深入浅出思科VPP24.02系列：内存初始化vlib_physmem_init逻辑介绍

clib_error_t *
vlib_physmem_init (vlib_main_t * vm)
{
  vlib_physmem_main_t *vpm = &vm->physmem_main;
  clib_error_t *error = 0;
  u64 *pt = 0;
  void *p;

  /* check if pagemap is accessible */
  pt = clib_mem_vm_get_paddr (&pt, min_log2 (sysconf (_SC_PAGESIZE)), 1);
  if (pt && pt[0])
    vpm->flags |= VLIB_PHYSMEM_MAIN_F_HAVE_PAGEMAP;
  vec_free (pt);

#ifdef __linux__
  if ((error = linux_vfio_init (vm)))
    return error;
#endif /* __linux__ */

  p = clib_mem_alloc_aligned (sizeof (clib_pmalloc_main_t),
            CLIB_CACHE_LINE_BYTES);
  memset (p, 0, sizeof (clib_pmalloc_main_t));
  vpm->pmalloc_main = (clib_pmalloc_main_t *) p;

  if (vpm->base_addr == 0)
    vpm->base_addr = VLIB_PHYSMEM_DEFAULT_BASE_ADDDR;

  clib_pmalloc_init (vpm->pmalloc_main, vpm->base_addr, vpm->max_size);

  /* update base_addr and max_size per actual allocation */
  vpm->base_addr = (uword) vpm->pmalloc_main->base;
  vpm->max_size = (uword) vpm->pmalloc_main->max_pages <<
    vpm->pmalloc_main->def_log2_page_sz;

  return error;
}

vlib_physmem_main_t *vpm = &vm->physmem_main;
typedef struct
{
  u32 flags;
  uword base_addr;
  uword max_size;
#define VLIB_PHYSMEM_MAIN_F_HAVE_PAGEMAP  (1 << 0)
#define VLIB_PHYSMEM_MAIN_F_HAVE_IOMMU    (1 << 1)
  vlib_physmem_map_t *maps;
  clib_pmalloc_main_t *pmalloc_main;
} vlib_physmem_main_t;

  /* check if pagemap is accessible */
  pt = clib_mem_vm_get_paddr (&pt, min_log2 (sysconf (_SC_PAGESIZE)), 1);
  if (pt && pt[0])
    vpm->flags |= VLIB_PHYSMEM_MAIN_F_HAVE_PAGEMAP;
  vec_free (pt);

#ifdef __linux__
  if ((error = linux_vfio_init (vm)))
    return error;
#endif /* __linux__ */

  p = clib_mem_alloc_aligned (sizeof (clib_pmalloc_main_t),
            CLIB_CACHE_LINE_BYTES);
  memset (p, 0, sizeof (clib_pmalloc_main_t));

 vpm->pmalloc_main = (clib_pmalloc_main_t *) p;

  if (vpm->base_addr == 0)
    vpm->base_addr = VLIB_PHYSMEM_DEFAULT_BASE_ADDDR;

  clib_pmalloc_init (vpm->pmalloc_main, vpm->base_addr, vpm->max_size);

  /* update base_addr and max_size per actual allocation */
  vpm->base_addr = (uword) vpm->pmalloc_main->base;
  vpm->max_size = (uword) vpm->pmalloc_main->max_pages <<
    vpm->pmalloc_main->def_log2_page_sz;

static clib_error_t *
show_physmem (vlib_main_t * vm,
        unformat_input_t * input, vlib_cli_command_t * cmd)
{
  vlib_physmem_main_t *vpm = &vm->physmem_main;
  unformat_input_t _line_input, *line_input = &_line_input;
  u32 verbose = 0, map = 0;

  if (unformat_user (input, unformat_line_input, line_input))
    {
      while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
  {
    if (unformat (line_input, "verbose"))
      verbose = 1;
    else if (unformat (line_input, "v"))
      verbose = 1;
    else if (unformat (line_input, "detail"))
      verbose = 2;
    else if (unformat (line_input, "d"))
      verbose = 2;
    else if (unformat (line_input, "map"))
      map = 1;
    else
      break;
  }
      unformat_free (line_input);
    }

  if (map)
    vlib_cli_output (vm, " %U", format_pmalloc_map, vpm->pmalloc_main);
  else
    vlib_cli_output (vm, " %U", format_pmalloc, vpm->pmalloc_main, verbose);

  return 0;
}

VLIB_CLI_COMMAND (show_physmem_command, static) = {
  .path = "show physmem",
  .short_help = "show physmem [verbose | detail | map]",
  .function = show_physmem,
};