4.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: Felix Kuehling <Felix.Kuehling@xxxxxxx>
[ Upstream commit 8c946b8988acec785bcf67088b6bd0747f36d2d3 ]
SDMA only supports a fixed number of queues. HWS cannot handle
oversubscription.
Signed-off-by: shaoyun liu <shaoyun.liu@xxxxxxx>
Signed-off-by: Felix Kuehling <Felix.Kuehling@xxxxxxx>
Reviewed-by: Oded Gabbay <oded.gabbay@xxxxxxxxx>
Signed-off-by: Oded Gabbay <oded.gabbay@xxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/amd/amdkfd/kfd_process_queue_manager.c | 18 +++++++++++++++++
1 file changed, 18 insertions(+)
--- a/drivers/gpu/drm/amd/amdkfd/kfd_process_queue_manager.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_process_queue_manager.c
@@ -205,6 +205,24 @@ int pqm_create_queue(struct process_queu
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) &&