1 files changed, 55 insertions, 1 deletions

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_device.c b/drivers/gpu/drm/amd/amdkfd/kfd_device.c
index 7e749f9b6d69..e9cfb80bd436 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_device.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_device.c
@@ -495,6 +495,7 @@ struct kfd_dev *kgd2kfd_probe(struct amdgpu_device *adev, bool vf)
 	mutex_init(&kfd->doorbell_mutex);
 
 	ida_init(&kfd->doorbell_ida);
+	atomic_set(&kfd->kfd_processes_count, 0);
 
 	return kfd;
 }
@@ -1133,7 +1134,15 @@ void kgd2kfd_interrupt(struct kfd_dev *kfd, const void *ih_ring_entry)
 	}
 
 	for (i = 0; i < kfd->num_nodes; i++) {
-		node = kfd->nodes[i];
+		/* Race if another thread in b/w
+		 * kfd_cleanup_nodes and kfree(kfd),
+		 * when kfd->nodes[i] = NULL
+		 */
+		if (kfd->nodes[i])
+			node = kfd->nodes[i];
+		else
+			return;
+
 		spin_lock_irqsave(&node->interrupt_lock, flags);
 
 		if (node->interrupts_active
@@ -1485,6 +1494,15 @@ int kgd2kfd_check_and_lock_kfd(struct kfd_dev *kfd)
 
 	mutex_lock(&kfd_processes_mutex);
 
+	/* kfd_processes_count is per kfd_dev, return -EBUSY without
+	 * further check
+	 */
+	if (!!atomic_read(&kfd->kfd_processes_count)) {
+		pr_debug("process_wq_release not finished\n");
+		r = -EBUSY;
+		goto out;
+	}
+
 	if (hash_empty(kfd_processes_table) && !kfd_is_locked(kfd))
 		goto out;
 
@@ -1550,6 +1568,25 @@ int kgd2kfd_start_sched(struct kfd_dev *kfd, uint32_t node_id)
 	return ret;
 }
 
+int kgd2kfd_start_sched_all_nodes(struct kfd_dev *kfd)
+{
+	struct kfd_node *node;
+	int i, r;
+
+	if (!kfd->init_complete)
+		return 0;
+
+	for (i = 0; i < kfd->num_nodes; i++) {
+		node = kfd->nodes[i];
+		r = node->dqm->ops.unhalt(node->dqm);
+		if (r) {
+			dev_err(kfd_device, "Error in starting scheduler\n");
+			return r;
+		}
+	}
+	return 0;
+}
+
 int kgd2kfd_stop_sched(struct kfd_dev *kfd, uint32_t node_id)
 {
 	struct kfd_node *node;
@@ -1567,6 +1604,23 @@ int kgd2kfd_stop_sched(struct kfd_dev *kfd, uint32_t node_id)
 	return node->dqm->ops.halt(node->dqm);
 }
 
+int kgd2kfd_stop_sched_all_nodes(struct kfd_dev *kfd)
+{
+	struct kfd_node *node;
+	int i, r;
+
+	if (!kfd->init_complete)
+		return 0;
+
+	for (i = 0; i < kfd->num_nodes; i++) {
+		node = kfd->nodes[i];
+		r = node->dqm->ops.halt(node->dqm);
+		if (r)
+			return r;
+	}
+	return 0;
+}
+
 bool kgd2kfd_compute_active(struct kfd_dev *kfd, uint32_t node_id)
 {
 	struct kfd_node *node;