/*
 * Copyright © 2012 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.
 *
 * Authors:
 *    Ben Widawsky <ben@bwidawsk.net>
 *
 */

#include "igt.h"
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <time.h>

#define LOCAL_I915_EXEC_BSD_SHIFT      (13)
#define LOCAL_I915_EXEC_BSD_MASK       (3 << LOCAL_I915_EXEC_BSD_SHIFT)

#define ENGINE_FLAGS  (I915_EXEC_RING_MASK | LOCAL_I915_EXEC_BSD_MASK)

static unsigned ppgtt_engines[16];
static unsigned ppgtt_nengine;

static int __gem_context_create(int fd, struct drm_i915_gem_context_create *arg)
{
	int ret = 0;
	if (drmIoctl(fd, DRM_IOCTL_I915_GEM_CONTEXT_CREATE, arg))
		ret = -errno;
	return ret;
}

static double elapsed(const struct timespec *start,
		      const struct timespec *end)
{
	return (end->tv_sec - start->tv_sec) + 1e-9*(end->tv_nsec - start->tv_nsec);
}

static void files(int core, int timeout, const int ncpus)
{
	const uint32_t bbe = MI_BATCH_BUFFER_END;
	struct drm_i915_gem_execbuffer2 execbuf;
	struct drm_i915_gem_exec_object2 obj;
	uint32_t batch, name;

	batch = gem_create(core, 4096);
	gem_write(core, batch, 0, &bbe, sizeof(bbe));
	name = gem_flink(core, batch);

	memset(&obj, 0, sizeof(obj));
	memset(&execbuf, 0, sizeof(execbuf));
	execbuf.buffers_ptr = (uintptr_t)&obj;
	execbuf.buffer_count = 1;

	igt_fork(child, ncpus) {
		struct timespec start, end;
		unsigned count = 0;

		clock_gettime(CLOCK_MONOTONIC, &start);
		do {
			do {
				int fd = drm_open_driver(DRIVER_INTEL);
				obj.handle = gem_open(fd, name);
				execbuf.flags &= ~ENGINE_FLAGS;
				execbuf.flags |= ppgtt_engines[count % ppgtt_nengine];
				gem_execbuf(fd, &execbuf);
				close(fd);
			} while (++count & 1023);
			clock_gettime(CLOCK_MONOTONIC, &end);
		} while (elapsed(&start, &end) < timeout);

		gem_sync(core, batch);
		clock_gettime(CLOCK_MONOTONIC, &end);
		igt_info("[%d] File creation + execution: %.3f us\n",
			 child, elapsed(&start, &end) / count *1e6);
	}
	igt_waitchildren();

	gem_close(core, batch);
}

static void active(int fd, unsigned engine, int timeout, const int ncpus)
{
	const uint32_t bbe = MI_BATCH_BUFFER_END;
	struct drm_i915_gem_execbuffer2 execbuf;
	struct drm_i915_gem_exec_object2 obj;

	gem_require_ring(fd, engine);

	memset(&obj, 0, sizeof(obj));
	obj.handle = gem_create(fd, 4096);
	gem_write(fd, obj.handle, 0, &bbe, sizeof(bbe));

	memset(&execbuf, 0, sizeof(execbuf));
	execbuf.buffers_ptr = (uintptr_t)&obj;
	execbuf.buffer_count = 1;
	execbuf.flags = engine;

	igt_fork(child, ncpus) {
		struct timespec start, end;
		unsigned count = 0;

		clock_gettime(CLOCK_MONOTONIC, &start);
		do {
			do {
				execbuf.rsvd1 = gem_context_create(fd);
				gem_execbuf(fd, &execbuf);
				gem_context_destroy(fd, execbuf.rsvd1);
			} while (++count & 1023);
			clock_gettime(CLOCK_MONOTONIC, &end);
		} while (elapsed(&start, &end) < timeout);

		gem_sync(fd, obj.handle);
		clock_gettime(CLOCK_MONOTONIC, &end);
		igt_info("[%d] Context creation + execution: %.3f us\n",
			 child, elapsed(&start, &end) / count *1e6);
	}
	igt_waitchildren();

	gem_close(fd, obj.handle);
}

igt_main
{
	const int ncpus = sysconf(_SC_NPROCESSORS_ONLN);
	struct drm_i915_gem_context_create create;
	int fd = -1;

	igt_fixture {
		fd = drm_open_driver(DRIVER_INTEL);

		memset(&create, 0, sizeof(create));
		igt_require(__gem_context_create(fd, &create) == 0);
		gem_context_destroy(fd, create.ctx_id);

		if (gem_uses_full_ppgtt(fd)) {
			unsigned engine;

			for_each_engine(fd, engine) {
				if (engine == 0)
					continue;
				ppgtt_engines[ppgtt_nengine++] = engine;
			}
		} else
			ppgtt_engines[ppgtt_nengine++] = 0;

		igt_fork_hang_detector(fd);
	}

	igt_subtest("basic") {
		memset(&create, 0, sizeof(create));
		create.ctx_id = rand();
		create.pad = 0;
		igt_assert_eq(__gem_context_create(fd, &create), 0);
		igt_assert(create.ctx_id != 0);
		gem_context_destroy(fd, create.ctx_id);
	}

	igt_subtest("invalid-pad") {
		memset(&create, 0, sizeof(create));
		create.ctx_id = rand();
		create.pad = 1;
		igt_assert_eq(__gem_context_create(fd, &create), -EINVAL);
	}

	igt_subtest("basic-files")
		files(fd, 20, 1);
	igt_subtest("forked-files")
		files(fd, 20, ncpus);

	for (const struct intel_execution_engine *e = intel_execution_engines;
	     e->name; e++) {
		igt_subtest_f("active-%s", e->name)
			active(fd, e->exec_id | e->flags, 20, 1);
		igt_subtest_f("forked-active-%s", e->name)
			active(fd, e->exec_id | e->flags, 20, ncpus);
	}

	igt_fixture {
		igt_stop_hang_detector();
		close(fd);
	}
}