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32 results

mock_engine.c

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  • mock_engine.c 8.24 KiB
    /*
     * 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 "gem/i915_gem_context.h"
    
    #include "i915_drv.h"
    #include "intel_context.h"
    #include "intel_engine_pm.h"
    #include "intel_engine_pool.h"
    
    #include "mock_engine.h"
    #include "selftests/mock_request.h"
    
    struct mock_ring {
    	struct intel_ring base;
    	struct intel_timeline timeline;
    };
    
    static void mock_timeline_pin(struct intel_timeline *tl)
    {
    	tl->pin_count++;
    }
    
    static void mock_timeline_unpin(struct intel_timeline *tl)
    {
    	GEM_BUG_ON(!tl->pin_count);
    	tl->pin_count--;
    }
    
    static struct intel_ring *mock_ring(struct intel_engine_cs *engine)
    {
    	const unsigned long sz = PAGE_SIZE / 2;
    	struct mock_ring *ring;
    
    	ring = kzalloc(sizeof(*ring) + sz, GFP_KERNEL);
    	if (!ring)
    		return NULL;
    
    	if (intel_timeline_init(&ring->timeline, engine->gt, NULL)) {
    		kfree(ring);
    		return NULL;
    	}
    
    	kref_init(&ring->base.ref);
    	ring->base.size = sz;
    	ring->base.effective_size = sz;
    	ring->base.vaddr = (void *)(ring + 1);
    	ring->base.timeline = &ring->timeline;
    	atomic_set(&ring->base.pin_count, 1);
    
    	INIT_LIST_HEAD(&ring->base.request_list);
    	intel_ring_update_space(&ring->base);
    
    	return &ring->base;
    }
    
    static void mock_ring_free(struct intel_ring *base)
    {
    	struct mock_ring *ring = container_of(base, typeof(*ring), base);
    
    	intel_timeline_fini(&ring->timeline);
    	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_queue_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)
    {
    	mock_timeline_unpin(ce->ring->timeline);
    }
    
    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 (ce->ring)
    		mock_ring_free(ce->ring);
    
    	intel_context_fini(ce);
    	intel_context_free(ce);
    }
    
    static int mock_context_pin(struct intel_context *ce)
    {
    	int ret;
    
    	if (!ce->ring) {
    		ce->ring = mock_ring(ce->engine);
    		if (!ce->ring)
    			return -ENOMEM;
    	}
    
    	ret = intel_context_active_acquire(ce);
    	if (ret)
    		return ret;
    
    	mock_timeline_pin(ce->ring->timeline);
    	return 0;
    }
    
    static const struct intel_context_ops mock_context_ops = {
    	.pin = mock_context_pin,
    	.unpin = mock_context_unpin,
    
    	.enter = intel_context_enter_engine,
    	.exit = intel_context_exit_engine,
    
    	.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_reset_prepare(struct intel_engine_cs *engine)
    {
    }
    
    static void mock_reset(struct intel_engine_cs *engine, bool stalled)
    {
    	GEM_BUG_ON(stalled);
    }
    
    static void mock_reset_finish(struct intel_engine_cs *engine)
    {
    }
    
    static void mock_cancel_requests(struct intel_engine_cs *engine)
    {
    	struct i915_request *request;
    	unsigned long flags;
    
    	spin_lock_irqsave(&engine->active.lock, flags);
    
    	/* Mark all submitted requests as skipped. */
    	list_for_each_entry(request, &engine->active.requests, sched.link) {
    		if (!i915_request_signaled(request))
    			dma_fence_set_error(&request->fence, -EIO);
    
    		i915_request_mark_complete(request);
    	}
    
    	spin_unlock_irqrestore(&engine->active.lock, flags);
    }
    
    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);
    
    	engine = kzalloc(sizeof(*engine) + PAGE_SIZE, GFP_KERNEL);
    	if (!engine)
    		return NULL;
    
    	/* minimal engine setup for requests */
    	engine->base.i915 = i915;
    	engine->base.gt = &i915->gt;
    	snprintf(engine->base.name, sizeof(engine->base.name), "%s", name);
    	engine->base.id = id;
    	engine->base.mask = BIT(id);
    	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.reset.prepare = mock_reset_prepare;
    	engine->base.reset.reset = mock_reset;
    	engine->base.reset.finish = mock_reset_finish;
    	engine->base.cancel_requests = mock_cancel_requests;
    
    	/* 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;
    
    	intel_engine_init_active(engine, ENGINE_MOCK);
    	intel_engine_init_breadcrumbs(engine);
    	intel_engine_init_execlists(engine);
    	intel_engine_init__pm(engine);
    	intel_engine_pool_init(&engine->pool);
    
    	ce = create_kernel_context(engine);
    	if (IS_ERR(ce))
    		goto err_breadcrumbs;
    
    	engine->kernel_context = ce;
    	return 0;
    
    err_breadcrumbs:
    	intel_engine_fini_breadcrumbs(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)
    {
    }
    
    void mock_engine_free(struct intel_engine_cs *engine)
    {
    	struct mock_engine *mock =
    		container_of(engine, typeof(*mock), base);
    
    	GEM_BUG_ON(timer_pending(&mock->hw_delay));
    
    	intel_context_unpin(engine->kernel_context);
    	intel_context_put(engine->kernel_context);
    
    	intel_engine_fini_breadcrumbs(engine);
    
    	kfree(engine);
    }