1 /*
2  * Copyright 2015, Michael Neuling, IBM Corp.
3  * Licensed under GPLv2.
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 
27 #define _GNU_SOURCE
28 #include <stdio.h>
29 #include <stdlib.h>
30 #include <unistd.h>
31 #include <pthread.h>
32 #include <string.h>
33 
34 #include "utils.h"
35 #include "tm.h"
36 
37 int	num_loops	= 10000;
38 int	passed = 1;
39 
40 void tfiar_tfhar(void *in)
41 {
42 	int i, cpu;
43 	unsigned long tfhar, tfhar_rd, tfiar, tfiar_rd;
44 	cpu_set_t cpuset;
45 
46 	CPU_ZERO(&cpuset);
47 	cpu = (unsigned long)in >> 1;
48 	CPU_SET(cpu, &cpuset);
49 	sched_setaffinity(0, sizeof(cpuset), &cpuset);
50 
51 	/* TFIAR: Last bit has to be high so userspace can read register */
52 	tfiar = ((unsigned long)in) + 1;
53 	tfiar += 2;
54 	mtspr(SPRN_TFIAR, tfiar);
55 
56 	/* TFHAR: Last two bits are reserved */
57 	tfhar = ((unsigned long)in);
58 	tfhar &= ~0x3UL;
59 	tfhar += 4;
60 	mtspr(SPRN_TFHAR, tfhar);
61 
62 	for (i = 0; i < num_loops; i++)	{
63 		tfhar_rd = mfspr(SPRN_TFHAR);
64 		tfiar_rd = mfspr(SPRN_TFIAR);
65 		if ( (tfhar != tfhar_rd) || (tfiar != tfiar_rd) ) {
66 			passed = 0;
67 			return;
68 		}
69 	}
70 	return;
71 }
72 
73 void texasr(void *in)
74 {
75 	unsigned long i;
76 	uint64_t result = 0;
77 
78 	for (i = 0; i < num_loops; i++) {
79 		asm __volatile__(
80 			"tbegin.;"
81 			"beq    3f ;"
82 			"tabort. 0 ;"
83 			"tend.;"
84 
85 			/* Abort handler */
86 			"3: ;"
87 			::: "memory");
88 
89                 /* Check the TEXASR */
90                 result = mfspr(SPRN_TEXASR);
91 		if ((result & TEXASR_FS) == 0) {
92 			passed = 0;
93 			return;
94 		}
95 	}
96 	return;
97 }
98 
99 int test_tmspr()
100 {
101 	pthread_t	*thread;
102 	int	   	thread_num;
103 	unsigned long	i;
104 
105 	SKIP_IF(!have_htm());
106 
107 	/* To cause some context switching */
108 	thread_num = 10 * sysconf(_SC_NPROCESSORS_ONLN);
109 
110 	thread = malloc(thread_num * sizeof(pthread_t));
111 	if (thread == NULL)
112 		return EXIT_FAILURE;
113 
114 	/* Test TFIAR and TFHAR */
115 	for (i = 0; i < thread_num; i += 2) {
116 		if (pthread_create(&thread[i], NULL, (void *)tfiar_tfhar,
117 				   (void *)i))
118 			return EXIT_FAILURE;
119 	}
120 	/* Test TEXASR */
121 	for (i = 1; i < thread_num; i += 2) {
122 		if (pthread_create(&thread[i], NULL, (void *)texasr, (void *)i))
123 			return EXIT_FAILURE;
124 	}
125 
126 	for (i = 0; i < thread_num; i++) {
127 		if (pthread_join(thread[i], NULL) != 0)
128 			return EXIT_FAILURE;
129 	}
130 
131 	free(thread);
132 
133 	if (passed)
134 		return 0;
135 	else
136 		return 1;
137 }
138 
139 int main(int argc, char *argv[])
140 {
141 	if (argc > 1) {
142 		if (strcmp(argv[1], "-h") == 0) {
143 			printf("Syntax:\t [<num loops>]\n");
144 			return 0;
145 		} else {
146 			num_loops = atoi(argv[1]);
147 		}
148 	}
149 	return test_harness(test_tmspr, "tm_tmspr");
150 }
151