arch/sparc/include/asm/mdesc.h

   1 #ifndef _SPARC64_MDESC_H
   2 #define _SPARC64_MDESC_H
   3
   4 #include <linux/types.h>
   5 #include <linux/cpumask.h>
   6 #include <asm/prom.h>
   7
   8 struct mdesc_handle;
   9
  10 /* Machine description operations are to be surrounded by grab and
  11  * release calls.  The mdesc_handle returned from the grab is
  12  * the first argument to all of the operational calls that work
  13  * on mdescs.
  14  */
  15 extern struct mdesc_handle *mdesc_grab(void);
  16 extern void mdesc_release(struct mdesc_handle *);
  17
  18 #define MDESC_NODE_NULL         (~(u64)0)
  19
  20 extern u64 mdesc_node_by_name(struct mdesc_handle *handle,
  21                               u64 from_node, const char *name);
  22 #define mdesc_for_each_node_by_name(__hdl, __node, __name) \
  23         for (__node = mdesc_node_by_name(__hdl, MDESC_NODE_NULL, __name); \
  24              (__node) != MDESC_NODE_NULL; \
  25              __node = mdesc_node_by_name(__hdl, __node, __name))
  26
  27 /* Access to property values returned from mdesc_get_property() are
  28  * only valid inside of a mdesc_grab()/mdesc_release() sequence.
  29  * Once mdesc_release() is called, the memory backed up by these
  30  * pointers may reference freed up memory.
  31  *
  32  * Therefore callers must make copies of any property values
  33  * they need.
  34  *
  35  * These same rules apply to mdesc_node_name().
  36  */
  37 extern const void *mdesc_get_property(struct mdesc_handle *handle,
  38                                       u64 node, const char *name, int *lenp);
  39 extern const char *mdesc_node_name(struct mdesc_handle *hp, u64 node);
  40
  41 /* MD arc iteration, the standard sequence is:
  42  *
  43  *      unsigned long arc;
  44  *      mdesc_for_each_arc(arc, handle, node, MDESC_ARC_TYPE_{FWD,BACK}) {
  45  *              unsigned long target = mdesc_arc_target(handle, arc);
  46  *              ...
  47  *      }
  48  */
  49
  50 #define MDESC_ARC_TYPE_FWD      "fwd"
  51 #define MDESC_ARC_TYPE_BACK     "back"
  52
  53 extern u64 mdesc_next_arc(struct mdesc_handle *handle, u64 from,
  54                           const char *arc_type);
  55 #define mdesc_for_each_arc(__arc, __hdl, __node, __type) \
  56         for (__arc = mdesc_next_arc(__hdl, __node, __type); \
  57              (__arc) != MDESC_NODE_NULL; \
  58              __arc = mdesc_next_arc(__hdl, __arc, __type))
  59
  60 extern u64 mdesc_arc_target(struct mdesc_handle *hp, u64 arc);
  61
  62 extern void mdesc_update(void);
  63
  64 struct mdesc_notifier_client {
  65         void (*add)(struct mdesc_handle *handle, u64 node);
  66         void (*remove)(struct mdesc_handle *handle, u64 node);
  67
  68         const char                      *node_name;
  69         struct mdesc_notifier_client    *next;
  70 };
  71
  72 extern void mdesc_register_notifier(struct mdesc_notifier_client *client);
  73
  74 extern void mdesc_fill_in_cpu_data(cpumask_t *mask);
  75 extern void mdesc_populate_present_mask(cpumask_t *mask);
  76
  77 extern void sun4v_mdesc_init(void);
  78
  79 #endif