1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright 2015, Sam Bobroff, IBM Corp.
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
22#ifndef PPC_FEATURE2_SCV
23#define PPC_FEATURE2_SCV               0x00100000 /* scv syscall */
24#endif
25
26extern int getppid_tm_active(void);
27extern int getppid_tm_suspended(void);
28extern int getppid_scv_tm_active(void);
29extern int getppid_scv_tm_suspended(void);
30
31unsigned retries = 0;
32
33#define TEST_DURATION 10 /* seconds */
34
35pid_t getppid_tm(bool scv, bool suspend)
36{
37	int i;
38	pid_t pid;
39
40	for (i = 0; i < TM_RETRIES; i++) {
41		if (suspend) {
42			if (scv)
43				pid = getppid_scv_tm_suspended();
44			else
45				pid = getppid_tm_suspended();
46		} else {
47			if (scv)
48				pid = getppid_scv_tm_active();
49			else
50				pid = getppid_tm_active();
51		}
52
53		if (pid >= 0)
54			return pid;
55
56		if (failure_is_persistent()) {
57			if (failure_is_syscall())
58				return -1;
59
60			printf("Unexpected persistent transaction failure.\n");
61			printf("TEXASR 0x%016lx, TFIAR 0x%016lx.\n",
62			       __builtin_get_texasr(), __builtin_get_tfiar());
63			exit(-1);
64		}
65
66		retries++;
67	}
68
69	printf("Exceeded limit of %d temporary transaction failures.\n", TM_RETRIES);
70	printf("TEXASR 0x%016lx, TFIAR 0x%016lx.\n",
71	       __builtin_get_texasr(), __builtin_get_tfiar());
72
73	exit(-1);
74}
75
76int tm_syscall(void)
77{
78	unsigned count = 0;
79	struct timeval end, now;
80
81	SKIP_IF(!have_htm_nosc());
82	SKIP_IF(htm_is_synthetic());
83
84	setbuf(stdout, NULL);
85
86	printf("Testing transactional syscalls for %d seconds...\n", TEST_DURATION);
87
88	gettimeofday(&end, NULL);
89	now.tv_sec = TEST_DURATION;
90	now.tv_usec = 0;
91	timeradd(&end, &now, &end);
92
93	for (count = 0; timercmp(&now, &end, <); count++) {
94		/*
95		 * Test a syscall within a suspended transaction and verify
96		 * that it succeeds.
97		 */
98		FAIL_IF(getppid_tm(false, true) == -1); /* Should succeed. */
99
100		/*
101		 * Test a syscall within an active transaction and verify that
102		 * it fails with the correct failure code.
103		 */
104		FAIL_IF(getppid_tm(false, false) != -1);  /* Should fail... */
105		FAIL_IF(!failure_is_persistent()); /* ...persistently... */
106		FAIL_IF(!failure_is_syscall());    /* ...with code syscall. */
107
108		/* Now do it all again with scv if it is available. */
109		if (have_hwcap2(PPC_FEATURE2_SCV)) {
110			FAIL_IF(getppid_tm(true, true) == -1); /* Should succeed. */
111			FAIL_IF(getppid_tm(true, false) != -1);  /* Should fail... */
112			FAIL_IF(!failure_is_persistent()); /* ...persistently... */
113			FAIL_IF(!failure_is_syscall());    /* ...with code syscall. */
114		}
115
116		gettimeofday(&now, 0);
117	}
118
119	printf("%d active and suspended transactions behaved correctly.\n", count);
120	printf("(There were %d transaction retries.)\n", retries);
121
122	return 0;
123}
124
125int main(void)
126{
127	return test_harness(tm_syscall, "tm_syscall");
128}
129