/*
 * 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/drmP.h>
#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)
{
        unsigned long start_jiffies;
        unsigned long end_jiffies;
        struct dma_fence *fence = NULL;
        int i, r;

        start_jiffies = jiffies;
        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);
                if (r)
                        goto exit_do_move;
                r = dma_fence_wait(fence, false);
                if (r)
                        goto exit_do_move;
                dma_fence_put(fence);
        }
        end_jiffies = jiffies;
        r = jiffies_to_msecs(end_jiffies - start_jiffies);

exit_do_move:
        if (fence)
                dma_fence_put(fence);
        return r;
}


static void amdgpu_benchmark_log_results(int n, unsigned size,
                                         unsigned int time,
                                         unsigned sdomain, unsigned ddomain,
                                         char *kind)
{
        unsigned int throughput = (n * (size >> 10)) / time;
        DRM_INFO("amdgpu: %s %u bo moves of %u kB from"
                 " %d to %d in %u ms, throughput: %u Mb/s or %u MB/s\n",
                 kind, n, size >> 10, sdomain, ddomain, time,
                 throughput * 8, throughput);
}

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

        memset(&bp, 0, sizeof(bp));
        bp.size = size;
        bp.byte_align = PAGE_SIZE;
        bp.domain = sdomain;
        bp.flags = 0;
        bp.type = ttm_bo_type_kernel;
        bp.resv = NULL;
        n = AMDGPU_BENCHMARK_ITERATIONS;
        r = amdgpu_bo_create(adev, &bp, &sobj);
        if (r) {
                goto out_cleanup;
        }
        r = amdgpu_bo_reserve(sobj, false);
        if (unlikely(r != 0))
                goto out_cleanup;
        r = amdgpu_bo_pin(sobj, sdomain);
        if (r) {
                amdgpu_bo_unreserve(sobj);
                goto out_cleanup;
        }
        r = amdgpu_ttm_alloc_gart(&sobj->tbo);
        amdgpu_bo_unreserve(sobj);
        if (r) {
                goto out_cleanup;
        }
        saddr = amdgpu_bo_gpu_offset(sobj);
        bp.domain = ddomain;
        r = amdgpu_bo_create(adev, &bp, &dobj);
        if (r) {
                goto out_cleanup;
        }
        r = amdgpu_bo_reserve(dobj, false);
        if (unlikely(r != 0))
                goto out_cleanup;
        r = amdgpu_bo_pin(dobj, ddomain);
        if (r) {
                amdgpu_bo_unreserve(sobj);
                goto out_cleanup;
        }
        r = amdgpu_ttm_alloc_gart(&dobj->tbo);
        amdgpu_bo_unreserve(dobj);
        if (r) {
                goto out_cleanup;
        }
        daddr = amdgpu_bo_gpu_offset(dobj);

        if (adev->mman.buffer_funcs) {
                time = amdgpu_benchmark_do_move(adev, size, saddr, daddr, n);
                if (time < 0)
                        goto out_cleanup;
                if (time > 0)
                        amdgpu_benchmark_log_results(n, size, time,
                                                     sdomain, ddomain, "dma");
        }

out_cleanup:
        /* Check error value now. The value can be overwritten when clean up.*/
        if (r) {
                DRM_ERROR("Error while benchmarking BO move.\n");
        }

        if (sobj) {
                r = amdgpu_bo_reserve(sobj, true);
                if (likely(r == 0)) {
                        amdgpu_bo_unpin(sobj);
                        amdgpu_bo_unreserve(sobj);
                }
                amdgpu_bo_unref(&sobj);
        }
        if (dobj) {
                r = amdgpu_bo_reserve(dobj, true);
                if (likely(r == 0)) {
                        amdgpu_bo_unpin(dobj);
                        amdgpu_bo_unreserve(dobj);
                }
                amdgpu_bo_unref(&dobj);
        }
}

void amdgpu_benchmark(struct amdgpu_device *adev, int test_number)
{
        int i;
        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
        };

        switch (test_number) {
        case 1:
                /* simple test, VRAM to GTT and GTT to VRAM */
                amdgpu_benchmark_move(adev, 1024*1024, AMDGPU_GEM_DOMAIN_GTT,
                                      AMDGPU_GEM_DOMAIN_VRAM);
                amdgpu_benchmark_move(adev, 1024*1024, AMDGPU_GEM_DOMAIN_VRAM,
                                      AMDGPU_GEM_DOMAIN_GTT);
                break;
        case 2:
                /* simple test, VRAM to VRAM */
                amdgpu_benchmark_move(adev, 1024*1024, AMDGPU_GEM_DOMAIN_VRAM,
                                      AMDGPU_GEM_DOMAIN_VRAM);
                break;
        case 3:
                /* GTT to VRAM, buffer size sweep, powers of 2 */
                for (i = 1; i <= 16384; i <<= 1)
                        amdgpu_benchmark_move(adev, i * AMDGPU_GPU_PAGE_SIZE,
                                              AMDGPU_GEM_DOMAIN_GTT,
                                              AMDGPU_GEM_DOMAIN_VRAM);
                break;
        case 4:
                /* VRAM to GTT, buffer size sweep, powers of 2 */
                for (i = 1; i <= 16384; i <<= 1)
                        amdgpu_benchmark_move(adev, i * AMDGPU_GPU_PAGE_SIZE,
                                              AMDGPU_GEM_DOMAIN_VRAM,
                                              AMDGPU_GEM_DOMAIN_GTT);
                break;
        case 5:
                /* VRAM to VRAM, buffer size sweep, powers of 2 */
                for (i = 1; i <= 16384; i <<= 1)
                        amdgpu_benchmark_move(adev, i * AMDGPU_GPU_PAGE_SIZE,
                                              AMDGPU_GEM_DOMAIN_VRAM,
                                              AMDGPU_GEM_DOMAIN_VRAM);
                break;
        case 6:
                /* GTT to VRAM, buffer size sweep, common modes */
                for (i = 0; i < AMDGPU_BENCHMARK_COMMON_MODES_N; i++)
                        amdgpu_benchmark_move(adev, common_modes[i],
                                              AMDGPU_GEM_DOMAIN_GTT,
                                              AMDGPU_GEM_DOMAIN_VRAM);
                break;
        case 7:
                /* VRAM to GTT, buffer size sweep, common modes */
                for (i = 0; i < AMDGPU_BENCHMARK_COMMON_MODES_N; i++)
                        amdgpu_benchmark_move(adev, common_modes[i],
                                              AMDGPU_GEM_DOMAIN_VRAM,
                                              AMDGPU_GEM_DOMAIN_GTT);
                break;
        case 8:
                /* VRAM to VRAM, buffer size sweep, common modes */
                for (i = 0; i < AMDGPU_BENCHMARK_COMMON_MODES_N; i++)
                        amdgpu_benchmark_move(adev, common_modes[i],
                                              AMDGPU_GEM_DOMAIN_VRAM,
                                              AMDGPU_GEM_DOMAIN_VRAM);
                break;

        default:
                DRM_ERROR("Unknown benchmark\n");
        }
}