1/*
2 * Copyright 2015, Sam Bobroff, IBM Corp.
3 * Licensed under GPLv2.
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
22extern int getppid_tm_active(void);
23extern int getppid_tm_suspended(void);
24
25unsigned retries = 0;
26
27#define TEST_DURATION 10 /* seconds */
28#define TM_RETRIES 100
29
30pid_t getppid_tm(bool suspend)
31{
32	int i;
33	pid_t pid;
34
35	for (i = 0; i < TM_RETRIES; i++) {
36		if (suspend)
37			pid = getppid_tm_suspended();
38		else
39			pid = getppid_tm_active();
40
41		if (pid >= 0)
42			return pid;
43
44		if (failure_is_persistent()) {
45			if (failure_is_syscall())
46				return -1;
47
48			printf("Unexpected persistent transaction failure.\n");
49			printf("TEXASR 0x%016lx, TFIAR 0x%016lx.\n",
50			       __builtin_get_texasr(), __builtin_get_tfiar());
51			exit(-1);
52		}
53
54		retries++;
55	}
56
57	printf("Exceeded limit of %d temporary transaction failures.\n", TM_RETRIES);
58	printf("TEXASR 0x%016lx, TFIAR 0x%016lx.\n",
59	       __builtin_get_texasr(), __builtin_get_tfiar());
60
61	exit(-1);
62}
63
64int tm_syscall(void)
65{
66	unsigned count = 0;
67	struct timeval end, now;
68
69	SKIP_IF(!have_htm_nosc());
70
71	setbuf(stdout, NULL);
72
73	printf("Testing transactional syscalls for %d seconds...\n", TEST_DURATION);
74
75	gettimeofday(&end, NULL);
76	now.tv_sec = TEST_DURATION;
77	now.tv_usec = 0;
78	timeradd(&end, &now, &end);
79
80	for (count = 0; timercmp(&now, &end, <); count++) {
81		/*
82		 * Test a syscall within a suspended transaction and verify
83		 * that it succeeds.
84		 */
85		FAIL_IF(getppid_tm(true) == -1); /* Should succeed. */
86
87		/*
88		 * Test a syscall within an active transaction and verify that
89		 * it fails with the correct failure code.
90		 */
91		FAIL_IF(getppid_tm(false) != -1);  /* Should fail... */
92		FAIL_IF(!failure_is_persistent()); /* ...persistently... */
93		FAIL_IF(!failure_is_syscall());    /* ...with code syscall. */
94		gettimeofday(&now, 0);
95	}
96
97	printf("%d active and suspended transactions behaved correctly.\n", count);
98	printf("(There were %d transaction retries.)\n", retries);
99
100	return 0;
101}
102
103int main(void)
104{
105	return test_harness(tm_syscall, "tm_syscall");
106}
107