plugins.h

/*
 * Copyright © 2013 Inria.  All rights reserved.
 * See COPYING in top-level directory.
 */

#ifndef HWLOC_PLUGINS_H
#define HWLOC_PLUGINS_H

struct hwloc_backend;

#include <hwloc.h>
#ifdef HWLOC_INSIDE_PLUGIN
/* needed for hwloc_plugin_check_namespace() */
#include <ltdl.h>
#endif



typedef enum hwloc_disc_component_type_e {
  HWLOC_DISC_COMPONENT_TYPE_CPU = (1<<0),

  HWLOC_DISC_COMPONENT_TYPE_GLOBAL = (1<<1),

  HWLOC_DISC_COMPONENT_TYPE_MISC = (1<<2)
} hwloc_disc_component_type_t;

struct hwloc_disc_component {
  hwloc_disc_component_type_t type;

  const char *name;

  unsigned excludes;

  struct hwloc_backend * (*instantiate)(struct hwloc_disc_component *component, const void *data1, const void *data2, const void *data3);

  unsigned priority;

  struct hwloc_disc_component * next;
};

struct hwloc_backend {
  struct hwloc_disc_component * component;
  struct hwloc_topology * topology;
  int envvar_forced;
  struct hwloc_backend * next;

  unsigned long flags;

  int is_custom;

  int is_thissystem;

  void * private_data;
  void (*disable)(struct hwloc_backend *backend);

  int (*discover)(struct hwloc_backend *backend);

  int (*get_obj_cpuset)(struct hwloc_backend *backend, struct hwloc_backend *caller, struct hwloc_obj *obj, hwloc_bitmap_t cpuset);

  int (*notify_new_object)(struct hwloc_backend *backend, struct hwloc_backend *caller, struct hwloc_obj *obj);
};

enum hwloc_backend_flag_e {
  HWLOC_BACKEND_FLAG_NEED_LEVELS = (1UL<<0)
};

HWLOC_DECLSPEC struct hwloc_backend * hwloc_backend_alloc(struct hwloc_disc_component *component);

HWLOC_DECLSPEC int hwloc_backend_enable(struct hwloc_topology *topology, struct hwloc_backend *backend);

HWLOC_DECLSPEC int hwloc_backends_get_obj_cpuset(struct hwloc_backend *caller, struct hwloc_obj *obj, hwloc_bitmap_t cpuset);

HWLOC_DECLSPEC int hwloc_backends_notify_new_object(struct hwloc_backend *caller, struct hwloc_obj *obj);

typedef enum hwloc_component_type_e {
  HWLOC_COMPONENT_TYPE_DISC,

  HWLOC_COMPONENT_TYPE_XML
} hwloc_component_type_t;

struct hwloc_component {
  unsigned abi;

  hwloc_component_type_t type;

  unsigned long flags;

  void * data;
};

HWLOC_DECLSPEC struct hwloc_obj *hwloc_insert_object_by_cpuset(struct hwloc_topology *topology, hwloc_obj_t obj);

typedef void (*hwloc_report_error_t)(const char * msg, int line);
HWLOC_DECLSPEC void hwloc_report_os_error(const char * msg, int line);
HWLOC_DECLSPEC int hwloc_hide_errors(void);

HWLOC_DECLSPEC struct hwloc_obj *hwloc__insert_object_by_cpuset(struct hwloc_topology *topology, hwloc_obj_t obj, hwloc_report_error_t report_error);

HWLOC_DECLSPEC void hwloc_insert_object_by_parent(struct hwloc_topology *topology, hwloc_obj_t parent, hwloc_obj_t obj);

static __hwloc_inline struct hwloc_obj *
hwloc_alloc_setup_object(hwloc_obj_type_t type, signed os_index)
{
  struct hwloc_obj *obj = malloc(sizeof(*obj));
  memset(obj, 0, sizeof(*obj));
  obj->type = type;
  obj->os_index = os_index;
  obj->os_level = -1;
  obj->attr = malloc(sizeof(*obj->attr));
  memset(obj->attr, 0, sizeof(*obj->attr));
  /* do not allocate the cpuset here, let the caller do it */
  return obj;
}

HWLOC_DECLSPEC int hwloc_fill_object_sets(hwloc_obj_t obj);

HWLOC_DECLSPEC int hwloc_insert_pci_device_list(struct hwloc_backend *backend, struct hwloc_obj *first_obj);

HWLOC_DECLSPEC unsigned hwloc_pci_find_cap(const unsigned char *config, unsigned cap);

HWLOC_DECLSPEC int hwloc_pci_find_linkspeed(const unsigned char *config, unsigned offset, float *linkspeed);

HWLOC_DECLSPEC int hwloc_pci_prepare_bridge(hwloc_obj_t obj, const unsigned char *config);

static __hwloc_inline int
hwloc_plugin_check_namespace(const char *pluginname __hwloc_attribute_unused, const char *symbol __hwloc_attribute_unused)
{
#ifdef HWLOC_INSIDE_PLUGIN
  lt_dlhandle handle;
  void *sym;
  handle = lt_dlopen(NULL);
  if (!handle)
    /* cannot check, assume things will work */
    return 0;
  sym = lt_dlsym(handle, symbol);
  lt_dlclose(handle);
  if (!sym) {
    static int verboseenv_checked = 0;
    static int verboseenv_value = 0;
    if (!verboseenv_checked) {
      char *verboseenv = getenv("HWLOC_PLUGINS_VERBOSE");
      verboseenv_value = atoi(verboseenv);
      verboseenv_checked = 1;
    }
    if (verboseenv_value)
      fprintf(stderr, "Plugin `%s' disabling itself because it cannot find the `%s' core symbol.\n",
              pluginname, symbol);
    return -1;
  }
#endif /* HWLOC_INSIDE_PLUGIN */
  return 0;
}

#endif /* HWLOC_PLUGINS_H */