Quoting Antonio Argenziano (2018-04-23 16:37:17)
>
>
> On 23/04/18 06:43, Chris Wilson wrote:
> > In the existing ABI, each engine operates its own timeline
> > (fence.context) and so should execute independently of any other. If we
> > install a blocker on all other engines, that should not affect execution
> > on the local engine.
> >
> > Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
> > Cc: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
>
> > +static void independent(int fd, unsigned int engine)
> > +{
> > + IGT_CORK_HANDLE(cork);
> > + uint32_t scratch, plug, batch;
> > + igt_spin_t *spin = NULL;
> > + unsigned int other;
> > + uint32_t *ptr;
> > +
> > + igt_require(engine != 0);
> > +
> > + scratch = gem_create(fd, 4096);
> > + plug = igt_cork_plug(&cork, fd);
> > +
> > + /* Check that we can submit to engine while all others are blocked */
> > + for_each_physical_engine(fd, other) {
> > + if (other == engine)
> > + continue;
> > +
> > + if (spin == NULL) {
> > + spin = __igt_spin_batch_new(fd, 0, other, 0);
> > + } else {
> > + struct drm_i915_gem_exec_object2 obj = {
> > + .handle = spin->handle,
> > + };
> > + struct drm_i915_gem_execbuffer2 eb = {
> > + .buffer_count = 1,
> > + .buffers_ptr = to_user_pointer(&obj),
> > + .flags = other,
> > + };
> > + gem_execbuf(fd, &eb);
> > + }
> > +
> > + store_dword(fd, 0, other, scratch, 0, other, plug, 0);
> > + }
> > + igt_require(spin);
> > +
> > + /* Same priority, but different timeline (as different engine) */
> > + batch = __store_dword(fd, 0, engine, scratch, 0, engine, plug, 0);
>
> It would be interesting to check that priority scheduling/preemption is
> still happening on the free engine.
It's being run on machines without scheduling as well. Reordering tests
are later; not sure if I care about reordering while blocking, that's an
entirely different set of tests being worked on for queues.
-Chris
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