/*
 * Copyright © 2009 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:
 *    Eric Anholt <eric@anholt.net>
 *
 */

/**
 * Roughly simulates repeatedly uploading frames of images, by uploading
 * the data all at once with pwrite, and then blitting it to another buffer.
 *
 * You might think of this like a movie player, but that wouldn't be entirely
 * accurate, since the access patterns of the memory would be different
 * (generally, smaller source image, upscaled, an thus different memory access
 * pattern in both texel fetch for the stretching and the destination writes).
 * However, some things like swfdec would be doing something like this since
 * they compute their data in host memory and upload the full sw rendered
 * frame.
 *
 * Additionally, those applications should be rendering at the screen refresh
 * rate, while this test has no limits, and so can get itself into the
 * working set larger than aperture size performance disaster.
 *
 * The current workload we have that does large drm_intel_bo_map()
 * uploads is texture upload for OpenGL (as it frequently is doing
 * reformatting as it uploads the user's data, making bo_subdata less
 * suitable)
 */

#define _GNU_SOURCE
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <assert.h>
#include <fcntl.h>
#include <inttypes.h>
#include <errno.h>
#include <sys/stat.h>
#include <sys/time.h>
#include "drm.h"
#include "i915_drm.h"
#include "drmtest.h"
#include "intel_bufmgr.h"
#include "intel_batchbuffer.h"
#include "intel_io.h"
#include "intel_chipset.h"

#define OBJECT_WIDTH	1280
#define OBJECT_HEIGHT	720


int vgem_fd;

const char g_sys_card_path_format[] =
"/sys/bus/platform/devices/vgem/drm/card%d";
const char g_dev_card_path_format[] =
"/dev/dri/card%d";

static int drm_open_vgem(void) {
	char *name;
	int i, fd;

	for (i = 0; i < 16; i++) {
		struct stat _stat;
		int ret;
		ret = asprintf(&name, g_sys_card_path_format, i);
		assert(ret != -1);

		if (stat(name, &_stat) == -1) {
			free(name);
			continue;
		}

		free(name);
		ret = asprintf(&name, g_dev_card_path_format, i);
		assert(ret != -1);

		fd = open(name, O_RDWR);
		free(name);
		if (fd == -1) {
			continue;
		}
		return fd;
	}
	return -1;
}

static void *mmap_dumb_bo(int fd, int handle, size_t size) {
	struct drm_mode_map_dumb mmap_arg;
	void *ptr;
	int ret;

	memset(&mmap_arg, 0, sizeof(mmap_arg));

	mmap_arg.handle = handle;

	ret = drmIoctl(fd, DRM_IOCTL_MODE_MAP_DUMB, &mmap_arg);
	assert(ret == 0);
	assert(mmap_arg.offset != 0);

	ptr = mmap(NULL, size, (PROT_READ|PROT_WRITE), MAP_SHARED, fd,
			mmap_arg.offset);

	assert(ptr != MAP_FAILED);

	return ptr;
}

	static double
get_time_in_secs(void)
{
	struct timeval tv;

	gettimeofday(&tv, NULL);

	return (double)tv.tv_sec + tv.tv_usec / 1000000.0;
}

static void
do_render(drm_intel_bufmgr *bufmgr, struct intel_batchbuffer *batch,
	  drm_intel_bo *dst_bo, int width, int height)
{
	uint32_t *data;
	drm_intel_bo *src_bo;
	int i, prime_fd;
	static uint32_t seed = 1;
  int x = 0;
	uint32_t vgem_bo;
	uint32_t *bo_ptr;
	volatile uint32_t *ptr;

	src_bo = drm_intel_bo_alloc(bufmgr, "src", width * height * 4, 4096);

	drm_intel_bo_gem_export_to_prime(src_bo, &prime_fd);
	if (drmPrimeFDToHandle(vgem_fd, prime_fd, &vgem_bo)) {
		fprintf(stderr, "failed to import handle\n");
		return;
	}

	bo_ptr = mmap_dumb_bo(vgem_fd, vgem_bo, width * height * 4);
	ptr = bo_ptr;

	for (i = 0; i < width * height; i++) {
		x = ptr[i];
	}

	munmap(bo_ptr, width * height * 4);

	/* Render the junk to the dst. */
	BLIT_COPY_BATCH_START(0);
	OUT_BATCH((3 << 24) | /* 32 bits */
		  (0xcc << 16) | /* copy ROP */
		  (width * 4) /* dst pitch */);
	OUT_BATCH(0); /* dst x1,y1 */
	OUT_BATCH((height << 16) | width); /* dst x2,y2 */
	OUT_RELOC(dst_bo, I915_GEM_DOMAIN_RENDER, I915_GEM_DOMAIN_RENDER, 0);
	OUT_BATCH(0); /* src x1,y1 */
	OUT_BATCH(width * 4); /* src pitch */
	OUT_RELOC(src_bo, I915_GEM_DOMAIN_RENDER, 0, 0);
	ADVANCE_BATCH();

	intel_batchbuffer_flush(batch);

	drm_intel_bo_unreference(src_bo);
}

int main(int argc, char **argv)
{
	int fd;
	int object_size = OBJECT_WIDTH * OBJECT_HEIGHT * 4;
	double start_time, end_time;
	drm_intel_bo *dst_bo;
	drm_intel_bufmgr *bufmgr;
	struct intel_batchbuffer *batch;
	int i;

	fd = drm_open_driver(DRIVER_INTEL);

	vgem_fd = drm_open_vgem();
	if (vgem_fd < 0) {
		fprintf(stderr, "failed to open vgem card\n");
		close(fd);
		return 1;
	}

	bufmgr = drm_intel_bufmgr_gem_init(fd, 4096);
	drm_intel_bufmgr_gem_enable_reuse(bufmgr);

	batch = intel_batchbuffer_alloc(bufmgr, intel_get_drm_devid(fd));

	dst_bo = drm_intel_bo_alloc(bufmgr, "dst", object_size, 4096);

	/* Prep loop to get us warmed up. */
	for (i = 0; i < 60; i++) {
		do_render(bufmgr, batch, dst_bo, OBJECT_WIDTH, OBJECT_HEIGHT);
	}
	drm_intel_bo_wait_rendering(dst_bo);

	/* Do the actual timing. */
	start_time = get_time_in_secs();
	for (i = 0; i < 200; i++) {
		do_render(bufmgr, batch, dst_bo, OBJECT_WIDTH, OBJECT_HEIGHT);
	}
	drm_intel_bo_wait_rendering(dst_bo);
	end_time = get_time_in_secs();

	printf("%d iterations in %.03f secs: %.01f MB/sec\n", i,
	       end_time - start_time,
	       (double)i * OBJECT_WIDTH * OBJECT_HEIGHT * 4 / 1024.0 / 1024.0 /
	       (end_time - start_time));

	intel_batchbuffer_free(batch);
	drm_intel_bufmgr_destroy(bufmgr);

	close(fd);

	return 0;
}