On Wed, Oct 23, 2024 at 09:38:32PM +0100, Mark Brown wrote: > Currently we don't use the irritator signal in our floating point stress > tests so when we added ZA and ZT stress tests we didn't actually bother > implementing any actual action in the handlers, we just counted the signal > deliveries. In preparation for using the irritators let's implement them, > just trivially SMSTOP and SMSTART to reset all bits in the register to 0. > > Signed-off-by: Mark Brown <broo...@kernel.org>
Acked-by: Mark Rutland <mark.rutl...@arm.com> Mark. > --- > tools/testing/selftests/arm64/fp/za-test.S | 12 ++++-------- > tools/testing/selftests/arm64/fp/zt-test.S | 12 ++++-------- > 2 files changed, 8 insertions(+), 16 deletions(-) > > diff --git a/tools/testing/selftests/arm64/fp/za-test.S > b/tools/testing/selftests/arm64/fp/za-test.S > index > 1ee0ec36766d2bef92aff50a002813e76e22963c..f902e6ef9077bfa34fa7f85ce572ce3df4346789 > 100644 > --- a/tools/testing/selftests/arm64/fp/za-test.S > +++ b/tools/testing/selftests/arm64/fp/za-test.S > @@ -148,20 +148,16 @@ function check_za > b memcmp > endfunction > > -// Any SME register modified here can cause corruption in the main > -// thread -- but *only* the locations modified here. > +// Modify the live SME register state, signal return will undo our changes > function irritator_handler > // Increment the irritation signal count (x23): > ldr x0, [x2, #ucontext_regs + 8 * 23] > add x0, x0, #1 > str x0, [x2, #ucontext_regs + 8 * 23] > > - // Corrupt some random ZA data > -#if 0 > - movi v0.8b, #1 > - movi v9.16b, #2 > - movi v31.8b, #3 > -#endif > + // This will reset ZA to all bits 0 > + smstop > + smstart > > ret > endfunction > diff --git a/tools/testing/selftests/arm64/fp/zt-test.S > b/tools/testing/selftests/arm64/fp/zt-test.S > index > ade9c98abcdafc2755ef4796670566d99e919e5c..c96cb7c2ad4b406c54099fe3f73917259bd947e4 > 100644 > --- a/tools/testing/selftests/arm64/fp/zt-test.S > +++ b/tools/testing/selftests/arm64/fp/zt-test.S > @@ -117,20 +117,16 @@ function check_zt > b memcmp > endfunction > > -// Any SME register modified here can cause corruption in the main > -// thread -- but *only* the locations modified here. > +// Modify the live SME register state, signal return will undo our changes > function irritator_handler > // Increment the irritation signal count (x23): > ldr x0, [x2, #ucontext_regs + 8 * 23] > add x0, x0, #1 > str x0, [x2, #ucontext_regs + 8 * 23] > > - // Corrupt some random ZT data > -#if 0 > - movi v0.8b, #1 > - movi v9.16b, #2 > - movi v31.8b, #3 > -#endif > + // This will reset ZT to all bits 0 > + smstop > + smstart > > ret > endfunction > > -- > 2.39.2 >
