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