Re: [PATCH 2/3] firmware: arm_scmi: Fix freq/power truncation in the perf protocol

Sibi Sankar
2023-11-30T19:33:05Z

On 11/30/23 21:55, Cristian Marussi wrote:
> On Thu, Nov 30, 2023 at 01:56:56PM +0000, Sudeep Holla wrote:
>> On Thu, Nov 30, 2023 at 12:49:42PM +0000, Cristian Marussi wrote:
>>> On Thu, Nov 30, 2023 at 12:05:06PM +0000, Sudeep Holla wrote:
>>>> On Wed, Nov 29, 2023 at 12:27:47PM +0530, Sibi Sankar wrote:
>>>>> Fix frequency and power truncation seen in the performance protocol by
>>>>> casting it with the correct type.
>>>>>
>>>>
>>>> While I always remembered to handle this when reviewing the spec, seem to
>>>> have forgotten when it came to handling in the implementation :(. Thanks
>>>> for spotting this.
>>>>
>>>> However I don't like the ugly type casting. I think we can do better. Also
>>>> looking at the code around the recently added level index mode, I think we
>>>> can simplify things like below patch.
>>>>
>>>> Cristian,
>>>> What do you think ?
>>>>
>>>
>>> Hi
>>>
>>> the cleanup seems nice in general to compact the mult_factor multipliers
>>> in one place, and regarding addressing the problem of truncation without
>>> the need of the explicit casting, should not be enough to change to
>>> additionally also change mult_factor to be an u64 ?
>>>
>>
>> I started exactly with that, but when I completed the patch, there was no
>> explicit need for it, so dropped it again. I can bump mult_factor to be
>> u64 but do you see any other place that would need it apart from having
>> single statement that does multiplication and assignment ? I am exploiting
>> the conditional based on level_indexing_mode here but I agree it may help
>> in backporting if I make mult_factor u64.
>>
>
> Ah right
>
> freq *= dom->multi_fact;
>
> does the trick..but cannot this by itself (under unplausibl conds)
> overflow and does not fit into a u32 mult_factor ?
>
> dom_info->mult_factor =
> (dom_info->sustained_freq_khz * 1000UL)

wouldn't having the 1000UL ensure that we don't truncate though?
Anyway will drop the patch when I re-spin the series.

-Sibi

> / dom_info->sustained_perf_level;
>
>
> Thanks,
> Cristian