src/gallium/auxiliary/pipe-loader/pipe_loader_drm.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2011 Intel Corporation
   4  * Copyright 2012 Francisco Jerez
   5  * All Rights Reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the
   9  * "Software"), to deal in the Software without restriction, including
  10  * without limitation the rights to use, copy, modify, merge, publish,
  11  * distribute, sub license, and/or sell copies of the Software, and to
  12  * permit persons to whom the Software is furnished to do so, subject to
  13  * the following conditions:
  14  *
  15  * The above copyright notice and this permission notice (including the
  16  * next paragraph) shall be included in all copies or substantial portions
  17  * of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  20  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  21  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  22  * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
  23  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  24  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  25  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  26  *
  27  * Authors:
  28  *    Kristian Høgsberg <krh@bitplanet.net>
  29  *    Benjamin Franzke <benjaminfranzke@googlemail.com>
  30  *
  31  **************************************************************************/
  32
  33 #include <fcntl.h>
  34 #include <stdio.h>
  35 #include <libudev.h>
  36 #include <xf86drm.h>
  37
  38 #ifdef HAVE_PIPE_LOADER_XCB
  39
  40 #include <xcb/dri2.h>
  41
  42 #endif
  43
  44 #include "state_tracker/drm_driver.h"
  45 #include "pipe_loader_priv.h"
  46
  47 #include "util/u_memory.h"
  48 #include "util/u_dl.h"
  49 #include "util/u_debug.h"
  50
  51 struct pipe_loader_drm_device {
  52    struct pipe_loader_device base;
  53    struct util_dl_library *lib;
  54    int fd;
  55 };
  56
  57 #define pipe_loader_drm_device(dev) ((struct pipe_loader_drm_device *)dev)
  58
  59 static struct pipe_loader_ops pipe_loader_drm_ops;
  60
  61 static void
  62 pipe_loader_drm_x_auth(int fd)
  63 {
  64 #if HAVE_PIPE_LOADER_XCB
  65    /* Try authenticate with the X server to give us access to devices that X
  66     * is running on. */
  67    xcb_connection_t *xcb_conn;
  68    const xcb_setup_t *xcb_setup;
  69    xcb_screen_iterator_t s;
  70    xcb_dri2_connect_cookie_t connect_cookie;
  71    xcb_dri2_connect_reply_t *connect;
  72    drm_magic_t magic;
  73    xcb_dri2_authenticate_cookie_t authenticate_cookie;
  74    xcb_dri2_authenticate_reply_t *authenticate;
  75
  76    xcb_conn = xcb_connect(NULL,  NULL);
  77
  78    if(!xcb_conn)
  79       return;
  80
  81    xcb_setup = xcb_get_setup(xcb_conn);
  82
  83   if (!xcb_setup)
  84     goto disconnect;
  85
  86    s = xcb_setup_roots_iterator(xcb_setup);
  87    connect_cookie = xcb_dri2_connect_unchecked(xcb_conn, s.data->root,
  88                                                XCB_DRI2_DRIVER_TYPE_DRI);
  89    connect = xcb_dri2_connect_reply(xcb_conn, connect_cookie, NULL);
  90
  91    if (!connect || connect->driver_name_length
  92                    + connect->device_name_length == 0) {
  93
  94       goto disconnect;
  95    }
  96
  97    if (drmGetMagic(fd, &magic))
  98       goto disconnect;
  99
 100    authenticate_cookie = xcb_dri2_authenticate_unchecked(xcb_conn,
 101                                                          s.data->root,
 102                                                          magic);
 103    authenticate = xcb_dri2_authenticate_reply(xcb_conn,
 104                                               authenticate_cookie,
 105                                               NULL);
 106    FREE(authenticate);
 107
 108 disconnect:
 109    xcb_disconnect(xcb_conn);
 110
 111 #endif
 112 }
 113
 114 boolean
 115 pipe_loader_drm_probe_fd(struct pipe_loader_device **dev, int fd)
 116 {
 117    struct pipe_loader_drm_device *ddev = CALLOC_STRUCT(pipe_loader_drm_device);
 118    int vendor_id, chip_id;
 119
 120    if (loader_get_pci_id_for_fd(fd, &vendor_id, &chip_id)) {
 121       ddev->base.type = PIPE_LOADER_DEVICE_PCI;
 122       ddev->base.u.pci.vendor_id = vendor_id;
 123       ddev->base.u.pci.chip_id = chip_id;
 124    }
 125    ddev->base.ops = &pipe_loader_drm_ops;
 126    ddev->fd = fd;
 127
 128    pipe_loader_drm_x_auth(fd);
 129
 130    ddev->base.driver_name = loader_get_driver_for_fd(fd, _LOADER_GALLIUM);
 131    if (!ddev->base.driver_name)
 132       goto fail;
 133
 134    *dev = &ddev->base;
 135    return TRUE;
 136
 137   fail:
 138    FREE(ddev);
 139    return FALSE;
 140 }
 141
 142 static int
 143 open_drm_minor(int minor)
 144 {
 145    char path[PATH_MAX];
 146    snprintf(path, sizeof(path), DRM_DEV_NAME, DRM_DIR_NAME, minor);
 147    return open(path, O_RDWR, 0);
 148 }
 149
 150 int
 151 pipe_loader_drm_probe(struct pipe_loader_device **devs, int ndev)
 152 {
 153    int i, j, fd;
 154
 155    for (i = 0, j = 0; i < DRM_MAX_MINOR; i++) {
 156       fd = open_drm_minor(i);
 157       if (fd < 0)
 158          continue;
 159
 160       if (j >= ndev || !pipe_loader_drm_probe_fd(&devs[j], fd))
 161          close(fd);
 162
 163       j++;
 164    }
 165
 166    return j;
 167 }
 168
 169 static void
 170 pipe_loader_drm_release(struct pipe_loader_device **dev)
 171 {
 172    struct pipe_loader_drm_device *ddev = pipe_loader_drm_device(*dev);
 173
 174    if (ddev->lib)
 175       util_dl_close(ddev->lib);
 176
 177    close(ddev->fd);
 178    FREE(ddev);
 179    *dev = NULL;
 180 }
 181
 182 static struct pipe_screen *
 183 pipe_loader_drm_create_screen(struct pipe_loader_device *dev,
 184                               const char *library_paths)
 185 {
 186    struct pipe_loader_drm_device *ddev = pipe_loader_drm_device(dev);
 187    const struct drm_driver_descriptor *dd;
 188
 189    if (!ddev->lib)
 190       ddev->lib = pipe_loader_find_module(dev, library_paths);
 191    if (!ddev->lib)
 192       return NULL;
 193
 194    dd = (const struct drm_driver_descriptor *)
 195       util_dl_get_proc_address(ddev->lib, "driver_descriptor");
 196
 197    /* sanity check on the name */
 198    if (!dd || strcmp(dd->name, ddev->base.driver_name) != 0)
 199       return NULL;
 200
 201    return dd->create_screen(ddev->fd);
 202 }
 203
 204 static struct pipe_loader_ops pipe_loader_drm_ops = {
 205    .create_screen = pipe_loader_drm_create_screen,
 206    .release = pipe_loader_drm_release
 207 };