lkml.org 
[lkml]   [2021]   [Dec]   [9]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH v8 6/6] iommu/tegra-smmu: Add pagetable mappings to debugfs
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...

\
 
 \ /
  Last update: 2021-12-09 20:55    [W:0.050 / U:0.112 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site