[PATCH v3 1/4] drm/ttm: Create pinned list

[Christian König]

Am 30.08.21 um 16:16 schrieb Andrey Grodzovsky:
>
> On 2021-08-30 4:58 a.m., Christian König wrote:
>> Am 27.08.21 um 22:39 schrieb Andrey Grodzovsky:
>>> This list will be used to capture all non VRAM BOs not
>>> on LRU so when device is hot unplugged we can iterate
>>> the list and unmap DMA mappings before device is removed.
>>>
>>> v2: Reanme function to ttm_bo_move_to_pinned
>>> v3: Move the pinned list to ttm device
>>
>> As far as I can see there is not list_del() remaining. So this won't 
>> work correctly.
>
>
> It's in ttm_bo_release, there was no code change there hence it's not 
> captured in the patch.

Ah! So you keep the logic as is there. Sorry totally missed that.

In this case the patch is Reviewed-by: Christian König 
<christian.koenig at amd.com>

Can you push this to drm-misc-next?

Thanks,
Christian.

>
> Andrey
>
>
>>
>> I suggest to rather rebase on top of the stuff I'm working on for a 
>> while to move the LRU into the resource instead.
>>
>> Just send out the latest patch set of this with you in CC.
>>
>> Christian.
>>
>>>
>>> Signed-off-by: Andrey Grodzovsky <andrey.grodzovsky at amd.com>
>>> Suggested-by: Christian König <christian.koenig at amd.com>
>>> ---
>>>   drivers/gpu/drm/ttm/ttm_bo.c     | 18 ++++++++++++++----
>>>   drivers/gpu/drm/ttm/ttm_device.c |  1 +
>>>   include/drm/ttm/ttm_device.h     |  1 +
>>>   3 files changed, 16 insertions(+), 4 deletions(-)
>>>
>>> diff --git a/drivers/gpu/drm/ttm/ttm_bo.c 
>>> b/drivers/gpu/drm/ttm/ttm_bo.c
>>> index 1b950b45cf4b..1fedd0eb67ba 100644
>>> --- a/drivers/gpu/drm/ttm/ttm_bo.c
>>> +++ b/drivers/gpu/drm/ttm/ttm_bo.c
>>> @@ -69,7 +69,17 @@ static void ttm_bo_mem_space_debug(struct 
>>> ttm_buffer_object *bo,
>>>       }
>>>   }
>>>   -static void ttm_bo_del_from_lru(struct ttm_buffer_object *bo)
>>> +static inline void ttm_bo_move_to_pinned(struct ttm_buffer_object *bo)
>>> +{
>>> +    struct ttm_device *bdev = bo->bdev;
>>> +
>>> +    list_move_tail(&bo->lru, &bdev->pinned);
>>> +
>>> +    if (bdev->funcs->del_from_lru_notify)
>>> +        bdev->funcs->del_from_lru_notify(bo);
>>> +}
>>> +
>>> +static inline void ttm_bo_del_from_lru(struct ttm_buffer_object *bo)
>>>   {
>>>       struct ttm_device *bdev = bo->bdev;
>>>   @@ -98,7 +108,7 @@ void ttm_bo_move_to_lru_tail(struct 
>>> ttm_buffer_object *bo,
>>>           dma_resv_assert_held(bo->base.resv);
>>>         if (bo->pin_count) {
>>> -        ttm_bo_del_from_lru(bo);
>>> +        ttm_bo_move_to_pinned(bo);
>>>           return;
>>>       }
>>>   @@ -339,7 +349,7 @@ static int ttm_bo_cleanup_refs(struct 
>>> ttm_buffer_object *bo,
>>>           return ret;
>>>       }
>>>   -    ttm_bo_del_from_lru(bo);
>>> +    ttm_bo_move_to_pinned(bo);
>>>       list_del_init(&bo->ddestroy);
>>>       spin_unlock(&bo->bdev->lru_lock);
>>>       ttm_bo_cleanup_memtype_use(bo);
>>> @@ -1154,7 +1164,7 @@ int ttm_bo_swapout(struct ttm_buffer_object 
>>> *bo, struct ttm_operation_ctx *ctx,
>>>           return 0;
>>>       }
>>>   -    ttm_bo_del_from_lru(bo);
>>> +    ttm_bo_move_to_pinned(bo);
>>>       /* TODO: Cleanup the locking */
>>>       spin_unlock(&bo->bdev->lru_lock);
>>>   diff --git a/drivers/gpu/drm/ttm/ttm_device.c 
>>> b/drivers/gpu/drm/ttm/ttm_device.c
>>> index 5f31acec3ad7..530a9c36be37 100644
>>> --- a/drivers/gpu/drm/ttm/ttm_device.c
>>> +++ b/drivers/gpu/drm/ttm/ttm_device.c
>>> @@ -208,6 +208,7 @@ int ttm_device_init(struct ttm_device *bdev, 
>>> struct ttm_device_funcs *funcs,
>>>       INIT_DELAYED_WORK(&bdev->wq, ttm_device_delayed_workqueue);
>>>       spin_lock_init(&bdev->lru_lock);
>>>       INIT_LIST_HEAD(&bdev->ddestroy);
>>> +    INIT_LIST_HEAD(&bdev->pinned);
>>>       bdev->dev_mapping = mapping;
>>>       mutex_lock(&ttm_global_mutex);
>>>       list_add_tail(&bdev->device_list, &glob->device_list);
>>> diff --git a/include/drm/ttm/ttm_device.h 
>>> b/include/drm/ttm/ttm_device.h
>>> index cd592f8e941b..03fb44d061e0 100644
>>> --- a/include/drm/ttm/ttm_device.h
>>> +++ b/include/drm/ttm/ttm_device.h
>>> @@ -265,6 +265,7 @@ struct ttm_device {
>>>        */
>>>       spinlock_t lru_lock;
>>>       struct list_head ddestroy;
>>> +    struct list_head pinned;
>>>         /*
>>>        * Protected by load / firstopen / lastclose /unload sync.
>>