arch/sparc/include/asm/mdesc.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _SPARC64_MDESC_H
   3 #define _SPARC64_MDESC_H
   4
   5 #include <linux/types.h>
   6 #include <linux/cpumask.h>
   7 #include <asm/prom.h>
   8
   9 struct mdesc_handle;
  10
  11 /* Machine description operations are to be surrounded by grab and
  12  * release calls.  The mdesc_handle returned from the grab is
  13  * the first argument to all of the operational calls that work
  14  * on mdescs.
  15  */
  16 struct mdesc_handle *mdesc_grab(void);
  17 void mdesc_release(struct mdesc_handle *);
  18
  19 #define MDESC_NODE_NULL         (~(u64)0)
  20 #define MDESC_MAX_STR_LEN       256
  21
  22 u64 mdesc_node_by_name(struct mdesc_handle *handle,
  23                        u64 from_node, const char *name);
  24 #define mdesc_for_each_node_by_name(__hdl, __node, __name) \
  25         for (__node = mdesc_node_by_name(__hdl, MDESC_NODE_NULL, __name); \
  26              (__node) != MDESC_NODE_NULL; \
  27              __node = mdesc_node_by_name(__hdl, __node, __name))
  28
  29 /* Access to property values returned from mdesc_get_property() are
  30  * only valid inside of a mdesc_grab()/mdesc_release() sequence.
  31  * Once mdesc_release() is called, the memory backed up by these
  32  * pointers may reference freed up memory.
  33  *
  34  * Therefore callers must make copies of any property values
  35  * they need.
  36  *
  37  * These same rules apply to mdesc_node_name().
  38  */
  39 const void *mdesc_get_property(struct mdesc_handle *handle,
  40                                u64 node, const char *name, int *lenp);
  41 const char *mdesc_node_name(struct mdesc_handle *hp, u64 node);
  42
  43 /* MD arc iteration, the standard sequence is:
  44  *
  45  *      unsigned long arc;
  46  *      mdesc_for_each_arc(arc, handle, node, MDESC_ARC_TYPE_{FWD,BACK}) {
  47  *              unsigned long target = mdesc_arc_target(handle, arc);
  48  *              ...
  49  *      }
  50  */
  51
  52 #define MDESC_ARC_TYPE_FWD      "fwd"
  53 #define MDESC_ARC_TYPE_BACK     "back"
  54
  55 u64 mdesc_next_arc(struct mdesc_handle *handle, u64 from,
  56                    const char *arc_type);
  57 #define mdesc_for_each_arc(__arc, __hdl, __node, __type) \
  58         for (__arc = mdesc_next_arc(__hdl, __node, __type); \
  59              (__arc) != MDESC_NODE_NULL; \
  60              __arc = mdesc_next_arc(__hdl, __arc, __type))
  61
  62 u64 mdesc_arc_target(struct mdesc_handle *hp, u64 arc);
  63
  64 void mdesc_update(void);
  65
  66 struct mdesc_notifier_client {
  67         void (*add)(struct mdesc_handle *handle, u64 node,
  68                     const char *node_name);
  69         void (*remove)(struct mdesc_handle *handle, u64 node,
  70                        const char *node_name);
  71         const char                      *node_name;
  72         struct mdesc_notifier_client    *next;
  73 };
  74
  75 void mdesc_register_notifier(struct mdesc_notifier_client *client);
  76
  77 union md_node_info {
  78         struct vdev_port {
  79                 u64 id;                         /* id */
  80                 u64 parent_cfg_hdl;             /* parent config handle */
  81                 const char *name;               /* name (property) */
  82         } vdev_port;
  83         struct ds_port {
  84                 u64 id;                         /* id */
  85         } ds_port;
  86 };
  87
  88 u64 mdesc_get_node(struct mdesc_handle *hp, const char *node_name,
  89                    union md_node_info *node_info);
  90 int mdesc_get_node_info(struct mdesc_handle *hp, u64 node,
  91                         const char *node_name, union md_node_info *node_info);
  92
  93 void mdesc_fill_in_cpu_data(cpumask_t *mask);
  94 void mdesc_populate_present_mask(cpumask_t *mask);
  95 void mdesc_get_page_sizes(cpumask_t *mask, unsigned long *pgsz_mask);
  96
  97 void sun4v_mdesc_init(void);
  98
  99 #endif