Re: [PATCH v8 6/6] iommu/tegra-smmu: Add pagetable mappings to debugfs

[Dmitry Osipenko]

09.12.2021 23:01, Nicolin Chen пишет:
> On Thu, Dec 09, 2021 at 10:58:32PM +0300, Dmitry Osipenko wrote:
>> External email: Use caution opening links or attachments
>>
>>
>> 09.12.2021 22:54, Nicolin Chen пишет:
>>> On Thu, Dec 09, 2021 at 10:44:25PM +0300, Dmitry Osipenko wrote:
>>>> External email: Use caution opening links or attachments
>>>>
>>>>
>>>> 09.12.2021 22:24, Nicolin Chen пишет:
>>>>> On Thu, Dec 09, 2021 at 05:49:09PM +0300, Dmitry Osipenko wrote:
>>>>>> External email: Use caution opening links or attachments
>>>>>>
>>>>>>
>>>>>> 09.12.2021 10:38, Nicolin Chen пишет:
>>>>>>> +static unsigned long pd_pt_index_iova(unsigned int pd_index, unsigned int pt_index)
>>>>>>> +{
>>>>>>> +     return (pd_index & (SMMU_NUM_PDE - 1)) << SMMU_PDE_SHIFT |
>>>>>>> +            (pt_index & (SMMU_NUM_PTE - 1)) << SMMU_PTE_SHIFT;
>>>>>>> +}
>>>>>>
>>>>>> I'd change the return type to u32 here, for consistency.
>>>>>
>>>>> The whole file defines iova using "unsigned long", which I see
>>>>> as the consistency... If we change it to u32, it'd be probably
>>>>> necessary to change all iova types to u32 too... So I'd rather
>>>>> keep it "unsigned long" here. If you see a big necessity to do
>>>>> that, an additional patch would be nicer IMHO.
>>>>>
>>>>
>>>> In general IOVA is "unsigned long", of course. But in case of Tegra
>>>> SMMU, we know that is always u32.
>>>>
>>>> Alright, I see now that there are other places in the driver code that
>>>> use "unsigned long", so need to change it in this patch.
>>>
>>> I think we should do that in a separate patch that changes the iova
>>> type in the entire tegra-smmu file. I can add one in this series, if
>>> this makes you happy...
>>>
>>
>> Please keep it "unsigned long", no need for extra patches.
> 
> Oh, I guess that "so need to change it in this patch" should be
> "so (no) need to change it in this patch" then?
> 

Indeed, I missed that typo, sorry.