drivers/spi/spi-loopback-test.c

/* [<][>][^][v][top][bottom][index][help] */
This source file includes following definitions.
spi_loopback_test_probe
spi_test_print_hex_dump
spi_test_dump_message
rx_ranges_cmp
spi_check_rx_ranges
spi_test_check_elapsed_time
spi_test_check_loopback_result
spi_test_translate
spi_test_fill_pattern
_spi_test_run_iter
spi_test_run_iter
spi_test_execute_msg
spi_test_run_test
spi_test_run_tests
   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  linux/drivers/spi/spi-loopback-test.c
   4  *
   5  *  (c) Martin Sperl <kernel@martin.sperl.org>
   6  *
   7  *  Loopback test driver to test several typical spi_message conditions
   8  *  that a spi_master driver may encounter
   9  *  this can also get used for regression testing
  10  */
  11 
  12 #include <linux/delay.h>
  13 #include <linux/kernel.h>
  14 #include <linux/ktime.h>
  15 #include <linux/list.h>
  16 #include <linux/list_sort.h>
  17 #include <linux/module.h>
  18 #include <linux/of_device.h>
  19 #include <linux/printk.h>
  20 #include <linux/vmalloc.h>
  21 #include <linux/spi/spi.h>
  22 
  23 #include "spi-test.h"
  24 
  25 /* flag to only simulate transfers */
  26 static int simulate_only;
  27 module_param(simulate_only, int, 0);
  28 MODULE_PARM_DESC(simulate_only, "if not 0 do not execute the spi message");
  29 
  30 /* dump spi messages */
  31 static int dump_messages;
  32 module_param(dump_messages, int, 0);
  33 MODULE_PARM_DESC(dump_messages,
  34                  "=1 dump the basic spi_message_structure, " \
  35                  "=2 dump the spi_message_structure including data, " \
  36                  "=3 dump the spi_message structure before and after execution");
  37 /* the device is jumpered for loopback - enabling some rx_buf tests */
  38 static int loopback;
  39 module_param(loopback, int, 0);
  40 MODULE_PARM_DESC(loopback,
  41                  "if set enable loopback mode, where the rx_buf "       \
  42                  "is checked to match tx_buf after the spi_message "    \
  43                  "is executed");
  44 
  45 static int loop_req;
  46 module_param(loop_req, int, 0);
  47 MODULE_PARM_DESC(loop_req,
  48                  "if set controller will be asked to enable test loop mode. " \
  49                  "If controller supported it, MISO and MOSI will be connected");
  50 
  51 static int no_cs;
  52 module_param(no_cs, int, 0);
  53 MODULE_PARM_DESC(no_cs,
  54                  "if set Chip Select (CS) will not be used");
  55 
  56 /* run only a specific test */
  57 static int run_only_test = -1;
  58 module_param(run_only_test, int, 0);
  59 MODULE_PARM_DESC(run_only_test,
  60                  "only run the test with this number (0-based !)");
  61 
  62 /* use vmalloc'ed buffers */
  63 static int use_vmalloc;
  64 module_param(use_vmalloc, int, 0644);
  65 MODULE_PARM_DESC(use_vmalloc,
  66                  "use vmalloc'ed buffers instead of kmalloc'ed");
  67 
  68 /* check rx ranges */
  69 static int check_ranges = 1;
  70 module_param(check_ranges, int, 0644);
  71 MODULE_PARM_DESC(check_ranges,
  72                  "checks rx_buffer pattern are valid");
  73 
  74 /* the actual tests to execute */
  75 static struct spi_test spi_tests[] = {
  76         {
  77                 .description    = "tx/rx-transfer - start of page",
  78                 .fill_option    = FILL_COUNT_8,
  79                 .iterate_len    = { ITERATE_MAX_LEN },
  80                 .iterate_tx_align = ITERATE_ALIGN,
  81                 .iterate_rx_align = ITERATE_ALIGN,
  82                 .transfer_count = 1,
  83                 .transfers              = {
  84                         {
  85                                 .tx_buf = TX(0),
  86                                 .rx_buf = RX(0),
  87                         },
  88                 },
  89         },
  90         {
  91                 .description    = "tx/rx-transfer - crossing PAGE_SIZE",
  92                 .fill_option    = FILL_COUNT_8,
  93                 .iterate_len    = { ITERATE_MAX_LEN },
  94                 .iterate_tx_align = ITERATE_ALIGN,
  95                 .iterate_rx_align = ITERATE_ALIGN,
  96                 .transfer_count = 1,
  97                 .transfers              = {
  98                         {
  99                                 .tx_buf = TX(PAGE_SIZE - 4),
 100                                 .rx_buf = RX(PAGE_SIZE - 4),
 101                         },
 102                 },
 103         },
 104         {
 105                 .description    = "tx-transfer - only",
 106                 .fill_option    = FILL_COUNT_8,
 107                 .iterate_len    = { ITERATE_MAX_LEN },
 108                 .iterate_tx_align = ITERATE_ALIGN,
 109                 .transfer_count = 1,
 110                 .transfers              = {
 111                         {
 112                                 .tx_buf = TX(0),
 113                         },
 114                 },
 115         },
 116         {
 117                 .description    = "rx-transfer - only",
 118                 .fill_option    = FILL_COUNT_8,
 119                 .iterate_len    = { ITERATE_MAX_LEN },
 120                 .iterate_rx_align = ITERATE_ALIGN,
 121                 .transfer_count = 1,
 122                 .transfers              = {
 123                         {
 124                                 .rx_buf = RX(0),
 125                         },
 126                 },
 127         },
 128         {
 129                 .description    = "two tx-transfers - alter both",
 130                 .fill_option    = FILL_COUNT_8,
 131                 .iterate_len    = { ITERATE_LEN },
 132                 .iterate_tx_align = ITERATE_ALIGN,
 133                 .iterate_transfer_mask = BIT(0) | BIT(1),
 134                 .transfer_count = 2,
 135                 .transfers              = {
 136                         {
 137                                 .tx_buf = TX(0),
 138                         },
 139                         {
 140                                 /* this is why we cant use ITERATE_MAX_LEN */
 141                                 .tx_buf = TX(SPI_TEST_MAX_SIZE_HALF),
 142                         },
 143                 },
 144         },
 145         {
 146                 .description    = "two tx-transfers - alter first",
 147                 .fill_option    = FILL_COUNT_8,
 148                 .iterate_len    = { ITERATE_MAX_LEN },
 149                 .iterate_tx_align = ITERATE_ALIGN,
 150                 .iterate_transfer_mask = BIT(0),
 151                 .transfer_count = 2,
 152                 .transfers              = {
 153                         {
 154                                 .tx_buf = TX(64),
 155                         },
 156                         {
 157                                 .len = 1,
 158                                 .tx_buf = TX(0),
 159                         },
 160                 },
 161         },
 162         {
 163                 .description    = "two tx-transfers - alter second",
 164                 .fill_option    = FILL_COUNT_8,
 165                 .iterate_len    = { ITERATE_MAX_LEN },
 166                 .iterate_tx_align = ITERATE_ALIGN,
 167                 .iterate_transfer_mask = BIT(1),
 168                 .transfer_count = 2,
 169                 .transfers              = {
 170                         {
 171                                 .len = 16,
 172                                 .tx_buf = TX(0),
 173                         },
 174                         {
 175                                 .tx_buf = TX(64),
 176                         },
 177                 },
 178         },
 179         {
 180                 .description    = "two transfers tx then rx - alter both",
 181                 .fill_option    = FILL_COUNT_8,
 182                 .iterate_len    = { ITERATE_MAX_LEN },
 183                 .iterate_tx_align = ITERATE_ALIGN,
 184                 .iterate_transfer_mask = BIT(0) | BIT(1),
 185                 .transfer_count = 2,
 186                 .transfers              = {
 187                         {
 188                                 .tx_buf = TX(0),
 189                         },
 190                         {
 191                                 .rx_buf = RX(0),
 192                         },
 193                 },
 194         },
 195         {
 196                 .description    = "two transfers tx then rx - alter tx",
 197                 .fill_option    = FILL_COUNT_8,
 198                 .iterate_len    = { ITERATE_MAX_LEN },
 199                 .iterate_tx_align = ITERATE_ALIGN,
 200                 .iterate_transfer_mask = BIT(0),
 201                 .transfer_count = 2,
 202                 .transfers              = {
 203                         {
 204                                 .tx_buf = TX(0),
 205                         },
 206                         {
 207                                 .len = 1,
 208                                 .rx_buf = RX(0),
 209                         },
 210                 },
 211         },
 212         {
 213                 .description    = "two transfers tx then rx - alter rx",
 214                 .fill_option    = FILL_COUNT_8,
 215                 .iterate_len    = { ITERATE_MAX_LEN },
 216                 .iterate_tx_align = ITERATE_ALIGN,
 217                 .iterate_transfer_mask = BIT(1),
 218                 .transfer_count = 2,
 219                 .transfers              = {
 220                         {
 221                                 .len = 1,
 222                                 .tx_buf = TX(0),
 223                         },
 224                         {
 225                                 .rx_buf = RX(0),
 226                         },
 227                 },
 228         },
 229         {
 230                 .description    = "two tx+rx transfers - alter both",
 231                 .fill_option    = FILL_COUNT_8,
 232                 .iterate_len    = { ITERATE_LEN },
 233                 .iterate_tx_align = ITERATE_ALIGN,
 234                 .iterate_transfer_mask = BIT(0) | BIT(1),
 235                 .transfer_count = 2,
 236                 .transfers              = {
 237                         {
 238                                 .tx_buf = TX(0),
 239                                 .rx_buf = RX(0),
 240                         },
 241                         {
 242                                 /* making sure we align without overwrite
 243                                  * the reason we can not use ITERATE_MAX_LEN
 244                                  */
 245                                 .tx_buf = TX(SPI_TEST_MAX_SIZE_HALF),
 246                                 .rx_buf = RX(SPI_TEST_MAX_SIZE_HALF),
 247                         },
 248                 },
 249         },
 250         {
 251                 .description    = "two tx+rx transfers - alter first",
 252                 .fill_option    = FILL_COUNT_8,
 253                 .iterate_len    = { ITERATE_MAX_LEN },
 254                 .iterate_tx_align = ITERATE_ALIGN,
 255                 .iterate_transfer_mask = BIT(0),
 256                 .transfer_count = 2,
 257                 .transfers              = {
 258                         {
 259                                 /* making sure we align without overwrite */
 260                                 .tx_buf = TX(1024),
 261                                 .rx_buf = RX(1024),
 262                         },
 263                         {
 264                                 .len = 1,
 265                                 /* making sure we align without overwrite */
 266                                 .tx_buf = TX(0),
 267                                 .rx_buf = RX(0),
 268                         },
 269                 },
 270         },
 271         {
 272                 .description    = "two tx+rx transfers - alter second",
 273                 .fill_option    = FILL_COUNT_8,
 274                 .iterate_len    = { ITERATE_MAX_LEN },
 275                 .iterate_tx_align = ITERATE_ALIGN,
 276                 .iterate_transfer_mask = BIT(1),
 277                 .transfer_count = 2,
 278                 .transfers              = {
 279                         {
 280                                 .len = 1,
 281                                 .tx_buf = TX(0),
 282                                 .rx_buf = RX(0),
 283                         },
 284                         {
 285                                 /* making sure we align without overwrite */
 286                                 .tx_buf = TX(1024),
 287                                 .rx_buf = RX(1024),
 288                         },
 289                 },
 290         },
 291         {
 292                 .description    = "two tx+rx transfers - delay after transfer",
 293                 .fill_option    = FILL_COUNT_8,
 294                 .iterate_len    = { ITERATE_MAX_LEN },
 295                 .iterate_transfer_mask = BIT(0) | BIT(1),
 296                 .transfer_count = 2,
 297                 .transfers              = {
 298                         {
 299                                 .tx_buf = TX(0),
 300                                 .rx_buf = RX(0),
 301                                 .delay_usecs = 1000,
 302                         },
 303                         {
 304                                 .tx_buf = TX(0),
 305                                 .rx_buf = RX(0),
 306                                 .delay_usecs = 1000,
 307                         },
 308                 },
 309         },
 310 
 311         { /* end of tests sequence */ }
 312 };
 313 
 314 static int spi_loopback_test_probe(struct spi_device *spi)
 315 {
 316         int ret;
 317 
 318         if (loop_req || no_cs) {
 319                 spi->mode |= loop_req ? SPI_LOOP : 0;
 320                 spi->mode |= no_cs ? SPI_NO_CS : 0;
 321                 ret = spi_setup(spi);
 322                 if (ret) {
 323                         dev_err(&spi->dev, "SPI setup with SPI_LOOP or SPI_NO_CS failed (%d)\n",
 324                                 ret);
 325                         return ret;
 326                 }
 327         }
 328 
 329         dev_info(&spi->dev, "Executing spi-loopback-tests\n");
 330 
 331         ret = spi_test_run_tests(spi, spi_tests);
 332 
 333         dev_info(&spi->dev, "Finished spi-loopback-tests with return: %i\n",
 334                  ret);
 335 
 336         return ret;
 337 }
 338 
 339 /* non const match table to permit to change via a module parameter */
 340 static struct of_device_id spi_loopback_test_of_match[] = {
 341         { .compatible   = "linux,spi-loopback-test", },
 342         { }
 343 };
 344 
 345 /* allow to override the compatible string via a module_parameter */
 346 module_param_string(compatible, spi_loopback_test_of_match[0].compatible,
 347                     sizeof(spi_loopback_test_of_match[0].compatible),
 348                     0000);
 349 
 350 MODULE_DEVICE_TABLE(of, spi_loopback_test_of_match);
 351 
 352 static struct spi_driver spi_loopback_test_driver = {
 353         .driver = {
 354                 .name = "spi-loopback-test",
 355                 .owner = THIS_MODULE,
 356                 .of_match_table = spi_loopback_test_of_match,
 357         },
 358         .probe = spi_loopback_test_probe,
 359 };
 360 
 361 module_spi_driver(spi_loopback_test_driver);
 362 
 363 MODULE_AUTHOR("Martin Sperl <kernel@martin.sperl.org>");
 364 MODULE_DESCRIPTION("test spi_driver to check core functionality");
 365 MODULE_LICENSE("GPL");
 366 
 367 /*-------------------------------------------------------------------------*/
 368 
 369 /* spi_test implementation */
 370 
 371 #define RANGE_CHECK(ptr, plen, start, slen) \
 372         ((ptr >= start) && (ptr + plen <= start + slen))
 373 
 374 /* we allocate one page more, to allow for offsets */
 375 #define SPI_TEST_MAX_SIZE_PLUS (SPI_TEST_MAX_SIZE + PAGE_SIZE)
 376 
 377 static void spi_test_print_hex_dump(char *pre, const void *ptr, size_t len)
 378 {
 379         /* limit the hex_dump */
 380         if (len < 1024) {
 381                 print_hex_dump(KERN_INFO, pre,
 382                                DUMP_PREFIX_OFFSET, 16, 1,
 383                                ptr, len, 0);
 384                 return;
 385         }
 386         /* print head */
 387         print_hex_dump(KERN_INFO, pre,
 388                        DUMP_PREFIX_OFFSET, 16, 1,
 389                        ptr, 512, 0);
 390         /* print tail */
 391         pr_info("%s truncated - continuing at offset %04zx\n",
 392                 pre, len - 512);
 393         print_hex_dump(KERN_INFO, pre,
 394                        DUMP_PREFIX_OFFSET, 16, 1,
 395                        ptr + (len - 512), 512, 0);
 396 }
 397 
 398 static void spi_test_dump_message(struct spi_device *spi,
 399                                   struct spi_message *msg,
 400                                   bool dump_data)
 401 {
 402         struct spi_transfer *xfer;
 403         int i;
 404         u8 b;
 405 
 406         dev_info(&spi->dev, "  spi_msg@%pK\n", msg);
 407         if (msg->status)
 408                 dev_info(&spi->dev, "    status:        %i\n",
 409                          msg->status);
 410         dev_info(&spi->dev, "    frame_length:  %i\n",
 411                  msg->frame_length);
 412         dev_info(&spi->dev, "    actual_length: %i\n",
 413                  msg->actual_length);
 414 
 415         list_for_each_entry(xfer, &msg->transfers, transfer_list) {
 416                 dev_info(&spi->dev, "    spi_transfer@%pK\n", xfer);
 417                 dev_info(&spi->dev, "      len:    %i\n", xfer->len);
 418                 dev_info(&spi->dev, "      tx_buf: %pK\n", xfer->tx_buf);
 419                 if (dump_data && xfer->tx_buf)
 420                         spi_test_print_hex_dump("          TX: ",
 421                                                 xfer->tx_buf,
 422                                                 xfer->len);
 423 
 424                 dev_info(&spi->dev, "      rx_buf: %pK\n", xfer->rx_buf);
 425                 if (dump_data && xfer->rx_buf)
 426                         spi_test_print_hex_dump("          RX: ",
 427                                                 xfer->rx_buf,
 428                                                 xfer->len);
 429                 /* check for unwritten test pattern on rx_buf */
 430                 if (xfer->rx_buf) {
 431                         for (i = 0 ; i < xfer->len ; i++) {
 432                                 b = ((u8 *)xfer->rx_buf)[xfer->len - 1 - i];
 433                                 if (b != SPI_TEST_PATTERN_UNWRITTEN)
 434                                         break;
 435                         }
 436                         if (i)
 437                                 dev_info(&spi->dev,
 438                                          "      rx_buf filled with %02x starts at offset: %i\n",
 439                                          SPI_TEST_PATTERN_UNWRITTEN,
 440                                          xfer->len - i);
 441                 }
 442         }
 443 }
 444 
 445 struct rx_ranges {
 446         struct list_head list;
 447         u8 *start;
 448         u8 *end;
 449 };
 450 
 451 static int rx_ranges_cmp(void *priv, struct list_head *a, struct list_head *b)
 452 {
 453         struct rx_ranges *rx_a = list_entry(a, struct rx_ranges, list);
 454         struct rx_ranges *rx_b = list_entry(b, struct rx_ranges, list);
 455 
 456         if (rx_a->start > rx_b->start)
 457                 return 1;
 458         if (rx_a->start < rx_b->start)
 459                 return -1;
 460         return 0;
 461 }
 462 
 463 static int spi_check_rx_ranges(struct spi_device *spi,
 464                                struct spi_message *msg,
 465                                void *rx)
 466 {
 467         struct spi_transfer *xfer;
 468         struct rx_ranges ranges[SPI_TEST_MAX_TRANSFERS], *r;
 469         int i = 0;
 470         LIST_HEAD(ranges_list);
 471         u8 *addr;
 472         int ret = 0;
 473 
 474         /* loop over all transfers to fill in the rx_ranges */
 475         list_for_each_entry(xfer, &msg->transfers, transfer_list) {
 476                 /* if there is no rx, then no check is needed */
 477                 if (!xfer->rx_buf)
 478                         continue;
 479                 /* fill in the rx_range */
 480                 if (RANGE_CHECK(xfer->rx_buf, xfer->len,
 481                                 rx, SPI_TEST_MAX_SIZE_PLUS)) {
 482                         ranges[i].start = xfer->rx_buf;
 483                         ranges[i].end = xfer->rx_buf + xfer->len;
 484                         list_add(&ranges[i].list, &ranges_list);
 485                         i++;
 486                 }
 487         }
 488 
 489         /* if no ranges, then we can return and avoid the checks...*/
 490         if (!i)
 491                 return 0;
 492 
 493         /* sort the list */
 494         list_sort(NULL, &ranges_list, rx_ranges_cmp);
 495 
 496         /* and iterate over all the rx addresses */
 497         for (addr = rx; addr < (u8 *)rx + SPI_TEST_MAX_SIZE_PLUS; addr++) {
 498                 /* if we are the DO not write pattern,
 499                  * then continue with the loop...
 500                  */
 501                 if (*addr == SPI_TEST_PATTERN_DO_NOT_WRITE)
 502                         continue;
 503 
 504                 /* check if we are inside a range */
 505                 list_for_each_entry(r, &ranges_list, list) {
 506                         /* if so then set to end... */
 507                         if ((addr >= r->start) && (addr < r->end))
 508                                 addr = r->end;
 509                 }
 510                 /* second test after a (hopefull) translation */
 511                 if (*addr == SPI_TEST_PATTERN_DO_NOT_WRITE)
 512                         continue;
 513 
 514                 /* if still not found then something has modified too much */
 515                 /* we could list the "closest" transfer here... */
 516                 dev_err(&spi->dev,
 517                         "loopback strangeness - rx changed outside of allowed range at: %pK\n",
 518                         addr);
 519                 /* do not return, only set ret,
 520                  * so that we list all addresses
 521                  */
 522                 ret = -ERANGE;
 523         }
 524 
 525         return ret;
 526 }
 527 
 528 static int spi_test_check_elapsed_time(struct spi_device *spi,
 529                                        struct spi_test *test)
 530 {
 531         int i;
 532         unsigned long long estimated_time = 0;
 533         unsigned long long delay_usecs = 0;
 534 
 535         for (i = 0; i < test->transfer_count; i++) {
 536                 struct spi_transfer *xfer = test->transfers + i;
 537                 unsigned long long nbits = (unsigned long long)BITS_PER_BYTE *
 538                                            xfer->len;
 539 
 540                 delay_usecs += xfer->delay_usecs;
 541                 if (!xfer->speed_hz)
 542                         continue;
 543                 estimated_time += div_u64(nbits * NSEC_PER_SEC, xfer->speed_hz);
 544         }
 545 
 546         estimated_time += delay_usecs * NSEC_PER_USEC;
 547         if (test->elapsed_time < estimated_time) {
 548                 dev_err(&spi->dev,
 549                         "elapsed time %lld ns is shorter than minimum estimated time %lld ns\n",
 550                         test->elapsed_time, estimated_time);
 551 
 552                 return -EINVAL;
 553         }
 554 
 555         return 0;
 556 }
 557 
 558 static int spi_test_check_loopback_result(struct spi_device *spi,
 559                                           struct spi_message *msg,
 560                                           void *tx, void *rx)
 561 {
 562         struct spi_transfer *xfer;
 563         u8 rxb, txb;
 564         size_t i;
 565         int ret;
 566 
 567         /* checks rx_buffer pattern are valid with loopback or without */
 568         if (check_ranges) {
 569                 ret = spi_check_rx_ranges(spi, msg, rx);
 570                 if (ret)
 571                         return ret;
 572         }
 573 
 574         /* if we run without loopback, then return now */
 575         if (!loopback)
 576                 return 0;
 577 
 578         /* if applicable to transfer check that rx_buf is equal to tx_buf */
 579         list_for_each_entry(xfer, &msg->transfers, transfer_list) {
 580                 /* if there is no rx, then no check is needed */
 581                 if (!xfer->len || !xfer->rx_buf)
 582                         continue;
 583                 /* so depending on tx_buf we need to handle things */
 584                 if (xfer->tx_buf) {
 585                         for (i = 0; i < xfer->len; i++) {
 586                                 txb = ((u8 *)xfer->tx_buf)[i];
 587                                 rxb = ((u8 *)xfer->rx_buf)[i];
 588                                 if (txb != rxb)
 589                                         goto mismatch_error;
 590                         }
 591                 } else {
 592                         /* first byte received */
 593                         txb = ((u8 *)xfer->rx_buf)[0];
 594                         /* first byte may be 0 or xff */
 595                         if (!((txb == 0) || (txb == 0xff))) {
 596                                 dev_err(&spi->dev,
 597                                         "loopback strangeness - we expect 0x00 or 0xff, but not 0x%02x\n",
 598                                         txb);
 599                                 return -EINVAL;
 600                         }
 601                         /* check that all bytes are identical */
 602                         for (i = 1; i < xfer->len; i++) {
 603                                 rxb = ((u8 *)xfer->rx_buf)[i];
 604                                 if (rxb != txb)
 605                                         goto mismatch_error;
 606                         }
 607                 }
 608         }
 609 
 610         return 0;
 611 
 612 mismatch_error:
 613         dev_err(&spi->dev,
 614                 "loopback strangeness - transfer mismatch on byte %04zx - expected 0x%02x, but got 0x%02x\n",
 615                 i, txb, rxb);
 616 
 617         return -EINVAL;
 618 }
 619 
 620 static int spi_test_translate(struct spi_device *spi,
 621                               void **ptr, size_t len,
 622                               void *tx, void *rx)
 623 {
 624         size_t off;
 625 
 626         /* return on null */
 627         if (!*ptr)
 628                 return 0;
 629 
 630         /* in the MAX_SIZE_HALF case modify the pointer */
 631         if (((size_t)*ptr) & SPI_TEST_MAX_SIZE_HALF)
 632                 /* move the pointer to the correct range */
 633                 *ptr += (SPI_TEST_MAX_SIZE_PLUS / 2) -
 634                         SPI_TEST_MAX_SIZE_HALF;
 635 
 636         /* RX range
 637          * - we check against MAX_SIZE_PLUS to allow for automated alignment
 638          */
 639         if (RANGE_CHECK(*ptr, len,  RX(0), SPI_TEST_MAX_SIZE_PLUS)) {
 640                 off = *ptr - RX(0);
 641                 *ptr = rx + off;
 642 
 643                 return 0;
 644         }
 645 
 646         /* TX range */
 647         if (RANGE_CHECK(*ptr, len,  TX(0), SPI_TEST_MAX_SIZE_PLUS)) {
 648                 off = *ptr - TX(0);
 649                 *ptr = tx + off;
 650 
 651                 return 0;
 652         }
 653 
 654         dev_err(&spi->dev,
 655                 "PointerRange [%pK:%pK[ not in range [%pK:%pK[ or [%pK:%pK[\n",
 656                 *ptr, *ptr + len,
 657                 RX(0), RX(SPI_TEST_MAX_SIZE),
 658                 TX(0), TX(SPI_TEST_MAX_SIZE));
 659 
 660         return -EINVAL;
 661 }
 662 
 663 static int spi_test_fill_pattern(struct spi_device *spi,
 664                                  struct spi_test *test)
 665 {
 666         struct spi_transfer *xfers = test->transfers;
 667         u8 *tx_buf;
 668         size_t count = 0;
 669         int i, j;
 670 
 671 #ifdef __BIG_ENDIAN
 672 #define GET_VALUE_BYTE(value, index, bytes) \
 673         (value >> (8 * (bytes - 1 - count % bytes)))
 674 #else
 675 #define GET_VALUE_BYTE(value, index, bytes) \
 676         (value >> (8 * (count % bytes)))
 677 #endif
 678 
 679         /* fill all transfers with the pattern requested */
 680         for (i = 0; i < test->transfer_count; i++) {
 681                 /* fill rx_buf with SPI_TEST_PATTERN_UNWRITTEN */
 682                 if (xfers[i].rx_buf)
 683                         memset(xfers[i].rx_buf, SPI_TEST_PATTERN_UNWRITTEN,
 684                                xfers[i].len);
 685                 /* if tx_buf is NULL then skip */
 686                 tx_buf = (u8 *)xfers[i].tx_buf;
 687                 if (!tx_buf)
 688                         continue;
 689                 /* modify all the transfers */
 690                 for (j = 0; j < xfers[i].len; j++, tx_buf++, count++) {
 691                         /* fill tx */
 692                         switch (test->fill_option) {
 693                         case FILL_MEMSET_8:
 694                                 *tx_buf = test->fill_pattern;
 695                                 break;
 696                         case FILL_MEMSET_16:
 697                                 *tx_buf = GET_VALUE_BYTE(test->fill_pattern,
 698                                                          count, 2);
 699                                 break;
 700                         case FILL_MEMSET_24:
 701                                 *tx_buf = GET_VALUE_BYTE(test->fill_pattern,
 702                                                          count, 3);
 703                                 break;
 704                         case FILL_MEMSET_32:
 705                                 *tx_buf = GET_VALUE_BYTE(test->fill_pattern,
 706                                                          count, 4);
 707                                 break;
 708                         case FILL_COUNT_8:
 709                                 *tx_buf = count;
 710                                 break;
 711                         case FILL_COUNT_16:
 712                                 *tx_buf = GET_VALUE_BYTE(count, count, 2);
 713                                 break;
 714                         case FILL_COUNT_24:
 715                                 *tx_buf = GET_VALUE_BYTE(count, count, 3);
 716                                 break;
 717                         case FILL_COUNT_32:
 718                                 *tx_buf = GET_VALUE_BYTE(count, count, 4);
 719                                 break;
 720                         case FILL_TRANSFER_BYTE_8:
 721                                 *tx_buf = j;
 722                                 break;
 723                         case FILL_TRANSFER_BYTE_16:
 724                                 *tx_buf = GET_VALUE_BYTE(j, j, 2);
 725                                 break;
 726                         case FILL_TRANSFER_BYTE_24:
 727                                 *tx_buf = GET_VALUE_BYTE(j, j, 3);
 728                                 break;
 729                         case FILL_TRANSFER_BYTE_32:
 730                                 *tx_buf = GET_VALUE_BYTE(j, j, 4);
 731                                 break;
 732                         case FILL_TRANSFER_NUM:
 733                                 *tx_buf = i;
 734                                 break;
 735                         default:
 736                                 dev_err(&spi->dev,
 737                                         "unsupported fill_option: %i\n",
 738                                         test->fill_option);
 739                                 return -EINVAL;
 740                         }
 741                 }
 742         }
 743 
 744         return 0;
 745 }
 746 
 747 static int _spi_test_run_iter(struct spi_device *spi,
 748                               struct spi_test *test,
 749                               void *tx, void *rx)
 750 {
 751         struct spi_message *msg = &test->msg;
 752         struct spi_transfer *x;
 753         int i, ret;
 754 
 755         /* initialize message - zero-filled via static initialization */
 756         spi_message_init_no_memset(msg);
 757 
 758         /* fill rx with the DO_NOT_WRITE pattern */
 759         memset(rx, SPI_TEST_PATTERN_DO_NOT_WRITE, SPI_TEST_MAX_SIZE_PLUS);
 760 
 761         /* add the individual transfers */
 762         for (i = 0; i < test->transfer_count; i++) {
 763                 x = &test->transfers[i];
 764 
 765                 /* patch the values of tx_buf */
 766                 ret = spi_test_translate(spi, (void **)&x->tx_buf, x->len,
 767                                          (void *)tx, rx);
 768                 if (ret)
 769                         return ret;
 770 
 771                 /* patch the values of rx_buf */
 772                 ret = spi_test_translate(spi, &x->rx_buf, x->len,
 773                                          (void *)tx, rx);
 774                 if (ret)
 775                         return ret;
 776 
 777                 /* and add it to the list */
 778                 spi_message_add_tail(x, msg);
 779         }
 780 
 781         /* fill in the transfer buffers with pattern */
 782         ret = spi_test_fill_pattern(spi, test);
 783         if (ret)
 784                 return ret;
 785 
 786         /* and execute */
 787         if (test->execute_msg)
 788                 ret = test->execute_msg(spi, test, tx, rx);
 789         else
 790                 ret = spi_test_execute_msg(spi, test, tx, rx);
 791 
 792         /* handle result */
 793         if (ret == test->expected_return)
 794                 return 0;
 795 
 796         dev_err(&spi->dev,
 797                 "test failed - test returned %i, but we expect %i\n",
 798                 ret, test->expected_return);
 799 
 800         if (ret)
 801                 return ret;
 802 
 803         /* if it is 0, as we expected something else,
 804          * then return something special
 805          */
 806         return -EFAULT;
 807 }
 808 
 809 static int spi_test_run_iter(struct spi_device *spi,
 810                              const struct spi_test *testtemplate,
 811                              void *tx, void *rx,
 812                              size_t len,
 813                              size_t tx_off,
 814                              size_t rx_off
 815         )
 816 {
 817         struct spi_test test;
 818         int i, tx_count, rx_count;
 819 
 820         /* copy the test template to test */
 821         memcpy(&test, testtemplate, sizeof(test));
 822 
 823         /* if iterate_transfer_mask is not set,
 824          * then set it to first transfer only
 825          */
 826         if (!(test.iterate_transfer_mask & (BIT(test.transfer_count) - 1)))
 827                 test.iterate_transfer_mask = 1;
 828 
 829         /* count number of transfers with tx/rx_buf != NULL */
 830         rx_count = tx_count = 0;
 831         for (i = 0; i < test.transfer_count; i++) {
 832                 if (test.transfers[i].tx_buf)
 833                         tx_count++;
 834                 if (test.transfers[i].rx_buf)
 835                         rx_count++;
 836         }
 837 
 838         /* in some iteration cases warn and exit early,
 839          * as there is nothing to do, that has not been tested already...
 840          */
 841         if (tx_off && (!tx_count)) {
 842                 dev_warn_once(&spi->dev,
 843                               "%s: iterate_tx_off configured with tx_buf==NULL - ignoring\n",
 844                               test.description);
 845                 return 0;
 846         }
 847         if (rx_off && (!rx_count)) {
 848                 dev_warn_once(&spi->dev,
 849                               "%s: iterate_rx_off configured with rx_buf==NULL - ignoring\n",
 850                               test.description);
 851                 return 0;
 852         }
 853 
 854         /* write out info */
 855         if (!(len || tx_off || rx_off)) {
 856                 dev_info(&spi->dev, "Running test %s\n", test.description);
 857         } else {
 858                 dev_info(&spi->dev,
 859                          "  with iteration values: len = %zu, tx_off = %zu, rx_off = %zu\n",
 860                          len, tx_off, rx_off);
 861         }
 862 
 863         /* update in the values from iteration values */
 864         for (i = 0; i < test.transfer_count; i++) {
 865                 /* only when bit in transfer mask is set */
 866                 if (!(test.iterate_transfer_mask & BIT(i)))
 867                         continue;
 868                 test.transfers[i].len = len;
 869                 if (test.transfers[i].tx_buf)
 870                         test.transfers[i].tx_buf += tx_off;
 871                 if (test.transfers[i].tx_buf)
 872                         test.transfers[i].rx_buf += rx_off;
 873         }
 874 
 875         /* and execute */
 876         return _spi_test_run_iter(spi, &test, tx, rx);
 877 }
 878 
 879 /**
 880  * spi_test_execute_msg - default implementation to run a test
 881  *
 882  * spi: @spi_device on which to run the @spi_message
 883  * test: the test to execute, which already contains @msg
 884  * tx:   the tx buffer allocated for the test sequence
 885  * rx:   the rx buffer allocated for the test sequence
 886  *
 887  * Returns: error code of spi_sync as well as basic error checking
 888  */
 889 int spi_test_execute_msg(struct spi_device *spi, struct spi_test *test,
 890                          void *tx, void *rx)
 891 {
 892         struct spi_message *msg = &test->msg;
 893         int ret = 0;
 894         int i;
 895 
 896         /* only if we do not simulate */
 897         if (!simulate_only) {
 898                 ktime_t start;
 899 
 900                 /* dump the complete message before and after the transfer */
 901                 if (dump_messages == 3)
 902                         spi_test_dump_message(spi, msg, true);
 903 
 904                 start = ktime_get();
 905                 /* run spi message */
 906                 ret = spi_sync(spi, msg);
 907                 test->elapsed_time = ktime_to_ns(ktime_sub(ktime_get(), start));
 908                 if (ret == -ETIMEDOUT) {
 909                         dev_info(&spi->dev,
 910                                  "spi-message timed out - rerunning...\n");
 911                         /* rerun after a few explicit schedules */
 912                         for (i = 0; i < 16; i++)
 913                                 schedule();
 914                         ret = spi_sync(spi, msg);
 915                 }
 916                 if (ret) {
 917                         dev_err(&spi->dev,
 918                                 "Failed to execute spi_message: %i\n",
 919                                 ret);
 920                         goto exit;
 921                 }
 922 
 923                 /* do some extra error checks */
 924                 if (msg->frame_length != msg->actual_length) {
 925                         dev_err(&spi->dev,
 926                                 "actual length differs from expected\n");
 927                         ret = -EIO;
 928                         goto exit;
 929                 }
 930 
 931                 /* run rx-buffer tests */
 932                 ret = spi_test_check_loopback_result(spi, msg, tx, rx);
 933                 if (ret)
 934                         goto exit;
 935 
 936                 ret = spi_test_check_elapsed_time(spi, test);
 937         }
 938 
 939         /* if requested or on error dump message (including data) */
 940 exit:
 941         if (dump_messages || ret)
 942                 spi_test_dump_message(spi, msg,
 943                                       (dump_messages >= 2) || (ret));
 944 
 945         return ret;
 946 }
 947 EXPORT_SYMBOL_GPL(spi_test_execute_msg);
 948 
 949 /**
 950  * spi_test_run_test - run an individual spi_test
 951  *                     including all the relevant iterations on:
 952  *                     length and buffer alignment
 953  *
 954  * spi:  the spi_device to send the messages to
 955  * test: the test which we need to execute
 956  * tx:   the tx buffer allocated for the test sequence
 957  * rx:   the rx buffer allocated for the test sequence
 958  *
 959  * Returns: status code of spi_sync or other failures
 960  */
 961 
 962 int spi_test_run_test(struct spi_device *spi, const struct spi_test *test,
 963                       void *tx, void *rx)
 964 {
 965         int idx_len;
 966         size_t len;
 967         size_t tx_align, rx_align;
 968         int ret;
 969 
 970         /* test for transfer limits */
 971         if (test->transfer_count >= SPI_TEST_MAX_TRANSFERS) {
 972                 dev_err(&spi->dev,
 973                         "%s: Exceeded max number of transfers with %i\n",
 974                         test->description, test->transfer_count);
 975                 return -E2BIG;
 976         }
 977 
 978         /* setting up some values in spi_message
 979          * based on some settings in spi_master
 980          * some of this can also get done in the run() method
 981          */
 982 
 983         /* iterate over all the iterable values using macros
 984          * (to make it a bit more readable...
 985          */
 986 #define FOR_EACH_ALIGNMENT(var)                                         \
 987         for (var = 0;                                                   \
 988             var < (test->iterate_##var ?                                \
 989                         (spi->master->dma_alignment ?                   \
 990                          spi->master->dma_alignment :                   \
 991                          test->iterate_##var) :                         \
 992                         1);                                             \
 993             var++)
 994 
 995         for (idx_len = 0; idx_len < SPI_TEST_MAX_ITERATE &&
 996              (len = test->iterate_len[idx_len]) != -1; idx_len++) {
 997                 FOR_EACH_ALIGNMENT(tx_align) {
 998                         FOR_EACH_ALIGNMENT(rx_align) {
 999                                 /* and run the iteration */
1000                                 ret = spi_test_run_iter(spi, test,
1001                                                         tx, rx,
1002                                                         len,
1003                                                         tx_align,
1004                                                         rx_align);
1005                                 if (ret)
1006                                         return ret;
1007                         }
1008                 }
1009         }
1010 
1011         return 0;
1012 }
1013 EXPORT_SYMBOL_GPL(spi_test_run_test);
1014 
1015 /**
1016  * spi_test_run_tests - run an array of spi_messages tests
1017  * @spi: the spi device on which to run the tests
1018  * @tests: NULL-terminated array of @spi_test
1019  *
1020  * Returns: status errors as per @spi_test_run_test()
1021  */
1022 
1023 int spi_test_run_tests(struct spi_device *spi,
1024                        struct spi_test *tests)
1025 {
1026         char *rx = NULL, *tx = NULL;
1027         int ret = 0, count = 0;
1028         struct spi_test *test;
1029 
1030         /* allocate rx/tx buffers of 128kB size without devm
1031          * in the hope that is on a page boundary
1032          */
1033         if (use_vmalloc)
1034                 rx = vmalloc(SPI_TEST_MAX_SIZE_PLUS);
1035         else
1036                 rx = kzalloc(SPI_TEST_MAX_SIZE_PLUS, GFP_KERNEL);
1037         if (!rx)
1038                 return -ENOMEM;
1039 
1040 
1041         if (use_vmalloc)
1042                 tx = vmalloc(SPI_TEST_MAX_SIZE_PLUS);
1043         else
1044                 tx = kzalloc(SPI_TEST_MAX_SIZE_PLUS, GFP_KERNEL);
1045         if (!tx) {
1046                 ret = -ENOMEM;
1047                 goto err_tx;
1048         }
1049 
1050         /* now run the individual tests in the table */
1051         for (test = tests, count = 0; test->description[0];
1052              test++, count++) {
1053                 /* only run test if requested */
1054                 if ((run_only_test > -1) && (count != run_only_test))
1055                         continue;
1056                 /* run custom implementation */
1057                 if (test->run_test)
1058                         ret = test->run_test(spi, test, tx, rx);
1059                 else
1060                         ret = spi_test_run_test(spi, test, tx, rx);
1061                 if (ret)
1062                         goto out;
1063                 /* add some delays so that we can easily
1064                  * detect the individual tests when using a logic analyzer
1065                  * we also add scheduling to avoid potential spi_timeouts...
1066                  */
1067                 mdelay(100);
1068                 schedule();
1069         }
1070 
1071 out:
1072         kvfree(tx);
1073 err_tx:
1074         kvfree(rx);
1075         return ret;
1076 }
1077 EXPORT_SYMBOL_GPL(spi_test_run_tests);
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/spi/spi-loopback-test.c

DEFINITIONS
