1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * linux/drivers/spi/spi-loopback-test.c
5 * (c) Martin Sperl <kernel@martin.sperl.org>
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
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>
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");
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 */
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 " \
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");
52 module_param(no_cs, int, 0);
53 MODULE_PARM_DESC(no_cs,
54 "if set Chip Select (CS) will not be used");
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 !)");
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");
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");
74 /* the actual tests to execute */
75 static struct spi_test spi_tests[] = {
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,
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,
99 .tx_buf = TX(PAGE_SIZE - 4),
100 .rx_buf = RX(PAGE_SIZE - 4),
105 .description = "tx-transfer - only",
106 .fill_option = FILL_COUNT_8,
107 .iterate_len = { ITERATE_MAX_LEN },
108 .iterate_tx_align = ITERATE_ALIGN,
117 .description = "rx-transfer - only",
118 .fill_option = FILL_COUNT_8,
119 .iterate_len = { ITERATE_MAX_LEN },
120 .iterate_rx_align = ITERATE_ALIGN,
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),
140 /* this is why we cant use ITERATE_MAX_LEN */
141 .tx_buf = TX(SPI_TEST_MAX_SIZE_HALF),
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),
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),
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),
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),
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),
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),
242 /* making sure we align without overwrite
243 * the reason we can not use ITERATE_MAX_LEN
245 .tx_buf = TX(SPI_TEST_MAX_SIZE_HALF),
246 .rx_buf = RX(SPI_TEST_MAX_SIZE_HALF),
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),
259 /* making sure we align without overwrite */
265 /* making sure we align without overwrite */
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),
285 /* making sure we align without overwrite */
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),
311 { /* end of tests sequence */ }
314 static int spi_loopback_test_probe(struct spi_device *spi)
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);
323 dev_err(&spi->dev, "SPI setup with SPI_LOOP or SPI_NO_CS failed (%d)\n",
329 dev_info(&spi->dev, "Executing spi-loopback-tests\n");
331 ret = spi_test_run_tests(spi, spi_tests);
333 dev_info(&spi->dev, "Finished spi-loopback-tests with return: %i\n",
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", },
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),
350 MODULE_DEVICE_TABLE(of, spi_loopback_test_of_match);
352 static struct spi_driver spi_loopback_test_driver = {
354 .name = "spi-loopback-test",
355 .owner = THIS_MODULE,
356 .of_match_table = spi_loopback_test_of_match,
358 .probe = spi_loopback_test_probe,
361 module_spi_driver(spi_loopback_test_driver);
363 MODULE_AUTHOR("Martin Sperl <kernel@martin.sperl.org>");
364 MODULE_DESCRIPTION("test spi_driver to check core functionality");
365 MODULE_LICENSE("GPL");
367 /*-------------------------------------------------------------------------*/
369 /* spi_test implementation */
371 #define RANGE_CHECK(ptr, plen, start, slen) \
372 ((ptr >= start) && (ptr + plen <= start + slen))
374 /* we allocate one page more, to allow for offsets */
375 #define SPI_TEST_MAX_SIZE_PLUS (SPI_TEST_MAX_SIZE + PAGE_SIZE)
377 static void spi_test_print_hex_dump(char *pre, const void *ptr, size_t len)
379 /* limit the hex_dump */
381 print_hex_dump(KERN_INFO, pre,
382 DUMP_PREFIX_OFFSET, 16, 1,
387 print_hex_dump(KERN_INFO, pre,
388 DUMP_PREFIX_OFFSET, 16, 1,
391 pr_info("%s truncated - continuing at offset %04zx\n",
393 print_hex_dump(KERN_INFO, pre,
394 DUMP_PREFIX_OFFSET, 16, 1,
395 ptr + (len - 512), 512, 0);
398 static void spi_test_dump_message(struct spi_device *spi,
399 struct spi_message *msg,
402 struct spi_transfer *xfer;
406 dev_info(&spi->dev, " spi_msg@%pK\n", msg);
408 dev_info(&spi->dev, " status: %i\n",
410 dev_info(&spi->dev, " frame_length: %i\n",
412 dev_info(&spi->dev, " actual_length: %i\n",
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: ",
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: ",
429 /* check for unwritten test pattern on 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)
438 " rx_buf filled with %02x starts at offset: %i\n",
439 SPI_TEST_PATTERN_UNWRITTEN,
446 struct list_head list;
451 static int rx_ranges_cmp(void *priv, struct list_head *a, struct list_head *b)
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);
456 if (rx_a->start > rx_b->start)
458 if (rx_a->start < rx_b->start)
463 static int spi_check_rx_ranges(struct spi_device *spi,
464 struct spi_message *msg,
467 struct spi_transfer *xfer;
468 struct rx_ranges ranges[SPI_TEST_MAX_TRANSFERS], *r;
470 LIST_HEAD(ranges_list);
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 */
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);
489 /* if no ranges, then we can return and avoid the checks...*/
494 list_sort(NULL, &ranges_list, rx_ranges_cmp);
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...
501 if (*addr == SPI_TEST_PATTERN_DO_NOT_WRITE)
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))
510 /* second test after a (hopefull) translation */
511 if (*addr == SPI_TEST_PATTERN_DO_NOT_WRITE)
514 /* if still not found then something has modified too much */
515 /* we could list the "closest" transfer here... */
517 "loopback strangeness - rx changed outside of allowed range at: %pK\n",
519 /* do not return, only set ret,
520 * so that we list all addresses
528 static int spi_test_check_elapsed_time(struct spi_device *spi,
529 struct spi_test *test)
532 unsigned long long estimated_time = 0;
533 unsigned long long delay_usecs = 0;
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 *
540 delay_usecs += xfer->delay_usecs;
543 estimated_time += div_u64(nbits * NSEC_PER_SEC, xfer->speed_hz);
546 estimated_time += delay_usecs * NSEC_PER_USEC;
547 if (test->elapsed_time < estimated_time) {
549 "elapsed time %lld ns is shorter than minimum estimated time %lld ns\n",
550 test->elapsed_time, estimated_time);
558 static int spi_test_check_loopback_result(struct spi_device *spi,
559 struct spi_message *msg,
562 struct spi_transfer *xfer;
567 /* checks rx_buffer pattern are valid with loopback or without */
569 ret = spi_check_rx_ranges(spi, msg, rx);
574 /* if we run without loopback, then return now */
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)
583 /* so depending on tx_buf we need to handle things */
585 for (i = 0; i < xfer->len; i++) {
586 txb = ((u8 *)xfer->tx_buf)[i];
587 rxb = ((u8 *)xfer->rx_buf)[i];
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))) {
597 "loopback strangeness - we expect 0x00 or 0xff, but not 0x%02x\n",
601 /* check that all bytes are identical */
602 for (i = 1; i < xfer->len; i++) {
603 rxb = ((u8 *)xfer->rx_buf)[i];
614 "loopback strangeness - transfer mismatch on byte %04zx - expected 0x%02x, but got 0x%02x\n",
620 static int spi_test_translate(struct spi_device *spi,
621 void **ptr, size_t len,
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;
637 * - we check against MAX_SIZE_PLUS to allow for automated alignment
639 if (RANGE_CHECK(*ptr, len, RX(0), SPI_TEST_MAX_SIZE_PLUS)) {
647 if (RANGE_CHECK(*ptr, len, TX(0), SPI_TEST_MAX_SIZE_PLUS)) {
655 "PointerRange [%pK:%pK[ not in range [%pK:%pK[ or [%pK:%pK[\n",
657 RX(0), RX(SPI_TEST_MAX_SIZE),
658 TX(0), TX(SPI_TEST_MAX_SIZE));
663 static int spi_test_fill_pattern(struct spi_device *spi,
664 struct spi_test *test)
666 struct spi_transfer *xfers = test->transfers;
672 #define GET_VALUE_BYTE(value, index, bytes) \
673 (value >> (8 * (bytes - 1 - count % bytes)))
675 #define GET_VALUE_BYTE(value, index, bytes) \
676 (value >> (8 * (count % bytes)))
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 */
683 memset(xfers[i].rx_buf, SPI_TEST_PATTERN_UNWRITTEN,
685 /* if tx_buf is NULL then skip */
686 tx_buf = (u8 *)xfers[i].tx_buf;
689 /* modify all the transfers */
690 for (j = 0; j < xfers[i].len; j++, tx_buf++, count++) {
692 switch (test->fill_option) {
694 *tx_buf = test->fill_pattern;
697 *tx_buf = GET_VALUE_BYTE(test->fill_pattern,
701 *tx_buf = GET_VALUE_BYTE(test->fill_pattern,
705 *tx_buf = GET_VALUE_BYTE(test->fill_pattern,
712 *tx_buf = GET_VALUE_BYTE(count, count, 2);
715 *tx_buf = GET_VALUE_BYTE(count, count, 3);
718 *tx_buf = GET_VALUE_BYTE(count, count, 4);
720 case FILL_TRANSFER_BYTE_8:
723 case FILL_TRANSFER_BYTE_16:
724 *tx_buf = GET_VALUE_BYTE(j, j, 2);
726 case FILL_TRANSFER_BYTE_24:
727 *tx_buf = GET_VALUE_BYTE(j, j, 3);
729 case FILL_TRANSFER_BYTE_32:
730 *tx_buf = GET_VALUE_BYTE(j, j, 4);
732 case FILL_TRANSFER_NUM:
737 "unsupported fill_option: %i\n",
747 static int _spi_test_run_iter(struct spi_device *spi,
748 struct spi_test *test,
751 struct spi_message *msg = &test->msg;
752 struct spi_transfer *x;
755 /* initialize message - zero-filled via static initialization */
756 spi_message_init_no_memset(msg);
758 /* fill rx with the DO_NOT_WRITE pattern */
759 memset(rx, SPI_TEST_PATTERN_DO_NOT_WRITE, SPI_TEST_MAX_SIZE_PLUS);
761 /* add the individual transfers */
762 for (i = 0; i < test->transfer_count; i++) {
763 x = &test->transfers[i];
765 /* patch the values of tx_buf */
766 ret = spi_test_translate(spi, (void **)&x->tx_buf, x->len,
771 /* patch the values of rx_buf */
772 ret = spi_test_translate(spi, &x->rx_buf, x->len,
777 /* and add it to the list */
778 spi_message_add_tail(x, msg);
781 /* fill in the transfer buffers with pattern */
782 ret = spi_test_fill_pattern(spi, test);
787 if (test->execute_msg)
788 ret = test->execute_msg(spi, test, tx, rx);
790 ret = spi_test_execute_msg(spi, test, tx, rx);
793 if (ret == test->expected_return)
797 "test failed - test returned %i, but we expect %i\n",
798 ret, test->expected_return);
803 /* if it is 0, as we expected something else,
804 * then return something special
809 static int spi_test_run_iter(struct spi_device *spi,
810 const struct spi_test *testtemplate,
817 struct spi_test test;
818 int i, tx_count, rx_count;
820 /* copy the test template to test */
821 memcpy(&test, testtemplate, sizeof(test));
823 /* if iterate_transfer_mask is not set,
824 * then set it to first transfer only
826 if (!(test.iterate_transfer_mask & (BIT(test.transfer_count) - 1)))
827 test.iterate_transfer_mask = 1;
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)
834 if (test.transfers[i].rx_buf)
838 /* in some iteration cases warn and exit early,
839 * as there is nothing to do, that has not been tested already...
841 if (tx_off && (!tx_count)) {
842 dev_warn_once(&spi->dev,
843 "%s: iterate_tx_off configured with tx_buf==NULL - ignoring\n",
847 if (rx_off && (!rx_count)) {
848 dev_warn_once(&spi->dev,
849 "%s: iterate_rx_off configured with rx_buf==NULL - ignoring\n",
855 if (!(len || tx_off || rx_off)) {
856 dev_info(&spi->dev, "Running test %s\n", test.description);
859 " with iteration values: len = %zu, tx_off = %zu, rx_off = %zu\n",
860 len, tx_off, rx_off);
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)))
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;
876 return _spi_test_run_iter(spi, &test, tx, rx);
880 * spi_test_execute_msg - default implementation to run a test
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
887 * Returns: error code of spi_sync as well as basic error checking
889 int spi_test_execute_msg(struct spi_device *spi, struct spi_test *test,
892 struct spi_message *msg = &test->msg;
896 /* only if we do not simulate */
897 if (!simulate_only) {
900 /* dump the complete message before and after the transfer */
901 if (dump_messages == 3)
902 spi_test_dump_message(spi, msg, true);
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) {
910 "spi-message timed out - rerunning...\n");
911 /* rerun after a few explicit schedules */
912 for (i = 0; i < 16; i++)
914 ret = spi_sync(spi, msg);
918 "Failed to execute spi_message: %i\n",
923 /* do some extra error checks */
924 if (msg->frame_length != msg->actual_length) {
926 "actual length differs from expected\n");
931 /* run rx-buffer tests */
932 ret = spi_test_check_loopback_result(spi, msg, tx, rx);
936 ret = spi_test_check_elapsed_time(spi, test);
939 /* if requested or on error dump message (including data) */
941 if (dump_messages || ret)
942 spi_test_dump_message(spi, msg,
943 (dump_messages >= 2) || (ret));
947 EXPORT_SYMBOL_GPL(spi_test_execute_msg);
950 * spi_test_run_test - run an individual spi_test
951 * including all the relevant iterations on:
952 * length and buffer alignment
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
959 * Returns: status code of spi_sync or other failures
962 int spi_test_run_test(struct spi_device *spi, const struct spi_test *test,
967 size_t tx_align, rx_align;
970 /* test for transfer limits */
971 if (test->transfer_count >= SPI_TEST_MAX_TRANSFERS) {
973 "%s: Exceeded max number of transfers with %i\n",
974 test->description, test->transfer_count);
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
983 /* iterate over all the iterable values using macros
984 * (to make it a bit more readable...
986 #define FOR_EACH_ALIGNMENT(var) \
988 var < (test->iterate_##var ? \
989 (spi->master->dma_alignment ? \
990 spi->master->dma_alignment : \
991 test->iterate_##var) : \
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,
1013 EXPORT_SYMBOL_GPL(spi_test_run_test);
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
1020 * Returns: status errors as per @spi_test_run_test()
1023 int spi_test_run_tests(struct spi_device *spi,
1024 struct spi_test *tests)
1026 char *rx = NULL, *tx = NULL;
1027 int ret = 0, count = 0;
1028 struct spi_test *test;
1030 /* allocate rx/tx buffers of 128kB size without devm
1031 * in the hope that is on a page boundary
1034 rx = vmalloc(SPI_TEST_MAX_SIZE_PLUS);
1036 rx = kzalloc(SPI_TEST_MAX_SIZE_PLUS, GFP_KERNEL);
1042 tx = vmalloc(SPI_TEST_MAX_SIZE_PLUS);
1044 tx = kzalloc(SPI_TEST_MAX_SIZE_PLUS, GFP_KERNEL);
1050 /* now run the individual tests in the table */
1051 for (test = tests, count = 0; test->description[0];
1053 /* only run test if requested */
1054 if ((run_only_test > -1) && (count != run_only_test))
1056 /* run custom implementation */
1058 ret = test->run_test(spi, test, tx, rx);
1060 ret = spi_test_run_test(spi, test, tx, rx);
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...
1077 EXPORT_SYMBOL_GPL(spi_test_run_tests);