linux_dsm_epyc7002/drivers/gpu/drm/i915/selftests/mock_engine.c

/*
 * 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 "mock_engine.h"

struct intel_engine_cs *mock_engine(const char *name)
{
	struct intel_engine_cs *engine;
	static int id;

	engine = kzalloc(sizeof(*engine) + PAGE_SIZE, GFP_KERNEL);
	if (!engine)
		return NULL;

	/* minimal engine setup for seqno */
	engine->name = name;
	engine->id = id++;
	engine->status_page.page_addr = (void *)(engine + 1);

	/* minimal breadcrumbs init */
	spin_lock_init(&engine->breadcrumbs.lock);
	engine->breadcrumbs.mock = true;

	return engine;
}

void mock_engine_flush(struct intel_engine_cs *engine)
{
}

void mock_engine_reset(struct intel_engine_cs *engine)
{
	intel_write_status_page(engine, I915_GEM_HWS_INDEX, 0);
}