[PATCH v4 01/18] drm/sched: Split drm_sched_job_init

[Emma Anholt]

On Mon, Jul 12, 2021 at 1:01 PM Daniel Vetter <daniel.vetter at ffwll.ch> wrote:
>
> This is a very confusingly named function, because not just does it
> init an object, it arms it and provides a point of no return for
> pushing a job into the scheduler. It would be nice if that's a bit
> clearer in the interface.
>
> But the real reason is that I want to push the dependency tracking
> helpers into the scheduler code, and that means drm_sched_job_init
> must be called a lot earlier, without arming the job.
>
> v2:
> - don't change .gitignore (Steven)
> - don't forget v3d (Emma)
>
> v3: Emma noticed that I leak the memory allocated in
> drm_sched_job_init if we bail out before the point of no return in
> subsequent driver patches. To be able to fix this change
> drm_sched_job_cleanup() so it can handle being called both before and
> after drm_sched_job_arm().
>
> Also improve the kerneldoc for this.
>
> v4:
> - Fix the drm_sched_job_cleanup logic, I inverted the booleans, as
>   usual (Melissa)
>
> - Christian pointed out that drm_sched_entity_select_rq() also needs
>   to be moved into drm_sched_job_arm, which made me realize that the
>   job->id definitely needs to be moved too.
>
>   Shuffle things to fit between job_init and job_arm.
>
> v5:
> Reshuffle the split between init/arm once more, amdgpu abuses
> drm_sched.ready to signal gpu reset failures. Also document this
> somewhat. (Christian)

Ack from me for the changes I was Cced on.