Re: [PATCH] drm/ttm: Support 52-bit PAs in ttm_place

["Kuehling, Felix" <felix.kuehling@amd.com>]

On 2026-05-13 03:08, Christian König wrote:
>
> On 5/13/26 00:31, Felix Kuehling wrote:
>> fpfn and lpfn in struct ttm_place are 32-bit page numbers. With 4KB page
>> size this can support up to 44-bit physical addressing. Grow these to
>> unsigned long to support larger physical addresses.
>>
>> Signed-off-by: Felix Kuehling <felix.kuehling@amd.com>
>> ---
>>   include/drm/ttm/ttm_placement.h | 4 ++--
>>   1 file changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/include/drm/ttm/ttm_placement.h b/include/drm/ttm/ttm_placement.h
>> index b510a4812609..3e88869c0f58 100644
>> --- a/include/drm/ttm/ttm_placement.h
>> +++ b/include/drm/ttm/ttm_placement.h
>> @@ -81,8 +81,8 @@
>>    * Structure indicating a possible place to put an object.
>>    */
>>   struct ttm_place {
>> -	unsigned	fpfn;
>> -	unsigned	lpfn;
>> +	unsigned long	fpfn;
>> +	unsigned long	lpfn;
> That should be uint64_t instead, long is CPU architecture dependent and we clearly don't want that in TTM.
>
> But apart from that looks reasonable to me.

Thanks. I sent out v2. What's the best branch for getting this change 
upstream? We'll need it on our NPI branch in the interim.

Regards,
   Felix


>
> Regards,
> Christian.
>
>>   	uint32_t	mem_type;
>>   	uint32_t	flags;
>>   };