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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	= 10000;
37 int	passed = 1;
38 
tfiar_tfhar(void * in)39 void tfiar_tfhar(void *in)
40 {
41 	int i, cpu;
42 	unsigned long tfhar, tfhar_rd, tfiar, tfiar_rd;
43 	cpu_set_t cpuset;
44 
45 	CPU_ZERO(&cpuset);
46 	cpu = (unsigned long)in >> 1;
47 	CPU_SET(cpu, &cpuset);
48 	sched_setaffinity(0, sizeof(cpuset), &cpuset);
49 
50 	/* TFIAR: Last bit has to be high so userspace can read register */
51 	tfiar = ((unsigned long)in) + 1;
52 	tfiar += 2;
53 	mtspr(SPRN_TFIAR, tfiar);
54 
55 	/* TFHAR: Last two bits are reserved */
56 	tfhar = ((unsigned long)in);
57 	tfhar &= ~0x3UL;
58 	tfhar += 4;
59 	mtspr(SPRN_TFHAR, tfhar);
60 
61 	for (i = 0; i < num_loops; i++)	{
62 		tfhar_rd = mfspr(SPRN_TFHAR);
63 		tfiar_rd = mfspr(SPRN_TFIAR);
64 		if ( (tfhar != tfhar_rd) || (tfiar != tfiar_rd) ) {
65 			passed = 0;
66 			return;
67 		}
68 	}
69 	return;
70 }
71 
texasr(void * in)72 void texasr(void *in)
73 {
74 	unsigned long i;
75 	uint64_t result = 0;
76 
77 	for (i = 0; i < num_loops; i++) {
78 		asm __volatile__(
79 			"tbegin.;"
80 			"beq    3f ;"
81 			"tabort. 0 ;"
82 			"tend.;"
83 
84 			/* Abort handler */
85 			"3: ;"
86 			::: "memory");
87 
88                 /* Check the TEXASR */
89                 result = mfspr(SPRN_TEXASR);
90 		if ((result & TEXASR_FS) == 0) {
91 			passed = 0;
92 			return;
93 		}
94 	}
95 	return;
96 }
97 
test_tmspr()98 int test_tmspr()
99 {
100 	pthread_t	*thread;
101 	int	   	thread_num;
102 	unsigned long	i;
103 
104 	SKIP_IF(!have_htm());
105 
106 	/* To cause some context switching */
107 	thread_num = 10 * sysconf(_SC_NPROCESSORS_ONLN);
108 
109 	thread = malloc(thread_num * sizeof(pthread_t));
110 	if (thread == NULL)
111 		return EXIT_FAILURE;
112 
113 	/* Test TFIAR and TFHAR */
114 	for (i = 0; i < thread_num; i += 2) {
115 		if (pthread_create(&thread[i], NULL, (void *)tfiar_tfhar,
116 				   (void *)i))
117 			return EXIT_FAILURE;
118 	}
119 	/* Test TEXASR */
120 	for (i = 1; i < thread_num; i += 2) {
121 		if (pthread_create(&thread[i], NULL, (void *)texasr, (void *)i))
122 			return EXIT_FAILURE;
123 	}
124 
125 	for (i = 0; i < thread_num; i++) {
126 		if (pthread_join(thread[i], NULL) != 0)
127 			return EXIT_FAILURE;
128 	}
129 
130 	free(thread);
131 
132 	if (passed)
133 		return 0;
134 	else
135 		return 1;
136 }
137 
main(int argc,char * argv[])138 int main(int argc, char *argv[])
139 {
140 	if (argc > 1) {
141 		if (strcmp(argv[1], "-h") == 0) {
142 			printf("Syntax:\t [<num loops>]\n");
143 			return 0;
144 		} else {
145 			num_loops = atoi(argv[1]);
146 		}
147 	}
148 	return test_harness(test_tmspr, "tm_tmspr");
149 }
150