b5a646a681
This test creates some threads, which write to TM SPRs, and then makes sure the registers maintain the correct values across context switches and contention with other threads. But currently the test finishes almost instantaneously, which reduces the chance of it hitting an interesting condition. So increase the number of loops, so it runs a bit longer, though still less than 2s on a Power8. Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20200813013445.686464-3-mpe@ellerman.id.au
143 lines
2.9 KiB
C
143 lines
2.9 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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*
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* Original: Michael Neuling 3/4/2014
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* Modified: Rashmica Gupta 8/12/2015
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*
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* Check if any of the Transaction Memory SPRs get corrupted.
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* - TFIAR - stores address of location of transaction failure
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* - TFHAR - stores address of software failure handler (if transaction
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* fails)
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* - TEXASR - lots of info about the transacion(s)
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*
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* (1) create more threads than cpus
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* (2) in each thread:
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* (a) set TFIAR and TFHAR a unique value
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* (b) loop for awhile, continually checking to see if
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* either register has been corrupted.
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*
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* (3) Loop:
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* (a) begin transaction
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* (b) abort transaction
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* (c) check TEXASR to see if FS has been corrupted
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*/
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#define _GNU_SOURCE
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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 <pthread.h>
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#include <string.h>
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#include "utils.h"
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#include "tm.h"
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int num_loops = 1000000;
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int passed = 1;
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void tfiar_tfhar(void *in)
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{
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unsigned long tfhar, tfhar_rd, tfiar, tfiar_rd;
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int i;
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/* TFIAR: Last bit has to be high so userspace can read register */
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tfiar = ((unsigned long)in) + 1;
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tfiar += 2;
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mtspr(SPRN_TFIAR, tfiar);
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/* TFHAR: Last two bits are reserved */
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tfhar = ((unsigned long)in);
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tfhar &= ~0x3UL;
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tfhar += 4;
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mtspr(SPRN_TFHAR, tfhar);
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for (i = 0; i < num_loops; i++) {
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tfhar_rd = mfspr(SPRN_TFHAR);
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tfiar_rd = mfspr(SPRN_TFIAR);
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if ( (tfhar != tfhar_rd) || (tfiar != tfiar_rd) ) {
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passed = 0;
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return;
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}
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}
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return;
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}
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void texasr(void *in)
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{
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unsigned long i;
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uint64_t result = 0;
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for (i = 0; i < num_loops; i++) {
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asm __volatile__(
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"tbegin.;"
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"beq 3f ;"
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"tabort. 0 ;"
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"tend.;"
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/* Abort handler */
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"3: ;"
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::: "memory");
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/* Check the TEXASR */
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result = mfspr(SPRN_TEXASR);
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if ((result & TEXASR_FS) == 0) {
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passed = 0;
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return;
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}
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}
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return;
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}
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int test_tmspr()
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{
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pthread_t *thread;
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int thread_num;
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unsigned long i;
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SKIP_IF(!have_htm());
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/* To cause some context switching */
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thread_num = 10 * sysconf(_SC_NPROCESSORS_ONLN);
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thread = malloc(thread_num * sizeof(pthread_t));
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if (thread == NULL)
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return EXIT_FAILURE;
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/* Test TFIAR and TFHAR */
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for (i = 0; i < thread_num; i += 2) {
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if (pthread_create(&thread[i], NULL, (void *)tfiar_tfhar,
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(void *)i))
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return EXIT_FAILURE;
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}
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/* Test TEXASR */
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for (i = 1; i < thread_num; i += 2) {
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if (pthread_create(&thread[i], NULL, (void *)texasr, (void *)i))
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return EXIT_FAILURE;
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}
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for (i = 0; i < thread_num; i++) {
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if (pthread_join(thread[i], NULL) != 0)
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return EXIT_FAILURE;
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}
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free(thread);
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if (passed)
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return 0;
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else
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return 1;
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}
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int main(int argc, char *argv[])
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{
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if (argc > 1) {
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if (strcmp(argv[1], "-h") == 0) {
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printf("Syntax:\t [<num loops>]\n");
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return 0;
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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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return test_harness(test_tmspr, "tm_tmspr");
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}
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