[v1,0/3] kselftest/arm64: Vector length configuration tests

Message

Mark Brown July 27, 2021, 6:06 p.m. UTC

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-blog/posts/scalable-matrix-extension-armv9-a-architecture

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