Currently we don't have full automated tests for the vector length configuation ABIs offered for SVE, we have a helper binary for setting the vector length which can be used for manual tests and we use the prctl() interface to enumerate the vector lengths but don't actually verify that the vector lengths enumerated were set.
This patch series provides a small helper which allows us to get the currently configured vector length using the RDVL instruction via either a library call or stdout of a process and then uses this to both add verification of enumerated vector lengths to our existing tests and also add a new test program which exercises both the prctl() and sysfs interfaces.
In preparation for the forthcomng support for the Scalable Matrix Extension (SME) [1] which introduces a new vector length managed via a very similar hardware interface the helper and new test program are parameterised with the goal of allowing reuse for SME.
[1] https://community.arm.com/developer/ip-products/processors/b/processors-ip-b...
Mark Brown (3): kselftest/arm64: Provide a helper binary and "library" for SVE RDVL kselftest/arm64: Validate vector lengths are set in sve-probe-vls kselftest/arm64: Add tests for SVE vector configuration
tools/testing/selftests/arm64/fp/.gitignore | 2 + tools/testing/selftests/arm64/fp/Makefile | 11 +- tools/testing/selftests/arm64/fp/rdvl-sve.c | 14 + tools/testing/selftests/arm64/fp/rdvl.S | 9 + tools/testing/selftests/arm64/fp/rdvl.h | 8 + .../selftests/arm64/fp/sve-probe-vls.c | 5 + tools/testing/selftests/arm64/fp/vec-syscfg.c | 578 ++++++++++++++++++ 7 files changed, 624 insertions(+), 3 deletions(-) create mode 100644 tools/testing/selftests/arm64/fp/rdvl-sve.c create mode 100644 tools/testing/selftests/arm64/fp/rdvl.S create mode 100644 tools/testing/selftests/arm64/fp/rdvl.h create mode 100644 tools/testing/selftests/arm64/fp/vec-syscfg.c
base-commit: ff1176468d368232b684f75e82563369208bc371