Release 4.10 tools/testing/selftests/powerpc/tm/tm-tar.c

/*
 * Copyright 2015, Michael Neuling, IBM Corp.
 * Licensed under GPLv2.
 * Original: Michael Neuling 19/7/2013
 * Edited: Rashmica Gupta 01/12/2015
 *
 * Do some transactions, see if the tar is corrupted.
 * If the transaction is aborted, the TAR should be rolled back to the
 * checkpointed value before the transaction began. The value written to
 * TAR in suspended mode should only remain in TAR if the transaction
 * completes.
 */

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>

#include "tm.h"
#include "utils.h"


int	num_loops	= 10000;



int test_tar(void)
{
	int i;

	SKIP_IF(!have_htm());

	for (i = 0; i < num_loops; i++)
	{
		uint64_t result = 0;
		asm __volatile__(
                        "li     7, 1;"
                        "mtspr  %[tar], 7;"	/* tar = 1 */
			"tbegin.;"
                        "beq    3f;"
                        "li     4, 0x7000;"	/* Loop lots, to use time */
			"2:;"			/* Start loop */
			"li     7, 2;"
                        "mtspr  %[tar], 7;"	/* tar = 2 */
			"tsuspend.;"
                        "li     7, 3;"
                        "mtspr  %[tar], 7;"	/* tar = 3 */
			"tresume.;"
                        "subi   4, 4, 1;"
                        "cmpdi  4, 0;"
                        "bne    2b;"
                        "tend.;"

			/* Transaction sucess! TAR should be 3 */
			"mfspr  7, %[tar];"
                        "ori    %[res], 7, 4;"  // res = 3|4 = 7
			"b      4f;"

			/* Abort handler. TAR should be rolled back to 1 */
			"3:;"
                        "mfspr  7, %[tar];"
                        "ori    %[res], 7, 8;"	// res = 1|8 = 9
			"4:;"

                        : [res]"=r"(result)
                        : [tar]"i"(SPRN_TAR)
                           : "memory", "r0", "r4", "r7");

		/* If result is anything else other than 7 or 9, the tar
                 * value must have been corrupted. */
		if ((result != 7) && (result != 9))
			return 1;
	}
	return 0;
}

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rashmica gupta
rashmica gupta
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79
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int main(int argc, char *argv[])
{
	/* A low number of iterations (eg 100) can cause a false pass */
	if (argc > 1) {
		if (strcmp(argv[1], "-h") == 0) {
			printf("Syntax:\n\t%s [<num loops>]\n",
			       argv[0]);
			return 1;
		} else {
			num_loops = atoi(argv[1]);
		}
	}

	printf("Starting, %d loops\n", num_loops);

	return test_harness(test_tar, "tm_tar");
}
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rashmica gupta
rashmica gupta
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79
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Directory: tools/testing/selftests/powerpc/tm

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