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author | Michael Neuling <mikey@neuling.org> | 2017-05-08 17:16:27 +1000 |
---|---|---|
committer | Michael Ellerman <mpe@ellerman.id.au> | 2017-05-16 13:03:05 +1000 |
commit | cde97f8492ac4425c4d0647a308e15e78cb4c218 (patch) | |
tree | 44851d0071a6ccda4870fd9c0a21719480187758 /tools/testing/selftests/powerpc | |
parent | f48e91e87e67b56bef63393d1a02c6e22c1d7078 (diff) | |
download | op-kernel-dev-cde97f8492ac4425c4d0647a308e15e78cb4c218.zip op-kernel-dev-cde97f8492ac4425c4d0647a308e15e78cb4c218.tar.gz |
selftests/powerpc: Test TM and VMX register state
Test that the VMX checkpointed register state is maintained when a VMX
unavailable exception is taken during a transaction.
Thanks to Breno Leitao <brenohl@br.ibm.com> and
Gustavo Bueno Romero <gromero@br.ibm.com> for the original test this
is based heavily on.
Signed-off-by: Michael Neuling <mikey@neuling.org>
Reviewed-by: Cyril Bur <cyrilbur@gmail.com>
[mpe: Add to .gitignore, always build it 64-bit to fix build errors]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'tools/testing/selftests/powerpc')
-rw-r--r-- | tools/testing/selftests/powerpc/tm/.gitignore | 1 | ||||
-rw-r--r-- | tools/testing/selftests/powerpc/tm/Makefile | 4 | ||||
-rw-r--r-- | tools/testing/selftests/powerpc/tm/tm-vmx-unavail.c | 118 |
3 files changed, 122 insertions, 1 deletions
diff --git a/tools/testing/selftests/powerpc/tm/.gitignore b/tools/testing/selftests/powerpc/tm/.gitignore index 4276217..2f1f7b01 100644 --- a/tools/testing/selftests/powerpc/tm/.gitignore +++ b/tools/testing/selftests/powerpc/tm/.gitignore @@ -11,3 +11,4 @@ tm-signal-context-chk-fpu tm-signal-context-chk-gpr tm-signal-context-chk-vmx tm-signal-context-chk-vsx +tm-vmx-unavail diff --git a/tools/testing/selftests/powerpc/tm/Makefile b/tools/testing/selftests/powerpc/tm/Makefile index 5576ee6..958c11c 100644 --- a/tools/testing/selftests/powerpc/tm/Makefile +++ b/tools/testing/selftests/powerpc/tm/Makefile @@ -2,7 +2,8 @@ SIGNAL_CONTEXT_CHK_TESTS := tm-signal-context-chk-gpr tm-signal-context-chk-fpu tm-signal-context-chk-vmx tm-signal-context-chk-vsx TEST_GEN_PROGS := tm-resched-dscr tm-syscall tm-signal-msr-resv tm-signal-stack \ - tm-vmxcopy tm-fork tm-tar tm-tmspr $(SIGNAL_CONTEXT_CHK_TESTS) + tm-vmxcopy tm-fork tm-tar tm-tmspr tm-vmx-unavail \ + $(SIGNAL_CONTEXT_CHK_TESTS) include ../../lib.mk @@ -13,6 +14,7 @@ CFLAGS += -mhtm $(OUTPUT)/tm-syscall: tm-syscall-asm.S $(OUTPUT)/tm-syscall: CFLAGS += -I../../../../../usr/include $(OUTPUT)/tm-tmspr: CFLAGS += -pthread +$(OUTPUT)/tm-vmx-unavail: CFLAGS += -pthread -m64 SIGNAL_CONTEXT_CHK_TESTS := $(patsubst %,$(OUTPUT)/%,$(SIGNAL_CONTEXT_CHK_TESTS)) $(SIGNAL_CONTEXT_CHK_TESTS): tm-signal.S diff --git a/tools/testing/selftests/powerpc/tm/tm-vmx-unavail.c b/tools/testing/selftests/powerpc/tm/tm-vmx-unavail.c new file mode 100644 index 0000000..137185b --- /dev/null +++ b/tools/testing/selftests/powerpc/tm/tm-vmx-unavail.c @@ -0,0 +1,118 @@ +/* + * Copyright 2017, Michael Neuling, IBM Corp. + * Licensed under GPLv2. + * Original: Breno Leitao <brenohl@br.ibm.com> & + * Gustavo Bueno Romero <gromero@br.ibm.com> + * Edited: Michael Neuling + * + * Force VMX unavailable during a transaction and see if it corrupts + * the checkpointed VMX register state after the abort. + */ + +#include <inttypes.h> +#include <htmintrin.h> +#include <string.h> +#include <stdlib.h> +#include <stdio.h> +#include <pthread.h> +#include <sys/mman.h> +#include <unistd.h> +#include <pthread.h> + +#include "tm.h" +#include "utils.h" + +int passed; + +void *worker(void *unused) +{ + __int128 vmx0; + uint64_t texasr; + + asm goto ( + "li 3, 1;" /* Stick non-zero value in VMX0 */ + "std 3, 0(%[vmx0_ptr]);" + "lvx 0, 0, %[vmx0_ptr];" + + /* Wait here a bit so we get scheduled out 255 times */ + "lis 3, 0x3fff;" + "1: ;" + "addi 3, 3, -1;" + "cmpdi 3, 0;" + "bne 1b;" + + /* Kernel will hopefully turn VMX off now */ + + "tbegin. ;" + "beq failure;" + + /* Cause VMX unavail. Any VMX instruction */ + "vaddcuw 0,0,0;" + + "tend. ;" + "b %l[success];" + + /* Check VMX0 sanity after abort */ + "failure: ;" + "lvx 1, 0, %[vmx0_ptr];" + "vcmpequb. 2, 0, 1;" + "bc 4, 24, %l[value_mismatch];" + "b %l[value_match];" + : + : [vmx0_ptr] "r"(&vmx0) + : "r3" + : success, value_match, value_mismatch + ); + + /* HTM aborted and VMX0 is corrupted */ +value_mismatch: + texasr = __builtin_get_texasr(); + + printf("\n\n==============\n\n"); + printf("Failure with error: %lx\n", _TEXASR_FAILURE_CODE(texasr)); + printf("Summary error : %lx\n", _TEXASR_FAILURE_SUMMARY(texasr)); + printf("TFIAR exact : %lx\n\n", _TEXASR_TFIAR_EXACT(texasr)); + + passed = 0; + return NULL; + + /* HTM aborted but VMX0 is correct */ +value_match: +// printf("!"); + return NULL; + +success: +// printf("."); + return NULL; +} + +int tm_vmx_unavail_test() +{ + int threads; + pthread_t *thread; + + SKIP_IF(!have_htm()); + + passed = 1; + + threads = sysconf(_SC_NPROCESSORS_ONLN) * 4; + thread = malloc(sizeof(pthread_t)*threads); + if (!thread) + return EXIT_FAILURE; + + for (uint64_t i = 0; i < threads; i++) + pthread_create(&thread[i], NULL, &worker, NULL); + + for (uint64_t i = 0; i < threads; i++) + pthread_join(thread[i], NULL); + + free(thread); + + return passed ? EXIT_SUCCESS : EXIT_FAILURE; +} + + +int main(int argc, char **argv) +{ + return test_harness(tm_vmx_unavail_test, "tm_vmx_unavail_test"); +} |