1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright 2015, Michael Neuling, IBM Corp. 4 * Original: Michael Neuling 19/7/2013 5 * Edited: Rashmica Gupta 01/12/2015 6 * 7 * Do some transactions, see if the tar is corrupted. 8 * If the transaction is aborted, the TAR should be rolled back to the 9 * checkpointed value before the transaction began. The value written to 10 * TAR in suspended mode should only remain in TAR if the transaction 11 * completes. 12 */ 13 14 #include <stdio.h> 15 #include <stdlib.h> 16 #include <unistd.h> 17 #include <string.h> 18 19 #include "tm.h" 20 #include "utils.h" 21 22 int num_loops = 10000; 23 24 int test_tar(void) 25 { 26 int i; 27 28 SKIP_IF(!have_htm()); 29 SKIP_IF(htm_is_synthetic()); 30 SKIP_IF(!is_ppc64le()); 31 32 for (i = 0; i < num_loops; i++) 33 { 34 uint64_t result = 0; 35 asm __volatile__( 36 "li 7, 1;" 37 "mtspr %[tar], 7;" /* tar = 1 */ 38 "tbegin.;" 39 "beq 3f;" 40 "li 4, 0x7000;" /* Loop lots, to use time */ 41 "2:;" /* Start loop */ 42 "li 7, 2;" 43 "mtspr %[tar], 7;" /* tar = 2 */ 44 "tsuspend.;" 45 "li 7, 3;" 46 "mtspr %[tar], 7;" /* tar = 3 */ 47 "tresume.;" 48 "subi 4, 4, 1;" 49 "cmpdi 4, 0;" 50 "bne 2b;" 51 "tend.;" 52 53 /* Transaction sucess! TAR should be 3 */ 54 "mfspr 7, %[tar];" 55 "ori %[res], 7, 4;" // res = 3|4 = 7 56 "b 4f;" 57 58 /* Abort handler. TAR should be rolled back to 1 */ 59 "3:;" 60 "mfspr 7, %[tar];" 61 "ori %[res], 7, 8;" // res = 1|8 = 9 62 "4:;" 63 64 : [res]"=r"(result) 65 : [tar]"i"(SPRN_TAR) 66 : "memory", "r0", "r4", "r7"); 67 68 /* If result is anything else other than 7 or 9, the tar 69 * value must have been corrupted. */ 70 if ((result != 7) && (result != 9)) 71 return 1; 72 } 73 return 0; 74 } 75 76 int main(int argc, char *argv[]) 77 { 78 /* A low number of iterations (eg 100) can cause a false pass */ 79 if (argc > 1) { 80 if (strcmp(argv[1], "-h") == 0) { 81 printf("Syntax:\n\t%s [<num loops>]\n", 82 argv[0]); 83 return 1; 84 } else { 85 num_loops = atoi(argv[1]); 86 } 87 } 88 89 printf("Starting, %d loops\n", num_loops); 90 91 return test_harness(test_tar, "tm_tar"); 92 } 93