/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _SPARC64_MDESC_H
#define _SPARC64_MDESC_H

#include <linux/types.h>
#include <linux/cpumask.h>
#include <asm/prom.h>

struct mdesc_handle;

/* Machine description operations are to be surrounded by grab and
 * release calls.  The mdesc_handle returned from the grab is
 * the first argument to all of the operational calls that work
 * on mdescs.
 */
struct mdesc_handle *mdesc_grab(void);
void mdesc_release(struct mdesc_handle *);

#define MDESC_NODE_NULL         (~(u64)0)
#define MDESC_MAX_STR_LEN       256

u64 mdesc_node_by_name(struct mdesc_handle *handle,
                       u64 from_node, const char *name);
#define mdesc_for_each_node_by_name(__hdl, __node, __name) \
        for (__node = mdesc_node_by_name(__hdl, MDESC_NODE_NULL, __name); \
             (__node) != MDESC_NODE_NULL; \
             __node = mdesc_node_by_name(__hdl, __node, __name))

/* Access to property values returned from mdesc_get_property() are
 * only valid inside of a mdesc_grab()/mdesc_release() sequence.
 * Once mdesc_release() is called, the memory backed up by these
 * pointers may reference freed up memory.
 *
 * Therefore callers must make copies of any property values
 * they need.
 *
 * These same rules apply to mdesc_node_name().
 */
const void *mdesc_get_property(struct mdesc_handle *handle,
                               u64 node, const char *name, int *lenp);
const char *mdesc_node_name(struct mdesc_handle *hp, u64 node);

/* MD arc iteration, the standard sequence is:
 *
 *      unsigned long arc;
 *      mdesc_for_each_arc(arc, handle, node, MDESC_ARC_TYPE_{FWD,BACK}) {
 *              unsigned long target = mdesc_arc_target(handle, arc);
 *              ...
 *      }
 */

#define MDESC_ARC_TYPE_FWD      "fwd"
#define MDESC_ARC_TYPE_BACK     "back"

u64 mdesc_next_arc(struct mdesc_handle *handle, u64 from,
                   const char *arc_type);
#define mdesc_for_each_arc(__arc, __hdl, __node, __type) \
        for (__arc = mdesc_next_arc(__hdl, __node, __type); \
             (__arc) != MDESC_NODE_NULL; \
             __arc = mdesc_next_arc(__hdl, __arc, __type))

u64 mdesc_arc_target(struct mdesc_handle *hp, u64 arc);

void mdesc_update(void);

struct mdesc_notifier_client {
        void (*add)(struct mdesc_handle *handle, u64 node,
                    const char *node_name);
        void (*remove)(struct mdesc_handle *handle, u64 node,
                       const char *node_name);
        const char                      *node_name;
        struct mdesc_notifier_client    *next;
};

void mdesc_register_notifier(struct mdesc_notifier_client *client);

union md_node_info {
        struct vdev_port {
                u64 id;                         /* id */
                u64 parent_cfg_hdl;             /* parent config handle */
                const char *name;               /* name (property) */
        } vdev_port;
        struct ds_port {
                u64 id;                         /* id */
        } ds_port;
};

u64 mdesc_get_node(struct mdesc_handle *hp, const char *node_name,
                   union md_node_info *node_info);
int mdesc_get_node_info(struct mdesc_handle *hp, u64 node,
                        const char *node_name, union md_node_info *node_info);

void mdesc_fill_in_cpu_data(cpumask_t *mask);
void mdesc_populate_present_mask(cpumask_t *mask);
void mdesc_get_page_sizes(cpumask_t *mask, unsigned long *pgsz_mask);

void sun4v_mdesc_init(void);

#endif