Re: [PATCH v2 02/10] gpu: nova-core: Create initial Gsp

[John Hubbard <jhubbard@nvidia.com>]

On 9/24/25 2:07 PM, Lyude Paul wrote:
> On Wed, 2025-09-24 at 13:50 -0700, John Hubbard wrote:
>> On 9/24/25 1:13 PM, Lyude Paul wrote:
>>> Some comments down below
>> ...
>>>> +/// Creates a self-mapping page table for `obj` at its beginning.
>>>> +fn create_pte_array(obj: &mut CoherentAllocation<u8>) {
>>>> +    let num_pages = obj.size().div_ceil(GSP_PAGE_SIZE);
>>>
>>> Unfortunately there's a bit of a gotcha here - we can't actually use functions
>>> like div_ceil as-is, because a number of 32 bit architectures do not support
>>> u64 / u64 natively. The problem is we don't have __aeabi_uldivmod implemented
>>
>> I recall that we agreed that nova will depend upon CONFIG_64BIT.
>>
>> Does that make this point N/A?
> 
> Oh! I apologize, I must have actually missed that memo :). If we're defending

I do enjoy the "defending" stance, that somehow does feel quite
appropriate at times. :)

> on CONFIG_64BIT then that should be fine:
> 
> Reviewed-by: Lyude Paul <lyude@redhat.com>

I found the memo, here it is for future reference:

https://lore.kernel.org/all/DCHE7FOG5ONY.9SVQATXHGM9M@kernel.org/

thanks,
-- 
John Hubbard