1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-only
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Copyright 2015, Sam Bobroff, IBM Corp.
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Test the kernel's system call code to ensure that a system call
6*4882a593Smuzhiyun * made from within an active HTM transaction is aborted with the
7*4882a593Smuzhiyun * correct failure code.
8*4882a593Smuzhiyun * Conversely, ensure that a system call made from within a
9*4882a593Smuzhiyun * suspended transaction can succeed.
10*4882a593Smuzhiyun */
11*4882a593Smuzhiyun
12*4882a593Smuzhiyun #include <stdio.h>
13*4882a593Smuzhiyun #include <unistd.h>
14*4882a593Smuzhiyun #include <sys/syscall.h>
15*4882a593Smuzhiyun #include <asm/tm.h>
16*4882a593Smuzhiyun #include <sys/time.h>
17*4882a593Smuzhiyun #include <stdlib.h>
18*4882a593Smuzhiyun
19*4882a593Smuzhiyun #include "utils.h"
20*4882a593Smuzhiyun #include "tm.h"
21*4882a593Smuzhiyun
22*4882a593Smuzhiyun extern int getppid_tm_active(void);
23*4882a593Smuzhiyun extern int getppid_tm_suspended(void);
24*4882a593Smuzhiyun
25*4882a593Smuzhiyun unsigned retries = 0;
26*4882a593Smuzhiyun
27*4882a593Smuzhiyun #define TEST_DURATION 10 /* seconds */
28*4882a593Smuzhiyun #define TM_RETRIES 100
29*4882a593Smuzhiyun
getppid_tm(bool suspend)30*4882a593Smuzhiyun pid_t getppid_tm(bool suspend)
31*4882a593Smuzhiyun {
32*4882a593Smuzhiyun int i;
33*4882a593Smuzhiyun pid_t pid;
34*4882a593Smuzhiyun
35*4882a593Smuzhiyun for (i = 0; i < TM_RETRIES; i++) {
36*4882a593Smuzhiyun if (suspend)
37*4882a593Smuzhiyun pid = getppid_tm_suspended();
38*4882a593Smuzhiyun else
39*4882a593Smuzhiyun pid = getppid_tm_active();
40*4882a593Smuzhiyun
41*4882a593Smuzhiyun if (pid >= 0)
42*4882a593Smuzhiyun return pid;
43*4882a593Smuzhiyun
44*4882a593Smuzhiyun if (failure_is_persistent()) {
45*4882a593Smuzhiyun if (failure_is_syscall())
46*4882a593Smuzhiyun return -1;
47*4882a593Smuzhiyun
48*4882a593Smuzhiyun printf("Unexpected persistent transaction failure.\n");
49*4882a593Smuzhiyun printf("TEXASR 0x%016lx, TFIAR 0x%016lx.\n",
50*4882a593Smuzhiyun __builtin_get_texasr(), __builtin_get_tfiar());
51*4882a593Smuzhiyun exit(-1);
52*4882a593Smuzhiyun }
53*4882a593Smuzhiyun
54*4882a593Smuzhiyun retries++;
55*4882a593Smuzhiyun }
56*4882a593Smuzhiyun
57*4882a593Smuzhiyun printf("Exceeded limit of %d temporary transaction failures.\n", TM_RETRIES);
58*4882a593Smuzhiyun printf("TEXASR 0x%016lx, TFIAR 0x%016lx.\n",
59*4882a593Smuzhiyun __builtin_get_texasr(), __builtin_get_tfiar());
60*4882a593Smuzhiyun
61*4882a593Smuzhiyun exit(-1);
62*4882a593Smuzhiyun }
63*4882a593Smuzhiyun
tm_syscall(void)64*4882a593Smuzhiyun int tm_syscall(void)
65*4882a593Smuzhiyun {
66*4882a593Smuzhiyun unsigned count = 0;
67*4882a593Smuzhiyun struct timeval end, now;
68*4882a593Smuzhiyun
69*4882a593Smuzhiyun SKIP_IF(!have_htm_nosc());
70*4882a593Smuzhiyun
71*4882a593Smuzhiyun setbuf(stdout, NULL);
72*4882a593Smuzhiyun
73*4882a593Smuzhiyun printf("Testing transactional syscalls for %d seconds...\n", TEST_DURATION);
74*4882a593Smuzhiyun
75*4882a593Smuzhiyun gettimeofday(&end, NULL);
76*4882a593Smuzhiyun now.tv_sec = TEST_DURATION;
77*4882a593Smuzhiyun now.tv_usec = 0;
78*4882a593Smuzhiyun timeradd(&end, &now, &end);
79*4882a593Smuzhiyun
80*4882a593Smuzhiyun for (count = 0; timercmp(&now, &end, <); count++) {
81*4882a593Smuzhiyun /*
82*4882a593Smuzhiyun * Test a syscall within a suspended transaction and verify
83*4882a593Smuzhiyun * that it succeeds.
84*4882a593Smuzhiyun */
85*4882a593Smuzhiyun FAIL_IF(getppid_tm(true) == -1); /* Should succeed. */
86*4882a593Smuzhiyun
87*4882a593Smuzhiyun /*
88*4882a593Smuzhiyun * Test a syscall within an active transaction and verify that
89*4882a593Smuzhiyun * it fails with the correct failure code.
90*4882a593Smuzhiyun */
91*4882a593Smuzhiyun FAIL_IF(getppid_tm(false) != -1); /* Should fail... */
92*4882a593Smuzhiyun FAIL_IF(!failure_is_persistent()); /* ...persistently... */
93*4882a593Smuzhiyun FAIL_IF(!failure_is_syscall()); /* ...with code syscall. */
94*4882a593Smuzhiyun gettimeofday(&now, 0);
95*4882a593Smuzhiyun }
96*4882a593Smuzhiyun
97*4882a593Smuzhiyun printf("%d active and suspended transactions behaved correctly.\n", count);
98*4882a593Smuzhiyun printf("(There were %d transaction retries.)\n", retries);
99*4882a593Smuzhiyun
100*4882a593Smuzhiyun return 0;
101*4882a593Smuzhiyun }
102*4882a593Smuzhiyun
main(void)103*4882a593Smuzhiyun int main(void)
104*4882a593Smuzhiyun {
105*4882a593Smuzhiyun return test_harness(tm_syscall, "tm_syscall");
106*4882a593Smuzhiyun }
107