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kselftest/arm64: Implement irritators for ZA and ZT

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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.

Acked-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20241107-arm64-fp-stress-irritator-v2-4-c4b9622e36ee@kernel.org
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Mark Brown 2024-11-07 01:39:23 +00:00 committed by Catalin Marinas
parent ffca567fef
commit d65f27d240
2 changed files with 8 additions and 16 deletions
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12
tools/testing/selftests/arm64/fp/za-test.S
View File

@ -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

12
tools/testing/selftests/arm64/fp/zt-test.S
View File

@ -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