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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
92 lines
2 KiB
C
92 lines
2 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright 2015, Michael Neuling, IBM Corp.
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* Original: Michael Neuling 19/7/2013
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* Edited: Rashmica Gupta 01/12/2015
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*
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* Do some transactions, see if the tar is corrupted.
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* If the transaction is aborted, the TAR should be rolled back to the
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* checkpointed value before the transaction began. The value written to
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* TAR in suspended mode should only remain in TAR if the transaction
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* completes.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include "tm.h"
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#include "utils.h"
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int num_loops = 10000;
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int test_tar(void)
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{
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int i;
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SKIP_IF(!have_htm());
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SKIP_IF(htm_is_synthetic());
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SKIP_IF(!is_ppc64le());
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for (i = 0; i < num_loops; i++)
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{
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uint64_t result = 0;
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asm __volatile__(
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"li 7, 1;"
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"mtspr %[tar], 7;" /* tar = 1 */
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"tbegin.;"
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"beq 3f;"
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"li 4, 0x7000;" /* Loop lots, to use time */
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"2:;" /* Start loop */
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"li 7, 2;"
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"mtspr %[tar], 7;" /* tar = 2 */
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"tsuspend.;"
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"li 7, 3;"
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"mtspr %[tar], 7;" /* tar = 3 */
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"tresume.;"
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"subi 4, 4, 1;"
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"cmpdi 4, 0;"
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"bne 2b;"
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"tend.;"
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/* Transaction sucess! TAR should be 3 */
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"mfspr 7, %[tar];"
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"ori %[res], 7, 4;" // res = 3|4 = 7
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"b 4f;"
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/* Abort handler. TAR should be rolled back to 1 */
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"3:;"
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"mfspr 7, %[tar];"
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"ori %[res], 7, 8;" // res = 1|8 = 9
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"4:;"
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: [res]"=r"(result)
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: [tar]"i"(SPRN_TAR)
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: "memory", "r0", "r4", "r7");
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/* If result is anything else other than 7 or 9, the tar
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* value must have been corrupted. */
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if ((result != 7) && (result != 9))
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return 1;
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}
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return 0;
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}
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int main(int argc, char *argv[])
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{
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/* A low number of iterations (eg 100) can cause a false pass */
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if (argc > 1) {
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if (strcmp(argv[1], "-h") == 0) {
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printf("Syntax:\n\t%s [<num loops>]\n",
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argv[0]);
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return 1;
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} else {
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num_loops = atoi(argv[1]);
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}
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}
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printf("Starting, %d loops\n", num_loops);
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return test_harness(test_tar, "tm_tar");
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}
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