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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2021, Intel Corporation.
*
* Sohil Mehta <[email protected]>
*/
#define _GNU_SOURCE
#include <stdio.h>
#include <x86gprintrin.h>
#include <pthread.h>
#include <signal.h>
#include <sys/sysinfo.h>
#include <sys/wait.h>
#include "uintr_common.h"
unsigned int client_received;
unsigned int server_received;
unsigned int count = 100000;
unsigned int nprocs;
unsigned int start_cpu;
static void __attribute__((interrupt)) client_handler(struct __uintr_frame *ui_frame,
unsigned long long vector)
{
client_received = 1;
}
static void __attribute__((interrupt)) server_handler(struct __uintr_frame *ui_frame,
unsigned long long vector)
{
server_received = 1;
}
static void wait_for_interrupt(unsigned int *interrupt_received_flag)
{
/* TODO: Add alternate to test with usleep() */
while (!(*interrupt_received_flag))
cpu_relax();
}
static void client_process_bi(int server_fd, int sock)
{
int uipi_index;
int client_fd;
ssize_t size;
uipi_index = uintr_register_sender(server_fd, 0);
if (uipi_index < 0) {
printf("[SKIP]\t%s:%d\n", __func__, __LINE__);
exit(EXIT_FAILURE);
}
if (uintr_register_handler(client_handler, 0)) {
printf("[SKIP]\t%s:%d\n", __func__, __LINE__);
return;
}
/* Create uintr_fd with vector 1 */
client_fd = uintr_create_fd(1, 0);
if (client_fd < 0) {
printf("[SKIP]\t%s:%d\n", __func__, __LINE__);
return;
}
_stui();
/* Share client_fd */
if (sock_fd_write(sock, "1", 1, client_fd) != 1) {
printf("[SKIP]\t%s:%d\n", __func__, __LINE__);
return;
}
do {
wait_for_interrupt(&client_received);
client_received = 0;
_senduipi(uipi_index);
} while (1);
}
static void test_process_ipi_bidirectional(int i)
{
int server_fd, client_fd, uipi_index, pid;
char buf[16];
ssize_t size;
int sv[2];
cpu_set_t cpuset;
CPU_ZERO(&cpuset);
CPU_SET((start_cpu + (i % nprocs)) % get_nprocs(), &cpuset);
if (sched_setaffinity(0, sizeof(cpuset), &cpuset) != 0) {
printf("[SKIP]\t%s:%d\n", __func__, __LINE__);
return;
}
if (socketpair(AF_LOCAL, SOCK_STREAM, 0, sv) < 0) {
printf("[SKIP]\t%s:%d\n", __func__, __LINE__);
return;
}
if (uintr_register_handler(server_handler, 0)) {
printf("[SKIP]\t%s:%d\n", __func__, __LINE__);
return;
}
/* Create uintr_fd with vector 0 */
server_fd = uintr_create_fd(0, 0);
if (server_fd < 0) {
printf("[SKIP]\t%s:%d\n", __func__, __LINE__);
return;
}
_stui();
printf("\tStarting Server-Client pair: %d\n", i);
pid = fork();
if (pid == 0) {
/* Child client process */
close(sv[0]);
CPU_ZERO(&cpuset);
CPU_SET((start_cpu + ((i + 1) % nprocs)) % get_nprocs(), &cpuset);
if (sched_setaffinity(0, sizeof(cpuset), &cpuset) != 0) {
printf("[SKIP]\t%s:%d\n", __func__, __LINE__);
return;
}
client_process_bi(server_fd, sv[1]);
exit(EXIT_SUCCESS);
}
close(sv[1]);
if (sock_fd_read(sv[0], buf, sizeof(buf), &client_fd) != 1) {
printf("[SKIP]\t%s:%d\n", __func__, __LINE__);
return;
}
//Register server as sender
uipi_index = uintr_register_sender(client_fd, 0);
if (uipi_index < 0) {
printf("[SKIP]\t%s:%d\n", __func__, __LINE__);
return;
}
do {
server_received = 0;
_senduipi(uipi_index);
wait_for_interrupt(&server_received);
} while (count--);
uintr_unregister_handler(0);
kill(pid, SIGKILL);
if (server_received)
printf("[OK]\tAll interrupts received: pair: %d\n", i);
else
printf("[FAIL]\tInterrupt not received: pair: %d\n", i);
exit(EXIT_SUCCESS);
}
int main(int argc, char *argv[])
{
int num_forks, i, c, pairs;
int *pid = NULL;
if (!uintr_supported())
return EXIT_SUCCESS;
nprocs = get_nprocs();
pairs = nprocs * 2;
srand(time(NULL));
start_cpu = rand() % get_nprocs();
while ((c = getopt(argc, argv, "c:i:p:")) != EOF) {
switch (c) {
case 'c':
nprocs = atoi(optarg);
if (nprocs > get_nprocs())
nprocs = get_nprocs();
break;
case 'i':
count = atoi(optarg);
break;
case 'p':
pairs = atoi(optarg);
break;
default:
break;
}
}
printf("[RUN]\tContext switch IPC test\n");
pid = malloc(sizeof(int) * pairs);
if (!pid) {
printf("[SKIP]\t%s:%d\n", __func__, __LINE__);
return EXIT_SUCCESS;
}
printf("\tServer-Client pairs:%d Number of cpus:%d Iterations per pair:%d\n",
pairs, nprocs, count);
for (i = 0; i < pairs; i++) {
pid[i] = fork();
if (pid[i] == 0) {
test_process_ipi_bidirectional(i);
break;
}
}
for (i = 0; i < pairs; i++)
waitpid(pid[i], NULL, 0);
return EXIT_SUCCESS;
}
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