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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Copyright 2015, Sam Bobroff, IBM Corp.4 *5 * Test the kernel's system call code to ensure that a system call6 * made from within an active HTM transaction is aborted with the7 * correct failure code.8 * Conversely, ensure that a system call made from within a9 * 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_SCV23#define PPC_FEATURE2_SCV 0x00100000 /* scv syscall */24#endif25 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 else45 pid = getppid_tm_suspended();46 } else {47 if (scv)48 pid = getppid_scv_tm_active();49 else50 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 verify96 * 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 that102 * 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