diff options
Diffstat (limited to 'drivers/gpu/drm/i915/gt/intel_context.c')
| -rw-r--r-- | drivers/gpu/drm/i915/gt/intel_context.c | 631 |
1 files changed, 631 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/gt/intel_context.c b/drivers/gpu/drm/i915/gt/intel_context.c new file mode 100644 index 000000000..2aa63ec52 --- /dev/null +++ b/drivers/gpu/drm/i915/gt/intel_context.c @@ -0,0 +1,631 @@ +// SPDX-License-Identifier: MIT +/* + * Copyright © 2019 Intel Corporation + */ + +#include "gem/i915_gem_context.h" +#include "gem/i915_gem_pm.h" + +#include "i915_drv.h" +#include "i915_trace.h" + +#include "intel_context.h" +#include "intel_engine.h" +#include "intel_engine_pm.h" +#include "intel_ring.h" + +static struct kmem_cache *slab_ce; + +static struct intel_context *intel_context_alloc(void) +{ + return kmem_cache_zalloc(slab_ce, GFP_KERNEL); +} + +static void rcu_context_free(struct rcu_head *rcu) +{ + struct intel_context *ce = container_of(rcu, typeof(*ce), rcu); + + trace_intel_context_free(ce); + kmem_cache_free(slab_ce, ce); +} + +void intel_context_free(struct intel_context *ce) +{ + call_rcu(&ce->rcu, rcu_context_free); +} + +struct intel_context * +intel_context_create(struct intel_engine_cs *engine) +{ + struct intel_context *ce; + + ce = intel_context_alloc(); + if (!ce) + return ERR_PTR(-ENOMEM); + + intel_context_init(ce, engine); + trace_intel_context_create(ce); + return ce; +} + +int intel_context_alloc_state(struct intel_context *ce) +{ + int err = 0; + + if (mutex_lock_interruptible(&ce->pin_mutex)) + return -EINTR; + + if (!test_bit(CONTEXT_ALLOC_BIT, &ce->flags)) { + if (intel_context_is_banned(ce)) { + err = -EIO; + goto unlock; + } + + err = ce->ops->alloc(ce); + if (unlikely(err)) + goto unlock; + + set_bit(CONTEXT_ALLOC_BIT, &ce->flags); + } + +unlock: + mutex_unlock(&ce->pin_mutex); + return err; +} + +static int intel_context_active_acquire(struct intel_context *ce) +{ + int err; + + __i915_active_acquire(&ce->active); + + if (intel_context_is_barrier(ce) || intel_engine_uses_guc(ce->engine) || + intel_context_is_parallel(ce)) + return 0; + + /* Preallocate tracking nodes */ + err = i915_active_acquire_preallocate_barrier(&ce->active, + ce->engine); + if (err) + i915_active_release(&ce->active); + + return err; +} + +static void intel_context_active_release(struct intel_context *ce) +{ + /* Nodes preallocated in intel_context_active() */ + i915_active_acquire_barrier(&ce->active); + i915_active_release(&ce->active); +} + +static int __context_pin_state(struct i915_vma *vma, struct i915_gem_ww_ctx *ww) +{ + unsigned int bias = i915_ggtt_pin_bias(vma) | PIN_OFFSET_BIAS; + int err; + + err = i915_ggtt_pin(vma, ww, 0, bias | PIN_HIGH); + if (err) + return err; + + err = i915_active_acquire(&vma->active); + if (err) + goto err_unpin; + + /* + * And mark it as a globally pinned object to let the shrinker know + * it cannot reclaim the object until we release it. + */ + i915_vma_make_unshrinkable(vma); + vma->obj->mm.dirty = true; + + return 0; + +err_unpin: + i915_vma_unpin(vma); + return err; +} + +static void __context_unpin_state(struct i915_vma *vma) +{ + i915_vma_make_shrinkable(vma); + i915_active_release(&vma->active); + __i915_vma_unpin(vma); +} + +static int __ring_active(struct intel_ring *ring, + struct i915_gem_ww_ctx *ww) +{ + int err; + + err = intel_ring_pin(ring, ww); + if (err) + return err; + + err = i915_active_acquire(&ring->vma->active); + if (err) + goto err_pin; + + return 0; + +err_pin: + intel_ring_unpin(ring); + return err; +} + +static void __ring_retire(struct intel_ring *ring) +{ + i915_active_release(&ring->vma->active); + intel_ring_unpin(ring); +} + +static int intel_context_pre_pin(struct intel_context *ce, + struct i915_gem_ww_ctx *ww) +{ + int err; + + CE_TRACE(ce, "active\n"); + + err = __ring_active(ce->ring, ww); + if (err) + return err; + + err = intel_timeline_pin(ce->timeline, ww); + if (err) + goto err_ring; + + if (!ce->state) + return 0; + + err = __context_pin_state(ce->state, ww); + if (err) + goto err_timeline; + + + return 0; + +err_timeline: + intel_timeline_unpin(ce->timeline); +err_ring: + __ring_retire(ce->ring); + return err; +} + +static void intel_context_post_unpin(struct intel_context *ce) +{ + if (ce->state) + __context_unpin_state(ce->state); + + intel_timeline_unpin(ce->timeline); + __ring_retire(ce->ring); +} + +int __intel_context_do_pin_ww(struct intel_context *ce, + struct i915_gem_ww_ctx *ww) +{ + bool handoff = false; + void *vaddr; + int err = 0; + + if (unlikely(!test_bit(CONTEXT_ALLOC_BIT, &ce->flags))) { + err = intel_context_alloc_state(ce); + if (err) + return err; + } + + /* + * We always pin the context/ring/timeline here, to ensure a pin + * refcount for __intel_context_active(), which prevent a lock + * inversion of ce->pin_mutex vs dma_resv_lock(). + */ + + err = i915_gem_object_lock(ce->timeline->hwsp_ggtt->obj, ww); + if (!err) + err = i915_gem_object_lock(ce->ring->vma->obj, ww); + if (!err && ce->state) + err = i915_gem_object_lock(ce->state->obj, ww); + if (!err) + err = intel_context_pre_pin(ce, ww); + if (err) + return err; + + err = ce->ops->pre_pin(ce, ww, &vaddr); + if (err) + goto err_ctx_unpin; + + err = i915_active_acquire(&ce->active); + if (err) + goto err_post_unpin; + + err = mutex_lock_interruptible(&ce->pin_mutex); + if (err) + goto err_release; + + intel_engine_pm_might_get(ce->engine); + + if (unlikely(intel_context_is_closed(ce))) { + err = -ENOENT; + goto err_unlock; + } + + if (likely(!atomic_add_unless(&ce->pin_count, 1, 0))) { + err = intel_context_active_acquire(ce); + if (unlikely(err)) + goto err_unlock; + + err = ce->ops->pin(ce, vaddr); + if (err) { + intel_context_active_release(ce); + goto err_unlock; + } + + CE_TRACE(ce, "pin ring:{start:%08x, head:%04x, tail:%04x}\n", + i915_ggtt_offset(ce->ring->vma), + ce->ring->head, ce->ring->tail); + + handoff = true; + smp_mb__before_atomic(); /* flush pin before it is visible */ + atomic_inc(&ce->pin_count); + } + + GEM_BUG_ON(!intel_context_is_pinned(ce)); /* no overflow! */ + + trace_intel_context_do_pin(ce); + +err_unlock: + mutex_unlock(&ce->pin_mutex); +err_release: + i915_active_release(&ce->active); +err_post_unpin: + if (!handoff) + ce->ops->post_unpin(ce); +err_ctx_unpin: + intel_context_post_unpin(ce); + + /* + * Unlock the hwsp_ggtt object since it's shared. + * In principle we can unlock all the global state locked above + * since it's pinned and doesn't need fencing, and will + * thus remain resident until it is explicitly unpinned. + */ + i915_gem_ww_unlock_single(ce->timeline->hwsp_ggtt->obj); + + return err; +} + +int __intel_context_do_pin(struct intel_context *ce) +{ + struct i915_gem_ww_ctx ww; + int err; + + i915_gem_ww_ctx_init(&ww, true); +retry: + err = __intel_context_do_pin_ww(ce, &ww); + if (err == -EDEADLK) { + err = i915_gem_ww_ctx_backoff(&ww); + if (!err) + goto retry; + } + i915_gem_ww_ctx_fini(&ww); + return err; +} + +void __intel_context_do_unpin(struct intel_context *ce, int sub) +{ + if (!atomic_sub_and_test(sub, &ce->pin_count)) + return; + + CE_TRACE(ce, "unpin\n"); + ce->ops->unpin(ce); + ce->ops->post_unpin(ce); + + /* + * Once released, we may asynchronously drop the active reference. + * As that may be the only reference keeping the context alive, + * take an extra now so that it is not freed before we finish + * dereferencing it. + */ + intel_context_get(ce); + intel_context_active_release(ce); + trace_intel_context_do_unpin(ce); + intel_context_put(ce); +} + +static void __intel_context_retire(struct i915_active *active) +{ + struct intel_context *ce = container_of(active, typeof(*ce), active); + + CE_TRACE(ce, "retire runtime: { total:%lluns, avg:%lluns }\n", + intel_context_get_total_runtime_ns(ce), + intel_context_get_avg_runtime_ns(ce)); + + set_bit(CONTEXT_VALID_BIT, &ce->flags); + intel_context_post_unpin(ce); + intel_context_put(ce); +} + +static int __intel_context_active(struct i915_active *active) +{ + struct intel_context *ce = container_of(active, typeof(*ce), active); + + intel_context_get(ce); + + /* everything should already be activated by intel_context_pre_pin() */ + GEM_WARN_ON(!i915_active_acquire_if_busy(&ce->ring->vma->active)); + __intel_ring_pin(ce->ring); + + __intel_timeline_pin(ce->timeline); + + if (ce->state) { + GEM_WARN_ON(!i915_active_acquire_if_busy(&ce->state->active)); + __i915_vma_pin(ce->state); + i915_vma_make_unshrinkable(ce->state); + } + + return 0; +} + +static int +sw_fence_dummy_notify(struct i915_sw_fence *sf, + enum i915_sw_fence_notify state) +{ + return NOTIFY_DONE; +} + +void +intel_context_init(struct intel_context *ce, struct intel_engine_cs *engine) +{ + GEM_BUG_ON(!engine->cops); + GEM_BUG_ON(!engine->gt->vm); + + kref_init(&ce->ref); + + ce->engine = engine; + ce->ops = engine->cops; + ce->sseu = engine->sseu; + ce->ring = NULL; + ce->ring_size = SZ_4K; + + ewma_runtime_init(&ce->stats.runtime.avg); + + ce->vm = i915_vm_get(engine->gt->vm); + + /* NB ce->signal_link/lock is used under RCU */ + spin_lock_init(&ce->signal_lock); + INIT_LIST_HEAD(&ce->signals); + + mutex_init(&ce->pin_mutex); + + spin_lock_init(&ce->guc_state.lock); + INIT_LIST_HEAD(&ce->guc_state.fences); + INIT_LIST_HEAD(&ce->guc_state.requests); + + ce->guc_id.id = GUC_INVALID_CONTEXT_ID; + INIT_LIST_HEAD(&ce->guc_id.link); + + INIT_LIST_HEAD(&ce->destroyed_link); + + INIT_LIST_HEAD(&ce->parallel.child_list); + + /* + * Initialize fence to be complete as this is expected to be complete + * unless there is a pending schedule disable outstanding. + */ + i915_sw_fence_init(&ce->guc_state.blocked, + sw_fence_dummy_notify); + i915_sw_fence_commit(&ce->guc_state.blocked); + + i915_active_init(&ce->active, + __intel_context_active, __intel_context_retire, 0); +} + +void intel_context_fini(struct intel_context *ce) +{ + struct intel_context *child, *next; + + if (ce->timeline) + intel_timeline_put(ce->timeline); + i915_vm_put(ce->vm); + + /* Need to put the creation ref for the children */ + if (intel_context_is_parent(ce)) + for_each_child_safe(ce, child, next) + intel_context_put(child); + + mutex_destroy(&ce->pin_mutex); + i915_active_fini(&ce->active); + i915_sw_fence_fini(&ce->guc_state.blocked); +} + +void i915_context_module_exit(void) +{ + kmem_cache_destroy(slab_ce); +} + +int __init i915_context_module_init(void) +{ + slab_ce = KMEM_CACHE(intel_context, SLAB_HWCACHE_ALIGN); + if (!slab_ce) + return -ENOMEM; + + return 0; +} + +void intel_context_enter_engine(struct intel_context *ce) +{ + intel_engine_pm_get(ce->engine); + intel_timeline_enter(ce->timeline); +} + +void intel_context_exit_engine(struct intel_context *ce) +{ + intel_timeline_exit(ce->timeline); + intel_engine_pm_put(ce->engine); +} + +int intel_context_prepare_remote_request(struct intel_context *ce, + struct i915_request *rq) +{ + struct intel_timeline *tl = ce->timeline; + int err; + + /* Only suitable for use in remotely modifying this context */ + GEM_BUG_ON(rq->context == ce); + + if (rcu_access_pointer(rq->timeline) != tl) { /* timeline sharing! */ + /* Queue this switch after current activity by this context. */ + err = i915_active_fence_set(&tl->last_request, rq); + if (err) + return err; + } + + /* + * Guarantee context image and the timeline remains pinned until the + * modifying request is retired by setting the ce activity tracker. + * + * But we only need to take one pin on the account of it. Or in other + * words transfer the pinned ce object to tracked active request. + */ + GEM_BUG_ON(i915_active_is_idle(&ce->active)); + return i915_active_add_request(&ce->active, rq); +} + +struct i915_request *intel_context_create_request(struct intel_context *ce) +{ + struct i915_gem_ww_ctx ww; + struct i915_request *rq; + int err; + + i915_gem_ww_ctx_init(&ww, true); +retry: + err = intel_context_pin_ww(ce, &ww); + if (!err) { + rq = i915_request_create(ce); + intel_context_unpin(ce); + } else if (err == -EDEADLK) { + err = i915_gem_ww_ctx_backoff(&ww); + if (!err) + goto retry; + rq = ERR_PTR(err); + } else { + rq = ERR_PTR(err); + } + + i915_gem_ww_ctx_fini(&ww); + + if (IS_ERR(rq)) + return rq; + + /* + * timeline->mutex should be the inner lock, but is used as outer lock. + * Hack around this to shut up lockdep in selftests.. + */ + lockdep_unpin_lock(&ce->timeline->mutex, rq->cookie); + mutex_release(&ce->timeline->mutex.dep_map, _RET_IP_); + mutex_acquire(&ce->timeline->mutex.dep_map, SINGLE_DEPTH_NESTING, 0, _RET_IP_); + rq->cookie = lockdep_pin_lock(&ce->timeline->mutex); + + return rq; +} + +struct i915_request *intel_context_get_active_request(struct intel_context *ce) +{ + struct intel_context *parent = intel_context_to_parent(ce); + struct i915_request *rq, *active = NULL; + unsigned long flags; + + GEM_BUG_ON(!intel_engine_uses_guc(ce->engine)); + + /* + * We search the parent list to find an active request on the submitted + * context. The parent list contains the requests for all the contexts + * in the relationship so we have to do a compare of each request's + * context. + */ + spin_lock_irqsave(&parent->guc_state.lock, flags); + list_for_each_entry_reverse(rq, &parent->guc_state.requests, + sched.link) { + if (rq->context != ce) + continue; + if (i915_request_completed(rq)) + break; + + active = rq; + } + if (active) + active = i915_request_get_rcu(active); + spin_unlock_irqrestore(&parent->guc_state.lock, flags); + + return active; +} + +void intel_context_bind_parent_child(struct intel_context *parent, + struct intel_context *child) +{ + /* + * Callers responsibility to validate that this function is used + * correctly but we use GEM_BUG_ON here ensure that they do. + */ + GEM_BUG_ON(intel_context_is_pinned(parent)); + GEM_BUG_ON(intel_context_is_child(parent)); + GEM_BUG_ON(intel_context_is_pinned(child)); + GEM_BUG_ON(intel_context_is_child(child)); + GEM_BUG_ON(intel_context_is_parent(child)); + + parent->parallel.child_index = parent->parallel.number_children++; + list_add_tail(&child->parallel.child_link, + &parent->parallel.child_list); + child->parallel.parent = parent; +} + +u64 intel_context_get_total_runtime_ns(const struct intel_context *ce) +{ + u64 total, active; + + total = ce->stats.runtime.total; + if (ce->ops->flags & COPS_RUNTIME_CYCLES) + total *= ce->engine->gt->clock_period_ns; + + active = READ_ONCE(ce->stats.active); + if (active) + active = intel_context_clock() - active; + + return total + active; +} + +u64 intel_context_get_avg_runtime_ns(struct intel_context *ce) +{ + u64 avg = ewma_runtime_read(&ce->stats.runtime.avg); + + if (ce->ops->flags & COPS_RUNTIME_CYCLES) + avg *= ce->engine->gt->clock_period_ns; + + return avg; +} + +bool intel_context_ban(struct intel_context *ce, struct i915_request *rq) +{ + bool ret = intel_context_set_banned(ce); + + trace_intel_context_ban(ce); + + if (ce->ops->revoke) + ce->ops->revoke(ce, rq, + INTEL_CONTEXT_BANNED_PREEMPT_TIMEOUT_MS); + + return ret; +} + +bool intel_context_revoke(struct intel_context *ce) +{ + bool ret = intel_context_set_exiting(ce); + + if (ce->ops->revoke) + ce->ops->revoke(ce, NULL, ce->engine->props.preempt_timeout_ms); + + return ret; +} + +#if IS_ENABLED(CONFIG_DRM_I915_SELFTEST) +#include "selftest_context.c" +#endif |