diff options
23 files changed, 890 insertions, 1481 deletions
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c index c9c230499420..29d52304c189 100644 --- a/drivers/gpu/drm/i915/i915_debugfs.c +++ b/drivers/gpu/drm/i915/i915_debugfs.c @@ -1315,29 +1315,16 @@ static int i915_hangcheck_info(struct seq_file *m, void *unused) seq_printf(m, "GT active? %s\n", yesno(dev_priv->gt.awake)); for_each_engine(engine, dev_priv, id) { - struct intel_breadcrumbs *b = &engine->breadcrumbs; - struct rb_node *rb; - seq_printf(m, "%s:\n", engine->name); seq_printf(m, "\tseqno = %x [current %x, last %x], %dms ago\n", engine->hangcheck.seqno, seqno[id], intel_engine_last_submit(engine), jiffies_to_msecs(jiffies - engine->hangcheck.action_timestamp)); - seq_printf(m, "\twaiters? %s, fake irq active? %s\n", - yesno(intel_engine_has_waiter(engine)), + seq_printf(m, "\tfake irq active? %s\n", yesno(test_bit(engine->id, &dev_priv->gpu_error.missed_irq_rings))); - spin_lock_irq(&b->rb_lock); - for (rb = rb_first(&b->waiters); rb; rb = rb_next(rb)) { - struct intel_wait *w = rb_entry(rb, typeof(*w), node); - - seq_printf(m, "\t%s [%d] waiting for %x\n", - w->tsk->comm, w->tsk->pid, w->seqno); - } - spin_unlock_irq(&b->rb_lock); - seq_printf(m, "\tACTHD = 0x%08llx [current 0x%08llx]\n", (long long)engine->hangcheck.acthd, (long long)acthd[id]); @@ -2021,18 +2008,6 @@ static int i915_swizzle_info(struct seq_file *m, void *data) return 0; } -static int count_irq_waiters(struct drm_i915_private *i915) -{ - struct intel_engine_cs *engine; - enum intel_engine_id id; - int count = 0; - - for_each_engine(engine, i915, id) - count += intel_engine_has_waiter(engine); - - return count; -} - static const char *rps_power_to_str(unsigned int power) { static const char * const strings[] = { @@ -2072,7 +2047,6 @@ static int i915_rps_boost_info(struct seq_file *m, void *data) seq_printf(m, "RPS enabled? %d\n", rps->enabled); seq_printf(m, "GPU busy? %s [%d requests]\n", yesno(dev_priv->gt.awake), dev_priv->gt.active_requests); - seq_printf(m, "CPU waiting? %d\n", count_irq_waiters(dev_priv)); seq_printf(m, "Boosts outstanding? %d\n", atomic_read(&rps->num_waiters)); seq_printf(m, "Interactive? %d\n", READ_ONCE(rps->power.interactive)); diff --git a/drivers/gpu/drm/i915/i915_gem_context.c b/drivers/gpu/drm/i915/i915_gem_context.c index 93e84751370f..6faf1f6faab5 100644 --- a/drivers/gpu/drm/i915/i915_gem_context.c +++ b/drivers/gpu/drm/i915/i915_gem_context.c @@ -327,6 +327,9 @@ intel_context_init(struct intel_context *ce, struct intel_engine_cs *engine) { ce->gem_context = ctx; + + INIT_LIST_HEAD(&ce->signal_link); + INIT_LIST_HEAD(&ce->signals); } static struct i915_gem_context * diff --git a/drivers/gpu/drm/i915/i915_gem_context.h b/drivers/gpu/drm/i915/i915_gem_context.h index 3769438228f6..6ba40ff6b91f 100644 --- a/drivers/gpu/drm/i915/i915_gem_context.h +++ b/drivers/gpu/drm/i915/i915_gem_context.h @@ -164,6 +164,8 @@ struct i915_gem_context { struct intel_context { struct i915_gem_context *gem_context; struct intel_engine_cs *active; + struct list_head signal_link; + struct list_head signals; struct i915_vma *state; struct intel_ring *ring; u32 *lrc_reg_state; diff --git a/drivers/gpu/drm/i915/i915_gpu_error.c b/drivers/gpu/drm/i915/i915_gpu_error.c index 898e06014295..304a7ef7f7fb 100644 --- a/drivers/gpu/drm/i915/i915_gpu_error.c +++ b/drivers/gpu/drm/i915/i915_gpu_error.c @@ -447,9 +447,14 @@ static void error_print_request(struct drm_i915_error_state_buf *m, if (!erq->seqno) return; - err_printf(m, "%s pid %d, ban score %d, seqno %8x:%08x, prio %d, emitted %dms, start %08x, head %08x, tail %08x\n", + err_printf(m, "%s pid %d, ban score %d, seqno %8x:%08x%s%s, prio %d, emitted %dms, start %08x, head %08x, tail %08x\n", prefix, erq->pid, erq->ban_score, - erq->context, erq->seqno, erq->sched_attr.priority, + erq->context, erq->seqno, + test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, + &erq->flags) ? "!" : "", + test_bit(DMA_FENCE_FLAG_ENABLE_SIGNAL_BIT, + &erq->flags) ? "+" : "", + erq->sched_attr.priority, jiffies_to_msecs(erq->jiffies - epoch), erq->start, erq->head, erq->tail); } @@ -530,7 +535,6 @@ static void error_print_engine(struct drm_i915_error_state_buf *m, } err_printf(m, " seqno: 0x%08x\n", ee->seqno); err_printf(m, " last_seqno: 0x%08x\n", ee->last_seqno); - err_printf(m, " waiting: %s\n", yesno(ee->waiting)); err_printf(m, " ring->head: 0x%08x\n", ee->cpu_ring_head); err_printf(m, " ring->tail: 0x%08x\n", ee->cpu_ring_tail); err_printf(m, " hangcheck timestamp: %dms (%lu%s)\n", @@ -804,21 +808,6 @@ static void __err_print_to_sgl(struct drm_i915_error_state_buf *m, error->epoch); } - if (IS_ERR(ee->waiters)) { - err_printf(m, "%s --- ? waiters [unable to acquire spinlock]\n", - m->i915->engine[i]->name); - } else if (ee->num_waiters) { - err_printf(m, "%s --- %d waiters\n", - m->i915->engine[i]->name, - ee->num_waiters); - for (j = 0; j < ee->num_waiters; j++) { - err_printf(m, " seqno 0x%08x for %s [%d]\n", - ee->waiters[j].seqno, - ee->waiters[j].comm, - ee->waiters[j].pid); - } - } - print_error_obj(m, m->i915->engine[i], "ringbuffer", ee->ringbuffer); @@ -1000,8 +989,6 @@ void __i915_gpu_state_free(struct kref *error_ref) i915_error_object_free(ee->wa_ctx); kfree(ee->requests); - if (!IS_ERR_OR_NULL(ee->waiters)) - kfree(ee->waiters); } for (i = 0; i < ARRAY_SIZE(error->active_bo); i++) @@ -1205,59 +1192,6 @@ static void gen6_record_semaphore_state(struct intel_engine_cs *engine, I915_READ(RING_SYNC_2(engine->mmio_base)); } -static void error_record_engine_waiters(struct intel_engine_cs *engine, - struct drm_i915_error_engine *ee) -{ - struct intel_breadcrumbs *b = &engine->breadcrumbs; - struct drm_i915_error_waiter *waiter; - struct rb_node *rb; - int count; - - ee->num_waiters = 0; - ee->waiters = NULL; - - if (RB_EMPTY_ROOT(&b->waiters)) - return; - - if (!spin_trylock_irq(&b->rb_lock)) { - ee->waiters = ERR_PTR(-EDEADLK); - return; - } - - count = 0; - for (rb = rb_first(&b->waiters); rb != NULL; rb = rb_next(rb)) - count++; - spin_unlock_irq(&b->rb_lock); - - waiter = NULL; - if (count) - waiter = kmalloc_array(count, - sizeof(struct drm_i915_error_waiter), - GFP_ATOMIC); - if (!waiter) - return; - - if (!spin_trylock_irq(&b->rb_lock)) { - kfree(waiter); - ee->waiters = ERR_PTR(-EDEADLK); - return; - } - - ee->waiters = waiter; - for (rb = rb_first(&b->waiters); rb; rb = rb_next(rb)) { - struct intel_wait *w = rb_entry(rb, typeof(*w), node); - - strcpy(waiter->comm, w->tsk->comm); - waiter->pid = w->tsk->pid; - waiter->seqno = w->seqno; - waiter++; - - if (++ee->num_waiters == count) - break; - } - spin_unlock_irq(&b->rb_lock); -} - static void error_record_engine_registers(struct i915_gpu_state *error, struct intel_engine_cs *engine, struct drm_i915_error_engine *ee) @@ -1293,7 +1227,6 @@ static void error_record_engine_registers(struct i915_gpu_state *error, intel_engine_get_instdone(engine, &ee->instdone); - ee->waiting = intel_engine_has_waiter(engine); ee->instpm = I915_READ(RING_INSTPM(engine->mmio_base)); ee->acthd = intel_engine_get_active_head(engine); ee->seqno = intel_engine_get_seqno(engine); @@ -1367,6 +1300,7 @@ static void record_request(struct i915_request *request, { struct i915_gem_context *ctx = request->gem_context; + erq->flags = request->fence.flags; erq->context = ctx->hw_id; erq->sched_attr = request->sched.attr; erq->ban_score = atomic_read(&ctx->ban_score); @@ -1542,7 +1476,6 @@ static void gem_record_rings(struct i915_gpu_state *error) ee->engine_id = i; error_record_engine_registers(error, engine, ee); - error_record_engine_waiters(engine, ee); error_record_engine_execlists(engine, ee); request = i915_gem_find_active_request(engine); diff --git a/drivers/gpu/drm/i915/i915_gpu_error.h b/drivers/gpu/drm/i915/i915_gpu_error.h index 231173786eae..74757c424aab 100644 --- a/drivers/gpu/drm/i915/i915_gpu_error.h +++ b/drivers/gpu/drm/i915/i915_gpu_error.h @@ -82,8 +82,6 @@ struct i915_gpu_state { int engine_id; /* Software tracked state */ bool idle; - bool waiting; - int num_waiters; unsigned long hangcheck_timestamp; struct i915_address_space *vm; int num_requests; @@ -147,6 +145,7 @@ struct i915_gpu_state { struct drm_i915_error_object *default_state; struct drm_i915_error_request { + unsigned long flags; long jiffies; pid_t pid; u32 context; @@ -159,12 +158,6 @@ struct i915_gpu_state { } *requests, execlist[EXECLIST_MAX_PORTS]; unsigned int num_ports; - struct drm_i915_error_waiter { - char comm[TASK_COMM_LEN]; - pid_t pid; - u32 seqno; - } *waiters; - struct { u32 gfx_mode; union { diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c index 0fcdb14c50f4..eab085686a2a 100644 --- a/drivers/gpu/drm/i915/i915_irq.c +++ b/drivers/gpu/drm/i915/i915_irq.c @@ -1169,66 +1169,6 @@ static void ironlake_rps_change_irq_handler(struct drm_i915_private *dev_priv) return; } -static void notify_ring(struct intel_engine_cs *engine) -{ - const u32 seqno = intel_engine_get_seqno(engine); - struct i915_request *rq = NULL; - struct task_struct *tsk = NULL; - struct intel_wait *wait; - - if (unlikely(!engine->breadcrumbs.irq_armed)) - return; - - rcu_read_lock(); - - spin_lock(&engine->breadcrumbs.irq_lock); - wait = engine->breadcrumbs.irq_wait; - if (wait) { - /* - * We use a callback from the dma-fence to submit - * requests after waiting on our own requests. To - * ensure minimum delay in queuing the next request to - * hardware, signal the fence now rather than wait for - * the signaler to be woken up. We still wake up the - * waiter in order to handle the irq-seqno coherency - * issues (we may receive the interrupt before the - * seqno is written, see __i915_request_irq_complete()) - * and to handle coalescing of multiple seqno updates - * and many waiters. - */ - if (i915_seqno_passed(seqno, wait->seqno)) { - struct i915_request *waiter = wait->request; - - if (waiter && - !i915_request_signaled(waiter) && - intel_wait_check_request(wait, waiter)) - rq = i915_request_get(waiter); - - tsk = wait->tsk; - } - - engine->breadcrumbs.irq_count++; - } else { - if (engine->breadcrumbs.irq_armed) - __intel_engine_disarm_breadcrumbs(engine); - } - spin_unlock(&engine->breadcrumbs.irq_lock); - - if (rq) { - spin_lock(&rq->lock); - dma_fence_signal_locked(&rq->fence); - GEM_BUG_ON(!i915_request_completed(rq)); - spin_unlock(&rq->lock); - - i915_request_put(rq); - } - - if (tsk && tsk->state & TASK_NORMAL) - wake_up_process(tsk); - - rcu_read_unlock(); -} - static void vlv_c0_read(struct drm_i915_private *dev_priv, struct intel_rps_ei *ei) { @@ -1473,20 +1413,20 @@ static void ilk_gt_irq_handler(struct drm_i915_private *dev_priv, u32 gt_iir) { if (gt_iir & GT_RENDER_USER_INTERRUPT) - notify_ring(dev_priv->engine[RCS]); + intel_engine_breadcrumbs_irq(dev_priv->engine[RCS]); if (gt_iir & ILK_BSD_USER_INTERRUPT) - notify_ring(dev_priv->engine[VCS]); + intel_engine_breadcrumbs_irq(dev_priv->engine[VCS]); } static void snb_gt_irq_handler(struct drm_i915_private *dev_priv, u32 gt_iir) { if (gt_iir & GT_RENDER_USER_INTERRUPT) - notify_ring(dev_priv->engine[RCS]); + intel_engine_breadcrumbs_irq(dev_priv->engine[RCS]); if (gt_iir & GT_BSD_USER_INTERRUPT) - notify_ring(dev_priv->engine[VCS]); + intel_engine_breadcrumbs_irq(dev_priv->engine[VCS]); if (gt_iir & GT_BLT_USER_INTERRUPT) - notify_ring(dev_priv->engine[BCS]); + intel_engine_breadcrumbs_irq(dev_priv->engine[BCS]); if (gt_iir & (GT_BLT_CS_ERROR_INTERRUPT | GT_BSD_CS_ERROR_INTERRUPT | @@ -1506,7 +1446,7 @@ gen8_cs_irq_handler(struct intel_engine_cs *engine, u32 iir) tasklet = true; if (iir & GT_RENDER_USER_INTERRUPT) { - notify_ring(engine); + intel_engine_breadcrumbs_irq(engine); tasklet |= USES_GUC_SUBMISSION(engine->i915); } @@ -1852,7 +1792,7 @@ static void gen6_rps_irq_handler(struct drm_i915_private *dev_priv, u32 pm_iir) if (HAS_VEBOX(dev_priv)) { if (pm_iir & PM_VEBOX_USER_INTERRUPT) - notify_ring(dev_priv->engine[VECS]); + intel_engine_breadcrumbs_irq(dev_priv->engine[VECS]); if (pm_iir & PM_VEBOX_CS_ERROR_INTERRUPT) DRM_DEBUG("Command parser error, pm_iir 0x%08x\n", pm_iir); @@ -4276,7 +4216,7 @@ static irqreturn_t i8xx_irq_handler(int irq, void *arg) I915_WRITE16(IIR, iir); if (iir & I915_USER_INTERRUPT) - notify_ring(dev_priv->engine[RCS]); + intel_engine_breadcrumbs_irq(dev_priv->engine[RCS]); if (iir & I915_MASTER_ERROR_INTERRUPT) i8xx_error_irq_handler(dev_priv, eir, eir_stuck); @@ -4384,7 +4324,7 @@ static irqreturn_t i915_irq_handler(int irq, void *arg) I915_WRITE(IIR, iir); if (iir & I915_USER_INTERRUPT) - notify_ring(dev_priv->engine[RCS]); + intel_engine_breadcrumbs_irq(dev_priv->engine[RCS]); if (iir & I915_MASTER_ERROR_INTERRUPT) i9xx_error_irq_handler(dev_priv, eir, eir_stuck); @@ -4529,10 +4469,10 @@ static irqreturn_t i965_irq_handler(int irq, void *arg) I915_WRITE(IIR, iir); if (iir & I915_USER_INTERRUPT) - notify_ring(dev_priv->engine[RCS]); + intel_engine_breadcrumbs_irq(dev_priv->engine[RCS]); if (iir & I915_BSD_USER_INTERRUPT) - notify_ring(dev_priv->engine[VCS]); + intel_engine_breadcrumbs_irq(dev_priv->engine[VCS]); if (iir & I915_MASTER_ERROR_INTERRUPT) i9xx_error_irq_handler(dev_priv, eir, eir_stuck); diff --git a/drivers/gpu/drm/i915/i915_request.c b/drivers/gpu/drm/i915/i915_request.c index 7db15b7b3de8..9ed5baf157a3 100644 --- a/drivers/gpu/drm/i915/i915_request.c +++ b/drivers/gpu/drm/i915/i915_request.c @@ -60,7 +60,7 @@ static bool i915_fence_signaled(struct dma_fence *fence) static bool i915_fence_enable_signaling(struct dma_fence *fence) { - return intel_engine_enable_signaling(to_request(fence), true); + return i915_request_enable_breadcrumb(to_request(fence)); } static signed long i915_fence_wait(struct dma_fence *fence, @@ -203,7 +203,7 @@ static void __retire_engine_request(struct intel_engine_cs *engine, if (!i915_request_signaled(rq)) dma_fence_signal_locked(&rq->fence); if (test_bit(DMA_FENCE_FLAG_ENABLE_SIGNAL_BIT, &rq->fence.flags)) - intel_engine_cancel_signaling(rq); + i915_request_cancel_breadcrumb(rq); if (rq->waitboost) { GEM_BUG_ON(!atomic_read(&rq->i915->gt_pm.rps.num_waiters)); atomic_dec(&rq->i915->gt_pm.rps.num_waiters); @@ -377,9 +377,12 @@ void __i915_request_submit(struct i915_request *request) /* We may be recursing from the signal callback of another i915 fence */ spin_lock_nested(&request->lock, SINGLE_DEPTH_NESTING); + GEM_BUG_ON(test_bit(I915_FENCE_FLAG_ACTIVE, &request->fence.flags)); + set_bit(I915_FENCE_FLAG_ACTIVE, &request->fence.flags); request->global_seqno = seqno; - if (test_bit(DMA_FENCE_FLAG_ENABLE_SIGNAL_BIT, &request->fence.flags)) - intel_engine_enable_signaling(request, false); + if (test_bit(DMA_FENCE_FLAG_ENABLE_SIGNAL_BIT, &request->fence.flags) && + !i915_request_enable_breadcrumb(request)) + intel_engine_queue_breadcrumbs(engine); spin_unlock(&request->lock); engine->emit_fini_breadcrumb(request, @@ -389,8 +392,6 @@ void __i915_request_submit(struct i915_request *request) move_to_timeline(request, &engine->timeline); trace_i915_request_execute(request); - - wake_up_all(&request->execute); } void i915_request_submit(struct i915_request *request) @@ -433,7 +434,9 @@ void __i915_request_unsubmit(struct i915_request *request) spin_lock_nested(&request->lock, SINGLE_DEPTH_NESTING); request->global_seqno = 0; if (test_bit(DMA_FENCE_FLAG_ENABLE_SIGNAL_BIT, &request->fence.flags)) - intel_engine_cancel_signaling(request); + i915_request_cancel_breadcrumb(request); + GEM_BUG_ON(!test_bit(I915_FENCE_FLAG_ACTIVE, &request->fence.flags)); + clear_bit(I915_FENCE_FLAG_ACTIVE, &request->fence.flags); spin_unlock(&request->lock); /* Transfer back from the global per-engine timeline to per-context */ @@ -633,13 +636,11 @@ i915_request_alloc(struct intel_engine_cs *engine, struct i915_gem_context *ctx) /* We bump the ref for the fence chain */ i915_sw_fence_init(&i915_request_get(rq)->submit, submit_notify); - init_waitqueue_head(&rq->execute); i915_sched_node_init(&rq->sched); /* No zalloc, must clear what we need by hand */ rq->global_seqno = 0; - rq->signaling.wait.seqno = 0; rq->file_priv = NULL; rq->batch = NULL; rq->capture_list = NULL; @@ -1030,13 +1031,10 @@ static bool busywait_stop(unsigned long timeout, unsigned int cpu) return this_cpu != cpu; } -static bool __i915_spin_request(const struct i915_request *rq, - u32 seqno, int state, unsigned long timeout_us) +static bool __i915_spin_request(const struct i915_request * const rq, + int state, unsigned long timeout_us) { - struct intel_engine_cs *engine = rq->engine; - unsigned int irq, cpu; - - GEM_BUG_ON(!seqno); + unsigned int cpu; /* * Only wait for the request if we know it is likely to complete. @@ -1044,12 +1042,12 @@ static bool __i915_spin_request(const struct i915_request *rq, * We don't track the timestamps around requests, nor the average * request length, so we do not have a good indicator that this * request will complete within the timeout. What we do know is the - * order in which requests are executed by the engine and so we can - * tell if the request has started. If the request hasn't started yet, - * it is a fair assumption that it will not complete within our - * relatively short timeout. + * order in which requests are executed by the context and so we can + * tell if the request has been started. If the request is not even + * running yet, it is a fair assumption that it will not complete + * within our relatively short timeout. */ - if (!intel_engine_has_started(engine, seqno)) + if (!i915_request_is_running(rq)) return false; /* @@ -1063,20 +1061,10 @@ static bool __i915_spin_request(const struct i915_request *rq, * takes to sleep on a request, on the order of a microsecond. */ - irq = READ_ONCE(engine->breadcrumbs.irq_count); timeout_us += local_clock_us(&cpu); do { - if (intel_engine_has_completed(engine, seqno)) - return seqno == i915_request_global_seqno(rq); - - /* - * Seqno are meant to be ordered *before* the interrupt. If - * we see an interrupt without a corresponding seqno advance, - * assume we won't see one in the near future but require - * the engine->seqno_barrier() to fixup coherency. - */ - if (READ_ONCE(engine->breadcrumbs.irq_count) != irq) - break; + if (i915_request_completed(rq)) + return true; if (signal_pending_state(state, current)) break; @@ -1090,6 +1078,18 @@ static bool __i915_spin_request(const struct i915_request *rq, return false; } +struct request_wait { + struct dma_fence_cb cb; + struct task_struct *tsk; +}; + +static void request_wait_wake(struct dma_fence *fence, struct dma_fence_cb *cb) +{ + struct request_wait *wait = container_of(cb, typeof(*wait), cb); + + wake_up_process(wait->tsk); +} + /** * i915_request_wait - wait until execution of request has finished * @rq: the request to wait upon @@ -1115,8 +1115,7 @@ long i915_request_wait(struct i915_request *rq, { const int state = flags & I915_WAIT_INTERRUPTIBLE ? TASK_INTERRUPTIBLE : TASK_UNINTERRUPTIBLE; - DEFINE_WAIT_FUNC(exec, default_wake_function); - struct intel_wait wait; + struct request_wait wait; might_sleep(); GEM_BUG_ON(timeout < 0); @@ -1128,47 +1127,24 @@ long i915_request_wait(struct i915_request *rq, return -ETIME; trace_i915_request_wait_begin(rq, flags); - add_wait_queue(&rq->execute, &exec); - intel_wait_init(&wait); - if (flags & I915_WAIT_PRIORITY) - i915_schedule_bump_priority(rq, I915_PRIORITY_WAIT); - -restart: - do { - set_current_state(state); - if (intel_wait_update_request(&wait, rq)) - break; - - if (signal_pending_state(state, current)) { - timeout = -ERESTARTSYS; - goto complete; - } - if (!timeout) { - timeout = -ETIME; - goto complete; - } + /* Optimistic short spin before touching IRQs */ + if (__i915_spin_request(rq, state, 5)) + goto out; - timeout = io_schedule_timeout(timeout); - } while (1); + if (flags & I915_WAIT_PRIORITY) + i915_schedule_bump_priority(rq, I915_PRIORITY_WAIT); - GEM_BUG_ON(!intel_wait_has_seqno(&wait)); - GEM_BUG_ON(!i915_sw_fence_signaled(&rq->submit)); + wait.tsk = current; + if (dma_fence_add_callback(&rq->fence, &wait.cb, request_wait_wake)) + goto out; - /* Optimistic short spin before touching IRQs */ - if (__i915_spin_request(rq, wait.seqno, state, 5)) - goto complete; + for (;;) { + set_current_state(state); - set_current_state(state); - if (intel_engine_add_wait(rq->engine, &wait)) - /* - * In order to check that we haven't missed the interrupt - * as we enabled it, we need to kick ourselves to do a - * coherent check on the seqno before we sleep. - */ - goto wakeup; + if (i915_request_completed(rq)) + break; - for (;;) { if (signal_pending_state(state, current)) { timeout = -ERESTARTSYS; break; @@ -1180,33 +1156,13 @@ restart: } timeout = io_schedule_timeout(timeout); - - if (intel_wait_complete(&wait) && - intel_wait_check_request(&wait, rq)) - break; - - set_current_state(state); - -wakeup: - if (i915_request_completed(rq)) - break; - - /* Only spin if we know the GPU is processing this request */ - if (__i915_spin_request(rq, wait.seqno, state, 2)) - break; - - if (!intel_wait_check_request(&wait, rq)) { - intel_engine_remove_wait(rq->engine, &wait); - goto restart; - } } - - intel_engine_remove_wait(rq->engine, &wait); -complete: __set_current_state(TASK_RUNNING); - remove_wait_queue(&rq->execute, &exec); - trace_i915_request_wait_end(rq); + dma_fence_remove_callback(&rq->fence, &wait.cb); + +out: + trace_i915_request_wait_end(rq); return timeout; } diff --git a/drivers/gpu/drm/i915/i915_request.h b/drivers/gpu/drm/i915/i915_request.h index 340d6216791c..3cffb96203b9 100644 --- a/drivers/gpu/drm/i915/i915_request.h +++ b/drivers/gpu/drm/i915/i915_request.h @@ -38,23 +38,34 @@ struct drm_i915_gem_object; struct i915_request; struct i915_timeline; -struct intel_wait { - struct rb_node node; - struct task_struct *tsk; - struct i915_request *request; - u32 seqno; -}; - -struct intel_signal_node { - struct intel_wait wait; - struct list_head link; -}; - struct i915_capture_list { struct i915_capture_list *next; struct i915_vma *vma; }; +enum { + /* + * I915_FENCE_FLAG_ACTIVE - this request is currently submitted to HW. + * + * Set by __i915_request_submit() on handing over to HW, and cleared + * by __i915_request_unsubmit() if we preempt this request. + * + * Finally cleared for consistency on retiring the request, when + * we know the HW is no longer running this request. + * + * See i915_request_is_active() + */ + I915_FENCE_FLAG_ACTIVE = DMA_FENCE_FLAG_USER_BITS, + + /* + * I915_FENCE_FLAG_SIGNAL - this request is currently on signal_list + * + * Internal bookkeeping used by the breadcrumb code to track when + * a request is on the various signal_list. + */ + I915_FENCE_FLAG_SIGNAL, +}; + /** * Request queue structure. * @@ -97,7 +108,7 @@ struct i915_request { struct intel_context *hw_context; struct intel_ring *ring; struct i915_timeline *timeline; - struct intel_signal_node signaling; + struct list_head signal_link; /* * The rcu epoch of when this request was allocated. Used to judiciously @@ -116,7 +127,6 @@ struct i915_request { */ struct i915_sw_fence submit; wait_queue_entry_t submitq; - wait_queue_head_t execute; /* * A list of everyone we wait upon, and everyone who waits upon us. @@ -255,7 +265,7 @@ i915_request_put(struct i915_request *rq) * that it has passed the global seqno and the global seqno is unchanged * after the read, it is indeed complete). */ -static u32 +static inline u32 i915_request_global_seqno(const struct i915_request *request) { return READ_ONCE(request->global_seqno); @@ -277,6 +287,10 @@ void i915_request_skip(struct i915_request *request, int error); void __i915_request_unsubmit(struct i915_request *request); void i915_request_unsubmit(struct i915_request *request); +/* Note: part of the intel_breadcrumbs family */ +bool i915_request_enable_breadcrumb(struct i915_request *request); +void i915_request_cancel_breadcrumb(struct i915_request *request); + long i915_request_wait(struct i915_request *rq, unsigned int flags, long timeout) @@ -293,6 +307,11 @@ static inline bool i915_request_signaled(const struct i915_request *rq) return test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, &rq->fence.flags); } +static inline bool i915_request_is_active(const struct i915_request *rq) +{ + return test_bit(I915_FENCE_FLAG_ACTIVE, &rq->fence.flags); +} + /** * Returns true if seq1 is later than seq2. */ @@ -330,6 +349,11 @@ static inline u32 hwsp_seqno(const struct i915_request *rq) return seqno; } +static inline bool __i915_request_has_started(const struct i915_request *rq) +{ + return i915_seqno_passed(hwsp_seqno(rq), rq->fence.seqno - 1); +} + /** * i915_request_started - check if the request has begun being executed * @rq: the request @@ -345,7 +369,23 @@ static inline bool i915_request_started(const struct i915_request *rq) return true; /* Remember: started but may have since been preempted! */ - return i915_seqno_passed(hwsp_seqno(rq), rq->fence.seqno - 1); + return __i915_request_has_started(rq); +} + +/** + * i915_request_is_running - check if the request may actually be executing + * @rq: the request + * + * Returns true if the request is currently submitted to hardware, has passed + * its start point (i.e. the context is setup and not busywaiting). Note that + * it may no longer be running by the time the function returns! + */ +static inline bool i915_request_is_running(const struct i915_request *rq) +{ + if (!i915_request_is_active(rq)) + return false; + + return __i915_request_has_started(rq); } static inline bool i915_request_completed(const struct i915_request *rq) diff --git a/drivers/gpu/drm/i915/i915_reset.c b/drivers/gpu/drm/i915/i915_reset.c index acf3c777e49d..4462007a681c 100644 --- a/drivers/gpu/drm/i915/i915_reset.c +++ b/drivers/gpu/drm/i915/i915_reset.c @@ -29,7 +29,7 @@ static void engine_skip_context(struct i915_request *rq) spin_lock(&timeline->lock); - if (rq->global_seqno) { + if (i915_request_is_active(rq)) { list_for_each_entry_continue(rq, &engine->timeline.requests, link) if (rq->gem_context == hung_ctx) @@ -751,18 +751,20 @@ static void reset_restart(struct drm_i915_private *i915) static void nop_submit_request(struct i915_request *request) { + struct intel_engine_cs *engine = request->engine; unsigned long flags; GEM_TRACE("%s fence %llx:%lld -> -EIO\n", - request->engine->name, - request->fence.context, request->fence.seqno); + engine->name, request->fence.context, request->fence.seqno); dma_fence_set_error(&request->fence, -EIO); - spin_lock_irqsave(&request->engine->timeline.lock, flags); + spin_lock_irqsave(&engine->timeline.lock, flags); __i915_request_submit(request); i915_request_mark_complete(request); - intel_engine_write_global_seqno(request->engine, request->global_seqno); - spin_unlock_irqrestore(&request->engine->timeline.lock, flags); + intel_engine_write_global_seqno(engine, request->global_seqno); + spin_unlock_irqrestore(&engine->timeline.lock, flags); + + intel_engine_queue_breadcrumbs(engine); } void i915_gem_set_wedged(struct drm_i915_private *i915) @@ -817,7 +819,7 @@ void i915_gem_set_wedged(struct drm_i915_private *i915) for_each_engine(engine, i915, id) { reset_finish_engine(engine); - intel_engine_wakeup(engine); + intel_engine_signal_breadcrumbs(engine); } smp_mb__before_atomic(); diff --git a/drivers/gpu/drm/i915/i915_scheduler.c b/drivers/gpu/drm/i915/i915_scheduler.c index 2d172991024f..d01683167c77 100644 --- a/drivers/gpu/drm/i915/i915_scheduler.c +++ b/drivers/gpu/drm/i915/i915_scheduler.c @@ -243,7 +243,7 @@ static bool inflight(const struct i915_request *rq, { const struct i915_request *active; - if (!rq->global_seqno) + if (!i915_request_is_active(rq)) return false; active = port_request(engine->execlists.port); diff --git a/drivers/gpu/drm/i915/intel_breadcrumbs.c b/drivers/gpu/drm/i915/intel_breadcrumbs.c index b58915b8708b..b0795b0ad227 100644 --- a/drivers/gpu/drm/i915/intel_breadcrumbs.c +++ b/drivers/gpu/drm/i915/intel_breadcrumbs.c @@ -29,48 +29,149 @@ #define task_asleep(tsk) ((tsk)->state & TASK_NORMAL && !(tsk)->on_rq) -static unsigned int __intel_breadcrumbs_wakeup(struct intel_breadcrumbs *b) +static void irq_enable(struct intel_engine_cs *engine) +{ + if (!engine->irq_enable) + return; + + /* Caller disables interrupts */ + spin_lock(&engine->i915->irq_lock); + engine->irq_enable(engine); + spin_unlock(&engine->i915->irq_lock); +} + +static void irq_disable(struct intel_engine_cs *engine) { - struct intel_wait *wait; - unsigned int result = 0; + if (!engine->irq_disable) + return; + + /* Caller disables interrupts */ + spin_lock(&engine->i915->irq_lock); + engine->irq_disable(engine); + spin_unlock(&engine->i915->irq_lock); +} +static void __intel_breadcrumbs_disarm_irq(struct intel_breadcrumbs *b) +{ lockdep_assert_held(&b->irq_lock); - wait = b->irq_wait; - if (wait) { + GEM_BUG_ON(!b->irq_enabled); + if (!--b->irq_enabled) + irq_disable(container_of(b, + struct intel_engine_cs, + breadcrumbs)); + + b->irq_armed = false; +} + +void intel_engine_disarm_breadcrumbs(struct intel_engine_cs *engine) +{ + struct intel_breadcrumbs *b = &engine->breadcrumbs; + + if (!b->irq_armed) + return; + + spin_lock_irq(&b->irq_lock); + if (b->irq_armed) + __intel_breadcrumbs_disarm_irq(b); + spin_unlock_irq(&b->irq_lock); +} + +static inline bool __request_completed(const struct i915_request *rq) +{ + return i915_seqno_passed(__hwsp_seqno(rq), rq->fence.seqno); +} + +bool intel_engine_breadcrumbs_irq(struct intel_engine_cs *engine) +{ + struct intel_breadcrumbs *b = &engine->breadcrumbs; + struct intel_context *ce, *cn; + struct list_head *pos, *next; + LIST_HEAD(signal); + + spin_lock(&b->irq_lock); + + b->irq_fired = true; + if (b->irq_armed && list_empty(&b->signalers)) + __intel_breadcrumbs_disarm_irq(b); + + list_for_each_entry_safe(ce, cn, &b->signalers, signal_link) { + GEM_BUG_ON(list_empty(&ce->signals)); + + list_for_each_safe(pos, next, &ce->signals) { + struct i915_request *rq = + list_entry(pos, typeof(*rq), signal_link); + + if (!__request_completed(rq)) + break; + + GEM_BUG_ON(!test_bit(I915_FENCE_FLAG_SIGNAL, + &rq->fence.flags)); + clear_bit(I915_FENCE_FLAG_SIGNAL, &rq->fence.flags); + + /* + * We may race with direct invocation of + * dma_fence_signal(), e.g. i915_request_retire(), + * in which case we can skip processing it ourselves. + */ + if (test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, + &rq->fence.flags)) + continue; + + /* + * Queue for execution after dropping the signaling + * spinlock as the callback chain may end up adding + * more signalers to the same context or engine. + */ + i915_request_get(rq); + list_add_tail(&rq->signal_link, &signal); + } + /* - * N.B. Since task_asleep() and ttwu are not atomic, the - * waiter may actually go to sleep after the check, causing - * us to suppress a valid wakeup. We prefer to reduce the - * number of false positive missed_breadcrumb() warnings - * at the expense of a few false negatives, as it it easy - * to trigger a false positive under heavy load. Enough - * signal should remain from genuine missed_breadcrumb() - * for us to detect in CI. + * We process the list deletion in bulk, only using a list_add + * (not list_move) above but keeping the status of + * rq->signal_link known with the I915_FENCE_FLAG_SIGNAL bit. */ - bool was_asleep = task_asleep(wait->tsk); + if (!list_is_first(pos, &ce->signals)) { + /* Advance the list to the first incomplete request */ + __list_del_many(&ce->signals, pos); + if (&ce->signals == pos) /* now empty */ + list_del_init(&ce->signal_link); + } + } + + spin_unlock(&b->irq_lock); + + list_for_each_safe(pos, next, &signal) { + struct i915_request *rq = + list_entry(pos, typeof(*rq), signal_link); - result = ENGINE_WAKEUP_WAITER; - if (wake_up_process(wait->tsk) && was_asleep) - result |= ENGINE_WAKEUP_ASLEEP; + dma_fence_signal(&rq->fence); + i915_request_put(rq); } - return result; + return !list_empty(&signal); } -unsigned int intel_engine_wakeup(struct intel_engine_cs *engine) +bool intel_engine_signal_breadcrumbs(struct intel_engine_cs *engine) { - struct intel_breadcrumbs *b = &engine->breadcrumbs; - unsigned long flags; - unsigned int result; + bool result; - spin_lock_irqsave(&b->irq_lock, flags); - result = __intel_breadcrumbs_wakeup(b); - spin_unlock_irqrestore(&b->irq_lock, flags); + local_irq_disable(); + result = intel_engine_breadcrumbs_irq(engine); + local_irq_enable(); return result; } +static void signal_irq_work(struct irq_work *work) +{ + struct intel_engine_cs *engine = + container_of(work, typeof(*engine), breadcrumbs.irq_work); + + intel_engine_breadcrumbs_irq(engine); +} + static unsigned long wait_timeout(void) { return round_jiffies_up(jiffies + DRM_I915_HANGCHECK_JIFFIES); @@ -94,19 +195,15 @@ static void intel_breadcrumbs_hangcheck(struct timer_list *t) struct intel_engine_cs *engine = from_timer(engine, t, breadcrumbs.hangcheck); struct intel_breadcrumbs *b = &engine->breadcrumbs; - unsigned int irq_count; if (!b->irq_armed) return; - irq_count = READ_ONCE(b->irq_count); - if (b->hangcheck_interrupts != irq_count) { - b->hangcheck_interrupts = irq_count; - mod_timer(&b->hangcheck, wait_timeout()); - return; - } + if (b->irq_fired) + goto rearm; - /* We keep the hangcheck timer alive until we disarm the irq, even + /* + * We keep the hangcheck timer alive until we disarm the irq, even * if there are no waiters at present. * * If the waiter was currently running, assume it hasn't had a chance @@ -118,10 +215,13 @@ static void intel_breadcrumbs_hangcheck(struct timer_list *t) * but we still have a waiter. Assuming all batches complete within * DRM_I915_HANGCHECK_JIFFIES [1.5s]! */ - if (intel_engine_wakeup(engine) & ENGINE_WAKEUP_ASLEEP) { + synchronize_hardirq(engine->i915->drm.irq); + if (intel_engine_signal_breadcrumbs(engine)) { missed_breadcrumb(engine); mod_timer(&b->fake_irq, jiffies + 1); } else { +rearm: + b->irq_fired = false; mod_timer(&b->hangcheck, wait_timeout()); } } @@ -140,11 +240,7 @@ static void intel_breadcrumbs_fake_irq(struct timer_list *t) * oldest waiter to do the coherent seqno check. */ - spin_lock_irq(&b->irq_lock); - if (b->irq_armed && !__intel_breadcrumbs_wakeup(b)) - __intel_engine_disarm_breadcrumbs(engine); - spin_unlock_irq(&b->irq_lock); - if (!b->irq_armed) + if (!intel_engine_signal_breadcrumbs(engine) && !b->irq_armed) return; /* If the user has disabled the fake-irq, restore the hangchecking */ @@ -156,43 +252,6 @@ static void intel_breadcrumbs_fake_irq(struct timer_list *t) mod_timer(&b->fake_irq, jiffies + 1); } -static void irq_enable(struct intel_engine_cs *engine) -{ - if (!engine->irq_enable) - return; - - /* Caller disables interrupts */ - spin_lock(&engine->i915->irq_lock); - engine->irq_enable(engine); - spin_unlock(&engine->i915->irq_lock); -} - -static void irq_disable(struct intel_engine_cs *engine) -{ - if (!engine->irq_disable) - return; - - /* Caller disables interrupts */ - spin_lock(&engine->i915->irq_lock); - engine->irq_disable(engine); - spin_unlock(&engine->i915->irq_lock); -} - -void __intel_engine_disarm_breadcrumbs(struct intel_engine_cs *engine) -{ - struct intel_breadcrumbs *b = &engine->breadcrumbs; - - lockdep_assert_held(&b->irq_lock); - GEM_BUG_ON(b->irq_wait); - GEM_BUG_ON(!b->irq_armed); - - GEM_BUG_ON(!b->irq_enabled); - if (!--b->irq_enabled) - irq_disable(engine); - - b->irq_armed = false; -} - void intel_engine_pin_breadcrumbs_irq(struct intel_engine_cs *engine) { struct intel_breadcrumbs *b = &engine->breadcrumbs; @@ -215,40 +274,6 @@ void intel_engine_unpin_breadcrumbs_irq(struct intel_engine_cs *engine) spin_unlock_irq(&b->irq_lock); } -void intel_engine_disarm_breadcrumbs(struct intel_engine_cs *engine) -{ - struct intel_breadcrumbs *b = &engine->breadcrumbs; - struct intel_wait *wait, *n; - - if (!b->irq_armed) - return; - - /* - * We only disarm the irq when we are idle (all requests completed), - * so if the bottom-half remains asleep, it missed the request - * completion. - */ - if (intel_engine_wakeup(engine) & ENGINE_WAKEUP_ASLEEP) - missed_breadcrumb(engine); - - spin_lock_irq(&b->rb_lock); - - spin_lock(&b->irq_lock); - b->irq_wait = NULL; - if (b->irq_armed) - __intel_engine_disarm_breadcrumbs(engine); - spin_unlock(&b->irq_lock); - - rbtree_postorder_for_each_entry_safe(wait, n, &b->waiters, node) { - GEM_BUG_ON(!intel_engine_signaled(engine, wait->seqno)); - RB_CLEAR_NODE(&wait->node); - wake_up_process(wait->tsk); - } - b->waiters = RB_ROOT; - - spin_unlock_irq(&b->rb_lock); -} - static bool use_fake_irq(const struct intel_breadcrumbs *b) { const struct intel_engine_cs *engine = @@ -264,7 +289,7 @@ static bool use_fake_irq(const struct intel_breadcrumbs *b) * engine->seqno_barrier(), a timing error that should be transient * and unlikely to reoccur. */ - return READ_ONCE(b->irq_count) == b->hangcheck_interrupts; + return !b->irq_fired; } static void enable_fake_irq(struct intel_breadcrumbs *b) @@ -276,7 +301,7 @@ static void enable_fake_irq(struct intel_breadcrumbs *b) mod_timer(&b->hangcheck, wait_timeout()); } -static bool __intel_breadcrumbs_enable_irq(struct intel_breadcrumbs *b) +static bool __intel_breadcrumbs_arm_irq(struct intel_breadcrumbs *b) { struct intel_engine_cs *engine = container_of(b, struct intel_engine_cs, breadcrumbs); @@ -315,536 +340,149 @@ static bool __intel_breadcrumbs_enable_irq(struct intel_breadcrumbs *b) return enabled; } -static inline struct intel_wait *to_wait(struct rb_node *node) +void intel_engine_init_breadcrumbs(struct intel_engine_cs *engine) { - return rb_entry(node, struct intel_wait, node); -} + struct intel_breadcrumbs *b = &engine->breadcrumbs; -static inline void __intel_breadcrumbs_finish(struct intel_breadcrumbs *b, - struct intel_wait *wait) -{ - lockdep_assert_held(&b->rb_lock); - GEM_BUG_ON(b->irq_wait == wait); + spin_lock_init(&b->irq_lock); + INIT_LIST_HEAD(&b->signalers); - /* - * This request is completed, so remove it from the tree, mark it as - * complete, and *then* wake up the associated task. N.B. when the - * task wakes up, it will find the empty rb_node, discern that it - * has already been removed from the tree and skip the serialisation - * of the b->rb_lock and b->irq_lock. This means that the destruction - * of the intel_wait is not serialised with the interrupt handler - * by the waiter - it must instead be serialised by the caller. - */ - rb_erase(&wait->node, &b->waiters); - RB_CLEAR_NODE(&wait->node); + init_irq_work(&b->irq_work, signal_irq_work); - if (wait->tsk->state != TASK_RUNNING) - wake_up_process(wait->tsk); /* implicit smp_wmb() */ + timer_setup(&b->fake_irq, intel_breadcrumbs_fake_irq, 0); + timer_setup(&b->hangcheck, intel_breadcrumbs_hangcheck, 0); } -static inline void __intel_breadcrumbs_next(struct intel_engine_cs *engine, - struct rb_node *next) +static void cancel_fake_irq(struct intel_engine_cs *engine) { struct intel_breadcrumbs *b = &engine->breadcrumbs; - spin_lock(&b->irq_lock); - GEM_BUG_ON(!b->irq_armed); - GEM_BUG_ON(!b->irq_wait); - b->irq_wait = to_wait(next); - spin_unlock(&b->irq_lock); - - /* We always wake up the next waiter that takes over as the bottom-half - * as we may delegate not only the irq-seqno barrier to the next waiter - * but also the task of waking up concurrent waiters. - */ - if (next) - wake_up_process(to_wait(next)->tsk); + del_timer_sync(&b->fake_irq); /* may queue b->hangcheck */ + del_timer_sync(&b->hangcheck); + clear_bit(engine->id, &engine->i915->gpu_error.missed_irq_rings); } -static bool __intel_engine_add_wait(struct intel_engine_cs *engine, - struct intel_wait *wait) +void intel_engine_reset_breadcrumbs(struct intel_engine_cs *engine) { struct intel_breadcrumbs *b = &engine->breadcrumbs; - struct rb_node **p, *parent, *completed; - bool first, armed; - u32 seqno; + unsigned long flags; - GEM_BUG_ON(!wait->seqno); + spin_lock_irqsave(&b->irq_lock, flags); - /* Insert the request into the retirement ordered list - * of waiters by walking the rbtree. If we are the oldest - * seqno in the tree (the first to be retired), then - * set ourselves as the bottom-half. - * - * As we descend the tree, prune completed branches since we hold the - * spinlock we know that the first_waiter must be delayed and can - * reduce some of the sequential wake up latency if we take action - * ourselves and wake up the completed tasks in parallel. Also, by - * removing stale elements in the tree, we may be able to reduce the - * ping-pong between the old bottom-half and ourselves as first-waiter. + /* + * Leave the fake_irq timer enabled (if it is running), but clear the + * bit so that it turns itself off on its next wake up and goes back + * to the long hangcheck interval if still required. */ - armed = false; - first = true; - parent = NULL; - completed = NULL; - seqno = intel_engine_get_seqno(engine); - - /* If the request completed before we managed to grab the spinlock, - * return now before adding ourselves to the rbtree. We let the - * current bottom-half handle any pending wakeups and instead - * try and get out of the way quickly. - */ - if (i915_seqno_passed(seqno, wait->seqno)) { - RB_CLEAR_NODE(&wait->node); - return first; - } - - p = &b->waiters.rb_node; - while (*p) { - parent = *p; - if (wait->seqno == to_wait(parent)->seqno) { - /* We have multiple waiters on the same seqno, select - * the highest priority task (that with the smallest - * task->prio) to serve as the bottom-half for this - * group. - */ - if (wait->tsk->prio > to_wait(parent)->tsk->prio) { - p = &parent->rb_right; - first = false; - } else { - p = &parent->rb_left; - } - } else if (i915_seqno_passed(wait->seqno, - to_wait(parent)->seqno)) { - p = &parent->rb_right; - if (i915_seqno_passed(seqno, to_wait(parent)->seqno)) - completed = parent; - else - first = false; - } else { - p = &parent->rb_left; - } - } - rb_link_node(&wait->node, parent, p); - rb_insert_color(&wait->node, &b->waiters); - - if (first) { - spin_lock(&b->irq_lock); - b->irq_wait = wait; - /* After assigning ourselves as the new bottom-half, we must - * perform a cursory check to prevent a missed interrupt. - * Either we miss the interrupt whilst programming the hardware, - * or if there was a previous waiter (for a later seqno) they - * may be woken instead of us (due to the inherent race - * in the unlocked read of b->irq_seqno_bh in the irq handler) - * and so we miss the wake up. - */ - armed = __intel_breadcrumbs_enable_irq(b); - spin_unlock(&b->irq_lock); - } - - if (completed) { - /* Advance the bottom-half (b->irq_wait) before we wake up - * the waiters who may scribble over their intel_wait - * just as the interrupt handler is dereferencing it via - * b->irq_wait. - */ - if (!first) { - struct rb_node *next = rb_next(completed); - GEM_BUG_ON(next == &wait->node); - __intel_breadcrumbs_next(engine, next); - } - - do { - struct intel_wait *crumb = to_wait(completed); - completed = rb_prev(completed); - __intel_breadcrumbs_finish(b, crumb); - } while (completed); - } - - GEM_BUG_ON(!b->irq_wait); - GEM_BUG_ON(!b->irq_armed); - GEM_BUG_ON(rb_first(&b->waiters) != &b->irq_wait->node); - - return armed; -} - -bool intel_engine_add_wait(struct intel_engine_cs *engine, - struct intel_wait *wait) -{ - struct intel_breadcrumbs *b = &engine->breadcrumbs; - bool armed; - - spin_lock_irq(&b->rb_lock); - armed = __intel_engine_add_wait(engine, wait); - spin_unlock_irq(&b->rb_lock); - if (armed) - return armed; - - /* Make the caller recheck if its request has already started. */ - return intel_engine_has_started(engine, wait->seqno); -} - -static inline bool chain_wakeup(struct rb_node *rb, int priority) -{ - return rb && to_wait(rb)->tsk->prio <= priority; -} + clear_bit(engine->id, &engine->i915->gpu_error.missed_irq_rings); -static inline int wakeup_priority(struct intel_breadcrumbs *b, - struct task_struct *tsk) -{ - if (tsk == b->signaler) - return INT_MIN; + if (b->irq_enabled) + irq_enable(engine); else - return tsk->prio; -} - -static void __intel_engine_remove_wait(struct intel_engine_cs *engine, - struct intel_wait *wait) -{ - struct intel_breadcrumbs *b = &engine->breadcrumbs; - - lockdep_assert_held(&b->rb_lock); - - if (RB_EMPTY_NODE(&wait->node)) - goto out; - - if (b->irq_wait == wait) { - const int priority = wakeup_priority(b, wait->tsk); - struct rb_node *next; - - /* We are the current bottom-half. Find the next candidate, - * the first waiter in the queue on the remaining oldest - * request. As multiple seqnos may complete in the time it - * takes us to wake up and find the next waiter, we have to - * wake up that waiter for it to perform its own coherent - * completion check. - */ - next = rb_next(&wait->node); - if (chain_wakeup(next, priority)) { - /* If the next waiter is already complete, - * wake it up and continue onto the next waiter. So - * if have a small herd, they will wake up in parallel - * rather than sequentially, which should reduce - * the overall latency in waking all the completed - * clients. - * - * However, waking up a chain adds extra latency to - * the first_waiter. This is undesirable if that - * waiter is a high priority task. - */ - u32 seqno = intel_engine_get_seqno(engine); - - while (i915_seqno_passed(seqno, to_wait(next)->seqno)) { - struct rb_node *n = rb_next(next); - - __intel_breadcrumbs_finish(b, to_wait(next)); - next = n; - if (!chain_wakeup(next, priority)) - break; - } - } - - __intel_breadcrumbs_next(engine, next); - } else { - GEM_BUG_ON(rb_first(&b->waiters) == &wait->node); - } - - GEM_BUG_ON(RB_EMPTY_NODE(&wait->node)); - rb_erase(&wait->node, &b->waiters); - RB_CLEAR_NODE(&wait->node); + irq_disable(engine); -out: - GEM_BUG_ON(b->irq_wait == wait); - GEM_BUG_ON(rb_first(&b->waiters) != - (b->irq_wait ? &b->irq_wait->node : NULL)); + spin_unlock_irqrestore(&b->irq_lock, flags); } -void intel_engine_remove_wait(struct intel_engine_cs *engine, - struct intel_wait *wait) +void intel_engine_fini_breadcrumbs(struct intel_engine_cs *engine) { - struct intel_breadcrumbs *b = &engine->breadcrumbs; - - /* Quick check to see if this waiter was already decoupled from - * the tree by the bottom-half to avoid contention on the spinlock - * by the herd. - */ - if (RB_EMPTY_NODE(&wait->node)) { - GEM_BUG_ON(READ_ONCE(b->irq_wait) == wait); - return; - } - - spin_lock_irq(&b->rb_lock); - __intel_engine_remove_wait(engine, wait); - spin_unlock_irq(&b->rb_lock); + cancel_fake_irq(engine); } -static void signaler_set_rtpriority(void) +bool i915_request_enable_breadcrumb(struct i915_request *rq) { - struct sched_param param = { .sched_priority = 1 }; - - sched_setscheduler_nocheck(current, SCHED_FIFO, ¶m); -} + struct intel_breadcrumbs *b = &rq->engine->breadcrumbs; -static int intel_breadcrumbs_signaler(void *arg) -{ - struct intel_engine_cs *engine = arg; - struct intel_breadcrumbs *b = &engine->breadcrumbs; - struct i915_request *rq, *n; + GEM_BUG_ON(test_bit(I915_FENCE_FLAG_SIGNAL, &rq->fence.flags)); - /* Install ourselves with high priority to reduce signalling latency */ - signaler_set_rtpriority(); + if (!test_bit(I915_FENCE_FLAG_ACTIVE, &rq->fence.flags)) + return true; - do { - bool do_schedule = true; - LIST_HEAD(list); - u32 seqno; + spin_lock(&b->irq_lock); + if (test_bit(I915_FENCE_FLAG_ACTIVE, &rq->fence.flags) && + !__request_completed(rq)) { + struct intel_context *ce = rq->hw_context; + struct list_head *pos; - set_current_state(TASK_INTERRUPTIBLE); - if (list_empty(&b->signals)) - goto sleep; + __intel_breadcrumbs_arm_irq(b); /* - * We are either woken up by the interrupt bottom-half, - * or by a client adding a new signaller. In both cases, - * the GPU seqno may have advanced beyond our oldest signal. - * If it has, propagate the signal, remove the waiter and - * check again with the next oldest signal. Otherwise we - * need to wait for a new interrupt from the GPU or for - * a new client. + * We keep the seqno in retirement order, so we can break + * inside intel_engine_breadcrumbs_irq as soon as we've passed + * the last completed request (or seen a request that hasn't + * event started). We could iterate the timeline->requests list, + * but keeping a separate signalers_list has the advantage of + * hopefully being much smaller than the full list and so + * provides faster iteration and detection when there are no + * more interrupts required for this context. + * + * We typically expect to add new signalers in order, so we + * start looking for our insertion point from the tail of + * the list. */ - seqno = intel_engine_get_seqno(engine); - - spin_lock_irq(&b->rb_lock); - list_for_each_entry_safe(rq, n, &b->signals, signaling.link) { - u32 this = rq->signaling.wait.seqno; + list_for_each_prev(pos, &ce->signals) { + struct i915_request *it = + list_entry(pos, typeof(*it), signal_link); - GEM_BUG_ON(!rq->signaling.wait.seqno); - - if (!i915_seqno_passed(seqno, this)) + if (i915_seqno_passed(rq->fence.seqno, it->fence.seqno)) break; - - if (likely(this == i915_request_global_seqno(rq))) { - __intel_engine_remove_wait(engine, - &rq->signaling.wait); - - rq->signaling.wait.seqno = 0; - __list_del_entry(&rq->signaling.link); - - if (!i915_request_signaled(rq)) { - list_add_tail(&rq->signaling.link, - &list); - i915_request_get(rq); - } - } } - spin_unlock_irq(&b->rb_lock); - - if (!list_empty(&list)) { - local_bh_disable(); - list_for_each_entry_safe(rq, n, &list, signaling.link) { - dma_fence_signal(&rq->fence); - GEM_BUG_ON(!i915_request_completed(rq)); - i915_request_put(rq); - } - local_bh_enable(); /* kick start the tasklets */ - - /* - * If the engine is saturated we may be continually - * processing completed requests. This angers the - * NMI watchdog if we never let anything else - * have access to the CPU. Let's pretend to be nice - * and relinquish the CPU if we burn through the - * entire RT timeslice! - */ - do_schedule = need_resched(); - } - - if (unlikely(do_schedule)) { -sleep: - if (kthread_should_park()) - kthread_parkme(); - - if (unlikely(kthread_should_stop())) - break; - - schedule(); - } - } while (1); - __set_current_state(TASK_RUNNING); - - return 0; -} + list_add(&rq->signal_link, pos); + if (pos == &ce->signals) /* catch transitions from empty list */ + list_move_tail(&ce->signal_link, &b->signalers); -static void insert_signal(struct intel_breadcrumbs *b, - struct i915_request *request, - const u32 seqno) -{ - struct i915_request *iter; - - lockdep_assert_held(&b->rb_lock); - - /* - * A reasonable assumption is that we are called to add signals - * in sequence, as the requests are submitted for execution and - * assigned a global_seqno. This will be the case for the majority - * of internally generated signals (inter-engine signaling). - * - * Out of order waiters triggering random signaling enabling will - * be more problematic, but hopefully rare enough and the list - * small enough that the O(N) insertion sort is not an issue. - */ - - list_for_each_entry_reverse(iter, &b->signals, signaling.link) - if (i915_seqno_passed(seqno, iter->signaling.wait.seqno)) - break; - - list_add(&request->signaling.link, &iter->signaling.link); -} - -bool intel_engine_enable_signaling(struct i915_request *request, bool wakeup) -{ - struct intel_engine_cs *engine = request->engine; - struct intel_breadcrumbs *b = &engine->breadcrumbs; - struct intel_wait *wait = &request->signaling.wait; - u32 seqno; - - /* - * Note that we may be called from an interrupt handler on another - * device (e.g. nouveau signaling a fence completion causing us - * to submit a request, and so enable signaling). As such, - * we need to make sure that all other users of b->rb_lock protect - * against interrupts, i.e. use spin_lock_irqsave. - */ - - /* locked by dma_fence_enable_sw_signaling() (irqsafe fence->lock) */ - GEM_BUG_ON(!irqs_disabled()); - lockdep_assert_held(&request->lock); - - seqno = i915_request_global_seqno(request); - if (!seqno) /* will be enabled later upon execution */ - return true; - - GEM_BUG_ON(wait->seqno); - wait->tsk = b->signaler; - wait->request = request; - wait->seqno = seqno; - - /* - * Add ourselves into the list of waiters, but registering our - * bottom-half as the signaller thread. As per usual, only the oldest - * waiter (not just signaller) is tasked as the bottom-half waking - * up all completed waiters after the user interrupt. - * - * If we are the oldest waiter, enable the irq (after which we - * must double check that the seqno did not complete). - */ - spin_lock(&b->rb_lock); - insert_signal(b, request, seqno); - wakeup &= __intel_engine_add_wait(engine, wait); - spin_unlock(&b->rb_lock); - - if (wakeup) { - wake_up_process(b->signaler); - return !intel_wait_complete(wait); + set_bit(I915_FENCE_FLAG_SIGNAL, &rq->fence.flags); } + spin_unlock(&b->irq_lock); - return true; + return !__request_completed(rq); } -void intel_engine_cancel_signaling(struct i915_request *request) +void i915_request_cancel_breadcrumb(struct i915_request *rq) { - struct intel_engine_cs *engine = request->engine; - struct intel_breadcrumbs *b = &engine->breadcrumbs; + struct intel_breadcrumbs *b = &rq->engine->breadcrumbs; - GEM_BUG_ON(!irqs_disabled()); - lockdep_assert_held(&request->lock); - - if (!READ_ONCE(request->signaling.wait.seqno)) + if (!test_bit(I915_FENCE_FLAG_SIGNAL, &rq->fence.flags)) return; - spin_lock(&b->rb_lock); - __intel_engine_remove_wait(engine, &request->signaling.wait); - if (fetch_and_zero(&request->signaling.wait.seqno)) - __list_del_entry(&request->signaling.link); - spin_unlock(&b->rb_lock); -} - -int intel_engine_init_breadcrumbs(struct intel_engine_cs *engine) -{ - struct intel_breadcrumbs *b = &engine->breadcrumbs; - struct task_struct *tsk; - - spin_lock_init(&b->rb_lock); - spin_lock_init(&b->irq_lock); - - timer_setup(&b->fake_irq, intel_breadcrumbs_fake_irq, 0); - timer_setup(&b->hangcheck, intel_breadcrumbs_hangcheck, 0); - - INIT_LIST_HEAD(&b->signals); - - /* Spawn a thread to provide a common bottom-half for all signals. - * As this is an asynchronous interface we cannot steal the current - * task for handling the bottom-half to the user interrupt, therefore - * we create a thread to do the coherent seqno dance after the - * interrupt and then signal the waitqueue (via the dma-buf/fence). - */ - tsk = kthread_run(intel_breadcrumbs_signaler, engine, - "i915/signal:%d", engine->id); - if (IS_ERR(tsk)) - return PTR_ERR(tsk); - - b->signaler = tsk; - - return 0; -} + spin_lock(&b->irq_lock); + if (test_bit(I915_FENCE_FLAG_SIGNAL, &rq->fence.flags)) { + struct intel_context *ce = rq->hw_context; -static void cancel_fake_irq(struct intel_engine_cs *engine) -{ - struct intel_breadcrumbs *b = &engine->breadcrumbs; + list_del(&rq->signal_link); + if (list_empty(&ce->signals)) + list_del_init(&ce->signal_link); - del_timer_sync(&b->fake_irq); /* may queue b->hangcheck */ - del_timer_sync(&b->hangcheck); - clear_bit(engine->id, &engine->i915->gpu_error.missed_irq_rings); + clear_bit(I915_FENCE_FLAG_SIGNAL, &rq->fence.flags); + } + spin_unlock(&b->irq_lock); } -void intel_engine_reset_breadcrumbs(struct intel_engine_cs *engine) +void intel_engine_print_breadcrumbs(struct intel_engine_cs *engine, + struct drm_printer *p) { struct intel_breadcrumbs *b = &engine->breadcrumbs; - unsigned long flags; + struct intel_context *ce; + struct i915_request *rq; - spin_lock_irqsave(&b->irq_lock, flags); - - /* - * Leave the fake_irq timer enabled (if it is running), but clear the - * bit so that it turns itself off on its next wake up and goes back - * to the long hangcheck interval if still required. - */ - clear_bit(engine->id, &engine->i915->gpu_error.missed_irq_rings); - - if (b->irq_enabled) - irq_enable(engine); - else - irq_disable(engine); - - spin_unlock_irqrestore(&b->irq_lock, flags); -} - -void intel_engine_fini_breadcrumbs(struct intel_engine_cs *engine) -{ - struct intel_breadcrumbs *b = &engine->breadcrumbs; + if (list_empty(&b->signalers)) + return; - /* The engines should be idle and all requests accounted for! */ - WARN_ON(READ_ONCE(b->irq_wait)); - WARN_ON(!RB_EMPTY_ROOT(&b->waiters)); - WARN_ON(!list_empty(&b->signals)); + drm_printf(p, "Signals:\n"); - if (!IS_ERR_OR_NULL(b->signaler)) - kthread_stop(b->signaler); + spin_lock_irq(&b->irq_lock); + list_for_each_entry(ce, &b->signalers, signal_link) { + list_for_each_entry(rq, &ce->signals, signal_link) { + drm_printf(p, "\t[%llx:%llx%s] @ %dms\n", + rq->fence.context, rq->fence.seqno, + i915_request_completed(rq) ? "!" : + i915_request_started(rq) ? "*" : + "", + jiffies_to_msecs(jiffies - rq->emitted_jiffies)); + } + } + spin_unlock_irq(&b->irq_lock); - cancel_fake_irq(engine); + if (test_bit(engine->id, &engine->i915->gpu_error.missed_irq_rings)) + drm_printf(p, "Fake irq active\n"); } - -#if IS_ENABLED(CONFIG_DRM_I915_SELFTEST) -#include "selftests/intel_breadcrumbs.c" -#endif diff --git a/drivers/gpu/drm/i915/intel_engine_cs.c b/drivers/gpu/drm/i915/intel_engine_cs.c index 0a610c9691fd..71c01eb13af1 100644 --- a/drivers/gpu/drm/i915/intel_engine_cs.c +++ b/drivers/gpu/drm/i915/intel_engine_cs.c @@ -458,12 +458,6 @@ cleanup: void intel_engine_write_global_seqno(struct intel_engine_cs *engine, u32 seqno) { intel_write_status_page(engine, I915_GEM_HWS_INDEX, seqno); - - /* After manually advancing the seqno, fake the interrupt in case - * there are any waiters for that seqno. - */ - intel_engine_wakeup(engine); - GEM_BUG_ON(intel_engine_get_seqno(engine) != seqno); } @@ -607,6 +601,7 @@ int intel_engine_setup_common(struct intel_engine_cs *engine) i915_timeline_set_subclass(&engine->timeline, TIMELINE_ENGINE); + intel_engine_init_breadcrumbs(engine); intel_engine_init_execlist(engine); intel_engine_init_hangcheck(engine); intel_engine_init_batch_pool(engine); @@ -717,20 +712,14 @@ int intel_engine_init_common(struct intel_engine_cs *engine) } } - ret = intel_engine_init_breadcrumbs(engine); - if (ret) - goto err_unpin_preempt; - ret = measure_breadcrumb_dw(engine); if (ret < 0) - goto err_breadcrumbs; + goto err_unpin_preempt; engine->emit_fini_breadcrumb_dw = ret; return 0; -err_breadcrumbs: - intel_engine_fini_breadcrumbs(engine); err_unpin_preempt: if (i915->preempt_context) __intel_context_unpin(i915->preempt_context, engine); @@ -1294,12 +1283,14 @@ static void print_request(struct drm_printer *m, x = print_sched_attr(rq->i915, &rq->sched.attr, buf, x, sizeof(buf)); - drm_printf(m, "%s%x%s [%llx:%llx]%s @ %dms: %s\n", + drm_printf(m, "%s%x%s%s [%llx:%llx]%s @ %dms: %s\n", prefix, rq->global_seqno, i915_request_completed(rq) ? "!" : i915_request_started(rq) ? "*" : "", + test_bit(DMA_FENCE_FLAG_ENABLE_SIGNAL_BIT, + &rq->fence.flags) ? "+" : "", rq->fence.context, rq->fence.seqno, buf, jiffies_to_msecs(jiffies - rq->emitted_jiffies), @@ -1492,12 +1483,9 @@ void intel_engine_dump(struct intel_engine_cs *engine, struct drm_printer *m, const char *header, ...) { - struct intel_breadcrumbs * const b = &engine->breadcrumbs; struct i915_gpu_error * const error = &engine->i915->gpu_error; struct i915_request *rq; intel_wakeref_t wakeref; - unsigned long flags; - struct rb_node *rb; if (header) { va_list ap; @@ -1565,21 +1553,12 @@ void intel_engine_dump(struct intel_engine_cs *engine, intel_execlists_show_requests(engine, m, print_request, 8); - spin_lock_irqsave(&b->rb_lock, flags); - for (rb = rb_first(&b->waiters); rb; rb = rb_next(rb)) { - struct intel_wait *w = rb_entry(rb, typeof(*w), node); - - drm_printf(m, "\t%s [%d:%c] waiting for %x\n", - w->tsk->comm, w->tsk->pid, - task_state_to_char(w->tsk), - w->seqno); - } - spin_unlock_irqrestore(&b->rb_lock, flags); - drm_printf(m, "HWSP:\n"); hexdump(m, engine->status_page.addr, PAGE_SIZE); drm_printf(m, "Idle? %s\n", yesno(intel_engine_is_idle(engine))); + + intel_engine_print_breadcrumbs(engine, m); } static u8 user_class_map[] = { diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c index 668ed67336a2..b889b27f8aeb 100644 --- a/drivers/gpu/drm/i915/intel_ringbuffer.c +++ b/drivers/gpu/drm/i915/intel_ringbuffer.c @@ -743,7 +743,7 @@ static int init_ring_common(struct intel_engine_cs *engine) } /* Papering over lost _interrupts_ immediately following the restart */ - intel_engine_wakeup(engine); + intel_engine_queue_breadcrumbs(engine); out: intel_uncore_forcewake_put(dev_priv, FORCEWAKE_ALL); diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.h b/drivers/gpu/drm/i915/intel_ringbuffer.h index 953ccc2617ff..71f8ceb937ff 100644 --- a/drivers/gpu/drm/i915/intel_ringbuffer.h +++ b/drivers/gpu/drm/i915/intel_ringbuffer.h @@ -5,6 +5,7 @@ #include <drm/drm_util.h> #include <linux/hashtable.h> +#include <linux/irq_work.h> #include <linux/seqlock.h> #include "i915_gem_batch_pool.h" @@ -381,22 +382,19 @@ struct intel_engine_cs { * the overhead of waking that client is much preferred. */ struct intel_breadcrumbs { - spinlock_t irq_lock; /* protects irq_*; irqsafe */ - struct intel_wait *irq_wait; /* oldest waiter by retirement */ + spinlock_t irq_lock; + struct list_head signalers; - spinlock_t rb_lock; /* protects the rb and wraps irq_lock */ - struct rb_root waiters; /* sorted by retirement, priority */ - struct list_head signals; /* sorted by retirement */ - struct task_struct *signaler; /* used for fence signalling */ + struct irq_work irq_work; /* for use from inside irq_lock */ struct timer_list fake_irq; /* used after a missed interrupt */ struct timer_list hangcheck; /* detect missed interrupts */ unsigned int hangcheck_interrupts; unsigned int irq_enabled; - unsigned int irq_count; - bool irq_armed : 1; + bool irq_armed; + bool irq_fired; } breadcrumbs; struct { @@ -885,83 +883,29 @@ static inline bool intel_engine_has_started(struct intel_engine_cs *engine, void intel_engine_get_instdone(struct intel_engine_cs *engine, struct intel_instdone *instdone); -/* intel_breadcrumbs.c -- user interrupt bottom-half for waiters */ -int intel_engine_init_breadcrumbs(struct intel_engine_cs *engine); - -static inline void intel_wait_init(struct intel_wait *wait) -{ - wait->tsk = current; - wait->request = NULL; -} - -static inline void intel_wait_init_for_seqno(struct intel_wait *wait, u32 seqno) -{ - wait->tsk = current; - wait->seqno = seqno; -} - -static inline bool intel_wait_has_seqno(const struct intel_wait *wait) -{ - return wait->seqno; -} - -static inline bool -intel_wait_update_seqno(struct intel_wait *wait, u32 seqno) -{ - wait->seqno = seqno; - return intel_wait_has_seqno(wait); -} - -static inline bool -intel_wait_update_request(struct intel_wait *wait, - const struct i915_request *rq) -{ - return intel_wait_update_seqno(wait, i915_request_global_seqno(rq)); -} - -static inline bool -intel_wait_check_seqno(const struct intel_wait *wait, u32 seqno) -{ - return wait->seqno == seqno; -} - -static inline bool -intel_wait_check_request(const struct intel_wait *wait, - const struct i915_request *rq) -{ - return intel_wait_check_seqno(wait, i915_request_global_seqno(rq)); -} +void intel_engine_init_breadcrumbs(struct intel_engine_cs *engine); +void intel_engine_fini_breadcrumbs(struct intel_engine_cs *engine); -static inline bool intel_wait_complete(const struct intel_wait *wait) -{ - return RB_EMPTY_NODE(&wait->node); -} +void intel_engine_pin_breadcrumbs_irq(struct intel_engine_cs *engine); +void intel_engine_unpin_breadcrumbs_irq(struct intel_engine_cs *engine); -bool intel_engine_add_wait(struct intel_engine_cs *engine, - struct intel_wait *wait); -void intel_engine_remove_wait(struct intel_engine_cs *engine, - struct intel_wait *wait); -bool intel_engine_enable_signaling(struct i915_request *request, bool wakeup); -void intel_engine_cancel_signaling(struct i915_request *request); +bool intel_engine_signal_breadcrumbs(struct intel_engine_cs *engine); +void intel_engine_disarm_breadcrumbs(struct intel_engine_cs *engine); -static inline bool intel_engine_has_waiter(const struct intel_engine_cs *engine) +static inline void +intel_engine_queue_breadcrumbs(struct intel_engine_cs *engine) { - return READ_ONCE(engine->breadcrumbs.irq_wait); + irq_work_queue(&engine->breadcrumbs.irq_work); } -unsigned int intel_engine_wakeup(struct intel_engine_cs *engine); -#define ENGINE_WAKEUP_WAITER BIT(0) -#define ENGINE_WAKEUP_ASLEEP BIT(1) - -void intel_engine_pin_breadcrumbs_irq(struct intel_engine_cs *engine); -void intel_engine_unpin_breadcrumbs_irq(struct intel_engine_cs *engine); - -void __intel_engine_disarm_breadcrumbs(struct intel_engine_cs *engine); -void intel_engine_disarm_breadcrumbs(struct intel_engine_cs *engine); +bool intel_engine_breadcrumbs_irq(struct intel_engine_cs *engine); void intel_engine_reset_breadcrumbs(struct intel_engine_cs *engine); void intel_engine_fini_breadcrumbs(struct intel_engine_cs *engine); +void intel_engine_print_breadcrumbs(struct intel_engine_cs *engine, + struct drm_printer *p); + static inline u32 *gen8_emit_pipe_control(u32 *batch, u32 flags, u32 offset) { memset(batch, 0, 6 * sizeof(u32)); diff --git a/drivers/gpu/drm/i915/selftests/i915_mock_selftests.h b/drivers/gpu/drm/i915/selftests/i915_mock_selftests.h index 4a83a1c6c406..88e5ab586337 100644 --- a/drivers/gpu/drm/i915/selftests/i915_mock_selftests.h +++ b/drivers/gpu/drm/i915/selftests/i915_mock_selftests.h @@ -15,7 +15,6 @@ selftest(scatterlist, scatterlist_mock_selftests) selftest(syncmap, i915_syncmap_mock_selftests) selftest(uncore, intel_uncore_mock_selftests) selftest(engine, intel_engine_cs_mock_selftests) -selftest(breadcrumbs, intel_breadcrumbs_mock_selftests) selftest(timelines, i915_timeline_mock_selftests) selftest(requests, i915_request_mock_selftests) selftest(objects, i915_gem_object_mock_selftests) diff --git a/drivers/gpu/drm/i915/selftests/i915_request.c b/drivers/gpu/drm/i915/selftests/i915_request.c index 4d4b86b5fa11..6733dc5b6b4c 100644 --- a/drivers/gpu/drm/i915/selftests/i915_request.c +++ b/drivers/gpu/drm/i915/selftests/i915_request.c @@ -25,9 +25,12 @@ #include <linux/prime_numbers.h> #include "../i915_selftest.h" +#include "i915_random.h" #include "igt_live_test.h" +#include "lib_sw_fence.h" #include "mock_context.h" +#include "mock_drm.h" #include "mock_gem_device.h" static int igt_add_request(void *arg) @@ -247,6 +250,254 @@ err_context_0: return err; } +struct smoketest { + struct intel_engine_cs *engine; + struct i915_gem_context **contexts; + atomic_long_t num_waits, num_fences; + int ncontexts, max_batch; + struct i915_request *(*request_alloc)(struct i915_gem_context *, + struct intel_engine_cs *); +}; + +static struct i915_request * +__mock_request_alloc(struct i915_gem_context *ctx, + struct intel_engine_cs *engine) +{ + return mock_request(engine, ctx, 0); +} + +static struct i915_request * +__live_request_alloc(struct i915_gem_context *ctx, + struct intel_engine_cs *engine) +{ + return i915_request_alloc(engine, ctx); +} + +static int __igt_breadcrumbs_smoketest(void *arg) +{ + struct smoketest *t = arg; + struct mutex * const BKL = &t->engine->i915->drm.struct_mutex; + const unsigned int max_batch = min(t->ncontexts, t->max_batch) - 1; + const unsigned int total = 4 * t->ncontexts + 1; + unsigned int num_waits = 0, num_fences = 0; + struct i915_request **requests; + I915_RND_STATE(prng); + unsigned int *order; + int err = 0; + + /* + * A very simple test to catch the most egregious of list handling bugs. + * + * At its heart, we simply create oodles of requests running across + * multiple kthreads and enable signaling on them, for the sole purpose + * of stressing our breadcrumb handling. The only inspection we do is + * that the fences were marked as signaled. + */ + + requests = kmalloc_array(total, sizeof(*requests), GFP_KERNEL); + if (!requests) + return -ENOMEM; + + order = i915_random_order(total, &prng); + if (!order) { + err = -ENOMEM; + goto out_requests; + } + + while (!kthread_should_stop()) { + struct i915_sw_fence *submit, *wait; + unsigned int n, count; + + submit = heap_fence_create(GFP_KERNEL); + if (!submit) { + err = -ENOMEM; + break; + } + + wait = heap_fence_create(GFP_KERNEL); + if (!wait) { + i915_sw_fence_commit(submit); + heap_fence_put(submit); + err = ENOMEM; + break; + } + + i915_random_reorder(order, total, &prng); + count = 1 + i915_prandom_u32_max_state(max_batch, &prng); + + for (n = 0; n < count; n++) { + struct i915_gem_context *ctx = + t->contexts[order[n] % t->ncontexts]; + struct i915_request *rq; + + mutex_lock(BKL); + + rq = t->request_alloc(ctx, t->engine); + if (IS_ERR(rq)) { + mutex_unlock(BKL); + err = PTR_ERR(rq); + count = n; + break; + } + + err = i915_sw_fence_await_sw_fence_gfp(&rq->submit, + submit, + GFP_KERNEL); + + requests[n] = i915_request_get(rq); + i915_request_add(rq); + + mutex_unlock(BKL); + + if (err >= 0) + err = i915_sw_fence_await_dma_fence(wait, + &rq->fence, + 0, + GFP_KERNEL); + + if (err < 0) { + i915_request_put(rq); + count = n; + break; + } + } + + i915_sw_fence_commit(submit); + i915_sw_fence_commit(wait); + + if (!wait_event_timeout(wait->wait, + i915_sw_fence_done(wait), + HZ / 2)) { + struct i915_request *rq = requests[count - 1]; + + pr_err("waiting for %d fences (last %llx:%lld) on %s timed out!\n", + count, + rq->fence.context, rq->fence.seqno, + t->engine->name); + i915_gem_set_wedged(t->engine->i915); + GEM_BUG_ON(!i915_request_completed(rq)); + i915_sw_fence_wait(wait); + err = -EIO; + } + + for (n = 0; n < count; n++) { + struct i915_request *rq = requests[n]; + + if (!test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, + &rq->fence.flags)) { + pr_err("%llu:%llu was not signaled!\n", + rq->fence.context, rq->fence.seqno); + err = -EINVAL; + } + + i915_request_put(rq); + } + + heap_fence_put(wait); + heap_fence_put(submit); + + if (err < 0) + break; + + num_fences += count; + num_waits++; + + cond_resched(); + } + + atomic_long_add(num_fences, &t->num_fences); + atomic_long_add(num_waits, &t->num_waits); + + kfree(order); +out_requests: + kfree(requests); + return err; +} + +static int mock_breadcrumbs_smoketest(void *arg) +{ + struct drm_i915_private *i915 = arg; + struct smoketest t = { + .engine = i915->engine[RCS], + .ncontexts = 1024, + .max_batch = 1024, + .request_alloc = __mock_request_alloc + }; + unsigned int ncpus = num_online_cpus(); + struct task_struct **threads; + unsigned int n; + int ret = 0; + + /* + * Smoketest our breadcrumb/signal handling for requests across multiple + * threads. A very simple test to only catch the most egregious of bugs. + * See __igt_breadcrumbs_smoketest(); + */ + + threads = kmalloc_array(ncpus, sizeof(*threads), GFP_KERNEL); + if (!threads) + return -ENOMEM; + + t.contexts = + kmalloc_array(t.ncontexts, sizeof(*t.contexts), GFP_KERNEL); + if (!t.contexts) { + ret = -ENOMEM; + goto out_threads; + } + + mutex_lock(&t.engine->i915->drm.struct_mutex); + for (n = 0; n < t.ncontexts; n++) { + t.contexts[n] = mock_context(t.engine->i915, "mock"); + if (!t.contexts[n]) { + ret = -ENOMEM; + goto out_contexts; + } + } + mutex_unlock(&t.engine->i915->drm.struct_mutex); + + for (n = 0; n < ncpus; n++) { + threads[n] = kthread_run(__igt_breadcrumbs_smoketest, + &t, "igt/%d", n); + if (IS_ERR(threads[n])) { + ret = PTR_ERR(threads[n]); + ncpus = n; + break; + } + + get_task_struct(threads[n]); + } + + msleep(jiffies_to_msecs(i915_selftest.timeout_jiffies)); + + for (n = 0; n < ncpus; n++) { + int err; + + err = kthread_stop(threads[n]); + if (err < 0 && !ret) + ret = err; + + put_task_struct(threads[n]); + } + pr_info("Completed %lu waits for %lu fence across %d cpus\n", + atomic_long_read(&t.num_waits), + atomic_long_read(&t.num_fences), + ncpus); + + mutex_lock(&t.engine->i915->drm.struct_mutex); +out_contexts: + for (n = 0; n < t.ncontexts; n++) { + if (!t.contexts[n]) + break; + mock_context_close(t.contexts[n]); + } + mutex_unlock(&t.engine->i915->drm.struct_mutex); + kfree(t.contexts); +out_threads: + kfree(threads); + + return ret; +} + int i915_request_mock_selftests(void) { static const struct i915_subtest tests[] = { @@ -254,6 +505,7 @@ int i915_request_mock_selftests(void) SUBTEST(igt_wait_request), SUBTEST(igt_fence_wait), SUBTEST(igt_request_rewind), + SUBTEST(mock_breadcrumbs_smoketest), }; struct drm_i915_private *i915; intel_wakeref_t wakeref; @@ -812,6 +1064,178 @@ out_unlock: return err; } +static int +max_batches(struct i915_gem_context *ctx, struct intel_engine_cs *engine) +{ + struct i915_request *rq; + int ret; + + /* + * Before execlists, all contexts share the same ringbuffer. With + * execlists, each context/engine has a separate ringbuffer and + * for the purposes of this test, inexhaustible. + * + * For the global ringbuffer though, we have to be very careful + * that we do not wrap while preventing the execution of requests + * with a unsignaled fence. + */ + if (HAS_EXECLISTS(ctx->i915)) + return INT_MAX; + + rq = i915_request_alloc(engine, ctx); + if (IS_ERR(rq)) { + ret = PTR_ERR(rq); + } else { + int sz; + + ret = rq->ring->size - rq->reserved_space; + i915_request_add(rq); + + sz = rq->ring->emit - rq->head; + if (sz < 0) + sz += rq->ring->size; + ret /= sz; + ret /= 2; /* leave half spare, in case of emergency! */ + } + + return ret; +} + +static int live_breadcrumbs_smoketest(void *arg) +{ + struct drm_i915_private *i915 = arg; + struct smoketest t[I915_NUM_ENGINES]; + unsigned int ncpus = num_online_cpus(); + unsigned long num_waits, num_fences; + struct intel_engine_cs *engine; + struct task_struct **threads; + struct igt_live_test live; + enum intel_engine_id id; + intel_wakeref_t wakeref; + struct drm_file *file; + unsigned int n; + int ret = 0; + + /* + * Smoketest our breadcrumb/signal handling for requests across multiple + * threads. A very simple test to only catch the most egregious of bugs. + * See __igt_breadcrumbs_smoketest(); + * + * On real hardware this time. + */ + + wakeref = intel_runtime_pm_get(i915); + + file = mock_file(i915); + if (IS_ERR(file)) { + ret = PTR_ERR(file); + goto out_rpm; + } + + threads = kcalloc(ncpus * I915_NUM_ENGINES, + sizeof(*threads), + GFP_KERNEL); + if (!threads) { + ret = -ENOMEM; + goto out_file; + } + + memset(&t[0], 0, sizeof(t[0])); + t[0].request_alloc = __live_request_alloc; + t[0].ncontexts = 64; + t[0].contexts = kmalloc_array(t[0].ncontexts, + sizeof(*t[0].contexts), + GFP_KERNEL); + if (!t[0].contexts) { + ret = -ENOMEM; + goto out_threads; + } + + mutex_lock(&i915->drm.struct_mutex); + for (n = 0; n < t[0].ncontexts; n++) { + t[0].contexts[n] = live_context(i915, file); + if (!t[0].contexts[n]) { + ret = -ENOMEM; + goto out_contexts; + } + } + + ret = igt_live_test_begin(&live, i915, __func__, ""); + if (ret) + goto out_contexts; + + for_each_engine(engine, i915, id) { + t[id] = t[0]; + t[id].engine = engine; + t[id].max_batch = max_batches(t[0].contexts[0], engine); + if (t[id].max_batch < 0) { + ret = t[id].max_batch; + mutex_unlock(&i915->drm.struct_mutex); + goto out_flush; + } + /* One ring interleaved between requests from all cpus */ + t[id].max_batch /= num_online_cpus() + 1; + pr_debug("Limiting batches to %d requests on %s\n", + t[id].max_batch, engine->name); + + for (n = 0; n < ncpus; n++) { + struct task_struct *tsk; + + tsk = kthread_run(__igt_breadcrumbs_smoketest, + &t[id], "igt/%d.%d", id, n); + if (IS_ERR(tsk)) { + ret = PTR_ERR(tsk); + mutex_unlock(&i915->drm.struct_mutex); + goto out_flush; + } + + get_task_struct(tsk); + threads[id * ncpus + n] = tsk; + } + } + mutex_unlock(&i915->drm.struct_mutex); + + msleep(jiffies_to_msecs(i915_selftest.timeout_jiffies)); + +out_flush: + num_waits = 0; + num_fences = 0; + for_each_engine(engine, i915, id) { + for (n = 0; n < ncpus; n++) { + struct task_struct *tsk = threads[id * ncpus + n]; + int err; + + if (!tsk) + continue; + + err = kthread_stop(tsk); + if (err < 0 && !ret) + ret = err; + + put_task_struct(tsk); + } + + num_waits += atomic_long_read(&t[id].num_waits); + num_fences += atomic_long_read(&t[id].num_fences); + } + pr_info("Completed %lu waits for %lu fences across %d engines and %d cpus\n", + num_waits, num_fences, RUNTIME_INFO(i915)->num_rings, ncpus); + + mutex_lock(&i915->drm.struct_mutex); + ret = igt_live_test_end(&live) ?: ret; +out_contexts: + mutex_unlock(&i915->drm.struct_mutex); + kfree(t[0].contexts); +out_threads: + kfree(threads); +out_file: + mock_file_free(i915, file); +out_rpm: + intel_runtime_pm_put(i915, wakeref); + + return ret; +} + int i915_request_live_selftests(struct drm_i915_private *i915) { static const struct i915_subtest tests[] = { @@ -819,6 +1243,7 @@ int i915_request_live_selftests(struct drm_i915_private *i915) SUBTEST(live_all_engines), SUBTEST(live_sequential_engines), SUBTEST(live_empty_request), + SUBTEST(live_breadcrumbs_smoketest), }; if (i915_terminally_wedged(&i915->gpu_error)) diff --git a/drivers/gpu/drm/i915/selftests/igt_spinner.c b/drivers/gpu/drm/i915/selftests/igt_spinner.c index 0e70df0230b8..9ebd9225684e 100644 --- a/drivers/gpu/drm/i915/selftests/igt_spinner.c +++ b/drivers/gpu/drm/i915/selftests/igt_spinner.c @@ -185,11 +185,6 @@ void igt_spinner_fini(struct igt_spinner *spin) bool igt_wait_for_spinner(struct igt_spinner *spin, struct i915_request *rq) { - if (!wait_event_timeout(rq->execute, - READ_ONCE(rq->global_seqno), - msecs_to_jiffies(10))) - return false; - return !(wait_for_us(i915_seqno_passed(hws_seqno(spin, rq), rq->fence.seqno), 10) && diff --git a/drivers/gpu/drm/i915/selftests/intel_breadcrumbs.c b/drivers/gpu/drm/i915/selftests/intel_breadcrumbs.c deleted file mode 100644 index f03b407fdbe2..000000000000 --- a/drivers/gpu/drm/i915/selftests/intel_breadcrumbs.c +++ /dev/null @@ -1,470 +0,0 @@ -/* - * Copyright © 2016 Intel Corporation - * - * Permission is hereby granted, free of charge, to any person obtaining a - * copy of this software and associated documentation files (the "Software"), - * to deal in the Software without restriction, including without limitation - * the rights to use, copy, modify, merge, publish, distribute, sublicense, - * and/or sell copies of the Software, and to permit persons to whom the - * Software is furnished to do so, subject to the following conditions: - * - * The above copyright notice and this permission notice (including the next - * paragraph) shall be included in all copies or substantial portions of the - * Software. - * - * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR - * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, - * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL - * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER - * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING - * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS - * IN THE SOFTWARE. - * - */ - -#include "../i915_selftest.h" -#include "i915_random.h" - -#include "mock_gem_device.h" -#include "mock_engine.h" - -static int check_rbtree(struct intel_engine_cs *engine, - const unsigned long *bitmap, - const struct intel_wait *waiters, - const int count) -{ - struct intel_breadcrumbs *b = &engine->breadcrumbs; - struct rb_node *rb; - int n; - - if (&b->irq_wait->node != rb_first(&b->waiters)) { - pr_err("First waiter does not match first element of wait-tree\n"); - return -EINVAL; - } - - n = find_first_bit(bitmap, count); - for (rb = rb_first(&b->waiters); rb; rb = rb_next(rb)) { - struct intel_wait *w = container_of(rb, typeof(*w), node); - int idx = w - waiters; - - if (!test_bit(idx, bitmap)) { - pr_err("waiter[%d, seqno=%d] removed but still in wait-tree\n", - idx, w->seqno); - return -EINVAL; - } - - if (n != idx) { - pr_err("waiter[%d, seqno=%d] does not match expected next element in tree [%d]\n", - idx, w->seqno, n); - return -EINVAL; - } - - n = find_next_bit(bitmap, count, n + 1); - } - - return 0; -} - -static int check_completion(struct intel_engine_cs *engine, - const unsigned long *bitmap, - const struct intel_wait *waiters, - const int count) -{ - int n; - - for (n = 0; n < count; n++) { - if (intel_wait_complete(&waiters[n]) != !!test_bit(n, bitmap)) - continue; - - pr_err("waiter[%d, seqno=%d] is %s, but expected %s\n", - n, waiters[n].seqno, - intel_wait_complete(&waiters[n]) ? "complete" : "active", - test_bit(n, bitmap) ? "active" : "complete"); - return -EINVAL; - } - - return 0; -} - -static int check_rbtree_empty(struct intel_engine_cs *engine) -{ - struct intel_breadcrumbs *b = &engine->breadcrumbs; - - if (b->irq_wait) { - pr_err("Empty breadcrumbs still has a waiter\n"); - return -EINVAL; - } - - if (!RB_EMPTY_ROOT(&b->waiters)) { - pr_err("Empty breadcrumbs, but wait-tree not empty\n"); - return -EINVAL; - } - - return 0; -} - -static int igt_random_insert_remove(void *arg) -{ - const u32 seqno_bias = 0x1000; - I915_RND_STATE(prng); - struct intel_engine_cs *engine = arg; - struct intel_wait *waiters; - const int count = 4096; - unsigned int *order; - unsigned long *bitmap; - int err = -ENOMEM; - int n; - - mock_engine_reset(engine); - - waiters = kvmalloc_array(count, sizeof(*waiters), GFP_KERNEL); - if (!waiters) - goto out_engines; - - bitmap = kcalloc(DIV_ROUND_UP(count, BITS_PER_LONG), sizeof(*bitmap), - GFP_KERNEL); - if (!bitmap) - goto out_waiters; - - order = i915_random_order(count, &prng); - if (!order) - goto out_bitmap; - - for (n = 0; n < count; n++) - intel_wait_init_for_seqno(&waiters[n], seqno_bias + n); - - err = check_rbtree(engine, bitmap, waiters, count); - if (err) - goto out_order; - - /* Add and remove waiters into the rbtree in random order. At each - * step, we verify that the rbtree is correctly ordered. - */ - for (n = 0; n < count; n++) { - int i = order[n]; - - intel_engine_add_wait(engine, &waiters[i]); - __set_bit(i, bitmap); - - err = check_rbtree(engine, bitmap, waiters, count); - if (err) - goto out_order; - } - - i915_random_reorder(order, count, &prng); - for (n = 0; n < count; n++) { - int i = order[n]; - - intel_engine_remove_wait(engine, &waiters[i]); - __clear_bit(i, bitmap); - - err = check_rbtree(engine, bitmap, waiters, count); - if (err) - goto out_order; - } - - err = check_rbtree_empty(engine); -out_order: - kfree(order); -out_bitmap: - kfree(bitmap); -out_waiters: - kvfree(waiters); -out_engines: - mock_engine_flush(engine); - return err; -} - -static int igt_insert_complete(void *arg) -{ - const u32 seqno_bias = 0x1000; - struct intel_engine_cs *engine = arg; - struct intel_wait *waiters; - const int count = 4096; - unsigned long *bitmap; - int err = -ENOMEM; - int n, m; - - mock_engine_reset(engine); - - waiters = kvmalloc_array(count, sizeof(*waiters), GFP_KERNEL); - if (!waiters) - goto out_engines; - - bitmap = kcalloc(DIV_ROUND_UP(count, BITS_PER_LONG), sizeof(*bitmap), - GFP_KERNEL); - if (!bitmap) - goto out_waiters; - - for (n = 0; n < count; n++) { - intel_wait_init_for_seqno(&waiters[n], n + seqno_bias); - intel_engine_add_wait(engine, &waiters[n]); - __set_bit(n, bitmap); - } - err = check_rbtree(engine, bitmap, waiters, count); - if (err) - goto out_bitmap; - - /* On each step, we advance the seqno so that several waiters are then - * complete (we increase the seqno by increasingly larger values to - * retire more and more waiters at once). All retired waiters should - * be woken and removed from the rbtree, and so that we check. - */ - for (n = 0; n < count; n = m) { - int seqno = 2 * n; - - GEM_BUG_ON(find_first_bit(bitmap, count) != n); - - if (intel_wait_complete(&waiters[n])) { - pr_err("waiter[%d, seqno=%d] completed too early\n", - n, waiters[n].seqno); - err = -EINVAL; - goto out_bitmap; - } - - /* complete the following waiters */ - mock_seqno_advance(engine, seqno + seqno_bias); - for (m = n; m <= seqno; m++) { - if (m == count) - break; - - GEM_BUG_ON(!test_bit(m, bitmap)); - __clear_bit(m, bitmap); - } - - intel_engine_remove_wait(engine, &waiters[n]); - RB_CLEAR_NODE(&waiters[n].node); - - err = check_rbtree(engine, bitmap, waiters, count); - if (err) { - pr_err("rbtree corrupt after seqno advance to %d\n", - seqno + seqno_bias); - goto out_bitmap; - } - - err = check_completion(engine, bitmap, waiters, count); - if (err) { - pr_err("completions after seqno advance to %d failed\n", - seqno + seqno_bias); - goto out_bitmap; - } - } - - err = check_rbtree_empty(engine); -out_bitmap: - kfree(bitmap); -out_waiters: - kvfree(waiters); -out_engines: - mock_engine_flush(engine); - return err; -} - -struct igt_wakeup { - struct task_struct *tsk; - atomic_t *ready, *set, *done; - struct intel_engine_cs *engine; - unsigned long flags; -#define STOP 0 -#define IDLE 1 - wait_queue_head_t *wq; - u32 seqno; -}; - -static bool wait_for_ready(struct igt_wakeup *w) -{ - DEFINE_WAIT(ready); - - set_bit(IDLE, &w->flags); - if (atomic_dec_and_test(w->done)) - wake_up_var(w->done); - - if (test_bit(STOP, &w->flags)) - goto out; - - for (;;) { - prepare_to_wait(w->wq, &ready, TASK_INTERRUPTIBLE); - if (atomic_read(w->ready) == 0) - break; - - schedule(); - } - finish_wait(w->wq, &ready); - -out: - clear_bit(IDLE, &w->flags); - if (atomic_dec_and_test(w->set)) - wake_up_var(w->set); - - return !test_bit(STOP, &w->flags); -} - -static int igt_wakeup_thread(void *arg) -{ - struct igt_wakeup *w = arg; - struct intel_wait wait; - - while (wait_for_ready(w)) { - GEM_BUG_ON(kthread_should_stop()); - - intel_wait_init_for_seqno(&wait, w->seqno); - intel_engine_add_wait(w->engine, &wait); - for (;;) { - set_current_state(TASK_UNINTERRUPTIBLE); - if (i915_seqno_passed(intel_engine_get_seqno(w->engine), - w->seqno)) - break; - - if (test_bit(STOP, &w->flags)) /* emergency escape */ - break; - - schedule(); - } - intel_engine_remove_wait(w->engine, &wait); - __set_current_state(TASK_RUNNING); - } - - return 0; -} - -static void igt_wake_all_sync(atomic_t *ready, - atomic_t *set, - atomic_t *done, - wait_queue_head_t *wq, - int count) -{ - atomic_set(set, count); - atomic_set(ready, 0); - wake_up_all(wq); - - wait_var_event(set, !atomic_read(set)); - atomic_set(ready, count); - atomic_set(done, count); -} - -static int igt_wakeup(void *arg) -{ - I915_RND_STATE(prng); - struct intel_engine_cs *engine = arg; - struct igt_wakeup *waiters; - DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq); - const int count = 4096; - const u32 max_seqno = count / 4; - atomic_t ready, set, done; - int err = -ENOMEM; - int n, step; - - mock_engine_reset(engine); - - waiters = kvmalloc_array(count, sizeof(*waiters), GFP_KERNEL); - if (!waiters) - goto out_engines; - - /* Create a large number of threads, each waiting on a random seqno. - * Multiple waiters will be waiting for the same seqno. - */ - atomic_set(&ready, count); - for (n = 0; n < count; n++) { - waiters[n].wq = &wq; - waiters[n].ready = &ready; - waiters[n].set = &set; - waiters[n].done = &done; - waiters[n].engine = engine; - waiters[n].flags = BIT(IDLE); - - waiters[n].tsk = kthread_run(igt_wakeup_thread, &waiters[n], - "i915/igt:%d", n); - if (IS_ERR(waiters[n].tsk)) - goto out_waiters; - - get_task_struct(waiters[n].tsk); - } - - for (step = 1; step <= max_seqno; step <<= 1) { - u32 seqno; - - /* The waiter threads start paused as we assign them a random - * seqno and reset the engine. Once the engine is reset, - * we signal that the threads may begin their wait upon their - * seqno. - */ - for (n = 0; n < count; n++) { - GEM_BUG_ON(!test_bit(IDLE, &waiters[n].flags)); - waiters[n].seqno = - 1 + prandom_u32_state(&prng) % max_seqno; - } - mock_seqno_advance(engine, 0); - igt_wake_all_sync(&ready, &set, &done, &wq, count); - - /* Simulate the GPU doing chunks of work, with one or more - * seqno appearing to finish at the same time. A random number - * of threads will be waiting upon the update and hopefully be - * woken. - */ - for (seqno = 1; seqno <= max_seqno + step; seqno += step) { - usleep_range(50, 500); - mock_seqno_advance(engine, seqno); - } - GEM_BUG_ON(intel_engine_get_seqno(engine) < 1 + max_seqno); - - /* With the seqno now beyond any of the waiting threads, they - * should all be woken, see that they are complete and signal - * that they are ready for the next test. We wait until all - * threads are complete and waiting for us (i.e. not a seqno). - */ - if (!wait_var_event_timeout(&done, - !atomic_read(&done), 10 * HZ)) { - pr_err("Timed out waiting for %d remaining waiters\n", - atomic_read(&done)); - err = -ETIMEDOUT; - break; - } - - err = check_rbtree_empty(engine); - if (err) - break; - } - -out_waiters: - for (n = 0; n < count; n++) { - if (IS_ERR(waiters[n].tsk)) - break; - - set_bit(STOP, &waiters[n].flags); - } - mock_seqno_advance(engine, INT_MAX); /* wakeup any broken waiters */ - igt_wake_all_sync(&ready, &set, &done, &wq, n); - - for (n = 0; n < count; n++) { - if (IS_ERR(waiters[n].tsk)) - break; - - kthread_stop(waiters[n].tsk); - put_task_struct(waiters[n].tsk); - } - - kvfree(waiters); -out_engines: - mock_engine_flush(engine); - return err; -} - -int intel_breadcrumbs_mock_selftests(void) -{ - static const struct i915_subtest tests[] = { - SUBTEST(igt_random_insert_remove), - SUBTEST(igt_insert_complete), - SUBTEST(igt_wakeup), - }; - struct drm_i915_private *i915; - int err; - - i915 = mock_gem_device(); - if (!i915) - return -ENOMEM; - - err = i915_subtests(tests, i915->engine[RCS]); - drm_dev_put(&i915->drm); - - return err; -} diff --git a/drivers/gpu/drm/i915/selftests/intel_hangcheck.c b/drivers/gpu/drm/i915/selftests/intel_hangcheck.c index 2c38ea5892d9..7b6f3bea9ef8 100644 --- a/drivers/gpu/drm/i915/selftests/intel_hangcheck.c +++ b/drivers/gpu/drm/i915/selftests/intel_hangcheck.c @@ -1127,7 +1127,7 @@ static int __igt_reset_evict_vma(struct drm_i915_private *i915, wait_for_completion(&arg.completion); - if (wait_for(waitqueue_active(&rq->execute), 10)) { + if (wait_for(!list_empty(&rq->fence.cb_list), 10)) { struct drm_printer p = drm_info_printer(i915->drm.dev); pr_err("igt/evict_vma kthread did not wait\n"); diff --git a/drivers/gpu/drm/i915/selftests/lib_sw_fence.c b/drivers/gpu/drm/i915/selftests/lib_sw_fence.c index b26f07b55d86..2bfa72c1654b 100644 --- a/drivers/gpu/drm/i915/selftests/lib_sw_fence.c +++ b/drivers/gpu/drm/i915/selftests/lib_sw_fence.c @@ -76,3 +76,57 @@ void timed_fence_fini(struct timed_fence *tf) destroy_timer_on_stack(&tf->timer); i915_sw_fence_fini(&tf->fence); } + +struct heap_fence { + struct i915_sw_fence fence; + union { + struct kref ref; + struct rcu_head rcu; + }; +}; + +static int __i915_sw_fence_call +heap_fence_notify(struct i915_sw_fence *fence, enum i915_sw_fence_notify state) +{ + struct heap_fence *h = container_of(fence, typeof(*h), fence); + + switch (state) { + case FENCE_COMPLETE: + break; + + case FENCE_FREE: + heap_fence_put(&h->fence); + } + + return NOTIFY_DONE; +} + +struct i915_sw_fence *heap_fence_create(gfp_t gfp) +{ + struct heap_fence *h; + + h = kmalloc(sizeof(*h), gfp); + if (!h) + return NULL; + + i915_sw_fence_init(&h->fence, heap_fence_notify); + refcount_set(&h->ref.refcount, 2); + + return &h->fence; +} + +static void heap_fence_release(struct kref *ref) +{ + struct heap_fence *h = container_of(ref, typeof(*h), ref); + + i915_sw_fence_fini(&h->fence); + + kfree_rcu(h, rcu); +} + +void heap_fence_put(struct i915_sw_fence *fence) +{ + struct heap_fence *h = container_of(fence, typeof(*h), fence); + + kref_put(&h->ref, heap_fence_release); +} diff --git a/drivers/gpu/drm/i915/selftests/lib_sw_fence.h b/drivers/gpu/drm/i915/selftests/lib_sw_fence.h index 474aafb92ae1..1f9927e10f3a 100644 --- a/drivers/gpu/drm/i915/selftests/lib_sw_fence.h +++ b/drivers/gpu/drm/i915/selftests/lib_sw_fence.h @@ -39,4 +39,7 @@ struct timed_fence { void timed_fence_init(struct timed_fence *tf, unsigned long expires); void timed_fence_fini(struct timed_fence *tf); +struct i915_sw_fence *heap_fence_create(gfp_t gfp); +void heap_fence_put(struct i915_sw_fence *fence); + #endif /* _LIB_SW_FENCE_H_ */ diff --git a/drivers/gpu/drm/i915/selftests/mock_engine.c b/drivers/gpu/drm/i915/selftests/mock_engine.c index 3b226ebc6bc4..08f0cab02e0f 100644 --- a/drivers/gpu/drm/i915/selftests/mock_engine.c +++ b/drivers/gpu/drm/i915/selftests/mock_engine.c @@ -86,17 +86,21 @@ static struct mock_request *first_request(struct mock_engine *engine) static void advance(struct mock_request *request) { list_del_init(&request->link); - mock_seqno_advance(request->base.engine, request->base.global_seqno); + intel_engine_write_global_seqno(request->base.engine, + request->base.global_seqno); i915_request_mark_complete(&request->base); GEM_BUG_ON(!i915_request_completed(&request->base)); + + intel_engine_queue_breadcrumbs(request->base.engine); } static void hw_delay_complete(struct timer_list *t) { struct mock_engine *engine = from_timer(engine, t, hw_delay); struct mock_request *request; + unsigned long flags; - spin_lock(&engine->hw_lock); + spin_lock_irqsave(&engine->hw_lock, flags); /* Timer fired, first request is complete */ request = first_request(engine); @@ -116,7 +120,7 @@ static void hw_delay_complete(struct timer_list *t) advance(request); } - spin_unlock(&engine->hw_lock); + spin_unlock_irqrestore(&engine->hw_lock, flags); } static void mock_context_unpin(struct intel_context *ce) @@ -191,11 +195,12 @@ static void mock_submit_request(struct i915_request *request) struct mock_request *mock = container_of(request, typeof(*mock), base); struct mock_engine *engine = container_of(request->engine, typeof(*engine), base); + unsigned long flags; i915_request_submit(request); GEM_BUG_ON(!request->global_seqno); - spin_lock_irq(&engine->hw_lock); + spin_lock_irqsave(&engine->hw_lock, flags); list_add_tail(&mock->link, &engine->hw_queue); if (mock->link.prev == &engine->hw_queue) { if (mock->delay) @@ -203,7 +208,7 @@ static void mock_submit_request(struct i915_request *request) else advance(mock); } - spin_unlock_irq(&engine->hw_lock); + spin_unlock_irqrestore(&engine->hw_lock, flags); } struct intel_engine_cs *mock_engine(struct drm_i915_private *i915, @@ -273,7 +278,7 @@ void mock_engine_flush(struct intel_engine_cs *engine) void mock_engine_reset(struct intel_engine_cs *engine) { - intel_write_status_page(engine, I915_GEM_HWS_INDEX, 0); + intel_engine_write_global_seqno(engine, 0); } void mock_engine_free(struct intel_engine_cs *engine) diff --git a/drivers/gpu/drm/i915/selftests/mock_engine.h b/drivers/gpu/drm/i915/selftests/mock_engine.h index 133d0c21790d..b9cc3a245f16 100644 --- a/drivers/gpu/drm/i915/selftests/mock_engine.h +++ b/drivers/gpu/drm/i915/selftests/mock_engine.h @@ -46,10 +46,4 @@ void mock_engine_flush(struct intel_engine_cs *engine); void mock_engine_reset(struct intel_engine_cs *engine); void mock_engine_free(struct intel_engine_cs *engine); -static inline void mock_seqno_advance(struct intel_engine_cs *engine, u32 seqno) -{ - intel_write_status_page(engine, I915_GEM_HWS_INDEX, seqno); - intel_engine_wakeup(engine); -} - #endif /* !__MOCK_ENGINE_H__ */ |