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
  37 #ifdef HAVE_PIPE_LOADER_XCB
  38
  39 #include <xcb/dri2.h>
  40
  41 #endif
  42
  43 #include "loader.h"
  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 #define DRM_RENDER_NODE_DEV_NAME_FORMAT "%s/renderD%d"
  52 #define DRM_RENDER_NODE_MAX_NODES 63
  53 #define DRM_RENDER_NODE_MIN_MINOR 128
  54 #define DRM_RENDER_NODE_MAX_MINOR (DRM_RENDER_NODE_MIN_MINOR + DRM_RENDER_NODE_MAX_NODES)
  55
  56 struct pipe_loader_drm_device {
  57    struct pipe_loader_device base;
  58    struct util_dl_library *lib;
  59    int fd;
  60 };
  61
  62 #define pipe_loader_drm_device(dev) ((struct pipe_loader_drm_device *)dev)
  63
  64 static struct pipe_loader_ops pipe_loader_drm_ops;
  65
  66 #ifdef HAVE_PIPE_LOADER_XCB
  67
  68 static xcb_screen_t *
  69 get_xcb_screen(xcb_screen_iterator_t iter, int screen)
  70 {
  71     for (; iter.rem; --screen, xcb_screen_next(&iter))
  72         if (screen == 0)
  73             return iter.data;
  74
  75     return NULL;
  76 }
  77
  78 #endif
  79
  80 static void
  81 pipe_loader_drm_x_auth(int fd)
  82 {
  83 #ifdef HAVE_PIPE_LOADER_XCB
  84    /* Try authenticate with the X server to give us access to devices that X
  85     * is running on. */
  86    xcb_connection_t *xcb_conn;
  87    const xcb_setup_t *xcb_setup;
  88    xcb_screen_iterator_t s;
  89    xcb_dri2_connect_cookie_t connect_cookie;
  90    xcb_dri2_connect_reply_t *connect;
  91    drm_magic_t magic;
  92    xcb_dri2_authenticate_cookie_t authenticate_cookie;
  93    xcb_dri2_authenticate_reply_t *authenticate;
  94    int screen;
  95
  96    xcb_conn = xcb_connect(NULL, &screen);
  97
  98    if(!xcb_conn)
  99       return;
 100
 101    xcb_setup = xcb_get_setup(xcb_conn);
 102
 103   if (!xcb_setup)
 104     goto disconnect;
 105
 106    s = xcb_setup_roots_iterator(xcb_setup);
 107    connect_cookie = xcb_dri2_connect_unchecked(xcb_conn,
 108                                                get_xcb_screen(s, screen)->root,
 109                                                XCB_DRI2_DRIVER_TYPE_DRI);
 110    connect = xcb_dri2_connect_reply(xcb_conn, connect_cookie, NULL);
 111
 112    if (!connect || connect->driver_name_length
 113                    + connect->device_name_length == 0) {
 114
 115       goto disconnect;
 116    }
 117
 118    if (drmGetMagic(fd, &magic))
 119       goto disconnect;
 120
 121    authenticate_cookie = xcb_dri2_authenticate_unchecked(xcb_conn,
 122                                                          s.data->root,
 123                                                          magic);
 124    authenticate = xcb_dri2_authenticate_reply(xcb_conn,
 125                                               authenticate_cookie,
 126                                               NULL);
 127    FREE(authenticate);
 128
 129 disconnect:
 130    xcb_disconnect(xcb_conn);
 131
 132 #endif
 133 }
 134
 135 bool
 136 pipe_loader_drm_probe_fd(struct pipe_loader_device **dev, int fd,
 137                          boolean auth_x)
 138 {
 139    struct pipe_loader_drm_device *ddev = CALLOC_STRUCT(pipe_loader_drm_device);
 140    int vendor_id, chip_id;
 141
 142    if (!ddev)
 143       return false;
 144
 145    if (loader_get_pci_id_for_fd(fd, &vendor_id, &chip_id)) {
 146       ddev->base.type = PIPE_LOADER_DEVICE_PCI;
 147       ddev->base.u.pci.vendor_id = vendor_id;
 148       ddev->base.u.pci.chip_id = chip_id;
 149    } else {
 150       ddev->base.type = PIPE_LOADER_DEVICE_PLATFORM;
 151    }
 152    ddev->base.ops = &pipe_loader_drm_ops;
 153    ddev->fd = fd;
 154
 155    if (auth_x)
 156       pipe_loader_drm_x_auth(fd);
 157
 158    ddev->base.driver_name = loader_get_driver_for_fd(fd, _LOADER_GALLIUM);
 159    if (!ddev->base.driver_name)
 160       goto fail;
 161
 162    *dev = &ddev->base;
 163    return true;
 164
 165   fail:
 166    FREE(ddev);
 167    return false;
 168 }
 169
 170 static int
 171 open_drm_minor(int minor)
 172 {
 173    char path[PATH_MAX];
 174    snprintf(path, sizeof(path), DRM_DEV_NAME, DRM_DIR_NAME, minor);
 175    return open(path, O_RDWR, 0);
 176 }
 177
 178 static int
 179 open_drm_render_node_minor(int minor)
 180 {
 181    char path[PATH_MAX];
 182    snprintf(path, sizeof(path), DRM_RENDER_NODE_DEV_NAME_FORMAT, DRM_DIR_NAME,
 183             minor);
 184    return open(path, O_RDWR, 0);
 185 }
 186
 187 int
 188 pipe_loader_drm_probe(struct pipe_loader_device **devs, int ndev)
 189 {
 190    int i, k, fd, num_render_node_devs;
 191    int j = 0;
 192
 193    struct {
 194       unsigned vendor_id;
 195       unsigned chip_id;
 196    } render_node_devs[DRM_RENDER_NODE_MAX_NODES];
 197
 198    /* Look for render nodes first */
 199    for (i = DRM_RENDER_NODE_MIN_MINOR, j = 0;
 200         i <= DRM_RENDER_NODE_MAX_MINOR; i++) {
 201       fd = open_drm_render_node_minor(i);
 202       struct pipe_loader_device *dev;
 203       if (fd < 0)
 204          continue;
 205
 206       if (!pipe_loader_drm_probe_fd(&dev, fd, false)) {
 207          close(fd);
 208          continue;
 209       }
 210
 211       render_node_devs[j].vendor_id = dev->u.pci.vendor_id;
 212       render_node_devs[j].chip_id = dev->u.pci.chip_id;
 213
 214       if (j < ndev) {
 215          devs[j] = dev;
 216       } else {
 217          close(fd);
 218          dev->ops->release(&dev);
 219       }
 220       j++;
 221    }
 222
 223    num_render_node_devs = j;
 224
 225    /* Next look for drm devices. */
 226    for (i = 0; i < DRM_MAX_MINOR; i++) {
 227       struct pipe_loader_device *dev;
 228       boolean duplicate = FALSE;
 229       fd = open_drm_minor(i);
 230       if (fd < 0)
 231          continue;
 232
 233       if (!pipe_loader_drm_probe_fd(&dev, fd, true)) {
 234          close(fd);
 235          continue;
 236       }
 237
 238       /* Check to make sure we aren't already accessing this device via
 239        * render nodes.
 240        */
 241       for (k = 0; k < num_render_node_devs; k++) {
 242          if (dev->u.pci.vendor_id == render_node_devs[k].vendor_id &&
 243              dev->u.pci.chip_id == render_node_devs[k].chip_id) {
 244             close(fd);
 245             dev->ops->release(&dev);
 246             duplicate = TRUE;
 247             break;
 248          }
 249       }
 250
 251       if (duplicate)
 252          continue;
 253
 254       if (j < ndev) {
 255          devs[j] = dev;
 256       } else {
 257          dev->ops->release(&dev);
 258       }
 259
 260       j++;
 261    }
 262
 263    return j;
 264 }
 265
 266 static void
 267 pipe_loader_drm_release(struct pipe_loader_device **dev)
 268 {
 269    struct pipe_loader_drm_device *ddev = pipe_loader_drm_device(*dev);
 270
 271    if (ddev->lib)
 272       util_dl_close(ddev->lib);
 273
 274    close(ddev->fd);
 275    FREE(ddev->base.driver_name);
 276    FREE(ddev);
 277    *dev = NULL;
 278 }
 279
 280 static const struct drm_conf_ret *
 281 pipe_loader_drm_configuration(struct pipe_loader_device *dev,
 282                               enum drm_conf conf)
 283 {
 284    struct pipe_loader_drm_device *ddev = pipe_loader_drm_device(dev);
 285    const struct drm_driver_descriptor *dd;
 286
 287    if (!ddev->lib)
 288       return NULL;
 289
 290    dd = (const struct drm_driver_descriptor *)
 291       util_dl_get_proc_address(ddev->lib, "driver_descriptor");
 292
 293    /* sanity check on the name */
 294    if (!dd || strcmp(dd->name, ddev->base.driver_name) != 0)
 295       return NULL;
 296
 297    if (!dd->configuration)
 298       return NULL;
 299
 300    return dd->configuration(conf);
 301 }
 302
 303 static struct pipe_screen *
 304 pipe_loader_drm_create_screen(struct pipe_loader_device *dev,
 305                               const char *library_paths)
 306 {
 307    struct pipe_loader_drm_device *ddev = pipe_loader_drm_device(dev);
 308    const struct drm_driver_descriptor *dd;
 309
 310    if (!ddev->lib)
 311       ddev->lib = pipe_loader_find_module(dev, library_paths);
 312    if (!ddev->lib)
 313       return NULL;
 314
 315    dd = (const struct drm_driver_descriptor *)
 316       util_dl_get_proc_address(ddev->lib, "driver_descriptor");
 317
 318    /* sanity check on the name */
 319    if (!dd || strcmp(dd->name, ddev->base.driver_name) != 0)
 320       return NULL;
 321
 322    return dd->create_screen(ddev->fd);
 323 }
 324
 325 static struct pipe_loader_ops pipe_loader_drm_ops = {
 326    .create_screen = pipe_loader_drm_create_screen,
 327    .configuration = pipe_loader_drm_configuration,
 328    .release = pipe_loader_drm_release
 329 };