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/format.h>
30 #include <vppinfra/clib_error.h>
31 #include <vppinfra/linux/syscall.h>
32 #include <vppinfra/linux/sysfs.h>
34 #ifndef F_LINUX_SPECIFIC_BASE
35 #define F_LINUX_SPECIFIC_BASE 1024
39 #define F_ADD_SEALS (F_LINUX_SPECIFIC_BASE + 9)
40 #define F_GET_SEALS (F_LINUX_SPECIFIC_BASE + 10)
42 #define F_SEAL_SEAL 0x0001 /* prevent further seals from being set */
43 #define F_SEAL_SHRINK 0x0002 /* prevent file from shrinking */
44 #define F_SEAL_GROW 0x0004 /* prevent file from growing */
45 #define F_SEAL_WRITE 0x0008 /* prevent writes */
49 clib_mem_vm_get_log2_page_size (int fd)
51 struct stat st = { 0 };
52 if (fstat (fd, &st) == -1)
54 return min_log2 (st.st_blksize);
58 clib_mem_vm_ext_alloc (clib_mem_vm_alloc_t * a)
61 clib_error_t *err = 0;
64 int mmap_flags = MAP_SHARED;
68 u64 old_mask[16] = { 0 };
70 /* save old numa mem policy if needed */
71 if (a->flags & (CLIB_MEM_VM_F_NUMA_PREFER | CLIB_MEM_VM_F_NUMA_FORCE))
74 rv = get_mempolicy (&old_mpol, old_mask, sizeof (old_mask) * 8 + 1,
79 if (a->numa_node != 0 && (a->flags & CLIB_MEM_VM_F_NUMA_FORCE) != 0)
81 err = clib_error_return_unix (0, "get_mempolicy");
89 /* if we are creating shared segment, we need file descriptor */
90 if (a->flags & CLIB_MEM_VM_F_SHARED)
92 /* if hugepages are needed we need to create mount point */
93 if (a->flags & CLIB_MEM_VM_F_HUGETLB)
96 char template[] = "/tmp/hugepage_mount.XXXXXX";
98 mount_dir = mkdtemp (template);
100 return clib_error_return_unix (0, "mkdtemp \'%s\'", template);
102 if (mount ("none", (char *) mount_dir, "hugetlbfs", 0, NULL))
104 err = clib_error_return_unix (0, "mount hugetlb directory '%s'",
109 filename = format (0, "%s/%s%c", mount_dir, a->name, 0);
111 if ((fd = open ((char *) filename, O_CREAT | O_RDWR, 0755)) == -1)
113 err = clib_error_return_unix (0, "open");
116 umount2 ((char *) mount_dir, MNT_DETACH);
117 rmdir ((char *) mount_dir);
118 mmap_flags |= MAP_LOCKED;
122 if ((fd = memfd_create (a->name, MFD_ALLOW_SEALING)) == -1)
124 err = clib_error_return_unix (0, "memfd_create");
128 if ((fcntl (fd, F_ADD_SEALS, F_SEAL_SHRINK)) == -1)
130 err = clib_error_return_unix (0, "fcntl (F_ADD_SEALS)");
134 log2_page_size = clib_mem_vm_get_log2_page_size (fd);
136 if (log2_page_size == 0)
138 err = clib_error_return_unix (0, "cannot determine page size");
142 else /* not CLIB_MEM_VM_F_SHARED */
144 if (a->flags & CLIB_MEM_VM_F_HUGETLB)
146 mmap_flags |= MAP_HUGETLB | MAP_PRIVATE | MAP_ANONYMOUS;
151 mmap_flags |= MAP_PRIVATE | MAP_ANONYMOUS;
152 log2_page_size = min_log2 (sysconf (_SC_PAGESIZE));
156 n_pages = ((a->size - 1) >> log2_page_size) + 1;
159 if (a->flags & CLIB_MEM_VM_F_HUGETLB_PREALLOC)
161 err = clib_sysfs_prealloc_hugepages (a->numa_node,
162 1 << (log2_page_size - 10),
170 if ((ftruncate (fd, a->size)) == -1)
172 err = clib_error_return_unix (0, "ftruncate");
179 u64 mask[16] = { 0 };
180 mask[0] = 1 << a->numa_node;
181 rv = set_mempolicy (MPOL_BIND, mask, sizeof (mask) * 8 + 1);
184 err = clib_error_return_unix (0, "set_mempolicy");
189 addr = mmap (0, a->size, (PROT_READ | PROT_WRITE), mmap_flags, fd, 0);
190 if (addr == MAP_FAILED)
192 err = clib_error_return_unix (0, "mmap");
196 /* re-apply old numa memory policy */
197 if (old_mpol != -1 &&
198 set_mempolicy (old_mpol, old_mask, sizeof (old_mask) * 8 + 1) == -1)
200 err = clib_error_return_unix (0, "set_mempolicy");
204 a->log2_page_size = log2_page_size;
205 a->n_pages = n_pages;
220 clib_mem_vm_get_paddr (void *mem, int log2_page_size, int n_pages)
222 int pagesize = sysconf (_SC_PAGESIZE);
227 if ((fd = open ((char *) "/proc/self/pagemap", O_RDONLY)) == -1)
230 for (i = 0; i < n_pages; i++)
232 u64 seek, pagemap = 0;
233 uword vaddr = pointer_to_uword (mem) + (((u64) i) << log2_page_size);
234 seek = ((u64) vaddr / pagesize) * sizeof (u64);
235 if (lseek (fd, seek, SEEK_SET) != seek)
238 if (read (fd, &pagemap, sizeof (pagemap)) != (sizeof (pagemap)))
241 if ((pagemap & (1ULL << 63)) == 0)
244 pagemap &= pow2_mask (55);
245 vec_add1 (r, pagemap * pagesize);
250 if (vec_len (r) != n_pages)
261 * fd.io coding-style-patch-verification: ON
264 * eval: (c-set-style "gnu")