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/*
* This file and its contents are supplied under the terms of the
* Common Development and Distribution License ("CDDL"), version 1.0.
* You may only use this file in accordance with the terms of version
* 1.0 of the CDDL.
*
* A full copy of the text of the CDDL should have accompanied this
* source. A copy of the CDDL is also available via the Internet at
* http://www.illumos.org/license/CDDL.
*/
/*
* Copyright 2019 Joyent, Inc.
*/
/*
* Private command to manipulate link speeds of PCIe bridges and allow
* retraining. This is designed to aid debugging.
*/
#include <unistd.h>
#include <stdarg.h>
#include <stdio.h>
#include <libgen.h>
#include <string.h>
#include <err.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <pcieb_ioctl.h>
static const char *pcieb_progname;
static void
pcieb_usage(const char *fmt, ...)
{
if (fmt != NULL) {
va_list ap;
(void) fprintf(stderr, "%s: ", pcieb_progname);
va_start(ap, fmt);
(void) vfprintf(stderr, fmt, ap);
va_end(ap);
}
(void) fprintf(stderr, "Usage: %s [-x] [-s speed] pcie-bridge\n"
"\n"
"\t-s speed Set link to speed\n",
"\t-x Retrain link\n",
pcieb_progname);
}
static uint32_t
pcieb_parse_speed(const char *s)
{
if (strcasecmp(s, "2.5") == 0 || strcasecmp(s, "gen1") == 0) {
return (PCIEB_LINK_SPEED_GEN1);
} else if (strcasecmp(s, "5") == 0 || strcasecmp(s, "gen2") == 0) {
return (PCIEB_LINK_SPEED_GEN2);
} else if (strcasecmp(s, "8") == 0 || strcasecmp(s, "gen3") == 0) {
return (PCIEB_LINK_SPEED_GEN3);
} else if (strcasecmp(s, "16") == 0 || strcasecmp(s, "gen4") == 0) {
return (PCIEB_LINK_SPEED_GEN4);
} else {
errx(EXIT_FAILURE, "invalid speed: %s", s);
}
}
int
main(int argc, char *argv[])
{
int c;
boolean_t retrain = B_FALSE;
boolean_t set = B_FALSE;
boolean_t get = B_TRUE;
uint32_t speed = PCIEB_LINK_SPEED_UNKNOWN;
int fd;
pcieb_progname = basename(argv[0]);
while ((c = getopt(argc, argv, ":xs:")) != -1) {
switch (c) {
case 's':
speed = pcieb_parse_speed(optarg);
set = B_TRUE;
get = B_FALSE;
break;
case 'x':
retrain = B_TRUE;
get = B_FALSE;
break;
case ':':
pcieb_usage("option -%c requires an operand\n", optopt);
return (2);
case '?':
default:
pcieb_usage("unknown option: -%c\n", optopt);
return (2);
}
}
argc -= optind;
argv += optind;
if (argc != 1) {
pcieb_usage("missing required PCIe bridge device\n");
return (2);
}
if ((fd = open(argv[0], O_RDWR)) < 0) {
err(EXIT_FAILURE, "failed to open %s", argv[0]);
}
if (set) {
pcieb_ioctl_target_speed_t pits;
pits.pits_flags = 0;
pits.pits_speed = speed;
if (ioctl(fd, PCIEB_IOCTL_SET_TARGET_SPEED, &pits) != 0) {
err(EXIT_FAILURE, "failed to set target speed");
}
}
if (retrain) {
if (ioctl(fd, PCIEB_IOCTL_RETRAIN) != 0) {
err(EXIT_FAILURE, "failed to retrain link");
}
}
if (get) {
pcieb_ioctl_target_speed_t pits;
if (ioctl(fd, PCIEB_IOCTL_GET_TARGET_SPEED, &pits) != 0) {
err(EXIT_FAILURE, "failed to get target speed");
}
(void) printf("Bridge target speed: ");
switch (pits.pits_speed) {
case PCIEB_LINK_SPEED_GEN1:
(void) printf("2.5 GT/s (gen1)\n");
break;
case PCIEB_LINK_SPEED_GEN2:
(void) printf("5.0 GT/s (gen2)\n");
break;
case PCIEB_LINK_SPEED_GEN3:
(void) printf("8.0 GT/s (gen3)\n");
break;
case PCIEB_LINK_SPEED_GEN4:
(void) printf("16.0 GT/s (gen4)\n");
break;
default:
(void) printf("Unknown Value: 0x%x\n", pits.pits_speed);
}
if ((pits.pits_flags & ~PCIEB_FLAGS_ADMIN_SET) != 0) {
(void) printf("Unknown flags: 0x%x\n", pits.pits_flags);
} else if ((pits.pits_flags & PCIEB_FLAGS_ADMIN_SET) != 0) {
(void) printf("Flags: Admin Set Speed\n");
}
}
(void) close(fd);
return (0);
}
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