2 * Copyright 2015, Sam Bobroff, IBM Corp.
3 * Licensed under GPLv2.
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.
14 #include <sys/syscall.h>
16 #include <asm/cputable.h>
17 #include <linux/auxvec.h>
23 extern int getppid_tm_active(void);
24 extern int getppid_tm_suspended(void);
28 #define TEST_DURATION 10 /* seconds */
29 #define TM_RETRIES 100
31 long failure_code(void)
33 return __builtin_get_texasru() >> 24;
36 bool failure_is_persistent(void)
38 return (failure_code() & TM_CAUSE_PERSISTENT) == TM_CAUSE_PERSISTENT;
41 bool failure_is_syscall(void)
43 return (failure_code() & TM_CAUSE_SYSCALL) == TM_CAUSE_SYSCALL;
46 pid_t getppid_tm(bool suspend)
51 for (i = 0; i < TM_RETRIES; i++) {
53 pid = getppid_tm_suspended();
55 pid = getppid_tm_active();
60 if (failure_is_persistent()) {
61 if (failure_is_syscall())
64 printf("Unexpected persistent transaction failure.\n");
65 printf("TEXASR 0x%016lx, TFIAR 0x%016lx.\n",
66 __builtin_get_texasr(), __builtin_get_tfiar());
73 printf("Exceeded limit of %d temporary transaction failures.\n", TM_RETRIES);
74 printf("TEXASR 0x%016lx, TFIAR 0x%016lx.\n",
75 __builtin_get_texasr(), __builtin_get_tfiar());
83 struct timeval end, now;
85 SKIP_IF(!((long)get_auxv_entry(AT_HWCAP2) & PPC_FEATURE2_HTM));
88 printf("Testing transactional syscalls for %d seconds...\n", TEST_DURATION);
90 gettimeofday(&end, NULL);
91 now.tv_sec = TEST_DURATION;
93 timeradd(&end, &now, &end);
95 for (count = 0; timercmp(&now, &end, <); count++) {
97 * Test a syscall within a suspended transaction and verify
100 FAIL_IF(getppid_tm(true) == -1); /* Should succeed. */
103 * Test a syscall within an active transaction and verify that
104 * it fails with the correct failure code.
106 FAIL_IF(getppid_tm(false) != -1); /* Should fail... */
107 FAIL_IF(!failure_is_persistent()); /* ...persistently... */
108 FAIL_IF(!failure_is_syscall()); /* ...with code syscall. */
109 gettimeofday(&now, 0);
112 printf("%d active and suspended transactions behaved correctly.\n", count);
113 printf("(There were %d transaction retries.)\n", retries);
120 return test_harness(tm_syscall, "tm_syscall");