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

   1 /*
   2  * Copyright 2015, Michael Neuling, IBM Corp.
   3  * Licensed under GPLv2.
   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
  27 #define _GNU_SOURCE
  28 #include <stdio.h>
  29 #include <stdlib.h>
  30 #include <unistd.h>
  31 #include <pthread.h>
  32 #include <string.h>
  33
  34 #include "utils.h"
  35 #include "tm.h"
  36
  37 int     num_loops       = 10000;
  38 int     passed = 1;
  39
  40 void tfiar_tfhar(void *in)
  41 {
  42         int i, cpu;
  43         unsigned long tfhar, tfhar_rd, tfiar, tfiar_rd;
  44         cpu_set_t cpuset;
  45
  46         CPU_ZERO(&cpuset);
  47         cpu = (unsigned long)in >> 1;
  48         CPU_SET(cpu, &cpuset);
  49         sched_setaffinity(0, sizeof(cpuset), &cpuset);
  50
  51         /* TFIAR: Last bit has to be high so userspace can read register */
  52         tfiar = ((unsigned long)in) + 1;
  53         tfiar += 2;
  54         mtspr(SPRN_TFIAR, tfiar);
  55
  56         /* TFHAR: Last two bits are reserved */
  57         tfhar = ((unsigned long)in);
  58         tfhar &= ~0x3UL;
  59         tfhar += 4;
  60         mtspr(SPRN_TFHAR, tfhar);
  61
  62         for (i = 0; i < num_loops; i++) {
  63                 tfhar_rd = mfspr(SPRN_TFHAR);
  64                 tfiar_rd = mfspr(SPRN_TFIAR);
  65                 if ( (tfhar != tfhar_rd) || (tfiar != tfiar_rd) ) {
  66                         passed = 0;
  67                         return;
  68                 }
  69         }
  70         return;
  71 }
  72
  73 void texasr(void *in)
  74 {
  75         unsigned long i;
  76         uint64_t result = 0;
  77
  78         for (i = 0; i < num_loops; i++) {
  79                 asm __volatile__(
  80                         "tbegin.;"
  81                         "beq    3f ;"
  82                         "tabort. 0 ;"
  83                         "tend.;"
  84
  85                         /* Abort handler */
  86                         "3: ;"
  87                         ::: "memory");
  88
  89                 /* Check the TEXASR */
  90                 result = mfspr(SPRN_TEXASR);
  91                 if ((result & TEXASR_FS) == 0) {
  92                         passed = 0;
  93                         return;
  94                 }
  95         }
  96         return;
  97 }
  98
  99 int test_tmspr()
 100 {
 101         pthread_t       *thread;
 102         int             thread_num;
 103         unsigned long   i;
 104
 105         SKIP_IF(!have_htm());
 106
 107         /* To cause some context switching */
 108         thread_num = 10 * sysconf(_SC_NPROCESSORS_ONLN);
 109
 110         thread = malloc(thread_num * sizeof(pthread_t));
 111         if (thread == NULL)
 112                 return EXIT_FAILURE;
 113
 114         /* Test TFIAR and TFHAR */
 115         for (i = 0; i < thread_num; i += 2) {
 116                 if (pthread_create(&thread[i], NULL, (void *)tfiar_tfhar,
 117                                    (void *)i))
 118                         return EXIT_FAILURE;
 119         }
 120         /* Test TEXASR */
 121         for (i = 1; i < thread_num; i += 2) {
 122                 if (pthread_create(&thread[i], NULL, (void *)texasr, (void *)i))
 123                         return EXIT_FAILURE;
 124         }
 125
 126         for (i = 0; i < thread_num; i++) {
 127                 if (pthread_join(thread[i], NULL) != 0)
 128                         return EXIT_FAILURE;
 129         }
 130
 131         free(thread);
 132
 133         if (passed)
 134                 return 0;
 135         else
 136                 return 1;
 137 }
 138
 139 int main(int argc, char *argv[])
 140 {
 141         if (argc > 1) {
 142                 if (strcmp(argv[1], "-h") == 0) {
 143                         printf("Syntax:\t [<num loops>]\n");
 144                         return 0;
 145                 } else {
 146                         num_loops = atoi(argv[1]);
 147                 }
 148         }
 149         return test_harness(test_tmspr, "tm_tmspr");
 150 }