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selftests: arm64: Add coverage of ptrace flags for SVE VL inheritance 

Add a test that covers enabling and disabling of SVE vector length
inheritance via the ptrace interface.

Signed-off-by: Mark Brown <broonie@kernel.org>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Link: https://lore.kernel.org/r/20211005123537.976795-1-broonie@kernel.org
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Mark Brown 2021-10-05 13:35:37 +01:00 committed by Will Deacon
parent 8694e5e638
commit 0ba1ce1e86
1 changed files with 54 additions and 1 deletions
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55
tools/testing/selftests/arm64/fp/sve-ptrace.c
View File

@ -22,7 +22,7 @@
#include "../../kselftest.h"
#define VL_TESTS (((SVE_VQ_MAX - SVE_VQ_MIN) + 1) * 3)
#define FPSIMD_TESTS 3
#define FPSIMD_TESTS 5
#define EXPECTED_TESTS (VL_TESTS + FPSIMD_TESTS)
@ -105,6 +105,56 @@ static int set_sve(pid_t pid, const struct user_sve_header *sve)
return ptrace(PTRACE_SETREGSET, pid, NT_ARM_SVE, &iov);
}
/* Validate setting and getting the inherit flag */
static void ptrace_set_get_inherit(pid_t child)
{
struct user_sve_header sve;
struct user_sve_header *new_sve = NULL;
size_t new_sve_size = 0;
int ret;
/* First set the flag */
memset(&sve, 0, sizeof(sve));
sve.size = sizeof(sve);
sve.vl = sve_vl_from_vq(SVE_VQ_MIN);
sve.flags = SVE_PT_VL_INHERIT;
ret = set_sve(child, &sve);
if (ret != 0) {
ksft_test_result_fail("Failed to set SVE_PT_VL_INHERIT\n");
return;
}
/*
* Read back the new register state and verify that we have
* set the flags we expected.
*/
if (!get_sve(child, (void **)&new_sve, &new_sve_size)) {
ksft_test_result_fail("Failed to read SVE flags\n");
return;
}
ksft_test_result(new_sve->flags & SVE_PT_VL_INHERIT,
"SVE_PT_VL_INHERIT set\n");
/* Now clear */
sve.flags &= ~SVE_PT_VL_INHERIT;
ret = set_sve(child, &sve);
if (ret != 0) {
ksft_test_result_fail("Failed to clear SVE_PT_VL_INHERIT\n");
return;
}
if (!get_sve(child, (void **)&new_sve, &new_sve_size)) {
ksft_test_result_fail("Failed to read SVE flags\n");
return;
}
ksft_test_result(!(new_sve->flags & SVE_PT_VL_INHERIT),
"SVE_PT_VL_INHERIT cleared\n");
free(new_sve);
}
/* Validate attempting to set the specfied VL via ptrace */
static void ptrace_set_get_vl(pid_t child, unsigned int vl, bool *supported)
{
@ -452,6 +502,9 @@ static int do_parent(pid_t child)
/* FPSIMD via SVE regset */
ptrace_sve_fpsimd(child);
/* prctl() flags */
ptrace_set_get_inherit(child);
/* Step through every possible VQ */
for (vq = SVE_VQ_MIN; vq <= SVE_VQ_MAX; vq++) {
vl = sve_vl_from_vq(vq);