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