drm/amdkfd: Fix SDMA oversubsription handling

SDMA only supports a fixed number of queues. HWS cannot handle
oversubscription.

Signed-off-by: shaoyun liu <shaoyun.liu@amd.com>
Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
Reviewed-by: Oded Gabbay <oded.gabbay@gmail.com>
Signed-off-by: Oded Gabbay <oded.gabbay@gmail.com>

1 files changed, 18 insertions, 0 deletions

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 2bec902fc939..a3f1e62c60ba 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_process_queue_manager.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_process_queue_manager.c
@@ -191,6 +191,24 @@ int pqm_create_queue(struct process_queue_manager *pqm,
 
         switch (type) {
         case KFD_QUEUE_TYPE_SDMA:
+                if (dev->dqm->queue_count >=
+                        CIK_SDMA_QUEUES_PER_ENGINE * CIK_SDMA_ENGINE_NUM) {
+                        pr_err("Over-subscription is not allowed for SDMA.\n");
+                        retval = -EPERM;
+                        goto err_create_queue;
+                }
+
+                retval = create_cp_queue(pqm, dev, &q, properties, f, *qid);
+                if (retval != 0)
+                        goto err_create_queue;
+                pqn->q = q;
+                pqn->kq = NULL;
+                retval = dev->dqm->ops.create_queue(dev->dqm, q, &pdd->qpd,
+                                                &q->properties.vmid);
+                pr_debug("DQM returned %d for create_queue\n", retval);
+                print_queue(q);
+                break;
+
         case KFD_QUEUE_TYPE_COMPUTE:
                 /* check if there is over subscription */
                 if ((sched_policy == KFD_SCHED_POLICY_HWS_NO_OVERSUBSCRIPTION) &&