_get_process_device_data(dev, p);
+		temp_bound = pdd->bound;
+		temp_pasid = p->pasid;
+		if (pdd->bound == PDD_BOUND)
+			pdd->bound = PDD_BOUND_SUSPENDED;
+		mutex_unlock(&p->mutex);
+
+		if (temp_bound == PDD_BOUND)
+			amd_iommu_unbind_pasid(dev->pdev, temp_pasid);
+	}
+
+	srcu_read_unlock(&kfd_processes_srcu, idx);
+}
+
+void kfd_process_iommu_unbind_callback(struct kfd_dev *dev, unsigned int pasid)
 {
 	struct kfd_process *p;
 	struct kfd_process_device *pdd;
@@ -418,28 +489,12 @@ void kfd_unbind_process_from_device(struct kfd_dev *dev, unsigned int pasid)
 	if ((dev->dbgmgr) && (dev->dbgmgr->pasid == p->pasid))
 		kfd_dbgmgr_destroy(dev->dbgmgr);
 
-	pqm_uninit(&p->pqm);
-
 	pdd = kfd_get_process_device_data(dev, p);
-
-	if (!pdd) {
-		mutex_unlock(&p->mutex);
-		return;
-	}
-
-	if (pdd->reset_wavefronts) {
-		dbgdev_wave_reset_wavefronts(pdd->dev, p);
-		pdd->reset_wavefronts = false;
-	}
-
-	/*
-	 * Just mark pdd as unbound, because we still need it
-	 * to call amd_iommu_unbind_pasid() in when the
-	 * process exits.
-	 * We don't call amd_iommu_unbind_pasid() here
-	 * because the IOMMU called us.
-	 */
-	pdd->bound = false;
+	if (pdd)
+		/* For GPU relying on IOMMU, we need to dequeue here
+		 * when PASID is still bound.
+		 */
+		kfd_process_dequeue_from_device(pdd);
 
 	mutex_unlock(&p->mutex);
 }