diff options
Diffstat (limited to 'drivers/gpu/drm/i915/gt/mock_engine.c')
-rw-r--r-- | drivers/gpu/drm/i915/gt/mock_engine.c | 445 |
1 files changed, 445 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/gt/mock_engine.c b/drivers/gpu/drm/i915/gt/mock_engine.c new file mode 100644 index 0000000000..c0637bf799 --- /dev/null +++ b/drivers/gpu/drm/i915/gt/mock_engine.c @@ -0,0 +1,445 @@ +// SPDX-License-Identifier: MIT +/* + * Copyright © 2016 Intel Corporation + */ + +#include "gem/i915_gem_context.h" +#include "gt/intel_ring.h" + +#include "i915_drv.h" +#include "intel_context.h" +#include "intel_engine_pm.h" + +#include "mock_engine.h" +#include "selftests/mock_request.h" + +static int mock_timeline_pin(struct intel_timeline *tl) +{ + int err; + + if (WARN_ON(!i915_gem_object_trylock(tl->hwsp_ggtt->obj, NULL))) + return -EBUSY; + + err = intel_timeline_pin_map(tl); + i915_gem_object_unlock(tl->hwsp_ggtt->obj); + if (err) + return err; + + atomic_inc(&tl->pin_count); + return 0; +} + +static void mock_timeline_unpin(struct intel_timeline *tl) +{ + GEM_BUG_ON(!atomic_read(&tl->pin_count)); + atomic_dec(&tl->pin_count); +} + +static struct i915_vma *create_ring_vma(struct i915_ggtt *ggtt, int size) +{ + struct i915_address_space *vm = &ggtt->vm; + struct drm_i915_private *i915 = vm->i915; + struct drm_i915_gem_object *obj; + struct i915_vma *vma; + + obj = i915_gem_object_create_internal(i915, size); + if (IS_ERR(obj)) + return ERR_CAST(obj); + + vma = i915_vma_instance(obj, vm, NULL); + if (IS_ERR(vma)) + goto err; + + return vma; + +err: + i915_gem_object_put(obj); + return vma; +} + +static struct intel_ring *mock_ring(struct intel_engine_cs *engine) +{ + const unsigned long sz = PAGE_SIZE; + struct intel_ring *ring; + + ring = kzalloc(sizeof(*ring) + sz, GFP_KERNEL); + if (!ring) + return NULL; + + kref_init(&ring->ref); + ring->size = sz; + ring->effective_size = sz; + ring->vaddr = (void *)(ring + 1); + atomic_set(&ring->pin_count, 1); + + ring->vma = create_ring_vma(engine->gt->ggtt, PAGE_SIZE); + if (IS_ERR(ring->vma)) { + kfree(ring); + return NULL; + } + + intel_ring_update_space(ring); + + return ring; +} + +static void mock_ring_free(struct intel_ring *ring) +{ + i915_vma_put(ring->vma); + + kfree(ring); +} + +static struct i915_request *first_request(struct mock_engine *engine) +{ + return list_first_entry_or_null(&engine->hw_queue, + struct i915_request, + mock.link); +} + +static void advance(struct i915_request *request) +{ + list_del_init(&request->mock.link); + i915_request_mark_complete(request); + GEM_BUG_ON(!i915_request_completed(request)); + + intel_engine_signal_breadcrumbs(request->engine); +} + +static void hw_delay_complete(struct timer_list *t) +{ + struct mock_engine *engine = from_timer(engine, t, hw_delay); + struct i915_request *request; + unsigned long flags; + + spin_lock_irqsave(&engine->hw_lock, flags); + + /* Timer fired, first request is complete */ + request = first_request(engine); + if (request) + advance(request); + + /* + * Also immediately signal any subsequent 0-delay requests, but + * requeue the timer for the next delayed request. + */ + while ((request = first_request(engine))) { + if (request->mock.delay) { + mod_timer(&engine->hw_delay, + jiffies + request->mock.delay); + break; + } + + advance(request); + } + + spin_unlock_irqrestore(&engine->hw_lock, flags); +} + +static void mock_context_unpin(struct intel_context *ce) +{ +} + +static void mock_context_post_unpin(struct intel_context *ce) +{ + i915_vma_unpin(ce->ring->vma); +} + +static void mock_context_destroy(struct kref *ref) +{ + struct intel_context *ce = container_of(ref, typeof(*ce), ref); + + GEM_BUG_ON(intel_context_is_pinned(ce)); + + if (test_bit(CONTEXT_ALLOC_BIT, &ce->flags)) { + mock_ring_free(ce->ring); + mock_timeline_unpin(ce->timeline); + } + + intel_context_fini(ce); + intel_context_free(ce); +} + +static int mock_context_alloc(struct intel_context *ce) +{ + int err; + + ce->ring = mock_ring(ce->engine); + if (!ce->ring) + return -ENOMEM; + + ce->timeline = intel_timeline_create(ce->engine->gt); + if (IS_ERR(ce->timeline)) { + kfree(ce->engine); + return PTR_ERR(ce->timeline); + } + + err = mock_timeline_pin(ce->timeline); + if (err) { + intel_timeline_put(ce->timeline); + ce->timeline = NULL; + return err; + } + + return 0; +} + +static int mock_context_pre_pin(struct intel_context *ce, + struct i915_gem_ww_ctx *ww, void **unused) +{ + return i915_vma_pin_ww(ce->ring->vma, ww, 0, 0, PIN_GLOBAL | PIN_HIGH); +} + +static int mock_context_pin(struct intel_context *ce, void *unused) +{ + return 0; +} + +static void mock_context_reset(struct intel_context *ce) +{ +} + +static const struct intel_context_ops mock_context_ops = { + .alloc = mock_context_alloc, + + .pre_pin = mock_context_pre_pin, + .pin = mock_context_pin, + .unpin = mock_context_unpin, + .post_unpin = mock_context_post_unpin, + + .enter = intel_context_enter_engine, + .exit = intel_context_exit_engine, + + .reset = mock_context_reset, + .destroy = mock_context_destroy, +}; + +static int mock_request_alloc(struct i915_request *request) +{ + INIT_LIST_HEAD(&request->mock.link); + request->mock.delay = 0; + + return 0; +} + +static int mock_emit_flush(struct i915_request *request, + unsigned int flags) +{ + return 0; +} + +static u32 *mock_emit_breadcrumb(struct i915_request *request, u32 *cs) +{ + return cs; +} + +static void mock_submit_request(struct i915_request *request) +{ + struct mock_engine *engine = + container_of(request->engine, typeof(*engine), base); + unsigned long flags; + + i915_request_submit(request); + + spin_lock_irqsave(&engine->hw_lock, flags); + list_add_tail(&request->mock.link, &engine->hw_queue); + if (list_is_first(&request->mock.link, &engine->hw_queue)) { + if (request->mock.delay) + mod_timer(&engine->hw_delay, + jiffies + request->mock.delay); + else + advance(request); + } + spin_unlock_irqrestore(&engine->hw_lock, flags); +} + +static void mock_add_to_engine(struct i915_request *rq) +{ + lockdep_assert_held(&rq->engine->sched_engine->lock); + list_move_tail(&rq->sched.link, &rq->engine->sched_engine->requests); +} + +static void mock_remove_from_engine(struct i915_request *rq) +{ + struct intel_engine_cs *engine, *locked; + + /* + * Virtual engines complicate acquiring the engine timeline lock, + * as their rq->engine pointer is not stable until under that + * engine lock. The simple ploy we use is to take the lock then + * check that the rq still belongs to the newly locked engine. + */ + + locked = READ_ONCE(rq->engine); + spin_lock_irq(&locked->sched_engine->lock); + while (unlikely(locked != (engine = READ_ONCE(rq->engine)))) { + spin_unlock(&locked->sched_engine->lock); + spin_lock(&engine->sched_engine->lock); + locked = engine; + } + list_del_init(&rq->sched.link); + spin_unlock_irq(&locked->sched_engine->lock); +} + +static void mock_reset_prepare(struct intel_engine_cs *engine) +{ +} + +static void mock_reset_rewind(struct intel_engine_cs *engine, bool stalled) +{ + GEM_BUG_ON(stalled); +} + +static void mock_reset_cancel(struct intel_engine_cs *engine) +{ + struct mock_engine *mock = + container_of(engine, typeof(*mock), base); + struct i915_request *rq; + unsigned long flags; + + del_timer_sync(&mock->hw_delay); + + spin_lock_irqsave(&engine->sched_engine->lock, flags); + + /* Mark all submitted requests as skipped. */ + list_for_each_entry(rq, &engine->sched_engine->requests, sched.link) + i915_request_put(i915_request_mark_eio(rq)); + intel_engine_signal_breadcrumbs(engine); + + /* Cancel and submit all pending requests. */ + list_for_each_entry(rq, &mock->hw_queue, mock.link) { + if (i915_request_mark_eio(rq)) { + __i915_request_submit(rq); + i915_request_put(rq); + } + } + INIT_LIST_HEAD(&mock->hw_queue); + + spin_unlock_irqrestore(&engine->sched_engine->lock, flags); +} + +static void mock_reset_finish(struct intel_engine_cs *engine) +{ +} + +static void mock_engine_release(struct intel_engine_cs *engine) +{ + struct mock_engine *mock = + container_of(engine, typeof(*mock), base); + + GEM_BUG_ON(timer_pending(&mock->hw_delay)); + + i915_sched_engine_put(engine->sched_engine); + intel_breadcrumbs_put(engine->breadcrumbs); + + intel_context_unpin(engine->kernel_context); + intel_context_put(engine->kernel_context); + + intel_engine_fini_retire(engine); +} + +struct intel_engine_cs *mock_engine(struct drm_i915_private *i915, + const char *name, + int id) +{ + struct mock_engine *engine; + + GEM_BUG_ON(id >= I915_NUM_ENGINES); + GEM_BUG_ON(!to_gt(i915)->uncore); + + engine = kzalloc(sizeof(*engine) + PAGE_SIZE, GFP_KERNEL); + if (!engine) + return NULL; + + /* minimal engine setup for requests */ + engine->base.i915 = i915; + engine->base.gt = to_gt(i915); + engine->base.uncore = to_gt(i915)->uncore; + snprintf(engine->base.name, sizeof(engine->base.name), "%s", name); + engine->base.id = id; + engine->base.mask = BIT(id); + engine->base.legacy_idx = INVALID_ENGINE; + engine->base.instance = id; + engine->base.status_page.addr = (void *)(engine + 1); + + engine->base.cops = &mock_context_ops; + engine->base.request_alloc = mock_request_alloc; + engine->base.emit_flush = mock_emit_flush; + engine->base.emit_fini_breadcrumb = mock_emit_breadcrumb; + engine->base.submit_request = mock_submit_request; + engine->base.add_active_request = mock_add_to_engine; + engine->base.remove_active_request = mock_remove_from_engine; + + engine->base.reset.prepare = mock_reset_prepare; + engine->base.reset.rewind = mock_reset_rewind; + engine->base.reset.cancel = mock_reset_cancel; + engine->base.reset.finish = mock_reset_finish; + + engine->base.release = mock_engine_release; + + to_gt(i915)->engine[id] = &engine->base; + to_gt(i915)->engine_class[0][id] = &engine->base; + + /* fake hw queue */ + spin_lock_init(&engine->hw_lock); + timer_setup(&engine->hw_delay, hw_delay_complete, 0); + INIT_LIST_HEAD(&engine->hw_queue); + + intel_engine_add_user(&engine->base); + + return &engine->base; +} + +int mock_engine_init(struct intel_engine_cs *engine) +{ + struct intel_context *ce; + + INIT_LIST_HEAD(&engine->pinned_contexts_list); + + engine->sched_engine = i915_sched_engine_create(ENGINE_MOCK); + if (!engine->sched_engine) + return -ENOMEM; + engine->sched_engine->private_data = engine; + + intel_engine_init_execlists(engine); + intel_engine_init__pm(engine); + intel_engine_init_retire(engine); + + engine->breadcrumbs = intel_breadcrumbs_create(NULL); + if (!engine->breadcrumbs) + goto err_schedule; + + ce = create_kernel_context(engine); + if (IS_ERR(ce)) + goto err_breadcrumbs; + + /* We insist the kernel context is using the status_page */ + engine->status_page.vma = ce->timeline->hwsp_ggtt; + + engine->kernel_context = ce; + return 0; + +err_breadcrumbs: + intel_breadcrumbs_put(engine->breadcrumbs); +err_schedule: + i915_sched_engine_put(engine->sched_engine); + return -ENOMEM; +} + +void mock_engine_flush(struct intel_engine_cs *engine) +{ + struct mock_engine *mock = + container_of(engine, typeof(*mock), base); + struct i915_request *request, *rn; + + del_timer_sync(&mock->hw_delay); + + spin_lock_irq(&mock->hw_lock); + list_for_each_entry_safe(request, rn, &mock->hw_queue, mock.link) + advance(request); + spin_unlock_irq(&mock->hw_lock); +} + +void mock_engine_reset(struct intel_engine_cs *engine) +{ +} |