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 <xf86drm.h>
  36 #include <unistd.h>
  37
  38 #ifdef HAVE_PIPE_LOADER_XCB
  39
  40 #include <xcb/dri2.h>
  41
  42 #endif
  43
  44 #include "loader.h"
  45 #include "state_tracker/drm_driver.h"
  46 #include "pipe_loader_priv.h"
  47
  48 #include "util/u_memory.h"
  49 #include "util/u_dl.h"
  50 #include "util/u_debug.h"
  51
  52 #define DRM_RENDER_NODE_DEV_NAME_FORMAT "%s/renderD%d"
  53 #define DRM_RENDER_NODE_MAX_NODES 63
  54 #define DRM_RENDER_NODE_MIN_MINOR 128
  55 #define DRM_RENDER_NODE_MAX_MINOR (DRM_RENDER_NODE_MIN_MINOR + DRM_RENDER_NODE_MAX_NODES)
  56
  57 struct pipe_loader_drm_device {
  58    struct pipe_loader_device base;
  59    struct util_dl_library *lib;
  60    int fd;
  61 };
  62
  63 #define pipe_loader_drm_device(dev) ((struct pipe_loader_drm_device *)dev)
  64
  65 static struct pipe_loader_ops pipe_loader_drm_ops;
  66
  67 #ifdef HAVE_PIPE_LOADER_XCB
  68
  69 static xcb_screen_t *
  70 get_xcb_screen(xcb_screen_iterator_t iter, int screen)
  71 {
  72     for (; iter.rem; --screen, xcb_screen_next(&iter))
  73         if (screen == 0)
  74             return iter.data;
  75
  76     return NULL;
  77 }
  78
  79 #endif
  80
  81 static void
  82 pipe_loader_drm_x_auth(int fd)
  83 {
  84 #ifdef HAVE_PIPE_LOADER_XCB
  85    /* Try authenticate with the X server to give us access to devices that X
  86     * is running on. */
  87    xcb_connection_t *xcb_conn;
  88    const xcb_setup_t *xcb_setup;
  89    xcb_screen_iterator_t s;
  90    xcb_dri2_connect_cookie_t connect_cookie;
  91    xcb_dri2_connect_reply_t *connect;
  92    drm_magic_t magic;
  93    xcb_dri2_authenticate_cookie_t authenticate_cookie;
  94    xcb_dri2_authenticate_reply_t *authenticate;
  95    int screen;
  96
  97    xcb_conn = xcb_connect(NULL, &screen);
  98
  99    if(!xcb_conn)
 100       return;
 101
 102    xcb_setup = xcb_get_setup(xcb_conn);
 103
 104   if (!xcb_setup)
 105     goto disconnect;
 106
 107    s = xcb_setup_roots_iterator(xcb_setup);
 108    connect_cookie = xcb_dri2_connect_unchecked(xcb_conn,
 109                                                get_xcb_screen(s, screen)->root,
 110                                                XCB_DRI2_DRIVER_TYPE_DRI);
 111    connect = xcb_dri2_connect_reply(xcb_conn, connect_cookie, NULL);
 112
 113    if (!connect || connect->driver_name_length
 114                    + connect->device_name_length == 0) {
 115
 116       goto disconnect;
 117    }
 118
 119    if (drmGetMagic(fd, &magic))
 120       goto disconnect;
 121
 122    authenticate_cookie = xcb_dri2_authenticate_unchecked(xcb_conn,
 123                                                          s.data->root,
 124                                                          magic);
 125    authenticate = xcb_dri2_authenticate_reply(xcb_conn,
 126                                               authenticate_cookie,
 127                                               NULL);
 128    FREE(authenticate);
 129
 130 disconnect:
 131    xcb_disconnect(xcb_conn);
 132
 133 #endif
 134 }
 135
 136 bool
 137 pipe_loader_drm_probe_fd(struct pipe_loader_device **dev, int fd,
 138                          boolean auth_x)
 139 {
 140    struct pipe_loader_drm_device *ddev = CALLOC_STRUCT(pipe_loader_drm_device);
 141    int vendor_id, chip_id;
 142
 143    if (!ddev)
 144       return false;
 145
 146    if (loader_get_pci_id_for_fd(fd, &vendor_id, &chip_id)) {
 147       ddev->base.type = PIPE_LOADER_DEVICE_PCI;
 148       ddev->base.u.pci.vendor_id = vendor_id;
 149       ddev->base.u.pci.chip_id = chip_id;
 150    } else {
 151       ddev->base.type = PIPE_LOADER_DEVICE_PLATFORM;
 152    }
 153    ddev->base.ops = &pipe_loader_drm_ops;
 154    ddev->fd = fd;
 155
 156    if (auth_x)
 157       pipe_loader_drm_x_auth(fd);
 158
 159    ddev->base.driver_name = loader_get_driver_for_fd(fd, _LOADER_GALLIUM);
 160    if (!ddev->base.driver_name)
 161       goto fail;
 162
 163    *dev = &ddev->base;
 164    return true;
 165
 166   fail:
 167    FREE(ddev);
 168    return false;
 169 }
 170
 171 static int
 172 open_drm_render_node_minor(int minor)
 173 {
 174    char path[PATH_MAX];
 175    snprintf(path, sizeof(path), DRM_RENDER_NODE_DEV_NAME_FORMAT, DRM_DIR_NAME,
 176             minor);
 177    return open(path, O_RDWR, 0);
 178 }
 179
 180 int
 181 pipe_loader_drm_probe(struct pipe_loader_device **devs, int ndev)
 182 {
 183    int i, j, fd;
 184
 185    for (i = DRM_RENDER_NODE_MIN_MINOR, j = 0;
 186         i <= DRM_RENDER_NODE_MAX_MINOR; i++) {
 187       fd = open_drm_render_node_minor(i);
 188       struct pipe_loader_device *dev;
 189       if (fd < 0)
 190          continue;
 191
 192       if (!pipe_loader_drm_probe_fd(&dev, fd, false)) {
 193          close(fd);
 194          continue;
 195       }
 196
 197       if (j < ndev) {
 198          devs[j] = dev;
 199       } else {
 200          close(fd);
 201          dev->ops->release(&dev);
 202       }
 203       j++;
 204    }
 205
 206    return j;
 207 }
 208
 209 static void
 210 pipe_loader_drm_release(struct pipe_loader_device **dev)
 211 {
 212    struct pipe_loader_drm_device *ddev = pipe_loader_drm_device(*dev);
 213
 214    if (ddev->lib)
 215       util_dl_close(ddev->lib);
 216
 217    close(ddev->fd);
 218    FREE(ddev->base.driver_name);
 219    FREE(ddev);
 220    *dev = NULL;
 221 }
 222
 223 static const struct drm_conf_ret *
 224 pipe_loader_drm_configuration(struct pipe_loader_device *dev,
 225                               enum drm_conf conf)
 226 {
 227    struct pipe_loader_drm_device *ddev = pipe_loader_drm_device(dev);
 228    const struct drm_driver_descriptor *dd;
 229
 230    if (!ddev->lib)
 231       return NULL;
 232
 233    dd = (const struct drm_driver_descriptor *)
 234       util_dl_get_proc_address(ddev->lib, "driver_descriptor");
 235
 236    /* sanity check on the name */
 237    if (!dd || strcmp(dd->name, ddev->base.driver_name) != 0)
 238       return NULL;
 239
 240    if (!dd->configuration)
 241       return NULL;
 242
 243    return dd->configuration(conf);
 244 }
 245
 246 static struct pipe_screen *
 247 pipe_loader_drm_create_screen(struct pipe_loader_device *dev,
 248                               const char *library_paths)
 249 {
 250    struct pipe_loader_drm_device *ddev = pipe_loader_drm_device(dev);
 251    const struct drm_driver_descriptor *dd;
 252
 253    if (!ddev->lib)
 254       ddev->lib = pipe_loader_find_module(dev, library_paths);
 255    if (!ddev->lib)
 256       return NULL;
 257
 258    dd = (const struct drm_driver_descriptor *)
 259       util_dl_get_proc_address(ddev->lib, "driver_descriptor");
 260
 261    /* sanity check on the name */
 262    if (!dd || strcmp(dd->name, ddev->base.driver_name) != 0)
 263       return NULL;
 264
 265    return dd->create_screen(ddev->fd);
 266 }
 267
 268 static struct pipe_loader_ops pipe_loader_drm_ops = {
 269    .create_screen = pipe_loader_drm_create_screen,
 270    .configuration = pipe_loader_drm_configuration,
 271    .release = pipe_loader_drm_release
 272 };