On Mon, Jun 14, 2021 at 06:05:19PM -0700, Daniele Ceraolo Spurio wrote:
>
>
> On 6/8/2021 12:17 PM, Matthew Brost wrote:
> > The submission tasklet operates on i915_sched_engine, thus it is the
> > correct place for it.
> >
> > v3:
> > (Jason Ekstrand)
> > Change sched_engine->engine to a void* private data pointer
> > Add kernel doc
> >
> > Signed-off-by: Matthew Brost <matthew.brost@xxxxxxxxx>
> > ---
> > drivers/gpu/drm/i915/gt/intel_engine.h | 14 ---
> > drivers/gpu/drm/i915/gt/intel_engine_cs.c | 12 +--
> > drivers/gpu/drm/i915/gt/intel_engine_types.h | 5 --
> > .../drm/i915/gt/intel_execlists_submission.c | 86 ++++++++++---------
> > drivers/gpu/drm/i915/gt/mock_engine.c | 1 +
> > drivers/gpu/drm/i915/gt/selftest_execlists.c | 16 ++--
> > drivers/gpu/drm/i915/gt/selftest_hangcheck.c | 2 +-
> > drivers/gpu/drm/i915/gt/selftest_lrc.c | 6 +-
> > drivers/gpu/drm/i915/gt/selftest_reset.c | 2 +-
> > .../gpu/drm/i915/gt/uc/intel_guc_submission.c | 25 +++---
> > drivers/gpu/drm/i915/i915_scheduler.c | 1 +
> > drivers/gpu/drm/i915/i915_scheduler.h | 14 +++
> > drivers/gpu/drm/i915/i915_scheduler_types.h | 10 +++
> > 13 files changed, 101 insertions(+), 93 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/i915/gt/intel_engine.h b/drivers/gpu/drm/i915/gt/intel_engine.h
> > index a8b2174b4395..988d9688ae4d 100644
> > --- a/drivers/gpu/drm/i915/gt/intel_engine.h
> > +++ b/drivers/gpu/drm/i915/gt/intel_engine.h
> > @@ -123,20 +123,6 @@ execlists_active(const struct intel_engine_execlists *execlists)
> > return active;
> > }
> > -static inline void
> > -execlists_active_lock_bh(struct intel_engine_execlists *execlists)
> > -{
> > - local_bh_disable(); /* prevent local softirq and lock recursion */
> > - tasklet_lock(&execlists->tasklet);
> > -}
> > -
> > -static inline void
> > -execlists_active_unlock_bh(struct intel_engine_execlists *execlists)
> > -{
> > - tasklet_unlock(&execlists->tasklet);
> > - local_bh_enable(); /* restore softirq, and kick ksoftirqd! */
> > -}
> > -
> > struct i915_request *
> > execlists_unwind_incomplete_requests(struct intel_engine_execlists *execlists);
> > diff --git a/drivers/gpu/drm/i915/gt/intel_engine_cs.c b/drivers/gpu/drm/i915/gt/intel_engine_cs.c
> > index 7ff2640aa74a..67939ee0d68f 100644
> > --- a/drivers/gpu/drm/i915/gt/intel_engine_cs.c
> > +++ b/drivers/gpu/drm/i915/gt/intel_engine_cs.c
> > @@ -713,6 +713,7 @@ static int engine_setup_common(struct intel_engine_cs *engine)
> > err = -ENOMEM;
> > goto err_sched_engine;
> > }
> > + engine->sched_engine->private_data = engine;
>
> Given that the private_data is back-end specific, IMO it should be set in
> one of the back-end functions, like set_default_submission().
>
That likely works.
> > err = intel_engine_init_cmd_parser(engine);
> > if (err)
> > @@ -937,7 +938,6 @@ int intel_engines_init(struct intel_gt *gt)
> > void intel_engine_cleanup_common(struct intel_engine_cs *engine)
> > {
> > GEM_BUG_ON(!list_empty(&engine->sched_engine->requests));
> > - tasklet_kill(&engine->execlists.tasklet); /* flush the callback */
> > i915_sched_engine_put(engine->sched_engine);
> > intel_breadcrumbs_free(engine->breadcrumbs);
> > @@ -1223,7 +1223,7 @@ static bool ring_is_idle(struct intel_engine_cs *engine)
> > void __intel_engine_flush_submission(struct intel_engine_cs *engine, bool sync)
> > {
> > - struct tasklet_struct *t = &engine->execlists.tasklet;
> > + struct tasklet_struct *t = &engine->sched_engine->tasklet;
> > if (!t->callback)
> > return;
> > @@ -1484,8 +1484,8 @@ static void intel_engine_print_registers(struct intel_engine_cs *engine,
> > drm_printf(m, "\tExeclist tasklet queued? %s (%s), preempt? %s, timeslice? %s\n",
> > yesno(test_bit(TASKLET_STATE_SCHED,
> > - &engine->execlists.tasklet.state)),
> > - enableddisabled(!atomic_read(&engine->execlists.tasklet.count)),
> > + &engine->sched_engine->tasklet.state)),
> > + enableddisabled(!atomic_read(&engine->sched_engine->tasklet.count)),
> > repr_timer(&engine->execlists.preempt),
> > repr_timer(&engine->execlists.timer));
> > @@ -1509,7 +1509,7 @@ static void intel_engine_print_registers(struct intel_engine_cs *engine,
> > idx, hws[idx * 2], hws[idx * 2 + 1]);
> > }
> > - execlists_active_lock_bh(execlists);
> > + i915_sched_engine_active_lock_bh(engine->sched_engine);
> > rcu_read_lock();
> > for (port = execlists->active; (rq = *port); port++) {
> > char hdr[160];
> > @@ -1540,7 +1540,7 @@ static void intel_engine_print_registers(struct intel_engine_cs *engine,
> > i915_request_show(m, rq, hdr, 0);
> > }
> > rcu_read_unlock();
> > - execlists_active_unlock_bh(execlists);
> > + i915_sched_engine_active_unlock_bh(engine->sched_engine);
> > } else if (GRAPHICS_VER(dev_priv) > 6) {
> > drm_printf(m, "\tPP_DIR_BASE: 0x%08x\n",
> > ENGINE_READ(engine, RING_PP_DIR_BASE));
> > diff --git a/drivers/gpu/drm/i915/gt/intel_engine_types.h b/drivers/gpu/drm/i915/gt/intel_engine_types.h
> > index 0bb65c57d274..5b91068ab277 100644
> > --- a/drivers/gpu/drm/i915/gt/intel_engine_types.h
> > +++ b/drivers/gpu/drm/i915/gt/intel_engine_types.h
> > @@ -138,11 +138,6 @@ struct st_preempt_hang {
> > * driver and the hardware state for execlist mode of submission.
> > */
> > struct intel_engine_execlists {
> > - /**
> > - * @tasklet: softirq tasklet for bottom handler
> > - */
> > - struct tasklet_struct tasklet;
> > -
> > /**
> > * @timer: kick the current context if its timeslice expires
> > */
> > diff --git a/drivers/gpu/drm/i915/gt/intel_execlists_submission.c b/drivers/gpu/drm/i915/gt/intel_execlists_submission.c
> > index ffad4d98cec0..79b40a96937c 100644
> > --- a/drivers/gpu/drm/i915/gt/intel_execlists_submission.c
> > +++ b/drivers/gpu/drm/i915/gt/intel_execlists_submission.c
> > @@ -570,7 +570,7 @@ static void kick_siblings(struct i915_request *rq, struct intel_context *ce)
> > resubmit_virtual_request(rq, ve);
> > if (READ_ONCE(ve->request))
> > - tasklet_hi_schedule(&ve->base.execlists.tasklet);
> > + tasklet_hi_schedule(&ve->base.sched_engine->tasklet);
> > }
> > static void __execlists_schedule_out(struct i915_request * const rq,
> > @@ -739,9 +739,9 @@ trace_ports(const struct intel_engine_execlists *execlists,
> > }
> > static bool
> > -reset_in_progress(const struct intel_engine_execlists *execlists)
> > +reset_in_progress(const struct intel_engine_cs *engine)
> > {
> > - return unlikely(!__tasklet_is_enabled(&execlists->tasklet));
> > + return unlikely(!__tasklet_is_enabled(&engine->sched_engine->tasklet));
> > }
> > static __maybe_unused noinline bool
> > @@ -757,7 +757,7 @@ assert_pending_valid(const struct intel_engine_execlists *execlists,
> > trace_ports(execlists, msg, execlists->pending);
> > /* We may be messing around with the lists during reset, lalala */
> > - if (reset_in_progress(execlists))
> > + if (reset_in_progress(engine))
> > return true;
> > if (!execlists->pending[0]) {
> > @@ -1190,7 +1190,7 @@ static void start_timeslice(struct intel_engine_cs *engine)
> > * its timeslice, so recheck.
> > */
> > if (!timer_pending(&el->timer))
> > - tasklet_hi_schedule(&el->tasklet);
> > + tasklet_hi_schedule(&engine->sched_engine->tasklet);
> > return;
> > }
> > @@ -1772,8 +1772,8 @@ process_csb(struct intel_engine_cs *engine, struct i915_request **inactive)
> > * access. Either we are inside the tasklet, or the tasklet is disabled
> > * and we assume that is only inside the reset paths and so serialised.
> > */
> > - GEM_BUG_ON(!tasklet_is_locked(&execlists->tasklet) &&
> > - !reset_in_progress(execlists));
> > + GEM_BUG_ON(!tasklet_is_locked(&engine->sched_engine->tasklet) &&
> > + !reset_in_progress(engine));
> > /*
> > * Note that csb_write, csb_status may be either in HWSP or mmio.
> > @@ -2131,7 +2131,7 @@ static void execlists_unhold(struct intel_engine_cs *engine,
> > if (rq_prio(rq) > engine->sched_engine->queue_priority_hint) {
> > engine->sched_engine->queue_priority_hint = rq_prio(rq);
> > - tasklet_hi_schedule(&engine->execlists.tasklet);
> > + tasklet_hi_schedule(&engine->sched_engine->tasklet);
> > }
> > spin_unlock_irq(&engine->sched_engine->lock);
> > @@ -2322,13 +2322,13 @@ static void execlists_reset(struct intel_engine_cs *engine, const char *msg)
> > ENGINE_TRACE(engine, "reset for %s\n", msg);
> > /* Mark this tasklet as disabled to avoid waiting for it to complete */
> > - tasklet_disable_nosync(&engine->execlists.tasklet);
> > + tasklet_disable_nosync(&engine->sched_engine->tasklet);
> > ring_set_paused(engine, 1); /* Freeze the current request in place */
> > execlists_capture(engine);
> > intel_engine_reset(engine, msg);
> > - tasklet_enable(&engine->execlists.tasklet);
> > + tasklet_enable(&engine->sched_engine->tasklet);
> > clear_and_wake_up_bit(bit, lock);
> > }
> > @@ -2351,8 +2351,9 @@ static bool preempt_timeout(const struct intel_engine_cs *const engine)
> > */
> > static void execlists_submission_tasklet(struct tasklet_struct *t)
> > {
> > - struct intel_engine_cs * const engine =
> > - from_tasklet(engine, t, execlists.tasklet);
> > + struct i915_sched_engine *sched_engine =
> > + from_tasklet(sched_engine, t, tasklet);
> > + struct intel_engine_cs * const engine = sched_engine->private_data;
> > struct i915_request *post[2 * EXECLIST_MAX_PORTS];
> > struct i915_request **inactive;
> > @@ -2427,13 +2428,16 @@ static void execlists_irq_handler(struct intel_engine_cs *engine, u16 iir)
> > intel_engine_signal_breadcrumbs(engine);
> > if (tasklet)
> > - tasklet_hi_schedule(&engine->execlists.tasklet);
> > + tasklet_hi_schedule(&engine->sched_engine->tasklet);
> > }
> > static void __execlists_kick(struct intel_engine_execlists *execlists)
> > {
> > + struct intel_engine_cs *engine =
> > + container_of(execlists, typeof(*engine), execlists);
> > +
> > /* Kick the tasklet for some interrupt coalescing and reset handling */
> > - tasklet_hi_schedule(&execlists->tasklet);
> > + tasklet_hi_schedule(&engine->sched_engine->tasklet);
> > }
> > #define execlists_kick(t, member) \
> > @@ -2808,10 +2812,8 @@ static int execlists_resume(struct intel_engine_cs *engine)
> > static void execlists_reset_prepare(struct intel_engine_cs *engine)
> > {
> > - struct intel_engine_execlists * const execlists = &engine->execlists;
> > -
> > ENGINE_TRACE(engine, "depth<-%d\n",
> > - atomic_read(&execlists->tasklet.count));
> > + atomic_read(&engine->sched_engine->tasklet.count));
> > /*
> > * Prevent request submission to the hardware until we have
> > @@ -2822,8 +2824,8 @@ static void execlists_reset_prepare(struct intel_engine_cs *engine)
> > * Turning off the execlists->tasklet until the reset is over
> > * prevents the race.
> > */
> > - __tasklet_disable_sync_once(&execlists->tasklet);
> > - GEM_BUG_ON(!reset_in_progress(execlists));
> > + __tasklet_disable_sync_once(&engine->sched_engine->tasklet);
> > + GEM_BUG_ON(!reset_in_progress(engine));
> > /*
> > * We stop engines, otherwise we might get failed reset and a
> > @@ -2973,8 +2975,9 @@ static void execlists_reset_rewind(struct intel_engine_cs *engine, bool stalled)
> > static void nop_submission_tasklet(struct tasklet_struct *t)
> > {
> > - struct intel_engine_cs * const engine =
> > - from_tasklet(engine, t, execlists.tasklet);
> > + struct i915_sched_engine *sched_engine =
> > + from_tasklet(sched_engine, t, tasklet);
> > + struct intel_engine_cs * const engine = sched_engine->private_data;
> > /* The driver is wedged; don't process any more events. */
> > WRITE_ONCE(engine->sched_engine->queue_priority_hint, INT_MIN);
> > @@ -3061,8 +3064,8 @@ static void execlists_reset_cancel(struct intel_engine_cs *engine)
> > sched_engine->queue_priority_hint = INT_MIN;
> > sched_engine->queue = RB_ROOT_CACHED;
> > - GEM_BUG_ON(__tasklet_is_enabled(&execlists->tasklet));
> > - execlists->tasklet.callback = nop_submission_tasklet;
> > + GEM_BUG_ON(__tasklet_is_enabled(&engine->sched_engine->tasklet));
> > + engine->sched_engine->tasklet.callback = nop_submission_tasklet;
> > spin_unlock_irqrestore(&engine->sched_engine->lock, flags);
> > rcu_read_unlock();
> > @@ -3082,14 +3085,14 @@ static void execlists_reset_finish(struct intel_engine_cs *engine)
> > * reset as the next level of recovery, and as a final resort we
> > * will declare the device wedged.
> > */
> > - GEM_BUG_ON(!reset_in_progress(execlists));
> > + GEM_BUG_ON(!reset_in_progress(engine));
> > /* And kick in case we missed a new request submission. */
> > - if (__tasklet_enable(&execlists->tasklet))
> > + if (__tasklet_enable(&engine->sched_engine->tasklet))
> > __execlists_kick(execlists);
> > ENGINE_TRACE(engine, "depth->%d\n",
> > - atomic_read(&execlists->tasklet.count));
> > + atomic_read(&engine->sched_engine->tasklet.count));
> > }
> > static void gen8_logical_ring_enable_irq(struct intel_engine_cs *engine)
> > @@ -3153,8 +3156,6 @@ static void kick_execlists(const struct i915_request *rq, int prio)
> > inflight->fence.context, inflight->fence.seqno,
> > inflight->sched.attr.priority);
> > - sched_engine->queue_priority_hint = prio;
> > -
>
> why is this being removed?
>
This looks like a mistake. Will fix.
> > /*
> > * Allow preemption of low -> normal -> high, but we do
> > * not allow low priority tasks to preempt other low priority
> > @@ -3163,7 +3164,7 @@ static void kick_execlists(const struct i915_request *rq, int prio)
> > * so kiss.
> > */
> > if (prio >= max(I915_PRIORITY_NORMAL, rq_prio(inflight)))
> > - tasklet_hi_schedule(&engine->execlists.tasklet);
> > + tasklet_hi_schedule(&sched_engine->tasklet);
> > unlock:
> > rcu_read_unlock();
> > @@ -3174,7 +3175,7 @@ static void execlists_set_default_submission(struct intel_engine_cs *engine)
> > engine->submit_request = execlists_submit_request;
> > engine->sched_engine->schedule = i915_schedule;
> > engine->sched_engine->kick_backend = kick_execlists;
> > - engine->execlists.tasklet.callback = execlists_submission_tasklet;
> > + engine->sched_engine->tasklet.callback = execlists_submission_tasklet;
> > }
> > static void execlists_shutdown(struct intel_engine_cs *engine)
> > @@ -3182,7 +3183,7 @@ static void execlists_shutdown(struct intel_engine_cs *engine)
> > /* Synchronise with residual timers and any softirq they raise */
> > del_timer_sync(&engine->execlists.timer);
> > del_timer_sync(&engine->execlists.preempt);
> > - tasklet_kill(&engine->execlists.tasklet);
> > + tasklet_kill(&engine->sched_engine->tasklet);
> > }
> > static void execlists_release(struct intel_engine_cs *engine)
> > @@ -3298,7 +3299,7 @@ int intel_execlists_submission_setup(struct intel_engine_cs *engine)
> > struct intel_uncore *uncore = engine->uncore;
> > u32 base = engine->mmio_base;
> > - tasklet_setup(&engine->execlists.tasklet, execlists_submission_tasklet);
> > + tasklet_setup(&engine->sched_engine->tasklet, execlists_submission_tasklet);
> > timer_setup(&engine->execlists.timer, execlists_timeslice, 0);
> > timer_setup(&engine->execlists.preempt, execlists_preempt, 0);
> > @@ -3380,7 +3381,7 @@ static void rcu_virtual_context_destroy(struct work_struct *wrk)
> > * rbtrees as in the case it is running in parallel, it may reinsert
> > * the rb_node into a sibling.
> > */
> > - tasklet_kill(&ve->base.execlists.tasklet);
> > + tasklet_kill(&ve->base.sched_engine->tasklet);
> > /* Decouple ourselves from the siblings, no more access allowed. */
> > for (n = 0; n < ve->num_siblings; n++) {
> > @@ -3392,13 +3393,13 @@ static void rcu_virtual_context_destroy(struct work_struct *wrk)
> > spin_lock_irq(&sibling->sched_engine->lock);
> > - /* Detachment is lazily performed in the execlists tasklet */
> > + /* Detachment is lazily performed in the sched_engine->tasklet */
> > if (!RB_EMPTY_NODE(node))
> > rb_erase_cached(node, &sibling->execlists.virtual);
> > spin_unlock_irq(&sibling->sched_engine->lock);
> > }
> > - GEM_BUG_ON(__tasklet_is_scheduled(&ve->base.execlists.tasklet));
> > + GEM_BUG_ON(__tasklet_is_scheduled(&ve->base.sched_engine->tasklet));
> > GEM_BUG_ON(!list_empty(virtual_queue(ve)));
> > lrc_fini(&ve->context);
> > @@ -3545,9 +3546,11 @@ static intel_engine_mask_t virtual_submission_mask(struct virtual_engine *ve)
> > static void virtual_submission_tasklet(struct tasklet_struct *t)
> > {
> > + struct i915_sched_engine *sched_engine =
> > + from_tasklet(sched_engine, t, tasklet);
> > struct virtual_engine * const ve =
> > - from_tasklet(ve, t, base.execlists.tasklet);
> > - const int prio = READ_ONCE(ve->base.sched_engine->queue_priority_hint);
> > + (struct virtual_engine *)sched_engine->private_data;
> > + const int prio = READ_ONCE(sched_engine->queue_priority_hint);
> > intel_engine_mask_t mask;
> > unsigned int n;
> > @@ -3616,7 +3619,7 @@ static void virtual_submission_tasklet(struct tasklet_struct *t)
> > GEM_BUG_ON(RB_EMPTY_NODE(&node->rb));
> > node->prio = prio;
> > if (first && prio > sibling->sched_engine->queue_priority_hint)
> > - tasklet_hi_schedule(&sibling->execlists.tasklet);
> > + tasklet_hi_schedule(&sibling->sched_engine->tasklet);
> > unlock_engine:
> > spin_unlock_irq(&sibling->sched_engine->lock);
> > @@ -3657,7 +3660,7 @@ static void virtual_submit_request(struct i915_request *rq)
> > GEM_BUG_ON(!list_empty(virtual_queue(ve)));
> > list_move_tail(&rq->sched.link, virtual_queue(ve));
> > - tasklet_hi_schedule(&ve->base.execlists.tasklet);
> > + tasklet_hi_schedule(&ve->base.sched_engine->tasklet);
> > unlock:
> > spin_unlock_irqrestore(&ve->base.sched_engine->lock, flags);
> > @@ -3751,6 +3754,7 @@ intel_execlists_create_virtual(struct intel_engine_cs **siblings,
> > err = -ENOMEM;
> > goto err_put;
> > }
> > + ve->base.sched_engine->private_data = &ve->base;
> > ve->base.cops = &virtual_context_ops;
> > ve->base.request_alloc = execlists_request_alloc;
> > @@ -3761,7 +3765,7 @@ intel_execlists_create_virtual(struct intel_engine_cs **siblings,
> > ve->base.bond_execute = virtual_bond_execute;
> > INIT_LIST_HEAD(virtual_queue(ve));
> > - tasklet_setup(&ve->base.execlists.tasklet, virtual_submission_tasklet);
> > + tasklet_setup(&ve->base.sched_engine->tasklet, virtual_submission_tasklet);
> > intel_context_init(&ve->context, &ve->base);
> > @@ -3789,7 +3793,7 @@ intel_execlists_create_virtual(struct intel_engine_cs **siblings,
> > * layering if we handle cloning of the requests and
> > * submitting a copy into each backend.
> > */
> > - if (sibling->execlists.tasklet.callback !=
> > + if (sibling->sched_engine->tasklet.callback !=
> > execlists_submission_tasklet) {
> > err = -ENODEV;
> > goto err_put;
> > diff --git a/drivers/gpu/drm/i915/gt/mock_engine.c b/drivers/gpu/drm/i915/gt/mock_engine.c
> > index a49fd3039f13..68970398e4ef 100644
> > --- a/drivers/gpu/drm/i915/gt/mock_engine.c
> > +++ b/drivers/gpu/drm/i915/gt/mock_engine.c
> > @@ -349,6 +349,7 @@ int mock_engine_init(struct intel_engine_cs *engine)
> > engine->sched_engine = i915_sched_engine_create(ENGINE_MOCK);
> > if (!engine->sched_engine)
> > return -ENOMEM;
> > + engine->sched_engine->private_data = engine;
> > intel_engine_init_execlists(engine);
> > intel_engine_init__pm(engine);
> > diff --git a/drivers/gpu/drm/i915/gt/selftest_execlists.c b/drivers/gpu/drm/i915/gt/selftest_execlists.c
> > index 6c0583e7a4c8..74ada241e4f0 100644
> > --- a/drivers/gpu/drm/i915/gt/selftest_execlists.c
> > +++ b/drivers/gpu/drm/i915/gt/selftest_execlists.c
> > @@ -43,7 +43,7 @@ static int wait_for_submit(struct intel_engine_cs *engine,
> > unsigned long timeout)
> > {
> > /* Ignore our own attempts to suppress excess tasklets */
> > - tasklet_hi_schedule(&engine->execlists.tasklet);
> > + tasklet_hi_schedule(&engine->sched_engine->tasklet);
> > timeout += jiffies;
> > do {
> > @@ -606,9 +606,9 @@ static int live_hold_reset(void *arg)
> > err = -EBUSY;
> > goto out;
> > }
> > - tasklet_disable(&engine->execlists.tasklet);
> > + tasklet_disable(&engine->sched_engine->tasklet);
> > - engine->execlists.tasklet.callback(&engine->execlists.tasklet);
> > + engine->sched_engine->tasklet.callback(&engine->sched_engine->tasklet);
> > GEM_BUG_ON(execlists_active(&engine->execlists) != rq);
> > i915_request_get(rq);
> > @@ -618,7 +618,7 @@ static int live_hold_reset(void *arg)
> > __intel_engine_reset_bh(engine, NULL);
> > GEM_BUG_ON(rq->fence.error != -EIO);
> > - tasklet_enable(&engine->execlists.tasklet);
> > + tasklet_enable(&engine->sched_engine->tasklet);
> > clear_and_wake_up_bit(I915_RESET_ENGINE + id,
> > >->reset.flags);
> > local_bh_enable();
> > @@ -1183,7 +1183,7 @@ static int live_timeslice_rewind(void *arg)
> > while (i915_request_is_active(rq[A2])) { /* semaphore yield! */
> > /* Wait for the timeslice to kick in */
> > del_timer(&engine->execlists.timer);
> > - tasklet_hi_schedule(&engine->execlists.tasklet);
> > + tasklet_hi_schedule(&engine->sched_engine->tasklet);
> > intel_engine_flush_submission(engine);
> > }
> > /* -> ELSP[] = { { A:rq1 }, { B:rq1 } } */
> > @@ -4593,9 +4593,9 @@ static int reset_virtual_engine(struct intel_gt *gt,
> > err = -EBUSY;
> > goto out_heartbeat;
> > }
> > - tasklet_disable(&engine->execlists.tasklet);
> > + tasklet_disable(&engine->sched_engine->tasklet);
> > - engine->execlists.tasklet.callback(&engine->execlists.tasklet);
> > + engine->sched_engine->tasklet.callback(&engine->sched_engine->tasklet);
> > GEM_BUG_ON(execlists_active(&engine->execlists) != rq);
> > /* Fake a preemption event; failed of course */
> > @@ -4612,7 +4612,7 @@ static int reset_virtual_engine(struct intel_gt *gt,
> > GEM_BUG_ON(rq->fence.error != -EIO);
> > /* Release our grasp on the engine, letting CS flow again */
> > - tasklet_enable(&engine->execlists.tasklet);
> > + tasklet_enable(&engine->sched_engine->tasklet);
> > clear_and_wake_up_bit(I915_RESET_ENGINE + engine->id, >->reset.flags);
> > local_bh_enable();
> > diff --git a/drivers/gpu/drm/i915/gt/selftest_hangcheck.c b/drivers/gpu/drm/i915/gt/selftest_hangcheck.c
> > index cec4b9977c9b..6a0b04bdac58 100644
> > --- a/drivers/gpu/drm/i915/gt/selftest_hangcheck.c
> > +++ b/drivers/gpu/drm/i915/gt/selftest_hangcheck.c
> > @@ -1702,7 +1702,7 @@ static int __igt_atomic_reset_engine(struct intel_engine_cs *engine,
> > const struct igt_atomic_section *p,
> > const char *mode)
> > {
> > - struct tasklet_struct * const t = &engine->execlists.tasklet;
> > + struct tasklet_struct * const t = &engine->sched_engine->tasklet;
> > int err;
> > GEM_TRACE("i915_reset_engine(%s:%s) under %s\n",
> > diff --git a/drivers/gpu/drm/i915/gt/selftest_lrc.c b/drivers/gpu/drm/i915/gt/selftest_lrc.c
> > index 3119016d9910..b0977a3b699b 100644
> > --- a/drivers/gpu/drm/i915/gt/selftest_lrc.c
> > +++ b/drivers/gpu/drm/i915/gt/selftest_lrc.c
> > @@ -49,7 +49,7 @@ static int wait_for_submit(struct intel_engine_cs *engine,
> > unsigned long timeout)
> > {
> > /* Ignore our own attempts to suppress excess tasklets */
> > - tasklet_hi_schedule(&engine->execlists.tasklet);
> > + tasklet_hi_schedule(&engine->sched_engine->tasklet);
> > timeout += jiffies;
> > do {
> > @@ -1613,12 +1613,12 @@ static void garbage_reset(struct intel_engine_cs *engine,
> > local_bh_disable();
> > if (!test_and_set_bit(bit, lock)) {
> > - tasklet_disable(&engine->execlists.tasklet);
> > + tasklet_disable(&engine->sched_engine->tasklet);
> > if (!rq->fence.error)
> > __intel_engine_reset_bh(engine, NULL);
> > - tasklet_enable(&engine->execlists.tasklet);
> > + tasklet_enable(&engine->sched_engine->tasklet);
> > clear_and_wake_up_bit(bit, lock);
> > }
> > local_bh_enable();
> > diff --git a/drivers/gpu/drm/i915/gt/selftest_reset.c b/drivers/gpu/drm/i915/gt/selftest_reset.c
> > index 8784257ec808..7a50c9f4071b 100644
> > --- a/drivers/gpu/drm/i915/gt/selftest_reset.c
> > +++ b/drivers/gpu/drm/i915/gt/selftest_reset.c
> > @@ -321,7 +321,7 @@ static int igt_atomic_engine_reset(void *arg)
> > goto out_unlock;
> > for_each_engine(engine, gt, id) {
> > - struct tasklet_struct *t = &engine->execlists.tasklet;
> > + struct tasklet_struct *t = &engine->sched_engine->tasklet;
> > if (t->func)
> > tasklet_disable(t);
> > diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
> > index cb13cc586c67..e9c237b18692 100644
> > --- a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
> > +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
> > @@ -241,8 +241,9 @@ static void __guc_dequeue(struct intel_engine_cs *engine)
> > static void guc_submission_tasklet(struct tasklet_struct *t)
> > {
> > - struct intel_engine_cs * const engine =
> > - from_tasklet(engine, t, execlists.tasklet);
> > + struct i915_sched_engine *sched_engine =
> > + from_tasklet(sched_engine, t, tasklet);
> > + struct intel_engine_cs * const engine = sched_engine->private_data;
> > struct intel_engine_execlists * const execlists = &engine->execlists;
> > struct i915_request **port, *rq;
> > unsigned long flags;
> > @@ -272,14 +273,12 @@ static void cs_irq_handler(struct intel_engine_cs *engine, u16 iir)
> > {
> > if (iir & GT_RENDER_USER_INTERRUPT) {
> > intel_engine_signal_breadcrumbs(engine);
> > - tasklet_hi_schedule(&engine->execlists.tasklet);
> > + tasklet_hi_schedule(&engine->sched_engine->tasklet);
> > }
> > }
> > static void guc_reset_prepare(struct intel_engine_cs *engine)
> > {
> > - struct intel_engine_execlists * const execlists = &engine->execlists;
> > -
> > ENGINE_TRACE(engine, "\n");
> > /*
> > @@ -291,7 +290,7 @@ static void guc_reset_prepare(struct intel_engine_cs *engine)
> > * Turning off the execlists->tasklet until the reset is over
> > * prevents the race.
> > */
> > - __tasklet_disable_sync_once(&execlists->tasklet);
> > + __tasklet_disable_sync_once(&engine->sched_engine->tasklet);
> > }
> > static void guc_reset_state(struct intel_context *ce,
> > @@ -395,14 +394,12 @@ static void guc_reset_cancel(struct intel_engine_cs *engine)
> > static void guc_reset_finish(struct intel_engine_cs *engine)
> > {
> > - struct intel_engine_execlists * const execlists = &engine->execlists;
> > -
> > - if (__tasklet_enable(&execlists->tasklet))
> > + if (__tasklet_enable(&engine->sched_engine->tasklet))
> > /* And kick in case we missed a new request submission. */
> > - tasklet_hi_schedule(&execlists->tasklet);
> > + tasklet_hi_schedule(&engine->sched_engine->tasklet);
> > ENGINE_TRACE(engine, "depth->%d\n",
> > - atomic_read(&execlists->tasklet.count));
> > + atomic_read(&engine->sched_engine->tasklet.count));
> > }
> > /*
> > @@ -520,7 +517,7 @@ static void guc_submit_request(struct i915_request *rq)
> > GEM_BUG_ON(i915_sched_engine_is_empty(engine->sched_engine));
> > GEM_BUG_ON(list_empty(&rq->sched.link));
> > - tasklet_hi_schedule(&engine->execlists.tasklet);
> > + tasklet_hi_schedule(&engine->sched_engine->tasklet);
> > spin_unlock_irqrestore(&engine->sched_engine->lock, flags);
> > }
> > @@ -600,7 +597,7 @@ static void guc_release(struct intel_engine_cs *engine)
> > {
> > engine->sanitize = NULL; /* no longer in control, nothing to sanitize */
> > - tasklet_kill(&engine->execlists.tasklet);
> > + tasklet_kill(&engine->sched_engine->tasklet);
> > intel_engine_cleanup_common(engine);
> > lrc_fini_wa_ctx(engine);
> > @@ -679,7 +676,7 @@ int intel_guc_submission_setup(struct intel_engine_cs *engine)
> > */
> > GEM_BUG_ON(GRAPHICS_VER(i915) < 11);
> > - tasklet_setup(&engine->execlists.tasklet, guc_submission_tasklet);
> > + tasklet_setup(&engine->sched_engine->tasklet, guc_submission_tasklet);
> > guc_default_vfuncs(engine);
> > guc_default_irqs(engine);
> > diff --git a/drivers/gpu/drm/i915/i915_scheduler.c b/drivers/gpu/drm/i915/i915_scheduler.c
> > index fa8863df9513..3a58a9130309 100644
> > --- a/drivers/gpu/drm/i915/i915_scheduler.c
> > +++ b/drivers/gpu/drm/i915/i915_scheduler.c
> > @@ -436,6 +436,7 @@ void i915_sched_engine_free(struct kref *kref)
> > struct i915_sched_engine *sched_engine =
> > container_of(kref, typeof(*sched_engine), ref);
> > + tasklet_kill(&sched_engine->tasklet); /* flush the callback */
> > kfree(sched_engine);
> > }
> > diff --git a/drivers/gpu/drm/i915/i915_scheduler.h b/drivers/gpu/drm/i915/i915_scheduler.h
> > index 0014745bda30..650ab8e0db9f 100644
> > --- a/drivers/gpu/drm/i915/i915_scheduler.h
> > +++ b/drivers/gpu/drm/i915/i915_scheduler.h
> > @@ -79,6 +79,20 @@ i915_sched_engine_reset_on_empty(struct i915_sched_engine *sched_engine)
> > sched_engine->no_priolist = false;
> > }
> > +static inline void
> > +i915_sched_engine_active_lock_bh(struct i915_sched_engine *sched_engine)
> > +{
> > + local_bh_disable(); /* prevent local softirq and lock recursion */
> > + tasklet_lock(&sched_engine->tasklet);
> > +}
> > +
> > +static inline void
> > +i915_sched_engine_active_unlock_bh(struct i915_sched_engine *sched_engine)
> > +{
> > + tasklet_unlock(&sched_engine->tasklet);
> > + local_bh_enable(); /* restore softirq, and kick ksoftirqd! */
> > +}
> > +
> > void i915_request_show_with_schedule(struct drm_printer *m,
> > const struct i915_request *rq,
> > const char *prefix,
> > diff --git a/drivers/gpu/drm/i915/i915_scheduler_types.h b/drivers/gpu/drm/i915/i915_scheduler_types.h
> > index 8bd07d0c27e1..b26335e9e3fa 100644
> > --- a/drivers/gpu/drm/i915/i915_scheduler_types.h
> > +++ b/drivers/gpu/drm/i915/i915_scheduler_types.h
> > @@ -124,6 +124,11 @@ struct i915_sched_engine {
> > */
> > struct list_head hold;
> > + /**
> > + * @tasklet: softirq tasklet for submission
> > + */
> > + struct tasklet_struct tasklet;
> > +
> > /**
> > * @default_priolist: priority list for I915_PRIORITY_NORMAL
> > */
> > @@ -153,6 +158,11 @@ struct i915_sched_engine {
> > */
> > bool no_priolist;
> > + /**
> > + * @private_data: private data
>
> Here I'd highlight who owns the private data, something like:
>
> * @private_data: private data of the submission backend
>
Will do.
Matt
>
> Daniele
>
> > + */
> > + void *private_data;
> > +
> > /**
> > * @kick_backend: kick backend after a request's priority has changed
> > */
>
