> 2020年2月19日 07:10，Kuehling, Felix <[email protected]> 写道：
>
> Hi Xinhui,
>
> Two suggestions inline. Looks good to me otherwise.
>
> On 2020-02-17 10:36 p.m., xinhui pan wrote:
>> No need to trigger eviction as the memory mapping will not be used
>> anymore.
>>
>> All pt/pd bos share same resv, hence the same shared eviction fence.
>> Everytime page table is freed, the fence will be signled and that cuases
>> kfd unexcepted evictions.
>>
>> Signed-off-by: xinhui pan <[email protected]>
>> CC: Christian König <[email protected]>
>> CC: Felix Kuehling <[email protected]>
>> CC: Alex Deucher <[email protected]>
>> ---
>> change from v4:
>> based on new ttm code.
>>
>> change from v3:
>> fix a coding error
>>
>> change from v2:
>> based on Chris' drm/ttm: rework BO delayed delete patchset.
>>
>> ---
>> ---
>> drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h | 1 +
>> .../gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c | 37 +++++++++++++++++++
>> drivers/gpu/drm/amd/amdgpu/amdgpu_object.c | 4 ++
>> 3 files changed, 42 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h
>> b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h
>> index 9e8db702d878..0ee8aae6c519 100644
>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h
>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h
>> @@ -96,6 +96,7 @@ struct amdgpu_amdkfd_fence *amdgpu_amdkfd_fence_create(u64
>> context,
>> struct mm_struct *mm);
>> bool amdkfd_fence_check_mm(struct dma_fence *f, struct mm_struct *mm);
>> struct amdgpu_amdkfd_fence *to_amdgpu_amdkfd_fence(struct dma_fence *f);
>> +int amdgpu_amdkfd_remove_fence_on_pt_pd_bos(struct amdgpu_bo *bo);
>> struct amdkfd_process_info {
>> /* List head of all VMs that belong to a KFD process */
>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
>> b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
>> index ef721cb65868..6aa20aa82bd3 100644
>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
>> @@ -276,6 +276,41 @@ static int amdgpu_amdkfd_remove_eviction_fence(struct
>> amdgpu_bo *bo,
>> return 0;
>> }
>> +int amdgpu_amdkfd_remove_fence_on_pt_pd_bos(struct amdgpu_bo *bo)
>> +{
>> + struct amdgpu_bo *root = bo;
>> + struct amdgpu_vm_bo_base *vm_bo;
>> + struct amdgpu_vm *vm;
>> + struct amdkfd_process_info *info;
>> + struct amdgpu_amdkfd_fence *ef;
>> + int ret;
>> +
>> + while (root->parent)
>> + root = root->parent;
>
> This should not be necessary. Every page table BO has a pointer to a vm_bo
> that has a pointer to the vm. So you don't need to find the root.
>
> This should do the trick:
>
> if (!bo->vm_bo || !bo->vm_bo->vm)
> return 0;
> vm = bo->vm_bo->vm;
>
>
well,when free page tables, it clears bo->vm_bo first then release pt/pd bo.
Also we can change the sequence like I do in V2, looks like hit some weird
issues.
>> +
>> + vm_bo = root->vm_bo;
>> + if (!vm_bo)
>> + return 0;
>> +
>> + vm = vm_bo->vm;
>> + if (!vm)
>> + return 0;
>> +
>> + info = vm->process_info;
>> + if (!info || !info->eviction_fence)
>> + return 0;
>> +
>> + ef = container_of(dma_fence_get(&info->eviction_fence->base),
>> + struct amdgpu_amdkfd_fence, base);
>> +
>> + dma_resv_lock(bo->tbo.base.resv, NULL);
>> + ret = amdgpu_amdkfd_remove_eviction_fence(bo, ef);
>> + dma_resv_unlock(bo->tbo.base.resv);
>> +
>> + dma_fence_put(&ef->base);
>> + return ret;
>> +}
>> +
>> static int amdgpu_amdkfd_bo_validate(struct amdgpu_bo *bo, uint32_t domain,
>> bool wait)
>> {
>> @@ -1045,6 +1080,8 @@ void amdgpu_amdkfd_gpuvm_destroy_cb(struct
>> amdgpu_device *adev,
>> list_del(&vm->vm_list_node);
>> mutex_unlock(&process_info->lock);
>> + vm->process_info = NULL;
>> +
>> /* Release per-process resources when last compute VM is destroyed */
>> if (!process_info->n_vms) {
>> WARN_ON(!list_empty(&process_info->kfd_bo_list));
>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
>> b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
>> index 6f60a581e3ba..16586651020f 100644
>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
>> @@ -1307,6 +1307,10 @@ void amdgpu_bo_release_notify(struct
>> ttm_buffer_object *bo)
>> if (abo->kfd_bo)
>> amdgpu_amdkfd_unreserve_memory_limit(abo);
>> + /* We only remove the fence if the resv has individualized. */
>> + if (bo->base.resv == &bo->base._resv)
>
> Should this be a WARN_ON? We expect this condition to be always true. If it's
> not, there should be a noisy warning that something is wrong.
good point.
thanks
xinhui
>
> Regards,
> Felix
>
>
>> + amdgpu_amdkfd_remove_fence_on_pt_pd_bos(abo);
>> +
>> if (bo->mem.mem_type != TTM_PL_VRAM || !bo->mem.mm_node ||
>> !(abo->flags & AMDGPU_GEM_CREATE_VRAM_WIPE_ON_RELEASE))
>> return;
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