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)
+{
+}