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 }
129
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