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/**
 * @brief Platform QoS sample COS association application
 *
 */

#include "pqos.h"

#include <ctype.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>

/**
 * Defines
 */
#define PQOS_MAX_CORES (1024)

/**
 * Number of cores selected for cache allocation association
 */
static int sel_l3ca_assoc_num = 0;

/**
 * Maintains a table of core and class_id that are selected in config string for
 * setting up allocation policy per core
 */
static struct {
        unsigned core;
        unsigned class_id;
} sel_l3ca_assoc_tab[PQOS_MAX_CORES];

/**
 * @brief Verifies and translates association config string into
 *        internal configuration.
 *
 * @param argc Number of arguments in input command
 * @param argv Input arguments for COS association
 */
static void
enforcement_get_input(int argc, char *argv[])
{
        int i = 0;

        if (argc < 2)
                sel_l3ca_assoc_num = 0;
        else if (!strcmp(argv[1], "-h") || !strcmp(argv[1], "-H")) {
                printf("Usage: %s [<COS#> <core1> <core2> <core3> ...]\n",
                       argv[0]);
                printf("Eg   : %s 1 1 3 6\n\n", argv[0]);
                sel_l3ca_assoc_num = 0;
        } else {
                for (i = 0; i < argc - 2; i++) {
                        sel_l3ca_assoc_tab[i].class_id =
                            (unsigned)atoi(argv[1]);
                        sel_l3ca_assoc_tab[i].core =
                            (unsigned)atoi(argv[i + 2]);
                }
                sel_l3ca_assoc_num = (int)i;
        }
}

/**
 * @brief Prints information about cache allocation settings in the system
 */
static void
print_allocation_config(void)
{
        int ret;
        unsigned i;
        unsigned l3cat_id_count, *l3cat_ids = NULL;
        const struct pqos_cpuinfo *p_cpu = NULL;
        const struct pqos_cap *p_cap = NULL;

        /* Get CMT capability and CPU info pointer */
        ret = pqos_cap_get(&p_cap, &p_cpu);
        if (ret != PQOS_RETVAL_OK) {
                printf("Error retrieving PQoS capabilities!\n");
                return;
        }
        /* Get CPU l3cat_id information to set COS */
        l3cat_ids = pqos_cpu_get_l3cat_ids(p_cpu, &l3cat_id_count);
        if (l3cat_ids == NULL) {
                printf("Error retrieving CPU socket information!\n");
                return;
        }
        for (i = 0; i < l3cat_id_count; i++) {
                unsigned *lcores = NULL;
                unsigned lcount = 0, n = 0;

                lcores = pqos_cpu_get_cores(p_cpu, l3cat_ids[i], &lcount);
                if (lcores == NULL || lcount == 0) {
                        printf("Error retrieving core information!\n");
                        free(lcores);
                        free(l3cat_ids);
                        return;
                }
                printf("Core information for socket %u:\n", l3cat_ids[i]);
                for (n = 0; n < lcount; n++) {
                        unsigned class_id = 0;

                        ret = pqos_alloc_assoc_get(lcores[n], &class_id);
                        if (ret == PQOS_RETVAL_OK)
                                printf("    Core %u => COS%u\n", lcores[n],
                                       class_id);
                        else
                                printf("    Core %u => ERROR\n", lcores[n]);
                }
                free(lcores);
        }
        free(l3cat_ids);
}
/**
 * @brief Sets up association between cores and allocation classes of service
 *
 * @return Number of associations made
 * @retval 0 no association made (nor requested)
 * @retval negative error
 * @retval positive success
 */
static int
set_allocation_assoc(void)
{
        int i;

        for (i = 0; i < sel_l3ca_assoc_num; i++) {
                int ret;

                ret = pqos_alloc_assoc_set(sel_l3ca_assoc_tab[i].core,
                                           sel_l3ca_assoc_tab[i].class_id);
                if (ret != PQOS_RETVAL_OK) {
                        printf("Setting allocation class of service "
                               "association failed!\n");
                        return -1;
                }
        }
        return sel_l3ca_assoc_num;
}

int
main(int argc, char *argv[])
{
        struct pqos_config cfg;
        int ret, exit_val = EXIT_SUCCESS;

        memset(&cfg, 0, sizeof(cfg));
        cfg.fd_log = STDOUT_FILENO;
        cfg.verbose = 0;
        /* PQoS Initialization - Check and initialize CAT and CMT capability */
        ret = pqos_init(&cfg);
        if (ret != PQOS_RETVAL_OK) {
                printf("Error initializing PQoS library!\n");
                exit_val = EXIT_FAILURE;
                goto error_exit;
        }

        /* Get input from user */
        enforcement_get_input(argc, argv);
        if (sel_l3ca_assoc_num) {
                /* Enforce COS to the associated cores */
                ret = set_allocation_assoc();
                if (ret < 0) {
                        printf("CAT association error!\n");
                        goto error_exit;
                }
                printf("Allocation configuration altered.\n");
        }
        /* Print COS and associated cores */
        print_allocation_config();
error_exit:
        /* reset and deallocate all the resources */
        ret = pqos_fini();
        if (ret != PQOS_RETVAL_OK)
                printf("Error shutting down PQoS library!\n");
        return exit_val;
}
