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

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright 2015, Sam Bobroff, IBM Corp.
   4  *
   5  * Test the kernel's system call code to ensure that a system call
   6  * made from within an active HTM transaction is aborted with the
   7  * correct failure code.
   8  * Conversely, ensure that a system call made from within a
   9  * suspended transaction can succeed.
  10  */
  11
  12 #include <stdio.h>
  13 #include <unistd.h>
  14 #include <sys/syscall.h>
  15 #include <asm/tm.h>
  16 #include <sys/time.h>
  17 #include <stdlib.h>
  18
  19 #include "utils.h"
  20 #include "tm.h"
  21
  22 #ifndef PPC_FEATURE2_SCV
  23 #define PPC_FEATURE2_SCV               0x00100000 /* scv syscall */
  24 #endif
  25
  26 extern int getppid_tm_active(void);
  27 extern int getppid_tm_suspended(void);
  28 extern int getppid_scv_tm_active(void);
  29 extern int getppid_scv_tm_suspended(void);
  30
  31 unsigned retries = 0;
  32
  33 #define TEST_DURATION 10 /* seconds */
  34
  35 pid_t getppid_tm(bool scv, bool suspend)
  36 {
  37         int i;
  38         pid_t pid;
  39
  40         for (i = 0; i < TM_RETRIES; i++) {
  41                 if (suspend) {
  42                         if (scv)
  43                                 pid = getppid_scv_tm_suspended();
  44                         else
  45                                 pid = getppid_tm_suspended();
  46                 } else {
  47                         if (scv)
  48                                 pid = getppid_scv_tm_active();
  49                         else
  50                                 pid = getppid_tm_active();
  51                 }
  52
  53                 if (pid >= 0)
  54                         return pid;
  55
  56                 if (failure_is_persistent()) {
  57                         if (failure_is_syscall())
  58                                 return -1;
  59
  60                         printf("Unexpected persistent transaction failure.\n");
  61                         printf("TEXASR 0x%016lx, TFIAR 0x%016lx.\n",
  62                                __builtin_get_texasr(), __builtin_get_tfiar());
  63                         exit(-1);
  64                 }
  65
  66                 retries++;
  67         }
  68
  69         printf("Exceeded limit of %d temporary transaction failures.\n", TM_RETRIES);
  70         printf("TEXASR 0x%016lx, TFIAR 0x%016lx.\n",
  71                __builtin_get_texasr(), __builtin_get_tfiar());
  72
  73         exit(-1);
  74 }
  75
  76 int tm_syscall(void)
  77 {
  78         unsigned count = 0;
  79         struct timeval end, now;
  80
  81         SKIP_IF(!have_htm_nosc());
  82         SKIP_IF(htm_is_synthetic());
  83
  84         setbuf(stdout, NULL);
  85
  86         printf("Testing transactional syscalls for %d seconds...\n", TEST_DURATION);
  87
  88         gettimeofday(&end, NULL);
  89         now.tv_sec = TEST_DURATION;
  90         now.tv_usec = 0;
  91         timeradd(&end, &now, &end);
  92
  93         for (count = 0; timercmp(&now, &end, <); count++) {
  94                 /*
  95                  * Test a syscall within a suspended transaction and verify
  96                  * that it succeeds.
  97                  */
  98                 FAIL_IF(getppid_tm(false, true) == -1); /* Should succeed. */
  99
 100                 /*
 101                  * Test a syscall within an active transaction and verify that
 102                  * it fails with the correct failure code.
 103                  */
 104                 FAIL_IF(getppid_tm(false, false) != -1);  /* Should fail... */
 105                 FAIL_IF(!failure_is_persistent()); /* ...persistently... */
 106                 FAIL_IF(!failure_is_syscall());    /* ...with code syscall. */
 107
 108                 /* Now do it all again with scv if it is available. */
 109                 if (have_hwcap2(PPC_FEATURE2_SCV)) {
 110                         FAIL_IF(getppid_tm(true, true) == -1); /* Should succeed. */
 111                         FAIL_IF(getppid_tm(true, false) != -1);  /* Should fail... */
 112                         FAIL_IF(!failure_is_persistent()); /* ...persistently... */
 113                         FAIL_IF(!failure_is_syscall());    /* ...with code syscall. */
 114                 }
 115
 116                 gettimeofday(&now, 0);
 117         }
 118
 119         printf("%d active and suspended transactions behaved correctly.\n", count);
 120         printf("(There were %d transaction retries.)\n", retries);
 121
 122         return 0;
 123 }
 124
 125 int main(void)
 126 {
 127         return test_harness(tm_syscall, "tm_syscall");
 128 }