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

Boris Brezillon
2024-10-02T08:38:17Z

On Tue, 24 Sep 2024 00:06:21 +0100
Adrián Larumbe <adrian.larumbe@collabora.com> 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?

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));
> +}