diff options
Diffstat (limited to 'drivers/gpu/drm/i915/gt/intel_gt_requests.c')
| -rw-r--r-- | drivers/gpu/drm/i915/gt/intel_gt_requests.c | 262 |
1 files changed, 262 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/gt/intel_gt_requests.c b/drivers/gpu/drm/i915/gt/intel_gt_requests.c new file mode 100644 index 000000000..1dfd01668 --- /dev/null +++ b/drivers/gpu/drm/i915/gt/intel_gt_requests.c @@ -0,0 +1,262 @@ +// SPDX-License-Identifier: MIT +/* + * Copyright © 2019 Intel Corporation + */ + +#include <linux/workqueue.h> + +#include "i915_drv.h" /* for_each_engine() */ +#include "i915_request.h" +#include "intel_engine_heartbeat.h" +#include "intel_execlists_submission.h" +#include "intel_gt.h" +#include "intel_gt_pm.h" +#include "intel_gt_requests.h" +#include "intel_timeline.h" + +static bool retire_requests(struct intel_timeline *tl) +{ + struct i915_request *rq, *rn; + + list_for_each_entry_safe(rq, rn, &tl->requests, link) + if (!i915_request_retire(rq)) + return false; + + /* And check nothing new was submitted */ + return !i915_active_fence_isset(&tl->last_request); +} + +static bool engine_active(const struct intel_engine_cs *engine) +{ + return !list_empty(&engine->kernel_context->timeline->requests); +} + +static bool flush_submission(struct intel_gt *gt, long timeout) +{ + struct intel_engine_cs *engine; + enum intel_engine_id id; + bool active = false; + + if (!timeout) + return false; + + if (!intel_gt_pm_is_awake(gt)) + return false; + + for_each_engine(engine, gt, id) { + intel_engine_flush_submission(engine); + + /* Flush the background retirement and idle barriers */ + flush_work(&engine->retire_work); + flush_delayed_work(&engine->wakeref.work); + + /* Is the idle barrier still outstanding? */ + active |= engine_active(engine); + } + + return active; +} + +static void engine_retire(struct work_struct *work) +{ + struct intel_engine_cs *engine = + container_of(work, typeof(*engine), retire_work); + struct intel_timeline *tl = xchg(&engine->retire, NULL); + + do { + struct intel_timeline *next = xchg(&tl->retire, NULL); + + /* + * Our goal here is to retire _idle_ timelines as soon as + * possible (as they are idle, we do not expect userspace + * to be cleaning up anytime soon). + * + * If the timeline is currently locked, either it is being + * retired elsewhere or about to be! + */ + if (mutex_trylock(&tl->mutex)) { + retire_requests(tl); + mutex_unlock(&tl->mutex); + } + intel_timeline_put(tl); + + GEM_BUG_ON(!next); + tl = ptr_mask_bits(next, 1); + } while (tl); +} + +static bool add_retire(struct intel_engine_cs *engine, + struct intel_timeline *tl) +{ +#define STUB ((struct intel_timeline *)1) + struct intel_timeline *first; + + /* + * We open-code a llist here to include the additional tag [BIT(0)] + * so that we know when the timeline is already on a + * retirement queue: either this engine or another. + */ + + if (cmpxchg(&tl->retire, NULL, STUB)) /* already queued */ + return false; + + intel_timeline_get(tl); + first = READ_ONCE(engine->retire); + do + tl->retire = ptr_pack_bits(first, 1, 1); + while (!try_cmpxchg(&engine->retire, &first, tl)); + + return !first; +} + +void intel_engine_add_retire(struct intel_engine_cs *engine, + struct intel_timeline *tl) +{ + /* We don't deal well with the engine disappearing beneath us */ + GEM_BUG_ON(intel_engine_is_virtual(engine)); + + if (add_retire(engine, tl)) + schedule_work(&engine->retire_work); +} + +void intel_engine_init_retire(struct intel_engine_cs *engine) +{ + INIT_WORK(&engine->retire_work, engine_retire); +} + +void intel_engine_fini_retire(struct intel_engine_cs *engine) +{ + flush_work(&engine->retire_work); + GEM_BUG_ON(engine->retire); +} + +long intel_gt_retire_requests_timeout(struct intel_gt *gt, long timeout, + long *remaining_timeout) +{ + struct intel_gt_timelines *timelines = >->timelines; + struct intel_timeline *tl, *tn; + unsigned long active_count = 0; + LIST_HEAD(free); + + flush_submission(gt, timeout); /* kick the ksoftirqd tasklets */ + spin_lock(&timelines->lock); + list_for_each_entry_safe(tl, tn, &timelines->active_list, link) { + if (!mutex_trylock(&tl->mutex)) { + active_count++; /* report busy to caller, try again? */ + continue; + } + + intel_timeline_get(tl); + GEM_BUG_ON(!atomic_read(&tl->active_count)); + atomic_inc(&tl->active_count); /* pin the list element */ + spin_unlock(&timelines->lock); + + if (timeout > 0) { + struct dma_fence *fence; + + fence = i915_active_fence_get(&tl->last_request); + if (fence) { + mutex_unlock(&tl->mutex); + + timeout = dma_fence_wait_timeout(fence, + true, + timeout); + dma_fence_put(fence); + + /* Retirement is best effort */ + if (!mutex_trylock(&tl->mutex)) { + active_count++; + goto out_active; + } + } + } + + if (!retire_requests(tl)) + active_count++; + mutex_unlock(&tl->mutex); + +out_active: spin_lock(&timelines->lock); + + /* Resume list iteration after reacquiring spinlock */ + list_safe_reset_next(tl, tn, link); + if (atomic_dec_and_test(&tl->active_count)) + list_del(&tl->link); + + /* Defer the final release to after the spinlock */ + if (refcount_dec_and_test(&tl->kref.refcount)) { + GEM_BUG_ON(atomic_read(&tl->active_count)); + list_add(&tl->link, &free); + } + } + spin_unlock(&timelines->lock); + + list_for_each_entry_safe(tl, tn, &free, link) + __intel_timeline_free(&tl->kref); + + if (flush_submission(gt, timeout)) /* Wait, there's more! */ + active_count++; + + if (remaining_timeout) + *remaining_timeout = timeout; + + return active_count ? timeout ?: -ETIME : 0; +} + +static void retire_work_handler(struct work_struct *work) +{ + struct intel_gt *gt = + container_of(work, typeof(*gt), requests.retire_work.work); + + schedule_delayed_work(>->requests.retire_work, + round_jiffies_up_relative(HZ)); + intel_gt_retire_requests(gt); +} + +void intel_gt_init_requests(struct intel_gt *gt) +{ + INIT_DELAYED_WORK(>->requests.retire_work, retire_work_handler); +} + +void intel_gt_park_requests(struct intel_gt *gt) +{ + cancel_delayed_work(>->requests.retire_work); +} + +void intel_gt_unpark_requests(struct intel_gt *gt) +{ + schedule_delayed_work(>->requests.retire_work, + round_jiffies_up_relative(HZ)); +} + +void intel_gt_fini_requests(struct intel_gt *gt) +{ + /* Wait until the work is marked as finished before unloading! */ + cancel_delayed_work_sync(>->requests.retire_work); + + flush_work(>->watchdog.work); +} + +void intel_gt_watchdog_work(struct work_struct *work) +{ + struct intel_gt *gt = + container_of(work, typeof(*gt), watchdog.work); + struct i915_request *rq, *rn; + struct llist_node *first; + + first = llist_del_all(>->watchdog.list); + if (!first) + return; + + llist_for_each_entry_safe(rq, rn, first, watchdog.link) { + if (!i915_request_completed(rq)) { + struct dma_fence *f = &rq->fence; + + pr_notice("Fence expiration time out i915-%s:%s:%llx!\n", + f->ops->get_driver_name(f), + f->ops->get_timeline_name(f), + f->seqno); + i915_request_cancel(rq, -EINTR); + } + i915_request_put(rq); + } +} |