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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 2021 Oxide Computer Company
*/
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/vmm_dev.h>
static void
usage(const char *pname)
{
fprintf(stderr,
"Usage: %s [-a add] [-r remove] [-q]\n"
"\t-a <SZ> add SZ MiB to the reservoir\n"
"\t-r <SZ> remove SZ MiB from the reservoir\n"
"\t-q query reservoir state\n", pname);
}
static bool
parse_size(const char *arg, size_t *resp)
{
size_t res;
errno = 0;
res = strtoul(arg, NULL, 0);
if (errno != 0) {
return (false);
}
*resp = (res * 1024 * 1024);
return (true);
}
static void
do_add(int fd, size_t sz)
{
int res;
res = ioctl(fd, VMM_RESV_ADD, sz);
if (res != 0) {
perror("Could not add to reservoir");
exit(EXIT_FAILURE);
}
}
static void
do_remove(int fd, size_t sz)
{
int res;
res = ioctl(fd, VMM_RESV_REMOVE, sz);
if (res != 0) {
perror("Could not remove from reservoir");
exit(EXIT_FAILURE);
}
}
static void
do_query(int fd)
{
struct vmm_resv_query data;
int res;
res = ioctl(fd, VMM_RESV_QUERY, &data);
if (res != 0) {
perror("Could not query reservoir info");
return;
}
printf("Free KiB:\t%llu\n"
"Allocated KiB:\t%llu\n"
"Transient Allocated KiB:\t%llu\n"
"Size limit KiB:\t%llu\n",
data.vrq_free_sz / 1024,
data.vrq_alloc_sz / 1024,
data.vrq_alloc_transient_sz / 1024,
data.vrq_limit / 1024);
}
int
main(int argc, char *argv[])
{
char c;
const char *opt_a = NULL, *opt_r = NULL;
bool opt_q = false;
int fd;
const char *pname = argv[0];
while ((c = getopt(argc, argv, "a:r:qh")) != -1) {
switch (c) {
case 'a':
opt_a = optarg;
break;
case 'r':
opt_r = optarg;
break;
case 'q':
opt_q = true;
break;
case 'h':
usage(pname);
return (EXIT_SUCCESS);
default:
usage(pname);
return (EXIT_FAILURE);
}
}
if (optind < argc ||
(opt_a == NULL && opt_r == NULL && !opt_q) ||
(opt_a != NULL && opt_r != NULL)) {
usage(pname);
return (EXIT_FAILURE);
}
fd = open(VMM_CTL_DEV, O_EXCL | O_RDWR);
if (fd < 0) {
perror("Could not open vmmctl");
usage(pname);
return (EXIT_FAILURE);
}
if (opt_a != NULL) {
size_t sz;
if (!parse_size(opt_a, &sz)) {
perror("Invalid size");
usage(pname);
return (EXIT_FAILURE);
}
do_add(fd, sz);
}
if (opt_r != NULL) {
size_t sz;
if (!parse_size(opt_r, &sz)) {
perror("Invalid size");
usage(pname);
return (EXIT_FAILURE);
}
do_remove(fd, sz);
}
if (opt_q) {
do_query(fd);
}
(void) close(fd);
return (0);
}
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