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 clib_mem_vm_get_page_size (int fd)
52 struct stat st = { 0 };
53 if (fstat (fd, &st) == -1)
59 clib_mem_vm_get_log2_page_size (int fd)
61 return min_log2 (clib_mem_vm_get_page_size (fd));
65 clib_mem_vm_randomize_va (uword * requested_va, u32 log2_page_size)
69 if (log2_page_size <= 12)
71 else if (log2_page_size > 12 && log2_page_size <= 16)
77 (clib_cpu_time_now () & bit_mask) * (1ull << log2_page_size);
81 #define MFD_HUGETLB 0x0004U
85 clib_mem_create_hugetlb_fd (char *name, int *fdp)
87 clib_error_t *err = 0;
89 static int memfd_hugetlb_supported = 1;
91 char template[] = "/tmp/hugepage_mount.XXXXXX";
96 if (memfd_hugetlb_supported)
98 if ((fd = memfd_create (name, MFD_HUGETLB)) != -1)
101 /* avoid further tries if memfd MFD_HUGETLB is not supported */
102 if (errno == EINVAL && strnlen (name, 256) <= 249)
103 memfd_hugetlb_supported = 0;
106 mount_dir = mkdtemp (template);
108 return clib_error_return_unix (0, "mkdtemp \'%s\'", template);
110 if (mount ("none", (char *) mount_dir, "hugetlbfs", 0, NULL))
112 rmdir ((char *) mount_dir);
113 err = clib_error_return_unix (0, "mount hugetlb directory '%s'",
117 filename = format (0, "%s/%s%c", mount_dir, name, 0);
118 fd = open ((char *) filename, O_CREAT | O_RDWR, 0755);
119 umount2 ((char *) mount_dir, MNT_DETACH);
120 rmdir ((char *) mount_dir);
123 err = clib_error_return_unix (0, "open");
132 clib_mem_vm_ext_alloc (clib_mem_vm_alloc_t * a)
135 clib_error_t *err = 0;
142 long unsigned int old_mask[16] = { 0 };
144 /* save old numa mem policy if needed */
145 if (a->flags & (CLIB_MEM_VM_F_NUMA_PREFER | CLIB_MEM_VM_F_NUMA_FORCE))
148 rv = get_mempolicy (&old_mpol, old_mask, sizeof (old_mask) * 8 + 1,
153 if (a->numa_node != 0 && (a->flags & CLIB_MEM_VM_F_NUMA_FORCE) != 0)
155 err = clib_error_return_unix (0, "get_mempolicy");
163 if (a->flags & CLIB_MEM_VM_F_LOCKED)
164 mmap_flags |= MAP_LOCKED;
166 /* if we are creating shared segment, we need file descriptor */
167 if (a->flags & CLIB_MEM_VM_F_SHARED)
169 mmap_flags |= MAP_SHARED;
170 /* if hugepages are needed we need to create mount point */
171 if (a->flags & CLIB_MEM_VM_F_HUGETLB)
173 if ((err = clib_mem_create_hugetlb_fd (a->name, &fd)))
176 mmap_flags |= MAP_LOCKED;
180 if ((fd = memfd_create (a->name, MFD_ALLOW_SEALING)) == -1)
182 err = clib_error_return_unix (0, "memfd_create");
186 if ((fcntl (fd, F_ADD_SEALS, F_SEAL_SHRINK)) == -1)
188 err = clib_error_return_unix (0, "fcntl (F_ADD_SEALS)");
193 log2_page_size = clib_mem_vm_get_log2_page_size (fd);
194 if (log2_page_size == 0)
196 err = clib_error_return_unix (0, "cannot determine page size");
202 clib_mem_vm_randomize_va (&a->requested_va, log2_page_size);
203 mmap_flags |= MAP_FIXED;
206 else /* not CLIB_MEM_VM_F_SHARED */
208 mmap_flags |= MAP_PRIVATE | MAP_ANONYMOUS;
209 if (a->flags & CLIB_MEM_VM_F_HUGETLB)
211 mmap_flags |= MAP_HUGETLB;
216 log2_page_size = min_log2 (sysconf (_SC_PAGESIZE));
220 n_pages = ((a->size - 1) >> log2_page_size) + 1;
222 if (a->flags & CLIB_MEM_VM_F_HUGETLB_PREALLOC)
224 err = clib_sysfs_prealloc_hugepages (a->numa_node, log2_page_size,
232 if ((ftruncate (fd, (u64) n_pages * (1 << log2_page_size))) == -1)
234 err = clib_error_return_unix (0, "ftruncate");
241 long unsigned int mask[16] = { 0 };
242 mask[0] = 1 << a->numa_node;
243 rv = set_mempolicy (MPOL_BIND, mask, sizeof (mask) * 8 + 1);
244 if (rv == -1 && a->numa_node != 0 &&
245 (a->flags & CLIB_MEM_VM_F_NUMA_FORCE) != 0)
247 err = clib_error_return_unix (0, "set_mempolicy");
252 addr = mmap (uword_to_pointer (a->requested_va, void *), a->size,
253 (PROT_READ | PROT_WRITE), mmap_flags, fd, 0);
254 if (addr == MAP_FAILED)
256 err = clib_error_return_unix (0, "mmap");
260 /* re-apply old numa memory policy */
261 if (old_mpol != -1 &&
262 set_mempolicy (old_mpol, old_mask, sizeof (old_mask) * 8 + 1) == -1)
264 err = clib_error_return_unix (0, "set_mempolicy");
268 a->log2_page_size = log2_page_size;
269 a->n_pages = n_pages;
284 clib_mem_vm_ext_free (clib_mem_vm_alloc_t * a)
288 clib_mem_vm_free (a->addr, 1ull << a->log2_page_size);
295 clib_mem_vm_get_paddr (void *mem, int log2_page_size, int n_pages)
297 int pagesize = sysconf (_SC_PAGESIZE);
302 if ((fd = open ((char *) "/proc/self/pagemap", O_RDONLY)) == -1)
305 for (i = 0; i < n_pages; i++)
307 u64 seek, pagemap = 0;
308 uword vaddr = pointer_to_uword (mem) + (((u64) i) << log2_page_size);
309 seek = ((u64) vaddr / pagesize) * sizeof (u64);
310 if (lseek (fd, seek, SEEK_SET) != seek)
313 if (read (fd, &pagemap, sizeof (pagemap)) != (sizeof (pagemap)))
316 if ((pagemap & (1ULL << 63)) == 0)
319 pagemap &= pow2_mask (55);
320 vec_add1 (r, pagemap * pagesize);
325 if (vec_len (r) != n_pages)
334 clib_mem_vm_ext_map (clib_mem_vm_map_t * a)
336 int mmap_flags = MAP_SHARED;
340 mmap_flags |= MAP_FIXED;
342 addr = (void *) mmap (uword_to_pointer (a->requested_va, void *), a->size,
343 PROT_READ | PROT_WRITE, mmap_flags, a->fd, 0);
345 if (addr == MAP_FAILED)
346 return clib_error_return_unix (0, "mmap");
353 * fd.io coding-style-patch-verification: ON
356 * eval: (c-set-style "gnu")