/*
 * Copyright 2009 Jerome Glisse.
 *
 * 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 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 COPYRIGHT HOLDER(S) OR AUTHOR(S) 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: Jerome Glisse
 */

#include <drm/amdgpu_drm.h>
#include "amdgpu.h"

#define AMDGPU_BENCHMARK_ITERATIONS 1024
#define AMDGPU_BENCHMARK_COMMON_MODES_N 17

static int amdgpu_benchmark_do_move(struct amdgpu_device *adev, unsigned size,
				    uint64_t saddr, uint64_t daddr, int n, s64 *time_ms)
{
	ktime_t stime, etime;
	struct dma_fence *fence;
	int i, r;

	stime = ktime_get();
	for (i = 0; i < n; i++) {
		struct amdgpu_ring *ring = adev->mman.buffer_funcs_ring;
		r = amdgpu_copy_buffer(ring, saddr, daddr, size, NULL, &fence,
				       false, false, 0);
		if (r)
			goto exit_do_move;
		r = dma_fence_wait(fence, false);
		dma_fence_put(fence);
		if (r)
			goto exit_do_move;
	}

exit_do_move:
	etime = ktime_get();
	*time_ms = ktime_ms_delta(etime, stime);

	return r;
}


static void amdgpu_benchmark_log_results(struct amdgpu_device *adev,
					 int n, unsigned size,
					 s64 time_ms,
					 unsigned sdomain, unsigned ddomain,
					 char *kind)
{
	s64 throughput = (n * (size >> 10));

	throughput = div64_s64(throughput, time_ms);

	dev_info(adev->dev, "amdgpu: %s %u bo moves of %u kB from"
		 " %d to %d in %lld ms, throughput: %lld Mb/s or %lld MB/s\n",
		 kind, n, size >> 10, sdomain, ddomain, time_ms,
		 throughput * 8, throughput);
}

static int amdgpu_benchmark_move(struct amdgpu_device *adev, unsigned size,
				 unsigned sdomain, unsigned ddomain)
{
	struct amdgpu_bo *dobj = NULL;
	struct amdgpu_bo *sobj = NULL;
	uint64_t saddr, daddr;
	s64 time_ms;
	int r, n;

	n = AMDGPU_BENCHMARK_ITERATIONS;

	r = amdgpu_bo_create_kernel(adev, size,
				    PAGE_SIZE, sdomain,
				    &sobj,
				    &saddr,
				    NULL);
	if (r)
		goto out_cleanup;
	r = amdgpu_bo_create_kernel(adev, size,
				    PAGE_SIZE, ddomain,
				    &dobj,
				    &daddr,
				    NULL);
	if (r)
		goto out_cleanup;

	if (adev->mman.buffer_funcs) {
		r = amdgpu_benchmark_do_move(adev, size, saddr, daddr, n, &time_ms);
		if (r)
			goto out_cleanup;
		else
			amdgpu_benchmark_log_results(adev, n, size, time_ms,
						     sdomain, ddomain, "dma");
	}

out_cleanup:
	/* Check error value now. The value can be overwritten when clean up.*/
	if (r < 0)
		dev_info(adev->dev, "Error while benchmarking BO move.\n");

	if (sobj)
		amdgpu_bo_free_kernel(&sobj, &saddr, NULL);
	if (dobj)
		amdgpu_bo_free_kernel(&dobj, &daddr, NULL);
	return r;
}

int amdgpu_benchmark(struct amdgpu_device *adev, int test_number)
{
	int i, r;
	static const int common_modes[AMDGPU_BENCHMARK_COMMON_MODES_N] = {
		640 * 480 * 4,
		720 * 480 * 4,
		800 * 600 * 4,
		848 * 480 * 4,
		1024 * 768 * 4,
		1152 * 768 * 4,
		1280 * 720 * 4,
		1280 * 800 * 4,
		1280 * 854 * 4,
		1280 * 960 * 4,
		1280 * 1024 * 4,
		1440 * 900 * 4,
		1400 * 1050 * 4,
		1680 * 1050 * 4,
		1600 * 1200 * 4,
		1920 * 1080 * 4,
		1920 * 1200 * 4
	};

	mutex_lock(&adev->benchmark_mutex);
	switch (test_number) {
	case 1:
		dev_info(adev->dev,
			 "benchmark test: %d (simple test, VRAM to GTT and GTT to VRAM)\n",
			 test_number);
		/* simple test, VRAM to GTT and GTT to VRAM */
		r = amdgpu_benchmark_move(adev, 1024*1024, AMDGPU_GEM_DOMAIN_GTT,
					  AMDGPU_GEM_DOMAIN_VRAM);
		if (r)
			goto done;
		r = amdgpu_benchmark_move(adev, 1024*1024, AMDGPU_GEM_DOMAIN_VRAM,
					  AMDGPU_GEM_DOMAIN_GTT);
		if (r)
			goto done;
		break;
	case 2:
		dev_info(adev->dev,
			 "benchmark test: %d (simple test, VRAM to VRAM)\n",
			 test_number);
		/* simple test, VRAM to VRAM */
		r = amdgpu_benchmark_move(adev, 1024*1024, AMDGPU_GEM_DOMAIN_VRAM,
					  AMDGPU_GEM_DOMAIN_VRAM);
		if (r)
			goto done;
		break;
	case 3:
		dev_info(adev->dev,
			 "benchmark test: %d (GTT to VRAM, buffer size sweep, powers of 2)\n",
			 test_number);
		/* GTT to VRAM, buffer size sweep, powers of 2 */
		for (i = 1; i <= 16384; i <<= 1) {
			r = amdgpu_benchmark_move(adev, i * AMDGPU_GPU_PAGE_SIZE,
						  AMDGPU_GEM_DOMAIN_GTT,
						  AMDGPU_GEM_DOMAIN_VRAM);
			if (r)
				goto done;
		}
		break;
	case 4:
		dev_info(adev->dev,
			 "benchmark test: %d (VRAM to GTT, buffer size sweep, powers of 2)\n",
			 test_number);
		/* VRAM to GTT, buffer size sweep, powers of 2 */
		for (i = 1; i <= 16384; i <<= 1) {
			r = amdgpu_benchmark_move(adev, i * AMDGPU_GPU_PAGE_SIZE,
						  AMDGPU_GEM_DOMAIN_VRAM,
						  AMDGPU_GEM_DOMAIN_GTT);
			if (r)
				goto done;
		}
		break;
	case 5:
		dev_info(adev->dev,
			 "benchmark test: %d (VRAM to VRAM, buffer size sweep, powers of 2)\n",
			 test_number);
		/* VRAM to VRAM, buffer size sweep, powers of 2 */
		for (i = 1; i <= 16384; i <<= 1) {
			r = amdgpu_benchmark_move(adev, i * AMDGPU_GPU_PAGE_SIZE,
						  AMDGPU_GEM_DOMAIN_VRAM,
						  AMDGPU_GEM_DOMAIN_VRAM);
			if (r)
				goto done;
		}
		break;
	case 6:
		dev_info(adev->dev,
			 "benchmark test: %d (GTT to VRAM, buffer size sweep, common modes)\n",
			 test_number);
		/* GTT to VRAM, buffer size sweep, common modes */
		for (i = 0; i < AMDGPU_BENCHMARK_COMMON_MODES_N; i++) {
			r = amdgpu_benchmark_move(adev, common_modes[i],
						  AMDGPU_GEM_DOMAIN_GTT,
						  AMDGPU_GEM_DOMAIN_VRAM);
			if (r)
				goto done;
		}
		break;
	case 7:
		dev_info(adev->dev,
			 "benchmark test: %d (VRAM to GTT, buffer size sweep, common modes)\n",
			 test_number);
		/* VRAM to GTT, buffer size sweep, common modes */
		for (i = 0; i < AMDGPU_BENCHMARK_COMMON_MODES_N; i++) {
			r = amdgpu_benchmark_move(adev, common_modes[i],
						  AMDGPU_GEM_DOMAIN_VRAM,
						  AMDGPU_GEM_DOMAIN_GTT);
			if (r)
				goto done;
		}
		break;
	case 8:
		dev_info(adev->dev,
			 "benchmark test: %d (VRAM to VRAM, buffer size sweep, common modes)\n",
			 test_number);
		/* VRAM to VRAM, buffer size sweep, common modes */
		for (i = 0; i < AMDGPU_BENCHMARK_COMMON_MODES_N; i++) {
			r = amdgpu_benchmark_move(adev, common_modes[i],
					      AMDGPU_GEM_DOMAIN_VRAM,
					      AMDGPU_GEM_DOMAIN_VRAM);
			if (r)
				goto done;
		}
		break;

	default:
		dev_info(adev->dev, "Unknown benchmark %d\n", test_number);
		r = -EINVAL;
		break;
	}

done:
	mutex_unlock(&adev->benchmark_mutex);

	return r;
}