src/loader/loader.c

   1 /*
   2  * Copyright (C) 2013 Rob Clark <robclark@freedesktop.org>
   3  *
   4  * This code is derived from the following files.
   5  *
   6  * * src/glx/dri3_common.c
   7  * Copyright © 2013 Keith Packard
   8  *
   9  * * src/egl/drivers/dri2/common.c
  10  * * src/gbm/backends/dri/driver_name.c
  11  * Copyright © 2011 Intel Corporation
  12  *
  13  * Authors:
  14  *    Kristian Høgsberg <krh@bitplanet.net>
  15  *    Benjamin Franzke <benjaminfranzke@googlemail.com>
  16  *
  17  * * src/gallium/targets/egl-static/egl.c
  18  * Copyright (C) 2010-2011 LunarG Inc.
  19  *
  20  * Authors:
  21  *    Chia-I Wu <olv@lunarg.com>
  22  *
  23  * * src/gallium/state_trackers/egl/drm/native_drm.c
  24  * Copyright (C) 2010 Chia-I Wu <olv@0xlab.org>
  25  *
  26  * * src/egl/drivers/dri2/platform_android.c
  27  *
  28  * Copyright (C) 2010-2011 Chia-I Wu <olvaffe@gmail.com>
  29  * Copyright (C) 2010-2011 LunarG Inc.
  30  *
  31  * Based on platform_x11, which has
  32  *
  33  * Copyright © 2011 Intel Corporation
  34  *
  35  * * src/gallium/auxiliary/pipe-loader/pipe_loader_drm.c
  36  * Copyright 2011 Intel Corporation
  37  * Copyright 2012 Francisco Jerez
  38  * All Rights Reserved.
  39  *
  40  * Authors:
  41  *    Kristian Høgsberg <krh@bitplanet.net>
  42  *    Benjamin Franzke <benjaminfranzke@googlemail.com>
  43  *
  44  * Permission is hereby granted, free of charge, to any person obtaining a
  45  * copy of this software and associated documentation files (the "Software"),
  46  * to deal in the Software without restriction, including without limitation
  47  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  48  * and/or sell copies of the Software, and to permit persons to whom the
  49  * Software is furnished to do so, subject to the following conditions:
  50  *
  51  * The above copyright notice and this permission notice (including the next
  52  * paragraph) shall be included in all copies or substantial portions of the
  53  * Software.
  54  *
  55  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  56  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  57  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  58  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  59  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  60  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  61  * SOFTWARE.
  62  *
  63  * Authors:
  64  *    Rob Clark <robclark@freedesktop.org>
  65  */
  66
  67 #include <sys/stat.h>
  68 #include <stdarg.h>
  69 #include <stdio.h>
  70 #include <string.h>
  71 #ifdef HAVE_LIBUDEV
  72 #include <assert.h>
  73 #include <dlfcn.h>
  74 #include <fcntl.h>
  75 #include <unistd.h>
  76 #include <stdlib.h>
  77 #include <errno.h>
  78 #ifdef USE_DRICONF
  79 #include "xmlconfig.h"
  80 #include "xmlpool.h"
  81 #endif
  82 #endif
  83 #ifdef HAVE_SYSFS
  84 #include <sys/types.h>
  85 #endif
  86 #include "loader.h"
  87
  88 #ifndef __NOT_HAVE_DRM_H
  89 #include <xf86drm.h>
  90 #endif
  91
  92 #define __IS_LOADER
  93 #include "pci_id_driver_map.h"
  94
  95 static void default_logger(int level, const char *fmt, ...)
  96 {
  97    if (level <= _LOADER_WARNING) {
  98       va_list args;
  99       va_start(args, fmt);
 100       vfprintf(stderr, fmt, args);
 101       va_end(args);
 102    }
 103 }
 104
 105 static void (*log_)(int level, const char *fmt, ...) = default_logger;
 106
 107 #ifdef HAVE_LIBUDEV
 108 #include <libudev.h>
 109
 110 static void *udev_handle = NULL;
 111
 112 static void *
 113 udev_dlopen_handle(void)
 114 {
 115    if (!udev_handle) {
 116       udev_handle = dlopen("libudev.so.1", RTLD_LOCAL | RTLD_LAZY);
 117
 118       if (!udev_handle) {
 119          /* libudev.so.1 changed the return types of the two unref functions
 120           * from voids to pointers.  We don't use those return values, and the
 121           * only ABI I've heard that cares about this kind of change (calling
 122           * a function with a void * return that actually only returns void)
 123           * might be ia64.
 124           */
 125          udev_handle = dlopen("libudev.so.0", RTLD_LOCAL | RTLD_LAZY);
 126
 127          if (!udev_handle) {
 128             log_(_LOADER_WARNING, "Couldn't dlopen libudev.so.1 or "
 129                  "libudev.so.0, driver detection may be broken.\n");
 130          }
 131       }
 132    }
 133
 134    return udev_handle;
 135 }
 136
 137 static int dlsym_failed = 0;
 138
 139 static void *
 140 checked_dlsym(void *dlopen_handle, const char *name)
 141 {
 142    void *result = dlsym(dlopen_handle, name);
 143    if (!result)
 144       dlsym_failed = 1;
 145    return result;
 146 }
 147
 148 #define UDEV_SYMBOL(ret, name, args) \
 149    ret (*name) args = checked_dlsym(udev_dlopen_handle(), #name);
 150
 151
 152 static inline struct udev_device *
 153 udev_device_new_from_fd(struct udev *udev, int fd)
 154 {
 155    struct udev_device *device;
 156    struct stat buf;
 157    UDEV_SYMBOL(struct udev_device *, udev_device_new_from_devnum,
 158                (struct udev *udev, char type, dev_t devnum));
 159
 160    if (dlsym_failed)
 161       return NULL;
 162
 163    if (fstat(fd, &buf) < 0) {
 164       log_(_LOADER_WARNING, "MESA-LOADER: failed to stat fd %d\n", fd);
 165       return NULL;
 166    }
 167
 168    device = udev_device_new_from_devnum(udev, 'c', buf.st_rdev);
 169    if (device == NULL) {
 170       log_(_LOADER_WARNING,
 171               "MESA-LOADER: could not create udev device for fd %d\n", fd);
 172       return NULL;
 173    }
 174
 175    return device;
 176 }
 177
 178 static int
 179 libudev_get_pci_id_for_fd(int fd, int *vendor_id, int *chip_id)
 180 {
 181    struct udev *udev = NULL;
 182    struct udev_device *device = NULL, *parent;
 183    const char *pci_id;
 184    UDEV_SYMBOL(struct udev *, udev_new, (void));
 185    UDEV_SYMBOL(struct udev_device *, udev_device_get_parent,
 186                (struct udev_device *));
 187    UDEV_SYMBOL(const char *, udev_device_get_property_value,
 188                (struct udev_device *, const char *));
 189    UDEV_SYMBOL(struct udev_device *, udev_device_unref,
 190                (struct udev_device *));
 191    UDEV_SYMBOL(struct udev *, udev_unref, (struct udev *));
 192
 193    *chip_id = -1;
 194
 195    if (dlsym_failed)
 196       return 0;
 197
 198    udev = udev_new();
 199    device = udev_device_new_from_fd(udev, fd);
 200    if (!device)
 201       goto out;
 202
 203    parent = udev_device_get_parent(device);
 204    if (parent == NULL) {
 205       log_(_LOADER_WARNING, "MESA-LOADER: could not get parent device\n");
 206       goto out;
 207    }
 208
 209    pci_id = udev_device_get_property_value(parent, "PCI_ID");
 210    if (pci_id == NULL) {
 211       log_(_LOADER_INFO, "MESA-LOADER: no PCI ID\n");
 212       *chip_id = -1;
 213       goto out;
 214    } else if (sscanf(pci_id, "%x:%x", vendor_id, chip_id) != 2) {
 215       log_(_LOADER_WARNING, "MESA-LOADER: malformed PCI ID\n");
 216       *chip_id = -1;
 217       goto out;
 218    }
 219
 220 out:
 221    if (device)
 222       udev_device_unref(device);
 223    if (udev)
 224       udev_unref(udev);
 225
 226    return (*chip_id >= 0);
 227 }
 228
 229 static char *
 230 get_render_node_from_id_path_tag(struct udev *udev,
 231                                  char *id_path_tag,
 232                                  char another_tag)
 233 {
 234    struct udev_device *device;
 235    struct udev_enumerate *e;
 236    struct udev_list_entry *entry;
 237    const char *path, *id_path_tag_tmp;
 238    char *path_res;
 239    char found = 0;
 240    UDEV_SYMBOL(struct udev_enumerate *, udev_enumerate_new,
 241                (struct udev *));
 242    UDEV_SYMBOL(int, udev_enumerate_add_match_subsystem,
 243                (struct udev_enumerate *, const char *));
 244    UDEV_SYMBOL(int, udev_enumerate_add_match_sysname,
 245                (struct udev_enumerate *, const char *));
 246    UDEV_SYMBOL(int, udev_enumerate_scan_devices,
 247                (struct udev_enumerate *));
 248    UDEV_SYMBOL(struct udev_list_entry *, udev_enumerate_get_list_entry,
 249                (struct udev_enumerate *));
 250    UDEV_SYMBOL(struct udev_list_entry *, udev_list_entry_get_next,
 251                (struct udev_list_entry *));
 252    UDEV_SYMBOL(const char *, udev_list_entry_get_name,
 253                (struct udev_list_entry *));
 254    UDEV_SYMBOL(struct udev_device *, udev_device_new_from_syspath,
 255                (struct udev *, const char *));
 256    UDEV_SYMBOL(const char *, udev_device_get_property_value,
 257                (struct udev_device *, const char *));
 258    UDEV_SYMBOL(const char *, udev_device_get_devnode,
 259                (struct udev_device *));
 260    UDEV_SYMBOL(struct udev_device *, udev_device_unref,
 261                (struct udev_device *));
 262
 263    e = udev_enumerate_new(udev);
 264    udev_enumerate_add_match_subsystem(e, "drm");
 265    udev_enumerate_add_match_sysname(e, "render*");
 266
 267    udev_enumerate_scan_devices(e);
 268    udev_list_entry_foreach(entry, udev_enumerate_get_list_entry(e)) {
 269       path = udev_list_entry_get_name(entry);
 270       device = udev_device_new_from_syspath(udev, path);
 271       if (!device)
 272          continue;
 273       id_path_tag_tmp = udev_device_get_property_value(device, "ID_PATH_TAG");
 274       if (id_path_tag_tmp) {
 275          if ((!another_tag && !strcmp(id_path_tag, id_path_tag_tmp)) ||
 276              (another_tag && strcmp(id_path_tag, id_path_tag_tmp))) {
 277             found = 1;
 278             break;
 279          }
 280       }
 281       udev_device_unref(device);
 282    }
 283
 284    if (found) {
 285       path_res = strdup(udev_device_get_devnode(device));
 286       udev_device_unref(device);
 287       return path_res;
 288    }
 289    return NULL;
 290 }
 291
 292 static char *
 293 get_id_path_tag_from_fd(struct udev *udev, int fd)
 294 {
 295    struct udev_device *device;
 296    const char *id_path_tag_tmp;
 297    char *id_path_tag;
 298    UDEV_SYMBOL(const char *, udev_device_get_property_value,
 299                (struct udev_device *, const char *));
 300    UDEV_SYMBOL(struct udev_device *, udev_device_unref,
 301                (struct udev_device *));
 302
 303    device = udev_device_new_from_fd(udev, fd);
 304    if (!device)
 305       return NULL;
 306
 307    id_path_tag_tmp = udev_device_get_property_value(device, "ID_PATH_TAG");
 308    if (!id_path_tag_tmp)
 309       return NULL;
 310
 311    id_path_tag = strdup(id_path_tag_tmp);
 312
 313    udev_device_unref(device);
 314    return id_path_tag;
 315 }
 316
 317 int
 318 loader_open_device(const char *device_name)
 319 {
 320    int fd;
 321 #ifdef O_CLOEXEC
 322    fd = open(device_name, O_RDWR | O_CLOEXEC);
 323    if (fd == -1 && errno == EINVAL)
 324 #endif
 325    {
 326       fd = open(device_name, O_RDWR);
 327       if (fd != -1)
 328          fcntl(fd, F_SETFD, fcntl(fd, F_GETFD) | FD_CLOEXEC);
 329    }
 330    return fd;
 331 }
 332
 333 #ifdef USE_DRICONF
 334 const char __driConfigOptionsLoader[] =
 335 DRI_CONF_BEGIN
 336     DRI_CONF_SECTION_INITIALIZATION
 337         DRI_CONF_DEVICE_ID_PATH_TAG()
 338     DRI_CONF_SECTION_END
 339 DRI_CONF_END;
 340 #endif
 341
 342 int loader_get_user_preferred_fd(int default_fd, int *different_device)
 343 {
 344    struct udev *udev;
 345 #ifdef USE_DRICONF
 346    driOptionCache defaultInitOptions;
 347    driOptionCache userInitOptions;
 348 #endif
 349    const char *dri_prime = getenv("DRI_PRIME");
 350    char *prime = NULL;
 351    int is_different_device = 0, fd = default_fd;
 352    char *default_device_id_path_tag;
 353    char *device_name = NULL;
 354    char another_tag = 0;
 355    UDEV_SYMBOL(struct udev *, udev_new, (void));
 356    UDEV_SYMBOL(struct udev *, udev_unref, (struct udev *));
 357
 358    if (dri_prime)
 359       prime = strdup(dri_prime);
 360 #ifdef USE_DRICONF
 361    else {
 362       driParseOptionInfo(&defaultInitOptions, __driConfigOptionsLoader);
 363       driParseConfigFiles(&userInitOptions, &defaultInitOptions, 0, "loader");
 364       if (driCheckOption(&userInitOptions, "device_id", DRI_STRING))
 365          prime = strdup(driQueryOptionstr(&userInitOptions, "device_id"));
 366       driDestroyOptionCache(&userInitOptions);
 367       driDestroyOptionInfo(&defaultInitOptions);
 368    }
 369 #endif
 370
 371    if (prime == NULL) {
 372       *different_device = 0;
 373       return default_fd;
 374    }
 375
 376    udev = udev_new();
 377    if (!udev)
 378       goto prime_clean;
 379
 380    default_device_id_path_tag = get_id_path_tag_from_fd(udev, default_fd);
 381    if (!default_device_id_path_tag)
 382       goto udev_clean;
 383
 384    is_different_device = 1;
 385    /* two format are supported:
 386     * "1": choose any other card than the card used by default.
 387     * id_path_tag: (for example "pci-0000_02_00_0") choose the card
 388     * with this id_path_tag.
 389     */
 390    if (!strcmp(prime,"1")) {
 391       free(prime);
 392       prime = strdup(default_device_id_path_tag);
 393       /* request a card with a different card than the default card */
 394       another_tag = 1;
 395    } else if (!strcmp(default_device_id_path_tag, prime))
 396       /* we are to get a new fd (render-node) of the same device */
 397       is_different_device = 0;
 398
 399    device_name = get_render_node_from_id_path_tag(udev,
 400                                                   prime,
 401                                                   another_tag);
 402    if (device_name == NULL) {
 403       is_different_device = 0;
 404       goto default_device_clean;
 405    }
 406
 407    fd = loader_open_device(device_name);
 408    if (fd >= 0) {
 409       close(default_fd);
 410    } else {
 411       fd = default_fd;
 412       is_different_device = 0;
 413    }
 414    free(device_name);
 415
 416  default_device_clean:
 417    free(default_device_id_path_tag);
 418  udev_clean:
 419    udev_unref(udev);
 420  prime_clean:
 421    free(prime);
 422
 423    *different_device = is_different_device;
 424    return fd;
 425 }
 426 #else
 427 int loader_get_user_preferred_fd(int default_fd, int *different_device)
 428 {
 429    *different_device = 0;
 430    return default_fd;
 431 }
 432 #endif
 433
 434 #if defined(HAVE_SYSFS)
 435 static int
 436 dev_node_from_fd(int fd, unsigned int *maj, unsigned int *min)
 437 {
 438    struct stat buf;
 439
 440    if (fstat(fd, &buf) < 0) {
 441       log_(_LOADER_WARNING, "MESA-LOADER: failed to stat fd %d\n", fd);
 442       return -1;
 443    }
 444
 445    if (!S_ISCHR(buf.st_mode)) {
 446       log_(_LOADER_WARNING, "MESA-LOADER: fd %d not a character device\n", fd);
 447       return -1;
 448    }
 449
 450    *maj = major(buf.st_rdev);
 451    *min = minor(buf.st_rdev);
 452
 453    return 0;
 454 }
 455
 456 static int
 457 sysfs_get_pci_id_for_fd(int fd, int *vendor_id, int *chip_id)
 458 {
 459    unsigned int maj, min;
 460    FILE *f;
 461    char buf[0x40];
 462
 463    if (dev_node_from_fd(fd, &maj, &min) < 0) {
 464       *chip_id = -1;
 465       return 0;
 466    }
 467
 468    snprintf(buf, sizeof(buf), "/sys/dev/char/%d:%d/device/vendor", maj, min);
 469    if (!(f = fopen(buf, "r"))) {
 470       *chip_id = -1;
 471       return 0;
 472    }
 473    if (fscanf(f, "%x", vendor_id) != 1) {
 474       *chip_id = -1;
 475       fclose(f);
 476       return 0;
 477    }
 478    fclose(f);
 479    snprintf(buf, sizeof(buf), "/sys/dev/char/%d:%d/device/device", maj, min);
 480    if (!(f = fopen(buf, "r"))) {
 481       *chip_id = -1;
 482       return 0;
 483    }
 484    if (fscanf(f, "%x", chip_id) != 1) {
 485       *chip_id = -1;
 486       fclose(f);
 487       return 0;
 488    }
 489    fclose(f);
 490    return 1;
 491 }
 492 #endif
 493
 494 #if !defined(__NOT_HAVE_DRM_H)
 495 /* for i915 */
 496 #include <i915_drm.h>
 497 /* for radeon */
 498 #include <radeon_drm.h>
 499
 500 static int
 501 drm_get_pci_id_for_fd(int fd, int *vendor_id, int *chip_id)
 502 {
 503    drmVersionPtr version;
 504
 505    *chip_id = -1;
 506
 507    version = drmGetVersion(fd);
 508    if (!version) {
 509       log_(_LOADER_WARNING, "MESA-LOADER: invalid drm fd\n");
 510       return 0;
 511    }
 512    if (!version->name) {
 513       log_(_LOADER_WARNING, "MESA-LOADER: unable to determine the driver name\n");
 514       drmFreeVersion(version);
 515       return 0;
 516    }
 517
 518    if (strcmp(version->name, "i915") == 0) {
 519       struct drm_i915_getparam gp;
 520       int ret;
 521
 522       *vendor_id = 0x8086;
 523
 524       memset(&gp, 0, sizeof(gp));
 525       gp.param = I915_PARAM_CHIPSET_ID;
 526       gp.value = chip_id;
 527       ret = drmCommandWriteRead(fd, DRM_I915_GETPARAM, &gp, sizeof(gp));
 528       if (ret) {
 529          log_(_LOADER_WARNING, "MESA-LOADER: failed to get param for i915\n");
 530          *chip_id = -1;
 531       }
 532    }
 533    else if (strcmp(version->name, "radeon") == 0) {
 534       struct drm_radeon_info info;
 535       int ret;
 536
 537       *vendor_id = 0x1002;
 538
 539       memset(&info, 0, sizeof(info));
 540       info.request = RADEON_INFO_DEVICE_ID;
 541       info.value = (unsigned long) chip_id;
 542       ret = drmCommandWriteRead(fd, DRM_RADEON_INFO, &info, sizeof(info));
 543       if (ret) {
 544          log_(_LOADER_WARNING, "MESA-LOADER: failed to get info for radeon\n");
 545          *chip_id = -1;
 546       }
 547    }
 548    else if (strcmp(version->name, "nouveau") == 0) {
 549       *vendor_id = 0x10de;
 550       /* not used */
 551       *chip_id = 0;
 552    }
 553    else if (strcmp(version->name, "vmwgfx") == 0) {
 554       *vendor_id = 0x15ad;
 555       /* assume SVGA II */
 556       *chip_id = 0x0405;
 557    }
 558
 559    drmFreeVersion(version);
 560
 561    return (*chip_id >= 0);
 562 }
 563 #endif
 564
 565
 566 int
 567 loader_get_pci_id_for_fd(int fd, int *vendor_id, int *chip_id)
 568 {
 569 #if HAVE_LIBUDEV
 570    if (libudev_get_pci_id_for_fd(fd, vendor_id, chip_id))
 571       return 1;
 572 #endif
 573 #if HAVE_SYSFS
 574    if (sysfs_get_pci_id_for_fd(fd, vendor_id, chip_id))
 575       return 1;
 576 #endif
 577 #if !defined(__NOT_HAVE_DRM_H)
 578    if (drm_get_pci_id_for_fd(fd, vendor_id, chip_id))
 579       return 1;
 580 #endif
 581    return 0;
 582 }
 583
 584
 585 #ifdef HAVE_LIBUDEV
 586 static char *
 587 libudev_get_device_name_for_fd(int fd)
 588 {
 589    char *device_name = NULL;
 590    struct udev *udev;
 591    struct udev_device *device;
 592    const char *const_device_name;
 593    UDEV_SYMBOL(struct udev *, udev_new, (void));
 594    UDEV_SYMBOL(const char *, udev_device_get_devnode,
 595                (struct udev_device *));
 596    UDEV_SYMBOL(struct udev_device *, udev_device_unref,
 597                (struct udev_device *));
 598    UDEV_SYMBOL(struct udev *, udev_unref, (struct udev *));
 599
 600    if (dlsym_failed)
 601       return NULL;
 602
 603    udev = udev_new();
 604    device = udev_device_new_from_fd(udev, fd);
 605    if (device == NULL)
 606       return NULL;
 607
 608    const_device_name = udev_device_get_devnode(device);
 609    if (!const_device_name)
 610       goto out;
 611    device_name = strdup(const_device_name);
 612
 613 out:
 614    udev_device_unref(device);
 615    udev_unref(udev);
 616    return device_name;
 617 }
 618 #endif
 619
 620
 621 #if HAVE_SYSFS
 622 static char *
 623 sysfs_get_device_name_for_fd(int fd)
 624 {
 625    char *device_name = NULL;
 626    unsigned int maj, min;
 627    FILE *f;
 628    char buf[0x40];
 629    static const char match[9] = "\0DEVNAME=";
 630    int expected = 1;
 631
 632    if (dev_node_from_fd(fd, &maj, &min) < 0)
 633       return NULL;
 634
 635    snprintf(buf, sizeof(buf), "/sys/dev/char/%d:%d/uevent", maj, min);
 636    if (!(f = fopen(buf, "r")))
 637        return NULL;
 638
 639    while (expected < sizeof(match)) {
 640       int c = getc(f);
 641
 642       if (c == EOF) {
 643          fclose(f);
 644          return NULL;
 645       } else if (c == match[expected] )
 646          expected++;
 647       else
 648          expected = 0;
 649    }
 650
 651    strcpy(buf, "/dev/");
 652    if (fgets(buf + 5, sizeof(buf) - 5, f))
 653       device_name = strdup(buf);
 654
 655    fclose(f);
 656    return device_name;
 657 }
 658 #endif
 659
 660
 661 char *
 662 loader_get_device_name_for_fd(int fd)
 663 {
 664    char *result = NULL;
 665
 666 #if HAVE_LIBUDEV
 667    if ((result = libudev_get_device_name_for_fd(fd)))
 668       return result;
 669 #endif
 670 #if HAVE_SYSFS
 671    if ((result = sysfs_get_device_name_for_fd(fd)))
 672       return result;
 673 #endif
 674    return result;
 675 }
 676
 677 char *
 678 loader_get_driver_for_fd(int fd, unsigned driver_types)
 679 {
 680    int vendor_id, chip_id, i, j;
 681    char *driver = NULL;
 682
 683    if (!driver_types)
 684       driver_types = _LOADER_GALLIUM | _LOADER_DRI;
 685
 686    if (!loader_get_pci_id_for_fd(fd, &vendor_id, &chip_id)) {
 687
 688 #ifndef __NOT_HAVE_DRM_H
 689       /* fallback to drmGetVersion(): */
 690       drmVersionPtr version = drmGetVersion(fd);
 691
 692       if (!version) {
 693          log_(_LOADER_WARNING, "failed to get driver name for fd %d\n", fd);
 694          return NULL;
 695       }
 696
 697       driver = strndup(version->name, version->name_len);
 698       log_(_LOADER_INFO, "using driver %s for %d\n", driver, fd);
 699
 700       drmFreeVersion(version);
 701 #endif
 702
 703       return driver;
 704    }
 705
 706    for (i = 0; driver_map[i].driver; i++) {
 707       if (vendor_id != driver_map[i].vendor_id)
 708          continue;
 709
 710       if (!(driver_types & driver_map[i].driver_types))
 711          continue;
 712
 713       if (driver_map[i].predicate && !driver_map[i].predicate(fd))
 714          continue;
 715
 716       if (driver_map[i].num_chips_ids == -1) {
 717          driver = strdup(driver_map[i].driver);
 718          goto out;
 719       }
 720
 721       for (j = 0; j < driver_map[i].num_chips_ids; j++)
 722          if (driver_map[i].chip_ids[j] == chip_id) {
 723             driver = strdup(driver_map[i].driver);
 724             goto out;
 725          }
 726    }
 727
 728 out:
 729    log_(driver ? _LOADER_DEBUG : _LOADER_WARNING,
 730          "pci id for fd %d: %04x:%04x, driver %s\n",
 731          fd, vendor_id, chip_id, driver);
 732    return driver;
 733 }
 734
 735 void
 736 loader_set_logger(void (*logger)(int level, const char *fmt, ...))
 737 {
 738    log_ = logger;
 739 }