mem.h

Go to the documentation of this file.

/*
 * Copyright (c) 2015 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.
 */
/*
  Copyright (c) 2001, 2002, 2003 Eliot Dresselhaus

  Permission is hereby granted, free of charge, to any person obtaining
  a copy of this software and associated documentation files (the
  "Software"), to deal in the Software without restriction, including
  without limitation the rights to use, copy, modify, merge, publish,
  distribute, sublicense, and/or sell copies of the Software, and to
  permit persons to whom the Software is furnished to do so, subject to
  the following conditions:

  The above copyright notice and this permission notice shall be
  included in all copies or substantial portions of the Software.

  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/

#ifndef _included_clib_mem_h
#define _included_clib_mem_h

#include <stdarg.h>
#include <unistd.h>
#include <sys/mman.h>

#include <vppinfra/clib.h>      /* uword, etc */
#include <vppinfra/clib_error.h>

#if USE_DLMALLOC == 0
#include <vppinfra/mheap_bootstrap.h>
#else
#include <vppinfra/dlmalloc.h>
#endif

#include <vppinfra/os.h>
#include <vppinfra/string.h>    /* memcpy, memset */
#include <vppinfra/valgrind.h>

#define CLIB_MAX_MHEAPS 256

/* Per CPU heaps. */
extern void *clib_per_cpu_mheaps[CLIB_MAX_MHEAPS];

always_inline void *
clib_mem_get_per_cpu_heap (void)
{
  int cpu = os_get_thread_index ();
  return clib_per_cpu_mheaps[cpu];
}

always_inline void *
clib_mem_set_per_cpu_heap (u8 * new_heap)
{
  int cpu = os_get_thread_index ();
  void *old = clib_per_cpu_mheaps[cpu];
  clib_per_cpu_mheaps[cpu] = new_heap;
  return old;
}

/* Memory allocator which may call os_out_of_memory() if it fails */
always_inline void *
clib_mem_alloc_aligned_at_offset (uword size, uword align, uword align_offset,
                                  int os_out_of_memory_on_failure)
{
  void *heap, *p;
  uword cpu;

  if (align_offset > align)
    {
      if (align > 0)
        align_offset %= align;
      else
        align_offset = align;
    }

  cpu = os_get_thread_index ();
  heap = clib_per_cpu_mheaps[cpu];

#if USE_DLMALLOC == 0
  uword offset;
  heap = mheap_get_aligned (heap, size, align, align_offset, &offset);
  clib_per_cpu_mheaps[cpu] = heap;

  if (offset != ~0)
    {
      p = heap + offset;
#if CLIB_DEBUG > 0
      VALGRIND_MALLOCLIKE_BLOCK (p, mheap_data_bytes (heap, offset), 0, 0);
#endif
      return p;
    }
  else
    {
      if (os_out_of_memory_on_failure)
        os_out_of_memory ();
      return 0;
    }
#else
  p = mspace_get_aligned (heap, size, align, align_offset);
  if (PREDICT_FALSE (p == 0))
    {
      if (os_out_of_memory_on_failure)
        os_out_of_memory ();
      return 0;
    }

  return p;
#endif /* USE_DLMALLOC */
}

/* Memory allocator which calls os_out_of_memory() when it fails */
always_inline void *
clib_mem_alloc (uword size)
{
  return clib_mem_alloc_aligned_at_offset (size, /* align */ 1,
                                           /* align_offset */ 0,
                                           /* os_out_of_memory */ 1);
}

always_inline void *
clib_mem_alloc_aligned (uword size, uword align)
{
  return clib_mem_alloc_aligned_at_offset (size, align, /* align_offset */ 0,
                                           /* os_out_of_memory */ 1);
}

/* Memory allocator which calls os_out_of_memory() when it fails */
always_inline void *
clib_mem_alloc_or_null (uword size)
{
  return clib_mem_alloc_aligned_at_offset (size, /* align */ 1,
                                           /* align_offset */ 0,
                                           /* os_out_of_memory */ 0);
}

always_inline void *
clib_mem_alloc_aligned_or_null (uword size, uword align)
{
  return clib_mem_alloc_aligned_at_offset (size, align, /* align_offset */ 0,
                                           /* os_out_of_memory */ 0);
}



/* Memory allocator which panics when it fails.
   Use macro so that clib_panic macro can expand __FUNCTION__ and __LINE__. */
#define clib_mem_alloc_aligned_no_fail(size,align)                              \
({                                                                              \
  uword _clib_mem_alloc_size = (size);                                          \
  void * _clib_mem_alloc_p;                                                     \
  _clib_mem_alloc_p = clib_mem_alloc_aligned (_clib_mem_alloc_size, (align));   \
  if (! _clib_mem_alloc_p)                                                      \
    clib_panic ("failed to allocate %d bytes", _clib_mem_alloc_size);           \
  _clib_mem_alloc_p;                                                            \
})

#define clib_mem_alloc_no_fail(size) clib_mem_alloc_aligned_no_fail(size,1)

/* Alias to stack allocator for naming consistency. */
#define clib_mem_alloc_stack(bytes) __builtin_alloca(bytes)

always_inline uword
clib_mem_is_heap_object (void *p)
{
#if USE_DLMALLOC == 0
  void *heap = clib_mem_get_per_cpu_heap ();
  uword offset = (uword) p - (uword) heap;
  mheap_elt_t *e, *n;

  if (offset >= vec_len (heap))
    return 0;

  e = mheap_elt_at_uoffset (heap, offset);
  n = mheap_next_elt (e);

  /* Check that heap forward and reverse pointers agree. */
  return e->n_user_data == n->prev_n_user_data;
#else
  void *heap = clib_mem_get_per_cpu_heap ();

  return mspace_is_heap_object (heap, p);
#endif /* USE_DLMALLOC */
}

always_inline void
clib_mem_free (void *p)
{
  u8 *heap = clib_mem_get_per_cpu_heap ();

  /* Make sure object is in the correct heap. */
  ASSERT (clib_mem_is_heap_object (p));

#if USE_DLMALLOC == 0
  mheap_put (heap, (u8 *) p - heap);
#else
  mspace_put (heap, p);
#endif

#if CLIB_DEBUG > 0
  VALGRIND_FREELIKE_BLOCK (p, 0);
#endif
}

always_inline void *
clib_mem_realloc (void *p, uword new_size, uword old_size)
{
  /* By default use alloc, copy and free to emulate realloc. */
  void *q = clib_mem_alloc (new_size);
  if (q)
    {
      uword copy_size;
      if (old_size < new_size)
        copy_size = old_size;
      else
        copy_size = new_size;
      clib_memcpy (q, p, copy_size);
      clib_mem_free (p);
    }
  return q;
}

always_inline uword
clib_mem_size (void *p)
{
#if USE_DLMALLOC == 0
  mheap_elt_t *e = mheap_user_pointer_to_elt (p);
  ASSERT (clib_mem_is_heap_object (p));
  return mheap_elt_data_bytes (e);
#else
  ASSERT (clib_mem_is_heap_object (p));
  return mspace_usable_size_with_delta (p);
#endif
}

always_inline void *
clib_mem_get_heap (void)
{
  return clib_mem_get_per_cpu_heap ();
}

always_inline void *
clib_mem_set_heap (void *heap)
{
  return clib_mem_set_per_cpu_heap (heap);
}

void *clib_mem_init (void *heap, uword size);
void *clib_mem_init_thread_safe (void *memory, uword memory_size);

void clib_mem_exit (void);

uword clib_mem_get_page_size (void);

void clib_mem_validate (void);

void clib_mem_trace (int enable);

typedef struct
{
  /* Total number of objects allocated. */
  uword object_count;

  /* Total allocated bytes.  Bytes used and free.
     used + free = total */
  uword bytes_total, bytes_used, bytes_free;

  /* Number of bytes used by mheap data structure overhead
     (e.g. free lists, mheap header). */
  uword bytes_overhead;

  /* Amount of free space returned to operating system. */
  uword bytes_free_reclaimed;

  /* For malloc which puts small objects in sbrk region and
     large objects in mmap'ed regions. */
  uword bytes_used_sbrk;
  uword bytes_used_mmap;

  /* Max. number of bytes in this heap. */
  uword bytes_max;
} clib_mem_usage_t;

void clib_mem_usage (clib_mem_usage_t * usage);

u8 *format_clib_mem_usage (u8 * s, va_list * args);

/* Allocate virtual address space. */
always_inline void *
clib_mem_vm_alloc (uword size)
{
  void *mmap_addr;
  uword flags = MAP_PRIVATE;

#ifdef MAP_ANONYMOUS
  flags |= MAP_ANONYMOUS;
#endif

  mmap_addr = mmap (0, size, PROT_READ | PROT_WRITE, flags, -1, 0);
  if (mmap_addr == (void *) -1)
    mmap_addr = 0;

  return mmap_addr;
}

always_inline void
clib_mem_vm_free (void *addr, uword size)
{
  munmap (addr, size);
}

always_inline void *
clib_mem_vm_unmap (void *addr, uword size)
{
  void *mmap_addr;
  uword flags = MAP_PRIVATE | MAP_FIXED;

  /* To unmap we "map" with no protection.  If we actually called
     munmap then other callers could steal the address space.  By
     changing to PROT_NONE the kernel can free up the pages which is
     really what we want "unmap" to mean. */
  mmap_addr = mmap (addr, size, PROT_NONE, flags, -1, 0);
  if (mmap_addr == (void *) -1)
    mmap_addr = 0;

  return mmap_addr;
}

always_inline void *
clib_mem_vm_map (void *addr, uword size)
{
  void *mmap_addr;
  uword flags = MAP_PRIVATE | MAP_FIXED | MAP_ANONYMOUS;

  mmap_addr = mmap (addr, size, (PROT_READ | PROT_WRITE), flags, -1, 0);
  if (mmap_addr == (void *) -1)
    mmap_addr = 0;

  return mmap_addr;
}

typedef struct
{
#define CLIB_MEM_VM_F_SHARED (1 << 0)
#define CLIB_MEM_VM_F_HUGETLB (1 << 1)
#define CLIB_MEM_VM_F_NUMA_PREFER (1 << 2)
#define CLIB_MEM_VM_F_NUMA_FORCE (1 << 3)
#define CLIB_MEM_VM_F_HUGETLB_PREALLOC (1 << 4)
#define CLIB_MEM_VM_F_LOCKED (1 << 5)
  u32 flags; /**< vm allocation flags:
                <br> CLIB_MEM_VM_F_SHARED: request shared memory, file
                descriptor will be provided on successful allocation.
                <br> CLIB_MEM_VM_F_HUGETLB: request hugepages.
                <br> CLIB_MEM_VM_F_NUMA_PREFER: numa_node field contains valid
                numa node preference.
                <br> CLIB_MEM_VM_F_NUMA_FORCE: fail if setting numa policy fails.
                <br> CLIB_MEM_VM_F_HUGETLB_PREALLOC: pre-allocate hugepages if
                number of available pages is not sufficient.
                <br> CLIB_MEM_VM_F_LOCKED: request locked memory.
             */
  char *name; /**< Name for memory allocation, set by caller. */
  uword size; /**< Allocation size, set by caller. */
  int numa_node; /**< numa node preference. Valid if CLIB_MEM_VM_F_NUMA_PREFER set. */
  void *addr; /**< Pointer to allocated memory, set on successful allocation. */
  int fd; /**< File descriptor, set on successful allocation if CLIB_MEM_VM_F_SHARED is set. */
  int log2_page_size;           /* Page size in log2 format, set on successful allocation. */
  int n_pages;                  /* Number of pages. */
  uword requested_va;           /**< Request fixed position mapping */
} clib_mem_vm_alloc_t;

clib_error_t *clib_mem_vm_ext_alloc (clib_mem_vm_alloc_t * a);
u64 clib_mem_vm_get_page_size (int fd);
int clib_mem_vm_get_log2_page_size (int fd);
u64 *clib_mem_vm_get_paddr (void *mem, int log2_page_size, int n_pages);

typedef struct
{
  uword size;           /**< Map size */
  int fd;               /**< File descriptor to be mapped */
  uword requested_va;   /**< Request fixed position mapping */
  void *addr;           /**< Pointer to mapped memory, if successful */
} clib_mem_vm_map_t;

clib_error_t *clib_mem_vm_ext_map (clib_mem_vm_map_t * a);
void clib_mem_vm_randomize_va (uword * requested_va, u32 log2_page_size);
void mheap_trace (void *v, int enable);

#include <vppinfra/error.h>     /* clib_panic */

#endif /* _included_clib_mem_h */

/*
 * fd.io coding-style-patch-verification: ON
 *
 * Local Variables:
 * eval: (c-set-style "gnu")
 * End:
 */