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 <errno.h>
  68 #include <fcntl.h>
  69 #include <sys/stat.h>
  70 #include <stdarg.h>
  71 #include <stdio.h>
  72 #include <string.h>
  73 #ifdef HAVE_LIBUDEV
  74 #include <assert.h>
  75 #include <dlfcn.h>
  76 #include <unistd.h>
  77 #include <stdlib.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 int
 108 loader_open_device(const char *device_name)
 109 {
 110    int fd;
 111 #ifdef O_CLOEXEC
 112    fd = open(device_name, O_RDWR | O_CLOEXEC);
 113    if (fd == -1 && errno == EINVAL)
 114 #endif
 115    {
 116       fd = open(device_name, O_RDWR);
 117       if (fd != -1)
 118          fcntl(fd, F_SETFD, fcntl(fd, F_GETFD) | FD_CLOEXEC);
 119    }
 120    return fd;
 121 }
 122
 123 #ifdef HAVE_LIBUDEV
 124 #include <libudev.h>
 125
 126 static void *udev_handle = NULL;
 127
 128 static void *
 129 udev_dlopen_handle(void)
 130 {
 131    char name[80];
 132    unsigned flags = RTLD_NOLOAD | RTLD_LOCAL | RTLD_LAZY;
 133    int version;
 134
 135    /* libudev.so.1 changed the return types of the two unref functions
 136     * from voids to pointers.  We don't use those return values, and the
 137     * only ABI I've heard that cares about this kind of change (calling
 138     * a function with a void * return that actually only returns void)
 139     * might be ia64.
 140     */
 141
 142    /* First try opening an already linked libudev, then try loading one */
 143    do {
 144       for (version = 1; version >= 0; version--) {
 145          snprintf(name, sizeof(name), "libudev.so.%d", version);
 146          udev_handle = dlopen(name, flags);
 147          if (udev_handle)
 148             return udev_handle;
 149       }
 150
 151       if ((flags & RTLD_NOLOAD) == 0)
 152          break;
 153
 154       flags &= ~RTLD_NOLOAD;
 155    } while (1);
 156
 157    log_(_LOADER_WARNING,
 158         "Couldn't dlopen libudev.so.1 or "
 159         "libudev.so.0, driver detection may be broken.\n");
 160    return NULL;
 161 }
 162
 163 static int dlsym_failed = 0;
 164
 165 static void *
 166 checked_dlsym(void *dlopen_handle, const char *name)
 167 {
 168    void *result = dlsym(dlopen_handle, name);
 169    if (!result)
 170       dlsym_failed = 1;
 171    return result;
 172 }
 173
 174 #define UDEV_SYMBOL(ret, name, args) \
 175    ret (*name) args = checked_dlsym(udev_dlopen_handle(), #name);
 176
 177
 178 static inline struct udev_device *
 179 udev_device_new_from_fd(struct udev *udev, int fd)
 180 {
 181    struct udev_device *device;
 182    struct stat buf;
 183    UDEV_SYMBOL(struct udev_device *, udev_device_new_from_devnum,
 184                (struct udev *udev, char type, dev_t devnum));
 185
 186    if (dlsym_failed)
 187       return NULL;
 188
 189    if (fstat(fd, &buf) < 0) {
 190       log_(_LOADER_WARNING, "MESA-LOADER: failed to stat fd %d\n", fd);
 191       return NULL;
 192    }
 193
 194    device = udev_device_new_from_devnum(udev, 'c', buf.st_rdev);
 195    if (device == NULL) {
 196       log_(_LOADER_WARNING,
 197               "MESA-LOADER: could not create udev device for fd %d\n", fd);
 198       return NULL;
 199    }
 200
 201    return device;
 202 }
 203
 204 static int
 205 libudev_get_pci_id_for_fd(int fd, int *vendor_id, int *chip_id)
 206 {
 207    struct udev *udev = NULL;
 208    struct udev_device *device = NULL, *parent;
 209    const char *pci_id;
 210    UDEV_SYMBOL(struct udev *, udev_new, (void));
 211    UDEV_SYMBOL(struct udev_device *, udev_device_get_parent,
 212                (struct udev_device *));
 213    UDEV_SYMBOL(const char *, udev_device_get_property_value,
 214                (struct udev_device *, const char *));
 215    UDEV_SYMBOL(struct udev_device *, udev_device_unref,
 216                (struct udev_device *));
 217    UDEV_SYMBOL(struct udev *, udev_unref, (struct udev *));
 218
 219    *chip_id = -1;
 220
 221    if (dlsym_failed)
 222       return 0;
 223
 224    udev = udev_new();
 225    device = udev_device_new_from_fd(udev, fd);
 226    if (!device)
 227       goto out;
 228
 229    parent = udev_device_get_parent(device);
 230    if (parent == NULL) {
 231       log_(_LOADER_WARNING, "MESA-LOADER: could not get parent device\n");
 232       goto out;
 233    }
 234
 235    pci_id = udev_device_get_property_value(parent, "PCI_ID");
 236    if (pci_id == NULL) {
 237       log_(_LOADER_INFO, "MESA-LOADER: no PCI ID\n");
 238       *chip_id = -1;
 239       goto out;
 240    } else if (sscanf(pci_id, "%x:%x", vendor_id, chip_id) != 2) {
 241       log_(_LOADER_WARNING, "MESA-LOADER: malformed PCI ID\n");
 242       *chip_id = -1;
 243       goto out;
 244    }
 245
 246 out:
 247    if (device)
 248       udev_device_unref(device);
 249    if (udev)
 250       udev_unref(udev);
 251
 252    return (*chip_id >= 0);
 253 }
 254
 255 static char *
 256 get_render_node_from_id_path_tag(struct udev *udev,
 257                                  char *id_path_tag,
 258                                  char another_tag)
 259 {
 260    struct udev_device *device;
 261    struct udev_enumerate *e;
 262    struct udev_list_entry *entry;
 263    const char *path, *id_path_tag_tmp;
 264    char *path_res;
 265    char found = 0;
 266    UDEV_SYMBOL(struct udev_enumerate *, udev_enumerate_new,
 267                (struct udev *));
 268    UDEV_SYMBOL(int, udev_enumerate_add_match_subsystem,
 269                (struct udev_enumerate *, const char *));
 270    UDEV_SYMBOL(int, udev_enumerate_add_match_sysname,
 271                (struct udev_enumerate *, const char *));
 272    UDEV_SYMBOL(int, udev_enumerate_scan_devices,
 273                (struct udev_enumerate *));
 274    UDEV_SYMBOL(struct udev_list_entry *, udev_enumerate_get_list_entry,
 275                (struct udev_enumerate *));
 276    UDEV_SYMBOL(struct udev_list_entry *, udev_list_entry_get_next,
 277                (struct udev_list_entry *));
 278    UDEV_SYMBOL(const char *, udev_list_entry_get_name,
 279                (struct udev_list_entry *));
 280    UDEV_SYMBOL(struct udev_device *, udev_device_new_from_syspath,
 281                (struct udev *, const char *));
 282    UDEV_SYMBOL(const char *, udev_device_get_property_value,
 283                (struct udev_device *, const char *));
 284    UDEV_SYMBOL(const char *, udev_device_get_devnode,
 285                (struct udev_device *));
 286    UDEV_SYMBOL(struct udev_device *, udev_device_unref,
 287                (struct udev_device *));
 288
 289    e = udev_enumerate_new(udev);
 290    udev_enumerate_add_match_subsystem(e, "drm");
 291    udev_enumerate_add_match_sysname(e, "render*");
 292
 293    udev_enumerate_scan_devices(e);
 294    udev_list_entry_foreach(entry, udev_enumerate_get_list_entry(e)) {
 295       path = udev_list_entry_get_name(entry);
 296       device = udev_device_new_from_syspath(udev, path);
 297       if (!device)
 298          continue;
 299       id_path_tag_tmp = udev_device_get_property_value(device, "ID_PATH_TAG");
 300       if (id_path_tag_tmp) {
 301          if ((!another_tag && !strcmp(id_path_tag, id_path_tag_tmp)) ||
 302              (another_tag && strcmp(id_path_tag, id_path_tag_tmp))) {
 303             found = 1;
 304             break;
 305          }
 306       }
 307       udev_device_unref(device);
 308    }
 309
 310    if (found) {
 311       path_res = strdup(udev_device_get_devnode(device));
 312       udev_device_unref(device);
 313       return path_res;
 314    }
 315    return NULL;
 316 }
 317
 318 static char *
 319 get_id_path_tag_from_fd(struct udev *udev, int fd)
 320 {
 321    struct udev_device *device;
 322    const char *id_path_tag_tmp;
 323    char *id_path_tag;
 324    UDEV_SYMBOL(const char *, udev_device_get_property_value,
 325                (struct udev_device *, const char *));
 326    UDEV_SYMBOL(struct udev_device *, udev_device_unref,
 327                (struct udev_device *));
 328
 329    device = udev_device_new_from_fd(udev, fd);
 330    if (!device)
 331       return NULL;
 332
 333    id_path_tag_tmp = udev_device_get_property_value(device, "ID_PATH_TAG");
 334    if (!id_path_tag_tmp)
 335       return NULL;
 336
 337    id_path_tag = strdup(id_path_tag_tmp);
 338
 339    udev_device_unref(device);
 340    return id_path_tag;
 341 }
 342
 343 #ifdef USE_DRICONF
 344 const char __driConfigOptionsLoader[] =
 345 DRI_CONF_BEGIN
 346     DRI_CONF_SECTION_INITIALIZATION
 347         DRI_CONF_DEVICE_ID_PATH_TAG()
 348     DRI_CONF_SECTION_END
 349 DRI_CONF_END;
 350 #endif
 351
 352 int loader_get_user_preferred_fd(int default_fd, int *different_device)
 353 {
 354    struct udev *udev;
 355 #ifdef USE_DRICONF
 356    driOptionCache defaultInitOptions;
 357    driOptionCache userInitOptions;
 358 #endif
 359    const char *dri_prime = getenv("DRI_PRIME");
 360    char *prime = NULL;
 361    int is_different_device = 0, fd = default_fd;
 362    char *default_device_id_path_tag;
 363    char *device_name = NULL;
 364    char another_tag = 0;
 365    UDEV_SYMBOL(struct udev *, udev_new, (void));
 366    UDEV_SYMBOL(struct udev *, udev_unref, (struct udev *));
 367
 368    if (dri_prime)
 369       prime = strdup(dri_prime);
 370 #ifdef USE_DRICONF
 371    else {
 372       driParseOptionInfo(&defaultInitOptions, __driConfigOptionsLoader);
 373       driParseConfigFiles(&userInitOptions, &defaultInitOptions, 0, "loader");
 374       if (driCheckOption(&userInitOptions, "device_id", DRI_STRING))
 375          prime = strdup(driQueryOptionstr(&userInitOptions, "device_id"));
 376       driDestroyOptionCache(&userInitOptions);
 377       driDestroyOptionInfo(&defaultInitOptions);
 378    }
 379 #endif
 380
 381    if (prime == NULL) {
 382       *different_device = 0;
 383       return default_fd;
 384    }
 385
 386    udev = udev_new();
 387    if (!udev)
 388       goto prime_clean;
 389
 390    default_device_id_path_tag = get_id_path_tag_from_fd(udev, default_fd);
 391    if (!default_device_id_path_tag)
 392       goto udev_clean;
 393
 394    is_different_device = 1;
 395    /* two format are supported:
 396     * "1": choose any other card than the card used by default.
 397     * id_path_tag: (for example "pci-0000_02_00_0") choose the card
 398     * with this id_path_tag.
 399     */
 400    if (!strcmp(prime,"1")) {
 401       free(prime);
 402       prime = strdup(default_device_id_path_tag);
 403       /* request a card with a different card than the default card */
 404       another_tag = 1;
 405    } else if (!strcmp(default_device_id_path_tag, prime))
 406       /* we are to get a new fd (render-node) of the same device */
 407       is_different_device = 0;
 408
 409    device_name = get_render_node_from_id_path_tag(udev,
 410                                                   prime,
 411                                                   another_tag);
 412    if (device_name == NULL) {
 413       is_different_device = 0;
 414       goto default_device_clean;
 415    }
 416
 417    fd = loader_open_device(device_name);
 418    if (fd >= 0) {
 419       close(default_fd);
 420    } else {
 421       fd = default_fd;
 422       is_different_device = 0;
 423    }
 424    free(device_name);
 425
 426  default_device_clean:
 427    free(default_device_id_path_tag);
 428  udev_clean:
 429    udev_unref(udev);
 430  prime_clean:
 431    free(prime);
 432
 433    *different_device = is_different_device;
 434    return fd;
 435 }
 436 #else
 437 int loader_get_user_preferred_fd(int default_fd, int *different_device)
 438 {
 439    *different_device = 0;
 440    return default_fd;
 441 }
 442 #endif
 443
 444 #if defined(HAVE_SYSFS)
 445 static int
 446 dev_node_from_fd(int fd, unsigned int *maj, unsigned int *min)
 447 {
 448    struct stat buf;
 449
 450    if (fstat(fd, &buf) < 0) {
 451       log_(_LOADER_WARNING, "MESA-LOADER: failed to stat fd %d\n", fd);
 452       return -1;
 453    }
 454
 455    if (!S_ISCHR(buf.st_mode)) {
 456       log_(_LOADER_WARNING, "MESA-LOADER: fd %d not a character device\n", fd);
 457       return -1;
 458    }
 459
 460    *maj = major(buf.st_rdev);
 461    *min = minor(buf.st_rdev);
 462
 463    return 0;
 464 }
 465
 466 static int
 467 sysfs_get_pci_id_for_fd(int fd, int *vendor_id, int *chip_id)
 468 {
 469    unsigned int maj, min;
 470    FILE *f;
 471    char buf[0x40];
 472
 473    if (dev_node_from_fd(fd, &maj, &min) < 0) {
 474       *chip_id = -1;
 475       return 0;
 476    }
 477
 478    snprintf(buf, sizeof(buf), "/sys/dev/char/%d:%d/device/vendor", maj, min);
 479    if (!(f = fopen(buf, "r"))) {
 480       *chip_id = -1;
 481       return 0;
 482    }
 483    if (fscanf(f, "%x", vendor_id) != 1) {
 484       *chip_id = -1;
 485       fclose(f);
 486       return 0;
 487    }
 488    fclose(f);
 489    snprintf(buf, sizeof(buf), "/sys/dev/char/%d:%d/device/device", maj, min);
 490    if (!(f = fopen(buf, "r"))) {
 491       *chip_id = -1;
 492       return 0;
 493    }
 494    if (fscanf(f, "%x", chip_id) != 1) {
 495       *chip_id = -1;
 496       fclose(f);
 497       return 0;
 498    }
 499    fclose(f);
 500    return 1;
 501 }
 502 #endif
 503
 504 #if !defined(__NOT_HAVE_DRM_H)
 505 /* for i915 */
 506 #include <i915_drm.h>
 507 /* for radeon */
 508 #include <radeon_drm.h>
 509
 510 static int
 511 drm_get_pci_id_for_fd(int fd, int *vendor_id, int *chip_id)
 512 {
 513    drmVersionPtr version;
 514
 515    *chip_id = -1;
 516
 517    version = drmGetVersion(fd);
 518    if (!version) {
 519       log_(_LOADER_WARNING, "MESA-LOADER: invalid drm fd\n");
 520       return 0;
 521    }
 522    if (!version->name) {
 523       log_(_LOADER_WARNING, "MESA-LOADER: unable to determine the driver name\n");
 524       drmFreeVersion(version);
 525       return 0;
 526    }
 527
 528    if (strcmp(version->name, "i915") == 0) {
 529       struct drm_i915_getparam gp;
 530       int ret;
 531
 532       *vendor_id = 0x8086;
 533
 534       memset(&gp, 0, sizeof(gp));
 535       gp.param = I915_PARAM_CHIPSET_ID;
 536       gp.value = chip_id;
 537       ret = drmCommandWriteRead(fd, DRM_I915_GETPARAM, &gp, sizeof(gp));
 538       if (ret) {
 539          log_(_LOADER_WARNING, "MESA-LOADER: failed to get param for i915\n");
 540          *chip_id = -1;
 541       }
 542    }
 543    else if (strcmp(version->name, "radeon") == 0) {
 544       struct drm_radeon_info info;
 545       int ret;
 546
 547       *vendor_id = 0x1002;
 548
 549       memset(&info, 0, sizeof(info));
 550       info.request = RADEON_INFO_DEVICE_ID;
 551       info.value = (unsigned long) chip_id;
 552       ret = drmCommandWriteRead(fd, DRM_RADEON_INFO, &info, sizeof(info));
 553       if (ret) {
 554          log_(_LOADER_WARNING, "MESA-LOADER: failed to get info for radeon\n");
 555          *chip_id = -1;
 556       }
 557    }
 558    else if (strcmp(version->name, "nouveau") == 0) {
 559       *vendor_id = 0x10de;
 560       /* not used */
 561       *chip_id = 0;
 562    }
 563    else if (strcmp(version->name, "vmwgfx") == 0) {
 564       *vendor_id = 0x15ad;
 565       /* assume SVGA II */
 566       *chip_id = 0x0405;
 567    }
 568
 569    drmFreeVersion(version);
 570
 571    return (*chip_id >= 0);
 572 }
 573 #endif
 574
 575
 576 int
 577 loader_get_pci_id_for_fd(int fd, int *vendor_id, int *chip_id)
 578 {
 579 #if HAVE_LIBUDEV
 580    if (libudev_get_pci_id_for_fd(fd, vendor_id, chip_id))
 581       return 1;
 582 #endif
 583 #if HAVE_SYSFS
 584    if (sysfs_get_pci_id_for_fd(fd, vendor_id, chip_id))
 585       return 1;
 586 #endif
 587 #if !defined(__NOT_HAVE_DRM_H)
 588    if (drm_get_pci_id_for_fd(fd, vendor_id, chip_id))
 589       return 1;
 590 #endif
 591    return 0;
 592 }
 593
 594
 595 #ifdef HAVE_LIBUDEV
 596 static char *
 597 libudev_get_device_name_for_fd(int fd)
 598 {
 599    char *device_name = NULL;
 600    struct udev *udev;
 601    struct udev_device *device;
 602    const char *const_device_name;
 603    UDEV_SYMBOL(struct udev *, udev_new, (void));
 604    UDEV_SYMBOL(const char *, udev_device_get_devnode,
 605                (struct udev_device *));
 606    UDEV_SYMBOL(struct udev_device *, udev_device_unref,
 607                (struct udev_device *));
 608    UDEV_SYMBOL(struct udev *, udev_unref, (struct udev *));
 609
 610    if (dlsym_failed)
 611       return NULL;
 612
 613    udev = udev_new();
 614    device = udev_device_new_from_fd(udev, fd);
 615    if (device == NULL)
 616       return NULL;
 617
 618    const_device_name = udev_device_get_devnode(device);
 619    if (!const_device_name)
 620       goto out;
 621    device_name = strdup(const_device_name);
 622
 623 out:
 624    udev_device_unref(device);
 625    udev_unref(udev);
 626    return device_name;
 627 }
 628 #endif
 629
 630
 631 #if HAVE_SYSFS
 632 static char *
 633 sysfs_get_device_name_for_fd(int fd)
 634 {
 635    char *device_name = NULL;
 636    unsigned int maj, min;
 637    FILE *f;
 638    char buf[0x40];
 639    static const char match[9] = "\0DEVNAME=";
 640    int expected = 1;
 641
 642    if (dev_node_from_fd(fd, &maj, &min) < 0)
 643       return NULL;
 644
 645    snprintf(buf, sizeof(buf), "/sys/dev/char/%d:%d/uevent", maj, min);
 646    if (!(f = fopen(buf, "r")))
 647        return NULL;
 648
 649    while (expected < sizeof(match)) {
 650       int c = getc(f);
 651
 652       if (c == EOF) {
 653          fclose(f);
 654          return NULL;
 655       } else if (c == match[expected] )
 656          expected++;
 657       else
 658          expected = 0;
 659    }
 660
 661    strcpy(buf, "/dev/");
 662    if (fgets(buf + 5, sizeof(buf) - 5, f))
 663       device_name = strdup(buf);
 664
 665    fclose(f);
 666    return device_name;
 667 }
 668 #endif
 669
 670
 671 char *
 672 loader_get_device_name_for_fd(int fd)
 673 {
 674    char *result = NULL;
 675
 676 #if HAVE_LIBUDEV
 677    if ((result = libudev_get_device_name_for_fd(fd)))
 678       return result;
 679 #endif
 680 #if HAVE_SYSFS
 681    if ((result = sysfs_get_device_name_for_fd(fd)))
 682       return result;
 683 #endif
 684    return result;
 685 }
 686
 687 char *
 688 loader_get_driver_for_fd(int fd, unsigned driver_types)
 689 {
 690    int vendor_id, chip_id, i, j;
 691    char *driver = NULL;
 692
 693    if (!driver_types)
 694       driver_types = _LOADER_GALLIUM | _LOADER_DRI;
 695
 696    if (!loader_get_pci_id_for_fd(fd, &vendor_id, &chip_id)) {
 697
 698 #ifndef __NOT_HAVE_DRM_H
 699       /* fallback to drmGetVersion(): */
 700       drmVersionPtr version = drmGetVersion(fd);
 701
 702       if (!version) {
 703          log_(_LOADER_WARNING, "failed to get driver name for fd %d\n", fd);
 704          return NULL;
 705       }
 706
 707       driver = strndup(version->name, version->name_len);
 708       log_(_LOADER_INFO, "using driver %s for %d\n", driver, fd);
 709
 710       drmFreeVersion(version);
 711 #endif
 712
 713       return driver;
 714    }
 715
 716    for (i = 0; driver_map[i].driver; i++) {
 717       if (vendor_id != driver_map[i].vendor_id)
 718          continue;
 719
 720       if (!(driver_types & driver_map[i].driver_types))
 721          continue;
 722
 723       if (driver_map[i].predicate && !driver_map[i].predicate(fd))
 724          continue;
 725
 726       if (driver_map[i].num_chips_ids == -1) {
 727          driver = strdup(driver_map[i].driver);
 728          goto out;
 729       }
 730
 731       for (j = 0; j < driver_map[i].num_chips_ids; j++)
 732          if (driver_map[i].chip_ids[j] == chip_id) {
 733             driver = strdup(driver_map[i].driver);
 734             goto out;
 735          }
 736    }
 737
 738 out:
 739    log_(driver ? _LOADER_DEBUG : _LOADER_WARNING,
 740          "pci id for fd %d: %04x:%04x, driver %s\n",
 741          fd, vendor_id, chip_id, driver);
 742    return driver;
 743 }
 744
 745 void
 746 loader_set_logger(void (*logger)(int level, const char *fmt, ...))
 747 {
 748    log_ = logger;
 749 }