[PATCH] iommu/arm-smmu-v3: Fix L1 stream table index calculation for AmpereOne

[Yang Shi]

On 10/1/24 12:46 PM, Jason Gunthorpe wrote:
> On Tue, Oct 01, 2024 at 12:38:56PM -0700, Yang Shi wrote:
>>
>> On 10/1/24 12:18 PM, Jason Gunthorpe wrote:
>>> On Tue, Oct 01, 2024 at 12:09:03PM -0700, Yang Shi wrote:
>>>>> Also, there are other places doing "1 << smmu->sid_bits", e.g.
>>>>> arm_smmu_init_strtab_linear().
>>>> The disassembly shows it uses "sbfiz x21, x20, 6, 32" instead of lsl. 1UL
>>>> should be used if we want to take extra caution and don't prefer rely on
>>>> compiler.
>>> Still, we should be fixing them all if sid_bits == 32, all those
>>> shifts should be throwing a UBSAN error. It would be crazy to have a
>> OK, will cover this is v2.
> Maybe just make a little inline function to do this math and remove
> the repated open coding? Then the types can be right, etc.

Fine to me.

>
> Jason