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";
94 if (memfd_hugetlb_supported)
96 if ((fd = memfd_create (name, MFD_HUGETLB)) != -1)
99 /* avoid further tries if memfd MFD_HUGETLB is not supported */
100 if (errno == EINVAL && strnlen (name, 256) <= 249)
101 memfd_hugetlb_supported = 0;
104 mount_dir = mkdtemp (template);
106 return clib_error_return_unix (0, "mkdtemp \'%s\'", template);
108 if (mount ("none", (char *) mount_dir, "hugetlbfs", 0, NULL))
110 rmdir ((char *) mount_dir);
111 err = clib_error_return_unix (0, "mount hugetlb directory '%s'",
115 filename = format (0, "%s/%s%c", mount_dir, name, 0);
116 fd = open ((char *) filename, O_CREAT | O_RDWR, 0755);
117 umount2 ((char *) mount_dir, MNT_DETACH);
118 rmdir ((char *) mount_dir);
121 err = clib_error_return_unix (0, "open");
130 clib_mem_vm_ext_alloc (clib_mem_vm_alloc_t * a)
133 clib_error_t *err = 0;
140 long unsigned int old_mask[16] = { 0 };
142 /* save old numa mem policy if needed */
143 if (a->flags & (CLIB_MEM_VM_F_NUMA_PREFER | CLIB_MEM_VM_F_NUMA_FORCE))
146 rv = get_mempolicy (&old_mpol, old_mask, sizeof (old_mask) * 8 + 1,
151 if (a->numa_node != 0 && (a->flags & CLIB_MEM_VM_F_NUMA_FORCE) != 0)
153 err = clib_error_return_unix (0, "get_mempolicy");
161 if (a->flags & CLIB_MEM_VM_F_LOCKED)
162 mmap_flags |= MAP_LOCKED;
164 /* if we are creating shared segment, we need file descriptor */
165 if (a->flags & CLIB_MEM_VM_F_SHARED)
167 mmap_flags |= MAP_SHARED;
168 /* if hugepages are needed we need to create mount point */
169 if (a->flags & CLIB_MEM_VM_F_HUGETLB)
171 if ((err = clib_mem_create_hugetlb_fd (a->name, &fd)))
174 mmap_flags |= MAP_LOCKED;
178 if ((fd = memfd_create (a->name, MFD_ALLOW_SEALING)) == -1)
180 err = clib_error_return_unix (0, "memfd_create");
184 if ((fcntl (fd, F_ADD_SEALS, F_SEAL_SHRINK)) == -1)
186 err = clib_error_return_unix (0, "fcntl (F_ADD_SEALS)");
191 log2_page_size = clib_mem_vm_get_log2_page_size (fd);
192 if (log2_page_size == 0)
194 err = clib_error_return_unix (0, "cannot determine page size");
200 clib_mem_vm_randomize_va (&a->requested_va, log2_page_size);
201 mmap_flags |= MAP_FIXED;
204 else /* not CLIB_MEM_VM_F_SHARED */
206 mmap_flags |= MAP_PRIVATE | MAP_ANONYMOUS;
207 if (a->flags & CLIB_MEM_VM_F_HUGETLB)
209 mmap_flags |= MAP_HUGETLB;
214 log2_page_size = min_log2 (sysconf (_SC_PAGESIZE));
218 n_pages = ((a->size - 1) >> log2_page_size) + 1;
220 if (a->flags & CLIB_MEM_VM_F_HUGETLB_PREALLOC)
222 err = clib_sysfs_prealloc_hugepages (a->numa_node,
223 1 << (log2_page_size - 10),
231 if ((ftruncate (fd, (u64) n_pages * (1 << log2_page_size))) == -1)
233 err = clib_error_return_unix (0, "ftruncate");
240 long unsigned int mask[16] = { 0 };
241 mask[0] = 1 << a->numa_node;
242 rv = set_mempolicy (MPOL_BIND, mask, sizeof (mask) * 8 + 1);
243 if (rv == -1 && a->numa_node != 0 &&
244 (a->flags & CLIB_MEM_VM_F_NUMA_FORCE) != 0)
246 err = clib_error_return_unix (0, "set_mempolicy");
251 addr = mmap (uword_to_pointer (a->requested_va, void *), a->size,
252 (PROT_READ | PROT_WRITE), mmap_flags, fd, 0);
253 if (addr == MAP_FAILED)
255 err = clib_error_return_unix (0, "mmap");
259 /* re-apply old numa memory policy */
260 if (old_mpol != -1 &&
261 set_mempolicy (old_mpol, old_mask, sizeof (old_mask) * 8 + 1) == -1)
263 err = clib_error_return_unix (0, "set_mempolicy");
267 a->log2_page_size = log2_page_size;
268 a->n_pages = n_pages;
283 clib_mem_vm_ext_free (clib_mem_vm_alloc_t * a)
287 clib_mem_vm_free (a->addr, 1ull << a->log2_page_size);
294 clib_mem_vm_get_paddr (void *mem, int log2_page_size, int n_pages)
296 int pagesize = sysconf (_SC_PAGESIZE);
301 if ((fd = open ((char *) "/proc/self/pagemap", O_RDONLY)) == -1)
304 for (i = 0; i < n_pages; i++)
306 u64 seek, pagemap = 0;
307 uword vaddr = pointer_to_uword (mem) + (((u64) i) << log2_page_size);
308 seek = ((u64) vaddr / pagesize) * sizeof (u64);
309 if (lseek (fd, seek, SEEK_SET) != seek)
312 if (read (fd, &pagemap, sizeof (pagemap)) != (sizeof (pagemap)))
315 if ((pagemap & (1ULL << 63)) == 0)
318 pagemap &= pow2_mask (55);
319 vec_add1 (r, pagemap * pagesize);
324 if (vec_len (r) != n_pages)
333 clib_mem_vm_ext_map (clib_mem_vm_map_t * a)
335 int mmap_flags = MAP_SHARED;
339 mmap_flags |= MAP_FIXED;
341 addr = (void *) mmap (uword_to_pointer (a->requested_va, void *), a->size,
342 PROT_READ | PROT_WRITE, mmap_flags, a->fd, 0);
344 if (addr == MAP_FAILED)
345 return clib_error_return_unix (0, "mmap");
352 * fd.io coding-style-patch-verification: ON
355 * eval: (c-set-style "gnu")