1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright 2015, Michael Neuling, IBM Corp.
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 #define _GNU_SOURCE
27 #include <stdio.h>
28 #include <stdlib.h>
29 #include <unistd.h>
30 #include <pthread.h>
31 #include <string.h>
32
33 #include "utils.h"
34 #include "tm.h"
35
36 int num_loops = 1000000;
37 int passed = 1;
38
39 void tfiar_tfhar(void *in)
40 {
41 unsigned long tfhar, tfhar_rd, tfiar, tfiar_rd;
42 int i;
43
44 /* TFIAR: Last bit has to be high so userspace can read register */
45 tfiar = ((unsigned long)in) + 1;
46 tfiar += 2;
47 mtspr(SPRN_TFIAR, tfiar);
48
49 /* TFHAR: Last two bits are reserved */
50 tfhar = ((unsigned long)in);
51 tfhar &= ~0x3UL;
52 tfhar += 4;
53 mtspr(SPRN_TFHAR, tfhar);
54
55 for (i = 0; i < num_loops; i++) {
56 tfhar_rd = mfspr(SPRN_TFHAR);
57 tfiar_rd = mfspr(SPRN_TFIAR);
58 if ( (tfhar != tfhar_rd) || (tfiar != tfiar_rd) ) {
59 passed = 0;
60 return;
61 }
62 }
63 return;
64 }
65
66 void texasr(void *in)
67 {
68 unsigned long i;
69 uint64_t result = 0;
70
71 for (i = 0; i < num_loops; i++) {
72 asm __volatile__(
73 "tbegin.;"
74 "beq 3f ;"
75 "tabort. 0 ;"
76 "tend.;"
77
78 /* Abort handler */
79 "3: ;"
80 ::: "memory");
81
82 /* Check the TEXASR */
83 result = mfspr(SPRN_TEXASR);
84 if ((result & TEXASR_FS) == 0) {
85 passed = 0;
86 return;
87 }
88 }
89 return;
90 }
91
92 int test_tmspr()
93 {
94 pthread_t *thread;
95 int thread_num;
96 unsigned long i;
97
98 SKIP_IF(!have_htm());
99 SKIP_IF(htm_is_synthetic());
100
101 /* To cause some context switching */
102 thread_num = 10 * sysconf(_SC_NPROCESSORS_ONLN);
103
104 thread = malloc(thread_num * sizeof(pthread_t));
105 if (thread == NULL)
106 return EXIT_FAILURE;
107
108 /* Test TFIAR and TFHAR */
109 for (i = 0; i < thread_num; i += 2) {
110 if (pthread_create(&thread[i], NULL, (void *)tfiar_tfhar,
111 (void *)i))
112 return EXIT_FAILURE;
113 }
114 /* Test TEXASR */
115 for (i = 1; i < thread_num; i += 2) {
116 if (pthread_create(&thread[i], NULL, (void *)texasr, (void *)i))
117 return EXIT_FAILURE;
118 }
119
120 for (i = 0; i < thread_num; i++) {
121 if (pthread_join(thread[i], NULL) != 0)
122 return EXIT_FAILURE;
123 }
124
125 free(thread);
126
127 if (passed)
128 return 0;
129 else
130 return 1;
131 }
132
133 int main(int argc, char *argv[])
134 {
135 if (argc > 1) {
136 if (strcmp(argv[1], "-h") == 0) {
137 printf("Syntax:\t [<num loops>]\n");
138 return 0;
139 } else {
140 num_loops = atoi(argv[1]);
141 }
142 }
143 return test_harness(test_tmspr, "tm_tmspr");
144 }
145
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