mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-28 11:18:45 +07:00
drm/amdkfd: don't use dqm lock during device reset/suspend/resume
If device reset/suspend/resume failed for some reason, dqm lock is hold forever and this causes deadlock. Below is a kernel backtrace when application open kfd after suspend/resume failed. Instead of holding dqm lock in pre_reset and releasing dqm lock in post_reset, add dqm->sched_running flag which is modified in dqm->ops.start and dqm->ops.stop. The flag doesn't need lock protection because write/read are all inside dqm lock. For HWS case, map_queues_cpsch and unmap_queues_cpsch checks sched_running flag before sending the updated runlist. v2: For no-HWS case, when device is stopped, don't call load/destroy_mqd for eviction, restore and create queue, and avoid debugfs dump hdqs. Backtrace of dqm lock deadlock: [Thu Oct 17 16:43:37 2019] INFO: task rocminfo:3024 blocked for more than 120 seconds. [Thu Oct 17 16:43:37 2019] Not tainted 5.0.0-rc1-kfd-compute-rocm-dkms-no-npi-1131 #1 [Thu Oct 17 16:43:37 2019] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [Thu Oct 17 16:43:37 2019] rocminfo D 0 3024 2947 0x80000000 [Thu Oct 17 16:43:37 2019] Call Trace: [Thu Oct 17 16:43:37 2019] ? __schedule+0x3d9/0x8a0 [Thu Oct 17 16:43:37 2019] schedule+0x32/0x70 [Thu Oct 17 16:43:37 2019] schedule_preempt_disabled+0xa/0x10 [Thu Oct 17 16:43:37 2019] __mutex_lock.isra.9+0x1e3/0x4e0 [Thu Oct 17 16:43:37 2019] ? __call_srcu+0x264/0x3b0 [Thu Oct 17 16:43:37 2019] ? process_termination_cpsch+0x24/0x2f0 [amdgpu] [Thu Oct 17 16:43:37 2019] process_termination_cpsch+0x24/0x2f0 [amdgpu] [Thu Oct 17 16:43:37 2019] kfd_process_dequeue_from_all_devices+0x42/0x60 [amdgpu] [Thu Oct 17 16:43:37 2019] kfd_process_notifier_release+0x1be/0x220 [amdgpu] [Thu Oct 17 16:43:37 2019] __mmu_notifier_release+0x3e/0xc0 [Thu Oct 17 16:43:37 2019] exit_mmap+0x160/0x1a0 [Thu Oct 17 16:43:37 2019] ? __handle_mm_fault+0xba3/0x1200 [Thu Oct 17 16:43:37 2019] ? exit_robust_list+0x5a/0x110 [Thu Oct 17 16:43:37 2019] mmput+0x4a/0x120 [Thu Oct 17 16:43:37 2019] do_exit+0x284/0xb20 [Thu Oct 17 16:43:37 2019] ? handle_mm_fault+0xfa/0x200 [Thu Oct 17 16:43:37 2019] do_group_exit+0x3a/0xa0 [Thu Oct 17 16:43:37 2019] __x64_sys_exit_group+0x14/0x20 [Thu Oct 17 16:43:37 2019] do_syscall_64+0x4f/0x100 [Thu Oct 17 16:43:37 2019] entry_SYSCALL_64_after_hwframe+0x44/0xa9 Suggested-by: Felix Kuehling <Felix.Kuehling@amd.com> Signed-off-by: Philip Yang <Philip.Yang@amd.com> Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
parent
80df905da7
commit
2c99a547bc
@ -730,9 +730,6 @@ int kgd2kfd_pre_reset(struct kfd_dev *kfd)
|
||||
return 0;
|
||||
kgd2kfd_suspend(kfd);
|
||||
|
||||
/* hold dqm->lock to prevent further execution*/
|
||||
dqm_lock(kfd->dqm);
|
||||
|
||||
kfd_signal_reset_event(kfd);
|
||||
return 0;
|
||||
}
|
||||
@ -750,8 +747,6 @@ int kgd2kfd_post_reset(struct kfd_dev *kfd)
|
||||
if (!kfd->init_complete)
|
||||
return 0;
|
||||
|
||||
dqm_unlock(kfd->dqm);
|
||||
|
||||
ret = kfd_resume(kfd);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
@ -340,6 +340,10 @@ static int create_queue_nocpsch(struct device_queue_manager *dqm,
|
||||
mqd_mgr->init_mqd(mqd_mgr, &q->mqd, q->mqd_mem_obj,
|
||||
&q->gart_mqd_addr, &q->properties);
|
||||
if (q->properties.is_active) {
|
||||
if (!dqm->sched_running) {
|
||||
WARN_ONCE(1, "Load non-HWS mqd while stopped\n");
|
||||
goto add_queue_to_list;
|
||||
}
|
||||
|
||||
if (WARN(q->process->mm != current->mm,
|
||||
"should only run in user thread"))
|
||||
@ -351,6 +355,7 @@ static int create_queue_nocpsch(struct device_queue_manager *dqm,
|
||||
goto out_free_mqd;
|
||||
}
|
||||
|
||||
add_queue_to_list:
|
||||
list_add(&q->list, &qpd->queues_list);
|
||||
qpd->queue_count++;
|
||||
if (q->properties.is_active)
|
||||
@ -458,6 +463,11 @@ static int destroy_queue_nocpsch_locked(struct device_queue_manager *dqm,
|
||||
|
||||
deallocate_doorbell(qpd, q);
|
||||
|
||||
if (!dqm->sched_running) {
|
||||
WARN_ONCE(1, "Destroy non-HWS queue while stopped\n");
|
||||
return 0;
|
||||
}
|
||||
|
||||
retval = mqd_mgr->destroy_mqd(mqd_mgr, q->mqd,
|
||||
KFD_PREEMPT_TYPE_WAVEFRONT_RESET,
|
||||
KFD_UNMAP_LATENCY_MS,
|
||||
@ -533,6 +543,12 @@ static int update_queue(struct device_queue_manager *dqm, struct queue *q)
|
||||
(q->properties.type == KFD_QUEUE_TYPE_COMPUTE ||
|
||||
q->properties.type == KFD_QUEUE_TYPE_SDMA ||
|
||||
q->properties.type == KFD_QUEUE_TYPE_SDMA_XGMI)) {
|
||||
|
||||
if (!dqm->sched_running) {
|
||||
WARN_ONCE(1, "Update non-HWS queue while stopped\n");
|
||||
goto out_unlock;
|
||||
}
|
||||
|
||||
retval = mqd_mgr->destroy_mqd(mqd_mgr, q->mqd,
|
||||
KFD_PREEMPT_TYPE_WAVEFRONT_DRAIN,
|
||||
KFD_UNMAP_LATENCY_MS, q->pipe, q->queue);
|
||||
@ -602,6 +618,11 @@ static int evict_process_queues_nocpsch(struct device_queue_manager *dqm,
|
||||
mqd_mgr = dqm->mqd_mgrs[get_mqd_type_from_queue_type(
|
||||
q->properties.type)];
|
||||
q->properties.is_active = false;
|
||||
dqm->queue_count--;
|
||||
|
||||
if (WARN_ONCE(!dqm->sched_running, "Evict when stopped\n"))
|
||||
continue;
|
||||
|
||||
retval = mqd_mgr->destroy_mqd(mqd_mgr, q->mqd,
|
||||
KFD_PREEMPT_TYPE_WAVEFRONT_DRAIN,
|
||||
KFD_UNMAP_LATENCY_MS, q->pipe, q->queue);
|
||||
@ -610,7 +631,6 @@ static int evict_process_queues_nocpsch(struct device_queue_manager *dqm,
|
||||
* maintain a consistent eviction state
|
||||
*/
|
||||
ret = retval;
|
||||
dqm->queue_count--;
|
||||
}
|
||||
|
||||
out:
|
||||
@ -711,6 +731,11 @@ static int restore_process_queues_nocpsch(struct device_queue_manager *dqm,
|
||||
mqd_mgr = dqm->mqd_mgrs[get_mqd_type_from_queue_type(
|
||||
q->properties.type)];
|
||||
q->properties.is_active = true;
|
||||
dqm->queue_count++;
|
||||
|
||||
if (WARN_ONCE(!dqm->sched_running, "Restore when stopped\n"))
|
||||
continue;
|
||||
|
||||
retval = mqd_mgr->load_mqd(mqd_mgr, q->mqd, q->pipe,
|
||||
q->queue, &q->properties, mm);
|
||||
if (retval && !ret)
|
||||
@ -718,7 +743,6 @@ static int restore_process_queues_nocpsch(struct device_queue_manager *dqm,
|
||||
* maintain a consistent eviction state
|
||||
*/
|
||||
ret = retval;
|
||||
dqm->queue_count++;
|
||||
}
|
||||
qpd->evicted = 0;
|
||||
out:
|
||||
@ -915,7 +939,8 @@ static int start_nocpsch(struct device_queue_manager *dqm)
|
||||
|
||||
if (dqm->dev->device_info->asic_family == CHIP_HAWAII)
|
||||
return pm_init(&dqm->packets, dqm);
|
||||
|
||||
dqm->sched_running = true;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
@ -923,7 +948,8 @@ static int stop_nocpsch(struct device_queue_manager *dqm)
|
||||
{
|
||||
if (dqm->dev->device_info->asic_family == CHIP_HAWAII)
|
||||
pm_uninit(&dqm->packets);
|
||||
|
||||
dqm->sched_running = false;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
@ -1074,6 +1100,7 @@ static int start_cpsch(struct device_queue_manager *dqm)
|
||||
dqm_lock(dqm);
|
||||
/* clear hang status when driver try to start the hw scheduler */
|
||||
dqm->is_hws_hang = false;
|
||||
dqm->sched_running = true;
|
||||
execute_queues_cpsch(dqm, KFD_UNMAP_QUEUES_FILTER_DYNAMIC_QUEUES, 0);
|
||||
dqm_unlock(dqm);
|
||||
|
||||
@ -1089,6 +1116,7 @@ static int stop_cpsch(struct device_queue_manager *dqm)
|
||||
{
|
||||
dqm_lock(dqm);
|
||||
unmap_queues_cpsch(dqm, KFD_UNMAP_QUEUES_FILTER_ALL_QUEUES, 0);
|
||||
dqm->sched_running = false;
|
||||
dqm_unlock(dqm);
|
||||
|
||||
kfd_gtt_sa_free(dqm->dev, dqm->fence_mem);
|
||||
@ -1275,9 +1303,10 @@ static int map_queues_cpsch(struct device_queue_manager *dqm)
|
||||
{
|
||||
int retval;
|
||||
|
||||
if (!dqm->sched_running)
|
||||
return 0;
|
||||
if (dqm->queue_count <= 0 || dqm->processes_count <= 0)
|
||||
return 0;
|
||||
|
||||
if (dqm->active_runlist)
|
||||
return 0;
|
||||
|
||||
@ -1299,6 +1328,8 @@ static int unmap_queues_cpsch(struct device_queue_manager *dqm,
|
||||
{
|
||||
int retval = 0;
|
||||
|
||||
if (!dqm->sched_running)
|
||||
return 0;
|
||||
if (dqm->is_hws_hang)
|
||||
return -EIO;
|
||||
if (!dqm->active_runlist)
|
||||
@ -1903,6 +1934,12 @@ int dqm_debugfs_hqds(struct seq_file *m, void *data)
|
||||
int pipe, queue;
|
||||
int r = 0;
|
||||
|
||||
if (!dqm->sched_running) {
|
||||
seq_printf(m, " Device is stopped\n");
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
r = dqm->dev->kfd2kgd->hqd_dump(dqm->dev->kgd,
|
||||
KFD_CIK_HIQ_PIPE, KFD_CIK_HIQ_QUEUE,
|
||||
&dump, &n_regs);
|
||||
|
@ -201,6 +201,7 @@ struct device_queue_manager {
|
||||
bool is_hws_hang;
|
||||
struct work_struct hw_exception_work;
|
||||
struct kfd_mem_obj hiq_sdma_mqd;
|
||||
bool sched_running;
|
||||
};
|
||||
|
||||
void device_queue_manager_init_cik(
|
||||
|
Loading…
Reference in New Issue
Block a user