src/loader/loader.c

   1 /*
   2  * Copyright (C) 2013 Rob Clark <robclark@freedesktop.org>
   3  * Copyright (C) 2014-2016 Emil Velikov <emil.l.velikov@gmail.com>
   4  * Copyright (C) 2016 Intel Corporation
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the "Software"),
   8  * to deal in the Software without restriction, including without limitation
   9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  10  * and/or sell copies of the Software, and to permit persons to whom the
  11  * Software is furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice (including the next
  14  * paragraph) shall be included in all copies or substantial portions of the
  15  * Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  21  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  22  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  23  * SOFTWARE.
  24  *
  25  * Authors:
  26  *    Rob Clark <robclark@freedesktop.org>
  27  */
  28
  29 #include <errno.h>
  30 #include <fcntl.h>
  31 #include <sys/stat.h>
  32 #include <stdarg.h>
  33 #include <stdio.h>
  34 #include <stdbool.h>
  35 #include <string.h>
  36 #include <unistd.h>
  37 #include <stdlib.h>
  38 #ifdef MAJOR_IN_MKDEV
  39 #include <sys/mkdev.h>
  40 #endif
  41 #ifdef MAJOR_IN_SYSMACROS
  42 #include <sys/sysmacros.h>
  43 #endif
  44 #include "loader.h"
  45
  46 #ifdef HAVE_LIBDRM
  47 #include <xf86drm.h>
  48 #ifdef USE_DRICONF
  49 #include "util/xmlconfig.h"
  50 #include "util/xmlpool.h"
  51 #endif
  52 #endif
  53
  54 #define __IS_LOADER
  55 #include "pci_id_driver_map.h"
  56
  57 static void default_logger(int level, const char *fmt, ...)
  58 {
  59    if (level <= _LOADER_WARNING) {
  60       va_list args;
  61       va_start(args, fmt);
  62       vfprintf(stderr, fmt, args);
  63       va_end(args);
  64    }
  65 }
  66
  67 static void (*log_)(int level, const char *fmt, ...) = default_logger;
  68
  69 int
  70 loader_open_device(const char *device_name)
  71 {
  72    int fd;
  73 #ifdef O_CLOEXEC
  74    fd = open(device_name, O_RDWR | O_CLOEXEC);
  75    if (fd == -1 && errno == EINVAL)
  76 #endif
  77    {
  78       fd = open(device_name, O_RDWR);
  79       if (fd != -1)
  80          fcntl(fd, F_SETFD, fcntl(fd, F_GETFD) | FD_CLOEXEC);
  81    }
  82    return fd;
  83 }
  84
  85 #if defined(HAVE_LIBDRM)
  86 #ifdef USE_DRICONF
  87 static const char __driConfigOptionsLoader[] =
  88 DRI_CONF_BEGIN
  89     DRI_CONF_SECTION_INITIALIZATION
  90         DRI_CONF_DEVICE_ID_PATH_TAG()
  91     DRI_CONF_SECTION_END
  92 DRI_CONF_END;
  93
  94 static char *loader_get_dri_config_device_id(void)
  95 {
  96    driOptionCache defaultInitOptions;
  97    driOptionCache userInitOptions;
  98    char *prime = NULL;
  99
 100    driParseOptionInfo(&defaultInitOptions, __driConfigOptionsLoader);
 101    driParseConfigFiles(&userInitOptions, &defaultInitOptions, 0, "loader");
 102    if (driCheckOption(&userInitOptions, "device_id", DRI_STRING))
 103       prime = strdup(driQueryOptionstr(&userInitOptions, "device_id"));
 104    driDestroyOptionCache(&userInitOptions);
 105    driDestroyOptionInfo(&defaultInitOptions);
 106
 107    return prime;
 108 }
 109 #endif
 110
 111 static char *drm_construct_id_path_tag(drmDevicePtr device)
 112 {
 113    char *tag = NULL;
 114
 115    if (device->bustype == DRM_BUS_PCI) {
 116       if (asprintf(&tag, "pci-%04x_%02x_%02x_%1u",
 117                    device->businfo.pci->domain,
 118                    device->businfo.pci->bus,
 119                    device->businfo.pci->dev,
 120                    device->businfo.pci->func) < 0) {
 121          return NULL;
 122       }
 123    } else if (device->bustype == DRM_BUS_PLATFORM ||
 124               device->bustype == DRM_BUS_HOST1X) {
 125       char *fullname, *name, *address;
 126
 127       if (device->bustype == DRM_BUS_PLATFORM)
 128          fullname = device->businfo.platform->fullname;
 129       else
 130          fullname = device->businfo.host1x->fullname;
 131
 132       name = strrchr(fullname, '/');
 133       if (!name)
 134          name = strdup(fullname);
 135       else
 136          name = strdup(name + 1);
 137
 138       address = strchr(name, '@');
 139       if (address) {
 140          *address++ = '\0';
 141
 142          if (asprintf(&tag, "platform-%s_%s", address, name) < 0)
 143             tag = NULL;
 144       } else {
 145          if (asprintf(&tag, "platform-%s", name) < 0)
 146             tag = NULL;
 147       }
 148
 149       free(name);
 150    }
 151    return tag;
 152 }
 153
 154 static bool drm_device_matches_tag(drmDevicePtr device, const char *prime_tag)
 155 {
 156    char *tag = drm_construct_id_path_tag(device);
 157    int ret;
 158
 159    if (tag == NULL)
 160       return false;
 161
 162    ret = strcmp(tag, prime_tag);
 163
 164    free(tag);
 165    return ret == 0;
 166 }
 167
 168 static char *drm_get_id_path_tag_for_fd(int fd)
 169 {
 170    drmDevicePtr device;
 171    char *tag;
 172
 173    if (drmGetDevice2(fd, 0, &device) != 0)
 174        return NULL;
 175
 176    tag = drm_construct_id_path_tag(device);
 177    drmFreeDevice(&device);
 178    return tag;
 179 }
 180
 181 int loader_get_user_preferred_fd(int default_fd, bool *different_device)
 182 {
 183 /* Arbitrary "maximum" value of drm devices. */
 184 #define MAX_DRM_DEVICES 32
 185    const char *dri_prime = getenv("DRI_PRIME");
 186    char *default_tag, *prime = NULL;
 187    drmDevicePtr devices[MAX_DRM_DEVICES];
 188    int i, num_devices, fd;
 189    bool found = false;
 190
 191    if (dri_prime)
 192       prime = strdup(dri_prime);
 193 #ifdef USE_DRICONF
 194    else
 195       prime = loader_get_dri_config_device_id();
 196 #endif
 197
 198    if (prime == NULL) {
 199       *different_device = false;
 200       return default_fd;
 201    }
 202
 203    default_tag = drm_get_id_path_tag_for_fd(default_fd);
 204    if (default_tag == NULL)
 205       goto err;
 206
 207    num_devices = drmGetDevices2(0, devices, MAX_DRM_DEVICES);
 208    if (num_devices < 0)
 209       goto err;
 210
 211    /* two format are supported:
 212     * "1": choose any other card than the card used by default.
 213     * id_path_tag: (for example "pci-0000_02_00_0") choose the card
 214     * with this id_path_tag.
 215     */
 216    if (!strcmp(prime,"1")) {
 217       /* Hmm... detection for 2-7 seems to be broken. Oh well ...
 218        * Pick the first render device that is not our own.
 219        */
 220       for (i = 0; i < num_devices; i++) {
 221          if (devices[i]->available_nodes & 1 << DRM_NODE_RENDER &&
 222              !drm_device_matches_tag(devices[i], default_tag)) {
 223
 224             found = true;
 225             break;
 226          }
 227       }
 228    } else {
 229       for (i = 0; i < num_devices; i++) {
 230          if (devices[i]->available_nodes & 1 << DRM_NODE_RENDER &&
 231             drm_device_matches_tag(devices[i], prime)) {
 232
 233             found = true;
 234             break;
 235          }
 236       }
 237    }
 238
 239    if (!found) {
 240       drmFreeDevices(devices, num_devices);
 241       goto err;
 242    }
 243
 244    fd = loader_open_device(devices[i]->nodes[DRM_NODE_RENDER]);
 245    drmFreeDevices(devices, num_devices);
 246    if (fd < 0)
 247       goto err;
 248
 249    close(default_fd);
 250
 251    *different_device = !!strcmp(default_tag, prime);
 252
 253    free(default_tag);
 254    free(prime);
 255    return fd;
 256
 257  err:
 258    *different_device = false;
 259
 260    free(default_tag);
 261    free(prime);
 262    return default_fd;
 263 }
 264 #else
 265 int loader_get_user_preferred_fd(int default_fd, bool *different_device)
 266 {
 267    *different_device = false;
 268    return default_fd;
 269 }
 270 #endif
 271
 272 #if defined(HAVE_LIBDRM)
 273
 274 static int
 275 drm_get_pci_id_for_fd(int fd, int *vendor_id, int *chip_id)
 276 {
 277    drmDevicePtr device;
 278    int ret;
 279
 280    if (drmGetDevice2(fd, 0, &device) == 0) {
 281       if (device->bustype == DRM_BUS_PCI) {
 282          *vendor_id = device->deviceinfo.pci->vendor_id;
 283          *chip_id = device->deviceinfo.pci->device_id;
 284          ret = 1;
 285       }
 286       else {
 287          log_(_LOADER_DEBUG, "MESA-LOADER: device is not located on the PCI bus\n");
 288          ret = 0;
 289       }
 290       drmFreeDevice(&device);
 291    }
 292    else {
 293       log_(_LOADER_WARNING, "MESA-LOADER: failed to retrieve device information\n");
 294       ret = 0;
 295    }
 296
 297    return ret;
 298 }
 299 #endif
 300
 301
 302 int
 303 loader_get_pci_id_for_fd(int fd, int *vendor_id, int *chip_id)
 304 {
 305 #if HAVE_LIBDRM
 306    if (drm_get_pci_id_for_fd(fd, vendor_id, chip_id))
 307       return 1;
 308 #endif
 309    return 0;
 310 }
 311
 312 char *
 313 loader_get_device_name_for_fd(int fd)
 314 {
 315    char *result = NULL;
 316
 317 #if HAVE_LIBDRM
 318    result = drmGetDeviceNameFromFd2(fd);
 319 #endif
 320
 321    return result;
 322 }
 323
 324 char *
 325 loader_get_driver_for_fd(int fd)
 326 {
 327    int vendor_id, chip_id, i, j;
 328    char *driver = NULL;
 329
 330    /* Allow an environment variable to force choosing a different driver
 331     * binary.  If that driver binary can't survive on this FD, that's the
 332     * user's problem, but this allows vc4 simulator to run on an i965 host,
 333     * and may be useful for some touch testing of i915 on an i965 host.
 334     */
 335    if (geteuid() == getuid()) {
 336       driver = getenv("MESA_LOADER_DRIVER_OVERRIDE");
 337       if (driver)
 338          return strdup(driver);
 339    }
 340
 341    if (!loader_get_pci_id_for_fd(fd, &vendor_id, &chip_id)) {
 342
 343 #if HAVE_LIBDRM
 344       /* fallback to drmGetVersion(): */
 345       drmVersionPtr version = drmGetVersion(fd);
 346
 347       if (!version) {
 348          log_(_LOADER_WARNING, "failed to get driver name for fd %d\n", fd);
 349          return NULL;
 350       }
 351
 352       driver = strndup(version->name, version->name_len);
 353       log_(_LOADER_INFO, "using driver %s for %d\n", driver, fd);
 354
 355       drmFreeVersion(version);
 356 #endif
 357
 358       return driver;
 359    }
 360
 361    for (i = 0; driver_map[i].driver; i++) {
 362       if (vendor_id != driver_map[i].vendor_id)
 363          continue;
 364
 365       if (driver_map[i].predicate && !driver_map[i].predicate(fd))
 366          continue;
 367
 368       if (driver_map[i].num_chips_ids == -1) {
 369          driver = strdup(driver_map[i].driver);
 370          goto out;
 371       }
 372
 373       for (j = 0; j < driver_map[i].num_chips_ids; j++)
 374          if (driver_map[i].chip_ids[j] == chip_id) {
 375             driver = strdup(driver_map[i].driver);
 376             goto out;
 377          }
 378    }
 379
 380 out:
 381    log_(driver ? _LOADER_DEBUG : _LOADER_WARNING,
 382          "pci id for fd %d: %04x:%04x, driver %s\n",
 383          fd, vendor_id, chip_id, driver);
 384    return driver;
 385 }
 386
 387 void
 388 loader_set_logger(void (*logger)(int level, const char *fmt, ...))
 389 {
 390    log_ = logger;
 391 }
 392
 393 /* XXX: Local definition to avoid pulling the heavyweight GL/gl.h and
 394  * GL/internal/dri_interface.h
 395  */
 396
 397 #ifndef __DRI_DRIVER_GET_EXTENSIONS
 398 #define __DRI_DRIVER_GET_EXTENSIONS "__driDriverGetExtensions"
 399 #endif
 400
 401 char *
 402 loader_get_extensions_name(const char *driver_name)
 403 {
 404    char *name = NULL;
 405
 406    if (asprintf(&name, "%s_%s", __DRI_DRIVER_GET_EXTENSIONS, driver_name) < 0)
 407       return NULL;
 408
 409    const size_t len = strlen(name);
 410    for (size_t i = 0; i < len; i++) {
 411            if (name[i] == '-')
 412                    name[i] = '_';
 413    }
 414
 415    return name;
 416 }