[PATCH 1/4] drm/ttm: add TTM_PL_FLAG_TEMPORARY flag v3

[Christian König]

Thanks!

Lang can anybody from your team give as an reviewed-by/test-by on the 
amdgpu patches? I just want another pair of eyes looking over it.

If nobody else has time I will ask Nirmoy for a quick testing round.

Thanks,
Christian.

Am 07.06.21 um 14:38 schrieb Thomas Hellström (Intel):
> Sure. LGTM,
>
> Reviewed-by: Thomas Hellström <thomas.hellstrom at linux.intel.com>
>
>
> On 6/7/21 2:36 PM, Christian König wrote:
>> Thomas any comments on this?
>>
>> Is the purpose of this now clear enough?
>>
>> Thanks,
>> Christian.
>>
>> Am 01.06.21 um 14:25 schrieb Christian König:
>>> From: Lang Yu <Lang.Yu at amd.com>
>>>
>>> Sometimes drivers need to use bounce buffers to evict BOs. While 
>>> those reside
>>> in some domain they are not necessarily suitable for CS.
>>>
>>> Add a flag so that drivers can note that a bounce buffers needs to be
>>> reallocated during validation.
>>>
>>> v2: add detailed comments
>>> v3 (chk): merge commits and rework commit message
>>>
>>> Suggested-by: Christian König <christian.koenig at amd.com>
>>> Signed-off-by: Lang Yu <Lang.Yu at amd.com>
>>> Signed-off-by: Christian König <christian.koenig at amd.com>
>>> ---
>>>   drivers/gpu/drm/ttm/ttm_bo.c    | 3 +++
>>>   include/drm/ttm/ttm_placement.h | 7 +++++--
>>>   2 files changed, 8 insertions(+), 2 deletions(-)
>>>
>>> diff --git a/drivers/gpu/drm/ttm/ttm_bo.c 
>>> b/drivers/gpu/drm/ttm/ttm_bo.c
>>> index 51a94fd63bd7..6b393502198e 100644
>>> --- a/drivers/gpu/drm/ttm/ttm_bo.c
>>> +++ b/drivers/gpu/drm/ttm/ttm_bo.c
>>> @@ -929,6 +929,9 @@ static bool ttm_bo_places_compat(const struct 
>>> ttm_place *places,
>>>   {
>>>       unsigned i;
>>>   +    if (mem->placement & TTM_PL_FLAG_TEMPORARY)
>>> +        return false;
>>> +
>>>       for (i = 0; i < num_placement; i++) {
>>>           const struct ttm_place *heap = &places[i];
>>>   diff --git a/include/drm/ttm/ttm_placement.h 
>>> b/include/drm/ttm/ttm_placement.h
>>> index aa6ba4d0cf78..8995c9e4ec1b 100644
>>> --- a/include/drm/ttm/ttm_placement.h
>>> +++ b/include/drm/ttm/ttm_placement.h
>>> @@ -47,8 +47,11 @@
>>>    * top of the memory area, instead of the bottom.
>>>    */
>>>   -#define TTM_PL_FLAG_CONTIGUOUS  (1 << 19)
>>> -#define TTM_PL_FLAG_TOPDOWN     (1 << 22)
>>> +#define TTM_PL_FLAG_CONTIGUOUS  (1 << 0)
>>> +#define TTM_PL_FLAG_TOPDOWN     (1 << 1)
>>> +
>>> +/* For multihop handling */
>>> +#define TTM_PL_FLAG_TEMPORARY   (1 << 2)
>>>     /**
>>>    * struct ttm_place