LXR linux/tools/testing/selftests/powerpc/tm/tm-tmspr.c

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * Copyright 2015, Michael Neuling, IBM Corp.
   4 *
   5 * Original: Michael Neuling 3/4/2014
   6 * Modified: Rashmica Gupta 8/12/2015
   7 *
   8 * Check if any of the Transaction Memory SPRs get corrupted.
   9 * - TFIAR  - stores address of location of transaction failure
  10 * - TFHAR  - stores address of software failure handler (if transaction
  11 *   fails)
  12 * - TEXASR - lots of info about the transacion(s)
  13 *
  14 * (1) create more threads than cpus
  15 * (2) in each thread:
  16 *      (a) set TFIAR and TFHAR a unique value
  17 *      (b) loop for awhile, continually checking to see if
  18 *      either register has been corrupted.
  19 *
  20 * (3) Loop:
  21 *      (a) begin transaction
  22 *      (b) abort transaction
  23 *      (c) check TEXASR to see if FS has been corrupted
  24 */
  25
  26#define _GNU_SOURCE
  27#include <stdio.h>
  28#include <stdlib.h>
  29#include <unistd.h>
  30#include <pthread.h>
  31#include <string.h>
  32
  33#include "utils.h"
  34#include "tm.h"
  35
  36int     num_loops       = 1000000;
  37int     passed = 1;
  38
  39void tfiar_tfhar(void *in)
  40{
  41        unsigned long tfhar, tfhar_rd, tfiar, tfiar_rd;
  42        int i;
  43
  44        /* TFIAR: Last bit has to be high so userspace can read register */
  45        tfiar = ((unsigned long)in) + 1;
  46        tfiar += 2;
  47        mtspr(SPRN_TFIAR, tfiar);
  48
  49        /* TFHAR: Last two bits are reserved */
  50        tfhar = ((unsigned long)in);
  51        tfhar &= ~0x3UL;
  52        tfhar += 4;
  53        mtspr(SPRN_TFHAR, tfhar);
  54
  55        for (i = 0; i < num_loops; i++) {
  56                tfhar_rd = mfspr(SPRN_TFHAR);
  57                tfiar_rd = mfspr(SPRN_TFIAR);
  58                if ( (tfhar != tfhar_rd) || (tfiar != tfiar_rd) ) {
  59                        passed = 0;
  60                        return;
  61                }
  62        }
  63        return;
  64}
  65
  66void texasr(void *in)
  67{
  68        unsigned long i;
  69        uint64_t result = 0;
  70
  71        for (i = 0; i < num_loops; i++) {
  72                asm __volatile__(
  73                        "tbegin.;"
  74                        "beq    3f ;"
  75                        "tabort. 0 ;"
  76                        "tend.;"
  77
  78                        /* Abort handler */
  79                        "3: ;"
  80                        ::: "memory");
  81
  82                /* Check the TEXASR */
  83                result = mfspr(SPRN_TEXASR);
  84                if ((result & TEXASR_FS) == 0) {
  85                        passed = 0;
  86                        return;
  87                }
  88        }
  89        return;
  90}
  91
  92int test_tmspr()
  93{
  94        pthread_t       *thread;
  95        int             thread_num;
  96        unsigned long   i;
  97
  98        SKIP_IF(!have_htm());
  99        SKIP_IF(htm_is_synthetic());
 100
 101        /* To cause some context switching */
 102        thread_num = 10 * sysconf(_SC_NPROCESSORS_ONLN);
 103
 104        thread = malloc(thread_num * sizeof(pthread_t));
 105        if (thread == NULL)
 106                return EXIT_FAILURE;
 107
 108        /* Test TFIAR and TFHAR */
 109        for (i = 0; i < thread_num; i += 2) {
 110                if (pthread_create(&thread[i], NULL, (void *)tfiar_tfhar,
 111                                   (void *)i))
 112                        return EXIT_FAILURE;
 113        }
 114        /* Test TEXASR */
 115        for (i = 1; i < thread_num; i += 2) {
 116                if (pthread_create(&thread[i], NULL, (void *)texasr, (void *)i))
 117                        return EXIT_FAILURE;
 118        }
 119
 120        for (i = 0; i < thread_num; i++) {
 121                if (pthread_join(thread[i], NULL) != 0)
 122                        return EXIT_FAILURE;
 123        }
 124
 125        free(thread);
 126
 127        if (passed)
 128                return 0;
 129        else
 130                return 1;
 131}
 132
 133int main(int argc, char *argv[])
 134{
 135        if (argc > 1) {
 136                if (strcmp(argv[1], "-h") == 0) {
 137                        printf("Syntax:\t [<num loops>]\n");
 138                        return 0;
 139                } else {
 140                        num_loops = atoi(argv[1]);
 141                }
 142        }
 143        return test_harness(test_tmspr, "tm_tmspr");
 144}
 145