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drm/amdkfd: avoid HMM change cause circular lock 

There is circular lock between gfx and kfd path with HMM change:
lock(dqm) -> bo::reserve -> amdgpu_mn_lock

To avoid this, move init/unint_mqd() out of lock(dqm), to remove nested
locking between mmap_sem and bo::reserve. The locking order
is: bo::reserve -> amdgpu_mn_lock(p->mn)

Signed-off-by: Philip Yang <Philip.Yang@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Acked-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Philip Yang 2018-12-05 14:03:43 -05:00 committed by Alex Deucher
parent 2c5a51f570
commit 89cd9d23e9
1 changed files with 17 additions and 15 deletions
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32
drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c
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@ -1161,21 +1161,17 @@ static int create_queue_cpsch(struct device_queue_manager *dqm, struct queue *q,
int retval;
struct mqd_manager *mqd_mgr;
retval = 0;
dqm_lock(dqm);
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_unlock;
goto out;
}
if (q->properties.type == KFD_QUEUE_TYPE_SDMA) {
retval = allocate_sdma_queue(dqm, &q->sdma_id);
if (retval)
goto out_unlock;
goto out;
q->properties.sdma_queue_id =
q->sdma_id / get_num_sdma_engines(dqm);
q->properties.sdma_engine_id =
@ -1189,6 +1185,9 @@ static int create_queue_cpsch(struct device_queue_manager *dqm, struct queue *q,
if (retval)
goto out_deallocate_sdma_queue;
/* Do init_mqd before dqm_lock(dqm) to avoid circular locking order:
* lock(dqm) -> bo::reserve
*/
mqd_mgr = dqm->ops.get_mqd_manager(dqm,
get_mqd_type_from_queue_type(q->properties.type));
@ -1196,6 +1195,7 @@ static int create_queue_cpsch(struct device_queue_manager *dqm, struct queue *q,
retval = -ENOMEM;
goto out_deallocate_doorbell;
}
/*
* Eviction state logic: we only mark active queues as evicted
* to avoid the overhead of restoring inactive queues later
@ -1204,9 +1204,7 @@ static int create_queue_cpsch(struct device_queue_manager *dqm, struct queue *q,
q->properties.is_evicted = (q->properties.queue_size > 0 &&
q->properties.queue_percent > 0 &&
q->properties.queue_address != 0);
dqm->asic_ops.init_sdma_vm(dqm, q, qpd);
q->properties.tba_addr = qpd->tba_addr;
q->properties.tma_addr = qpd->tma_addr;
retval = mqd_mgr->init_mqd(mqd_mgr, &q->mqd, &q->mqd_mem_obj,
@ -1214,6 +1212,8 @@ static int create_queue_cpsch(struct device_queue_manager *dqm, struct queue *q,
if (retval)
goto out_deallocate_doorbell;
dqm_lock(dqm);
list_add(&q->list, &qpd->queues_list);
qpd->queue_count++;
if (q->properties.is_active) {
@ -1241,9 +1241,7 @@ static int create_queue_cpsch(struct device_queue_manager *dqm, struct queue *q,
out_deallocate_sdma_queue:
if (q->properties.type == KFD_QUEUE_TYPE_SDMA)
deallocate_sdma_queue(dqm, q->sdma_id);
out_unlock:
dqm_unlock(dqm);
out:
return retval;
}
@ -1406,8 +1404,6 @@ static int destroy_queue_cpsch(struct device_queue_manager *dqm,
qpd->reset_wavefronts = true;
}
mqd_mgr->uninit_mqd(mqd_mgr, q->mqd, q->mqd_mem_obj);
/*
* Unconditionally decrement this counter, regardless of the queue's
* type
@ -1418,6 +1414,9 @@ static int destroy_queue_cpsch(struct device_queue_manager *dqm,
dqm_unlock(dqm);
/* Do uninit_mqd after dqm_unlock(dqm) to avoid circular locking */
mqd_mgr->uninit_mqd(mqd_mgr, q->mqd, q->mqd_mem_obj);
return retval;
failed:
@ -1641,7 +1640,11 @@ static int process_termination_cpsch(struct device_queue_manager *dqm,
qpd->reset_wavefronts = false;
}
/* lastly, free mqd resources */
dqm_unlock(dqm);
/* Lastly, free mqd resources.
* Do uninit_mqd() after dqm_unlock to avoid circular locking.
*/
list_for_each_entry_safe(q, next, &qpd->queues_list, list) {
mqd_mgr = dqm->ops.get_mqd_manager(dqm,
get_mqd_type_from_queue_type(q->properties.type));
@ -1655,7 +1658,6 @@ static int process_termination_cpsch(struct device_queue_manager *dqm,
}
out:
dqm_unlock(dqm);
return retval;
}