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/*
* Copyright © 2019 Red Hat
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
/* connect to an X server and work out the default device. */
#include <xcb/xcb.h>
#include <xcb/dri3.h>
#include <unistd.h>
#include <stdlib.h>
#include <fcntl.h>
#include <xf86drm.h>
#include "device_select.h"
static int
ds_dri3_open(xcb_connection_t *conn,
xcb_window_t root,
uint32_t provider)
{
xcb_dri3_open_cookie_t cookie;
xcb_dri3_open_reply_t *reply;
int fd;
cookie = xcb_dri3_open(conn,
root,
provider);
reply = xcb_dri3_open_reply(conn, cookie, NULL);
if (!reply)
return -1;
if (reply->nfd != 1) {
free(reply);
return -1;
}
fd = xcb_dri3_open_reply_fds(conn, reply)[0];
free(reply);
fcntl(fd, F_SETFD, fcntl(fd, F_GETFD) | FD_CLOEXEC);
return fd;
}
int device_select_find_xcb_pci_default(struct device_pci_info *devices, uint32_t device_count)
{
const xcb_setup_t *setup;
xcb_screen_iterator_t iter;
int scrn;
xcb_connection_t *conn;
int default_idx = -1;
drmDevicePtr xdev = NULL;
conn = xcb_connect(NULL, &scrn);
if (!conn)
return -1;
xcb_query_extension_cookie_t dri3_cookie;
xcb_query_extension_reply_t *dri3_reply = NULL;
dri3_cookie = xcb_query_extension(conn, 4, "DRI3");
dri3_reply = xcb_query_extension_reply(conn, dri3_cookie, NULL);
if (!dri3_reply)
goto out;
if (dri3_reply->present == 0)
goto out;
setup = xcb_get_setup(conn);
iter = xcb_setup_roots_iterator(setup);
xcb_screen_t *screen = iter.data;
int dri3_fd = ds_dri3_open(conn, screen->root, 0);
if (dri3_fd == -1)
goto out;
int ret = drmGetDevice2(dri3_fd, 0, &xdev);
close(dri3_fd);
if (ret < 0)
goto out;
for (unsigned i = 0; i < device_count; i++) {
if (devices[i].has_bus_info) {
if (xdev->businfo.pci->domain == devices[i].bus_info.domain &&
xdev->businfo.pci->bus == devices[i].bus_info.bus &&
xdev->businfo.pci->dev == devices[i].bus_info.dev &&
xdev->businfo.pci->func == devices[i].bus_info.func) {
default_idx = i;
}
} else {
if (xdev->deviceinfo.pci->vendor_id == devices[i].dev_info.vendor_id &&
xdev->deviceinfo.pci->device_id == devices[i].dev_info.device_id)
default_idx = i;
}
if (default_idx != -1)
break;
}
out:
free(dri3_reply);
drmFreeDevice(&xdev); /* Is NULL pointer safe. */
xcb_disconnect(conn);
return default_idx;
}
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