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/*
* Userspace mediated device sample application
*
* Copyright (c) 2019, Nutanix Inc. All rights reserved.
* Author: Thanos Makatos <thanos@nutanix.com>
* Swapnil Ingle <swapnil.ingle@nutanix.com>
* Felipe Franciosi <felipe@nutanix.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of Nutanix nor the names of its contributors may be
* used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*
*/
/* gpio-pci-idio-16 */
#include <stdio.h>
#include <err.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <signal.h>
#include <errno.h>
#include "../lib/muser.h"
static void
_log(void *pvt, lm_log_lvl_t lvl __attribute__((unused)), char const *msg)
{
fprintf(stderr, "gpio: %s\n", msg);
}
ssize_t
bar2_access(void *pvt, char * const buf, size_t count, loff_t offset,
const bool is_write)
{
static char n;
if (offset == 0 && !is_write)
buf[0] = n++ / 3;
return count;
}
static void _sa_handler(int signum __attribute__((unused)))
{
}
static int
unmap_dma(void *pvt __attribute__((unused)),
uint64_t iova __attribute__((unused)))
{
}
int main(int argc, char *argv[])
{
int ret;
bool trans_sock = false, verbose = false;
char opt;
struct sigaction act = {.sa_handler = _sa_handler};
lm_ctx_t *lm_ctx;
while ((opt = getopt(argc, argv, "sv")) != -1) {
switch (opt) {
case 's':
trans_sock = true;
break;
case 'v':
verbose = true;
break;
default: /* '?' */
fprintf(stderr, "Usage: %s [-s] [-d] <IOMMU group>\n", argv[0]);
exit(EXIT_FAILURE);
}
}
if (optind >= argc) {
err(EXIT_FAILURE, "missing MUSER device UUID");
}
lm_dev_info_t dev_info = {
.trans = trans_sock ? LM_TRANS_SOCK : LM_TRANS_KERNEL,
.log = verbose ? _log : NULL,
.log_lvl = LM_DBG,
.pci_info = {
.id = {.vid = 0x494F, .did = 0x0DC8 },
.reg_info[LM_DEV_BAR2_REG_IDX] = {
.flags = LM_REG_FLAG_RW,
.size = 0x100,
.fn = &bar2_access
},
.irq_count[LM_DEV_INTX_IRQ_IDX] = 1,
},
.uuid = argv[optind],
/*
* Not strictly necessary since this device doesn't yet do any DMA.
* By declaring this dummy callback DMA regions get registered,
* otherwise they're ignored.
*/
.unmap_dma = unmap_dma
};
sigemptyset(&act.sa_mask);
if (sigaction(SIGINT, &act, NULL) == -1) {
fprintf(stderr, "warning: failed to register signal handler: %m\n");
}
lm_ctx = lm_ctx_create(&dev_info);
if (lm_ctx == NULL) {
if (errno == EINTR) {
goto out;
}
fprintf(stderr, "failed to initialize device emulation: %m\n");
return -1;
}
ret = lm_ctx_drive(lm_ctx);
if (ret != 0) {
if (ret != -ENOTCONN && ret != -EINTR) {
fprintf(stderr, "failed to realize device emulation: %m\n");
}
}
out:
lm_ctx_destroy(lm_ctx);
return ret;
}
/* ex: set tabstop=4 shiftwidth=4 softtabstop=4 expandtab: */
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