Re: [PATCH v3 27/33] gpu: nova-core: switch to the r000 GSP firmware

[John Hubbard]

On 9/18/26 3:48 PM, Timur Tabi wrote:
> On Thu, 2026-09-17 at 18:07 -0700, John Hubbard wrote:
>>
>> --- a/drivers/gpu/nova-core/fb/hal/gb100.rs
>> +++ b/drivers/gpu/nova-core/fb/hal/gb100.rs
>> @@ -79,10 +79,28 @@ fn write_sysmem_flush_page_gb100(hshub0: Mmio<'_, regs::Hshub0Registers>, addr:
>>      hshub0.write_reg(regs::NV_PFB_HSHUB_EG_PCIE_FLUSH_SYSMEM_ADDR_LO::zeroed().with_adr(addr_lo));
>>  }
>>  
>> -// This PMU reservation size is r570-specific.
>> +/// PMU backing store.
>> +const PMU_BACKING_STORE_SIZE: usize = 9 * SZ_1M;
> 
> I don't see this comment or value removed/changed in this patchset, so is it really 570-
> specific?

Yes, it was r570-specific, and this patch is where it changes: the
hunk removes the comment and replaces the value.

In 570.144 the PMU region is:

    * 8 MiB of backing store
    * 16 MiB of surfaces
    * 4 KiB of miscellaneous memory
    * all aligned to 128 KiB. 

In 615.71.09 the backing store is 9 MiB and the surfaces are 16 MiB + 256 KiB.

(v4 adds the before and after sizes to the commit message.)

thanks,
-- 
John Hubbard