Nouveau - Sep 2025 - [PATCH v2 02/10] gpu: nova-core: Create initial Gsp

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?


thanks,
-- 
John Hubbard

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
on CONFIG_64BIT then that should be fine:

Reviewed-by: Lyude Paul <lyude at redhat.com>
> 
> 
> thanks,
-- 
Cheers,
 Lyude Paul (she/her)
 Software Engineer at Red Hat

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