linux/tools/testing/selftests/vm/va_128TBswitch.c
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   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 *
   4 * Authors: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
   5 * Authors: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
   6 */
   7
   8#include <stdio.h>
   9#include <sys/mman.h>
  10#include <string.h>
  11
  12#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
  13
  14#ifdef __powerpc64__
  15#define PAGE_SIZE       (64 << 10)
  16/*
  17 * This will work with 16M and 2M hugepage size
  18 */
  19#define HUGETLB_SIZE    (16 << 20)
  20#else
  21#define PAGE_SIZE       (4 << 10)
  22#define HUGETLB_SIZE    (2 << 20)
  23#endif
  24
  25/*
  26 * >= 128TB is the hint addr value we used to select
  27 * large address space.
  28 */
  29#define ADDR_SWITCH_HINT (1UL << 47)
  30#define LOW_ADDR        ((void *) (1UL << 30))
  31#define HIGH_ADDR       ((void *) (1UL << 48))
  32
  33struct testcase {
  34        void *addr;
  35        unsigned long size;
  36        unsigned long flags;
  37        const char *msg;
  38        unsigned int low_addr_required:1;
  39        unsigned int keep_mapped:1;
  40};
  41
  42static struct testcase testcases[] = {
  43        {
  44                /*
  45                 * If stack is moved, we could possibly allocate
  46                 * this at the requested address.
  47                 */
  48                .addr = ((void *)(ADDR_SWITCH_HINT - PAGE_SIZE)),
  49                .size = PAGE_SIZE,
  50                .flags = MAP_PRIVATE | MAP_ANONYMOUS,
  51                .msg = "mmap(ADDR_SWITCH_HINT - PAGE_SIZE, PAGE_SIZE)",
  52                .low_addr_required = 1,
  53        },
  54        {
  55                /*
  56                 * We should never allocate at the requested address or above it
  57                 * The len cross the 128TB boundary. Without MAP_FIXED
  58                 * we will always search in the lower address space.
  59                 */
  60                .addr = ((void *)(ADDR_SWITCH_HINT - PAGE_SIZE)),
  61                .size = 2 * PAGE_SIZE,
  62                .flags = MAP_PRIVATE | MAP_ANONYMOUS,
  63                .msg = "mmap(ADDR_SWITCH_HINT - PAGE_SIZE, (2 * PAGE_SIZE))",
  64                .low_addr_required = 1,
  65        },
  66        {
  67                /*
  68                 * Exact mapping at 128TB, the area is free we should get that
  69                 * even without MAP_FIXED.
  70                 */
  71                .addr = ((void *)(ADDR_SWITCH_HINT)),
  72                .size = PAGE_SIZE,
  73                .flags = MAP_PRIVATE | MAP_ANONYMOUS,
  74                .msg = "mmap(ADDR_SWITCH_HINT, PAGE_SIZE)",
  75                .keep_mapped = 1,
  76        },
  77        {
  78                .addr = (void *)(ADDR_SWITCH_HINT),
  79                .size = 2 * PAGE_SIZE,
  80                .flags = MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED,
  81                .msg = "mmap(ADDR_SWITCH_HINT, 2 * PAGE_SIZE, MAP_FIXED)",
  82        },
  83        {
  84                .addr = NULL,
  85                .size = 2 * PAGE_SIZE,
  86                .flags = MAP_PRIVATE | MAP_ANONYMOUS,
  87                .msg = "mmap(NULL)",
  88                .low_addr_required = 1,
  89        },
  90        {
  91                .addr = LOW_ADDR,
  92                .size = 2 * PAGE_SIZE,
  93                .flags = MAP_PRIVATE | MAP_ANONYMOUS,
  94                .msg = "mmap(LOW_ADDR)",
  95                .low_addr_required = 1,
  96        },
  97        {
  98                .addr = HIGH_ADDR,
  99                .size = 2 * PAGE_SIZE,
 100                .flags = MAP_PRIVATE | MAP_ANONYMOUS,
 101                .msg = "mmap(HIGH_ADDR)",
 102                .keep_mapped = 1,
 103        },
 104        {
 105                .addr = HIGH_ADDR,
 106                .size = 2 * PAGE_SIZE,
 107                .flags = MAP_PRIVATE | MAP_ANONYMOUS,
 108                .msg = "mmap(HIGH_ADDR) again",
 109                .keep_mapped = 1,
 110        },
 111        {
 112                .addr = HIGH_ADDR,
 113                .size = 2 * PAGE_SIZE,
 114                .flags = MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED,
 115                .msg = "mmap(HIGH_ADDR, MAP_FIXED)",
 116        },
 117        {
 118                .addr = (void *) -1,
 119                .size = 2 * PAGE_SIZE,
 120                .flags = MAP_PRIVATE | MAP_ANONYMOUS,
 121                .msg = "mmap(-1)",
 122                .keep_mapped = 1,
 123        },
 124        {
 125                .addr = (void *) -1,
 126                .size = 2 * PAGE_SIZE,
 127                .flags = MAP_PRIVATE | MAP_ANONYMOUS,
 128                .msg = "mmap(-1) again",
 129        },
 130        {
 131                .addr = ((void *)(ADDR_SWITCH_HINT - PAGE_SIZE)),
 132                .size = PAGE_SIZE,
 133                .flags = MAP_PRIVATE | MAP_ANONYMOUS,
 134                .msg = "mmap(ADDR_SWITCH_HINT - PAGE_SIZE, PAGE_SIZE)",
 135                .low_addr_required = 1,
 136        },
 137        {
 138                .addr = (void *)(ADDR_SWITCH_HINT - PAGE_SIZE),
 139                .size = 2 * PAGE_SIZE,
 140                .flags = MAP_PRIVATE | MAP_ANONYMOUS,
 141                .msg = "mmap(ADDR_SWITCH_HINT - PAGE_SIZE, 2 * PAGE_SIZE)",
 142                .low_addr_required = 1,
 143                .keep_mapped = 1,
 144        },
 145        {
 146                .addr = (void *)(ADDR_SWITCH_HINT - PAGE_SIZE / 2),
 147                .size = 2 * PAGE_SIZE,
 148                .flags = MAP_PRIVATE | MAP_ANONYMOUS,
 149                .msg = "mmap(ADDR_SWITCH_HINT - PAGE_SIZE/2 , 2 * PAGE_SIZE)",
 150                .low_addr_required = 1,
 151                .keep_mapped = 1,
 152        },
 153        {
 154                .addr = ((void *)(ADDR_SWITCH_HINT)),
 155                .size = PAGE_SIZE,
 156                .flags = MAP_PRIVATE | MAP_ANONYMOUS,
 157                .msg = "mmap(ADDR_SWITCH_HINT, PAGE_SIZE)",
 158        },
 159        {
 160                .addr = (void *)(ADDR_SWITCH_HINT),
 161                .size = 2 * PAGE_SIZE,
 162                .flags = MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED,
 163                .msg = "mmap(ADDR_SWITCH_HINT, 2 * PAGE_SIZE, MAP_FIXED)",
 164        },
 165};
 166
 167static struct testcase hugetlb_testcases[] = {
 168        {
 169                .addr = NULL,
 170                .size = HUGETLB_SIZE,
 171                .flags = MAP_HUGETLB | MAP_PRIVATE | MAP_ANONYMOUS,
 172                .msg = "mmap(NULL, MAP_HUGETLB)",
 173                .low_addr_required = 1,
 174        },
 175        {
 176                .addr = LOW_ADDR,
 177                .size = HUGETLB_SIZE,
 178                .flags = MAP_HUGETLB | MAP_PRIVATE | MAP_ANONYMOUS,
 179                .msg = "mmap(LOW_ADDR, MAP_HUGETLB)",
 180                .low_addr_required = 1,
 181        },
 182        {
 183                .addr = HIGH_ADDR,
 184                .size = HUGETLB_SIZE,
 185                .flags = MAP_HUGETLB | MAP_PRIVATE | MAP_ANONYMOUS,
 186                .msg = "mmap(HIGH_ADDR, MAP_HUGETLB)",
 187                .keep_mapped = 1,
 188        },
 189        {
 190                .addr = HIGH_ADDR,
 191                .size = HUGETLB_SIZE,
 192                .flags = MAP_HUGETLB | MAP_PRIVATE | MAP_ANONYMOUS,
 193                .msg = "mmap(HIGH_ADDR, MAP_HUGETLB) again",
 194                .keep_mapped = 1,
 195        },
 196        {
 197                .addr = HIGH_ADDR,
 198                .size = HUGETLB_SIZE,
 199                .flags = MAP_HUGETLB | MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED,
 200                .msg = "mmap(HIGH_ADDR, MAP_FIXED | MAP_HUGETLB)",
 201        },
 202        {
 203                .addr = (void *) -1,
 204                .size = HUGETLB_SIZE,
 205                .flags = MAP_HUGETLB | MAP_PRIVATE | MAP_ANONYMOUS,
 206                .msg = "mmap(-1, MAP_HUGETLB)",
 207                .keep_mapped = 1,
 208        },
 209        {
 210                .addr = (void *) -1,
 211                .size = HUGETLB_SIZE,
 212                .flags = MAP_HUGETLB | MAP_PRIVATE | MAP_ANONYMOUS,
 213                .msg = "mmap(-1, MAP_HUGETLB) again",
 214        },
 215        {
 216                .addr = (void *)(ADDR_SWITCH_HINT - PAGE_SIZE),
 217                .size = 2 * HUGETLB_SIZE,
 218                .flags = MAP_HUGETLB | MAP_PRIVATE | MAP_ANONYMOUS,
 219                .msg = "mmap(ADDR_SWITCH_HINT - PAGE_SIZE, 2*HUGETLB_SIZE, MAP_HUGETLB)",
 220                .low_addr_required = 1,
 221                .keep_mapped = 1,
 222        },
 223        {
 224                .addr = (void *)(ADDR_SWITCH_HINT),
 225                .size = 2 * HUGETLB_SIZE,
 226                .flags = MAP_HUGETLB | MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED,
 227                .msg = "mmap(ADDR_SWITCH_HINT , 2*HUGETLB_SIZE, MAP_FIXED | MAP_HUGETLB)",
 228        },
 229};
 230
 231static int run_test(struct testcase *test, int count)
 232{
 233        void *p;
 234        int i, ret = 0;
 235
 236        for (i = 0; i < count; i++) {
 237                struct testcase *t = test + i;
 238
 239                p = mmap(t->addr, t->size, PROT_READ | PROT_WRITE, t->flags, -1, 0);
 240
 241                printf("%s: %p - ", t->msg, p);
 242
 243                if (p == MAP_FAILED) {
 244                        printf("FAILED\n");
 245                        ret = 1;
 246                        continue;
 247                }
 248
 249                if (t->low_addr_required && p >= (void *)(ADDR_SWITCH_HINT)) {
 250                        printf("FAILED\n");
 251                        ret = 1;
 252                } else {
 253                        /*
 254                         * Do a dereference of the address returned so that we catch
 255                         * bugs in page fault handling
 256                         */
 257                        memset(p, 0, t->size);
 258                        printf("OK\n");
 259                }
 260                if (!t->keep_mapped)
 261                        munmap(p, t->size);
 262        }
 263
 264        return ret;
 265}
 266
 267static int supported_arch(void)
 268{
 269#if defined(__powerpc64__)
 270        return 1;
 271#elif defined(__x86_64__)
 272        return 1;
 273#else
 274        return 0;
 275#endif
 276}
 277
 278int main(int argc, char **argv)
 279{
 280        int ret;
 281
 282        if (!supported_arch())
 283                return 0;
 284
 285        ret = run_test(testcases, ARRAY_SIZE(testcases));
 286        if (argc == 2 && !strcmp(argv[1], "--run-hugetlb"))
 287                ret = run_test(hugetlb_testcases, ARRAY_SIZE(hugetlb_testcases));
 288        return ret;
 289}
 290
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