/*
 * Copyright © 2009,2011 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>
 *    Chris Wilson <chris@chris-wilson.co.uk>
 *
 */

/** @file gem_vmap_blits.c
 *
 * This is a test of doing many blits using a mixture of normal system pages
 * and uncached linear buffers, with a working set larger than the
 * aperture size.
 *
 * The goal is to simply ensure the basics work.
 */

#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_gpu_tools.h"

#if !defined(I915_PARAM_HAS_VMAP)
#warning No vmap support in drm, skipping
int main(int argc, char **argv)
{
	fprintf(stderr, "No vmap support in drm.\n");
	return 77;
}
#else

#define WIDTH 512
#define HEIGHT 512

static uint32_t linear[WIDTH*HEIGHT];

static uint32_t gem_vmap(int fd, void *ptr, int size, int read_only)
{
	struct drm_i915_gem_vmap vmap;

	vmap.user_ptr = (uintptr_t)ptr;
	vmap.user_size = size;
	vmap.flags = 0;
	if (read_only)
		vmap.flags |= I915_VMAP_READ_ONLY;

	if (drmIoctl(fd, DRM_IOCTL_I915_GEM_VMAP, &vmap))
		return 0;

	return vmap.handle;
}


static void gem_vmap_sync(int fd, uint32_t handle)
{
	gem_set_domain(fd, handle, I915_GEM_DOMAIN_CPU, I915_GEM_DOMAIN_CPU);
}

static void
gem_read(int fd, uint32_t handle, int offset, int size, void *buf)
{
	struct drm_i915_gem_pread pread;
	int ret;

	pread.handle = handle;
	pread.offset = offset;
	pread.size = size;
	pread.data_ptr = (uintptr_t)buf;
	ret = drmIoctl(fd, DRM_IOCTL_I915_GEM_PREAD, &pread);
	assert(ret == 0);
}

static void
copy(int fd, uint32_t dst, uint32_t src)
{
	uint32_t batch[10];
	struct drm_i915_gem_relocation_entry reloc[2];
	struct drm_i915_gem_exec_object2 obj[3];
	struct drm_i915_gem_execbuffer2 exec;
	uint32_t handle;
	int ret;

	batch[0] = XY_SRC_COPY_BLT_CMD |
		  XY_SRC_COPY_BLT_WRITE_ALPHA |
		  XY_SRC_COPY_BLT_WRITE_RGB;
	batch[1] = (3 << 24) | /* 32 bits */
		  (0xcc << 16) | /* copy ROP */
		  WIDTH*4;
	batch[2] = 0; /* dst x1,y1 */
	batch[3] = (HEIGHT << 16) | WIDTH; /* dst x2,y2 */
	batch[4] = 0; /* dst reloc */
	batch[5] = 0; /* src x1,y1 */
	batch[6] = WIDTH*4;
	batch[7] = 0; /* src reloc */
	batch[8] = MI_BATCH_BUFFER_END;
	batch[9] = MI_NOOP;

	handle = gem_create(fd, 4096);
	gem_write(fd, handle, 0, batch, sizeof(batch));

	reloc[0].target_handle = dst;
	reloc[0].delta = 0;
	reloc[0].offset = 4 * sizeof(batch[0]);
	reloc[0].presumed_offset = 0;
	reloc[0].read_domains = I915_GEM_DOMAIN_RENDER;;
	reloc[0].write_domain = I915_GEM_DOMAIN_RENDER;

	reloc[1].target_handle = src;
	reloc[1].delta = 0;
	reloc[1].offset = 7 * sizeof(batch[0]);
	reloc[1].presumed_offset = 0;
	reloc[1].read_domains = I915_GEM_DOMAIN_RENDER;;
	reloc[1].write_domain = 0;

	obj[0].handle = dst;
	obj[0].relocation_count = 0;
	obj[0].relocs_ptr = 0;
	obj[0].alignment = 0;
	obj[0].offset = 0;
	obj[0].flags = 0;
	obj[0].rsvd1 = 0;
	obj[0].rsvd2 = 0;

	obj[1].handle = src;
	obj[1].relocation_count = 0;
	obj[1].relocs_ptr = 0;
	obj[1].alignment = 0;
	obj[1].offset = 0;
	obj[1].flags = 0;
	obj[1].rsvd1 = 0;
	obj[1].rsvd2 = 0;

	obj[2].handle = handle;
	obj[2].relocation_count = 2;
	obj[2].relocs_ptr = (uintptr_t)reloc;
	obj[2].alignment = 0;
	obj[2].offset = 0;
	obj[2].flags = 0;
	obj[2].rsvd1 = obj[2].rsvd2 = 0;

	exec.buffers_ptr = (uintptr_t)obj;
	exec.buffer_count = 3;
	exec.batch_start_offset = 0;
	exec.batch_len = sizeof(batch);
	exec.DR1 = exec.DR4 = 0;
	exec.num_cliprects = 0;
	exec.cliprects_ptr = 0;
	exec.flags = HAS_BLT_RING(intel_get_drm_devid(fd)) ? I915_EXEC_BLT : 0;
	exec.rsvd1 = exec.rsvd2 = 0;

	ret = drmIoctl(fd, DRM_IOCTL_I915_GEM_EXECBUFFER2, &exec);
	while (ret && errno == EBUSY) {
		drmCommandNone(fd, DRM_I915_GEM_THROTTLE);
		ret = drmIoctl(fd, DRM_IOCTL_I915_GEM_EXECBUFFER2, &exec);
	}
	assert(ret == 0);

	gem_close(fd, handle);
}

static uint32_t
create_vmap(int fd, uint32_t val, uint32_t *ptr)
{
	uint32_t handle;
	int i;

	handle = gem_vmap(fd, ptr, sizeof(linear), 0);

	/* Fill the BO with dwords starting at val */
	for (i = 0; i < WIDTH*HEIGHT; i++)
		ptr[i] = val++;

	return handle;
}

static uint32_t
create_bo(int fd, uint32_t val)
{
	uint32_t handle;
	int i;

	handle = gem_create(fd, sizeof(linear));

	/* Fill the BO with dwords starting at val */
	for (i = 0; i < WIDTH*HEIGHT; i++)
		linear[i] = val++;
	gem_write(fd, handle, 0, linear, sizeof(linear));

	return handle;
}

static void
check_cpu(uint32_t *ptr, uint32_t val)
{
	int i;

	for (i = 0; i < WIDTH*HEIGHT; i++) {
		if (ptr[i] != val) {
			fprintf(stderr, "Expected 0x%08x, found 0x%08x "
				"at offset 0x%08x\n",
				val, ptr[i], i * 4);
			abort();
		}
		val++;
	}
}

static void
check_gpu(int fd, uint32_t handle, uint32_t val)
{
	gem_read(fd, handle, 0, linear, sizeof(linear));
	check_cpu(linear, val);
}

static int has_vmap(int fd)
{
	drm_i915_getparam_t gp;
	int i;

	gp.param = I915_PARAM_HAS_VMAP;
	gp.value = &i;

	return drmIoctl(fd, DRM_IOCTL_I915_GETPARAM, &gp) == 0 && i > 0;
}

int main(int argc, char **argv)
{
	uint32_t *memory;
	uint32_t *cpu, *cpu_val;
	uint32_t *gpu, *gpu_val;
	uint32_t start = 0;
	int i, fd, count;

	fd = drm_open_any();

	if (!has_vmap(fd)) {
		fprintf(stderr, "No vmap support, ignoring.\n");
		return 77;
	}

	count = 0;
	if (argc > 1)
		count = atoi(argv[1]);
	if (count == 0)
		count = 3 * gem_aperture_size(fd) / (1024*1024) / 4;
	printf("Using 2x%d 1MiB buffers\n", count);

	memory = malloc(count*sizeof(linear));
	if (memory == NULL) {
		fprintf(stderr, "Unable to allocate %lld bytes\n",
			(long long)count*sizeof(linear));
		return 1;
	}

	gpu = malloc(sizeof(uint32_t)*count*4);
	gpu_val = gpu + count;
	cpu = gpu_val + count;
	cpu_val = cpu + count;

	for (i = 0; i < count; i++) {
		gpu[i] = create_bo(fd, start);
		gpu_val[i] = start;
		start += WIDTH*HEIGHT;
	}

	for (i = 0; i < count; i++) {
		cpu[i] = create_vmap(fd, start, memory+i*WIDTH*HEIGHT);
		cpu_val[i] = start;
		start += WIDTH*HEIGHT;;
	}

	printf("Verifying initialisation...\n");
	for (i = 0; i < count; i++) {
		check_gpu(fd, gpu[i], gpu_val[i]);
		check_cpu(memory+i*WIDTH*HEIGHT, cpu_val[i]);
	}

	printf("Cyclic blits cpu->gpu, forward...\n");
	for (i = 0; i < count * 4; i++) {
		int src = i % count;
		int dst = (i + 1) % count;

		copy(fd, gpu[dst], cpu[src]);
		gpu_val[dst] = cpu_val[src];
	}
	for (i = 0; i < count; i++)
		check_gpu(fd, gpu[i], gpu_val[i]);

	printf("Cyclic blits gpu->cpu, backward...\n");
	for (i = 0; i < count * 4; i++) {
		int src = (i + 1) % count;
		int dst = i % count;

		copy(fd, cpu[dst], gpu[src]);
		cpu_val[dst] = gpu_val[src];
	}
	for (i = 0; i < count; i++) {
		gem_vmap_sync(fd, cpu[i]);
		check_cpu(memory+i*WIDTH*HEIGHT, cpu_val[i]);
	}

	printf("Random blits...\n");
	for (i = 0; i < count * 4; i++) {
		int src = random() % count;
		int dst = random() % count;

		if (random() & 1) {
			copy(fd, gpu[dst], cpu[src]);
			gpu_val[dst] = cpu_val[src];
		} else {
			copy(fd, cpu[dst], gpu[src]);
			cpu_val[dst] = gpu_val[src];
		}
	}
	for (i = 0; i < count; i++) {
		check_gpu(fd, gpu[i], gpu_val[i]);
		gem_vmap_sync(fd, cpu[i]);
		check_cpu(memory+i*WIDTH*HEIGHT, cpu_val[i]);
	}

	return 0;
}

#endif