kselftest/arm64: Implement irritators for ZA and ZT

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>

diff --git a/tools/testing/selftests/arm64/fp/za-test.S b/tools/testing/selftests/arm64/fp/za-test.S
index 1ee0ec36766d2bef92aff50a002813e76e22963c..f902e6ef9077bfa34fa7f85ce572ce3df4346789 100644 (file)
--- 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 (file)
--- 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