vppinfra: add clib_mem_vm_ext_alloc function

Change-Id: Iff33694fc42cc3bcc73cf1372339053a6365039c
Signed-off-by: Damjan Marion <damarion@cisco.com>

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:
+ */