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 static char *loader_get_kernel_driver_name(int fd)
  86 {
  87 #if HAVE_LIBDRM
  88    char *driver;
  89    drmVersionPtr version = drmGetVersion(fd);
  90
  91    if (!version) {
  92       log_(_LOADER_WARNING, "failed to get driver name for fd %d\n", fd);
  93       return NULL;
  94    }
  95
  96    driver = strndup(version->name, version->name_len);
  97
  98    drmFreeVersion(version);
  99    return driver;
 100 #else
 101    return NULL;
 102 #endif
 103 }
 104
 105 #if defined(HAVE_LIBDRM)
 106 #ifdef USE_DRICONF
 107 static const char __driConfigOptionsLoader[] =
 108 DRI_CONF_BEGIN
 109     DRI_CONF_SECTION_INITIALIZATION
 110         DRI_CONF_DEVICE_ID_PATH_TAG()
 111     DRI_CONF_SECTION_END
 112 DRI_CONF_END;
 113
 114 static char *loader_get_dri_config_device_id(void)
 115 {
 116    driOptionCache defaultInitOptions;
 117    driOptionCache userInitOptions;
 118    char *prime = NULL;
 119
 120    driParseOptionInfo(&defaultInitOptions, __driConfigOptionsLoader);
 121    driParseConfigFiles(&userInitOptions, &defaultInitOptions, 0, "loader");
 122    if (driCheckOption(&userInitOptions, "device_id", DRI_STRING))
 123       prime = strdup(driQueryOptionstr(&userInitOptions, "device_id"));
 124    driDestroyOptionCache(&userInitOptions);
 125    driDestroyOptionInfo(&defaultInitOptions);
 126
 127    return prime;
 128 }
 129 #endif
 130
 131 static char *drm_construct_id_path_tag(drmDevicePtr device)
 132 {
 133    char *tag = NULL;
 134
 135    if (device->bustype == DRM_BUS_PCI) {
 136       if (asprintf(&tag, "pci-%04x_%02x_%02x_%1u",
 137                    device->businfo.pci->domain,
 138                    device->businfo.pci->bus,
 139                    device->businfo.pci->dev,
 140                    device->businfo.pci->func) < 0) {
 141          return NULL;
 142       }
 143    } else if (device->bustype == DRM_BUS_PLATFORM ||
 144               device->bustype == DRM_BUS_HOST1X) {
 145       char *fullname, *name, *address;
 146
 147       if (device->bustype == DRM_BUS_PLATFORM)
 148          fullname = device->businfo.platform->fullname;
 149       else
 150          fullname = device->businfo.host1x->fullname;
 151
 152       name = strrchr(fullname, '/');
 153       if (!name)
 154          name = strdup(fullname);
 155       else
 156          name = strdup(name + 1);
 157
 158       address = strchr(name, '@');
 159       if (address) {
 160          *address++ = '\0';
 161
 162          if (asprintf(&tag, "platform-%s_%s", address, name) < 0)
 163             tag = NULL;
 164       } else {
 165          if (asprintf(&tag, "platform-%s", name) < 0)
 166             tag = NULL;
 167       }
 168
 169       free(name);
 170    }
 171    return tag;
 172 }
 173
 174 static bool drm_device_matches_tag(drmDevicePtr device, const char *prime_tag)
 175 {
 176    char *tag = drm_construct_id_path_tag(device);
 177    int ret;
 178
 179    if (tag == NULL)
 180       return false;
 181
 182    ret = strcmp(tag, prime_tag);
 183
 184    free(tag);
 185    return ret == 0;
 186 }
 187
 188 static char *drm_get_id_path_tag_for_fd(int fd)
 189 {
 190    drmDevicePtr device;
 191    char *tag;
 192
 193    if (drmGetDevice2(fd, 0, &device) != 0)
 194        return NULL;
 195
 196    tag = drm_construct_id_path_tag(device);
 197    drmFreeDevice(&device);
 198    return tag;
 199 }
 200
 201 int loader_get_user_preferred_fd(int default_fd, bool *different_device)
 202 {
 203 /* Arbitrary "maximum" value of drm devices. */
 204 #define MAX_DRM_DEVICES 32
 205    const char *dri_prime = getenv("DRI_PRIME");
 206    char *default_tag, *prime = NULL;
 207    drmDevicePtr devices[MAX_DRM_DEVICES];
 208    int i, num_devices, fd;
 209    bool found = false;
 210
 211    if (dri_prime)
 212       prime = strdup(dri_prime);
 213 #ifdef USE_DRICONF
 214    else
 215       prime = loader_get_dri_config_device_id();
 216 #endif
 217
 218    if (prime == NULL) {
 219       *different_device = false;
 220       return default_fd;
 221    }
 222
 223    default_tag = drm_get_id_path_tag_for_fd(default_fd);
 224    if (default_tag == NULL)
 225       goto err;
 226
 227    num_devices = drmGetDevices2(0, devices, MAX_DRM_DEVICES);
 228    if (num_devices < 0)
 229       goto err;
 230
 231    /* two format are supported:
 232     * "1": choose any other card than the card used by default.
 233     * id_path_tag: (for example "pci-0000_02_00_0") choose the card
 234     * with this id_path_tag.
 235     */
 236    if (!strcmp(prime,"1")) {
 237       /* Hmm... detection for 2-7 seems to be broken. Oh well ...
 238        * Pick the first render device that is not our own.
 239        */
 240       for (i = 0; i < num_devices; i++) {
 241          if (devices[i]->available_nodes & 1 << DRM_NODE_RENDER &&
 242              !drm_device_matches_tag(devices[i], default_tag)) {
 243
 244             found = true;
 245             break;
 246          }
 247       }
 248    } else {
 249       for (i = 0; i < num_devices; i++) {
 250          if (devices[i]->available_nodes & 1 << DRM_NODE_RENDER &&
 251             drm_device_matches_tag(devices[i], prime)) {
 252
 253             found = true;
 254             break;
 255          }
 256       }
 257    }
 258
 259    if (!found) {
 260       drmFreeDevices(devices, num_devices);
 261       goto err;
 262    }
 263
 264    fd = loader_open_device(devices[i]->nodes[DRM_NODE_RENDER]);
 265    drmFreeDevices(devices, num_devices);
 266    if (fd < 0)
 267       goto err;
 268
 269    close(default_fd);
 270
 271    *different_device = !!strcmp(default_tag, prime);
 272
 273    free(default_tag);
 274    free(prime);
 275    return fd;
 276
 277  err:
 278    *different_device = false;
 279
 280    free(default_tag);
 281    free(prime);
 282    return default_fd;
 283 }
 284 #else
 285 int loader_get_user_preferred_fd(int default_fd, bool *different_device)
 286 {
 287    *different_device = false;
 288    return default_fd;
 289 }
 290 #endif
 291
 292 #if defined(HAVE_LIBDRM)
 293
 294 static int
 295 drm_get_pci_id_for_fd(int fd, int *vendor_id, int *chip_id)
 296 {
 297    drmDevicePtr device;
 298    int ret;
 299
 300    if (drmGetDevice2(fd, 0, &device) == 0) {
 301       if (device->bustype == DRM_BUS_PCI) {
 302          *vendor_id = device->deviceinfo.pci->vendor_id;
 303          *chip_id = device->deviceinfo.pci->device_id;
 304          ret = 1;
 305       }
 306       else {
 307          log_(_LOADER_DEBUG, "MESA-LOADER: device is not located on the PCI bus\n");
 308          ret = 0;
 309       }
 310       drmFreeDevice(&device);
 311    }
 312    else {
 313       log_(_LOADER_WARNING, "MESA-LOADER: failed to retrieve device information\n");
 314       ret = 0;
 315    }
 316
 317    return ret;
 318 }
 319 #endif
 320
 321
 322 int
 323 loader_get_pci_id_for_fd(int fd, int *vendor_id, int *chip_id)
 324 {
 325 #if HAVE_LIBDRM
 326    if (drm_get_pci_id_for_fd(fd, vendor_id, chip_id))
 327       return 1;
 328 #endif
 329    return 0;
 330 }
 331
 332 char *
 333 loader_get_device_name_for_fd(int fd)
 334 {
 335    char *result = NULL;
 336
 337 #if HAVE_LIBDRM
 338    result = drmGetDeviceNameFromFd2(fd);
 339 #endif
 340
 341    return result;
 342 }
 343
 344 char *
 345 loader_get_driver_for_fd(int fd)
 346 {
 347    int vendor_id, chip_id, i, j;
 348    char *driver = NULL;
 349
 350    /* Allow an environment variable to force choosing a different driver
 351     * binary.  If that driver binary can't survive on this FD, that's the
 352     * user's problem, but this allows vc4 simulator to run on an i965 host,
 353     * and may be useful for some touch testing of i915 on an i965 host.
 354     */
 355    if (geteuid() == getuid()) {
 356       driver = getenv("MESA_LOADER_DRIVER_OVERRIDE");
 357       if (driver)
 358          return strdup(driver);
 359    }
 360
 361    if (!loader_get_pci_id_for_fd(fd, &vendor_id, &chip_id)) {
 362       driver = loader_get_kernel_driver_name(fd);
 363       if (driver)
 364          log_(_LOADER_INFO, "using driver %s for %d\n", driver, fd);
 365       return driver;
 366    }
 367
 368    for (i = 0; driver_map[i].driver; i++) {
 369       if (vendor_id != driver_map[i].vendor_id)
 370          continue;
 371
 372       if (driver_map[i].predicate && !driver_map[i].predicate(fd))
 373          continue;
 374
 375       if (driver_map[i].num_chips_ids == -1) {
 376          driver = strdup(driver_map[i].driver);
 377          goto out;
 378       }
 379
 380       for (j = 0; j < driver_map[i].num_chips_ids; j++)
 381          if (driver_map[i].chip_ids[j] == chip_id) {
 382             driver = strdup(driver_map[i].driver);
 383             goto out;
 384          }
 385    }
 386
 387 out:
 388    log_(driver ? _LOADER_DEBUG : _LOADER_WARNING,
 389          "pci id for fd %d: %04x:%04x, driver %s\n",
 390          fd, vendor_id, chip_id, driver);
 391    return driver;
 392 }
 393
 394 void
 395 loader_set_logger(void (*logger)(int level, const char *fmt, ...))
 396 {
 397    log_ = logger;
 398 }
 399
 400 /* XXX: Local definition to avoid pulling the heavyweight GL/gl.h and
 401  * GL/internal/dri_interface.h
 402  */
 403
 404 #ifndef __DRI_DRIVER_GET_EXTENSIONS
 405 #define __DRI_DRIVER_GET_EXTENSIONS "__driDriverGetExtensions"
 406 #endif
 407
 408 char *
 409 loader_get_extensions_name(const char *driver_name)
 410 {
 411    char *name = NULL;
 412
 413    if (asprintf(&name, "%s_%s", __DRI_DRIVER_GET_EXTENSIONS, driver_name) < 0)
 414       return NULL;
 415
 416    const size_t len = strlen(name);
 417    for (size_t i = 0; i < len; i++) {
 418       if (name[i] == '-')
 419          name[i] = '_';
 420    }
 421
 422    return name;
 423 }