On 12/2/15, Rashmica Gupta <[email protected]> wrote:
> 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: Rashmica Gupta <[email protected]>
Please see the comments to the previous patch.
> ---
> Added more explanation and fixed up styling issue. No functional
> changes.
>
> tools/testing/selftests/powerpc/tm/.gitignore | 1 +
> tools/testing/selftests/powerpc/tm/Makefile | 2 +-
> tools/testing/selftests/powerpc/tm/tm-tar.c | 92
> +++++++++++++++++++++++++++
> 3 files changed, 94 insertions(+), 1 deletion(-)
> create mode 100644 tools/testing/selftests/powerpc/tm/tm-tar.c
>
> diff --git a/tools/testing/selftests/powerpc/tm/.gitignore
> b/tools/testing/selftests/powerpc/tm/.gitignore
> index 76eae258feeb..9bf6749550e3 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-fork
> tm-dscr
> +tm-tar
> diff --git a/tools/testing/selftests/powerpc/tm/Makefile
> b/tools/testing/selftests/powerpc/tm/Makefile
> index 59eec240339d..ab2992f69b4c 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-fork tm-dscr
> +TEST_PROGS := tm-resched-dscr tm-syscall tm-signal-msr-resv tm-signal-stack
> tm-fork tm-dscr 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..732f518c95cf
> --- /dev/null
> +++ b/tools/testing/selftests/powerpc/tm/tm-tar.c
> @@ -0,0 +1,92 @@
> +/*
> + * 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"
> +
> +#define SPRN_TAR 0x32f
> +
> +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 0;
> + } else {
> + num_loops = atoi(argv[1]);
> + }
> + }
> +
> + printf("Starting, %d loops\n", num_loops);
> +
> + test_harness(test_tar, "tm_tar");
> +}
> --
> 2.5.0
>
> _______________________________________________
> Linuxppc-dev mailing list
> [email protected]
> https://lists.ozlabs.org/listinfo/linuxppc-dev
_______________________________________________
Linuxppc-dev mailing list
[email protected]
https://lists.ozlabs.org/listinfo/linuxppc-dev
