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drm/amdkfd: svm range restore work deadlock when process exit
kfd_process_notifier_release flush svm_range_restore_work which calls svm_range_list_lock_and_flush_work to flush deferred_list work, but if deferred_list work mmput release the last user, it will call exit_mmap -> notifier_release, it is deadlock with below backtrace. Move flush svm_range_restore_work to kfd_process_wq_release to avoid deadlock. Then svm_range_restore_work take task->mm ref to avoid mm is gone while validating and mapping ranges to GPU. Workqueue: events svm_range_deferred_list_work [amdgpu] Call Trace: wait_for_completion+0x94/0x100 __flush_work+0x12a/0x1e0 __cancel_work_timer+0x10e/0x190 cancel_delayed_work_sync+0x13/0x20 kfd_process_notifier_release+0x98/0x2a0 [amdgpu] __mmu_notifier_release+0x74/0x1f0 exit_mmap+0x170/0x200 mmput+0x5d/0x130 svm_range_deferred_list_work+0x104/0x230 [amdgpu] process_one_work+0x220/0x3c0 Signed-off-by: Philip Yang <Philip.Yang@amd.com> Reported-by: Ruili Ji <ruili.ji@amd.com> Tested-by: Ruili Ji <ruili.ji@amd.com> Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
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367c9b0f1b
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6225bb3a88
2 changed files with 9 additions and 7 deletions
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@ -1150,7 +1150,6 @@ static void kfd_process_notifier_release(struct mmu_notifier *mn,
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cancel_delayed_work_sync(&p->eviction_work);
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cancel_delayed_work_sync(&p->restore_work);
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cancel_delayed_work_sync(&p->svms.restore_work);
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mutex_lock(&p->mutex);
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@ -1643,13 +1643,14 @@ static void svm_range_restore_work(struct work_struct *work)
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pr_debug("restore svm ranges\n");
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/* kfd_process_notifier_release destroys this worker thread. So during
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* the lifetime of this thread, kfd_process and mm will be valid.
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*/
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p = container_of(svms, struct kfd_process, svms);
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mm = p->mm;
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if (!mm)
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/* Keep mm reference when svm_range_validate_and_map ranges */
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mm = get_task_mm(p->lead_thread);
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if (!mm) {
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pr_debug("svms 0x%p process mm gone\n", svms);
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return;
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}
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svm_range_list_lock_and_flush_work(svms, mm);
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mutex_lock(&svms->lock);
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@ -1703,6 +1704,7 @@ static void svm_range_restore_work(struct work_struct *work)
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out_reschedule:
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mutex_unlock(&svms->lock);
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mmap_write_unlock(mm);
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mmput(mm);
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/* If validation failed, reschedule another attempt */
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if (evicted_ranges) {
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@ -2840,6 +2842,8 @@ void svm_range_list_fini(struct kfd_process *p)
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pr_debug("pasid 0x%x svms 0x%p\n", p->pasid, &p->svms);
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cancel_delayed_work_sync(&p->svms.restore_work);
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/* Ensure list work is finished before process is destroyed */
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flush_work(&p->svms.deferred_list_work);
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@ -2850,7 +2854,6 @@ void svm_range_list_fini(struct kfd_process *p)
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atomic_inc(&p->svms.drain_pagefaults);
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svm_range_drain_retry_fault(&p->svms);
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list_for_each_entry_safe(prange, next, &p->svms.list, list) {
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svm_range_unlink(prange);
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svm_range_remove_notifier(prange);
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