On 01/13/2015 03:22 AM, Anshuman Khandual wrote:
> This patch adds a test which modifies the DSCR using mtspr instruction
> and verifies the change using mfspr instruction. It uses both the
> privilege state SPR as well as the problem state SPR for the purpose.
>
> Signed-off-by: Anshuman Khandual <khand...@linux.vnet.ibm.com>
> ---
> tools/testing/selftests/powerpc/dscr/Makefile | 2 +-
> .../selftests/powerpc/dscr/dscr_explicit_test.c | 72
> ++++++++++++++++++++++
> 2 files changed, 73 insertions(+), 1 deletion(-)
> create mode 100644 tools/testing/selftests/powerpc/dscr/dscr_explicit_test.c
>
> diff --git a/tools/testing/selftests/powerpc/dscr/Makefile
> b/tools/testing/selftests/powerpc/dscr/Makefile
> index 0aa90ab..aede453 100644
> --- a/tools/testing/selftests/powerpc/dscr/Makefile
> +++ b/tools/testing/selftests/powerpc/dscr/Makefile
> @@ -1,4 +1,4 @@
> -PROGS := dscr_default_test
> +PROGS := dscr_default_test dscr_explicit_test
>
> CFLAGS := $(CFLAGS) -lpthread
>
> diff --git a/tools/testing/selftests/powerpc/dscr/dscr_explicit_test.c
> b/tools/testing/selftests/powerpc/dscr/dscr_explicit_test.c
> new file mode 100644
> index 0000000..5c0b7c1
> --- /dev/null
> +++ b/tools/testing/selftests/powerpc/dscr/dscr_explicit_test.c
> @@ -0,0 +1,72 @@
> +/*
> + * POWER Data Stream Control Register (DSCR) explicit test
> + *
> + * This test modifies the DSCR value using mtspr instruction and
> + * verifies the change with mfspr instruction. It uses both the
> + * privilege state SPR and the problem state SPR for this purpose.
> + *
> + * When using the privilege state SPR, the instructions such as
> + * mfspr or mtspr are priviledged and the kernel emulates them
> + * for us. Instructions using problem state SPR can be exuecuted
> + * directly without any emulation if the HW supports them. Else
> + * they also get emulated by the kernel.
> + *
> + * Copyright (C) 2012 Anton Blanchard <an...@au.ibm.com>, IBM
> + * Copyright (C) 2015 Anshuman Khandual <khand...@linux.vnet.ibm.com>, IBM
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License
> + * as published by the Free Software Foundation; either version
> + * 2 of the License, or (at your option) any later version.
> + */
> +#include "dscr.h"
> +
> +int test_body(void)
> +{
> + unsigned long i, dscr = 0;
> +
> + srand(getpid());
> + set_dscr(dscr);
> +
> + for (i = 0; i < COUNT; i++) {
> + unsigned long cur_dscr, cur_dscr_usr;
> + double ret = uniform_deviate(rand());
> +
> + if (ret < 0.001) {
> + dscr++;
> + if (dscr > DSCR_MAX)
> + dscr = 0;
> +
> + set_dscr(dscr);
> + }
> +
> + cur_dscr = get_dscr();
> + if (cur_dscr != dscr) {
> + fprintf(stderr, "Kernel DSCR should be %ld but "
> + "is %ld\n", dscr, cur_dscr);
> + return 1;
> + }
> +
> + ret = uniform_deviate(rand());
> + if (ret < 0.001) {
> + dscr++;
> + if (dscr > DSCR_MAX)
> + dscr = 0;
> +
> + set_dscr_usr(dscr);
> + }
> +
> + cur_dscr_usr = get_dscr_usr();
> + if (cur_dscr_usr != dscr) {
> + fprintf(stderr, "User DSCR should be %ld but "
> + "is %ld\n", dscr, cur_dscr_usr);
> + return 1;
> + }
> + }
> + return 0;
> +}
> +
> +int main(int argc, char *argv[])
> +{
> + return test_harness(test_body, "dscr_explicit_test");
> +}
>
Could you please add a .gitignore for powerpc targets as we
discussed earlier. It can be separate patch.
Also, I would like to see the test results reports using
kselftest.h - it can be separate patch in the interest of
getting tests in.
Acked-by: Shuah Khan <shua...@osg.samsung.com>
Please take this through powerpc maintainer git.
thanks,
-- Shuah
--
Shuah Khan
Sr. Linux Kernel Developer
Open Source Innovation Group
Samsung Research America (Silicon Valley)
shua...@osg.samsung.com | (970) 217-8978
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