Re: [PATCH v8 1/5] drm/panthor: introduce job cycle and timestamp accounting

[Steven Price]

On 02/10/2024 09:38, Boris Brezillon wrote:
> On Tue, 24 Sep 2024 00:06:21 +0100
> Adrián Larumbe <adrian.larumbe@xxxxxxxxxxxxx> wrote:
> 
>> +static u32 calc_profiling_ringbuf_num_slots(struct panthor_device *ptdev,
>> +				       u32 cs_ringbuf_size)
>> +{
>> +	u32 min_profiled_job_instrs = U32_MAX;
>> +	u32 last_flag = fls(PANTHOR_DEVICE_PROFILING_ALL);
>> +
>> +	/*
>> +	 * We want to calculate the minimum size of a profiled job's CS,
>> +	 * because since they need additional instructions for the sampling
>> +	 * of performance metrics, they might take up further slots in
>> +	 * the queue's ringbuffer. This means we might not need as many job
>> +	 * slots for keeping track of their profiling information. What we
>> +	 * need is the maximum number of slots we should allocate to this end,
>> +	 * which matches the maximum number of profiled jobs we can place
>> +	 * simultaneously in the queue's ring buffer.
>> +	 * That has to be calculated separately for every single job profiling
>> +	 * flag, but not in the case job profiling is disabled, since unprofiled
>> +	 * jobs don't need to keep track of this at all.
>> +	 */
>> +	for (u32 i = 0; i < last_flag; i++) {
>> +		if (BIT(i) & PANTHOR_DEVICE_PROFILING_ALL)
> 
> I'll get rid of this check when applying, as suggested by Steve. Steve,
> with this modification do you want me to add your R-b?

Yes, please do.

Thanks,
Steve

> BTW, I've also fixed a bunch of checkpatch errors/warnings, so you
> might want to run checkpatch --strict next time.
> 
>> +			min_profiled_job_instrs =
>> +				min(min_profiled_job_instrs, calc_job_credits(BIT(i)));
>> +	}
>> +
>> +	return DIV_ROUND_UP(cs_ringbuf_size, min_profiled_job_instrs * sizeof(u64));
>> +}