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Commit dbccb494 authored by Rashmica Gupta's avatar Rashmica Gupta Committed by Michael Ellerman
Browse files

selftests/powerpc: Add TM test to check if 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 the
TAR when the transaction is suspended should only remain there if the
transaction completes successfully.

Signed-off-by: default avatarRashmica Gupta <rashmicy@gmail.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent d95be4ca

tools/testing/selftests/powerpc/tm/.gitignore

+1 −0
Original line number Diff line number Diff line
@@ -4,3 +4,4 @@ tm-signal-msr-resv 
tm-signal-stack

tm-vmxcopy

tm-fork

tm-tar

tools/testing/selftests/powerpc/tm/Makefile

+1 −1
Original line number Diff line number Diff line 
TEST_PROGS := tm-resched-dscr tm-syscall tm-signal-msr-resv tm-signal-stack tm-vmxcopy tm-fork

TEST_PROGS := tm-resched-dscr tm-syscall tm-signal-msr-resv tm-signal-stack tm-vmxcopy tm-fork tm-tar



all: $(TEST_PROGS)

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

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+90 −0
Original line number Diff line number Diff line 
/*

 * 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;

}



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");

}