tools/testing/selftests/powerpc/tm/tm-vmx-unavail.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright 2017, Michael Neuling, IBM Corp.
   4  * Original: Breno Leitao <brenohl@br.ibm.com> &
   5  *           Gustavo Bueno Romero <gromero@br.ibm.com>
   6  * Edited: Michael Neuling
   7  *
   8  * Force VMX unavailable during a transaction and see if it corrupts
   9  * the checkpointed VMX register state after the abort.
  10  */
  11
  12 #include <inttypes.h>
  13 #include <htmintrin.h>
  14 #include <string.h>
  15 #include <stdlib.h>
  16 #include <stdio.h>
  17 #include <pthread.h>
  18 #include <sys/mman.h>
  19 #include <unistd.h>
  20
  21 #include "tm.h"
  22 #include "utils.h"
  23
  24 int passed;
  25
  26 void *worker(void *unused)
  27 {
  28         __int128 vmx0;
  29         uint64_t texasr;
  30
  31         asm goto (
  32                 "li       3, 1;"  /* Stick non-zero value in VMX0 */
  33                 "std      3, 0(%[vmx0_ptr]);"
  34                 "lvx      0, 0, %[vmx0_ptr];"
  35
  36                 /* Wait here a bit so we get scheduled out 255 times */
  37                 "lis      3, 0x3fff;"
  38                 "1: ;"
  39                 "addi     3, 3, -1;"
  40                 "cmpdi    3, 0;"
  41                 "bne      1b;"
  42
  43                 /* Kernel will hopefully turn VMX off now */
  44
  45                 "tbegin. ;"
  46                 "beq      failure;"
  47
  48                 /* Cause VMX unavail. Any VMX instruction */
  49                 "vaddcuw  0,0,0;"
  50
  51                 "tend. ;"
  52                 "b        %l[success];"
  53
  54                 /* Check VMX0 sanity after abort */
  55                 "failure: ;"
  56                 "lvx       1,  0, %[vmx0_ptr];"
  57                 "vcmpequb. 2,  0, 1;"
  58                 "bc        4, 24, %l[value_mismatch];"
  59                 "b        %l[value_match];"
  60                 :
  61                 : [vmx0_ptr] "r"(&vmx0)
  62                 : "r3"
  63                 : success, value_match, value_mismatch
  64                 );
  65
  66         /* HTM aborted and VMX0 is corrupted */
  67 value_mismatch:
  68         texasr = __builtin_get_texasr();
  69
  70         printf("\n\n==============\n\n");
  71         printf("Failure with error: %lx\n",   _TEXASR_FAILURE_CODE(texasr));
  72         printf("Summary error     : %lx\n",   _TEXASR_FAILURE_SUMMARY(texasr));
  73         printf("TFIAR exact       : %lx\n\n", _TEXASR_TFIAR_EXACT(texasr));
  74
  75         passed = 0;
  76         return NULL;
  77
  78         /* HTM aborted but VMX0 is correct */
  79 value_match:
  80 //      printf("!");
  81         return NULL;
  82
  83 success:
  84 //      printf(".");
  85         return NULL;
  86 }
  87
  88 int tm_vmx_unavail_test()
  89 {
  90         int threads;
  91         pthread_t *thread;
  92
  93         SKIP_IF(!have_htm());
  94         SKIP_IF(htm_is_synthetic());
  95
  96         passed = 1;
  97
  98         threads = sysconf(_SC_NPROCESSORS_ONLN) * 4;
  99         thread = malloc(sizeof(pthread_t)*threads);
 100         if (!thread)
 101                 return EXIT_FAILURE;
 102
 103         for (uint64_t i = 0; i < threads; i++)
 104                 pthread_create(&thread[i], NULL, &worker, NULL);
 105
 106         for (uint64_t i = 0; i < threads; i++)
 107                 pthread_join(thread[i], NULL);
 108
 109         free(thread);
 110
 111         return passed ? EXIT_SUCCESS : EXIT_FAILURE;
 112 }
 113
 114
 115 int main(int argc, char **argv)
 116 {
 117         return test_harness(tm_vmx_unavail_test, "tm_vmx_unavail_test");
 118 }