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/*
* 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) == -1)
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);
if (log2_page_size == 0)
{
err = clib_error_return_unix (0, "cannot determine page size");
goto error;
}
}
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:
*/
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