1 #define __SANE_USERSPACE_TYPES__ // Use ll64 2 #include <fcntl.h> 3 #include <errno.h> 4 #include <stdio.h> 5 #include <stdlib.h> 6 #include <unistd.h> 7 #include <dirent.h> 8 #include <sys/ioctl.h> 9 #include <sys/mman.h> 10 #include <sys/stat.h> 11 #include <sys/types.h> 12 #include <pthread.h> 13 #include <assert.h> 14 #include <mm/gup_test.h> 15 #include "../kselftest.h" 16 #include "vm_util.h" 17 18 #define MB (1UL << 20) 19 20 /* Just the flags we need, copied from mm.h: */ 21 #define FOLL_WRITE 0x01 /* check pte is writable */ 22 #define FOLL_TOUCH 0x02 /* mark page accessed */ 23 24 #define GUP_TEST_FILE "/sys/kernel/debug/gup_test" 25 26 static unsigned long cmd = GUP_FAST_BENCHMARK; 27 static int gup_fd, repeats = 1; 28 static unsigned long size = 128 * MB; 29 /* Serialize prints */ 30 static pthread_mutex_t print_mutex = PTHREAD_MUTEX_INITIALIZER; 31 32 static char *cmd_to_str(unsigned long cmd) 33 { 34 switch (cmd) { 35 case GUP_FAST_BENCHMARK: 36 return "GUP_FAST_BENCHMARK"; 37 case PIN_FAST_BENCHMARK: 38 return "PIN_FAST_BENCHMARK"; 39 case PIN_LONGTERM_BENCHMARK: 40 return "PIN_LONGTERM_BENCHMARK"; 41 case GUP_BASIC_TEST: 42 return "GUP_BASIC_TEST"; 43 case PIN_BASIC_TEST: 44 return "PIN_BASIC_TEST"; 45 case DUMP_USER_PAGES_TEST: 46 return "DUMP_USER_PAGES_TEST"; 47 } 48 return "Unknown command"; 49 } 50 51 void *gup_thread(void *data) 52 { 53 struct gup_test gup = *(struct gup_test *)data; 54 int i, status; 55 56 /* Only report timing information on the *_BENCHMARK commands: */ 57 if ((cmd == PIN_FAST_BENCHMARK) || (cmd == GUP_FAST_BENCHMARK) || 58 (cmd == PIN_LONGTERM_BENCHMARK)) { 59 for (i = 0; i < repeats; i++) { 60 gup.size = size; 61 status = ioctl(gup_fd, cmd, &gup); 62 if (status) 63 break; 64 65 pthread_mutex_lock(&print_mutex); 66 ksft_print_msg("%s: Time: get:%lld put:%lld us", 67 cmd_to_str(cmd), gup.get_delta_usec, 68 gup.put_delta_usec); 69 if (gup.size != size) 70 ksft_print_msg(", truncated (size: %lld)", gup.size); 71 ksft_print_msg("\n"); 72 pthread_mutex_unlock(&print_mutex); 73 } 74 } else { 75 gup.size = size; 76 status = ioctl(gup_fd, cmd, &gup); 77 if (status) 78 goto return_; 79 80 pthread_mutex_lock(&print_mutex); 81 ksft_print_msg("%s: done\n", cmd_to_str(cmd)); 82 if (gup.size != size) 83 ksft_print_msg("Truncated (size: %lld)\n", gup.size); 84 pthread_mutex_unlock(&print_mutex); 85 } 86 87 return_: 88 ksft_test_result(!status, "ioctl status %d\n", status); 89 return NULL; 90 } 91 92 int main(int argc, char **argv) 93 { 94 struct gup_test gup = { 0 }; 95 int filed, i, opt, nr_pages = 1, thp = -1, write = 1, nthreads = 1, ret; 96 int flags = MAP_PRIVATE, touch = 0; 97 char *file = "/dev/zero"; 98 pthread_t *tid; 99 char *p; 100 101 while ((opt = getopt(argc, argv, "m:r:n:F:f:abcj:tTLUuwWSHpz")) != -1) { 102 switch (opt) { 103 case 'a': 104 cmd = PIN_FAST_BENCHMARK; 105 break; 106 case 'b': 107 cmd = PIN_BASIC_TEST; 108 break; 109 case 'L': 110 cmd = PIN_LONGTERM_BENCHMARK; 111 break; 112 case 'c': 113 cmd = DUMP_USER_PAGES_TEST; 114 /* 115 * Dump page 0 (index 1). May be overridden later, by 116 * user's non-option arguments. 117 * 118 * .which_pages is zero-based, so that zero can mean "do 119 * nothing". 120 */ 121 gup.which_pages[0] = 1; 122 break; 123 case 'p': 124 /* works only with DUMP_USER_PAGES_TEST */ 125 gup.test_flags |= GUP_TEST_FLAG_DUMP_PAGES_USE_PIN; 126 break; 127 case 'F': 128 /* strtol, so you can pass flags in hex form */ 129 gup.gup_flags = strtol(optarg, 0, 0); 130 break; 131 case 'j': 132 nthreads = atoi(optarg); 133 break; 134 case 'm': 135 size = atoi(optarg) * MB; 136 break; 137 case 'r': 138 repeats = atoi(optarg); 139 break; 140 case 'n': 141 nr_pages = atoi(optarg); 142 break; 143 case 't': 144 thp = 1; 145 break; 146 case 'T': 147 thp = 0; 148 break; 149 case 'U': 150 cmd = GUP_BASIC_TEST; 151 break; 152 case 'u': 153 cmd = GUP_FAST_BENCHMARK; 154 break; 155 case 'w': 156 write = 1; 157 break; 158 case 'W': 159 write = 0; 160 break; 161 case 'f': 162 file = optarg; 163 break; 164 case 'S': 165 flags &= ~MAP_PRIVATE; 166 flags |= MAP_SHARED; 167 break; 168 case 'H': 169 flags |= (MAP_HUGETLB | MAP_ANONYMOUS); 170 break; 171 case 'z': 172 /* fault pages in gup, do not fault in userland */ 173 touch = 1; 174 break; 175 default: 176 ksft_exit_fail_msg("Wrong argument\n"); 177 } 178 } 179 180 if (optind < argc) { 181 int extra_arg_count = 0; 182 /* 183 * For example: 184 * 185 * ./gup_test -c 0 1 0x1001 186 * 187 * ...to dump pages 0, 1, and 4097 188 */ 189 190 while ((optind < argc) && 191 (extra_arg_count < GUP_TEST_MAX_PAGES_TO_DUMP)) { 192 /* 193 * Do the 1-based indexing here, so that the user can 194 * use normal 0-based indexing on the command line. 195 */ 196 long page_index = strtol(argv[optind], 0, 0) + 1; 197 198 gup.which_pages[extra_arg_count] = page_index; 199 extra_arg_count++; 200 optind++; 201 } 202 } 203 204 ksft_print_header(); 205 ksft_set_plan(nthreads); 206 207 filed = open(file, O_RDWR|O_CREAT, 0664); 208 if (filed < 0) 209 ksft_exit_fail_msg("Unable to open %s: %s\n", file, strerror(errno)); 210 211 gup.nr_pages_per_call = nr_pages; 212 if (write) 213 gup.gup_flags |= FOLL_WRITE; 214 215 gup_fd = open(GUP_TEST_FILE, O_RDWR); 216 if (gup_fd == -1) { 217 switch (errno) { 218 case EACCES: 219 if (getuid()) 220 ksft_print_msg("Please run this test as root\n"); 221 break; 222 case ENOENT: 223 if (opendir("/sys/kernel/debug") == NULL) 224 ksft_print_msg("mount debugfs at /sys/kernel/debug\n"); 225 ksft_print_msg("check if CONFIG_GUP_TEST is enabled in kernel config\n"); 226 break; 227 default: 228 ksft_print_msg("failed to open %s: %s\n", GUP_TEST_FILE, strerror(errno)); 229 break; 230 } 231 ksft_test_result_skip("Please run this test as root\n"); 232 ksft_exit_pass(); 233 } 234 235 p = mmap(NULL, size, PROT_READ | PROT_WRITE, flags, filed, 0); 236 if (p == MAP_FAILED) 237 ksft_exit_fail_msg("mmap: %s\n", strerror(errno)); 238 gup.addr = (unsigned long)p; 239 240 if (thp == 1) 241 madvise(p, size, MADV_HUGEPAGE); 242 else if (thp == 0) 243 madvise(p, size, MADV_NOHUGEPAGE); 244 245 /* 246 * FOLL_TOUCH, in gup_test, is used as an either/or case: either 247 * fault pages in from the kernel via FOLL_TOUCH, or fault them 248 * in here, from user space. This allows comparison of performance 249 * between those two cases. 250 */ 251 if (touch) { 252 gup.gup_flags |= FOLL_TOUCH; 253 } else { 254 for (; (unsigned long)p < gup.addr + size; p += psize()) 255 p[0] = 0; 256 } 257 258 tid = malloc(sizeof(pthread_t) * nthreads); 259 assert(tid); 260 for (i = 0; i < nthreads; i++) { 261 ret = pthread_create(&tid[i], NULL, gup_thread, &gup); 262 assert(ret == 0); 263 } 264 for (i = 0; i < nthreads; i++) { 265 ret = pthread_join(tid[i], NULL); 266 assert(ret == 0); 267 } 268 269 free(tid); 270 271 ksft_exit_pass(); 272 } 273