Commit e034a0d9 authored by Philip Yang's avatar Philip Yang Committed by Alex Deucher

drm/amdgpu: Drop eviction lock when allocating PT BO

Re-take the eviction lock immediately again after the allocation is
completed, to fix circular locking warning with drm_buddy allocator.

Move amdgpu_vm_eviction_lock/unlock/trylock to amdgpu_vm.h as they are
called from multiple files.
Signed-off-by: default avatarPhilip Yang <Philip.Yang@amd.com>
Reviewed-by: default avatarChristian König <christian.koenig@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent 64f65135
......@@ -143,32 +143,6 @@ int amdgpu_vm_set_pasid(struct amdgpu_device *adev, struct amdgpu_vm *vm,
return 0;
}
/*
* vm eviction_lock can be taken in MMU notifiers. Make sure no reclaim-FS
* happens while holding this lock anywhere to prevent deadlocks when
* an MMU notifier runs in reclaim-FS context.
*/
static inline void amdgpu_vm_eviction_lock(struct amdgpu_vm *vm)
{
mutex_lock(&vm->eviction_lock);
vm->saved_flags = memalloc_noreclaim_save();
}
static inline int amdgpu_vm_eviction_trylock(struct amdgpu_vm *vm)
{
if (mutex_trylock(&vm->eviction_lock)) {
vm->saved_flags = memalloc_noreclaim_save();
return 1;
}
return 0;
}
static inline void amdgpu_vm_eviction_unlock(struct amdgpu_vm *vm)
{
memalloc_noreclaim_restore(vm->saved_flags);
mutex_unlock(&vm->eviction_lock);
}
/**
* amdgpu_vm_bo_evicted - vm_bo is evicted
*
......
......@@ -510,4 +510,30 @@ static inline uint64_t amdgpu_vm_tlb_seq(struct amdgpu_vm *vm)
return atomic64_read(&vm->tlb_seq);
}
/*
* vm eviction_lock can be taken in MMU notifiers. Make sure no reclaim-FS
* happens while holding this lock anywhere to prevent deadlocks when
* an MMU notifier runs in reclaim-FS context.
*/
static inline void amdgpu_vm_eviction_lock(struct amdgpu_vm *vm)
{
mutex_lock(&vm->eviction_lock);
vm->saved_flags = memalloc_noreclaim_save();
}
static inline bool amdgpu_vm_eviction_trylock(struct amdgpu_vm *vm)
{
if (mutex_trylock(&vm->eviction_lock)) {
vm->saved_flags = memalloc_noreclaim_save();
return true;
}
return false;
}
static inline void amdgpu_vm_eviction_unlock(struct amdgpu_vm *vm)
{
memalloc_noreclaim_restore(vm->saved_flags);
mutex_unlock(&vm->eviction_lock);
}
#endif
......@@ -597,7 +597,9 @@ static int amdgpu_vm_pt_alloc(struct amdgpu_device *adev,
if (entry->bo)
return 0;
amdgpu_vm_eviction_unlock(vm);
r = amdgpu_vm_pt_create(adev, vm, cursor->level, immediate, &pt);
amdgpu_vm_eviction_lock(vm);
if (r)
return r;
......
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