src/vulkan/device-select-layer/device_select_x11.c

   1 /*
   2  * Copyright © 2019 Red Hat
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  21  * IN THE SOFTWARE.
  22  */
  23
  24 /* connect to an X server and work out the default device. */
  25
  26 #include <xcb/xcb.h>
  27 #include <xcb/dri3.h>
  28 #include <unistd.h>
  29 #include <stdlib.h>
  30 #include <fcntl.h>
  31 #include <xf86drm.h>
  32
  33 #include "device_select.h"
  34 static int
  35 ds_dri3_open(xcb_connection_t *conn,
  36              xcb_window_t root,
  37              uint32_t provider)
  38 {
  39    xcb_dri3_open_cookie_t       cookie;
  40    xcb_dri3_open_reply_t        *reply;
  41    int                          fd;
  42
  43    cookie = xcb_dri3_open(conn,
  44                           root,
  45                           provider);
  46
  47    reply = xcb_dri3_open_reply(conn, cookie, NULL);
  48    if (!reply)
  49       return -1;
  50
  51    if (reply->nfd != 1) {
  52       free(reply);
  53       return -1;
  54    }
  55
  56    fd = xcb_dri3_open_reply_fds(conn, reply)[0];
  57    free(reply);
  58    fcntl(fd, F_SETFD, fcntl(fd, F_GETFD) | FD_CLOEXEC);
  59
  60    return fd;
  61 }
  62
  63 int device_select_find_xcb_pci_default(struct device_pci_info *devices, uint32_t device_count)
  64 {
  65   const xcb_setup_t *setup;
  66   xcb_screen_iterator_t iter;
  67   int scrn;
  68   xcb_connection_t *conn;
  69   int default_idx = -1;
  70   conn = xcb_connect(NULL, &scrn);
  71   if (!conn)
  72     return -1;
  73
  74   xcb_query_extension_cookie_t dri3_cookie;
  75   xcb_query_extension_reply_t *dri3_reply;
  76
  77   dri3_cookie = xcb_query_extension(conn, 4, "DRI3");
  78   dri3_reply = xcb_query_extension_reply(conn, dri3_cookie, NULL);
  79
  80   if (!dri3_reply)
  81     goto out;
  82
  83   if (dri3_reply->present == 0)
  84     goto out;
  85   setup = xcb_get_setup(conn);
  86   iter = xcb_setup_roots_iterator(setup);
  87
  88   xcb_screen_t *screen = iter.data;
  89
  90   int dri3_fd = ds_dri3_open(conn, screen->root, 0);
  91   if (dri3_fd == -1)
  92     goto out;
  93
  94   drmDevicePtr xdev;
  95   int ret = drmGetDevice2(dri3_fd, 0, &xdev);
  96   if (ret < 0)
  97     goto out;
  98
  99   for (unsigned i = 0; i < device_count; i++) {
 100     if (devices[i].has_bus_info) {
 101       if (xdev->businfo.pci->domain == devices[i].bus_info.domain &&
 102           xdev->businfo.pci->bus == devices[i].bus_info.bus &&
 103           xdev->businfo.pci->dev == devices[i].bus_info.dev &&
 104           xdev->businfo.pci->func == devices[i].bus_info.func) {
 105         default_idx = i;
 106       }
 107     } else {
 108       if (xdev->deviceinfo.pci->vendor_id == devices[i].dev_info.vendor_id &&
 109           xdev->deviceinfo.pci->device_id == devices[i].dev_info.device_id)
 110         default_idx = i;
 111     }
 112     if (default_idx != -1)
 113       break;
 114   }
 115 out:
 116   xcb_disconnect(conn);
 117   return default_idx;
 118 }