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authorDamjan Marion <damarion@cisco.com>2017-09-14 19:04:50 +0200
committerDave Barach <openvpp@barachs.net>2017-09-15 16:34:50 +0000
commit01914ce45729833cec88c65689de9a0336cd40cc (patch)
tree99068f85d2b7b4e55154706286ab629acc7e4ab6 /src/vppinfra/linux/mem.c
parentce41a5c8032ff581a56b990361a2368c879a7adf (diff)
vppinfra: add clib_mem_vm_ext_alloc function
Change-Id: Iff33694fc42cc3bcc73cf1372339053a6365039c Signed-off-by: Damjan Marion <damarion@cisco.com>
Diffstat (limited to 'src/vppinfra/linux/mem.c')
-rw-r--r--src/vppinfra/linux/mem.c260
1 files changed, 260 insertions, 0 deletions
diff --git a/src/vppinfra/linux/mem.c b/src/vppinfra/linux/mem.c
new file mode 100644
index 00000000000..665ddf6194f
--- /dev/null
+++ b/src/vppinfra/linux/mem.c
@@ -0,0 +1,260 @@
+/*
+ * Copyright (c) 2017 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define _GNU_SOURCE
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <sys/mount.h>
+#include <sys/mman.h>
+#include <fcntl.h>
+#include <linux/mempolicy.h>
+#include <linux/memfd.h>
+
+#include <vppinfra/clib.h>
+#include <vppinfra/mem.h>
+#include <vppinfra/format.h>
+#include <vppinfra/clib_error.h>
+#include <vppinfra/linux/syscall.h>
+#include <vppinfra/linux/sysfs.h>
+
+#ifndef F_LINUX_SPECIFIC_BASE
+#define F_LINUX_SPECIFIC_BASE 1024
+#endif
+
+#ifndef F_ADD_SEALS
+#define F_ADD_SEALS (F_LINUX_SPECIFIC_BASE + 9)
+#define F_GET_SEALS (F_LINUX_SPECIFIC_BASE + 10)
+
+#define F_SEAL_SEAL 0x0001 /* prevent further seals from being set */
+#define F_SEAL_SHRINK 0x0002 /* prevent file from shrinking */
+#define F_SEAL_GROW 0x0004 /* prevent file from growing */
+#define F_SEAL_WRITE 0x0008 /* prevent writes */
+#endif
+
+int
+clib_mem_vm_get_log2_page_size (int fd)
+{
+ struct stat st = { 0 };
+ if (fstat (fd, &st))
+ return 0;
+ return min_log2 (st.st_blksize);
+}
+
+clib_error_t *
+clib_mem_vm_ext_alloc (clib_mem_vm_alloc_t * a)
+{
+ int fd = -1;
+ clib_error_t *err = 0;
+ void *addr = 0;
+ u8 *filename = 0;
+ int mmap_flags = MAP_SHARED;
+ int log2_page_size;
+ int n_pages;
+ int old_mpol = -1;
+ u64 old_mask[16] = { 0 };
+
+ /* save old numa mem policy if needed */
+ if (a->flags & (CLIB_MEM_VM_F_NUMA_PREFER | CLIB_MEM_VM_F_NUMA_FORCE))
+ {
+ int rv;
+ rv =
+ get_mempolicy (&old_mpol, old_mask, sizeof (old_mask) * 8 + 1, 0, 0);
+
+ if (rv == -1)
+ {
+ if ((a->flags & CLIB_MEM_VM_F_NUMA_FORCE) != 0)
+ {
+ err = clib_error_return_unix (0, "get_mempolicy");
+ goto error;
+ }
+ else
+ old_mpol = -1;
+ }
+ }
+
+ /* if we are creating shared segment, we need file descriptor */
+ if (a->flags & CLIB_MEM_VM_F_SHARED)
+ {
+ /* if hugepages are needed we need to create mount point */
+ if (a->flags & CLIB_MEM_VM_F_HUGETLB)
+ {
+ char *mount_dir;
+ char template[] = "/tmp/hugepage_mount.XXXXXX";
+
+ mount_dir = mkdtemp (template);
+ if (mount_dir == 0)
+ return clib_error_return_unix (0, "mkdtemp \'%s\'", template);
+
+ if (mount ("none", (char *) mount_dir, "hugetlbfs", 0, NULL))
+ {
+ err = clib_error_return_unix (0, "mount hugetlb directory '%s'",
+ mount_dir);
+ goto error;
+ }
+
+ filename = format (0, "%s/%s%c", mount_dir, a->name, 0);
+
+ if ((fd = open ((char *) filename, O_CREAT | O_RDWR, 0755)) == -1)
+ {
+ err = clib_error_return_unix (0, "open");
+ goto error;
+ }
+ umount2 ((char *) mount_dir, MNT_DETACH);
+ rmdir ((char *) mount_dir);
+ mmap_flags |= MAP_LOCKED;
+ }
+ else
+ {
+ if ((fd = memfd_create (a->name, MFD_ALLOW_SEALING)) == -1)
+ {
+ err = clib_error_return_unix (0, "memfd_create");
+ goto error;
+ }
+
+ if ((fcntl (fd, F_ADD_SEALS, F_SEAL_SHRINK)) == -1)
+ {
+ err = clib_error_return_unix (0, "fcntl (F_ADD_SEALS)");
+ goto error;
+ }
+ }
+ log2_page_size = clib_mem_vm_get_log2_page_size (fd);
+ }
+ else /* not CLIB_MEM_VM_F_SHARED */
+ {
+ if (a->flags & CLIB_MEM_VM_F_HUGETLB)
+ {
+ mmap_flags |= MAP_HUGETLB | MAP_PRIVATE | MAP_ANONYMOUS;
+ log2_page_size = 21;
+ }
+ else
+ {
+ mmap_flags |= MAP_PRIVATE | MAP_ANONYMOUS;
+ log2_page_size = min_log2 (sysconf (_SC_PAGESIZE));
+ }
+ }
+
+ n_pages = ((a->size - 1) >> log2_page_size) + 1;
+
+
+ if (a->flags & CLIB_MEM_VM_F_HUGETLB_PREALLOC)
+ {
+ err = clib_sysfs_prealloc_hugepages (a->numa_node,
+ 1 << (log2_page_size - 10),
+ n_pages);
+ if (err)
+ goto error;
+
+ }
+
+ if (fd != -1)
+ if ((ftruncate (fd, a->size)) == -1)
+ {
+ err = clib_error_return_unix (0, "ftruncate");
+ goto error;
+ }
+
+ if (old_mpol != -1)
+ {
+ int rv;
+ u64 mask[16] = { 0 };
+ mask[0] = 1 << a->numa_node;
+ rv = set_mempolicy (MPOL_BIND, mask, sizeof (mask) * 8 + 1);
+ if (rv)
+ {
+ err = clib_error_return_unix (0, "set_mempolicy");
+ goto error;
+ }
+ }
+
+ addr = mmap (0, a->size, (PROT_READ | PROT_WRITE), mmap_flags, fd, 0);
+ if (addr == MAP_FAILED)
+ {
+ err = clib_error_return_unix (0, "mmap");
+ goto error;
+ }
+
+ /* re-apply ole numa memory policy */
+ if (old_mpol != -1 &&
+ set_mempolicy (old_mpol, old_mask, sizeof (old_mask) * 8 + 1) == -1)
+ {
+ err = clib_error_return_unix (0, "set_mempolicy");
+ goto error;
+ }
+
+ a->log2_page_size = log2_page_size;
+ a->n_pages = n_pages;
+ a->addr = addr;
+ a->fd = fd;
+ goto done;
+
+error:
+ if (fd != -1)
+ close (fd);
+
+done:
+ vec_free (filename);
+ return err;
+}
+
+u64 *
+clib_mem_vm_get_paddr (void *mem, int log2_page_size, int n_pages)
+{
+ int pagesize = sysconf (_SC_PAGESIZE);
+ int fd;
+ int i;
+ u64 *r = 0;
+
+ if ((fd = open ((char *) "/proc/self/pagemap", O_RDONLY)) == -1)
+ return 0;
+
+ for (i = 0; i < n_pages; i++)
+ {
+ u64 seek, pagemap = 0;
+ uword vaddr = pointer_to_uword (mem) + (((u64) i) << log2_page_size);
+ seek = ((u64) vaddr / pagesize) * sizeof (u64);
+ if (lseek (fd, seek, SEEK_SET) != seek)
+ goto done;
+
+ if (read (fd, &pagemap, sizeof (pagemap)) != (sizeof (pagemap)))
+ goto done;
+
+ if ((pagemap & (1ULL << 63)) == 0)
+ goto done;
+
+ pagemap &= pow2_mask (55);
+ vec_add1 (r, pagemap * pagesize);
+ }
+
+done:
+ close (fd);
+ if (vec_len (r) != n_pages)
+ {
+ vec_free (r);
+ return 0;
+ }
+ return r;
+}
+
+
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */