2 * Copyright (c) 2017 Cisco and/or its affiliates.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at:
7 * http://www.apache.org/licenses/LICENSE-2.0
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
18 #include <sys/types.h>
21 #include <sys/mount.h>
24 #include <linux/mempolicy.h>
25 #include <linux/memfd.h>
27 #include <vppinfra/clib.h>
28 #include <vppinfra/mem.h>
29 #include <vppinfra/time.h>
30 #include <vppinfra/format.h>
31 #include <vppinfra/clib_error.h>
32 #include <vppinfra/linux/syscall.h>
33 #include <vppinfra/linux/sysfs.h>
35 #ifndef F_LINUX_SPECIFIC_BASE
36 #define F_LINUX_SPECIFIC_BASE 1024
40 #define F_ADD_SEALS (F_LINUX_SPECIFIC_BASE + 9)
41 #define F_GET_SEALS (F_LINUX_SPECIFIC_BASE + 10)
43 #define F_SEAL_SEAL 0x0001 /* prevent further seals from being set */
44 #define F_SEAL_SHRINK 0x0002 /* prevent file from shrinking */
45 #define F_SEAL_GROW 0x0004 /* prevent file from growing */
46 #define F_SEAL_WRITE 0x0008 /* prevent writes */
50 #define MFD_HUGETLB 0x0004U
54 clib_mem_get_page_size (void)
56 return getpagesize ();
60 clib_mem_get_default_hugepage_size (void)
62 unformat_input_t input;
70 * If the kernel doesn't support hugepages, /proc/meminfo won't
71 * say anything about it. Use the regular page size as a default.
73 size = clib_mem_get_page_size () / 1024;
75 if ((fd = open ("/proc/meminfo", 0)) == -1)
78 unformat_init_clib_file (&input, fd);
80 while (unformat_check_input (&input) != UNFORMAT_END_OF_INPUT)
82 if (unformat (&input, "Hugepagesize:%_%u kB", &size))
85 unformat_skip_line (&input);
87 unformat_free (&input);
90 return 1024ULL * size;
93 static clib_mem_page_sz_t
94 legacy_get_log2_default_hugepage_size (void)
96 clib_mem_page_sz_t log2_page_size = CLIB_MEM_PAGE_SZ_UNKNOWN;
100 if ((fp = fopen ("/proc/meminfo", "r")) == NULL)
101 return CLIB_MEM_PAGE_SZ_UNKNOWN;
103 while (fscanf (fp, "%32s", tmp) > 0)
104 if (strncmp ("Hugepagesize:", tmp, 13) == 0)
107 if (fscanf (fp, "%u", &size) > 0)
108 log2_page_size = 10 + min_log2 (size);
113 return log2_page_size;
117 clib_mem_main_init ()
119 clib_mem_main_t *mm = &clib_mem_main;
124 if (mm->log2_page_sz != CLIB_MEM_PAGE_SZ_UNKNOWN)
127 /* system page size */
128 page_size = sysconf (_SC_PAGESIZE);
129 mm->log2_page_sz = min_log2 (page_size);
131 /* default system hugeppage size */
132 if ((fd = memfd_create ("test", MFD_HUGETLB)) != -1)
134 mm->log2_default_hugepage_sz = clib_mem_get_fd_log2_page_size (fd);
137 else /* likely kernel older than 4.14 */
138 mm->log2_default_hugepage_sz = legacy_get_log2_default_hugepage_size ();
141 va = mmap (0, page_size, PROT_READ | PROT_WRITE, MAP_PRIVATE |
142 MAP_ANONYMOUS, -1, 0);
143 if (va == MAP_FAILED)
146 if (mlock (va, page_size))
149 for (int i = 0; i < CLIB_MAX_NUMAS; i++)
152 if (move_pages (0, 1, &va, &i, &status, 0) == 0)
153 mm->numa_node_bitmap |= 1ULL << i;
157 munmap (va, page_size);
161 clib_mem_get_fd_page_size (int fd)
163 struct stat st = { 0 };
164 if (fstat (fd, &st) == -1)
166 return st.st_blksize;
170 clib_mem_get_fd_log2_page_size (int fd)
172 return min_log2 (clib_mem_get_fd_page_size (fd));
176 clib_mem_vm_randomize_va (uword * requested_va,
177 clib_mem_page_sz_t log2_page_size)
181 if (log2_page_size <= 12)
183 else if (log2_page_size > 12 && log2_page_size <= 16)
189 (clib_cpu_time_now () & bit_mask) * (1ull << log2_page_size);
193 clib_mem_create_fd (char *name, int *fdp)
199 if ((fd = memfd_create (name, MFD_ALLOW_SEALING)) == -1)
200 return clib_error_return_unix (0, "memfd_create");
202 if ((fcntl (fd, F_ADD_SEALS, F_SEAL_SHRINK)) == -1)
205 return clib_error_return_unix (0, "fcntl (F_ADD_SEALS)");
213 clib_mem_create_hugetlb_fd (char *name, int *fdp)
215 clib_error_t *err = 0;
217 static int memfd_hugetlb_supported = 1;
219 char template[] = "/tmp/hugepage_mount.XXXXXX";
224 if (memfd_hugetlb_supported)
226 if ((fd = memfd_create (name, MFD_HUGETLB)) != -1)
229 /* avoid further tries if memfd MFD_HUGETLB is not supported */
230 if (errno == EINVAL && strnlen (name, 256) <= 249)
231 memfd_hugetlb_supported = 0;
234 mount_dir = mkdtemp (template);
236 return clib_error_return_unix (0, "mkdtemp \'%s\'", template);
238 if (mount ("none", (char *) mount_dir, "hugetlbfs", 0, NULL))
240 rmdir ((char *) mount_dir);
241 err = clib_error_return_unix (0, "mount hugetlb directory '%s'",
245 filename = format (0, "%s/%s%c", mount_dir, name, 0);
246 fd = open ((char *) filename, O_CREAT | O_RDWR, 0755);
247 umount2 ((char *) mount_dir, MNT_DETACH);
248 rmdir ((char *) mount_dir);
251 err = clib_error_return_unix (0, "open");
260 clib_mem_vm_ext_alloc (clib_mem_vm_alloc_t * a)
263 clib_error_t *err = 0;
270 long unsigned int old_mask[16] = { 0 };
272 /* save old numa mem policy if needed */
273 if (a->flags & (CLIB_MEM_VM_F_NUMA_PREFER | CLIB_MEM_VM_F_NUMA_FORCE))
276 rv = get_mempolicy (&old_mpol, old_mask, sizeof (old_mask) * 8 + 1,
281 if (a->numa_node != 0 && (a->flags & CLIB_MEM_VM_F_NUMA_FORCE) != 0)
283 err = clib_error_return_unix (0, "get_mempolicy");
291 if (a->flags & CLIB_MEM_VM_F_LOCKED)
292 mmap_flags |= MAP_LOCKED;
294 /* if we are creating shared segment, we need file descriptor */
295 if (a->flags & CLIB_MEM_VM_F_SHARED)
297 mmap_flags |= MAP_SHARED;
298 /* if hugepages are needed we need to create mount point */
299 if (a->flags & CLIB_MEM_VM_F_HUGETLB)
301 if ((err = clib_mem_create_hugetlb_fd (a->name, &fd)))
304 mmap_flags |= MAP_LOCKED;
308 if ((err = clib_mem_create_fd (a->name, &fd)))
312 log2_page_size = clib_mem_get_fd_log2_page_size (fd);
313 if (log2_page_size == 0)
315 err = clib_error_return_unix (0, "cannot determine page size");
321 clib_mem_vm_randomize_va (&a->requested_va, log2_page_size);
322 mmap_flags |= MAP_FIXED;
325 else /* not CLIB_MEM_VM_F_SHARED */
327 mmap_flags |= MAP_PRIVATE | MAP_ANONYMOUS;
328 if (a->flags & CLIB_MEM_VM_F_HUGETLB)
330 mmap_flags |= MAP_HUGETLB;
335 log2_page_size = min_log2 (sysconf (_SC_PAGESIZE));
339 n_pages = ((a->size - 1) >> log2_page_size) + 1;
341 if (a->flags & CLIB_MEM_VM_F_HUGETLB_PREALLOC)
343 err = clib_sysfs_prealloc_hugepages (a->numa_node, log2_page_size,
351 if ((ftruncate (fd, (u64) n_pages * (1 << log2_page_size))) == -1)
353 err = clib_error_return_unix (0, "ftruncate");
360 long unsigned int mask[16] = { 0 };
361 mask[0] = 1 << a->numa_node;
362 rv = set_mempolicy (MPOL_BIND, mask, sizeof (mask) * 8 + 1);
363 if (rv == -1 && a->numa_node != 0 &&
364 (a->flags & CLIB_MEM_VM_F_NUMA_FORCE) != 0)
366 err = clib_error_return_unix (0, "set_mempolicy");
371 addr = mmap (uword_to_pointer (a->requested_va, void *), a->size,
372 (PROT_READ | PROT_WRITE), mmap_flags, fd, 0);
373 if (addr == MAP_FAILED)
375 err = clib_error_return_unix (0, "mmap");
379 /* re-apply old numa memory policy */
380 if (old_mpol != -1 &&
381 set_mempolicy (old_mpol, old_mask, sizeof (old_mask) * 8 + 1) == -1)
383 err = clib_error_return_unix (0, "set_mempolicy");
387 a->log2_page_size = log2_page_size;
388 a->n_pages = n_pages;
391 CLIB_MEM_UNPOISON (addr, a->size);
404 clib_mem_vm_ext_free (clib_mem_vm_alloc_t * a)
408 clib_mem_vm_free (a->addr, 1ull << a->log2_page_size);
415 clib_mem_vm_reserve (uword start, uword size, clib_mem_page_sz_t log2_page_sz)
417 uword off, pagesize = 1ULL << log2_page_sz;
418 int mmap_flags = MAP_PRIVATE | MAP_ANONYMOUS;
422 mmap_flags |= MAP_FIXED;
424 size = round_pow2 (size, pagesize);
426 p = uword_to_pointer (start, void *);
427 p = mmap (p, size + pagesize, PROT_NONE, mmap_flags, -1, 0);
432 off = round_pow2 ((uword) p, pagesize) - (uword) p;
434 /* trim start and end of reservation to be page aligned */
441 munmap (p + size, pagesize - off);
447 clib_mem_vm_get_paddr (void *mem, int log2_page_size, int n_pages)
449 int pagesize = sysconf (_SC_PAGESIZE);
454 if ((fd = open ((char *) "/proc/self/pagemap", O_RDONLY)) == -1)
457 for (i = 0; i < n_pages; i++)
459 u64 seek, pagemap = 0;
460 uword vaddr = pointer_to_uword (mem) + (((u64) i) << log2_page_size);
461 seek = ((u64) vaddr / pagesize) * sizeof (u64);
462 if (lseek (fd, seek, SEEK_SET) != seek)
465 if (read (fd, &pagemap, sizeof (pagemap)) != (sizeof (pagemap)))
468 if ((pagemap & (1ULL << 63)) == 0)
471 pagemap &= pow2_mask (55);
472 vec_add1 (r, pagemap * pagesize);
477 if (vec_len (r) != n_pages)
486 clib_mem_vm_ext_map (clib_mem_vm_map_t * a)
488 long unsigned int old_mask[16] = { 0 };
489 int mmap_flags = MAP_SHARED;
490 clib_error_t *err = 0;
497 rv = get_mempolicy (&old_mpol, old_mask, sizeof (old_mask) * 8 + 1, 0,
502 err = clib_error_return_unix (0, "get_mempolicy");
508 mmap_flags |= MAP_FIXED;
512 long unsigned int mask[16] = { 0 };
513 mask[0] = 1 << a->numa_node;
514 rv = set_mempolicy (MPOL_BIND, mask, sizeof (mask) * 8 + 1);
517 err = clib_error_return_unix (0, "set_mempolicy");
522 addr = (void *) mmap (uword_to_pointer (a->requested_va, void *), a->size,
523 PROT_READ | PROT_WRITE, mmap_flags, a->fd, 0);
525 if (addr == MAP_FAILED)
526 return clib_error_return_unix (0, "mmap");
528 /* re-apply old numa memory policy */
529 if (old_mpol != -1 &&
530 set_mempolicy (old_mpol, old_mask, sizeof (old_mask) * 8 + 1) == -1)
532 err = clib_error_return_unix (0, "set_mempolicy");
537 CLIB_MEM_UNPOISON (addr, a->size);
544 * fd.io coding-style-patch-verification: ON
547 * eval: (c-set-style "gnu")