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
108 lines
2.2 KiB
C
108 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright 2016, Cyril Bur, IBM Corp.
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*
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* Sending one self a signal should always get delivered.
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*/
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#include <errno.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <signal.h>
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#include <unistd.h>
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#include <altivec.h>
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#include "utils.h"
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#include "../tm/tm.h"
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#define MAX_ATTEMPT 500000
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#define TIMEOUT 10
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extern long tm_signal_self(pid_t pid, int sig, long *ret);
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static sig_atomic_t signaled;
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static sig_atomic_t fail;
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static void signal_handler(int sig)
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{
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if (tcheck_active()) {
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fail = 2;
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return;
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}
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if (sig == SIGUSR1)
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signaled = 1;
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else
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fail = 1;
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}
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static int test_signal_tm()
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{
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int i;
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struct sigaction act;
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act.sa_handler = signal_handler;
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act.sa_flags = 0;
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sigemptyset(&act.sa_mask);
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if (sigaction(SIGUSR1, &act, NULL) < 0) {
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perror("sigaction SIGUSR1");
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exit(1);
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}
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if (sigaction(SIGALRM, &act, NULL) < 0) {
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perror("sigaction SIGALRM");
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exit(1);
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}
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SKIP_IF(!have_htm());
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SKIP_IF(htm_is_synthetic());
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for (i = 0; i < MAX_ATTEMPT; i++) {
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/*
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* If anything bad happens in ASM and we fail to set ret
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* because *handwave* TM this will cause failure
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*/
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long ret = 0xdead;
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long rc = 0xbeef;
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alarm(0); /* Disable any pending */
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signaled = 0;
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alarm(TIMEOUT);
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FAIL_IF(tcheck_transactional());
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rc = tm_signal_self(getpid(), SIGUSR1, &ret);
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if (ret == 0xdead)
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/*
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* This basically means the transaction aborted before we
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* even got to the suspend... this is crazy but it
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* happens.
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* Yes this also means we might never make forward
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* progress... the alarm() will trip eventually...
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*/
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continue;
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if (rc || ret) {
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/* Ret is actually an errno */
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printf("TEXASR 0x%016lx, TFIAR 0x%016lx\n",
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__builtin_get_texasr(), __builtin_get_tfiar());
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fprintf(stderr, "(%d) Fail reason: %d rc=0x%lx ret=0x%lx\n",
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i, fail, rc, ret);
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FAIL_IF(ret);
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}
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while(!signaled && !fail)
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asm volatile("": : :"memory");
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if (!signaled) {
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fprintf(stderr, "(%d) Fail reason: %d rc=0x%lx ret=0x%lx\n",
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i, fail, rc, ret);
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FAIL_IF(fail); /* For the line number */
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}
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}
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return 0;
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}
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int main(void)
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{
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return test_harness(test_signal_tm, "signal_tm");
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}
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