drivers/staging/greybus/tools/loopback_test.c

   1 /*
   2  * Loopback test application
   3  *
   4  * Copyright 2015 Google Inc.
   5  * Copyright 2015 Linaro Ltd.
   6  *
   7  * Provided under the three clause BSD license found in the LICENSE file.
   8  */
   9 #include <errno.h>
  10 #include <fcntl.h>
  11 #include <stdio.h>
  12 #include <string.h>
  13 #include <stdlib.h>
  14 #include <stdint.h>
  15 #include <poll.h>
  16 #include <sys/types.h>
  17 #include <time.h>
  18 #include <unistd.h>
  19 #include <dirent.h>
  20 #include <signal.h>
  21
  22 #define MAX_NUM_DEVICES 10
  23 #define MAX_SYSFS_PATH  0x200
  24 #define CSV_MAX_LINE    0x1000
  25 #define SYSFS_MAX_INT   0x20
  26 #define MAX_STR_LEN     255
  27 #define DEFAULT_ASYNC_TIMEOUT 200000
  28
  29 struct dict {
  30         char *name;
  31         int type;
  32 };
  33
  34 static struct dict dict[] = {
  35         {"ping", 2},
  36         {"transfer", 3},
  37         {"sink", 4},
  38         {NULL,}         /* list termination */
  39 };
  40
  41 struct loopback_results {
  42         float latency_avg;
  43         uint32_t latency_max;
  44         uint32_t latency_min;
  45         uint32_t latency_jitter;
  46
  47         float request_avg;
  48         uint32_t request_max;
  49         uint32_t request_min;
  50         uint32_t request_jitter;
  51
  52         float throughput_avg;
  53         uint32_t throughput_max;
  54         uint32_t throughput_min;
  55         uint32_t throughput_jitter;
  56
  57         float apbridge_unipro_latency_avg;
  58         uint32_t apbridge_unipro_latency_max;
  59         uint32_t apbridge_unipro_latency_min;
  60         uint32_t apbridge_unipro_latency_jitter;
  61
  62         float gbphy_firmware_latency_avg;
  63         uint32_t gbphy_firmware_latency_max;
  64         uint32_t gbphy_firmware_latency_min;
  65         uint32_t gbphy_firmware_latency_jitter;
  66
  67         uint32_t error;
  68 };
  69
  70 struct loopback_device {
  71         char name[MAX_SYSFS_PATH];
  72         char sysfs_entry[MAX_SYSFS_PATH];
  73         char debugfs_entry[MAX_SYSFS_PATH];
  74         struct loopback_results results;
  75 };
  76
  77 struct loopback_test {
  78         int verbose;
  79         int debug;
  80         int raw_data_dump;
  81         int porcelain;
  82         int mask;
  83         int size;
  84         int iteration_max;
  85         int aggregate_output;
  86         int test_id;
  87         int device_count;
  88         int list_devices;
  89         int use_async;
  90         int async_timeout;
  91         int async_outstanding_operations;
  92         int us_wait;
  93         int file_output;
  94         int stop_all;
  95         int poll_count;
  96         char test_name[MAX_STR_LEN];
  97         char sysfs_prefix[MAX_SYSFS_PATH];
  98         char debugfs_prefix[MAX_SYSFS_PATH];
  99         struct timespec poll_timeout;
 100         struct loopback_device devices[MAX_NUM_DEVICES];
 101         struct loopback_results aggregate_results;
 102         struct pollfd fds[MAX_NUM_DEVICES];
 103 };
 104
 105 struct loopback_test t;
 106
 107 /* Helper macros to calculate the aggregate results for all devices */
 108 static inline int device_enabled(struct loopback_test *t, int dev_idx);
 109
 110 #define GET_MAX(field)                                                  \
 111 static int get_##field##_aggregate(struct loopback_test *t)             \
 112 {                                                                       \
 113         uint32_t max = 0;                                               \
 114         int i;                                                          \
 115         for (i = 0; i < t->device_count; i++) {                         \
 116                 if (!device_enabled(t, i))                              \
 117                         continue;                                       \
 118                 if (t->devices[i].results.field > max)                  \
 119                         max = t->devices[i].results.field;              \
 120         }                                                               \
 121         return max;                                                     \
 122 }                                                                       \
 123
 124 #define GET_MIN(field)                                                  \
 125 static int get_##field##_aggregate(struct loopback_test *t)             \
 126 {                                                                       \
 127         uint32_t min = ~0;                                              \
 128         int i;                                                          \
 129         for (i = 0; i < t->device_count; i++) {                         \
 130                 if (!device_enabled(t, i))                              \
 131                         continue;                                       \
 132                 if (t->devices[i].results.field < min)                  \
 133                         min = t->devices[i].results.field;              \
 134         }                                                               \
 135         return min;                                                     \
 136 }                                                                       \
 137
 138 #define GET_AVG(field)                                                  \
 139 static int get_##field##_aggregate(struct loopback_test *t)             \
 140 {                                                                       \
 141         uint32_t val = 0;                                               \
 142         uint32_t count = 0;                                             \
 143         int i;                                                          \
 144         for (i = 0; i < t->device_count; i++) {                         \
 145                 if (!device_enabled(t, i))                              \
 146                         continue;                                       \
 147                 count++;                                                \
 148                 val += t->devices[i].results.field;                     \
 149         }                                                               \
 150         if (count)                                                      \
 151                 val /= count;                                           \
 152         return val;                                                     \
 153 }                                                                       \
 154
 155 GET_MAX(throughput_max);
 156 GET_MAX(request_max);
 157 GET_MAX(latency_max);
 158 GET_MAX(apbridge_unipro_latency_max);
 159 GET_MAX(gbphy_firmware_latency_max);
 160 GET_MIN(throughput_min);
 161 GET_MIN(request_min);
 162 GET_MIN(latency_min);
 163 GET_MIN(apbridge_unipro_latency_min);
 164 GET_MIN(gbphy_firmware_latency_min);
 165 GET_AVG(throughput_avg);
 166 GET_AVG(request_avg);
 167 GET_AVG(latency_avg);
 168 GET_AVG(apbridge_unipro_latency_avg);
 169 GET_AVG(gbphy_firmware_latency_avg);
 170
 171 void abort(void)
 172 {
 173         _exit(1);
 174 }
 175
 176 void usage(void)
 177 {
 178         fprintf(stderr, "Usage: loopback_test TEST [SIZE] ITERATIONS [SYSPATH] [DBGPATH]\n\n"
 179         "  Run TEST for a number of ITERATIONS with operation data SIZE bytes\n"
 180         "  TEST may be \'ping\' \'transfer\' or \'sink\'\n"
 181         "  SIZE indicates the size of transfer <= greybus max payload bytes\n"
 182         "  ITERATIONS indicates the number of times to execute TEST at SIZE bytes\n"
 183         "             Note if ITERATIONS is set to zero then this utility will\n"
 184         "             initiate an infinite (non terminating) test and exit\n"
 185         "             without logging any metrics data\n"
 186         "  SYSPATH indicates the sysfs path for the loopback greybus entries e.g.\n"
 187         "          /sys/bus/greybus/devices\n"
 188         "  DBGPATH indicates the debugfs path for the loopback greybus entries e.g.\n"
 189         "          /sys/kernel/debug/gb_loopback/\n"
 190         " Mandatory arguments\n"
 191         "   -t     must be one of the test names - sink, transfer or ping\n"
 192         "   -i     iteration count - the number of iterations to run the test over\n"
 193         " Optional arguments\n"
 194         "   -S     sysfs location - location for greybus 'endo' entires default /sys/bus/greybus/devices/\n"
 195         "   -D     debugfs location - location for loopback debugfs entries default /sys/kernel/debug/gb_loopback/\n"
 196         "   -s     size of data packet to send during test - defaults to zero\n"
 197         "   -m     mask - a bit mask of connections to include example: -m 8 = 4th connection -m 9 = 1st and 4th connection etc\n"
 198         "                 default is zero which means broadcast to all connections\n"
 199         "   -v     verbose output\n"
 200         "   -d     debug output\n"
 201         "   -r     raw data output - when specified the full list of latency values are included in the output CSV\n"
 202         "   -p     porcelain - when specified printout is in a user-friendly non-CSV format. This option suppresses writing to CSV file\n"
 203         "   -a     aggregate - show aggregation of all enabled devices\n"
 204         "   -l     list found loopback devices and exit\n"
 205         "   -x     Async - Enable async transfers\n"
 206         "   -o     Async Timeout - Timeout in uSec for async operations\n"
 207         "   -O     Poll loop time out in seconds(max time a test is expected to last, default: 30sec)\n"
 208         "   -c     Max number of outstanding operations for async operations\n"
 209         "   -w     Wait in uSec between operations\n"
 210         "   -z     Enable output to a CSV file (incompatible with -p)\n"
 211         "   -f     When starting new loopback test, stop currently running tests on all devices\n"
 212         "Examples:\n"
 213         "  Send 10000 transfers with a packet size of 128 bytes to all active connections\n"
 214         "  loopback_test -t transfer -s 128 -i 10000 -S /sys/bus/greybus/devices/ -D /sys/kernel/debug/gb_loopback/\n"
 215         "  loopback_test -t transfer -s 128 -i 10000 -m 0\n"
 216         "  Send 10000 transfers with a packet size of 128 bytes to connection 1 and 4\n"
 217         "  loopback_test -t transfer -s 128 -i 10000 -m 9\n"
 218         "  loopback_test -t ping -s 0 128 -i -S /sys/bus/greybus/devices/ -D /sys/kernel/debug/gb_loopback/\n"
 219         "  loopback_test -t sink -s 2030 -i 32768 -S /sys/bus/greybus/devices/ -D /sys/kernel/debug/gb_loopback/\n");
 220         abort();
 221 }
 222
 223 static inline int device_enabled(struct loopback_test *t, int dev_idx)
 224 {
 225         if (!t->mask || (t->mask & (1 << dev_idx)))
 226                 return 1;
 227
 228         return 0;
 229 }
 230
 231 static void show_loopback_devices(struct loopback_test *t)
 232 {
 233         int i;
 234
 235         if (t->device_count == 0) {
 236                 printf("No loopback devices.\n");
 237                 return;
 238         }
 239
 240         for (i = 0; i < t->device_count; i++)
 241                 printf("device[%d] = %s\n", i, t->devices[i].name);
 242
 243 }
 244
 245 int open_sysfs(const char *sys_pfx, const char *node, int flags)
 246 {
 247         int fd;
 248         char path[MAX_SYSFS_PATH];
 249
 250         snprintf(path, sizeof(path), "%s%s", sys_pfx, node);
 251         fd = open(path, flags);
 252         if (fd < 0) {
 253                 fprintf(stderr, "unable to open %s\n", path);
 254                 abort();
 255         }
 256         return fd;
 257 }
 258
 259 int read_sysfs_int_fd(int fd, const char *sys_pfx, const char *node)
 260 {
 261         char buf[SYSFS_MAX_INT];
 262
 263         if (read(fd, buf, sizeof(buf)) < 0) {
 264                 fprintf(stderr, "unable to read from %s%s %s\n", sys_pfx, node,
 265                         strerror(errno));
 266                 close(fd);
 267                 abort();
 268         }
 269         return atoi(buf);
 270 }
 271
 272 float read_sysfs_float_fd(int fd, const char *sys_pfx, const char *node)
 273 {
 274         char buf[SYSFS_MAX_INT];
 275
 276         if (read(fd, buf, sizeof(buf)) < 0) {
 277
 278                 fprintf(stderr, "unable to read from %s%s %s\n", sys_pfx, node,
 279                         strerror(errno));
 280                 close(fd);
 281                 abort();
 282         }
 283         return atof(buf);
 284 }
 285
 286 int read_sysfs_int(const char *sys_pfx, const char *node)
 287 {
 288         int fd, val;
 289
 290         fd = open_sysfs(sys_pfx, node, O_RDONLY);
 291         val = read_sysfs_int_fd(fd, sys_pfx, node);
 292         close(fd);
 293         return val;
 294 }
 295
 296 float read_sysfs_float(const char *sys_pfx, const char *node)
 297 {
 298         int fd;
 299         float val;
 300
 301         fd = open_sysfs(sys_pfx, node, O_RDONLY);
 302         val = read_sysfs_float_fd(fd, sys_pfx, node);
 303         close(fd);
 304         return val;
 305 }
 306
 307 void write_sysfs_val(const char *sys_pfx, const char *node, int val)
 308 {
 309         int fd, len;
 310         char buf[SYSFS_MAX_INT];
 311
 312         fd = open_sysfs(sys_pfx, node, O_RDWR);
 313         len = snprintf(buf, sizeof(buf), "%d", val);
 314         if (write(fd, buf, len) < 0) {
 315                 fprintf(stderr, "unable to write to %s%s %s\n", sys_pfx, node,
 316                         strerror(errno));
 317                 close(fd);
 318                 abort();
 319         }
 320         close(fd);
 321 }
 322
 323 static int get_results(struct loopback_test *t)
 324 {
 325         struct loopback_device *d;
 326         struct loopback_results *r;
 327         int i;
 328
 329         for (i = 0; i < t->device_count; i++) {
 330                 if (!device_enabled(t, i))
 331                         continue;
 332
 333                 d = &t->devices[i];
 334                 r = &d->results;
 335
 336                 r->error = read_sysfs_int(d->sysfs_entry, "error");
 337                 r->request_min = read_sysfs_int(d->sysfs_entry, "requests_per_second_min");
 338                 r->request_max = read_sysfs_int(d->sysfs_entry, "requests_per_second_max");
 339                 r->request_avg = read_sysfs_float(d->sysfs_entry, "requests_per_second_avg");
 340
 341                 r->latency_min = read_sysfs_int(d->sysfs_entry, "latency_min");
 342                 r->latency_max = read_sysfs_int(d->sysfs_entry, "latency_max");
 343                 r->latency_avg = read_sysfs_float(d->sysfs_entry, "latency_avg");
 344
 345                 r->throughput_min = read_sysfs_int(d->sysfs_entry, "throughput_min");
 346                 r->throughput_max = read_sysfs_int(d->sysfs_entry, "throughput_max");
 347                 r->throughput_avg = read_sysfs_float(d->sysfs_entry, "throughput_avg");
 348
 349                 r->apbridge_unipro_latency_min =
 350                         read_sysfs_int(d->sysfs_entry, "apbridge_unipro_latency_min");
 351                 r->apbridge_unipro_latency_max =
 352                         read_sysfs_int(d->sysfs_entry, "apbridge_unipro_latency_max");
 353                 r->apbridge_unipro_latency_avg =
 354                         read_sysfs_float(d->sysfs_entry, "apbridge_unipro_latency_avg");
 355
 356                 r->gbphy_firmware_latency_min =
 357                         read_sysfs_int(d->sysfs_entry, "gbphy_firmware_latency_min");
 358                 r->gbphy_firmware_latency_max =
 359                         read_sysfs_int(d->sysfs_entry, "gbphy_firmware_latency_max");
 360                 r->gbphy_firmware_latency_avg =
 361                         read_sysfs_float(d->sysfs_entry, "gbphy_firmware_latency_avg");
 362
 363                 r->request_jitter = r->request_max - r->request_min;
 364                 r->latency_jitter = r->latency_max - r->latency_min;
 365                 r->throughput_jitter = r->throughput_max - r->throughput_min;
 366                 r->apbridge_unipro_latency_jitter =
 367                         r->apbridge_unipro_latency_max - r->apbridge_unipro_latency_min;
 368                 r->gbphy_firmware_latency_jitter =
 369                         r->gbphy_firmware_latency_max - r->gbphy_firmware_latency_min;
 370
 371         }
 372
 373         /*calculate the aggregate results of all enabled devices */
 374         if (t->aggregate_output) {
 375                 r = &t->aggregate_results;
 376
 377                 r->request_min = get_request_min_aggregate(t);
 378                 r->request_max = get_request_max_aggregate(t);
 379                 r->request_avg = get_request_avg_aggregate(t);
 380
 381                 r->latency_min = get_latency_min_aggregate(t);
 382                 r->latency_max = get_latency_max_aggregate(t);
 383                 r->latency_avg = get_latency_avg_aggregate(t);
 384
 385                 r->throughput_min = get_throughput_min_aggregate(t);
 386                 r->throughput_max = get_throughput_max_aggregate(t);
 387                 r->throughput_avg = get_throughput_avg_aggregate(t);
 388
 389                 r->apbridge_unipro_latency_min =
 390                         get_apbridge_unipro_latency_min_aggregate(t);
 391                 r->apbridge_unipro_latency_max =
 392                         get_apbridge_unipro_latency_max_aggregate(t);
 393                 r->apbridge_unipro_latency_avg =
 394                         get_apbridge_unipro_latency_avg_aggregate(t);
 395
 396                 r->gbphy_firmware_latency_min =
 397                         get_gbphy_firmware_latency_min_aggregate(t);
 398                 r->gbphy_firmware_latency_max =
 399                         get_gbphy_firmware_latency_max_aggregate(t);
 400                 r->gbphy_firmware_latency_avg =
 401                         get_gbphy_firmware_latency_avg_aggregate(t);
 402
 403                 r->request_jitter = r->request_max - r->request_min;
 404                 r->latency_jitter = r->latency_max - r->latency_min;
 405                 r->throughput_jitter = r->throughput_max - r->throughput_min;
 406                 r->apbridge_unipro_latency_jitter =
 407                         r->apbridge_unipro_latency_max - r->apbridge_unipro_latency_min;
 408                 r->gbphy_firmware_latency_jitter =
 409                         r->gbphy_firmware_latency_max - r->gbphy_firmware_latency_min;
 410
 411         }
 412
 413         return 0;
 414 }
 415
 416 void log_csv_error(int len, int err)
 417 {
 418         fprintf(stderr, "unable to write %d bytes to csv %s\n", len,
 419                 strerror(err));
 420 }
 421
 422 int format_output(struct loopback_test *t,
 423                         struct loopback_results *r,
 424                         const char *dev_name,
 425                         char *buf, int buf_len,
 426                         struct tm *tm)
 427 {
 428         int len = 0;
 429
 430         memset(buf, 0x00, buf_len);
 431         len = snprintf(buf, buf_len, "%u-%u-%u %u:%u:%u",
 432                        tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday,
 433                        tm->tm_hour, tm->tm_min, tm->tm_sec);
 434
 435         if (t->porcelain) {
 436                 len += snprintf(&buf[len], buf_len - len,
 437                         "\n test:\t\t\t%s\n path:\t\t\t%s\n size:\t\t\t%u\n iterations:\t\t%u\n errors:\t\t%u\n async:\t\t\t%s\n",
 438                         t->test_name,
 439                         dev_name,
 440                         t->size,
 441                         t->iteration_max,
 442                         r->error,
 443                         t->use_async ? "Enabled" : "Disabled");
 444
 445                 len += snprintf(&buf[len], buf_len - len,
 446                         " requests per-sec:\tmin=%u, max=%u, average=%f, jitter=%u\n",
 447                         r->request_min,
 448                         r->request_max,
 449                         r->request_avg,
 450                         r->request_jitter);
 451
 452                 len += snprintf(&buf[len], buf_len - len,
 453                         " ap-throughput B/s:\tmin=%u max=%u average=%f jitter=%u\n",
 454                         r->throughput_min,
 455                         r->throughput_max,
 456                         r->throughput_avg,
 457                         r->throughput_jitter);
 458                 len += snprintf(&buf[len], buf_len - len,
 459                         " ap-latency usec:\tmin=%u max=%u average=%f jitter=%u\n",
 460                         r->latency_min,
 461                         r->latency_max,
 462                         r->latency_avg,
 463                         r->latency_jitter);
 464                 len += snprintf(&buf[len], buf_len - len,
 465                         " apbridge-latency usec:\tmin=%u max=%u average=%f jitter=%u\n",
 466                         r->apbridge_unipro_latency_min,
 467                         r->apbridge_unipro_latency_max,
 468                         r->apbridge_unipro_latency_avg,
 469                         r->apbridge_unipro_latency_jitter);
 470
 471                 len += snprintf(&buf[len], buf_len - len,
 472                         " gbphy-latency usec:\tmin=%u max=%u average=%f jitter=%u\n",
 473                         r->gbphy_firmware_latency_min,
 474                         r->gbphy_firmware_latency_max,
 475                         r->gbphy_firmware_latency_avg,
 476                         r->gbphy_firmware_latency_jitter);
 477
 478         } else {
 479                 len += snprintf(&buf[len], buf_len - len, ",%s,%s,%u,%u,%u",
 480                         t->test_name, dev_name, t->size, t->iteration_max,
 481                         r->error);
 482
 483                 len += snprintf(&buf[len], buf_len - len, ",%u,%u,%f,%u",
 484                         r->request_min,
 485                         r->request_max,
 486                         r->request_avg,
 487                         r->request_jitter);
 488
 489                 len += snprintf(&buf[len], buf_len - len, ",%u,%u,%f,%u",
 490                         r->latency_min,
 491                         r->latency_max,
 492                         r->latency_avg,
 493                         r->latency_jitter);
 494
 495                 len += snprintf(&buf[len], buf_len - len, ",%u,%u,%f,%u",
 496                         r->throughput_min,
 497                         r->throughput_max,
 498                         r->throughput_avg,
 499                         r->throughput_jitter);
 500
 501                 len += snprintf(&buf[len], buf_len - len, ",%u,%u,%f,%u",
 502                         r->apbridge_unipro_latency_min,
 503                         r->apbridge_unipro_latency_max,
 504                         r->apbridge_unipro_latency_avg,
 505                         r->apbridge_unipro_latency_jitter);
 506
 507                 len += snprintf(&buf[len], buf_len - len, ",%u,%u,%f,%u",
 508                         r->gbphy_firmware_latency_min,
 509                         r->gbphy_firmware_latency_max,
 510                         r->gbphy_firmware_latency_avg,
 511                         r->gbphy_firmware_latency_jitter);
 512         }
 513
 514         printf("\n%s\n", buf);
 515
 516         return len;
 517 }
 518
 519 static int log_results(struct loopback_test *t)
 520 {
 521         int fd, i, len, ret;
 522         struct tm tm;
 523         time_t local_time;
 524         char file_name[MAX_SYSFS_PATH];
 525         char data[CSV_MAX_LINE];
 526
 527         local_time = time(NULL);
 528         tm = *localtime(&local_time);
 529
 530         /*
 531         * file name will test_name_size_iteration_max.csv
 532         * every time the same test with the same parameters is run we will then
 533         * append to the same CSV with datestamp - representing each test
 534         * dataset.
 535         */
 536         if (t->file_output && !t->porcelain) {
 537                 snprintf(file_name, sizeof(file_name), "%s_%d_%d.csv",
 538                         t->test_name, t->size, t->iteration_max);
 539
 540                 fd = open(file_name, O_WRONLY | O_CREAT | O_APPEND, 0644);
 541                 if (fd < 0) {
 542                         fprintf(stderr, "unable to open %s for appendation\n", file_name);
 543                         abort();
 544                 }
 545
 546         }
 547         for (i = 0; i < t->device_count; i++) {
 548                 if (!device_enabled(t, i))
 549                         continue;
 550
 551                 len = format_output(t, &t->devices[i].results,
 552                                         t->devices[i].name,
 553                                         data, sizeof(data), &tm);
 554                 if (t->file_output && !t->porcelain) {
 555                         ret = write(fd, data, len);
 556                         if (ret == -1)
 557                                 fprintf(stderr, "unable to write %d bytes to csv.\n", len);
 558                 }
 559
 560         }
 561
 562
 563         if (t->aggregate_output) {
 564                 len = format_output(t, &t->aggregate_results, "aggregate",
 565                                         data, sizeof(data), &tm);
 566                 if (t->file_output && !t->porcelain) {
 567                         ret = write(fd, data, len);
 568                         if (ret == -1)
 569                                 fprintf(stderr, "unable to write %d bytes to csv.\n", len);
 570                 }
 571         }
 572
 573         if (t->file_output && !t->porcelain)
 574                 close(fd);
 575
 576         return 0;
 577 }
 578
 579 int is_loopback_device(const char *path, const char *node)
 580 {
 581         char file[MAX_SYSFS_PATH];
 582
 583         snprintf(file, MAX_SYSFS_PATH, "%s%s/iteration_count", path, node);
 584         if (access(file, F_OK) == 0)
 585                 return 1;
 586         return 0;
 587 }
 588
 589 int find_loopback_devices(struct loopback_test *t)
 590 {
 591         struct dirent **namelist;
 592         int i, n, ret;
 593         unsigned int dev_id;
 594         struct loopback_device *d;
 595
 596         n = scandir(t->sysfs_prefix, &namelist, NULL, alphasort);
 597         if (n < 0) {
 598                 perror("scandir");
 599                 ret = -ENODEV;
 600                 goto baddir;
 601         }
 602
 603         /* Don't include '.' and '..' */
 604         if (n <= 2) {
 605                 ret = -ENOMEM;
 606                 goto done;
 607         }
 608
 609         for (i = 0; i < n; i++) {
 610                 ret = sscanf(namelist[i]->d_name, "gb_loopback%u", &dev_id);
 611                 if (ret != 1)
 612                         continue;
 613
 614                 if (!is_loopback_device(t->sysfs_prefix, namelist[i]->d_name))
 615                         continue;
 616
 617                 if (t->device_count == MAX_NUM_DEVICES) {
 618                         fprintf(stderr, "max number of devices reached!\n");
 619                         break;
 620                 }
 621
 622                 d = &t->devices[t->device_count++];
 623                 snprintf(d->name, MAX_STR_LEN, "gb_loopback%u", dev_id);
 624
 625                 snprintf(d->sysfs_entry, MAX_SYSFS_PATH, "%s%s/",
 626                         t->sysfs_prefix, d->name);
 627
 628                 snprintf(d->debugfs_entry, MAX_SYSFS_PATH, "%sraw_latency_%s",
 629                         t->debugfs_prefix, d->name);
 630
 631                 if (t->debug)
 632                         printf("add %s %s\n", d->sysfs_entry,
 633                                 d->debugfs_entry);
 634         }
 635
 636         ret = 0;
 637 done:
 638         for (i = 0; i < n; i++)
 639                 free(namelist[i]);
 640         free(namelist);
 641 baddir:
 642         return ret;
 643 }
 644
 645 static int open_poll_files(struct loopback_test *t)
 646 {
 647         struct loopback_device *dev;
 648         char buf[MAX_STR_LEN];
 649         char dummy;
 650         int fds_idx = 0;
 651         int i;
 652
 653         for (i = 0; i < t->device_count; i++) {
 654                 dev = &t->devices[i];
 655
 656                 if (!device_enabled(t, i))
 657                         continue;
 658
 659                 snprintf(buf, sizeof(buf), "%s%s", dev->sysfs_entry, "iteration_count");
 660                 t->fds[fds_idx].fd = open(buf, O_RDONLY);
 661                 if (t->fds[fds_idx].fd < 0) {
 662                         fprintf(stderr, "Error opening poll file!\n");
 663                         goto err;
 664                 }
 665                 read(t->fds[fds_idx].fd, &dummy, 1);
 666                 t->fds[fds_idx].events = POLLERR|POLLPRI;
 667                 t->fds[fds_idx].revents = 0;
 668                 fds_idx++;
 669         }
 670
 671         t->poll_count = fds_idx;
 672
 673         return 0;
 674
 675 err:
 676         for (i = 0; i < fds_idx; i++)
 677                 close(t->fds[i].fd);
 678
 679         return -1;
 680 }
 681
 682 static int close_poll_files(struct loopback_test *t)
 683 {
 684         int i;
 685         for (i = 0; i < t->poll_count; i++)
 686                 close(t->fds[i].fd);
 687
 688         return 0;
 689 }
 690 static int is_complete(struct loopback_test *t)
 691 {
 692         int iteration_count;
 693         int i;
 694
 695         for (i = 0; i < t->device_count; i++) {
 696                 if (!device_enabled(t, i))
 697                         continue;
 698
 699                 iteration_count = read_sysfs_int(t->devices[i].sysfs_entry,
 700                                                  "iteration_count");
 701
 702                 /* at least one device did not finish yet */
 703                 if (iteration_count != t->iteration_max)
 704                         return 0;
 705         }
 706
 707         return 1;
 708 }
 709
 710 static void stop_tests(struct loopback_test *t)
 711 {
 712         int i;
 713
 714         for (i = 0; i < t->device_count; i++) {
 715                 if (!device_enabled(t, i))
 716                         continue;
 717                 write_sysfs_val(t->devices[i].sysfs_entry, "type", 0);
 718         }
 719 }
 720
 721 static void handler(int sig) { /* do nothing */  }
 722
 723 static int wait_for_complete(struct loopback_test *t)
 724 {
 725         int number_of_events = 0;
 726         char dummy;
 727         int ret;
 728         int i;
 729         struct timespec *ts = NULL;
 730         struct sigaction sa;
 731         sigset_t mask_old, mask;
 732
 733         sigemptyset(&mask);
 734         sigemptyset(&mask_old);
 735         sigaddset(&mask, SIGINT);
 736         sigprocmask(SIG_BLOCK, &mask, &mask_old);
 737
 738         sa.sa_handler = handler;
 739         sa.sa_flags = 0;
 740         sigemptyset(&sa.sa_mask);
 741         if (sigaction(SIGINT, &sa, NULL) == -1) {
 742                 fprintf(stderr, "sigaction error\n");
 743                 return -1;
 744         }
 745
 746         if (t->poll_timeout.tv_sec != 0)
 747                 ts = &t->poll_timeout;
 748
 749         while (1) {
 750
 751                 ret = ppoll(t->fds, t->poll_count, ts, &mask_old);
 752                 if (ret <= 0) {
 753                         stop_tests(t);
 754                         fprintf(stderr, "Poll exit with errno %d\n", errno);
 755                         return -1;
 756                 }
 757
 758                 for (i = 0; i < t->poll_count; i++) {
 759                         if (t->fds[i].revents & POLLPRI) {
 760                                 /* Dummy read to clear the event */
 761                                 read(t->fds[i].fd, &dummy, 1);
 762                                 number_of_events++;
 763                         }
 764                 }
 765
 766                 if (number_of_events == t->poll_count)
 767                         break;
 768         }
 769
 770         if (!is_complete(t)) {
 771                 fprintf(stderr, "Iteration count did not finish!\n");
 772                 return -1;
 773         }
 774
 775         return 0;
 776 }
 777
 778 static void prepare_devices(struct loopback_test *t)
 779 {
 780         int i;
 781
 782         /* Cancel any running tests on enabled devices. If
 783          * stop_all option is given, stop test on all devices.
 784          */
 785         for (i = 0; i < t->device_count; i++)
 786                 if (t->stop_all || device_enabled(t, i))
 787                         write_sysfs_val(t->devices[i].sysfs_entry, "type", 0);
 788
 789
 790         for (i = 0; i < t->device_count; i++) {
 791                 if (!device_enabled(t, i))
 792                         continue;
 793
 794                 write_sysfs_val(t->devices[i].sysfs_entry, "us_wait",
 795                                 t->us_wait);
 796
 797                 /* Set operation size */
 798                 write_sysfs_val(t->devices[i].sysfs_entry, "size", t->size);
 799
 800                 /* Set iterations */
 801                 write_sysfs_val(t->devices[i].sysfs_entry, "iteration_max",
 802                                 t->iteration_max);
 803
 804                 if (t->use_async) {
 805                         write_sysfs_val(t->devices[i].sysfs_entry,
 806                                 "async", 1);
 807                         write_sysfs_val(t->devices[i].sysfs_entry,
 808                                 "timeout", t->async_timeout);
 809                         write_sysfs_val(t->devices[i].sysfs_entry,
 810                                 "outstanding_operations_max",
 811                                 t->async_outstanding_operations);
 812                 } else
 813                         write_sysfs_val(t->devices[i].sysfs_entry,
 814                                 "async", 0);
 815         }
 816 }
 817
 818 static int start(struct loopback_test *t)
 819 {
 820         int i;
 821
 822         /* the test starts by writing test_id to the type file. */
 823         for (i = 0; i < t->device_count; i++) {
 824                 if (!device_enabled(t, i))
 825                         continue;
 826
 827                 write_sysfs_val(t->devices[i].sysfs_entry, "type", t->test_id);
 828         }
 829
 830         return 0;
 831 }
 832
 833
 834 void loopback_run(struct loopback_test *t)
 835 {
 836         int i;
 837         int ret;
 838
 839         for (i = 0; dict[i].name != NULL; i++) {
 840                 if (strstr(dict[i].name, t->test_name))
 841                         t->test_id = dict[i].type;
 842         }
 843         if (!t->test_id) {
 844                 fprintf(stderr, "invalid test %s\n", t->test_name);
 845                 usage();
 846                 return;
 847         }
 848
 849         prepare_devices(t);
 850
 851         ret = open_poll_files(t);
 852         if (ret)
 853                 goto err;
 854
 855         start(t);
 856
 857         ret = wait_for_complete(t);
 858         close_poll_files(t);
 859         if (ret)
 860                 goto err;
 861
 862
 863         get_results(t);
 864
 865         log_results(t);
 866
 867         return;
 868
 869 err:
 870         printf("Error running test\n");
 871         return;
 872 }
 873
 874 static int sanity_check(struct loopback_test *t)
 875 {
 876         int i;
 877
 878         if (t->device_count == 0) {
 879                 fprintf(stderr, "No loopback devices found\n");
 880                 return -1;
 881         }
 882
 883         for (i = 0; i < MAX_NUM_DEVICES; i++) {
 884                 if (!device_enabled(t, i))
 885                         continue;
 886
 887                 if (t->mask && !strcmp(t->devices[i].name, "")) {
 888                         fprintf(stderr, "Bad device mask %x\n", (1 << i));
 889                         return -1;
 890                 }
 891
 892         }
 893
 894
 895         return 0;
 896 }
 897
 898 int main(int argc, char *argv[])
 899 {
 900         int o, ret;
 901         char *sysfs_prefix = "/sys/class/gb_loopback/";
 902         char *debugfs_prefix = "/sys/kernel/debug/gb_loopback/";
 903
 904         memset(&t, 0, sizeof(t));
 905
 906         while ((o = getopt(argc, argv,
 907                            "t:s:i:S:D:m:v::d::r::p::a::l::x::o:O:c:w:z::f::")) != -1) {
 908                 switch (o) {
 909                 case 't':
 910                         snprintf(t.test_name, MAX_STR_LEN, "%s", optarg);
 911                         break;
 912                 case 's':
 913                         t.size = atoi(optarg);
 914                         break;
 915                 case 'i':
 916                         t.iteration_max = atoi(optarg);
 917                         break;
 918                 case 'S':
 919                         snprintf(t.sysfs_prefix, MAX_SYSFS_PATH, "%s", optarg);
 920                         break;
 921                 case 'D':
 922                         snprintf(t.debugfs_prefix, MAX_SYSFS_PATH, "%s", optarg);
 923                         break;
 924                 case 'm':
 925                         t.mask = atol(optarg);
 926                         break;
 927                 case 'v':
 928                         t.verbose = 1;
 929                         break;
 930                 case 'd':
 931                         t.debug = 1;
 932                         break;
 933                 case 'r':
 934                         t.raw_data_dump = 1;
 935                         break;
 936                 case 'p':
 937                         t.porcelain = 1;
 938                         break;
 939                 case 'a':
 940                         t.aggregate_output = 1;
 941                         break;
 942                 case 'l':
 943                         t.list_devices = 1;
 944                         break;
 945                 case 'x':
 946                         t.use_async = 1;
 947                         break;
 948                 case 'o':
 949                         t.async_timeout = atoi(optarg);
 950                         break;
 951                 case 'O':
 952                         t.poll_timeout.tv_sec = atoi(optarg);
 953                         break;
 954                 case 'c':
 955                         t.async_outstanding_operations = atoi(optarg);
 956                         break;
 957                 case 'w':
 958                         t.us_wait = atoi(optarg);
 959                         break;
 960                 case 'z':
 961                         t.file_output = 1;
 962                         break;
 963                 case 'f':
 964                         t.stop_all = 1;
 965                         break;
 966                 default:
 967                         usage();
 968                         return -EINVAL;
 969                 }
 970         }
 971
 972         if (!strcmp(t.sysfs_prefix, ""))
 973                 snprintf(t.sysfs_prefix, MAX_SYSFS_PATH, "%s", sysfs_prefix);
 974
 975         if (!strcmp(t.debugfs_prefix, ""))
 976                 snprintf(t.debugfs_prefix, MAX_SYSFS_PATH, "%s", debugfs_prefix);
 977
 978         ret = find_loopback_devices(&t);
 979         if (ret)
 980                 return ret;
 981         ret = sanity_check(&t);
 982         if (ret)
 983                 return ret;
 984
 985         if (t.list_devices) {
 986                 show_loopback_devices(&t);
 987                 return 0;
 988         }
 989
 990         if (t.test_name[0] == '\0' || t.iteration_max == 0)
 991                 usage();
 992
 993         if (t.async_timeout == 0)
 994                 t.async_timeout = DEFAULT_ASYNC_TIMEOUT;
 995
 996         loopback_run(&t);
 997
 998         return 0;
 999 }