diff --git a/tools/testing/selftests/powerpc/tm/.gitignore b/tools/testing/selftests/powerpc/tm/.gitignore index d216eddcd493..2ac376410c70 100644 --- a/tools/testing/selftests/powerpc/tm/.gitignore +++ b/tools/testing/selftests/powerpc/tm/.gitignore @@ -4,3 +4,4 @@ tm-signal-msr-resv tm-signal-stack tm-vmxcopy tm-fork +tm-tar diff --git a/tools/testing/selftests/powerpc/tm/Makefile b/tools/testing/selftests/powerpc/tm/Makefile index 2db475b12720..cb4b3bf57a4d 100644 --- a/tools/testing/selftests/powerpc/tm/Makefile +++ b/tools/testing/selftests/powerpc/tm/Makefile @@ -1,4 +1,4 @@ -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) diff --git a/tools/testing/selftests/powerpc/tm/tm-tar.c b/tools/testing/selftests/powerpc/tm/tm-tar.c new file mode 100644 index 000000000000..2d2fcc2b7a60 --- /dev/null +++ b/tools/testing/selftests/powerpc/tm/tm-tar.c @@ -0,0 +1,90 @@ +/* + * 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 +#include +#include +#include + +#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 []\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"); +}