drm/amdkfd: Fix SDMA oversubsription handling

[ Upstream commit 8c946b8988acec785bcf67088b6bd0747f36d2d3 ]

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>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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 03bec76..f9a1a4d 100644 (file)
--- a/drivers/gpu/drm/amd/amdkfd/kfd_process_queue_manager.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_process_queue_manager.c
@@ -184,6 +184,24 @@ 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) &&