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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 2025 Oxide Computer Company
*/
/*
* Facilitate access to the AMD Zen data fabric
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <err.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <strings.h>
#include <zen_udf.h>
static void
udf_readone(int fd, uint8_t inst, uint8_t func, uint16_t reg,
zen_udf_flags_t flags)
{
int ret;
zen_udf_io_t zui;
bzero(&zui, sizeof (zui));
zui.zui_flags = flags;
zui.zui_inst = inst;
zui.zui_func = func;
zui.zui_reg = reg;
ret = ioctl(fd, ZEN_UDF_READ, &zui);
if (ret != 0) {
err(EXIT_FAILURE, "failed to issue read ioctl");
}
if ((flags & ZEN_UDF_F_BCAST) == 0) {
(void) printf("ifr %x/%x/%x: 0x%" PRIx64 "\n",
inst, func, reg, zui.zui_data);
} else {
(void) printf("ifr bcast/%x/%x: 0x%" PRIx64 "\n",
func, reg, zui.zui_data);
}
}
int
main(int argc, char *argv[])
{
int c, fd;
const char *device = NULL;
const char *funcstr = NULL;
const char *inststr = NULL;
const char *regstr = NULL;
zen_udf_flags_t flags = 0;
uint8_t func, inst = UINT8_MAX;
uint16_t reg;
unsigned long lval;
char *eptr;
while ((c = getopt(argc, argv, "d:f:bi:r:l")) != -1) {
switch (c) {
case 'd':
device = optarg;
break;
case 'f':
funcstr = optarg;
break;
case 'b':
flags |= ZEN_UDF_F_BCAST;
break;
case 'i':
inststr = optarg;
break;
case 'l':
flags |= ZEN_UDF_F_64;
break;
case 'r':
regstr = optarg;
break;
}
}
if (device == NULL || funcstr == NULL || regstr == NULL ||
(inststr == NULL && (flags & ZEN_UDF_F_BCAST) == 0)) {
warnx("missing required arguments");
(void) fprintf(stderr, "Usage: "
"\tudf \t[-l] -d device -f func -b -r reg\n"
"\t\t[-l] -d device -f func -i inst -r reg\n");
exit(2);
}
errno = 0;
lval = strtoul(funcstr, &eptr, 0);
if (errno != 0 || lval > UINT8_MAX || *eptr != '\0') {
errx(EXIT_FAILURE, "failed to parse -f: %s", funcstr);
}
func = (uint8_t)lval;
if ((flags & ZEN_UDF_F_BCAST) == 0) {
lval = strtoul(inststr, &eptr, 0);
if (errno != 0 || lval > UINT8_MAX || *eptr != '\0') {
errx(EXIT_FAILURE, "failed to parse -i: %s", inststr);
}
inst = (uint8_t)lval;
} else if (inststr != NULL) {
errx(EXIT_FAILURE, "pass just one of -b or -i inst");
}
lval = strtoul(regstr, &eptr, 0);
if (errno != 0 || lval > UINT16_MAX || *eptr != '\0') {
errx(EXIT_FAILURE, "failed to parse -r: %s", regstr);
}
reg = (uint16_t)lval;
if ((fd = open(device, O_RDONLY)) < 0) {
err(EXIT_FAILURE, "failed to open %s", device);
}
udf_readone(fd, inst, func, reg, flags);
(void) close(fd);
return (0);
}
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