e42edf9b9d
Transactional Memory was removed from the architecture in ISA v3.1. For threads running in P8/P9 compatibility mode on P10 a synthetic TM implementation is provided. In this implementation, tbegin. always sets cr0 eq meaning the abort handler is always called. This is not an issue as users of TM are expected to have a fallback non transactional way to make forward progress in the abort handler. The TEXASR indicates if a transaction failure is due to a synthetic implementation. Some of the TM self tests need a non-degenerate TM implementation for their testing to be meaningful so check for a synthetic implementation and skip the test if so. Signed-off-by: Jordan Niethe <jniethe5@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20210729041317.366612-2-jniethe5@gmail.com
119 lines
2.4 KiB
C
119 lines
2.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright 2017, Michael Neuling, IBM Corp.
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* Original: Breno Leitao <brenohl@br.ibm.com> &
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* Gustavo Bueno Romero <gromero@br.ibm.com>
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* Edited: Michael Neuling
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*
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* Force VMX unavailable during a transaction and see if it corrupts
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* the checkpointed VMX register state after the abort.
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*/
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#include <inttypes.h>
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#include <htmintrin.h>
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#include <string.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <pthread.h>
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#include <sys/mman.h>
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#include <unistd.h>
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#include "tm.h"
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#include "utils.h"
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int passed;
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void *worker(void *unused)
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{
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__int128 vmx0;
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uint64_t texasr;
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asm goto (
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"li 3, 1;" /* Stick non-zero value in VMX0 */
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"std 3, 0(%[vmx0_ptr]);"
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"lvx 0, 0, %[vmx0_ptr];"
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/* Wait here a bit so we get scheduled out 255 times */
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"lis 3, 0x3fff;"
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"1: ;"
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"addi 3, 3, -1;"
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"cmpdi 3, 0;"
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"bne 1b;"
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/* Kernel will hopefully turn VMX off now */
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"tbegin. ;"
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"beq failure;"
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/* Cause VMX unavail. Any VMX instruction */
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"vaddcuw 0,0,0;"
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"tend. ;"
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"b %l[success];"
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/* Check VMX0 sanity after abort */
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"failure: ;"
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"lvx 1, 0, %[vmx0_ptr];"
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"vcmpequb. 2, 0, 1;"
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"bc 4, 24, %l[value_mismatch];"
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"b %l[value_match];"
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:
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: [vmx0_ptr] "r"(&vmx0)
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: "r3"
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: success, value_match, value_mismatch
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);
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/* HTM aborted and VMX0 is corrupted */
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value_mismatch:
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texasr = __builtin_get_texasr();
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printf("\n\n==============\n\n");
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printf("Failure with error: %lx\n", _TEXASR_FAILURE_CODE(texasr));
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printf("Summary error : %lx\n", _TEXASR_FAILURE_SUMMARY(texasr));
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printf("TFIAR exact : %lx\n\n", _TEXASR_TFIAR_EXACT(texasr));
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passed = 0;
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return NULL;
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/* HTM aborted but VMX0 is correct */
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value_match:
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// printf("!");
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return NULL;
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success:
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// printf(".");
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return NULL;
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}
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int tm_vmx_unavail_test()
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{
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int threads;
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pthread_t *thread;
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SKIP_IF(!have_htm());
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SKIP_IF(htm_is_synthetic());
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passed = 1;
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threads = sysconf(_SC_NPROCESSORS_ONLN) * 4;
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thread = malloc(sizeof(pthread_t)*threads);
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if (!thread)
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return EXIT_FAILURE;
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for (uint64_t i = 0; i < threads; i++)
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pthread_create(&thread[i], NULL, &worker, NULL);
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for (uint64_t i = 0; i < threads; i++)
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pthread_join(thread[i], NULL);
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free(thread);
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return passed ? EXIT_SUCCESS : EXIT_FAILURE;
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}
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int main(int argc, char **argv)
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{
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return test_harness(tm_vmx_unavail_test, "tm_vmx_unavail_test");
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}
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