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