AuxXxilium/linux_dsm_epyc7002
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drm/amdkfd: Fix sdma queue allocate race condition

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SDMA queue allocation requires the dqm lock at it modify
the global dqm members. Move up the dqm_lock so sdma
queue allocation is enclosed in the critical section. Move
mqd allocation out of critical section to avoid circular
lock dependency.

Signed-off-by: Oak Zeng <Oak.Zeng@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Oak Zeng 2019-06-06 13:19:06 -05:00 committed by Alex Deucher
parent 06b89b38f3
commit f77dac6cd6
1 changed files with 12 additions and 14 deletions
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26
drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c
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@ -1133,23 +1133,27 @@ static int create_queue_cpsch(struct device_queue_manager *dqm, struct queue *q,
if (dqm->total_queue_count >= max_num_of_queues_per_device) {
pr_warn("Can't create new usermode queue because %d queues were already created\n",
dqm->total_queue_count);
retval = -EPERM;
goto out;
return -EPERM;
}
mqd_mgr = dqm->mqd_mgrs[get_mqd_type_from_queue_type(
q->properties.type)];
q->mqd_mem_obj = mqd_mgr->allocate_mqd(mqd_mgr->dev, &q->properties);
if (!q->mqd_mem_obj)
return -ENOMEM;
dqm_lock(dqm);
if (q->properties.type == KFD_QUEUE_TYPE_SDMA ||
q->properties.type == KFD_QUEUE_TYPE_SDMA_XGMI) {
retval = allocate_sdma_queue(dqm, q);
if (retval)
goto out;
goto out_unlock;
}
retval = allocate_doorbell(qpd, q);
if (retval)
goto out_deallocate_sdma_queue;
mqd_mgr = dqm->mqd_mgrs[get_mqd_type_from_queue_type(
q->properties.type)];
/*
* Eviction state logic: mark all queues as evicted, even ones
* not currently active. Restoring inactive queues later only
@ -1161,14 +1165,8 @@ static int create_queue_cpsch(struct device_queue_manager *dqm, struct queue *q,
dqm->asic_ops.init_sdma_vm(dqm, q, qpd);
q->properties.tba_addr = qpd->tba_addr;
q->properties.tma_addr = qpd->tma_addr;
q->mqd_mem_obj = mqd_mgr->allocate_mqd(mqd_mgr->dev, &q->properties);
if (!q->mqd_mem_obj) {
retval = -ENOMEM;
goto out_deallocate_doorbell;
}
mqd_mgr->init_mqd(mqd_mgr, &q->mqd, q->mqd_mem_obj,
&q->gart_mqd_addr, &q->properties);
dqm_lock(dqm);
list_add(&q->list, &qpd->queues_list);
qpd->queue_count++;
@ -1194,13 +1192,13 @@ static int create_queue_cpsch(struct device_queue_manager *dqm, struct queue *q,
dqm_unlock(dqm);
return retval;
out_deallocate_doorbell:
deallocate_doorbell(qpd, q);
out_deallocate_sdma_queue:
if (q->properties.type == KFD_QUEUE_TYPE_SDMA ||
q->properties.type == KFD_QUEUE_TYPE_SDMA_XGMI)
deallocate_sdma_queue(dqm, q);
out:
out_unlock:
dqm_unlock(dqm);
mqd_mgr->free_mqd(mqd_mgr, q->mqd, q->mqd_mem_obj);
return retval;
}