diff options
author | Anshuman Khandual <khandual@linux.vnet.ibm.com> | 2015-05-21 06:43:08 (GMT) |
---|---|---|
committer | Michael Ellerman <mpe@ellerman.id.au> | 2015-06-07 09:36:51 (GMT) |
commit | cc6a93f1c3d6923ebf2f305416d080e9afc7ee95 (patch) | |
tree | 3c36a80e644f446bdf074fc0166d898e14a6c40b /tools | |
parent | 1554f21a9890301d1b6586474396e7c9de586204 (diff) | |
download | linux-cc6a93f1c3d6923ebf2f305416d080e9afc7ee95.tar.xz |
selftests/powerpc: Add test for DSCR SPR numbers
This patch adds a test which verifies that the DSCR privilege and
problem state SPR read & write accesses while making sure that the
results are always the same irrespective of which SPR number is being
used.
Acked-by: Shuah Khan <shuahkh@osg.samsung.com>
Signed-off-by: Anshuman Khandual <khandual@linux.vnet.ibm.com>
Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'tools')
-rw-r--r-- | tools/testing/selftests/powerpc/dscr/Makefile | 2 | ||||
-rw-r--r-- | tools/testing/selftests/powerpc/dscr/dscr_user_test.c | 61 |
2 files changed, 62 insertions, 1 deletions
diff --git a/tools/testing/selftests/powerpc/dscr/Makefile b/tools/testing/selftests/powerpc/dscr/Makefile index d72c320..3c3856b 100644 --- a/tools/testing/selftests/powerpc/dscr/Makefile +++ b/tools/testing/selftests/powerpc/dscr/Makefile @@ -1,4 +1,4 @@ -TEST_PROGS := dscr_default_test dscr_explicit_test +TEST_PROGS := dscr_default_test dscr_explicit_test dscr_user_test dscr_default_test: LDLIBS += -lpthread diff --git a/tools/testing/selftests/powerpc/dscr/dscr_user_test.c b/tools/testing/selftests/powerpc/dscr/dscr_user_test.c new file mode 100644 index 0000000..77d16b5 --- /dev/null +++ b/tools/testing/selftests/powerpc/dscr/dscr_user_test.c @@ -0,0 +1,61 @@ +/* + * POWER Data Stream Control Register (DSCR) SPR test + * + * This test modifies the DSCR value through both the SPR number + * based mtspr instruction and then makes sure that the same is + * reflected through mfspr instruction using either of the SPR + * numbers. + * + * 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 2013, Anton Blanchard, IBM Corporation. + * Copyright 2015, Anshuman Khandual, IBM Corporation. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published + * by the Free Software Foundation. + */ +#include "dscr.h" + +static int check_dscr(char *str) +{ + unsigned long cur_dscr, cur_dscr_usr; + + cur_dscr = get_dscr(); + cur_dscr_usr = get_dscr_usr(); + if (cur_dscr != cur_dscr_usr) { + printf("%s set, kernel get %lx != user get %lx\n", + str, cur_dscr, cur_dscr_usr); + return 1; + } + return 0; +} + +int dscr_user(void) +{ + int i; + + check_dscr(""); + + for (i = 0; i < COUNT; i++) { + set_dscr(i); + if (check_dscr("kernel")) + return 1; + } + + for (i = 0; i < COUNT; i++) { + set_dscr_usr(i); + if (check_dscr("user")) + return 1; + } + return 0; +} + +int main(int argc, char *argv[]) +{ + return test_harness(dscr_user, "dscr_user_test"); +} |