[PATCH 10/18] drm/amdkfd: CRIU restore queue ids

[David Yat Sin]

When re-creating queues during CRIU restore, restore the queue with the
same queue id value used during CRIU dump. Adding a new private
structure queue_restore_data to store queue restore information.

Signed-off-by: Rajneesh Bhardwaj <rajneesh.bhardwaj at amd.com>
Signed-off-by: David Yat Sin <david.yatsin at amd.com>
---
 drivers/gpu/drm/amd/amdkfd/kfd_chardev.c      |  4 ++--
 drivers/gpu/drm/amd/amdkfd/kfd_dbgdev.c       |  2 +-
 drivers/gpu/drm/amd/amdkfd/kfd_priv.h         |  2 ++
 .../amd/amdkfd/kfd_process_queue_manager.c    | 22 ++++++++++++++++++-
 4 files changed, 26 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c b/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
index 6f1c9fb8d46c..813ed42e3ce6 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
@@ -312,7 +312,7 @@ static int kfd_ioctl_create_queue(struct file *filep, struct kfd_process *p,
 			p->pasid,
 			dev->id);
 
-	err = pqm_create_queue(&p->pqm, dev, filep, &q_properties, &queue_id,
+	err = pqm_create_queue(&p->pqm, dev, filep, &q_properties, &queue_id, NULL,
 			&doorbell_offset_in_process);
 	if (err != 0)
 		goto err_create_queue;
@@ -2543,7 +2543,7 @@ static int criu_restore_queue(struct kfd_process *p,
 
 	print_queue_properties(&qp);
 
-	ret = pqm_create_queue(&p->pqm, dev, NULL, &qp, &queue_id, NULL);
+	ret = pqm_create_queue(&p->pqm, dev, NULL, &qp, &queue_id, q_data, NULL);
 	if (ret) {
 		pr_err("Failed to create new queue err:%d\n", ret);
 		ret = -EINVAL;
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_dbgdev.c b/drivers/gpu/drm/amd/amdkfd/kfd_dbgdev.c
index 159add0f5aaa..749a7a3bf191 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_dbgdev.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_dbgdev.c
@@ -185,7 +185,7 @@ static int dbgdev_register_diq(struct kfd_dbgdev *dbgdev)
 	properties.type = KFD_QUEUE_TYPE_DIQ;
 
 	status = pqm_create_queue(dbgdev->pqm, dbgdev->dev, NULL,
-				&properties, &qid, NULL);
+				&properties, &qid, NULL, NULL);
 
 	if (status) {
 		pr_err("Failed to create DIQ\n");
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_priv.h b/drivers/gpu/drm/amd/amdkfd/kfd_priv.h
index 4b4808b191f2..eaf5fe1480e9 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_priv.h
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_priv.h
@@ -468,6 +468,7 @@ enum KFD_QUEUE_PRIORITY {
  * it's user mode or kernel mode queue.
  *
  */
+
 struct queue_properties {
 	enum kfd_queue_type type;
 	enum kfd_queue_format format;
@@ -1114,6 +1115,7 @@ int pqm_create_queue(struct process_queue_manager *pqm,
 			    struct file *f,
 			    struct queue_properties *properties,
 			    unsigned int *qid,
+			    const struct kfd_criu_queue_priv_data *q_data,
 			    uint32_t *p_doorbell_offset_in_process);
 int pqm_destroy_queue(struct process_queue_manager *pqm, unsigned int qid);
 int pqm_update_queue(struct process_queue_manager *pqm, unsigned int qid,
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_process_queue_manager.c b/drivers/gpu/drm/amd/amdkfd/kfd_process_queue_manager.c
index 95a6c36cea4c..e6abab16b8de 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_process_queue_manager.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_process_queue_manager.c
@@ -42,6 +42,20 @@ static inline struct process_queue_node *get_queue_by_qid(
 	return NULL;
 }
 
+static int assign_queue_slot_by_qid(struct process_queue_manager *pqm,
+				    unsigned int qid)
+{
+	if (qid >= KFD_MAX_NUM_OF_QUEUES_PER_PROCESS)
+		return -EINVAL;
+
+	if (__test_and_set_bit(qid, pqm->queue_slot_bitmap)) {
+		pr_err("Cannot create new queue because requested qid(%u) is in use\n", qid);
+		return -ENOSPC;
+	}
+
+	return 0;
+}
+
 static int find_available_queue_slot(struct process_queue_manager *pqm,
 					unsigned int *qid)
 {
@@ -193,6 +207,7 @@ int pqm_create_queue(struct process_queue_manager *pqm,
 			    struct file *f,
 			    struct queue_properties *properties,
 			    unsigned int *qid,
+			    const struct kfd_criu_queue_priv_data *q_data,
 			    uint32_t *p_doorbell_offset_in_process)
 {
 	int retval;
@@ -224,7 +239,12 @@ int pqm_create_queue(struct process_queue_manager *pqm,
 	if (pdd->qpd.queue_count >= max_queues)
 		return -ENOSPC;
 
-	retval = find_available_queue_slot(pqm, qid);
+	if (q_data) {
+		retval = assign_queue_slot_by_qid(pqm, q_data->q_id);
+		*qid = q_data->q_id;
+	} else
+		retval = find_available_queue_slot(pqm, qid);
+
 	if (retval != 0)
 		return retval;
 
-- 
2.17.1