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 #define DRIVER_MAP_GALLIUM_ONLY
  52 #include "pci_ids/pci_id_driver_map.h"
  53
  54 struct pipe_loader_drm_device {
  55    struct pipe_loader_device base;
  56    struct util_dl_library *lib;
  57    int fd;
  58 };
  59
  60 #define pipe_loader_drm_device(dev) ((struct pipe_loader_drm_device *)dev)
  61
  62 static boolean
  63 find_drm_pci_id(struct pipe_loader_drm_device *ddev)
  64 {
  65    struct udev *udev = NULL;
  66    struct udev_device *parent, *device = NULL;
  67    struct stat stat;
  68    const char *pci_id;
  69
  70    if (fstat(ddev->fd, &stat) < 0)
  71       goto fail;
  72
  73    udev = udev_new();
  74    if (!udev)
  75       goto fail;
  76
  77    device = udev_device_new_from_devnum(udev, 'c', stat.st_rdev);
  78    if (!device)
  79       goto fail;
  80
  81    parent = udev_device_get_parent(device);
  82    if (!parent)
  83       goto fail;
  84
  85    pci_id = udev_device_get_property_value(parent, "PCI_ID");
  86    if (!pci_id ||
  87        sscanf(pci_id, "%x:%x", &ddev->base.u.pci.vendor_id,
  88               &ddev->base.u.pci.chip_id) != 2)
  89       goto fail;
  90
  91    udev_device_unref(device);
  92    udev_unref(udev);
  93
  94    return TRUE;
  95
  96   fail:
  97    if (device)
  98       udev_device_unref(device);
  99    if (udev)
 100       udev_unref(udev);
 101
 102    return FALSE;
 103 }
 104
 105 static boolean
 106 find_drm_driver_name(struct pipe_loader_drm_device *ddev)
 107 {
 108    struct pipe_loader_device *dev = &ddev->base;
 109    int i, j;
 110
 111    for (i = 0; driver_map[i].driver; i++) {
 112       if (dev->u.pci.vendor_id != driver_map[i].vendor_id)
 113          continue;
 114
 115       if (driver_map[i].num_chips_ids == -1) {
 116          dev->driver_name = driver_map[i].driver;
 117          goto found;
 118       }
 119
 120       for (j = 0; j < driver_map[i].num_chips_ids; j++) {
 121          if (dev->u.pci.chip_id == driver_map[i].chip_ids[j]) {
 122             dev->driver_name = driver_map[i].driver;
 123             goto found;
 124          }
 125       }
 126    }
 127
 128    return FALSE;
 129
 130   found:
 131    return TRUE;
 132 }
 133
 134 static struct pipe_loader_ops pipe_loader_drm_ops;
 135
 136 static void
 137 pipe_loader_drm_x_auth(int fd)
 138 {
 139 #if HAVE_PIPE_LOADER_XCB
 140    /* Try authenticate with the X server to give us access to devices that X
 141     * is running on. */
 142    xcb_connection_t *xcb_conn;
 143    const xcb_setup_t *xcb_setup;
 144    xcb_screen_iterator_t s;
 145    xcb_dri2_connect_cookie_t connect_cookie;
 146    xcb_dri2_connect_reply_t *connect;
 147    drm_magic_t magic;
 148    xcb_dri2_authenticate_cookie_t authenticate_cookie;
 149    xcb_dri2_authenticate_reply_t *authenticate;
 150
 151    xcb_conn = xcb_connect(NULL,  NULL);
 152
 153    if(!xcb_conn)
 154       return;
 155
 156    xcb_setup = xcb_get_setup(xcb_conn);
 157
 158   if (!xcb_setup)
 159     goto disconnect;
 160
 161    s = xcb_setup_roots_iterator(xcb_setup);
 162    connect_cookie = xcb_dri2_connect_unchecked(xcb_conn, s.data->root,
 163                                                XCB_DRI2_DRIVER_TYPE_DRI);
 164    connect = xcb_dri2_connect_reply(xcb_conn, connect_cookie, NULL);
 165
 166    if (!connect || connect->driver_name_length
 167                    + connect->device_name_length == 0) {
 168
 169       goto disconnect;
 170    }
 171
 172    if (drmGetMagic(fd, &magic))
 173       goto disconnect;
 174
 175    authenticate_cookie = xcb_dri2_authenticate_unchecked(xcb_conn,
 176                                                          s.data->root,
 177                                                          magic);
 178    authenticate = xcb_dri2_authenticate_reply(xcb_conn,
 179                                               authenticate_cookie,
 180                                               NULL);
 181    FREE(authenticate);
 182
 183 disconnect:
 184    xcb_disconnect(xcb_conn);
 185
 186 #endif
 187 }
 188
 189 boolean
 190 pipe_loader_drm_probe_fd(struct pipe_loader_device **dev, int fd)
 191 {
 192    struct pipe_loader_drm_device *ddev = CALLOC_STRUCT(pipe_loader_drm_device);
 193
 194    ddev->base.type = PIPE_LOADER_DEVICE_PCI;
 195    ddev->base.ops = &pipe_loader_drm_ops;
 196    ddev->fd = fd;
 197
 198    pipe_loader_drm_x_auth(fd);
 199
 200    if (!find_drm_pci_id(ddev))
 201       goto fail;
 202
 203    if (!find_drm_driver_name(ddev))
 204       goto fail;
 205
 206    *dev = &ddev->base;
 207    return TRUE;
 208
 209   fail:
 210    FREE(ddev);
 211    return FALSE;
 212 }
 213
 214 static int
 215 open_drm_minor(int minor)
 216 {
 217    char path[PATH_MAX];
 218    snprintf(path, sizeof(path), DRM_DEV_NAME, DRM_DIR_NAME, minor);
 219    return open(path, O_RDWR, 0);
 220 }
 221
 222 int
 223 pipe_loader_drm_probe(struct pipe_loader_device **devs, int ndev)
 224 {
 225    int i, j, fd;
 226
 227    for (i = 0, j = 0; i < DRM_MAX_MINOR; i++) {
 228       fd = open_drm_minor(i);
 229       if (fd < 0)
 230          continue;
 231
 232       if (j >= ndev || !pipe_loader_drm_probe_fd(&devs[j], fd))
 233          close(fd);
 234
 235       j++;
 236    }
 237
 238    return j;
 239 }
 240
 241 static void
 242 pipe_loader_drm_release(struct pipe_loader_device **dev)
 243 {
 244    struct pipe_loader_drm_device *ddev = pipe_loader_drm_device(*dev);
 245
 246    if (ddev->lib)
 247       util_dl_close(ddev->lib);
 248
 249    close(ddev->fd);
 250    FREE(ddev);
 251    *dev = NULL;
 252 }
 253
 254 static struct pipe_screen *
 255 pipe_loader_drm_create_screen(struct pipe_loader_device *dev,
 256                               const char *library_paths)
 257 {
 258    struct pipe_loader_drm_device *ddev = pipe_loader_drm_device(dev);
 259    const struct drm_driver_descriptor *dd;
 260
 261    if (!ddev->lib)
 262       ddev->lib = pipe_loader_find_module(dev, library_paths);
 263    if (!ddev->lib)
 264       return NULL;
 265
 266    dd = (const struct drm_driver_descriptor *)
 267       util_dl_get_proc_address(ddev->lib, "driver_descriptor");
 268
 269    /* sanity check on the name */
 270    if (!dd || strcmp(dd->name, ddev->base.driver_name) != 0)
 271       return NULL;
 272
 273    return dd->create_screen(ddev->fd);
 274 }
 275
 276 static struct pipe_loader_ops pipe_loader_drm_ops = {
 277    .create_screen = pipe_loader_drm_create_screen,
 278    .release = pipe_loader_drm_release
 279 };