/**
 * Userspace PCI Endpoint Test Module
 *
 * Copyright (C) 2017 Texas Instruments
 * Author: Kishon Vijay Abraham I <kishon@ti.com>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 of
 * the License as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <errno.h>
#include <fcntl.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/ioctl.h>
#include <time.h>
#include <unistd.h>

#include <linux/pcitest.h>

#define BILLION 1E9

static char *result[] = { "NOT OKAY", "OKAY" };

struct pci_test {
        char            *device;
        char            barnum;
        bool            legacyirq;
        unsigned int    msinum;
        bool            read;
        bool            write;
        bool            copy;
        unsigned long   size;
};

static int run_test(struct pci_test *test)
{
        long ret;
        int fd;
        struct timespec start, end;
        double time;

        fd = open(test->device, O_RDWR);
        if (fd < 0) {
                perror("can't open PCI Endpoint Test device");
                return fd;
        }

        if (test->barnum >= 0 && test->barnum <= 5) {
                ret = ioctl(fd, PCITEST_BAR, test->barnum);
                fprintf(stdout, "BAR%d:\t\t", test->barnum);
                if (ret < 0)
                        fprintf(stdout, "TEST FAILED\n");
                else
                        fprintf(stdout, "%s\n", result[ret]);
        }

        if (test->legacyirq) {
                ret = ioctl(fd, PCITEST_LEGACY_IRQ, 0);
                fprintf(stdout, "LEGACY IRQ:\t");
                if (ret < 0)
                        fprintf(stdout, "TEST FAILED\n");
                else
                        fprintf(stdout, "%s\n", result[ret]);
        }

        if (test->msinum > 0 && test->msinum <= 32) {
                ret = ioctl(fd, PCITEST_MSI, test->msinum);
                fprintf(stdout, "MSI%d:\t\t", test->msinum);
                if (ret < 0)
                        fprintf(stdout, "TEST FAILED\n");
                else
                        fprintf(stdout, "%s\n", result[ret]);
        }

        if (test->write) {
                ret = ioctl(fd, PCITEST_WRITE, test->size);
                fprintf(stdout, "WRITE (%7ld bytes):\t\t", test->size);
                if (ret < 0)
                        fprintf(stdout, "TEST FAILED\n");
                else
                        fprintf(stdout, "%s\n", result[ret]);
        }

        if (test->read) {
                ret = ioctl(fd, PCITEST_READ, test->size);
                fprintf(stdout, "READ (%7ld bytes):\t\t", test->size);
                if (ret < 0)
                        fprintf(stdout, "TEST FAILED\n");
                else
                        fprintf(stdout, "%s\n", result[ret]);
        }

        if (test->copy) {
                ret = ioctl(fd, PCITEST_COPY, test->size);
                fprintf(stdout, "COPY (%7ld bytes):\t\t", test->size);
                if (ret < 0)
                        fprintf(stdout, "TEST FAILED\n");
                else
                        fprintf(stdout, "%s\n", result[ret]);
        }

        fflush(stdout);
}

int main(int argc, char **argv)
{
        int c;
        struct pci_test *test;

        test = calloc(1, sizeof(*test));
        if (!test) {
                perror("Fail to allocate memory for pci_test\n");
                return -ENOMEM;
        }

        /* since '0' is a valid BAR number, initialize it to -1 */
        test->barnum = -1;

        /* set default size as 100KB */
        test->size = 0x19000;

        /* set default endpoint device */
        test->device = "/dev/pci-endpoint-test.0";

        while ((c = getopt(argc, argv, "D:b:m:lrwcs:")) != EOF)
        switch (c) {
        case 'D':
                test->device = optarg;
                continue;
        case 'b':
                test->barnum = atoi(optarg);
                if (test->barnum < 0 || test->barnum > 5)
                        goto usage;
                continue;
        case 'l':
                test->legacyirq = true;
                continue;
        case 'm':
                test->msinum = atoi(optarg);
                if (test->msinum < 1 || test->msinum > 32)
                        goto usage;
                continue;
        case 'r':
                test->read = true;
                continue;
        case 'w':
                test->write = true;
                continue;
        case 'c':
                test->copy = true;
                continue;
        case 's':
                test->size = strtoul(optarg, NULL, 0);
                continue;
        case '?':
        case 'h':
        default:
usage:
                fprintf(stderr,
                        "usage: %s [options]\n"
                        "Options:\n"
                        "\t-D <dev>             PCI endpoint test device {default: /dev/pci-endpoint-test.0}\n"
                        "\t-b <bar num>         BAR test (bar number between 0..5)\n"
                        "\t-m <msi num>         MSI test (msi number between 1..32)\n"
                        "\t-l                   Legacy IRQ test\n"
                        "\t-r                   Read buffer test\n"
                        "\t-w                   Write buffer test\n"
                        "\t-c                   Copy buffer test\n"
                        "\t-s <size>            Size of buffer {default: 100KB}\n",
                        argv[0]);
                return -EINVAL;
        }

        run_test(test);
        return 0;
}